1 // SPDX-License-Identifier: GPL-2.0
36  * of_fdt_limit_memory - limit the number of regions in the /memory node
40  * memory entries in the /memory node. This function may be called
60 				"#address-cells", NULL);  in of_fdt_limit_memory()
65 				"#size-cells", NULL);  in of_fdt_limit_memory()
83 static bool of_fdt_device_is_available(const void *blob, unsigned long node)  in of_fdt_device_is_available()  argument
85 	const char *status = fdt_getprop(blob, node, "status", NULL);  in of_fdt_device_is_available()
119 	pprev = &np->properties;  in populate_properties()
147 		 * ePAPR-style "phandle" properties, or the  in populate_properties()
154 			if (!np->phandle)  in populate_properties()
155 				np->phandle = be32_to_cpup(val);  in populate_properties()
163 			np->phandle = be32_to_cpup(val);  in populate_properties()
165 		pp->name   = (char *)pname;  in populate_properties()
166 		pp->length = sz;  in populate_properties()
167 		pp->value  = (__be32 *)val;  in populate_properties()
169 		pprev      = &pp->next;  in populate_properties()
189 		len = (pa - ps) + 1;  in populate_properties()
193 			pp->name   = "name";  in populate_properties()
194 			pp->length = len;  in populate_properties()
195 			pp->value  = pp + 1;  in populate_properties()
197 			memcpy(pp->value, ps, len - 1);  in populate_properties()
198 			((char *)pp->value)[len - 1] = 0;  in populate_properties()
199 			pr_debug("fixed up name for %s -> %s\n",  in populate_properties()
200 				 nodename, (char *)pp->value);  in populate_properties()
229 		np->full_name = fn = ((char *)np) + sizeof(*np);  in populate_node()
234 			np->parent = dad;  in populate_node()
235 			np->sibling = dad->child;  in populate_node()
236 			dad->child = np;  in populate_node()
242 		np->name = of_get_property(np, "name", NULL);  in populate_node()
243 		if (!np->name)  in populate_node()
244 			np->name = "<NULL>";  in populate_node()
253 	struct device_node *child, *next;  in reverse_nodes()  local
255 	/* In-depth first */  in reverse_nodes()
256 	child = parent->child;  in reverse_nodes()
257 	while (child) {  in reverse_nodes()
258 		reverse_nodes(child);  in reverse_nodes()
260 		child = child->sibling;  in reverse_nodes()
263 	/* Reverse the nodes in the child list */  in reverse_nodes()
264 	child = parent->child;  in reverse_nodes()
265 	parent->child = NULL;  in reverse_nodes()
266 	while (child) {  in reverse_nodes()
267 		next = child->sibling;  in reverse_nodes()
269 		child->sibling = parent->child;  in reverse_nodes()
270 		parent->child = child;  in reverse_nodes()
271 		child = next;  in reverse_nodes()
276  * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree
301 	 * We're unflattening device sub-tree if @dad is valid. There are  in unflatten_dt_nodes()
316 		if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH - 1))  in unflatten_dt_nodes()
334 	if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {  in unflatten_dt_nodes()
336 		return -EINVAL;  in unflatten_dt_nodes()
340 	 * Reverse the child list. Some drivers assumes node order matches .dts  in unflatten_dt_nodes()
341 	 * node order  in unflatten_dt_nodes()
346 	return mem - base;  in unflatten_dt_nodes()
350  * __unflatten_device_tree - create tree of device_nodes from flat blob
352  * @dad: Parent device node
358  * unflattens a device-tree, creating the tree of struct device_node. It also
359  * fills the "name" and "type" pointers of the nodes so the normal device-tree
378 	pr_debug(" -> unflatten_device_tree()\n");  in __unflatten_device_tree()
429 	pr_debug(" <- unflatten_device_tree()\n");  in __unflatten_device_tree()
441  * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
443  * @dad: Parent device node
446  * unflattens the device-tree passed by the firmware, creating the
448  * pointers of the nodes so the normal device-tree walking functions
490 			return -EBUSY;  in early_init_dt_reserve_memory()
498  * __reserved_mem_reserve_reg() - reserve all memory described in 'reg' property
500 static int __init __reserved_mem_reserve_reg(unsigned long node,  in __reserved_mem_reserve_reg()  argument
510 	prop = of_get_flat_dt_prop(node, "reg", &len);  in __reserved_mem_reserve_reg()
512 		return -ENOENT;  in __reserved_mem_reserve_reg()
515 		pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",  in __reserved_mem_reserve_reg()
517 		return -EINVAL;  in __reserved_mem_reserve_reg()
520 	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;  in __reserved_mem_reserve_reg()
528 			pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",  in __reserved_mem_reserve_reg()
531 			pr_err("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",  in __reserved_mem_reserve_reg()
534 		len -= t_len;  in __reserved_mem_reserve_reg()
536 			fdt_reserved_mem_save_node(node, uname, base, size);  in __reserved_mem_reserve_reg()
544  * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
545  * in /reserved-memory matches the values supported by the current implementation,
548 static int __init __reserved_mem_check_root(unsigned long node)  in __reserved_mem_check_root()  argument
552 	prop = of_get_flat_dt_prop(node, "#size-cells", NULL);  in __reserved_mem_check_root()
554 		return -EINVAL;  in __reserved_mem_check_root()
556 	prop = of_get_flat_dt_prop(node, "#address-cells", NULL);  in __reserved_mem_check_root()
558 		return -EINVAL;  in __reserved_mem_check_root()
560 	prop = of_get_flat_dt_prop(node, "ranges", NULL);  in __reserved_mem_check_root()
562 		return -EINVAL;  in __reserved_mem_check_root()
567  * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
571 	int node, child;  in fdt_scan_reserved_mem()  local
574 	node = fdt_path_offset(fdt, "/reserved-memory");  in fdt_scan_reserved_mem()
575 	if (node < 0)  in fdt_scan_reserved_mem()
576 		return -ENODEV;  in fdt_scan_reserved_mem()
578 	if (__reserved_mem_check_root(node) != 0) {  in fdt_scan_reserved_mem()
579 		pr_err("Reserved memory: unsupported node format, ignoring\n");  in fdt_scan_reserved_mem()
580 		return -EINVAL;  in fdt_scan_reserved_mem()
583 	fdt_for_each_subnode(child, fdt, node) {  in fdt_scan_reserved_mem()
587 		if (!of_fdt_device_is_available(fdt, child))  in fdt_scan_reserved_mem()
590 		uname = fdt_get_name(fdt, child, NULL);  in fdt_scan_reserved_mem()
592 		err = __reserved_mem_reserve_reg(child, uname);  in fdt_scan_reserved_mem()
593 		if (err == -ENOENT && of_get_flat_dt_prop(child, "size", NULL))  in fdt_scan_reserved_mem()
594 			fdt_reserved_mem_save_node(child, uname, 0, 0);  in fdt_scan_reserved_mem()
600  * fdt_reserve_elfcorehdr() - reserves memory for elf core header
624  * early_init_fdt_scan_reserved_mem() - create reserved memory regions
653  * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
666  * of_scan_flat_dt - scan flattened tree blob and call callback on each.
670  * This function is used to scan the flattened device-tree, it is
674 int __init of_scan_flat_dt(int (*it)(unsigned long node,  in of_scan_flat_dt()  argument
681 	int offset, rc = 0, depth = -1;  in of_scan_flat_dt()
686 	for (offset = fdt_next_node(blob, -1, &depth);  in of_scan_flat_dt()
697  * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
698  * @parent: parent node
702  * This function is used to scan sub-nodes of a node.
705 				    int (*it)(unsigned long node,  in of_scan_flat_dt_subnodes()  argument
711 	int node;  in of_scan_flat_dt_subnodes()  local
713 	fdt_for_each_subnode(node, blob, parent) {  in of_scan_flat_dt_subnodes()
717 		pathp = fdt_get_name(blob, node, NULL);  in of_scan_flat_dt_subnodes()
718 		rc = it(node, pathp, data);  in of_scan_flat_dt_subnodes()
726  * of_get_flat_dt_subnode_by_name - get the subnode by given name
728  * @node: the parent node
730  * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
733 int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)  in of_get_flat_dt_subnode_by_name()  argument
735 	return fdt_subnode_offset(initial_boot_params, node, uname);  in of_get_flat_dt_subnode_by_name()
739  * of_get_flat_dt_root - find the root node in the flat blob
747  * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
752 const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,  in of_get_flat_dt_prop()  argument
755 	return fdt_getprop(initial_boot_params, node, name, size);  in of_get_flat_dt_prop()
759  * of_fdt_is_compatible - Return true if given node from the given blob has
762  * @node: node to test
765  * Return: a non-zero value on match with smaller values returned for more
769 		      unsigned long node, const char *compat)  in of_fdt_is_compatible()  argument
775 	cp = fdt_getprop(blob, node, "compatible", &cplen);  in of_fdt_is_compatible()
784 		cplen -= l;  in of_fdt_is_compatible()
791  * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
792  * @node: node to test
795 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)  in of_flat_dt_is_compatible()  argument
797 	return of_fdt_is_compatible(initial_boot_params, node, compat);  in of_flat_dt_is_compatible()
801  * of_flat_dt_match - Return true if node matches a list of compatible values
803 static int __init of_flat_dt_match(unsigned long node, const char *const *compat)  in of_flat_dt_match()  argument
811 		tmp = of_fdt_is_compatible(initial_boot_params, node, *compat);  in of_flat_dt_match()
821  * of_get_flat_dt_phandle - Given a node in the flat blob, return the phandle
823 uint32_t __init of_get_flat_dt_phandle(unsigned long node)  in of_get_flat_dt_phandle()  argument
825 	return fdt_get_phandle(initial_boot_params, node);  in of_get_flat_dt_phandle()
840  * of_flat_dt_match_machine - Iterate match tables to find matching machine.
875 				size -= strlen(prop) + 1;  in of_flat_dt_match_machine()
905  * early_init_dt_check_for_initrd - Decode initrd location from flat tree
906  * @node: reference to node containing initrd location ('chosen')
908 static void __init early_init_dt_check_for_initrd(unsigned long node)  in early_init_dt_check_for_initrd()  argument
919 	prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);  in early_init_dt_check_for_initrd()
924 	prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);  in early_init_dt_check_for_initrd()
933 	phys_initrd_size = end - start;  in early_init_dt_check_for_initrd()
939  * early_init_dt_check_for_elfcorehdr - Decode elfcorehdr location from flat
941  * @node: reference to node containing elfcorehdr location ('chosen')
943 static void __init early_init_dt_check_for_elfcorehdr(unsigned long node)  in early_init_dt_check_for_elfcorehdr()  argument
953 	prop = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);  in early_init_dt_check_for_elfcorehdr()
964 static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND;
967  * The main usage of linux,usable-memory-range is for crash dump kernel.
968  * Originally, the number of usable-memory regions is one. Now there may
970  * To make compatibility with existing user-space and older kdump, the low
971  * region is always the last range of linux,usable-memory-range if exist.
976  * early_init_dt_check_for_usable_mem_range - Decode usable memory range
984 	unsigned long node = chosen_node_offset;  in early_init_dt_check_for_usable_mem_range()  local
986 	if ((long)node < 0)  in early_init_dt_check_for_usable_mem_range()
989 	pr_debug("Looking for usable-memory-range property... ");  in early_init_dt_check_for_usable_mem_range()
991 	prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);  in early_init_dt_check_for_usable_mem_range()
1024 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
1026 	p = fdt_getprop(fdt, offset, "stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
1028 		p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
1030 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
1035 	l = q - p;  in early_init_dt_scan_chosen_stdout()
1037 	/* Get the node specified by stdout-path */  in early_init_dt_scan_chosen_stdout()
1040 		pr_warn("earlycon: stdout-path %.*s not found\n", l, p);  in early_init_dt_scan_chosen_stdout()
1045 		if (!match->compatible[0])  in early_init_dt_scan_chosen_stdout()
1048 		if (fdt_node_check_compatible(fdt, offset, match->compatible))  in early_init_dt_scan_chosen_stdout()
1052 		if (!ret || ret == -EALREADY)  in early_init_dt_scan_chosen_stdout()
1055 	return -ENODEV;  in early_init_dt_scan_chosen_stdout()
1060  * early_init_dt_scan_root - fetch the top level address and size cells
1066 	int node = fdt_path_offset(fdt, "/");  in early_init_dt_scan_root()  local
1068 	if (node < 0)  in early_init_dt_scan_root()
1069 		return -ENODEV;  in early_init_dt_scan_root()
1074 	prop = of_get_flat_dt_prop(node, "#size-cells", NULL);  in early_init_dt_scan_root()
1079 	prop = of_get_flat_dt_prop(node, "#address-cells", NULL);  in early_init_dt_scan_root()
1096  * early_init_dt_scan_memory - Look for and parse memory nodes
1100 	int node, found_memory = 0;  in early_init_dt_scan_memory()  local
1103 	fdt_for_each_subnode(node, fdt, 0) {  in early_init_dt_scan_memory()
1104 		const char *type = of_get_flat_dt_prop(node, "device_type", NULL);  in early_init_dt_scan_memory()
1113 		if (!of_fdt_device_is_available(fdt, node))  in early_init_dt_scan_memory()
1116 		reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);  in early_init_dt_scan_memory()
1118 			reg = of_get_flat_dt_prop(node, "reg", &l);  in early_init_dt_scan_memory()
1123 		hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);  in early_init_dt_scan_memory()
1125 		pr_debug("memory scan node %s, reg size %d,\n",  in early_init_dt_scan_memory()
1126 			 fdt_get_name(fdt, node, NULL), l);  in early_init_dt_scan_memory()
1128 		while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {  in early_init_dt_scan_memory()
1136 			pr_debug(" - %llx, %llx\n", base, size);  in early_init_dt_scan_memory()
1146 				pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",  in early_init_dt_scan_memory()
1155 	int l, node;  in early_init_dt_scan_chosen()  local
1160 	node = fdt_path_offset(fdt, "/chosen");  in early_init_dt_scan_chosen()
1161 	if (node < 0)  in early_init_dt_scan_chosen()
1162 		node = fdt_path_offset(fdt, "/chosen@0");  in early_init_dt_scan_chosen()
1163 	if (node < 0)  in early_init_dt_scan_chosen()
1164 		/* Handle the cmdline config options even if no /chosen node */  in early_init_dt_scan_chosen()
1167 	chosen_node_offset = node;  in early_init_dt_scan_chosen()
1169 	early_init_dt_check_for_initrd(node);  in early_init_dt_scan_chosen()
1170 	early_init_dt_check_for_elfcorehdr(node);  in early_init_dt_scan_chosen()
1172 	rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);  in early_init_dt_scan_chosen()
1177 		fdt_nop_property(initial_boot_params, node, "rng-seed");  in early_init_dt_scan_chosen()
1185 	p = of_get_flat_dt_prop(node, "bootargs", &l);  in early_init_dt_scan_chosen()
1224 	if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {  in early_init_dt_add_memory_arch()
1225 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1231 		size -= PAGE_SIZE - (base & ~PAGE_MASK);  in early_init_dt_add_memory_arch()
1237 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1242 	if (base + size - 1 > MAX_MEMBLOCK_ADDR) {  in early_init_dt_add_memory_arch()
1243 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1245 		size = MAX_MEMBLOCK_ADDR - base + 1;  in early_init_dt_add_memory_arch()
1249 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1254 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1256 		size -= phys_offset - base;  in early_init_dt_add_memory_arch()
1282 	/* Setup flat device-tree pointer */  in early_init_dt_verify()
1294 	/* Initialize {size,address}-cells info */  in early_init_dt_scan_nodes()
1297 	/* Retrieve various information from the /chosen node */  in early_init_dt_scan_nodes()
1300 		pr_warn("No chosen node found, continuing without\n");  in early_init_dt_scan_nodes()
1305 	/* Handle linux,usable-memory-range property */  in early_init_dt_scan_nodes()
1322  * unflatten_device_tree - create tree of device_nodes from flat blob
1324  * unflattens the device-tree passed by the firmware, creating the
1326  * pointers of the nodes so the normal device-tree walking functions
1341  * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
1343  * Copies and unflattens the device-tree passed by the firmware, creating the
1345  * pointers of the nodes so the normal device-tree walking functions
1347  * reserved such is the case when the FDT is built-in to the kernel init