2  * libfdt - Flat Device Tree manipulation
22  *     MA 02110-1301 USA
60  * overlay_get_target_phandle - retrieves the target phandle of a fragment
66  * property) instead of a path (target-path property).
69  *      the phandle pointed by the target property
71  *	-1, if the phandle was malformed
73 static uint32_t overlay_get_target_phandle(const void *fdto, int fragment)  in overlay_get_target_phandle()
76 	int len;  in overlay_get_target_phandle()
82 	if ((len != sizeof(*val)) || (fdt32_to_cpu(*val) == (uint32_t)-1))  in overlay_get_target_phandle()
83 		return (uint32_t)-1;  in overlay_get_target_phandle()
89  * overlay_get_target - retrieves the offset of a fragment's target
103 static int overlay_get_target(const void *fdt, const void *fdto,  in overlay_get_target()
104 			      int fragment, char const **pathp)  in overlay_get_target()
108 	int path_len = 0, ret;  in overlay_get_target()
112 	if (phandle == (uint32_t)-1)  in overlay_get_target()
113 		return -FDT_ERR_BADPHANDLE;  in overlay_get_target()
118 		path = fdt_getprop(fdto, fragment, "target-path", &path_len);  in overlay_get_target()
128 	* target-path property in a node that contains a  in overlay_get_target()
133 	if (ret < 0 && path_len == -FDT_ERR_NOTFOUND)  in overlay_get_target()
134 		ret = -FDT_ERR_BADOVERLAY;  in overlay_get_target()
148  * overlay_phandle_add_offset - Increases a phandle by an offset
151  * @name: Name of the property to modify (phandle or linux,phandle)
161 static int overlay_phandle_add_offset(void *fdt, int node,  in overlay_phandle_add_offset()
166 	int len;  in overlay_phandle_add_offset()
173 		return -FDT_ERR_BADPHANDLE;  in overlay_phandle_add_offset()
177 		return -FDT_ERR_NOPHANDLES;  in overlay_phandle_add_offset()
180 	if (adj_val == (uint32_t)-1)  in overlay_phandle_add_offset()
181 		return -FDT_ERR_NOPHANDLES;  in overlay_phandle_add_offset()
187  * overlay_adjust_node_phandles - Offsets the phandles of a node
201 static int overlay_adjust_node_phandles(void *fdto, int node,  in overlay_adjust_node_phandles()
204 	int child;  in overlay_adjust_node_phandles()
205 	int ret;  in overlay_adjust_node_phandles()
208 	if (ret && ret != -FDT_ERR_NOTFOUND)  in overlay_adjust_node_phandles()
212 	if (ret && ret != -FDT_ERR_NOTFOUND)  in overlay_adjust_node_phandles()
225  * overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
238 static int overlay_adjust_local_phandles(void *fdto, uint32_t delta)  in overlay_adjust_local_phandles()
247  * overlay_update_local_node_references - Adjust the overlay references
265 static int overlay_update_local_node_references(void *fdto,  in overlay_update_local_node_references()
266 						int tree_node,  in overlay_update_local_node_references()
267 						int fixup_node,  in overlay_update_local_node_references()
270 	int fixup_prop;  in overlay_update_local_node_references()
271 	int fixup_child;  in overlay_update_local_node_references()
272 	int ret;  in overlay_update_local_node_references()
278 		int fixup_len;  in overlay_update_local_node_references()
279 		int tree_len;  in overlay_update_local_node_references()
280 		int i;  in overlay_update_local_node_references()
288 			return -FDT_ERR_BADOVERLAY;  in overlay_update_local_node_references()
292 			if (tree_len == -FDT_ERR_NOTFOUND)  in overlay_update_local_node_references()
293 				return -FDT_ERR_BADOVERLAY;  in overlay_update_local_node_references()
321 			if (ret == -FDT_ERR_NOSPACE)  in overlay_update_local_node_references()
322 				return -FDT_ERR_BADOVERLAY;  in overlay_update_local_node_references()
332 		int tree_child;  in overlay_update_local_node_references()
336 		if (tree_child == -FDT_ERR_NOTFOUND)  in overlay_update_local_node_references()
337 			return -FDT_ERR_BADOVERLAY;  in overlay_update_local_node_references()
353  * overlay_update_local_references - Adjust the overlay references
369 static int overlay_update_local_references(void *fdto, uint32_t delta)  in overlay_update_local_references()
371 	int fixups;  in overlay_update_local_references()
376 		if (fixups == -FDT_ERR_NOTFOUND)  in overlay_update_local_references()
390  * overlay_fixup_one_phandle - Set an overlay phandle to the base one
396  * @name: Name of the property holding the phandle reference in the overlay
398  * @poffset: Offset within the overlay property where the phandle is stored
412 static int overlay_fixup_one_phandle(void *fdt, void *fdto,  in overlay_fixup_one_phandle()
413 				     int symbols_off,  in overlay_fixup_one_phandle()
416 				     int poffset, const char *label)  in overlay_fixup_one_phandle()
421 	int symbol_off, fixup_off;  in overlay_fixup_one_phandle()
422 	int prop_len;  in overlay_fixup_one_phandle()
438 		return -FDT_ERR_NOTFOUND;  in overlay_fixup_one_phandle()
441 	if (fixup_off == -FDT_ERR_NOTFOUND)  in overlay_fixup_one_phandle()
442 		return -FDT_ERR_BADOVERLAY;  in overlay_fixup_one_phandle()
454  * overlay_fixup_phandle - Set an overlay phandle to the base one
458  * @property: Property offset in the overlay holding the list of fixups
461  * to in a __fixups__ property, and updates them to match the phandles
472 static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,  in overlay_fixup_phandle()
473 				 int property)  in overlay_fixup_phandle()  argument
477 	int len;  in overlay_fixup_phandle()
479 	value = fdt_getprop_by_offset(fdto, property,  in overlay_fixup_phandle()
482 		if (len == -FDT_ERR_NOTFOUND)  in overlay_fixup_phandle()
483 			return -FDT_ERR_INTERNAL;  in overlay_fixup_phandle()
494 		int poffset, ret;  in overlay_fixup_phandle()
498 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
499 		fixup_len = fixup_end - fixup_str;  in overlay_fixup_phandle()
501 		len -= fixup_len + 1;  in overlay_fixup_phandle()
507 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
509 		path_len = sep - path;  in overlay_fixup_phandle()
510 		if (path_len == (fixup_len - 1))  in overlay_fixup_phandle()
511 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
513 		fixup_len -= path_len + 1;  in overlay_fixup_phandle()
517 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
519 		name_len = sep - name;  in overlay_fixup_phandle()
521 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
525 			return -FDT_ERR_BADOVERLAY;  in overlay_fixup_phandle()
538  * overlay_fixup_phandles - Resolve the overlay phandles to the base
554 static int overlay_fixup_phandles(void *fdt, void *fdto)  in overlay_fixup_phandles()
556 	int fixups_off, symbols_off;  in overlay_fixup_phandles()
557 	int property;  in overlay_fixup_phandles()  local
561 	if (fixups_off == -FDT_ERR_NOTFOUND)  in overlay_fixup_phandles()
568 	if ((symbols_off < 0 && (symbols_off != -FDT_ERR_NOTFOUND)))  in overlay_fixup_phandles()
571 	fdt_for_each_property_offset(property, fdto, fixups_off) {  in overlay_fixup_phandles()
572 		int ret;  in overlay_fixup_phandles()
574 		ret = overlay_fixup_phandle(fdt, fdto, symbols_off, property);  in overlay_fixup_phandles()
583  * overlay_apply_node - Merges a node into the base device tree
601 static int overlay_apply_node(void *fdt, int target,  in overlay_apply_node()
602 			      void *fdto, int node)  in overlay_apply_node()
604 	int property;  in overlay_apply_node()  local
605 	int subnode;  in overlay_apply_node()
607 	fdt_for_each_property_offset(property, fdto, node) {  in overlay_apply_node()
610 		int prop_len;  in overlay_apply_node()
611 		int ret;  in overlay_apply_node()
613 		prop = fdt_getprop_by_offset(fdto, property, &name,  in overlay_apply_node()
615 		if (prop_len == -FDT_ERR_NOTFOUND)  in overlay_apply_node()
616 			return -FDT_ERR_INTERNAL;  in overlay_apply_node()
627 		int nnode;  in overlay_apply_node()
628 		int ret;  in overlay_apply_node()
631 		if (nnode == -FDT_ERR_EXISTS) {  in overlay_apply_node()
633 			if (nnode == -FDT_ERR_NOTFOUND)  in overlay_apply_node()
634 				return -FDT_ERR_INTERNAL;  in overlay_apply_node()
649  * overlay_merge - Merge an overlay into its base device tree
663 static int overlay_merge(void *fdt, void *fdto)  in overlay_merge()
665 	int fragment;  in overlay_merge()
668 		int overlay;  in overlay_merge()
669 		int target;  in overlay_merge()
670 		int ret;  in overlay_merge()
677 		if (overlay == -FDT_ERR_NOTFOUND)  in overlay_merge()
695 static int get_path_len(const void *fdt, int nodeoffset)  in get_path_len()
697 	int len = 0, namelen;  in get_path_len()
724  * overlay_symbol_update - Update the symbols of base tree after a merge
739 static int overlay_symbol_update(void *fdt, void *fdto)  in overlay_symbol_update()
741 	int root_sym, ov_sym, prop, path_len, fragment, target;  in overlay_symbol_update()
742 	int len, frag_name_len, ret, rel_path_len;  in overlay_symbol_update()
761 	if (root_sym == -FDT_ERR_NOTFOUND)  in overlay_symbol_update()
774 		/* verify it's a string property (terminated by a single \0) */  in overlay_symbol_update()
775 		if (path_len < 1 || memchr(path, '\0', path_len) != &path[path_len - 1])  in overlay_symbol_update()
776 			return -FDT_ERR_BADVALUE;  in overlay_symbol_update()
781 		/* format: /<fragment-name>/__overlay__/<relative-subnode-path> */  in overlay_symbol_update()
784 			return -FDT_ERR_BADVALUE;  in overlay_symbol_update()
789 			return -FDT_ERR_BADOVERLAY;  in overlay_symbol_update()
792 		frag_name_len = s - path - 1;  in overlay_symbol_update()
795 		len = sizeof("/__overlay__/") - 1;  in overlay_symbol_update()
796 		if ((e - s) < len || memcmp(s, "/__overlay__/", len))  in overlay_symbol_update()
797 			return -FDT_ERR_BADOVERLAY;  in overlay_symbol_update()
800 		rel_path_len = e - rel_path;  in overlay_symbol_update()
807 			return -FDT_ERR_BADOVERLAY;  in overlay_symbol_update()
813 			return -FDT_ERR_BADOVERLAY;  in overlay_symbol_update()
854 			len--;  in overlay_symbol_update()
864 int fdt_overlay_apply(void *fdt, void *fdto)  in fdt_overlay_apply()
867 	int ret;  in fdt_overlay_apply()