1 /* 2 * Definitions for working with the Flattened Device Tree data format 3 * 4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp 5 * benh@kernel.crashing.org 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 */ 11 12 #ifndef _LINUX_OF_FDT_H 13 #define _LINUX_OF_FDT_H 14 15 #include <linux/types.h> 16 #include <linux/init.h> 17 18 /* Definitions used by the flattened device tree */ 19 #define OF_DT_HEADER 0xd00dfeed /* marker */ 20 #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ 21 #define OF_DT_END_NODE 0x2 /* End node */ 22 #define OF_DT_PROP 0x3 /* Property: name off, size, 23 * content */ 24 #define OF_DT_NOP 0x4 /* nop */ 25 #define OF_DT_END 0x9 26 27 #define OF_DT_VERSION 0x10 28 29 #ifndef __ASSEMBLY__ 30 /* 31 * This is what gets passed to the kernel by prom_init or kexec 32 * 33 * The dt struct contains the device tree structure, full pathes and 34 * property contents. The dt strings contain a separate block with just 35 * the strings for the property names, and is fully page aligned and 36 * self contained in a page, so that it can be kept around by the kernel, 37 * each property name appears only once in this page (cheap compression) 38 * 39 * the mem_rsvmap contains a map of reserved ranges of physical memory, 40 * passing it here instead of in the device-tree itself greatly simplifies 41 * the job of everybody. It's just a list of u64 pairs (base/size) that 42 * ends when size is 0 43 */ 44 struct boot_param_header { 45 u32 magic; /* magic word OF_DT_HEADER */ 46 u32 totalsize; /* total size of DT block */ 47 u32 off_dt_struct; /* offset to structure */ 48 u32 off_dt_strings; /* offset to strings */ 49 u32 off_mem_rsvmap; /* offset to memory reserve map */ 50 u32 version; /* format version */ 51 u32 last_comp_version; /* last compatible version */ 52 /* version 2 fields below */ 53 u32 boot_cpuid_phys; /* Physical CPU id we're booting on */ 54 /* version 3 fields below */ 55 u32 dt_strings_size; /* size of the DT strings block */ 56 /* version 17 fields below */ 57 u32 dt_struct_size; /* size of the DT structure block */ 58 }; 59 60 /* For scanning the flat device-tree at boot time */ 61 extern int __init of_scan_flat_dt(int (*it)(unsigned long node, 62 const char *uname, int depth, 63 void *data), 64 void *data); 65 extern void __init *of_get_flat_dt_prop(unsigned long node, const char *name, 66 unsigned long *size); 67 extern int __init of_flat_dt_is_compatible(unsigned long node, 68 const char *name); 69 extern unsigned long __init of_get_flat_dt_root(void); 70 71 /* Other Prototypes */ 72 extern void finish_device_tree(void); 73 extern void unflatten_device_tree(void); 74 extern void early_init_devtree(void *); 75 extern int machine_is_compatible(const char *compat); 76 extern void print_properties(struct device_node *node); 77 extern int prom_n_intr_cells(struct device_node* np); 78 extern void prom_get_irq_senses(unsigned char *senses, int off, int max); 79 extern int prom_add_property(struct device_node* np, struct property* prop); 80 extern int prom_remove_property(struct device_node *np, struct property *prop); 81 extern int prom_update_property(struct device_node *np, 82 struct property *newprop, 83 struct property *oldprop); 84 85 #endif /* __ASSEMBLY__ */ 86 #endif /* _LINUX_OF_FDT_H */ 87