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123 lines
4.7 KiB
123 lines
4.7 KiB
/* |
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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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#ifndef __ASSEMBLY__ |
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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(const void *blob, u32 offset); |
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extern void *of_fdt_get_property(const void *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(const void *blob, |
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unsigned long node, |
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const char *compat); |
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extern bool of_fdt_is_big_endian(const void *blob, |
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unsigned long node); |
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extern int of_fdt_match(const void *blob, unsigned long node, |
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const char *const *compat); |
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extern void of_fdt_unflatten_tree(const 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 void *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 of_get_flat_dt_size(void); |
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/* |
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* early_init_dt_scan_chosen - scan the device tree for ramdisk and bootargs |
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* |
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* The boot arguments will be placed into the memory pointed to by @data. |
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* That memory should be COMMAND_LINE_SIZE big and initialized to be a valid |
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* (possibly empty) string. Logic for what will be in @data after this |
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* function finishes: |
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* |
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* - CONFIG_CMDLINE_FORCE=true |
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* CONFIG_CMDLINE |
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* - CONFIG_CMDLINE_EXTEND=true, @data is non-empty string |
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* @data + dt bootargs (even if dt bootargs are empty) |
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* - CONFIG_CMDLINE_EXTEND=true, @data is empty string |
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* CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty) |
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty: |
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* dt bootargs |
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string |
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* @data is left unchanged |
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string |
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* CONFIG_CMDLINE (or "" if that's not defined) |
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*/ |
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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_fdt_reserve_self(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 bool early_init_dt_verify(void *params); |
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extern void early_init_dt_scan_nodes(void); |
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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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extern u64 fdt_translate_address(const void *blob, int node_offset); |
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extern void of_fdt_limit_memory(int limit); |
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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 void early_init_fdt_reserve_self(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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