X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=libfdt%2Ffdt_ro.c;h=11d80d2fa249d8a6085888e48b44130d6f7ca531;hb=27f33e9f45ef7f9685cbdc65066a1828e85dde4f;hp=4e2c325b4d5590615b1aa329d89d2cf86da09079;hpb=3c4bd60de15d79ddfc0cf3170a55847b2025d93f;p=u-boot

diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index 4e2c325b4d..11d80d2fa2 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -2,37 +2,67 @@
  * libfdt - Flat Device Tree manipulation
  * Copyright (C) 2006 David Gibson, IBM Corporation.
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * as published by the Free Software Foundation; either version 2.1 of
- * the License, or (at your option) any later version.
+ * libfdt is dual licensed: you can use it either under the terms of
+ * the GPL, or the BSD license, at your option.
  *
- * This library is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
+ *  a) This library 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.
  *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *     This library is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public
+ *     License along with this library; if not, write to the Free
+ *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ *     MA 02110-1301 USA
+ *
+ * Alternatively,
+ *
+ *  b) Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *     2. Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include "libfdt_env.h"
 
+#ifndef USE_HOSTCC
 #include <fdt.h>
 #include <libfdt.h>
+#else
+#include "fdt_host.h"
+#endif
 
 #include "libfdt_internal.h"
 
-#define CHECK_HEADER(fdt)	{ \
-	int err; \
-	if ((err = fdt_check_header(fdt)) != 0) \
-		return err; \
-}
-
-static int offset_streq(const void *fdt, int offset,
-			const char *s, int len)
+static int nodename_eq(const void *fdt, int offset,
+		       const char *s, int len)
 {
-	const char *p = fdt_offset_ptr(fdt, offset, len+1);
+	const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
 
 	if (! p)
 		/* short match */
@@ -41,94 +71,62 @@ static int offset_streq(const void *fdt, int offset,
 	if (memcmp(p, s, len) != 0)
 		return 0;
 
-	if (p[len] != '\0')
+	if (p[len] == '\0')
+		return 1;
+	else if (!memchr(s, '@', len) && (p[len] == '@'))
+		return 1;
+	else
 		return 0;
-
-	return 1;
 }
 
-/*
- * Return a pointer to the string at the given string offset.
- */
-char *fdt_string(const void *fdt, int stroffset)
+const char *fdt_string(const void *fdt, int stroffset)
 {
 	return (char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
 }
 
-/*
- * Return the node offset of the node specified by:
- *   parentoffset - starting place (0 to start at the root)
- *   name         - name being searched for
- *   namelen      - length of the name: typically strlen(name)
- *
- * Notes:
- *   If the start node has subnodes, the subnodes are _not_ searched for the
- *     requested name.
- */
-int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
-			       const char *name, int namelen)
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
 {
-	int level = 0;
-	uint32_t tag;
-	int offset, nextoffset;
-
 	CHECK_HEADER(fdt);
+	*address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
+	*size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
+	return 0;
+}
 
-	tag = fdt_next_tag(fdt, parentoffset, &nextoffset, NULL);
-	if (tag != FDT_BEGIN_NODE)
-		return -FDT_ERR_BADOFFSET;
-
-	do {
-		offset = nextoffset;
-		tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
-
-		switch (tag) {
-		case FDT_END:
-			return -FDT_ERR_TRUNCATED;
+int fdt_num_mem_rsv(const void *fdt)
+{
+	int i = 0;
 
-		case FDT_BEGIN_NODE:
-			level++;
-			/*
-			 * If we are nested down levels, ignore the strings
-			 * until we get back to the proper level.
-			 */
-			if (level != 1)
-				continue;
-
-			/* Return the offset if this is "our" string. */
-			if (offset_streq(fdt, offset+FDT_TAGSIZE, name, namelen))
-				return offset;
-			break;
+	while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
+		i++;
+	return i;
+}
 
-		case FDT_END_NODE:
-			level--;
-			break;
+int fdt_subnode_offset_namelen(const void *fdt, int offset,
+			       const char *name, int namelen)
+{
+	int depth;
 
-		case FDT_PROP:
-		case FDT_NOP:
-			break;
+	CHECK_HEADER(fdt);
 
-		default:
-			return -FDT_ERR_BADSTRUCTURE;
-		}
-	} while (level >= 0);
+	for (depth = 0;
+	     offset >= 0;
+	     offset = fdt_next_node(fdt, offset, &depth)) {
+		if (depth < 0)
+			return -FDT_ERR_NOTFOUND;
+		else if ((depth == 1)
+			 && nodename_eq(fdt, offset, name, namelen))
+			return offset;
+	}
 
-	return -FDT_ERR_NOTFOUND;
+	return offset; /* error */
 }
 
-/*
- * See fdt_subnode_offset_namelen()
- */
 int fdt_subnode_offset(const void *fdt, int parentoffset,
 		       const char *name)
 {
 	return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
 }
 
-/*
- * Searches for the node corresponding to the given path and returns the
- * offset of that node.
- */
 int fdt_path_offset(const void *fdt, const char *path)
 {
 	const char *end = path + strlen(path);
@@ -137,33 +135,21 @@ int fdt_path_offset(const void *fdt, const char *path)
 
 	CHECK_HEADER(fdt);
 
-	/* Paths must be absolute */
 	if (*path != '/')
 		return -FDT_ERR_BADPATH;
 
 	while (*p) {
 		const char *q;
 
-		/* Skip path separator(s) */
 		while (*p == '/')
 			p++;
 		if (! *p)
-			return -FDT_ERR_BADPATH;
-
-		/*
-		 * Find the next path separator.  The characters between
-		 * p and q are the next segment of the the path to find.
-		 */
+			return offset;
 		q = strchr(p, '/');
 		if (! q)
 			q = end;
 
-		/*
-		 * Find the offset corresponding to the this path segment.
-		 */
 		offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
-
-		/* Oops, error, abort abort abort */
 		if (offset < 0)
 			return offset;
 
@@ -173,17 +159,36 @@ int fdt_path_offset(const void *fdt, const char *path)
 	return offset;
 }
 
-/*
- * Given the offset of a node and a name of a property in that node, return
- * a pointer to the property struct.
- */
-struct fdt_property *fdt_get_property(const void *fdt,
-				      int nodeoffset,
-				      const char *name, int *lenp)
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+	const struct fdt_node_header *nh;
+	int err;
+
+	if ((err = fdt_check_header(fdt)) != 0)
+		goto fail;
+
+	err = -FDT_ERR_BADOFFSET;
+	nh = fdt_offset_ptr(fdt, nodeoffset, sizeof(*nh));
+	if (!nh || (fdt32_to_cpu(nh->tag) != FDT_BEGIN_NODE))
+		goto fail;
+
+	if (len)
+		*len = strlen(nh->name);
+
+	return nh->name;
+
+ fail:
+	if (len)
+		*len = err;
+	return NULL;
+}
+
+const struct fdt_property *fdt_get_property(const void *fdt,
+					    int nodeoffset,
+					    const char *name, int *lenp)
 {
-	int level = 0;
 	uint32_t tag;
-	struct fdt_property *prop;
+	const struct fdt_property *prop;
 	int namestroff;
 	int offset, nextoffset;
 	int err;
@@ -195,37 +200,27 @@ struct fdt_property *fdt_get_property(const void *fdt,
 	if (nodeoffset % FDT_TAGSIZE)
 		goto fail;
 
-	tag = fdt_next_tag(fdt, nodeoffset, &nextoffset, NULL);
+	tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
 	if (tag != FDT_BEGIN_NODE)
 		goto fail;
 
 	do {
 		offset = nextoffset;
 
-		tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
+		tag = fdt_next_tag(fdt, offset, &nextoffset);
 		switch (tag) {
 		case FDT_END:
 			err = -FDT_ERR_TRUNCATED;
 			goto fail;
 
 		case FDT_BEGIN_NODE:
-			level++;
-			break;
-
 		case FDT_END_NODE:
-			level--;
+		case FDT_NOP:
 			break;
 
 		case FDT_PROP:
-			/*
-			 * If we are nested down levels, ignore the strings
-			 * until we get back to the proper level.
-			 */
-			if (level != 0)
-				continue;
-
 			err = -FDT_ERR_BADSTRUCTURE;
-			prop = fdt_offset_ptr_typed(fdt, offset, prop);
+			prop = fdt_offset_ptr(fdt, offset, sizeof(*prop));
 			if (! prop)
 				goto fail;
 			namestroff = fdt32_to_cpu(prop->nameoff);
@@ -244,27 +239,20 @@ struct fdt_property *fdt_get_property(const void *fdt,
 			}
 			break;
 
-		case FDT_NOP:
-			break;
-
 		default:
 			err = -FDT_ERR_BADSTRUCTURE;
 			goto fail;
 		}
-	} while (level >= 0);
+	} while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
 
 	err = -FDT_ERR_NOTFOUND;
-fail:
+ fail:
 	if (lenp)
 		*lenp = err;
 	return NULL;
 }
 
-/*
- * Given the offset of a node and a name of a property in that node, return
- * a pointer to the property data (ONLY).
- */
-void *fdt_getprop(const void *fdt, int nodeoffset,
+const void *fdt_getprop(const void *fdt, int nodeoffset,
 		  const char *name, int *lenp)
 {
 	const struct fdt_property *prop;
@@ -273,130 +261,220 @@ void *fdt_getprop(const void *fdt, int nodeoffset,
 	if (! prop)
 		return NULL;
 
-	return (void *)prop->data;
+	return prop->data;
 }
 
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
+{
+	const uint32_t *php;
+	int len;
+
+	php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
+	if (!php || (len != sizeof(*php)))
+		return 0;
+
+	return fdt32_to_cpu(*php);
+}
 
-uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset, char **namep)
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
 {
-	const uint32_t *tagp, *lenp;
-	uint32_t tag;
-	const char *p;
-
-	if (offset % FDT_TAGSIZE)
-		return -1;
-
-	tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
-	if (! tagp)
-		return FDT_END; /* premature end */
-	tag = fdt32_to_cpu(*tagp);
-	offset += FDT_TAGSIZE;
-
-	switch (tag) {
-	case FDT_BEGIN_NODE:
-		if(namep)
-			*namep = fdt_offset_ptr(fdt, offset, 1);
-
-		/* skip name */
-		do {
-			p = fdt_offset_ptr(fdt, offset++, 1);
-		} while (p && (*p != '\0'));
-		if (! p)
-			return FDT_END;
-		break;
-	case FDT_PROP:
-		lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
-		if (! lenp)
-			return FDT_END;
-		/*
-		 * Get the property and set the namep to the name.
-		 */
-		if(namep) {
-			struct fdt_property *prop;
-
-			prop = fdt_offset_ptr_typed(fdt, offset - FDT_TAGSIZE, prop);
-			if (! prop)
-				return -FDT_ERR_BADSTRUCTURE;
-			*namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
+	int pdepth = 0, p = 0;
+	int offset, depth, namelen;
+	const char *name;
+
+	CHECK_HEADER(fdt);
+
+	if (buflen < 2)
+		return -FDT_ERR_NOSPACE;
+
+	for (offset = 0, depth = 0;
+	     (offset >= 0) && (offset <= nodeoffset);
+	     offset = fdt_next_node(fdt, offset, &depth)) {
+		if (pdepth < depth)
+			continue; /* overflowed buffer */
+
+		while (pdepth > depth) {
+			do {
+				p--;
+			} while (buf[p-1] != '/');
+			pdepth--;
+		}
+
+		name = fdt_get_name(fdt, offset, &namelen);
+		if (!name)
+			return namelen;
+		if ((p + namelen + 1) <= buflen) {
+			memcpy(buf + p, name, namelen);
+			p += namelen;
+			buf[p++] = '/';
+			pdepth++;
+		}
+
+		if (offset == nodeoffset) {
+			if (pdepth < (depth + 1))
+				return -FDT_ERR_NOSPACE;
+
+			if (p > 1) /* special case so that root path is "/", not "" */
+				p--;
+			buf[p] = '\0';
+			return p;
 		}
-		/* skip name offset, length and value */
-		offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp);
-		break;
 	}
 
-	if (nextoffset)
-		*nextoffset = ALIGN(offset, FDT_TAGSIZE);
+	if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+		return -FDT_ERR_BADOFFSET;
+	else if (offset == -FDT_ERR_BADOFFSET)
+		return -FDT_ERR_BADSTRUCTURE;
 
-	return tag;
+	return offset; /* error from fdt_next_node() */
 }
 
-/*
- * Return the number of used reserve map entries and total slots available.
- */
-int fdt_num_reservemap(void *fdt, int *used, int *total)
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+				 int supernodedepth, int *nodedepth)
 {
-	struct fdt_reserve_entry *re;
-	int  start;
-	int  end;
-	int  err = fdt_check_header(fdt);
-
-	if (err != 0)
-		return err;
-
-	start = fdt_off_mem_rsvmap(fdt);
-
-	/*
-	 * Convention is that the reserve map is before the dt_struct,
-	 * but it does not have to be.
-	 */
-	end = fdt_totalsize(fdt);
-	if (end > fdt_off_dt_struct(fdt))
-		end = fdt_off_dt_struct(fdt);
-	if (end > fdt_off_dt_strings(fdt))
-		end = fdt_off_dt_strings(fdt);
-
-	/*
-	 * Since the reserved area list is zero terminated, you get one fewer.
-	 */
-	if (total)
-		*total = ((end - start) / sizeof(struct fdt_reserve_entry)) - 1;
-
-	if (used) {
-		*used = 0;
-		while (start < end) {
-			re = (struct fdt_reserve_entry *)(fdt + start);
-			if (re->size == 0)
-				return 0;	/* zero size terminates the list */
-
-			*used += 1;
-			start += sizeof(struct fdt_reserve_entry);
+	int offset, depth;
+	int supernodeoffset = -FDT_ERR_INTERNAL;
+
+	CHECK_HEADER(fdt);
+
+	if (supernodedepth < 0)
+		return -FDT_ERR_NOTFOUND;
+
+	for (offset = 0, depth = 0;
+	     (offset >= 0) && (offset <= nodeoffset);
+	     offset = fdt_next_node(fdt, offset, &depth)) {
+		if (depth == supernodedepth)
+			supernodeoffset = offset;
+
+		if (offset == nodeoffset) {
+			if (nodedepth)
+				*nodedepth = depth;
+
+			if (supernodedepth > depth)
+				return -FDT_ERR_NOTFOUND;
+			else
+				return supernodeoffset;
 		}
-		/*
-		 * If we get here, there was no zero size termination.
-		 */
-		return -FDT_ERR_BADLAYOUT;
 	}
-	return 0;
+
+	if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+		return -FDT_ERR_BADOFFSET;
+	else if (offset == -FDT_ERR_BADOFFSET)
+		return -FDT_ERR_BADSTRUCTURE;
+
+	return offset; /* error from fdt_next_node() */
 }
 
-/*
- * Return the nth reserve map entry.
- */
-int fdt_get_reservemap(void *fdt, int n, struct fdt_reserve_entry *re)
+int fdt_node_depth(const void *fdt, int nodeoffset)
 {
-	int  used;
-	int  total;
-	int  err;
+	int nodedepth;
+	int err;
 
-	err = fdt_num_reservemap(fdt, &used, &total);
-	if (err != 0)
-		return err;
+	err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
+	if (err)
+		return (err < 0) ? err : -FDT_ERR_INTERNAL;
+	return nodedepth;
+}
 
-	if (n >= total)
-		return -FDT_ERR_NOSPACE;
-	if (re) {
-		*re = *(struct fdt_reserve_entry *)
-			_fdt_offset_ptr(fdt, n * sizeof(struct fdt_reserve_entry));
+int fdt_parent_offset(const void *fdt, int nodeoffset)
+{
+	int nodedepth = fdt_node_depth(fdt, nodeoffset);
+
+	if (nodedepth < 0)
+		return nodedepth;
+	return fdt_supernode_atdepth_offset(fdt, nodeoffset,
+					    nodedepth - 1, NULL);
+}
+
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+				  const char *propname,
+				  const void *propval, int proplen)
+{
+	int offset;
+	const void *val;
+	int len;
+
+	CHECK_HEADER(fdt);
+
+	/* FIXME: The algorithm here is pretty horrible: we scan each
+	 * property of a node in fdt_getprop(), then if that didn't
+	 * find what we want, we scan over them again making our way
+	 * to the next node.  Still it's the easiest to implement
+	 * approach; performance can come later. */
+	for (offset = fdt_next_node(fdt, startoffset, NULL);
+	     offset >= 0;
+	     offset = fdt_next_node(fdt, offset, NULL)) {
+		val = fdt_getprop(fdt, offset, propname, &len);
+		if (val && (len == proplen)
+		    && (memcmp(val, propval, len) == 0))
+			return offset;
+	}
+
+	return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
+{
+	if ((phandle == 0) || (phandle == -1))
+		return -FDT_ERR_BADPHANDLE;
+	phandle = cpu_to_fdt32(phandle);
+	return fdt_node_offset_by_prop_value(fdt, -1, "linux,phandle",
+					     &phandle, sizeof(phandle));
+}
+
+int _stringlist_contains(const void *strlist, int listlen, const char *str)
+{
+	int len = strlen(str);
+	const void *p;
+
+	while (listlen >= len) {
+		if (memcmp(str, strlist, len+1) == 0)
+			return 1;
+		p = memchr(strlist, '\0', listlen);
+		if (!p)
+			return 0; /* malformed strlist.. */
+		listlen -= (p-strlist) + 1;
+		strlist = p + 1;
 	}
 	return 0;
 }
+
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+			      const char *compatible)
+{
+	const void *prop;
+	int len;
+
+	prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
+	if (!prop)
+		return len;
+	if (_stringlist_contains(prop, len, compatible))
+		return 0;
+	else
+		return 1;
+}
+
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+				  const char *compatible)
+{
+	int offset, err;
+
+	CHECK_HEADER(fdt);
+
+	/* FIXME: The algorithm here is pretty horrible: we scan each
+	 * property of a node in fdt_node_check_compatible(), then if
+	 * that didn't find what we want, we scan over them again
+	 * making our way to the next node.  Still it's the easiest to
+	 * implement approach; performance can come later. */
+	for (offset = fdt_next_node(fdt, startoffset, NULL);
+	     offset >= 0;
+	     offset = fdt_next_node(fdt, offset, NULL)) {
+		err = fdt_node_check_compatible(fdt, offset, compatible);
+		if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
+			return err;
+		else if (err == 0)
+			return offset;
+	}
+
+	return offset; /* error from fdt_next_node() */
+}