1 // SPDX-License-Identifier: GPL-2.0
43  * of_fdt_limit_memory - limit the number of regions in the /memory node
47  * memory entries in the /memory node. This function may be called
69 bool of_fdt_device_is_available(const void *blob, unsigned long node)  in of_fdt_device_is_available()  argument
71 	const char *status = fdt_getprop(blob, node, "status", NULL);  in of_fdt_device_is_available()
101 	struct property *pp, **pprev = NULL;  in populate_properties()
105 	pprev = &np->properties;  in populate_properties()
115 			pr_warn("Cannot locate property at 0x%x\n", cur);  in populate_properties()
120 			pr_warn("Cannot find property name at 0x%x\n", cur);  in populate_properties()
127 		pp = unflatten_dt_alloc(mem, sizeof(struct property),  in populate_properties()
128 					__alignof__(struct property));  in populate_properties()
133 		 * ePAPR-style "phandle" properties, or the  in populate_properties()
140 			if (!np->phandle)  in populate_properties()
141 				np->phandle = be32_to_cpup(val);  in populate_properties()
144 		/* And we process the "ibm,phandle" property  in populate_properties()
149 			np->phandle = be32_to_cpup(val);  in populate_properties()
151 		pp->name   = (char *)pname;  in populate_properties()
152 		pp->length = sz;  in populate_properties()
153 		pp->value  = (__be32 *)val;  in populate_properties()
155 		pprev      = &pp->next;  in populate_properties()
158 	/* With version 0x10 we may not have the name property,  in populate_properties()
175 		len = (pa - ps) + 1;  in populate_properties()
176 		pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,  in populate_properties()
177 					__alignof__(struct property));  in populate_properties()
179 			pp->name   = "name";  in populate_properties()
180 			pp->length = len;  in populate_properties()
181 			pp->value  = pp + 1;  in populate_properties()
183 			memcpy(pp->value, ps, len - 1);  in populate_properties()
184 			((char *)pp->value)[len - 1] = 0;  in populate_properties()
185 			pr_debug("fixed up name for %s -> %s\n",  in populate_properties()
186 				 nodename, (char *)pp->value);  in populate_properties()
215 		np->full_name = fn = ((char *)np) + sizeof(*np);  in populate_node()
220 			np->parent = dad;  in populate_node()
221 			np->sibling = dad->child;  in populate_node()
222 			dad->child = np;  in populate_node()
228 		np->name = of_get_property(np, "name", NULL);  in populate_node()
229 		if (!np->name)  in populate_node()
230 			np->name = "<NULL>";  in populate_node()
239 	struct device_node *child, *next;  in reverse_nodes()  local
241 	/* In-depth first */  in reverse_nodes()
242 	child = parent->child;  in reverse_nodes()
243 	while (child) {  in reverse_nodes()
244 		reverse_nodes(child);  in reverse_nodes()
246 		child = child->sibling;  in reverse_nodes()
249 	/* Reverse the nodes in the child list */  in reverse_nodes()
250 	child = parent->child;  in reverse_nodes()
251 	parent->child = NULL;  in reverse_nodes()
252 	while (child) {  in reverse_nodes()
253 		next = child->sibling;  in reverse_nodes()
255 		child->sibling = parent->child;  in reverse_nodes()
256 		parent->child = child;  in reverse_nodes()
257 		child = next;  in reverse_nodes()
262  * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree
287 	 * We're unflattening device sub-tree if @dad is valid. There are  in unflatten_dt_nodes()
302 		if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH - 1))  in unflatten_dt_nodes()
320 	if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {  in unflatten_dt_nodes()
322 		return -EINVAL;  in unflatten_dt_nodes()
326 	 * Reverse the child list. Some drivers assumes node order matches .dts  in unflatten_dt_nodes()
327 	 * node order  in unflatten_dt_nodes()
332 	return mem - base;  in unflatten_dt_nodes()
336  * __unflatten_device_tree - create tree of device_nodes from flat blob
338  * @dad: Parent device node
340  * @dt_alloc: An allocator that provides a virtual address to memory
344  * unflattens a device-tree, creating the tree of struct device_node. It also
345  * fills the "name" and "type" pointers of the nodes so the normal device-tree
364 	pr_debug(" -> unflatten_device_tree()\n");  in __unflatten_device_tree()
415 	pr_debug(" <- unflatten_device_tree()\n");  in __unflatten_device_tree()
427  * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
429  * @dad: Parent device node
432  * unflattens the device-tree passed by the firmware, creating the
434  * pointers of the nodes so the normal device-tree walking functions
467  * fdt_reserve_elfcorehdr() - reserves memory for elf core header
471  * information about primary kernel's core image and is used by a dump
491  * early_init_fdt_scan_reserved_mem() - create reserved memory regions
523  * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
536  * of_scan_flat_dt - scan flattened tree blob and call callback on each.
540  * This function is used to scan the flattened device-tree, it is
544 int __init of_scan_flat_dt(int (*it)(unsigned long node,  in of_scan_flat_dt()  argument
551 	int offset, rc = 0, depth = -1;  in of_scan_flat_dt()
556 	for (offset = fdt_next_node(blob, -1, &depth);  in of_scan_flat_dt()
567  * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
568  * @parent: parent node
572  * This function is used to scan sub-nodes of a node.
575 				    int (*it)(unsigned long node,  in of_scan_flat_dt_subnodes()  argument
581 	int node;  in of_scan_flat_dt_subnodes()  local
583 	fdt_for_each_subnode(node, blob, parent) {  in of_scan_flat_dt_subnodes()
587 		pathp = fdt_get_name(blob, node, NULL);  in of_scan_flat_dt_subnodes()
588 		rc = it(node, pathp, data);  in of_scan_flat_dt_subnodes()
596  * of_get_flat_dt_subnode_by_name - get the subnode by given name
598  * @node: the parent node
600  * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
603 int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)  in of_get_flat_dt_subnode_by_name()  argument
605 	return fdt_subnode_offset(initial_boot_params, node, uname);  in of_get_flat_dt_subnode_by_name()
609  * of_get_flat_dt_root - find the root node in the flat blob
617  * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
622 const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,  in of_get_flat_dt_prop()  argument
625 	return fdt_getprop(initial_boot_params, node, name, size);  in of_get_flat_dt_prop()
629  * of_fdt_is_compatible - Return true if given node from the given blob has
631  * @blob: A device tree blob
632  * @node: node to test
635  * Return: a non-zero value on match with smaller values returned for more
639 		      unsigned long node, const char *compat)  in of_fdt_is_compatible()  argument
645 	cp = fdt_getprop(blob, node, "compatible", &cplen);  in of_fdt_is_compatible()
654 		cplen -= l;  in of_fdt_is_compatible()
661  * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
662  * @node: node to test
665 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)  in of_flat_dt_is_compatible()  argument
667 	return of_fdt_is_compatible(initial_boot_params, node, compat);  in of_flat_dt_is_compatible()
671  * of_flat_dt_match - Return true if node matches a list of compatible values
673 static int __init of_flat_dt_match(unsigned long node, const char *const *compat)  in of_flat_dt_match()  argument
681 		tmp = of_fdt_is_compatible(initial_boot_params, node, *compat);  in of_flat_dt_match()
691  * of_get_flat_dt_phandle - Given a node in the flat blob, return the phandle
693 uint32_t __init of_get_flat_dt_phandle(unsigned long node)  in of_get_flat_dt_phandle()  argument
695 	return fdt_get_phandle(initial_boot_params, node);  in of_get_flat_dt_phandle()
710  * of_flat_dt_match_machine - Iterate match tables to find matching machine.
712  * @default_match: A machine specific ptr to return in case of no match.
745 				size -= strlen(prop) + 1;  in of_flat_dt_match_machine()
775  * early_init_dt_check_for_initrd - Decode initrd location from flat tree
776  * @node: reference to node containing initrd location ('chosen')
778 static void __init early_init_dt_check_for_initrd(unsigned long node)  in early_init_dt_check_for_initrd()  argument
789 	prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);  in early_init_dt_check_for_initrd()
794 	prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);  in early_init_dt_check_for_initrd()
803 	phys_initrd_size = end - start;  in early_init_dt_check_for_initrd()
809  * early_init_dt_check_for_elfcorehdr - Decode elfcorehdr location from flat
811  * @node: reference to node containing elfcorehdr location ('chosen')
813 static void __init early_init_dt_check_for_elfcorehdr(unsigned long node)  in early_init_dt_check_for_elfcorehdr()  argument
821 	pr_debug("Looking for elfcorehdr property... ");  in early_init_dt_check_for_elfcorehdr()
823 	prop = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);  in early_init_dt_check_for_elfcorehdr()
834 static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND;
837  * The main usage of linux,usable-memory-range is for crash dump kernel.
838  * Originally, the number of usable-memory regions is one. Now there may
840  * To make compatibility with existing user-space and older kdump, the low
841  * region is always the last range of linux,usable-memory-range if exist.
846  * early_init_dt_check_for_usable_mem_range - Decode usable memory range
854 	unsigned long node = chosen_node_offset;  in early_init_dt_check_for_usable_mem_range()  local
856 	if ((long)node < 0)  in early_init_dt_check_for_usable_mem_range()
859 	pr_debug("Looking for usable-memory-range property... ");  in early_init_dt_check_for_usable_mem_range()
861 	prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);  in early_init_dt_check_for_usable_mem_range()
880  * early_init_dt_check_kho - Decode info required for kexec handover from DT
884 	unsigned long node = chosen_node_offset;  in early_init_dt_check_kho()  local
889 	if (!IS_ENABLED(CONFIG_KEXEC_HANDOVER) || (long)node < 0)  in early_init_dt_check_kho()
892 	p = of_get_flat_dt_prop(node, "linux,kho-fdt", &l);  in early_init_dt_check_kho()
899 	p = of_get_flat_dt_prop(node, "linux,kho-scratch", &l);  in early_init_dt_check_kho()
924 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
926 	p = fdt_getprop(fdt, offset, "stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
928 		p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
930 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
935 	l = q - p;  in early_init_dt_scan_chosen_stdout()
937 	/* Get the node specified by stdout-path */  in early_init_dt_scan_chosen_stdout()
940 		pr_warn("earlycon: stdout-path %.*s not found\n", l, p);  in early_init_dt_scan_chosen_stdout()
945 		if (!match->compatible[0])  in early_init_dt_scan_chosen_stdout()
948 		if (fdt_node_check_compatible(fdt, offset, match->compatible))  in early_init_dt_scan_chosen_stdout()
952 		if (!ret || ret == -EALREADY)  in early_init_dt_scan_chosen_stdout()
955 	return -ENODEV;  in early_init_dt_scan_chosen_stdout()
960  * early_init_dt_scan_root - fetch the top level address and size cells
966 	int node = fdt_path_offset(fdt, "/");  in early_init_dt_scan_root()  local
968 	if (node < 0)  in early_init_dt_scan_root()
969 		return -ENODEV;  in early_init_dt_scan_root()
974 	prop = of_get_flat_dt_prop(node, "#size-cells", NULL);  in early_init_dt_scan_root()
975 	if (!WARN(!prop, "No '#size-cells' in root node\n"))  in early_init_dt_scan_root()
979 	prop = of_get_flat_dt_prop(node, "#address-cells", NULL);  in early_init_dt_scan_root()
980 	if (!WARN(!prop, "No '#address-cells' in root node\n"))  in early_init_dt_scan_root()
996  * early_init_dt_scan_memory - Look for and parse memory nodes
1000 	int node, found_memory = 0;  in early_init_dt_scan_memory()  local
1003 	fdt_for_each_subnode(node, fdt, 0) {  in early_init_dt_scan_memory()
1004 		const char *type = of_get_flat_dt_prop(node, "device_type", NULL);  in early_init_dt_scan_memory()
1013 		if (!of_fdt_device_is_available(fdt, node))  in early_init_dt_scan_memory()
1016 		reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);  in early_init_dt_scan_memory()
1018 			reg = of_get_flat_dt_prop(node, "reg", &l);  in early_init_dt_scan_memory()
1023 		hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);  in early_init_dt_scan_memory()
1025 		pr_debug("memory scan node %s, reg size %d,\n",  in early_init_dt_scan_memory()
1026 			 fdt_get_name(fdt, node, NULL), l);  in early_init_dt_scan_memory()
1028 		while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {  in early_init_dt_scan_memory()
1036 			pr_debug(" - %llx, %llx\n", base, size);  in early_init_dt_scan_memory()
1046 				pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",  in early_init_dt_scan_memory()
1055 	int l, node;  in early_init_dt_scan_chosen()  local
1060 	node = fdt_path_offset(fdt, "/chosen");  in early_init_dt_scan_chosen()
1061 	if (node < 0)  in early_init_dt_scan_chosen()
1062 		node = fdt_path_offset(fdt, "/chosen@0");  in early_init_dt_scan_chosen()
1063 	if (node < 0)  in early_init_dt_scan_chosen()
1064 		/* Handle the cmdline config options even if no /chosen node */  in early_init_dt_scan_chosen()
1067 	chosen_node_offset = node;  in early_init_dt_scan_chosen()
1069 	early_init_dt_check_for_initrd(node);  in early_init_dt_scan_chosen()
1070 	early_init_dt_check_for_elfcorehdr(node);  in early_init_dt_scan_chosen()
1072 	rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);  in early_init_dt_scan_chosen()
1077 		fdt_nop_property(initial_boot_params, node, "rng-seed");  in early_init_dt_scan_chosen()
1085 	p = of_get_flat_dt_prop(node, "bootargs", &l);  in early_init_dt_scan_chosen()
1091 	 * CONFIG_CMDLINE is meant to be a default in case nothing else  in early_init_dt_scan_chosen()
1124 	if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {  in early_init_dt_add_memory_arch()
1125 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1131 		size -= PAGE_SIZE - (base & ~PAGE_MASK);  in early_init_dt_add_memory_arch()
1137 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1142 	if (base + size - 1 > MAX_MEMBLOCK_ADDR) {  in early_init_dt_add_memory_arch()
1143 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1145 		size = MAX_MEMBLOCK_ADDR - base + 1;  in early_init_dt_add_memory_arch()
1149 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1154 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1156 		size -= phys_offset - base;  in early_init_dt_add_memory_arch()
1176 	/* Setup flat device-tree pointer */  in early_init_dt_verify()
1182 	/* Initialize {size,address}-cells info */  in early_init_dt_verify()
1193 	/* Retrieve various information from the /chosen node */  in early_init_dt_scan_nodes()
1196 		pr_warn("No chosen node found, continuing without\n");  in early_init_dt_scan_nodes()
1201 	/* Handle linux,usable-memory-range property */  in early_init_dt_scan_nodes()
1236  * unflatten_device_tree - create tree of device_nodes from flat blob
1238  * unflattens the device-tree passed by the firmware, creating the
1240  * pointers of the nodes so the normal device-tree walking functions
1247 	/* Save the statically-placed regions in the reserved_mem array */  in unflatten_device_tree()
1250 	/* Populate an empty root node when bootloader doesn't provide one */  in unflatten_device_tree()
1255 		    __dtb_empty_root_end - __dtb_empty_root_begin) {  in unflatten_device_tree()
1273  * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
1275  * Copies and unflattens the device-tree passed by the firmware, creating the
1277  * pointers of the nodes so the normal device-tree walking functions
1279  * reserved such is the case when the FDT is built-in to the kernel init