381 lines
16 KiB
C
381 lines
16 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef _DTB_NODE_H__
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#define _DTB_NODE_H__
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#include "libfdt_env.h"
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#include <rtthread.h>
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#include <stdint.h>
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//#define RT_DTB_DEBUG
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#ifdef RT_DTB_DEBUG
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#define debug(fmt, args...) rt_kprintf(fmt, ##args)
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#else
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#define debug(fmt, args...)
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#endif
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#define ERR_PTR(err) ((void *)((long)(err)))
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#define PTR_ERR(ptr) ((long)(ptr))
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#define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
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#define DEV_ROOT_NODE_ADDR_CELLS_DEFAULT 2
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#define DEV_ROOT_NODE_SIZE_CELLS_DEFAULT 1
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/* will be optimized to only u64 or u32 by gcc */
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#define IN_64BITS_MODE (sizeof(void *) == 8)
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#define FDT_ROOT_ADDR_CELLS_DEFAULT 1
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#define FDT_ROOT_SIZE_CELLS_DEFAULT 1
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#define FDT_DTB_ALL_NODES_PATH_SIZE (32 * 1024)
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#define FDT_DTB_PAD_SIZE 1024
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#define FDT_RET_NO_MEMORY 2
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#define FDT_RET_NO_LOADED 1
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#define FDT_RET_GET_OK 0
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#define FDT_RET_GET_EMPTY (-1)
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typedef uint32_t phandle;
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struct dtb_memreserve
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{
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uintptr_t address;
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size_t size;
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};
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struct dtb_header
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{
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char root, zero; /* "/" */
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struct dtb_memreserve *memreserve;
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size_t memreserve_sz;
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};
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struct dtb_property
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{
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const char *name;
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int size;
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void *value;
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struct dtb_property *next;
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};
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struct dtb_node
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{
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union
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{
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const char *name;
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const struct dtb_header *header;
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};
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const char *path;
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phandle handle;
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struct dtb_property *properties;
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struct dtb_node *parent;
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struct dtb_node *child;
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struct dtb_node *sibling;
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};
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#define FDT_MAX_PHANDLE_ARGS 16
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/**
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* struct dtb_node_phandle_args - structure to hold phandle and arguments
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*
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* This is used when decoding a phandle in a device tree property. Typically
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* these look like this:
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*
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* wibble {
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* phandle = <5>;
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* };
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*
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* ...
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* some-prop = <&wibble 1 2 3>
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*
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* Here &node is the phandle of the node 'wibble', i.e. 5. There are three
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* arguments: 1, 2, 3.
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*
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* So when decoding the phandle in some-prop, np will point to wibble,
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* args_count will be 3 and the three arguments will be in args.
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*
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* @np: Node that the phandle refers to
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* @args_count: Number of arguments
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* @args: Argument values
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*/
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struct fdt_phandle_args
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{
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struct dtb_node *np;
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int args_count;
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uint32_t args[FDT_MAX_PHANDLE_ARGS];
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};
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/*
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* A single signal can be specified via a range of minimal and maximal values
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* with a typical value, that lies somewhere inbetween.
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*/
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struct timing_entry
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{
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uint32_t min;
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uint32_t typ;
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uint32_t max;
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};
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void *get_fdt_blob(void);
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struct dtb_node *get_dtb_node_head(void);
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rt_bool_t dtb_node_active(void);
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int device_tree_setup(void *mem_addr);
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void *dtb_node_load_from_fs(char *dtb_filename);
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void *dtb_node_load_from_memory(void *dtb_ptr, rt_bool_t is_clone);
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size_t dtb_node_set_linux_cmdline(void *fdt, char *cmdline);
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size_t dtb_node_set_linux_initrd(void *fdt, uint64_t initrd_addr, size_t initrd_size);
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size_t dtb_node_set_dtb_property(void *fdt, char *pathname, char *property_name, uint32_t *cells, size_t cells_size);
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size_t dtb_node_add_dtb_memreserve(void *fdt, uint64_t address, uint64_t size);
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size_t dtb_node_del_dtb_memreserve(void *fdt, uint64_t address);
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int dtb_node_get_exec_status();
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struct dtb_node *dtb_node_get_dtb_list(void *fdt);
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void dtb_node_free_dtb_list(struct dtb_node *dtb_node_head);
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void dtb_node_get_dts_dump(struct dtb_node *dtb_node_head);
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void dtb_node_get_enum_dtb_node(struct dtb_node *dtb_node_head, void(callback(struct dtb_node *dtb_node)));
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struct dtb_node *dtb_node_get_dtb_node_by_name_DFS(struct dtb_node *dtb_node, const char *nodename);
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struct dtb_node *dtb_node_get_dtb_node_by_name_BFS(struct dtb_node *dtb_node, const char *nodename);
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struct dtb_node *dtb_node_get_dtb_node_by_path(struct dtb_node *dtb_node, const char *pathname);
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struct dtb_node *dtb_node_get_dtb_node_by_phandle_DFS(struct dtb_node *dtb_node, phandle handle);
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struct dtb_node *dtb_node_get_dtb_node_by_phandle_BFS(struct dtb_node *dtb_node, phandle handle);
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void dtb_node_get_dtb_node_cells(struct dtb_node *dtb_node, int *addr_cells, int *size_cells);
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struct dtb_memreserve *dtb_node_get_dtb_memreserve(struct dtb_node *dtb_node, int *memreserve_size);
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uint8_t dtb_node_get_dtb_byte_value(void *value);
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char *dtb_node_get_dtb_string_list_value(void *value, int size, int index);
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char *dtb_node_get_dtb_string_list_value_next(void *value, void *end);
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uint32_t dtb_node_get_dtb_cell_value(void *value);
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rt_bool_t dtb_node_get_dtb_node_status(const struct dtb_node *dtb_node);
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rt_bool_t dtb_node_get_dtb_node_compatible_match(const struct dtb_node *dtb_node, const char *compatibles);
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/*dtb_node_access.c */
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int dtb_node_read_u32(const struct dtb_node *dn, const char *propname, uint32_t *outp);
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uint32_t dtb_node_read_u32_default(const struct dtb_node *node, const char *propname, uint32_t def);
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int dtb_node_read_u32_index(const struct dtb_node *node, const char *propname, int index,
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uint32_t *outp);
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uint32_t dtb_node_read_u32_index_default(const struct dtb_node *node, const char *propname, int index,
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uint32_t def);
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int dtb_node_read_u32_array(const struct dtb_node *dn, const char *propname,
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uint32_t *out_values, size_t sz);
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int dtb_node_read_u32_index(const struct dtb_node *dn, const char *propname,
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int index, uint32_t *outp);
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int dtb_node_read_s32_default(const struct dtb_node *node, const char *propname, int32_t def);
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int dtb_node_read_u64(const struct dtb_node *dn, const char *propname, uint64_t *outp);
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uint64_t dtb_node_read_u64_default(const struct dtb_node *node, const char *propname, uint64_t def);
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int dtb_node_n_addr_cells(const struct dtb_node *dn);
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int dtb_node_n_size_cells(const struct dtb_node *dn);
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int dtb_node_simple_addr_cells(const struct dtb_node *np);
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int dtb_node_simple_size_cells(const struct dtb_node *np);
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struct dtb_node *dtb_node_find_all_nodes(const struct dtb_node *prev);
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struct dtb_node *dtb_node_find_node_by_phandle(phandle handle);
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struct dtb_node *dtb_node_find_compatible_node(struct dtb_node *from, const char *compatible);
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void *dtb_node_get_dtb_node_property_value(const struct dtb_node *dtb_node, const char *property_name, int *property_size);
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struct dtb_property *dtb_node_get_dtb_node_property(const struct dtb_node *dtb_node, const char *property_name, int *property_size);
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const struct dtb_node *dtb_node_find_node_by_prop_value(struct dtb_node *from, const char *propname, const void *propval, int proplen);
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struct dtb_node *dtb_node_find_node_opts_by_path(const char *path,
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const char **opts);
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static inline struct dtb_node *dtb_node_find_node_by_path(const char *path)
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{
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return dtb_node_find_node_opts_by_path(path, NULL);
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}
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rt_bool_t dtb_node_device_is_available(const struct dtb_node *device);
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struct dtb_node *dtb_node_get_parent(const struct dtb_node *node);
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int dtb_node_property_match_string(const struct dtb_node *dn, const char *propname,
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const char *string);
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int dtb_node_property_read_string_helper(const struct dtb_node *dn,
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const char *propname, const char **out_strs,
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size_t sz, int skip);
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/**
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* of_property_read_string_index() - Find and read a string from a multiple
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* strings property.
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @index: index of the string in the list of strings
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* @out_string: pointer to null terminated return string, modified only if
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* return value is 0.
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*
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* Search for a property in a device tree node and retrieve a null
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* terminated string value (pointer to data, not a copy) in the list of strings
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* contained in that property.
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* Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
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* property does not have a value, and -EILSEQ if the string is not
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* null-terminated within the length of the property data.
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*
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* The out_string pointer is modified only if a valid string can be decoded.
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*/
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static inline int dtb_node_property_read_string_index(const struct dtb_node *dn,
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const char *propname,
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int index, const char **output)
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{
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int rc = dtb_node_property_read_string_helper(dn, propname, output, 1, index);
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return rc < 0 ? rc : 0;
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}
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/**
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* of_property_count_strings() - Find and return the number of strings from a
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* multiple strings property.
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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*
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* Search for a property in a device tree node and retrieve the number of null
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* terminated string contain in it. Returns the number of strings on
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* success, -EINVAL if the property does not exist, -ENODATA if property
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* does not have a value, and -EILSEQ if the string is not null-terminated
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* within the length of the property data.
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*/
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static inline int dtb_node_property_count_strings(const struct dtb_node *dn,
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const char *propname)
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{
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return dtb_node_property_read_string_helper(dn, propname, NULL, 0, 0);
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}
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struct dtb_node *dtb_node_parse_phandle(const struct dtb_node *dn,
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const char *phandle_name, int index);
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int dtb_node_parse_phandle_with_args(const struct dtb_node *dn,
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const char *list_name, const char *cells_name,
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int index, struct fdt_phandle_args *out_args);
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int dtb_node_count_phandle_with_args(const struct dtb_node *dn,
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const char *list_name, const char *cells_name);
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/* dtb_node_addr.c */
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const uint32_t *dtb_node_get_address(const struct dtb_node *dev, int index,
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uint64_t *size, unsigned int *flags);
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#define dtb_node_string_list(string, ...) ((char *[]){string, ##__VA_ARGS__, NULL})
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#define for_each_property_string(node_ptr, property_name, str, size) \
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for (str = dtb_node_get_dtb_node_property_value(node_ptr, property_name, &size), \
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size += (typeof(size))(size_t)str; \
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str && *str; \
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str = dtb_node_get_dtb_string_list_value_next((void *)str, (void *)(size_t)size))
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#define for_each_property_cell(node_ptr, property_name, value, list, size) \
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for (list = dtb_node_get_dtb_node_property_value(node_ptr, property_name, &size), \
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value = dtb_node_get_dtb_cell_value(list), \
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size /= sizeof(uint32_t); \
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size > 0; \
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value = dtb_node_get_dtb_cell_value(++list), --size)
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#define for_each_property_byte(node_ptr, property_name, value, list, size) \
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for (list = dtb_node_get_dtb_node_property_value(node_ptr, property_name, &size), \
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value = dtb_node_get_dtb_byte_value(list); \
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size > 0; \
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value = dtb_node_get_dtb_byte_value(++list), --size)
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#define for_each_node_child(node_ptr) \
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for (node_ptr = (node_ptr ? node_ptr->child : NULL); \
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node_ptr != NULL; \
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node_ptr = node_ptr->sibling)
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#define for_each_node_sibling(node_ptr) \
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for (node_ptr = (node_ptr ? node_ptr->sibling : NULL); \
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node_ptr != NULL; \
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node_ptr = node_ptr->sibling)
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#define for_each_of_allnodes_from(from, dn) \
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for (dn = dtb_node_find_all_nodes(from); dn; dn = dtb_node_find_all_nodes(dn))
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#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
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#define dtb_node_get(x) (x)
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static inline void dtb_node_put(const struct dtb_node *np)
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{
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}
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/* Helper to read a big number; size is in cells (not bytes) */
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static inline uint64_t dtb_node_read_number(const uint32_t *cell, int size)
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{
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uint64_t r = 0;
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while (size--)
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r = (r << 32) | fdt32_to_cpu(*(cell++));
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return r;
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}
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/**
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* ofnode_valid() - check if an ofnode is valid
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*
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* @return true if the reference contains a valid ofnode, RT_FALSE if it is NULL
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*/
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static inline rt_bool_t dtb_node_valid(const struct dtb_node *node)
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{
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if (dtb_node_active())
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return node != NULL;
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return RT_FALSE;
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}
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/*dtb_base.c */
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rt_bool_t dtb_node_read_bool(const struct dtb_node *node, const char *propname);
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const void *dtb_node_read_prop(const struct dtb_node *node, const char *propname, int *sizep);
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const char *dtb_node_read_string(const struct dtb_node *node, const char *propname);
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const struct dtb_node *dtb_node_find_subnode(const struct dtb_node *node, const char *subnode_name);
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int dtb_node_read_u32_array(const struct dtb_node *node, const char *propname,
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uint32_t *out_values, size_t sz);
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struct dtb_node *dtb_node_first_subnode(const struct dtb_node *node);
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struct dtb_node *dtb_node_next_subnode(const struct dtb_node *node);
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struct dtb_node *dtb_node_get_parent(const struct dtb_node *node);
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const char *dtb_node_get_name(const struct dtb_node *node);
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struct dtb_node *dtb_node_get_by_phandle(uint32_t phandle);
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int dtb_node_read_size(const struct dtb_node *node, const char *propname);
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size_t dtb_node_get_addr_index(const struct dtb_node *node, int index);
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size_t dtb_node_get_addr(const struct dtb_node *node);
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int dtb_node_stringlist_search(const struct dtb_node *node, const char *property,
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const char *string);
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int dtb_node_read_string_index(const struct dtb_node *node, const char *property, int index,
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const char **outp);
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int dtb_node_read_string_count(const struct dtb_node *node, const char *property);
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struct dtb_node *dtb_node_path(const char *path);
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const char *dtb_node_get_chosen_prop(const char *name);
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struct dtb_node *dtb_node_get_chosen_node(const char *name);
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const void *dtb_node_get_property(const struct dtb_node *node, const char *propname, int *lenp);
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rt_bool_t dtb_node_is_available(const struct dtb_node *node);
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size_t dtb_node_get_addr_size(const struct dtb_node *node, const char *property,
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size_t *sizep);
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const uint8_t *dtb_node_read_u8_array_ptr(const struct dtb_node *node, const char *propname, size_t sz);
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int dtb_node_find_all_compatible_node(const struct dtb_node *from, const char *compatible, struct dtb_node **node_table, int max_num, int *node_num);
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int dtb_node_write_prop(const struct dtb_node *node, const char *propname, int len,
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const void *value);
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int dtb_node_write_string(const struct dtb_node *node, const char *propname, const char *value);
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int dtb_node_set_enabled(const struct dtb_node *node, rt_bool_t value);
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int dtb_node_irq_get(struct dtb_node *dev, int index);
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int dtb_node_irq_get_byname(struct dtb_node *dev, const char *name);
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int dtb_node_irq_count(struct dtb_node *dev);
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/**
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* dtb_node_for_each_subnode() - iterate over all subnodes of a parent
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*
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* @node: child node (ofnode, lvalue)
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* @parent: parent node (ofnode)
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*
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* This is a wrapper around a for loop and is used like so:
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*
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* ofnode node;
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*
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* dtb_node_for_each_subnode(node, parent) {
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* Use node
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* ...
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* }
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*
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* Note that this is implemented as a macro and @node is used as
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* iterator in the loop. The parent variable can be a constant or even a
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* literal.
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*/
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#define dtb_node_for_each_subnode(node, parent) \
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for (node = dtb_node_first_subnode(parent); \
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dtb_node_valid(node); \
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node = dtb_node_next_subnode(node))
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#endif /* RT_FDT_H__ */
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