include/asm-ppc/prom.h

   1 /*
   2  * Definitions for talking to the Open Firmware PROM on
   3  * Power Macintosh computers.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  */
   7 #ifdef __KERNEL__
   8 #ifndef _PPC_PROM_H
   9 #define _PPC_PROM_H
  10
  11 #include <linux/config.h>
  12 #include <linux/types.h>
  13
  14 typedef u32 phandle;
  15 typedef u32 ihandle;
  16
  17 extern char *prom_display_paths[];
  18 extern unsigned int prom_num_displays;
  19
  20 struct address_range {
  21         unsigned int space;
  22         unsigned int address;
  23         unsigned int size;
  24 };
  25
  26 struct interrupt_info {
  27         int     line;
  28         int     sense;          /* +ve/-ve logic, edge or level, etc. */
  29 };
  30
  31 struct reg_property {
  32         unsigned int address;
  33         unsigned int size;
  34 };
  35
  36 struct property {
  37         char    *name;
  38         int     length;
  39         unsigned char *value;
  40         struct property *next;
  41 };
  42
  43 /*
  44  * Note: don't change this structure for now or you'll break BootX !
  45  */
  46 struct device_node {
  47         char    *name;
  48         char    *type;
  49         phandle node;
  50         int     n_addrs;
  51         struct  address_range *addrs;
  52         int     n_intrs;
  53         struct  interrupt_info *intrs;
  54         char    *full_name;
  55         struct  property *properties;
  56         struct  device_node *parent;
  57         struct  device_node *child;
  58         struct  device_node *sibling;
  59         struct  device_node *next;      /* next device of same type */
  60         struct  device_node *allnext;   /* next in list of all nodes */
  61 };
  62
  63 struct prom_args;
  64 typedef void (*prom_entry)(struct prom_args *);
  65
  66 /* OBSOLETE: Old style node lookup */
  67 extern struct device_node *find_devices(const char *name);
  68 extern struct device_node *find_type_devices(const char *type);
  69 extern struct device_node *find_path_device(const char *path);
  70 extern struct device_node *find_compatible_devices(const char *type,
  71                                                    const char *compat);
  72 extern struct device_node *find_all_nodes(void);
  73
  74 /* New style node lookup */
  75 extern struct device_node *of_find_node_by_name(struct device_node *from,
  76         const char *name);
  77 extern struct device_node *of_find_node_by_type(struct device_node *from,
  78         const char *type);
  79 extern struct device_node *of_find_compatible_node(struct device_node *from,
  80         const char *type, const char *compat);
  81 extern struct device_node *of_find_node_by_path(const char *path);
  82 extern struct device_node *of_find_all_nodes(struct device_node *prev);
  83 extern struct device_node *of_get_parent(const struct device_node *node);
  84 extern struct device_node *of_get_next_child(const struct device_node *node,
  85                                              struct device_node *prev);
  86 extern struct device_node *of_node_get(struct device_node *node);
  87 extern void of_node_put(struct device_node *node);
  88
  89 /* Other Prototypes */
  90 extern void abort(void);
  91 extern unsigned long prom_init(int, int, prom_entry);
  92 extern void prom_print(const char *msg);
  93 extern void relocate_nodes(void);
  94 extern void finish_device_tree(void);
  95 extern int device_is_compatible(struct device_node *device, const char *);
  96 extern int machine_is_compatible(const char *compat);
  97 extern unsigned char *get_property(struct device_node *node, const char *name,
  98                                    int *lenp);
  99 extern void prom_add_property(struct device_node* np, struct property* prop);
 100 extern void prom_get_irq_senses(unsigned char *, int, int);
 101 extern int prom_n_addr_cells(struct device_node* np);
 102 extern int prom_n_size_cells(struct device_node* np);
 103
 104 extern struct resource*
 105 request_OF_resource(struct device_node* node, int index, const char* name_postfix);
 106 extern int release_OF_resource(struct device_node* node, int index);
 107
 108 extern void print_properties(struct device_node *node);
 109 extern int call_rtas(const char *service, int nargs, int nret,
 110                      unsigned long *outputs, ...);
 111
 112 /*
 113  * PCI <-> OF matching functions
 114  */
 115 struct pci_bus;
 116 struct pci_dev;
 117 extern int pci_device_from_OF_node(struct device_node *node,
 118                                    u8* bus, u8* devfn);
 119 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
 120 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
 121 extern void pci_create_OF_bus_map(void);
 122
 123 /*
 124  * When we call back to the Open Firmware client interface, we usually
 125  * have to do that before the kernel is relocated to its final location
 126  * (this is because we can't use OF after we have overwritten the
 127  * exception vectors with our exception handlers).  These macros assist
 128  * in performing the address calculations that we need to do to access
 129  * data when the kernel is running at an address that is different from
 130  * the address that the kernel is linked at.  The reloc_offset() function
 131  * returns the difference between these two addresses and the macros
 132  * simplify the process of adding or subtracting this offset to/from
 133  * pointer values.  See arch/ppc/kernel/prom.c for how these are used.
 134  */
 135 extern unsigned long reloc_offset(void);
 136 extern unsigned long add_reloc_offset(unsigned long);
 137 extern unsigned long sub_reloc_offset(unsigned long);
 138
 139 #define PTRRELOC(x)     ((typeof(x))add_reloc_offset((unsigned long)(x)))
 140 #define PTRUNRELOC(x)   ((typeof(x))sub_reloc_offset((unsigned long)(x)))
 141
 142 #endif /* _PPC_PROM_H */
 143 #endif /* __KERNEL__ */