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61 lines
2.3 KiB
61 lines
2.3 KiB
/*
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* Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/* Helper functions to offer easier navigation of Device Tree Blob */
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#ifndef FDT_WRAPPERS_H
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#define FDT_WRAPPERS_H
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#include <libfdt_env.h>
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/* Number of cells, given total length in bytes. Each cell is 4 bytes long */
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#define NCELLS(len) ((len) / 4U)
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int fdt_read_uint32(const void *dtb, int node, const char *prop_name,
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uint32_t *value);
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uint32_t fdt_read_uint32_default(const void *dtb, int node,
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const char *prop_name, uint32_t dflt_value);
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int fdt_read_uint64(const void *dtb, int node, const char *prop_name,
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uint64_t *value);
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int fdt_read_uint32_array(const void *dtb, int node, const char *prop_name,
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unsigned int cells, uint32_t *value);
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int fdtw_read_string(const void *dtb, int node, const char *prop,
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char *str, size_t size);
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int fdtw_read_uuid(const void *dtb, int node, const char *prop,
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unsigned int length, uint8_t *uuid);
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int fdtw_write_inplace_cells(void *dtb, int node, const char *prop,
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unsigned int cells, void *value);
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int fdtw_read_bytes(const void *dtb, int node, const char *prop,
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unsigned int length, void *value);
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int fdtw_write_inplace_bytes(void *dtb, int node, const char *prop,
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unsigned int length, const void *data);
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int fdt_get_reg_props_by_index(const void *dtb, int node, int index,
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uintptr_t *base, size_t *size);
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int fdt_get_reg_props_by_name(const void *dtb, int node, const char *name,
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uintptr_t *base, size_t *size);
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int fdt_get_stdout_node_offset(const void *dtb);
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uint64_t fdtw_translate_address(const void *dtb, int bus_node,
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uint64_t base_address);
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int fdtw_for_each_cpu(const void *fdt,
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int (*callback)(const void *dtb, int node, uintptr_t mpidr));
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int fdtw_find_or_add_subnode(void *fdt, int parentoffset, const char *name);
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static inline uint32_t fdt_blob_size(const void *dtb)
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{
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const uint32_t *dtb_header = dtb;
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return fdt32_to_cpu(dtb_header[1]);
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}
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#define fdt_for_each_compatible_node(dtb, node, compatible_str) \
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for (node = fdt_node_offset_by_compatible(dtb, -1, compatible_str); \
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node >= 0; \
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node = fdt_node_offset_by_compatible(dtb, node, compatible_str))
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#endif /* FDT_WRAPPERS_H */
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