include/asm-powerpc/prom.h

   1 #ifndef _POWERPC_PROM_H
   2 #define _POWERPC_PROM_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * Definitions for talking to the Open Firmware PROM on
   7  * Power Macintosh computers.
   8  *
   9  * Copyright (C) 1996-2005 Paul Mackerras.
  10  *
  11  * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version
  16  * 2 of the License, or (at your option) any later version.
  17  */
  18 #include <linux/types.h>
  19 #include <linux/proc_fs.h>
  20 #include <asm/atomic.h>
  21
  22 /* Definitions used by the flattened device tree */
  23 #define OF_DT_HEADER            0xd00dfeed      /* marker */
  24 #define OF_DT_BEGIN_NODE        0x1             /* Start of node, full name */
  25 #define OF_DT_END_NODE          0x2             /* End node */
  26 #define OF_DT_PROP              0x3             /* Property: name off, size,
  27                                                  * content */
  28 #define OF_DT_NOP               0x4             /* nop */
  29 #define OF_DT_END               0x9
  30
  31 #define OF_DT_VERSION           0x10
  32
  33 /*
  34  * This is what gets passed to the kernel by prom_init or kexec
  35  *
  36  * The dt struct contains the device tree structure, full pathes and
  37  * property contents. The dt strings contain a separate block with just
  38  * the strings for the property names, and is fully page aligned and
  39  * self contained in a page, so that it can be kept around by the kernel,
  40  * each property name appears only once in this page (cheap compression)
  41  *
  42  * the mem_rsvmap contains a map of reserved ranges of physical memory,
  43  * passing it here instead of in the device-tree itself greatly simplifies
  44  * the job of everybody. It's just a list of u64 pairs (base/size) that
  45  * ends when size is 0
  46  */
  47 struct boot_param_header
  48 {
  49         u32     magic;                  /* magic word OF_DT_HEADER */
  50         u32     totalsize;              /* total size of DT block */
  51         u32     off_dt_struct;          /* offset to structure */
  52         u32     off_dt_strings;         /* offset to strings */
  53         u32     off_mem_rsvmap;         /* offset to memory reserve map */
  54         u32     version;                /* format version */
  55         u32     last_comp_version;      /* last compatible version */
  56         /* version 2 fields below */
  57         u32     boot_cpuid_phys;        /* Physical CPU id we're booting on */
  58         /* version 3 fields below */
  59         u32     dt_strings_size;        /* size of the DT strings block */
  60 };
  61
  62
  63
  64 typedef u32 phandle;
  65 typedef u32 ihandle;
  66
  67 struct interrupt_info {
  68         int     line;
  69         int     sense;          /* +ve/-ve logic, edge or level, etc. */
  70 };
  71
  72 struct property {
  73         char    *name;
  74         int     length;
  75         unsigned char *value;
  76         struct property *next;
  77 };
  78
  79 struct device_node {
  80         char    *name;
  81         char    *type;
  82         phandle node;
  83         phandle linux_phandle;
  84         int     n_intrs;
  85         struct  interrupt_info *intrs;
  86         char    *full_name;
  87
  88         struct  property *properties;
  89         struct  property *deadprops; /* removed properties */
  90         struct  device_node *parent;
  91         struct  device_node *child;
  92         struct  device_node *sibling;
  93         struct  device_node *next;      /* next device of same type */
  94         struct  device_node *allnext;   /* next in list of all nodes */
  95         struct  proc_dir_entry *pde;    /* this node's proc directory */
  96         struct  kref kref;
  97         unsigned long _flags;
  98         void    *data;
  99 };
 100
 101 extern struct device_node *of_chosen;
 102
 103 /* flag descriptions */
 104 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
 105
 106 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 107 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 108
 109 #define HAVE_ARCH_DEVTREE_FIXUPS
 110
 111 static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
 112 {
 113         dn->pde = de;
 114 }
 115
 116
 117 /* OBSOLETE: Old style node lookup */
 118 extern struct device_node *find_devices(const char *name);
 119 extern struct device_node *find_type_devices(const char *type);
 120 extern struct device_node *find_path_device(const char *path);
 121 extern struct device_node *find_compatible_devices(const char *type,
 122                                                    const char *compat);
 123 extern struct device_node *find_all_nodes(void);
 124
 125 /* New style node lookup */
 126 extern struct device_node *of_find_node_by_name(struct device_node *from,
 127         const char *name);
 128 #define for_each_node_by_name(dn, name) \
 129         for (dn = of_find_node_by_name(NULL, name); dn; \
 130              dn = of_find_node_by_name(dn, name))
 131 extern struct device_node *of_find_node_by_type(struct device_node *from,
 132         const char *type);
 133 #define for_each_node_by_type(dn, type) \
 134         for (dn = of_find_node_by_type(NULL, type); dn; \
 135              dn = of_find_node_by_type(dn, type))
 136 extern struct device_node *of_find_compatible_node(struct device_node *from,
 137         const char *type, const char *compat);
 138 extern struct device_node *of_find_node_by_path(const char *path);
 139 extern struct device_node *of_find_node_by_phandle(phandle handle);
 140 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 141 extern struct device_node *of_get_parent(const struct device_node *node);
 142 extern struct device_node *of_get_next_child(const struct device_node *node,
 143                                              struct device_node *prev);
 144 extern struct property *of_find_property(struct device_node *np,
 145                                          const char *name,
 146                                          int *lenp);
 147 extern struct device_node *of_node_get(struct device_node *node);
 148 extern void of_node_put(struct device_node *node);
 149
 150 /* For scanning the flat device-tree at boot time */
 151 extern int __init of_scan_flat_dt(int (*it)(unsigned long node,
 152                                             const char *uname, int depth,
 153                                             void *data),
 154                                   void *data);
 155 extern void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
 156                                         unsigned long *size);
 157 extern int __init of_flat_dt_is_compatible(unsigned long node, const char *name);
 158 extern unsigned long __init of_get_flat_dt_root(void);
 159
 160 /* For updating the device tree at runtime */
 161 extern void of_attach_node(struct device_node *);
 162 extern void of_detach_node(const struct device_node *);
 163
 164 /* Other Prototypes */
 165 extern void finish_device_tree(void);
 166 extern void unflatten_device_tree(void);
 167 extern void early_init_devtree(void *);
 168 extern int device_is_compatible(struct device_node *device, const char *);
 169 extern int machine_is_compatible(const char *compat);
 170 extern unsigned char *get_property(struct device_node *node, const char *name,
 171                                    int *lenp);
 172 extern void print_properties(struct device_node *node);
 173 extern int prom_n_addr_cells(struct device_node* np);
 174 extern int prom_n_size_cells(struct device_node* np);
 175 extern int prom_n_intr_cells(struct device_node* np);
 176 extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
 177 extern int prom_add_property(struct device_node* np, struct property* prop);
 178 extern int prom_remove_property(struct device_node *np, struct property *prop);
 179 extern int prom_update_property(struct device_node *np,
 180                                 struct property *newprop,
 181                                 struct property *oldprop);
 182
 183 #ifdef CONFIG_PPC32
 184 /*
 185  * PCI <-> OF matching functions
 186  * (XXX should these be here?)
 187  */
 188 struct pci_bus;
 189 struct pci_dev;
 190 extern int pci_device_from_OF_node(struct device_node *node,
 191                                    u8* bus, u8* devfn);
 192 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
 193 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
 194 extern void pci_create_OF_bus_map(void);
 195 #endif
 196
 197 extern struct resource *request_OF_resource(struct device_node* node,
 198                                 int index, const char* name_postfix);
 199 extern int release_OF_resource(struct device_node* node, int index);
 200
 201
 202 /*
 203  * OF address retreival & translation
 204  */
 205
 206
 207 /* Translate an OF address block into a CPU physical address
 208  */
 209 #define OF_BAD_ADDR     ((u64)-1)
 210 extern u64 of_translate_address(struct device_node *np, u32 *addr);
 211
 212 /* Extract an address from a device, returns the region size and
 213  * the address space flags too. The PCI version uses a BAR number
 214  * instead of an absolute index
 215  */
 216 extern u32 *of_get_address(struct device_node *dev, int index,
 217                            u64 *size, unsigned int *flags);
 218 extern u32 *of_get_pci_address(struct device_node *dev, int bar_no,
 219                                u64 *size, unsigned int *flags);
 220
 221 /* Get an address as a resource. Note that if your address is
 222  * a PIO address, the conversion will fail if the physical address
 223  * can't be internally converted to an IO token with
 224  * pci_address_to_pio(), that is because it's either called to early
 225  * or it can't be matched to any host bridge IO space
 226  */
 227 extern int of_address_to_resource(struct device_node *dev, int index,
 228                                   struct resource *r);
 229 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
 230                                       struct resource *r);
 231
 232 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
 233  * size parameters.
 234  */
 235 void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
 236                 unsigned long *busno, unsigned long *phys, unsigned long *size);
 237
 238 extern void kdump_move_device_tree(void);
 239
 240 /* CPU OF node matching */
 241 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 242
 243 #endif /* __KERNEL__ */
 244 #endif /* _POWERPC_PROM_H */