fdt.c (3b1a2c97210b1edd1a999ff8c1f72ab28f7609f7) fdt.c (24bbd929e6b9e62afd263c42b4318d3b603c956c)
1/*
2 * Functions for working with the Flattened Device Tree data format
3 *
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License

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163/**
164 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
165 * @blob: The parent device tree blob
166 * @mem: Memory chunk to use for allocating device nodes and properties
167 * @p: pointer to node in flat tree
168 * @dad: Parent struct device_node
169 * @fpsize: Size of the node path up at the current depth.
170 */
1/*
2 * Functions for working with the Flattened Device Tree data format
3 *
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License

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163/**
164 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
165 * @blob: The parent device tree blob
166 * @mem: Memory chunk to use for allocating device nodes and properties
167 * @p: pointer to node in flat tree
168 * @dad: Parent struct device_node
169 * @fpsize: Size of the node path up at the current depth.
170 */
171static void * unflatten_dt_node(const void *blob,
171static void * unflatten_dt_node(void *blob,
172 void *mem,
173 int *poffset,
174 struct device_node *dad,
175 struct device_node **nodepp,
176 unsigned long fpsize,
177 bool dryrun)
178{
179 const __be32 *p;

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373 * tree of struct device_node. It also fills the "name" and "type"
374 * pointers of the nodes so the normal device-tree walking functions
375 * can be used.
376 * @blob: The blob to expand
377 * @mynodes: The device_node tree created by the call
378 * @dt_alloc: An allocator that provides a virtual address to memory
379 * for the resulting tree
380 */
172 void *mem,
173 int *poffset,
174 struct device_node *dad,
175 struct device_node **nodepp,
176 unsigned long fpsize,
177 bool dryrun)
178{
179 const __be32 *p;

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373 * tree of struct device_node. It also fills the "name" and "type"
374 * pointers of the nodes so the normal device-tree walking functions
375 * can be used.
376 * @blob: The blob to expand
377 * @mynodes: The device_node tree created by the call
378 * @dt_alloc: An allocator that provides a virtual address to memory
379 * for the resulting tree
380 */
381static void __unflatten_device_tree(const void *blob,
381static void __unflatten_device_tree(void *blob,
382 struct device_node **mynodes,
383 void * (*dt_alloc)(u64 size, u64 align))
384{
385 unsigned long size;
386 int start;
387 void *mem;
388
389 pr_debug(" -> unflatten_device_tree()\n");

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436/**
437 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
438 *
439 * unflattens the device-tree passed by the firmware, creating the
440 * tree of struct device_node. It also fills the "name" and "type"
441 * pointers of the nodes so the normal device-tree walking functions
442 * can be used.
443 */
382 struct device_node **mynodes,
383 void * (*dt_alloc)(u64 size, u64 align))
384{
385 unsigned long size;
386 int start;
387 void *mem;
388
389 pr_debug(" -> unflatten_device_tree()\n");

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436/**
437 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
438 *
439 * unflattens the device-tree passed by the firmware, creating the
440 * tree of struct device_node. It also fills the "name" and "type"
441 * pointers of the nodes so the normal device-tree walking functions
442 * can be used.
443 */
444void of_fdt_unflatten_tree(const unsigned long *blob,
444void of_fdt_unflatten_tree(unsigned long *blob,
445 struct device_node **mynodes)
446{
447 __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
448}
449EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
450
451/* Everything below here references initial_boot_params directly. */
452int __initdata dt_root_addr_cells;

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575void __init early_init_fdt_scan_reserved_mem(void)
576{
577 int n;
578 u64 base, size;
579
580 if (!initial_boot_params)
581 return;
582
445 struct device_node **mynodes)
446{
447 __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
448}
449EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
450
451/* Everything below here references initial_boot_params directly. */
452int __initdata dt_root_addr_cells;

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575void __init early_init_fdt_scan_reserved_mem(void)
576{
577 int n;
578 u64 base, size;
579
580 if (!initial_boot_params)
581 return;
582
583 /* Reserve the dtb region */
584 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
585 fdt_totalsize(initial_boot_params),
586 0);
587
588 /* Process header /memreserve/ fields */
589 for (n = 0; ; n++) {
590 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
591 if (!size)
592 break;
593 early_init_dt_reserve_memory_arch(base, size, 0);
594 }
595
596 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
597 fdt_init_reserved_mem();
598}
599
600/**
583 /* Process header /memreserve/ fields */
584 for (n = 0; ; n++) {
585 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
586 if (!size)
587 break;
588 early_init_dt_reserve_memory_arch(base, size, 0);
589 }
590
591 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
592 fdt_init_reserved_mem();
593}
594
595/**
596 * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
597 */
598void __init early_init_fdt_reserve_self(void)
599{
600 if (!initial_boot_params)
601 return;
602
603 /* Reserve the dtb region */
604 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
605 fdt_totalsize(initial_boot_params),
606 0);
607}
608
609/**
601 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
602 * @it: callback function
603 * @data: context data pointer
604 *
605 * This function is used to scan the flattened device-tree, it is
606 * used to extract the memory information at boot before we can
607 * unflatten the tree
608 */

--- 537 unchanged lines hidden --- 		610 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
611 * @it: callback function
612 * @data: context data pointer
613 *
614 * This function is used to scan the flattened device-tree, it is
615 * used to extract the memory information at boot before we can
616 * unflatten the tree
617 */

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