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 <linux/platform_device.h>
  21 #include <asm/irq.h>
  22 #include <asm/atomic.h>
  23
  24 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
  25 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
  26
  27 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
  28 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
  29 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
  30
  31 /* Definitions used by the flattened device tree */
  32 #define OF_DT_HEADER            0xd00dfeed      /* marker */
  33 #define OF_DT_BEGIN_NODE        0x1             /* Start of node, full name */
  34 #define OF_DT_END_NODE          0x2             /* End node */
  35 #define OF_DT_PROP              0x3             /* Property: name off, size,
  36                                                  * content */
  37 #define OF_DT_NOP               0x4             /* nop */
  38 #define OF_DT_END               0x9
  39
  40 #define OF_DT_VERSION           0x10
  41
  42 /*
  43  * This is what gets passed to the kernel by prom_init or kexec
  44  *
  45  * The dt struct contains the device tree structure, full pathes and
  46  * property contents. The dt strings contain a separate block with just
  47  * the strings for the property names, and is fully page aligned and
  48  * self contained in a page, so that it can be kept around by the kernel,
  49  * each property name appears only once in this page (cheap compression)
  50  *
  51  * the mem_rsvmap contains a map of reserved ranges of physical memory,
  52  * passing it here instead of in the device-tree itself greatly simplifies
  53  * the job of everybody. It's just a list of u64 pairs (base/size) that
  54  * ends when size is 0
  55  */
  56 struct boot_param_header
  57 {
  58         u32     magic;                  /* magic word OF_DT_HEADER */
  59         u32     totalsize;              /* total size of DT block */
  60         u32     off_dt_struct;          /* offset to structure */
  61         u32     off_dt_strings;         /* offset to strings */
  62         u32     off_mem_rsvmap;         /* offset to memory reserve map */
  63         u32     version;                /* format version */
  64         u32     last_comp_version;      /* last compatible version */
  65         /* version 2 fields below */
  66         u32     boot_cpuid_phys;        /* Physical CPU id we're booting on */
  67         /* version 3 fields below */
  68         u32     dt_strings_size;        /* size of the DT strings block */
  69         /* version 17 fields below */
  70         u32     dt_struct_size;         /* size of the DT structure block */
  71 };
  72
  73
  74
  75 typedef u32 phandle;
  76 typedef u32 ihandle;
  77
  78 struct property {
  79         char    *name;
  80         int     length;
  81         void    *value;
  82         struct property *next;
  83 };
  84
  85 struct device_node {
  86         const char *name;
  87         const char *type;
  88         phandle node;
  89         phandle linux_phandle;
  90         char    *full_name;
  91
  92         struct  property *properties;
  93         struct  property *deadprops; /* removed properties */
  94         struct  device_node *parent;
  95         struct  device_node *child;
  96         struct  device_node *sibling;
  97         struct  device_node *next;      /* next device of same type */
  98         struct  device_node *allnext;   /* next in list of all nodes */
  99         struct  proc_dir_entry *pde;    /* this node's proc directory */
 100         struct  kref kref;
 101         unsigned long _flags;
 102         void    *data;
 103 };
 104
 105 extern struct device_node *of_chosen;
 106
 107 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
 108 {
 109         return test_bit(flag, &n->_flags);
 110 }
 111
 112 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
 113 {
 114         set_bit(flag, &n->_flags);
 115 }
 116
 117
 118 #define HAVE_ARCH_DEVTREE_FIXUPS
 119
 120 static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
 121 {
 122         dn->pde = de;
 123 }
 124
 125
 126 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 127 extern struct device_node *of_node_get(struct device_node *node);
 128 extern void of_node_put(struct device_node *node);
 129
 130 /* For scanning the flat device-tree at boot time */
 131 extern int __init of_scan_flat_dt(int (*it)(unsigned long node,
 132                                             const char *uname, int depth,
 133                                             void *data),
 134                                   void *data);
 135 extern void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
 136                                         unsigned long *size);
 137 extern int __init of_flat_dt_is_compatible(unsigned long node, const char *name);
 138 extern unsigned long __init of_get_flat_dt_root(void);
 139
 140 /* For updating the device tree at runtime */
 141 extern void of_attach_node(struct device_node *);
 142 extern void of_detach_node(struct device_node *);
 143
 144 /* Other Prototypes */
 145 extern void finish_device_tree(void);
 146 extern void unflatten_device_tree(void);
 147 extern void early_init_devtree(void *);
 148 extern int machine_is_compatible(const char *compat);
 149 extern void print_properties(struct device_node *node);
 150 extern int prom_n_intr_cells(struct device_node* np);
 151 extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
 152 extern int prom_add_property(struct device_node* np, struct property* prop);
 153 extern int prom_remove_property(struct device_node *np, struct property *prop);
 154 extern int prom_update_property(struct device_node *np,
 155                                 struct property *newprop,
 156                                 struct property *oldprop);
 157
 158 #ifdef CONFIG_PPC32
 159 /*
 160  * PCI <-> OF matching functions
 161  * (XXX should these be here?)
 162  */
 163 struct pci_bus;
 164 struct pci_dev;
 165 extern int pci_device_from_OF_node(struct device_node *node,
 166                                    u8* bus, u8* devfn);
 167 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
 168 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
 169 extern void pci_create_OF_bus_map(void);
 170 #endif
 171
 172 extern struct resource *request_OF_resource(struct device_node* node,
 173                                 int index, const char* name_postfix);
 174 extern int release_OF_resource(struct device_node* node, int index);
 175
 176
 177 /*
 178  * OF address retreival & translation
 179  */
 180
 181
 182 /* Helper to read a big number; size is in cells (not bytes) */
 183 static inline u64 of_read_number(const u32 *cell, int size)
 184 {
 185         u64 r = 0;
 186         while (size--)
 187                 r = (r << 32) | *(cell++);
 188         return r;
 189 }
 190
 191 /* Like of_read_number, but we want an unsigned long result */
 192 #ifdef CONFIG_PPC32
 193 static inline unsigned long of_read_ulong(const u32 *cell, int size)
 194 {
 195         return cell[size-1];
 196 }
 197 #else
 198 #define of_read_ulong(cell, size)       of_read_number(cell, size)
 199 #endif
 200
 201 /* Translate an OF address block into a CPU physical address
 202  */
 203 extern u64 of_translate_address(struct device_node *np, const u32 *addr);
 204
 205 /* Translate a DMA address from device space to CPU space */
 206 extern u64 of_translate_dma_address(struct device_node *dev,
 207                                     const u32 *in_addr);
 208
 209 /* Extract an address from a device, returns the region size and
 210  * the address space flags too. The PCI version uses a BAR number
 211  * instead of an absolute index
 212  */
 213 extern const u32 *of_get_address(struct device_node *dev, int index,
 214                            u64 *size, unsigned int *flags);
 215 extern const u32 *of_get_pci_address(struct device_node *dev, int bar_no,
 216                                u64 *size, unsigned int *flags);
 217
 218 /* Get an address as a resource. Note that if your address is
 219  * a PIO address, the conversion will fail if the physical address
 220  * can't be internally converted to an IO token with
 221  * pci_address_to_pio(), that is because it's either called to early
 222  * or it can't be matched to any host bridge IO space
 223  */
 224 extern int of_address_to_resource(struct device_node *dev, int index,
 225                                   struct resource *r);
 226 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
 227                                       struct resource *r);
 228
 229 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
 230  * size parameters.
 231  */
 232 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
 233                 unsigned long *busno, unsigned long *phys, unsigned long *size);
 234
 235 extern void kdump_move_device_tree(void);
 236
 237 /* CPU OF node matching */
 238 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 239
 240 /* Get the MAC address */
 241 extern const void *of_get_mac_address(struct device_node *np);
 242
 243 /*
 244  * OF interrupt mapping
 245  */
 246
 247 /* This structure is returned when an interrupt is mapped. The controller
 248  * field needs to be put() after use
 249  */
 250
 251 #define OF_MAX_IRQ_SPEC          4 /* We handle specifiers of at most 4 cells */
 252
 253 struct of_irq {
 254         struct device_node *controller; /* Interrupt controller node */
 255         u32 size;                       /* Specifier size */
 256         u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
 257 };
 258
 259 /**
 260  * of_irq_map_init - Initialize the irq remapper
 261  * @flags:      flags defining workarounds to enable
 262  *
 263  * Some machines have bugs in the device-tree which require certain workarounds
 264  * to be applied. Call this before any interrupt mapping attempts to enable
 265  * those workarounds.
 266  */
 267 #define OF_IMAP_OLDWORLD_MAC    0x00000001
 268 #define OF_IMAP_NO_PHANDLE      0x00000002
 269
 270 extern void of_irq_map_init(unsigned int flags);
 271
 272 /**
 273  * of_irq_map_raw - Low level interrupt tree parsing
 274  * @parent:     the device interrupt parent
 275  * @intspec:    interrupt specifier ("interrupts" property of the device)
 276  * @ointsize:   size of the passed in interrupt specifier
 277  * @addr:       address specifier (start of "reg" property of the device)
 278  * @out_irq:    structure of_irq filled by this function
 279  *
 280  * Returns 0 on success and a negative number on error
 281  *
 282  * This function is a low-level interrupt tree walking function. It
 283  * can be used to do a partial walk with synthetized reg and interrupts
 284  * properties, for example when resolving PCI interrupts when no device
 285  * node exist for the parent.
 286  *
 287  */
 288
 289 extern int of_irq_map_raw(struct device_node *parent, const u32 *intspec,
 290                           u32 ointsize, const u32 *addr,
 291                           struct of_irq *out_irq);
 292
 293
 294 /**
 295  * of_irq_map_one - Resolve an interrupt for a device
 296  * @device:     the device whose interrupt is to be resolved
 297  * @index:      index of the interrupt to resolve
 298  * @out_irq:    structure of_irq filled by this function
 299  *
 300  * This function resolves an interrupt, walking the tree, for a given
 301  * device-tree node. It's the high level pendant to of_irq_map_raw().
 302  * It also implements the workarounds for OldWolrd Macs.
 303  */
 304 extern int of_irq_map_one(struct device_node *device, int index,
 305                           struct of_irq *out_irq);
 306
 307 /**
 308  * of_irq_map_pci - Resolve the interrupt for a PCI device
 309  * @pdev:       the device whose interrupt is to be resolved
 310  * @out_irq:    structure of_irq filled by this function
 311  *
 312  * This function resolves the PCI interrupt for a given PCI device. If a
 313  * device-node exists for a given pci_dev, it will use normal OF tree
 314  * walking. If not, it will implement standard swizzling and walk up the
 315  * PCI tree until an device-node is found, at which point it will finish
 316  * resolving using the OF tree walking.
 317  */
 318 struct pci_dev;
 319 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
 320
 321 extern int of_irq_to_resource(struct device_node *dev, int index,
 322                         struct resource *r);
 323
 324 /**
 325  * of_iomap - Maps the memory mapped IO for a given device_node
 326  * @device:     the device whose io range will be mapped
 327  * @index:      index of the io range
 328  *
 329  * Returns a pointer to the mapped memory
 330  */
 331 extern void __iomem *of_iomap(struct device_node *device, int index);
 332
 333 /*
 334  * NB:  This is here while we transition from using asm/prom.h
 335  * to linux/of.h
 336  */
 337 #include <linux/of.h>
 338
 339 #endif /* __KERNEL__ */
 340 #endif /* _POWERPC_PROM_H */