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