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 property {
  68         char    *name;
  69         int     length;
  70         unsigned char *value;
  71         struct property *next;
  72 };
  73
  74 struct device_node {
  75         const char *name;
  76         const char *type;
  77         phandle node;
  78         phandle linux_phandle;
  79         char    *full_name;
  80
  81         struct  property *properties;
  82         struct  property *deadprops; /* removed properties */
  83         struct  device_node *parent;
  84         struct  device_node *child;
  85         struct  device_node *sibling;
  86         struct  device_node *next;      /* next device of same type */
  87         struct  device_node *allnext;   /* next in list of all nodes */
  88         struct  proc_dir_entry *pde;    /* this node's proc directory */
  89         struct  kref kref;
  90         unsigned long _flags;
  91         void    *data;
  92 };
  93
  94 extern struct device_node *of_chosen;
  95
  96 /* flag descriptions */
  97 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
  98
  99 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 100 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 101
 102 #define HAVE_ARCH_DEVTREE_FIXUPS
 103
 104 static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
 105 {
 106         dn->pde = de;
 107 }
 108
 109
 110 /* OBSOLETE: Old style node lookup */
 111 extern struct device_node *find_devices(const char *name);
 112 extern struct device_node *find_type_devices(const char *type);
 113 extern struct device_node *find_path_device(const char *path);
 114 extern struct device_node *find_compatible_devices(const char *type,
 115                                                    const char *compat);
 116 extern struct device_node *find_all_nodes(void);
 117
 118 /* New style node lookup */
 119 extern struct device_node *of_find_node_by_name(struct device_node *from,
 120         const char *name);
 121 #define for_each_node_by_name(dn, name) \
 122         for (dn = of_find_node_by_name(NULL, name); dn; \
 123              dn = of_find_node_by_name(dn, name))
 124 extern struct device_node *of_find_node_by_type(struct device_node *from,
 125         const char *type);
 126 #define for_each_node_by_type(dn, type) \
 127         for (dn = of_find_node_by_type(NULL, type); dn; \
 128              dn = of_find_node_by_type(dn, type))
 129 extern struct device_node *of_find_compatible_node(struct device_node *from,
 130         const char *type, const char *compat);
 131 extern struct device_node *of_find_node_by_path(const char *path);
 132 extern struct device_node *of_find_node_by_phandle(phandle handle);
 133 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 134 extern struct device_node *of_get_parent(const struct device_node *node);
 135 extern struct device_node *of_get_next_child(const struct device_node *node,
 136                                              struct device_node *prev);
 137 extern struct property *of_find_property(const struct device_node *np,
 138                                          const char *name,
 139                                          int *lenp);
 140 extern struct device_node *of_node_get(struct device_node *node);
 141 extern void of_node_put(struct device_node *node);
 142
 143 /* For scanning the flat device-tree at boot time */
 144 extern int __init of_scan_flat_dt(int (*it)(unsigned long node,
 145                                             const char *uname, int depth,
 146                                             void *data),
 147                                   void *data);
 148 extern void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
 149                                         unsigned long *size);
 150 extern int __init of_flat_dt_is_compatible(unsigned long node, const char *name);
 151 extern unsigned long __init of_get_flat_dt_root(void);
 152
 153 /* For updating the device tree at runtime */
 154 extern void of_attach_node(struct device_node *);
 155 extern void of_detach_node(const struct device_node *);
 156
 157 /* Other Prototypes */
 158 extern void finish_device_tree(void);
 159 extern void unflatten_device_tree(void);
 160 extern void early_init_devtree(void *);
 161 extern int device_is_compatible(const struct device_node *device,
 162                                 const char *);
 163 extern int machine_is_compatible(const char *compat);
 164 extern const void *get_property(const struct device_node *node,
 165                                 const char *name,
 166                                 int *lenp);
 167 extern void print_properties(struct device_node *node);
 168 extern int prom_n_addr_cells(struct device_node* np);
 169 extern int prom_n_size_cells(struct device_node* np);
 170 extern int prom_n_intr_cells(struct device_node* np);
 171 extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
 172 extern int prom_add_property(struct device_node* np, struct property* prop);
 173 extern int prom_remove_property(struct device_node *np, struct property *prop);
 174 extern int prom_update_property(struct device_node *np,
 175                                 struct property *newprop,
 176                                 struct property *oldprop);
 177
 178 #ifdef CONFIG_PPC32
 179 /*
 180  * PCI <-> OF matching functions
 181  * (XXX should these be here?)
 182  */
 183 struct pci_bus;
 184 struct pci_dev;
 185 extern int pci_device_from_OF_node(struct device_node *node,
 186                                    u8* bus, u8* devfn);
 187 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
 188 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
 189 extern void pci_create_OF_bus_map(void);
 190 #endif
 191
 192 extern struct resource *request_OF_resource(struct device_node* node,
 193                                 int index, const char* name_postfix);
 194 extern int release_OF_resource(struct device_node* node, int index);
 195
 196
 197 /*
 198  * OF address retreival & translation
 199  */
 200
 201
 202 /* Helper to read a big number; size is in cells (not bytes) */
 203 static inline u64 of_read_number(const u32 *cell, int size)
 204 {
 205         u64 r = 0;
 206         while (size--)
 207                 r = (r << 32) | *(cell++);
 208         return r;
 209 }
 210
 211 /* Like of_read_number, but we want an unsigned long result */
 212 #ifdef CONFIG_PPC32
 213 static inline unsigned long of_read_ulong(const u32 *cell, int size)
 214 {
 215         return cell[size-1];
 216 }
 217 #else
 218 #define of_read_ulong(cell, size)       of_read_number(cell, size)
 219 #endif
 220
 221 /* Translate an OF address block into a CPU physical address
 222  */
 223 #define OF_BAD_ADDR     ((u64)-1)
 224 extern u64 of_translate_address(struct device_node *np, const u32 *addr);
 225
 226 /* Extract an address from a device, returns the region size and
 227  * the address space flags too. The PCI version uses a BAR number
 228  * instead of an absolute index
 229  */
 230 extern const u32 *of_get_address(struct device_node *dev, int index,
 231                            u64 *size, unsigned int *flags);
 232 extern const u32 *of_get_pci_address(struct device_node *dev, int bar_no,
 233                                u64 *size, unsigned int *flags);
 234
 235 /* Get an address as a resource. Note that if your address is
 236  * a PIO address, the conversion will fail if the physical address
 237  * can't be internally converted to an IO token with
 238  * pci_address_to_pio(), that is because it's either called to early
 239  * or it can't be matched to any host bridge IO space
 240  */
 241 extern int of_address_to_resource(struct device_node *dev, int index,
 242                                   struct resource *r);
 243 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
 244                                       struct resource *r);
 245
 246 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
 247  * size parameters.
 248  */
 249 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
 250                 unsigned long *busno, unsigned long *phys, unsigned long *size);
 251
 252 extern void kdump_move_device_tree(void);
 253
 254 /* CPU OF node matching */
 255 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 256
 257
 258 /*
 259  * OF interrupt mapping
 260  */
 261
 262 /* This structure is returned when an interrupt is mapped. The controller
 263  * field needs to be put() after use
 264  */
 265
 266 #define OF_MAX_IRQ_SPEC          4 /* We handle specifiers of at most 4 cells */
 267
 268 struct of_irq {
 269         struct device_node *controller; /* Interrupt controller node */
 270         u32 size;                       /* Specifier size */
 271         u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
 272 };
 273
 274 /**
 275  * of_irq_map_init - Initialize the irq remapper
 276  * @flags:      flags defining workarounds to enable
 277  *
 278  * Some machines have bugs in the device-tree which require certain workarounds
 279  * to be applied. Call this before any interrupt mapping attempts to enable
 280  * those workarounds.
 281  */
 282 #define OF_IMAP_OLDWORLD_MAC    0x00000001
 283 #define OF_IMAP_NO_PHANDLE      0x00000002
 284
 285 extern void of_irq_map_init(unsigned int flags);
 286
 287 /**
 288  * of_irq_map_raw - Low level interrupt tree parsing
 289  * @parent:     the device interrupt parent
 290  * @intspec:    interrupt specifier ("interrupts" property of the device)
 291  * @ointsize:   size of the passed in interrupt specifier
 292  * @addr:       address specifier (start of "reg" property of the device)
 293  * @out_irq:    structure of_irq filled by this function
 294  *
 295  * Returns 0 on success and a negative number on error
 296  *
 297  * This function is a low-level interrupt tree walking function. It
 298  * can be used to do a partial walk with synthetized reg and interrupts
 299  * properties, for example when resolving PCI interrupts when no device
 300  * node exist for the parent.
 301  *
 302  */
 303
 304 extern int of_irq_map_raw(struct device_node *parent, const u32 *intspec,
 305                           u32 ointsize, const u32 *addr,
 306                           struct of_irq *out_irq);
 307
 308
 309 /**
 310  * of_irq_map_one - Resolve an interrupt for a device
 311  * @device:     the device whose interrupt is to be resolved
 312  * @index:      index of the interrupt to resolve
 313  * @out_irq:    structure of_irq filled by this function
 314  *
 315  * This function resolves an interrupt, walking the tree, for a given
 316  * device-tree node. It's the high level pendant to of_irq_map_raw().
 317  * It also implements the workarounds for OldWolrd Macs.
 318  */
 319 extern int of_irq_map_one(struct device_node *device, int index,
 320                           struct of_irq *out_irq);
 321
 322 /**
 323  * of_irq_map_pci - Resolve the interrupt for a PCI device
 324  * @pdev:       the device whose interrupt is to be resolved
 325  * @out_irq:    structure of_irq filled by this function
 326  *
 327  * This function resolves the PCI interrupt for a given PCI device. If a
 328  * device-node exists for a given pci_dev, it will use normal OF tree
 329  * walking. If not, it will implement standard swizzling and walk up the
 330  * PCI tree until an device-node is found, at which point it will finish
 331  * resolving using the OF tree walking.
 332  */
 333 struct pci_dev;
 334 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
 335
 336
 337 #endif /* __KERNEL__ */
 338 #endif /* _POWERPC_PROM_H */