/*
   * (C) Copyright 2007
   * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   *

   * Copyright 2010-2011 Freescale Semiconductor, Inc.

   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  #include <common.h>

  #include <inttypes.h>

  #include <stdio_dev.h>

  #include <linux/ctype.h>
  #include <linux/types.h>

  #include <asm/global_data.h>

  #include <linux/libfdt.h>

  #include <fdt_support.h>

  #include <exports.h>

  #include <fdtdec.h>

  /**

   * fdt_getprop_u32_default_node - Return a node's property or a default
   *
   * @fdt: ptr to device tree
   * @off: offset of node
   * @cell: cell offset in property
   * @prop: property name
   * @dflt: default value if the property isn't found
   *
   * Convenience function to return a node's property or a default value if
   * the property doesn't exist.
   */
  u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
  				const char *prop, const u32 dflt)
  {
  	const fdt32_t *val;
  	int len;
  
  	val = fdt_getprop(fdt, off, prop, &len);
  
  	/* Check if property exists */
  	if (!val)
  		return dflt;
  
  	/* Check if property is long enough */
  	if (len < ((cell + 1) * sizeof(uint32_t)))
  		return dflt;
  
  	return fdt32_to_cpu(*val);
  }
  
  /**

   * fdt_getprop_u32_default - Find a node and return it's property or a default
   *
   * @fdt: ptr to device tree
   * @path: path of node
   * @prop: property name
   * @dflt: default value if the property isn't found
   *
   * Convenience function to find a node and return it's property or a
   * default value if it doesn't exist.
   */

  u32 fdt_getprop_u32_default(const void *fdt, const char *path,
  				const char *prop, const u32 dflt)

  {

  	int off;
  
  	off = fdt_path_offset(fdt, path);
  	if (off < 0)
  		return dflt;

  	return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);

  }

  /**
   * fdt_find_and_setprop: Find a node and set it's property
   *
   * @fdt: ptr to device tree
   * @node: path of node
   * @prop: property name
   * @val: ptr to new value
   * @len: length of new property value
   * @create: flag to create the property if it doesn't exist
   *
   * Convenience function to directly set a property given the path to the node.
   */
  int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
  			 const void *val, int len, int create)
  {

  	int nodeoff = fdt_path_offset(fdt, node);

  
  	if (nodeoff < 0)
  		return nodeoff;

  	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))

  		return 0; /* create flag not set; so exit quietly */
  
  	return fdt_setprop(fdt, nodeoff, prop, val, len);
  }

  /**

   * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
   *

   * @fdt: pointer to the device tree blob
   * @parentoffset: structure block offset of a node
   * @name: name of the subnode to locate
   *
   * fdt_subnode_offset() finds a subnode of the node with a given name.
   * If the subnode does not exist, it will be created.
   */

  int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)

  {
  	int offset;
  
  	offset = fdt_subnode_offset(fdt, parentoffset, name);
  
  	if (offset == -FDT_ERR_NOTFOUND)
  		offset = fdt_add_subnode(fdt, parentoffset, name);
  
  	if (offset < 0)
  		printf("%s: %s: %s
  ", __func__, name, fdt_strerror(offset));
  
  	return offset;
  }

  /* rename to CONFIG_OF_STDOUT_PATH ? */
  #if defined(OF_STDOUT_PATH)
  static int fdt_fixup_stdout(void *fdt, int chosenoff)
  {
  	return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
  			      OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
  }
  #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)

  static int fdt_fixup_stdout(void *fdt, int chosenoff)

  {

  	int err;
  	int aliasoff;

  	char sername[9] = { 0 };

  	const void *path;
  	int len;
  	char tmp[256]; /* long enough */

  	sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);

  	aliasoff = fdt_path_offset(fdt, "/aliases");
  	if (aliasoff < 0) {
  		err = aliasoff;

  		goto noalias;

  	}

  
  	path = fdt_getprop(fdt, aliasoff, sername, &len);
  	if (!path) {
  		err = len;

  		goto noalias;

  	}
  
  	/* fdt_setprop may break "path" so we copy it to tmp buffer */
  	memcpy(tmp, path, len);
  
  	err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);

  	if (err < 0)
  		printf("WARNING: could not set linux,stdout-path %s.
  ",

  		       fdt_strerror(err));

  
  	return err;

  
  noalias:
  	printf("WARNING: %s: could not read %s alias: %s
  ",
  	       __func__, sername, fdt_strerror(err));
  
  	return 0;

  }

  #else
  static int fdt_fixup_stdout(void *fdt, int chosenoff)
  {
  	return 0;
  }

  #endif

  static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
  				  uint64_t val, int is_u64)
  {
  	if (is_u64)
  		return fdt_setprop_u64(fdt, nodeoffset, name, val);
  	else
  		return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
  }

  int fdt_root(void *fdt)
  {
  	char *serial;
  	int err;
  
  	err = fdt_check_header(fdt);
  	if (err < 0) {
  		printf("fdt_root: %s
  ", fdt_strerror(err));
  		return err;
  	}

  	serial = env_get("serial#");

  	if (serial) {
  		err = fdt_setprop(fdt, 0, "serial-number", serial,
  				  strlen(serial) + 1);
  
  		if (err < 0) {
  			printf("WARNING: could not set serial-number %s.
  ",
  			       fdt_strerror(err));
  			return err;
  		}
  	}
  
  	return 0;
  }

  int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)

  {

  	int   nodeoffset;

  	int   err, j, total;

  	int is_u64;

  	uint64_t addr, size;

  	/* just return if the size of initrd is zero */
  	if (initrd_start == initrd_end)
  		return 0;

  	/* find or create "/chosen" node. */
  	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
  	if (nodeoffset < 0)

  		return nodeoffset;

  	total = fdt_num_mem_rsv(fdt);
  
  	/*
  	 * Look for an existing entry and update it.  If we don't find
  	 * the entry, we will j be the next available slot.
  	 */
  	for (j = 0; j < total; j++) {
  		err = fdt_get_mem_rsv(fdt, j, &addr, &size);
  		if (addr == initrd_start) {
  			fdt_del_mem_rsv(fdt, j);
  			break;

  		}

  	}

  	err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);

  	if (err < 0) {
  		printf("fdt_initrd: %s
  ", fdt_strerror(err));
  		return err;
  	}

  	is_u64 = (fdt_address_cells(fdt, 0) == 2);

  
  	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
  			      (uint64_t)initrd_start, is_u64);

  	if (err < 0) {
  		printf("WARNING: could not set linux,initrd-start %s.
  ",
  		       fdt_strerror(err));
  		return err;
  	}

  
  	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
  			      (uint64_t)initrd_end, is_u64);

  	if (err < 0) {
  		printf("WARNING: could not set linux,initrd-end %s.
  ",
  		       fdt_strerror(err));

  		return err;

  	}

  	return 0;
  }

  int fdt_chosen(void *fdt)

  {
  	int   nodeoffset;
  	int   err;
  	char  *str;		/* used to set string properties */

  
  	err = fdt_check_header(fdt);
  	if (err < 0) {
  		printf("fdt_chosen: %s
  ", fdt_strerror(err));
  		return err;
  	}

  	/* find or create "/chosen" node. */
  	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
  	if (nodeoffset < 0)
  		return nodeoffset;

  	str = env_get("bootargs");

  	if (str) {
  		err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
  				  strlen(str) + 1);
  		if (err < 0) {

  			printf("WARNING: could not set bootargs %s.
  ",
  			       fdt_strerror(err));

  			return err;
  		}

  	}

  	return fdt_fixup_stdout(fdt, nodeoffset);

  }

  void do_fixup_by_path(void *fdt, const char *path, const char *prop,
  		      const void *val, int len, int create)
  {
  #if defined(DEBUG)
  	int i;

  	debug("Updating property '%s/%s' = ", path, prop);

  	for (i = 0; i < len; i++)
  		debug(" %.2x", *(u8*)(val+i));
  	debug("
  ");
  #endif
  	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
  	if (rc)
  		printf("Unable to update property %s:%s, err=%s
  ",
  			path, prop, fdt_strerror(rc));
  }
  
  void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
  			  u32 val, int create)
  {

  	fdt32_t tmp = cpu_to_fdt32(val);
  	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);

  }

  void do_fixup_by_prop(void *fdt,
  		      const char *pname, const void *pval, int plen,
  		      const char *prop, const void *val, int len,
  		      int create)
  {
  	int off;
  #if defined(DEBUG)
  	int i;

  	debug("Updating property '%s' = ", prop);

  	for (i = 0; i < len; i++)
  		debug(" %.2x", *(u8*)(val+i));
  	debug("
  ");
  #endif
  	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
  	while (off != -FDT_ERR_NOTFOUND) {

  		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))

  			fdt_setprop(fdt, off, prop, val, len);
  		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
  	}
  }
  
  void do_fixup_by_prop_u32(void *fdt,
  			  const char *pname, const void *pval, int plen,
  			  const char *prop, u32 val, int create)
  {

  	fdt32_t tmp = cpu_to_fdt32(val);
  	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);

  }
  
  void do_fixup_by_compat(void *fdt, const char *compat,
  			const char *prop, const void *val, int len, int create)
  {
  	int off = -1;
  #if defined(DEBUG)
  	int i;

  	debug("Updating property '%s' = ", prop);

  	for (i = 0; i < len; i++)
  		debug(" %.2x", *(u8*)(val+i));
  	debug("
  ");
  #endif
  	off = fdt_node_offset_by_compatible(fdt, -1, compat);
  	while (off != -FDT_ERR_NOTFOUND) {

  		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))

  			fdt_setprop(fdt, off, prop, val, len);
  		off = fdt_node_offset_by_compatible(fdt, off, compat);
  	}
  }
  
  void do_fixup_by_compat_u32(void *fdt, const char *compat,
  			    const char *prop, u32 val, int create)
  {

  	fdt32_t tmp = cpu_to_fdt32(val);
  	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);

  }

  #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY

  /*
   * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
   */

  static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
  			int n)

  {
  	int i;

  	int address_cells = fdt_address_cells(fdt, 0);
  	int size_cells = fdt_size_cells(fdt, 0);

  	char *p = buf;
  
  	for (i = 0; i < n; i++) {

  		if (address_cells == 2)

  			*(fdt64_t *)p = cpu_to_fdt64(address[i]);
  		else
  			*(fdt32_t *)p = cpu_to_fdt32(address[i]);

  		p += 4 * address_cells;

  		if (size_cells == 2)

  			*(fdt64_t *)p = cpu_to_fdt64(size[i]);
  		else
  			*(fdt32_t *)p = cpu_to_fdt32(size[i]);

  		p += 4 * size_cells;

  	}
  
  	return p - (char *)buf;
  }

  #ifdef CONFIG_NR_DRAM_BANKS
  #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
  #else

  #define MEMORY_BANKS_MAX 4

  #endif

  int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
  {
  	int err, nodeoffset;

  	int len, i;

  	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */

  	if (banks > MEMORY_BANKS_MAX) {
  		printf("%s: num banks %d exceeds hardcoded limit %d."
  		       " Recompile with higher MEMORY_BANKS_MAX?
  ",
  		       __FUNCTION__, banks, MEMORY_BANKS_MAX);
  		return -1;
  	}

  	err = fdt_check_header(blob);
  	if (err < 0) {
  		printf("%s: %s
  ", __FUNCTION__, fdt_strerror(err));
  		return err;
  	}

  	/* find or create "/memory" node. */
  	nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
  	if (nodeoffset < 0)

  			return nodeoffset;

  	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
  			sizeof("memory"));
  	if (err < 0) {
  		printf("WARNING: could not set %s %s.
  ", "device_type",
  				fdt_strerror(err));
  		return err;
  	}

  	for (i = 0; i < banks; i++) {
  		if (start[i] == 0 && size[i] == 0)
  			break;
  	}
  
  	banks = i;

  	if (!banks)
  		return 0;

  	for (i = 0; i < banks; i++)
  		if (start[i] == 0 && size[i] == 0)
  			break;
  
  	banks = i;

  	len = fdt_pack_reg(blob, tmp, start, size, banks);

  
  	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
  	if (err < 0) {
  		printf("WARNING: could not set %s %s.
  ",
  				"reg", fdt_strerror(err));
  		return err;
  	}
  	return 0;
  }

  #endif

  int fdt_fixup_memory(void *blob, u64 start, u64 size)
  {
  	return fdt_fixup_memory_banks(blob, &start, &size, 1);
  }

  void fdt_fixup_ethernet(void *fdt)

  {

  	int i = 0, j, prop;

  	char *tmp, *end;

  	char mac[16];

  	const char *path;

  	unsigned char mac_addr[ARP_HLEN];

  	int offset;

  #ifdef FDT_SEQ_MACADDR_FROM_ENV
  	int nodeoff;
  	const struct fdt_property *fdt_prop;
  #endif

  	if (fdt_path_offset(fdt, "/aliases") < 0)

  		return;

  	/* Cycle through all aliases */
  	for (prop = 0; ; prop++) {

  		const char *name;

  		/* FDT might have been edited, recompute the offset */
  		offset = fdt_first_property_offset(fdt,
  			fdt_path_offset(fdt, "/aliases"));
  		/* Select property number 'prop' */

  		for (j = 0; j < prop; j++)

  			offset = fdt_next_property_offset(fdt, offset);
  
  		if (offset < 0)
  			break;

  		path = fdt_getprop_by_offset(fdt, offset, &name, NULL);

  		if (!strncmp(name, "ethernet", 8)) {
  			/* Treat plain "ethernet" same as "ethernet0". */

  			if (!strcmp(name, "ethernet")
  #ifdef FDT_SEQ_MACADDR_FROM_ENV
  			 || !strcmp(name, "ethernet0")
  #endif
  			)

  				i = 0;

  #ifndef FDT_SEQ_MACADDR_FROM_ENV

  			else
  				i = trailing_strtol(name);

  #endif

  			if (i != -1) {
  				if (i == 0)
  					strcpy(mac, "ethaddr");
  				else
  					sprintf(mac, "eth%daddr", i);
  			} else {
  				continue;
  			}

  #ifdef FDT_SEQ_MACADDR_FROM_ENV
  			nodeoff = fdt_path_offset(fdt, path);
  			fdt_prop = fdt_get_property(fdt, nodeoff, "status",
  						    NULL);
  			if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
  				continue;
  			i++;
  #endif

  			tmp = env_get(mac);

  			if (!tmp)
  				continue;
  
  			for (j = 0; j < 6; j++) {
  				mac_addr[j] = tmp ?
  					      simple_strtoul(tmp, &end, 16) : 0;
  				if (tmp)
  					tmp = (*end) ? end + 1 : end;
  			}
  
  			do_fixup_by_path(fdt, path, "mac-address",
  					 &mac_addr, 6, 0);
  			do_fixup_by_path(fdt, path, "local-mac-address",
  					 &mac_addr, 6, 1);

  		}

  	}
  }

  int fdt_record_loadable(void *blob, u32 index, const char *name,
  			uintptr_t load_addr, u32 size, uintptr_t entry_point,
  			const char *type, const char *os)
  {
  	int err, node;
  
  	err = fdt_check_header(blob);
  	if (err < 0) {
  		printf("%s: %s
  ", __func__, fdt_strerror(err));
  		return err;
  	}
  
  	/* find or create "/fit-images" node */
  	node = fdt_find_or_add_subnode(blob, 0, "fit-images");
  	if (node < 0)
  		return node;
  
  	/* find or create "/fit-images/<name>" node */
  	node = fdt_find_or_add_subnode(blob, node, name);
  	if (node < 0)
  		return node;
  
  	/*
  	 * We record these as 32bit entities, possibly truncating addresses.
  	 * However, spl_fit.c is not 64bit safe either: i.e. we should not
  	 * have an issue here.
  	 */
  	fdt_setprop_u32(blob, node, "load-addr", load_addr);
  	if (entry_point != -1)
  		fdt_setprop_u32(blob, node, "entry-point", entry_point);
  	fdt_setprop_u32(blob, node, "size", size);
  	if (type)
  		fdt_setprop_string(blob, node, "type", type);
  	if (os)
  		fdt_setprop_string(blob, node, "os", os);
  
  	return node;
  }

  /* Resize the fdt to its actual size + a bit of padding */

  int fdt_shrink_to_minimum(void *blob, uint extrasize)

  {
  	int i;
  	uint64_t addr, size;
  	int total, ret;
  	uint actualsize;
  
  	if (!blob)
  		return 0;
  
  	total = fdt_num_mem_rsv(blob);
  	for (i = 0; i < total; i++) {
  		fdt_get_mem_rsv(blob, i, &addr, &size);

  		if (addr == (uintptr_t)blob) {

  			fdt_del_mem_rsv(blob, i);
  			break;
  		}
  	}

  	/*
  	 * Calculate the actual size of the fdt

  	 * plus the size needed for 5 fdt_add_mem_rsv, one
  	 * for the fdt itself and 4 for a possible initrd
  	 * ((initrd-start + initrd-end) * 2 (name & value))

  	 */

  	actualsize = fdt_off_dt_strings(blob) +

  		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);

  	actualsize += extrasize;

  	/* Make it so the fdt ends on a page boundary */

  	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
  	actualsize = actualsize - ((uintptr_t)blob & 0xfff);

  
  	/* Change the fdt header to reflect the correct size */
  	fdt_set_totalsize(blob, actualsize);
  
  	/* Add the new reservation */

  	ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);

  	if (ret < 0)
  		return ret;
  
  	return actualsize;
  }

  
  #ifdef CONFIG_PCI

  #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4

  
  #define FDT_PCI_PREFETCH	(0x40000000)
  #define FDT_PCI_MEM32		(0x02000000)
  #define FDT_PCI_IO		(0x01000000)
  #define FDT_PCI_MEM64		(0x03000000)
  
  int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
  
  	int addrcell, sizecell, len, r;
  	u32 *dma_range;
  	/* sized based on pci addr cells, size-cells, & address-cells */
  	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
  
  	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
  	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
  
  	dma_range = &dma_ranges[0];
  	for (r = 0; r < hose->region_count; r++) {
  		u64 bus_start, phys_start, size;

  		/* skip if !PCI_REGION_SYS_MEMORY */
  		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))

  			continue;
  
  		bus_start = (u64)hose->regions[r].bus_start;
  		phys_start = (u64)hose->regions[r].phys_start;
  		size = (u64)hose->regions[r].size;
  
  		dma_range[0] = 0;

  		if (size >= 0x100000000ull)

  			dma_range[0] |= FDT_PCI_MEM64;
  		else
  			dma_range[0] |= FDT_PCI_MEM32;
  		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
  			dma_range[0] |= FDT_PCI_PREFETCH;
  #ifdef CONFIG_SYS_PCI_64BIT
  		dma_range[1] = bus_start >> 32;
  #else
  		dma_range[1] = 0;
  #endif
  		dma_range[2] = bus_start & 0xffffffff;
  
  		if (addrcell == 2) {
  			dma_range[3] = phys_start >> 32;
  			dma_range[4] = phys_start & 0xffffffff;
  		} else {
  			dma_range[3] = phys_start & 0xffffffff;
  		}
  
  		if (sizecell == 2) {
  			dma_range[3 + addrcell + 0] = size >> 32;
  			dma_range[3 + addrcell + 1] = size & 0xffffffff;
  		} else {
  			dma_range[3 + addrcell + 0] = size & 0xffffffff;
  		}
  
  		dma_range += (3 + addrcell + sizecell);
  	}
  
  	len = dma_range - &dma_ranges[0];
  	if (len)
  		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
  
  	return 0;
  }
  #endif

  int fdt_increase_size(void *fdt, int add_len)
  {
  	int newlen;
  
  	newlen = fdt_totalsize(fdt) + add_len;
  
  	/* Open in place with a new len */
  	return fdt_open_into(fdt, fdt, newlen);
  }

  #ifdef CONFIG_FDT_FIXUP_PARTITIONS
  #include <jffs2/load_kernel.h>
  #include <mtd_node.h>
  
  struct reg_cell {
  	unsigned int r0;
  	unsigned int r1;
  };
  
  int fdt_del_subnodes(const void *blob, int parent_offset)
  {
  	int off, ndepth;
  	int ret;
  
  	for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
  	     (off >= 0) && (ndepth > 0);
  	     off = fdt_next_node(blob, off, &ndepth)) {
  		if (ndepth == 1) {
  			debug("delete %s: offset: %x
  ",
  				fdt_get_name(blob, off, 0), off);
  			ret = fdt_del_node((void *)blob, off);
  			if (ret < 0) {
  				printf("Can't delete node: %s
  ",
  					fdt_strerror(ret));
  				return ret;
  			} else {
  				ndepth = 0;
  				off = parent_offset;
  			}
  		}
  	}
  	return 0;
  }

  int fdt_del_partitions(void *blob, int parent_offset)
  {
  	const void *prop;
  	int ndepth = 0;
  	int off;
  	int ret;
  
  	off = fdt_next_node(blob, parent_offset, &ndepth);
  	if (off > 0 && ndepth == 1) {
  		prop = fdt_getprop(blob, off, "label", NULL);
  		if (prop == NULL) {
  			/*
  			 * Could not find label property, nand {}; node?
  			 * Check subnode, delete partitions there if any.
  			 */
  			return fdt_del_partitions(blob, off);
  		} else {
  			ret = fdt_del_subnodes(blob, parent_offset);
  			if (ret < 0) {
  				printf("Can't remove subnodes: %s
  ",
  					fdt_strerror(ret));
  				return ret;
  			}
  		}
  	}
  	return 0;
  }
  
  int fdt_node_set_part_info(void *blob, int parent_offset,
  			   struct mtd_device *dev)
  {
  	struct list_head *pentry;
  	struct part_info *part;
  	struct reg_cell cell;
  	int off, ndepth = 0;
  	int part_num, ret;
  	char buf[64];
  
  	ret = fdt_del_partitions(blob, parent_offset);
  	if (ret < 0)
  		return ret;
  
  	/*
  	 * Check if it is nand {}; subnode, adjust
  	 * the offset in this case
  	 */
  	off = fdt_next_node(blob, parent_offset, &ndepth);
  	if (off > 0 && ndepth == 1)
  		parent_offset = off;
  
  	part_num = 0;
  	list_for_each_prev(pentry, &dev->parts) {
  		int newoff;
  
  		part = list_entry(pentry, struct part_info, link);

  		debug("%2d: %-20s0x%08llx\t0x%08llx\t%d
  ",

  			part_num, part->name, part->size,
  			part->offset, part->mask_flags);

  		sprintf(buf, "partition@%llx", part->offset);

  add_sub:
  		ret = fdt_add_subnode(blob, parent_offset, buf);
  		if (ret == -FDT_ERR_NOSPACE) {
  			ret = fdt_increase_size(blob, 512);
  			if (!ret)
  				goto add_sub;
  			else
  				goto err_size;
  		} else if (ret < 0) {
  			printf("Can't add partition node: %s
  ",
  				fdt_strerror(ret));
  			return ret;
  		}
  		newoff = ret;
  
  		/* Check MTD_WRITEABLE_CMD flag */
  		if (part->mask_flags & 1) {
  add_ro:
  			ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
  			if (ret == -FDT_ERR_NOSPACE) {
  				ret = fdt_increase_size(blob, 512);
  				if (!ret)
  					goto add_ro;
  				else
  					goto err_size;
  			} else if (ret < 0)
  				goto err_prop;
  		}
  
  		cell.r0 = cpu_to_fdt32(part->offset);
  		cell.r1 = cpu_to_fdt32(part->size);
  add_reg:
  		ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
  		if (ret == -FDT_ERR_NOSPACE) {
  			ret = fdt_increase_size(blob, 512);
  			if (!ret)
  				goto add_reg;
  			else
  				goto err_size;
  		} else if (ret < 0)
  			goto err_prop;
  
  add_label:
  		ret = fdt_setprop_string(blob, newoff, "label", part->name);
  		if (ret == -FDT_ERR_NOSPACE) {
  			ret = fdt_increase_size(blob, 512);
  			if (!ret)
  				goto add_label;
  			else
  				goto err_size;
  		} else if (ret < 0)
  			goto err_prop;
  
  		part_num++;
  	}
  	return 0;
  err_size:
  	printf("Can't increase blob size: %s
  ", fdt_strerror(ret));
  	return ret;
  err_prop:
  	printf("Can't add property: %s
  ", fdt_strerror(ret));
  	return ret;
  }
  
  /*
   * Update partitions in nor/nand nodes using info from
   * mtdparts environment variable. The nodes to update are
   * specified by node_info structure which contains mtd device
   * type and compatible string: E. g. the board code in
   * ft_board_setup() could use:
   *
   *	struct node_info nodes[] = {
   *		{ "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
   *		{ "cfi-flash",          MTD_DEV_TYPE_NOR,  },
   *	};
   *
   *	fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
   */
  void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
  {
  	struct node_info *ni = node_info;
  	struct mtd_device *dev;

  	int i, idx;
  	int noff;

  	if (mtdparts_init() != 0)
  		return;
  
  	for (i = 0; i < node_info_size; i++) {
  		idx = 0;
  		noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
  		while (noff != -FDT_ERR_NOTFOUND) {
  			debug("%s: %s, mtd dev type %d
  ",
  				fdt_get_name(blob, noff, 0),
  				ni[i].compat, ni[i].type);
  			dev = device_find(ni[i].type, idx++);
  			if (dev) {
  				if (fdt_node_set_part_info(blob, noff, dev))
  					return; /* return on error */
  			}
  
  			/* Jump to next flash node */
  			noff = fdt_node_offset_by_compatible(blob, noff,
  							     ni[i].compat);
  		}
  	}
  }
  #endif

  
  void fdt_del_node_and_alias(void *blob, const char *alias)
  {
  	int off = fdt_path_offset(blob, alias);
  
  	if (off < 0)
  		return;
  
  	fdt_del_node(blob, off);
  
  	off = fdt_path_offset(blob, "/aliases");
  	fdt_delprop(blob, off, alias);
  }

  /* Max address size we deal with */
  #define OF_MAX_ADDR_CELLS	4

  #define OF_BAD_ADDR	FDT_ADDR_T_NONE

  #define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
  			(ns) > 0)

  
  /* Debug utility */
  #ifdef DEBUG

  static void of_dump_addr(const char *s, const fdt32_t *addr, int na)

  {
  	printf("%s", s);
  	while(na--)
  		printf(" %08x", *(addr++));
  	printf("
  ");
  }
  #else

  static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }

  #endif

  /**
   * struct of_bus - Callbacks for bus specific translators

   * @name:	A string used to identify this bus in debug output.
   * @addresses:	The name of the DT property from which addresses are
   *		to be read, typically "reg".

   * @match:	Return non-zero if the node whose parent is at
   *		parentoffset in the FDT blob corresponds to a bus
   *		of this type, otherwise return zero. If NULL a match
   *		is assumed.

   * @count_cells:Count how many cells (be32 values) a node whose parent
   *		is at parentoffset in the FDT blob will require to
   *		represent its address (written to *addrc) & size
   *		(written to *sizec).
   * @map:	Map the address addr from the address space of this
   *		bus to that of its parent, making use of the ranges
   *		read from DT to an array at range. na and ns are the
   *		number of cells (be32 values) used to hold and address
   *		or size, respectively, for this bus. pna is the number
   *		of cells used to hold an address for the parent bus.
   *		Returns the address in the address space of the parent
   *		bus.
   * @translate:	Update the value of the address cells at addr within an
   *		FDT by adding offset to it. na specifies the number of
   *		cells used to hold the address being translated. Returns
   *		zero on success, non-zero on error.

   *
   * Each bus type will include a struct of_bus in the of_busses array,
   * providing implementations of some or all of the functions used to
   * match the bus & handle address translation for its children.
   */

  struct of_bus {
  	const char	*name;
  	const char	*addresses;

  	int		(*match)(const void *blob, int parentoffset);
  	void		(*count_cells)(const void *blob, int parentoffset,

  				int *addrc, int *sizec);

  	u64		(*map)(fdt32_t *addr, const fdt32_t *range,

  				int na, int ns, int pna);

  	int		(*translate)(fdt32_t *addr, u64 offset, int na);

  };
  
  /* Default translator (generic bus) */

  void fdt_support_default_count_cells(const void *blob, int parentoffset,

  					int *addrc, int *sizec)
  {

  	const fdt32_t *prop;

  	if (addrc)
  		*addrc = fdt_address_cells(blob, parentoffset);

  
  	if (sizec) {
  		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
  		if (prop)

  			*sizec = be32_to_cpup(prop);

  		else
  			*sizec = 1;
  	}

  }

  static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,

  		int na, int ns, int pna)
  {
  	u64 cp, s, da;

  	cp = fdt_read_number(range, na);
  	s  = fdt_read_number(range + na + pna, ns);
  	da = fdt_read_number(addr, na);

  	debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
  	      ", da=%" PRIu64 "
  ", cp, s, da);

  
  	if (da < cp || da >= (cp + s))
  		return OF_BAD_ADDR;
  	return da - cp;
  }

  static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)

  {

  	u64 a = fdt_read_number(addr, na);

  	memset(addr, 0, na * 4);
  	a += offset;
  	if (na > 1)

  		addr[na - 2] = cpu_to_fdt32(a >> 32);
  	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);

  
  	return 0;
  }

  #ifdef CONFIG_OF_ISA_BUS
  
  /* ISA bus translator */

  static int of_bus_isa_match(const void *blob, int parentoffset)

  {
  	const char *name;
  
  	name = fdt_get_name(blob, parentoffset, NULL);
  	if (!name)
  		return 0;
  
  	return !strcmp(name, "isa");
  }

  static void of_bus_isa_count_cells(const void *blob, int parentoffset,

  				   int *addrc, int *sizec)
  {
  	if (addrc)
  		*addrc = 2;
  	if (sizec)
  		*sizec = 1;
  }
  
  static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
  			  int na, int ns, int pna)
  {
  	u64 cp, s, da;
  
  	/* Check address type match */
  	if ((addr[0] ^ range[0]) & cpu_to_be32(1))
  		return OF_BAD_ADDR;

  	cp = fdt_read_number(range + 1, na - 1);
  	s  = fdt_read_number(range + na + pna, ns);
  	da = fdt_read_number(addr + 1, na - 1);

  
  	debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64
  	      ", da=%" PRIu64 "
  ", cp, s, da);
  
  	if (da < cp || da >= (cp + s))
  		return OF_BAD_ADDR;
  	return da - cp;
  }
  
  static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
  {
  	return of_bus_default_translate(addr + 1, offset, na - 1);
  }
  
  #endif /* CONFIG_OF_ISA_BUS */

  /* Array of bus specific translators */
  static struct of_bus of_busses[] = {

  #ifdef CONFIG_OF_ISA_BUS
  	/* ISA */
  	{
  		.name = "isa",
  		.addresses = "reg",
  		.match = of_bus_isa_match,
  		.count_cells = of_bus_isa_count_cells,
  		.map = of_bus_isa_map,
  		.translate = of_bus_isa_translate,
  	},
  #endif /* CONFIG_OF_ISA_BUS */

  	/* Default */
  	{
  		.name = "default",
  		.addresses = "reg",

  		.count_cells = fdt_support_default_count_cells,

  		.map = of_bus_default_map,
  		.translate = of_bus_default_translate,
  	},
  };

  static struct of_bus *of_match_bus(const void *blob, int parentoffset)

  {
  	struct of_bus *bus;
  
  	if (ARRAY_SIZE(of_busses) == 1)
  		return of_busses;
  
  	for (bus = of_busses; bus; bus++) {
  		if (!bus->match || bus->match(blob, parentoffset))
  			return bus;
  	}
  
  	/*
  	 * We should always have matched the default bus at least, since
  	 * it has a NULL match field. If we didn't then it somehow isn't
  	 * in the of_busses array or something equally catastrophic has
  	 * gone wrong.
  	 */
  	assert(0);
  	return NULL;
  }

  static int of_translate_one(const void *blob, int parent, struct of_bus *bus,

  			    struct of_bus *pbus, fdt32_t *addr,

  			    int na, int ns, int pna, const char *rprop)
  {

  	const fdt32_t *ranges;

  	int rlen;
  	int rone;
  	u64 offset = OF_BAD_ADDR;
  
  	/* Normally, an absence of a "ranges" property means we are
  	 * crossing a non-translatable boundary, and thus the addresses
  	 * below the current not cannot be converted to CPU physical ones.
  	 * Unfortunately, while this is very clear in the spec, it's not
  	 * what Apple understood, and they do have things like /uni-n or
  	 * /ht nodes with no "ranges" property and a lot of perfectly
  	 * useable mapped devices below them. Thus we treat the absence of
  	 * "ranges" as equivalent to an empty "ranges" property which means
  	 * a 1:1 translation at that level. It's up to the caller not to try
  	 * to translate addresses that aren't supposed to be translated in
  	 * the first place. --BenH.
  	 */

  	ranges = fdt_getprop(blob, parent, rprop, &rlen);

  	if (ranges == NULL || rlen == 0) {

  		offset = fdt_read_number(addr, na);

  		memset(addr, 0, pna * 4);
  		debug("OF: no ranges, 1:1 translation
  ");
  		goto finish;
  	}
  
  	debug("OF: walking ranges...
  ");
  
  	/* Now walk through the ranges */
  	rlen /= 4;
  	rone = na + pna + ns;
  	for (; rlen >= rone; rlen -= rone, ranges += rone) {
  		offset = bus->map(addr, ranges, na, ns, pna);
  		if (offset != OF_BAD_ADDR)
  			break;
  	}
  	if (offset == OF_BAD_ADDR) {
  		debug("OF: not found !
  ");
  		return 1;
  	}
  	memcpy(addr, ranges + na, 4 * pna);
  
   finish:
  	of_dump_addr("OF: parent translation for:", addr, pna);

  	debug("OF: with offset: %" PRIu64 "
  ", offset);

  
  	/* Translate it into parent bus space */
  	return pbus->translate(addr, offset, pna);
  }
  
  /*
   * Translate an address from the device-tree into a CPU physical address,
   * this walks up the tree and applies the various bus mappings on the
   * way.
   *
   * Note: We consider that crossing any level with #size-cells == 0 to mean
   * that translation is impossible (that is we are not dealing with a value
   * that can be mapped to a cpu physical address). This is not really specified
   * that way, but this is traditionally the way IBM at least do things
   */

  static u64 __of_translate_address(const void *blob, int node_offset,
  				  const fdt32_t *in_addr, const char *rprop)

  {
  	int parent;
  	struct of_bus *bus, *pbus;

  	fdt32_t addr[OF_MAX_ADDR_CELLS];

  	int na, ns, pna, pns;
  	u64 result = OF_BAD_ADDR;
  
  	debug("OF: ** translation for device %s **
  ",
  		fdt_get_name(blob, node_offset, NULL));
  
  	/* Get parent & match bus type */
  	parent = fdt_parent_offset(blob, node_offset);
  	if (parent < 0)
  		goto bail;

  	bus = of_match_bus(blob, parent);

  
  	/* Cound address cells & copy address locally */

  	bus->count_cells(blob, parent, &na, &ns);

  	if (!OF_CHECK_COUNTS(na, ns)) {

  		printf("%s: Bad cell count for %s
  ", __FUNCTION__,
  		       fdt_get_name(blob, node_offset, NULL));
  		goto bail;
  	}
  	memcpy(addr, in_addr, na * 4);
  
  	debug("OF: bus is %s (na=%d, ns=%d) on %s
  ",
  	    bus->name, na, ns, fdt_get_name(blob, parent, NULL));
  	of_dump_addr("OF: translating address:", addr, na);
  
  	/* Translate */
  	for (;;) {
  		/* Switch to parent bus */
  		node_offset = parent;
  		parent = fdt_parent_offset(blob, node_offset);
  
  		/* If root, we have finished */
  		if (parent < 0) {
  			debug("OF: reached root node
  ");

  			result = fdt_read_number(addr, na);

  			break;
  		}
  
  		/* Get new parent bus and counts */

  		pbus = of_match_bus(blob, parent);

  		pbus->count_cells(blob, parent, &pna, &pns);

  		if (!OF_CHECK_COUNTS(pna, pns)) {

  			printf("%s: Bad cell count for %s
  ", __FUNCTION__,
  				fdt_get_name(blob, node_offset, NULL));
  			break;
  		}
  
  		debug("OF: parent bus is %s (na=%d, ns=%d) on %s
  ",
  		    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
  
  		/* Apply bus translation */
  		if (of_translate_one(blob, node_offset, bus, pbus,
  					addr, na, ns, pna, rprop))
  			break;
  
  		/* Complete the move up one level */
  		na = pna;
  		ns = pns;
  		bus = pbus;
  
  		of_dump_addr("OF: one level translation:", addr, na);
  	}
   bail:
  
  	return result;
  }

  u64 fdt_translate_address(const void *blob, int node_offset,
  			  const fdt32_t *in_addr)

  {
  	return __of_translate_address(blob, node_offset, in_addr, "ranges");
  }

  
  /**
   * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
   * who's reg property matches a physical cpu address
   *
   * @blob: ptr to device tree
   * @compat: compatiable string to match
   * @compat_off: property name
   *
   */
  int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
  					phys_addr_t compat_off)
  {
  	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
  	while (off != -FDT_ERR_NOTFOUND) {

  		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);

  		if (reg) {
  			if (compat_off == fdt_translate_address(blob, off, reg))
  				return off;
  		}
  		off = fdt_node_offset_by_compatible(blob, off, compat);
  	}
  
  	return -FDT_ERR_NOTFOUND;
  }

  /**
   * fdt_alloc_phandle: Return next free phandle value
   *
   * @blob: ptr to device tree
   */
  int fdt_alloc_phandle(void *blob)
  {

  	int offset;
  	uint32_t phandle = 0;

  
  	for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
  	     offset = fdt_next_node(blob, offset, NULL)) {

  		phandle = max(phandle, fdt_get_phandle(blob, offset));

  	}

  	return phandle + 1;
  }

  /*

   * fdt_set_phandle: Create a phandle property for the given node

   *
   * @fdt: ptr to device tree
   * @nodeoffset: node to update
   * @phandle: phandle value to set (must be unique)

   */
  int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)

  {
  	int ret;
  
  #ifdef DEBUG
  	int off = fdt_node_offset_by_phandle(fdt, phandle);
  
  	if ((off >= 0) && (off != nodeoffset)) {
  		char buf[64];
  
  		fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
  		printf("Trying to update node %s with phandle %u ",
  		       buf, phandle);
  
  		fdt_get_path(fdt, off, buf, sizeof(buf));
  		printf("that already exists in node %s.
  ", buf);
  		return -FDT_ERR_BADPHANDLE;
  	}
  #endif
  
  	ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
  	if (ret < 0)
  		return ret;
  
  	/*
  	 * For now, also set the deprecated "linux,phandle" property, so that we
  	 * don't break older kernels.
  	 */
  	ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
  
  	return ret;
  }

  /*
   * fdt_create_phandle: Create a phandle property for the given node
   *
   * @fdt: ptr to device tree
   * @nodeoffset: node to update
   */

  unsigned int fdt_create_phandle(void *fdt, int nodeoffset)

  {
  	/* see if there is a phandle already */
  	int phandle = fdt_get_phandle(fdt, nodeoffset);
  
  	/* if we got 0, means no phandle so create one */
  	if (phandle == 0) {

  		int ret;

  		phandle = fdt_alloc_phandle(fdt);

  		ret = fdt_set_phandle(fdt, nodeoffset, phandle);
  		if (ret < 0) {
  			printf("Can't set phandle %u: %s
  ", phandle,
  			       fdt_strerror(ret));
  			return 0;
  		}

  	}
  
  	return phandle;
  }

  /*
   * fdt_set_node_status: Set status for the given node
   *
   * @fdt: ptr to device tree
   * @nodeoffset: node to update
   * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
   *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
   * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
   */
  int fdt_set_node_status(void *fdt, int nodeoffset,
  			enum fdt_status status, unsigned int error_code)
  {
  	char buf[16];
  	int ret = 0;
  
  	if (nodeoffset < 0)
  		return nodeoffset;
  
  	switch (status) {
  	case FDT_STATUS_OKAY:
  		ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
  		break;
  	case FDT_STATUS_DISABLED:
  		ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
  		break;
  	case FDT_STATUS_FAIL:
  		ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
  		break;
  	case FDT_STATUS_FAIL_ERROR_CODE:
  		sprintf(buf, "fail-%d", error_code);
  		ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
  		break;
  	default:
  		printf("Invalid fdt status: %x
  ", status);
  		ret = -1;
  		break;
  	}
  
  	return ret;
  }
  
  /*
   * fdt_set_status_by_alias: Set status for the given node given an alias
   *
   * @fdt: ptr to device tree
   * @alias: alias of node to update
   * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
   *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
   * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
   */
  int fdt_set_status_by_alias(void *fdt, const char* alias,
  			    enum fdt_status status, unsigned int error_code)
  {
  	int offset = fdt_path_offset(fdt, alias);
  
  	return fdt_set_node_status(fdt, offset, status, error_code);
  }

  #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)

  int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
  {
  	int noff;
  	int ret;
  
  	noff = fdt_node_offset_by_compatible(blob, -1, compat);
  	if (noff != -FDT_ERR_NOTFOUND) {
  		debug("%s: %s
  ", fdt_get_name(blob, noff, 0), compat);
  add_edid:
  		ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
  		if (ret == -FDT_ERR_NOSPACE) {
  			ret = fdt_increase_size(blob, 512);
  			if (!ret)
  				goto add_edid;
  			else
  				goto err_size;
  		} else if (ret < 0) {
  			printf("Can't add property: %s
  ", fdt_strerror(ret));
  			return ret;
  		}
  	}
  	return 0;
  err_size:
  	printf("Can't increase blob size: %s
  ", fdt_strerror(ret));
  	return ret;
  }
  #endif

  
  /*
   * Verify the physical address of device tree node for a given alias
   *
   * This function locates the device tree node of a given alias, and then
   * verifies that the physical address of that device matches the given
   * parameter.  It displays a message if there is a mismatch.
   *
   * Returns 1 on success, 0 on failure
   */
  int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
  {
  	const char *path;

  	const fdt32_t *reg;

  	int node, len;
  	u64 dt_addr;
  
  	path = fdt_getprop(fdt, anode, alias, NULL);
  	if (!path) {
  		/* If there's no such alias, then it's not a failure */
  		return 1;
  	}
  
  	node = fdt_path_offset(fdt, path);
  	if (node < 0) {
  		printf("Warning: device tree alias '%s' points to invalid "
  		       "node %s.
  ", alias, path);
  		return 0;
  	}
  
  	reg = fdt_getprop(fdt, node, "reg", &len);
  	if (!reg) {
  		printf("Warning: device tree node '%s' has no address.
  ",
  		       path);
  		return 0;
  	}
  
  	dt_addr = fdt_translate_address(fdt, node, reg);
  	if (addr != dt_addr) {

  		printf("Warning: U-Boot configured device %s at address %"
  		       PRIx64 ",
   but the device tree has it address %"
  		       PRIx64 ".
  ", alias, addr, dt_addr);

  		return 0;
  	}
  
  	return 1;
  }
  
  /*
   * Returns the base address of an SOC or PCI node
   */

  u64 fdt_get_base_address(const void *fdt, int node)

  {
  	int size;

  	const fdt32_t *prop;

  	prop = fdt_getprop(fdt, node, "reg", &size);

  	return prop ? fdt_translate_address(fdt, node, prop) : 0;

  }

  
  /*
   * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
   */
  static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
  			 uint64_t *val, int cells)
  {
  	const fdt32_t *prop32 = &prop[cell_off];
  	const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
  
  	if ((cell_off + cells) > prop_len)
  		return -FDT_ERR_NOSPACE;
  
  	switch (cells) {
  	case 1:
  		*val = fdt32_to_cpu(*prop32);
  		break;
  	case 2:
  		*val = fdt64_to_cpu(*prop64);
  		break;
  	default:
  		return -FDT_ERR_NOSPACE;
  	}
  
  	return 0;
  }
  
  /**
   * fdt_read_range - Read a node's n'th range property
   *
   * @fdt: ptr to device tree
   * @node: offset of node
   * @n: range index
   * @child_addr: pointer to storage for the "child address" field
   * @addr: pointer to storage for the CPU view translated physical start
   * @len: pointer to storage for the range length
   *
   * Convenience function that reads and interprets a specific range out of
   * a number of the "ranges" property array.
   */
  int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
  		   uint64_t *addr, uint64_t *len)
  {
  	int pnode = fdt_parent_offset(fdt, node);
  	const fdt32_t *ranges;
  	int pacells;
  	int acells;
  	int scells;
  	int ranges_len;
  	int cell = 0;
  	int r = 0;
  
  	/*
  	 * The "ranges" property is an array of
  	 * { <child address> <parent address> <size in child address space> }
  	 *
  	 * All 3 elements can span a diffent number of cells. Fetch their size.
  	 */
  	pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
  	acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
  	scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
  
  	/* Now try to get the ranges property */
  	ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
  	if (!ranges)
  		return -FDT_ERR_NOTFOUND;
  	ranges_len /= sizeof(uint32_t);
  
  	/* Jump to the n'th entry */
  	cell = n * (pacells + acells + scells);
  
  	/* Read <child address> */
  	if (child_addr) {
  		r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
  				  acells);
  		if (r)
  			return r;
  	}
  	cell += acells;
  
  	/* Read <parent address> */
  	if (addr)
  		*addr = fdt_translate_address(fdt, node, ranges + cell);
  	cell += pacells;
  
  	/* Read <size in child address space> */
  	if (len) {
  		r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
  		if (r)
  			return r;
  	}
  
  	return 0;
  }

  
  /**
   * fdt_setup_simplefb_node - Fill and enable a simplefb node
   *
   * @fdt: ptr to device tree
   * @node: offset of the simplefb node
   * @base_address: framebuffer base address
   * @width: width in pixels
   * @height: height in pixels
   * @stride: bytes per line
   * @format: pixel format string
   *
   * Convenience function to fill and enable a simplefb node.
   */
  int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
  			    u32 height, u32 stride, const char *format)
  {
  	char name[32];
  	fdt32_t cells[4];
  	int i, addrc, sizec, ret;

  	fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
  					&addrc, &sizec);

  	i = 0;
  	if (addrc == 2)
  		cells[i++] = cpu_to_fdt32(base_address >> 32);
  	cells[i++] = cpu_to_fdt32(base_address);
  	if (sizec == 2)
  		cells[i++] = 0;
  	cells[i++] = cpu_to_fdt32(height * stride);
  
  	ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
  	if (ret < 0)
  		return ret;

  	snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);

  	ret = fdt_set_name(fdt, node, name);
  	if (ret < 0)
  		return ret;
  
  	ret = fdt_setprop_u32(fdt, node, "width", width);
  	if (ret < 0)
  		return ret;
  
  	ret = fdt_setprop_u32(fdt, node, "height", height);
  	if (ret < 0)
  		return ret;
  
  	ret = fdt_setprop_u32(fdt, node, "stride", stride);
  	if (ret < 0)
  		return ret;
  
  	ret = fdt_setprop_string(fdt, node, "format", format);
  	if (ret < 0)
  		return ret;
  
  	ret = fdt_setprop_string(fdt, node, "status", "okay");
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }

  
  /*
   * Update native-mode in display-timings from display environment variable.
   * The node to update are specified by path.
   */
  int fdt_fixup_display(void *blob, const char *path, const char *display)
  {
  	int off, toff;
  
  	if (!display || !path)
  		return -FDT_ERR_NOTFOUND;
  
  	toff = fdt_path_offset(blob, path);
  	if (toff >= 0)
  		toff = fdt_subnode_offset(blob, toff, "display-timings");
  	if (toff < 0)
  		return toff;
  
  	for (off = fdt_first_subnode(blob, toff);
  	     off >= 0;
  	     off = fdt_next_subnode(blob, off)) {
  		uint32_t h = fdt_get_phandle(blob, off);
  		debug("%s:0x%x
  ", fdt_get_name(blob, off, NULL),
  		      fdt32_to_cpu(h));
  		if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
  			return fdt_setprop_u32(blob, toff, "native-mode", h);
  	}
  	return toff;
  }

  
  #ifdef CONFIG_OF_LIBFDT_OVERLAY
  /**
   * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
   *
   * @fdt: ptr to device tree
   * @fdto: ptr to device tree overlay
   *
   * Convenience function to apply an overlay and display helpful messages
   * in the case of an error
   */
  int fdt_overlay_apply_verbose(void *fdt, void *fdto)
  {
  	int err;
  	bool has_symbols;
  
  	err = fdt_path_offset(fdt, "/__symbols__");
  	has_symbols = err >= 0;
  
  	err = fdt_overlay_apply(fdt, fdto);
  	if (err < 0) {
  		printf("failed on fdt_overlay_apply(): %s
  ",
  				fdt_strerror(err));
  		if (!has_symbols) {
  			printf("base fdt does did not have a /__symbols__ node
  ");
  			printf("make sure you've compiled with -@
  ");
  		}
  	}
  	return err;
  }
  #endif