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e6a6928c3e
The kernel FDT functions predate libfdt and are much more limited in functionality. Also, the kernel functions and libfdt functions are not compatible with each other because they have different definitions of node offsets. To avoid this incompatibility and in preparation to add more FDT parsing functions which will need libfdt, let's first convert the existing code to use libfdt. The FDT unflattening, top-level FDT scanning, and property retrieval functions are converted to use libfdt. The scanning code should be re-worked to be more efficient and understandable by using libfdt to find nodes directly by path or compatible strings. Signed-off-by: Rob Herring <robh@kernel.org> Tested-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Grant Likely <grant.likely@linaro.org> Tested-by: Stephen Chivers <schivers@csc.com>
130 lines
5 KiB
C
130 lines
5 KiB
C
/*
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* Definitions for working with the Flattened Device Tree data format
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*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#ifndef _LINUX_OF_FDT_H
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#define _LINUX_OF_FDT_H
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#include <linux/types.h>
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#include <linux/init.h>
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/* Definitions used by the flattened device tree */
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#define OF_DT_HEADER 0xd00dfeed /* marker */
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#define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */
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#define OF_DT_END_NODE 0x2 /* End node */
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#define OF_DT_PROP 0x3 /* Property: name off, size,
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* content */
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#define OF_DT_NOP 0x4 /* nop */
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#define OF_DT_END 0x9
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#define OF_DT_VERSION 0x10
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#ifndef __ASSEMBLY__
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/*
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* This is what gets passed to the kernel by prom_init or kexec
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*
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* The dt struct contains the device tree structure, full pathes and
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* property contents. The dt strings contain a separate block with just
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* the strings for the property names, and is fully page aligned and
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* self contained in a page, so that it can be kept around by the kernel,
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* each property name appears only once in this page (cheap compression)
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*
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* the mem_rsvmap contains a map of reserved ranges of physical memory,
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* passing it here instead of in the device-tree itself greatly simplifies
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* the job of everybody. It's just a list of u64 pairs (base/size) that
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* ends when size is 0
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*/
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struct boot_param_header {
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__be32 magic; /* magic word OF_DT_HEADER */
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__be32 totalsize; /* total size of DT block */
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__be32 off_dt_struct; /* offset to structure */
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__be32 off_dt_strings; /* offset to strings */
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__be32 off_mem_rsvmap; /* offset to memory reserve map */
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__be32 version; /* format version */
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__be32 last_comp_version; /* last compatible version */
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/* version 2 fields below */
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__be32 boot_cpuid_phys; /* Physical CPU id we're booting on */
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/* version 3 fields below */
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__be32 dt_strings_size; /* size of the DT strings block */
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/* version 17 fields below */
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__be32 dt_struct_size; /* size of the DT structure block */
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};
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#if defined(CONFIG_OF_FLATTREE)
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struct device_node;
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/* For scanning an arbitrary device-tree at any time */
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extern char *of_fdt_get_string(struct boot_param_header *blob, u32 offset);
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extern void *of_fdt_get_property(struct boot_param_header *blob,
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unsigned long node,
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const char *name,
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int *size);
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extern int of_fdt_is_compatible(struct boot_param_header *blob,
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unsigned long node,
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const char *compat);
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extern int of_fdt_match(struct boot_param_header *blob, unsigned long node,
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const char *const *compat);
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extern void of_fdt_unflatten_tree(unsigned long *blob,
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struct device_node **mynodes);
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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extern int __initdata dt_root_addr_cells;
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extern int __initdata dt_root_size_cells;
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extern struct boot_param_header *initial_boot_params;
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extern char __dtb_start[];
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extern char __dtb_end[];
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/* For scanning the flat device-tree at boot time */
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extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
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int depth, void *data),
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void *data);
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extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
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int *size);
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extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
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extern int of_flat_dt_match(unsigned long node, const char *const *matches);
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extern unsigned long of_get_flat_dt_root(void);
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extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
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int depth, void *data);
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extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
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int depth, void *data);
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extern void early_init_fdt_scan_reserved_mem(void);
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extern void early_init_dt_add_memory_arch(u64 base, u64 size);
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extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
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bool no_map);
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extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
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extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
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/* Early flat tree scan hooks */
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extern int early_init_dt_scan_root(unsigned long node, const char *uname,
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int depth, void *data);
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extern bool early_init_dt_scan(void *params);
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extern const char *of_flat_dt_get_machine_name(void);
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extern const void *of_flat_dt_match_machine(const void *default_match,
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const void * (*get_next_compat)(const char * const**));
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/* Other Prototypes */
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extern void unflatten_device_tree(void);
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extern void unflatten_and_copy_device_tree(void);
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extern void early_init_devtree(void *);
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extern void early_get_first_memblock_info(void *, phys_addr_t *);
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#else /* CONFIG_OF_FLATTREE */
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static inline void early_init_fdt_scan_reserved_mem(void) {}
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static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
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static inline void unflatten_device_tree(void) {}
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static inline void unflatten_and_copy_device_tree(void) {}
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#endif /* CONFIG_OF_FLATTREE */
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_OF_FDT_H */
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