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 * Definitions for talking to the Open Firmware PROM on
 * Power Macintosh computers.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.

#ifdef __KERNEL__

/* Definitions used by the flattened device tree */
#define OF_DT_HEADER          0xd00dfeed /* marker */
#define OF_DT_BEGIN_NODE      0x1 /* Start of node, full name */
#define OF_DT_END_NODE        0x2 /* End node */
#define OF_DT_PROP            0x3 /* Property: name off, size, content */
#define OF_DT_NOP       0x4 /* nop */
#define OF_DT_END       0x9

#define OF_DT_VERSION         0x10

#ifndef __ASSEMBLY__

#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/platform_device.h>
#include <asm/irq.h>
#include <asm/atomic.h>


#define of_compat_cmp(s1, s2, l)    strncasecmp((s1), (s2), (l))
#define of_prop_cmp(s1, s2)         strcmp((s1), (s2))
#define of_node_cmp(s1, s2)         strcasecmp((s1), (s2))

 * This is what gets passed to the kernel by prom_init or kexec
 * The dt struct contains the device tree structure, full pathes and
 * property contents. The dt strings contain a separate block with just
 * the strings for the property names, and is fully page aligned and
 * self contained in a page, so that it can be kept around by the kernel,
 * each property name appears only once in this page (cheap compression)
 * the mem_rsvmap contains a map of reserved ranges of physical memory,
 * passing it here instead of in the device-tree itself greatly simplifies
 * the job of everybody. It's just a list of u64 pairs (base/size) that
 * ends when size is 0
struct boot_param_header {
      u32   magic; /* magic word OF_DT_HEADER */
      u32   totalsize; /* total size of DT block */
      u32   off_dt_struct; /* offset to structure */
      u32   off_dt_strings; /* offset to strings */
      u32   off_mem_rsvmap; /* offset to memory reserve map */
      u32   version; /* format version */
      u32   last_comp_version; /* last compatible version */
      /* version 2 fields below */
      u32   boot_cpuid_phys; /* Physical CPU id we're booting on */
      /* version 3 fields below */
      u32   dt_strings_size; /* size of the DT strings block */
      /* version 17 fields below */
      u32   dt_struct_size; /* size of the DT structure block */

typedef u32 phandle;
typedef u32 ihandle;

struct property {
      char  *name;
      int   length;
      void  *value;
      struct property *next;

struct device_node {
      const char *name;
      const char *type;
      phandle     node;
      phandle linux_phandle;
      char  *full_name;

      struct      property *properties;
      struct      property *deadprops; /* removed properties */
      struct      device_node *parent;
      struct      device_node *child;
      struct      device_node *sibling;
      struct      device_node *next; /* next device of same type */
      struct      device_node *allnext; /* next in list of all nodes */
      struct      proc_dir_entry *pde; /* this node's proc directory */
      struct      kref kref;
      unsigned long _flags;
      void  *data;

extern struct device_node *of_chosen;

static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
      return test_bit(flag, &n->_flags);

static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
      set_bit(flag, &n->_flags);


static inline void set_node_proc_entry(struct device_node *dn,
                              struct proc_dir_entry *de)
      dn->pde = de;

extern struct device_node *allnodes;      /* temporary while merging */
extern rwlock_t devtree_lock; /* temporary while merging */

extern struct device_node *of_find_all_nodes(struct device_node *prev);
extern struct device_node *of_node_get(struct device_node *node);
extern void of_node_put(struct device_node *node);

/* For scanning the flat device-tree at boot time */
extern int __init of_scan_flat_dt(int (*it)(unsigned long node,
                              const char *uname, int depth,
                              void *data),
                        void *data);
extern void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
                              unsigned long *size);
extern int __init
            of_flat_dt_is_compatible(unsigned long node, const char *name);
extern unsigned long __init of_get_flat_dt_root(void);

/* For updating the device tree at runtime */
extern void of_attach_node(struct device_node *);
extern void of_detach_node(struct device_node *);

/* Other Prototypes */
extern void finish_device_tree(void);
extern void unflatten_device_tree(void);
extern int early_uartlite_console(void);
extern void early_init_devtree(void *);
extern int machine_is_compatible(const char *compat);
extern void print_properties(struct device_node *node);
extern int prom_n_intr_cells(struct device_node *np);
extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
extern int prom_add_property(struct device_node *np, struct property *prop);
extern int prom_remove_property(struct device_node *np, struct property *prop);
extern int prom_update_property(struct device_node *np,
                        struct property *newprop,
                        struct property *oldprop);

extern struct resource *request_OF_resource(struct device_node *node,
                        int index, const char *name_postfix);
extern int release_OF_resource(struct device_node *node, int index);

 * OF address retreival & translation

/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const u32 *cell, int size)
      u64 r = 0;
      while (size--)
            r = (r << 32) | *(cell++);
      return r;

/* Like of_read_number, but we want an unsigned long result */
#define of_read_ulong(cell, size)   of_read_number(cell, size)

/* Translate an OF address block into a CPU physical address
extern u64 of_translate_address(struct device_node *np, const u32 *addr);

/* Extract an address from a device, returns the region size and
 * the address space flags too. The PCI version uses a BAR number
 * instead of an absolute index
extern const u32 *of_get_address(struct device_node *dev, int index,
                  u64 *size, unsigned int *flags);
extern const u32 *of_get_pci_address(struct device_node *dev, int bar_no,
                  u64 *size, unsigned int *flags);

/* Get an address as a resource. Note that if your address is
 * a PIO address, the conversion will fail if the physical address
 * can't be internally converted to an IO token with
 * pci_address_to_pio(), that is because it's either called to early
 * or it can't be matched to any host bridge IO space
extern int of_address_to_resource(struct device_node *dev, int index,
                        struct resource *r);
extern int of_pci_address_to_resource(struct device_node *dev, int bar,
                        struct resource *r);

/* Parse the ibm,dma-window property of an OF node into the busno, phys and
 * size parameters.
void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
            unsigned long *busno, unsigned long *phys, unsigned long *size);

extern void kdump_move_device_tree(void);

/* CPU OF node matching */
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);

/* Get the MAC address */
extern const void *of_get_mac_address(struct device_node *np);

 * OF interrupt mapping

/* This structure is returned when an interrupt is mapped. The controller
 * field needs to be put() after use

#define OF_MAX_IRQ_SPEC       4 /* We handle specifiers of at most 4 cells */

struct of_irq {
      struct device_node *controller; /* Interrupt controller node */
      u32 size; /* Specifier size */
      u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */

 * of_irq_map_init - Initialize the irq remapper
 * @flags:  flags defining workarounds to enable
 * Some machines have bugs in the device-tree which require certain workarounds
 * to be applied. Call this before any interrupt mapping attempts to enable
 * those workarounds.
#define OF_IMAP_OLDWORLD_MAC  0x00000001
#define OF_IMAP_NO_PHANDLE    0x00000002

extern void of_irq_map_init(unsigned int flags);

 * of_irq_map_raw - Low level interrupt tree parsing
 * @parent: the device interrupt parent
 * @intspec:      interrupt specifier ("interrupts" property of the device)
 * @ointsize:     size of the passed in interrupt specifier
 * @addr:   address specifier (start of "reg" property of the device)
 * @out_irq:      structure of_irq filled by this function
 * Returns 0 on success and a negative number on error
 * This function is a low-level interrupt tree walking function. It
 * can be used to do a partial walk with synthetized reg and interrupts
 * properties, for example when resolving PCI interrupts when no device
 * node exist for the parent.

extern int of_irq_map_raw(struct device_node *parent, const u32 *intspec,
                  u32 ointsize, const u32 *addr,
                  struct of_irq *out_irq);

 * of_irq_map_one - Resolve an interrupt for a device
 * @device: the device whose interrupt is to be resolved
 * @index:  index of the interrupt to resolve
 * @out_irq:      structure of_irq filled by this function
 * This function resolves an interrupt, walking the tree, for a given
 * device-tree node. It's the high level pendant to of_irq_map_raw().
 * It also implements the workarounds for OldWolrd Macs.
extern int of_irq_map_one(struct device_node *device, int index,
                  struct of_irq *out_irq);

 * of_irq_map_pci - Resolve the interrupt for a PCI device
 * @pdev:   the device whose interrupt is to be resolved
 * @out_irq:      structure of_irq filled by this function
 * This function resolves the PCI interrupt for a given PCI device. If a
 * device-node exists for a given pci_dev, it will use normal OF tree
 * walking. If not, it will implement standard swizzling and walk up the
 * PCI tree until an device-node is found, at which point it will finish
 * resolving using the OF tree walking.
struct pci_dev;
extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);

extern int of_irq_to_resource(struct device_node *dev, int index,
                  struct resource *r);

 * of_iomap - Maps the memory mapped IO for a given device_node
 * @device: the device whose io range will be mapped
 * @index:  index of the io range
 * Returns a pointer to the mapped memory
extern void __iomem *of_iomap(struct device_node *device, int index);

 * NB: This is here while we transition from using asm/prom.h
 * to linux/of.h
#include <linux/of.h>

#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */

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