drivers/of/address.c

255  * of_range_to_resource - Create a resource from a ranges entry
257  * @index:	the 'ranges' index to convert to a resource
414 	const __be32 *ranges;
420 	 * Normally, an absence of a "ranges" property means we are
425 	 * /ht nodes with no "ranges" property and a lot of perfectly
427 	 * "ranges" as equivalent to an empty "ranges" property which means
435 	 * This quirk also applies for 'dma-ranges' which frequently exist in
436 	 * child nodes without 'dma-ranges' in the parent nodes. --RobH
438 	ranges = of_get_property(parent, rprop, &rlen);
439 	if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
440 	    strcmp(rprop, "dma-ranges")) {
441 		pr_debug("no ranges; cannot translate\n");
444 	if (ranges == NULL || rlen == 0) {
447 		pr_debug("empty ranges; 1:1 translation\n");
451 	pr_debug("walking ranges...\n");
453 	/* Now walk through the ranges */
456 	for (; rlen >= rone; rlen -= rone, ranges += rone) {
457 		offset = bus->map(addr, ranges, na, ns, pna, bus->flag_cells);
465 	memcpy(addr, ranges + na, 4 * pna);
536 		 * For indirectIO device which has no ranges property, get
580 				     in_addr, "ranges", &host);
626 				     in_addr, "dma-ranges", &host);
751 	parser->dma = !strcmp(name, "dma-ranges");
766 	return parser_init(parser, node, "ranges");
773 	return parser_init(parser, node, "dma-ranges");
843 				       in_addr, "ranges", &host);
865  * Look in bottom up direction for the first "dma-ranges" property
868  * dma-ranges format:
873  * It returns -ENODEV if "dma-ranges" property was not found for this
879 	const __be32 *ranges = NULL;
887 		ranges = of_get_property(node, "dma-ranges", &len);
889 		/* Ignore empty ranges, they imply no translation required */
890 		if (ranges && len > 0)
893 		/* Once we find 'dma-ranges', then a missing one is an error */
894 		if (found_dma_ranges && !ranges)
902 	if (!node || !ranges) {
903 		pr_debug("no dma-ranges found for node(%pOF)\n", np);
924 	 * Record all info in the generic DMA ranges array for struct device,
925 	 * returning an error if we don't find any parsable ranges.
958 	const __be32 *ranges;
965 	ranges = of_get_property(np, "dma-ranges", &len);
966 	if (ranges && len) {