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38d21b41 SG |
1 | /* |
2 | * Taken from Linux v4.9 drivers/of/address.c | |
3 | * | |
4 | * Modified for U-Boot | |
5 | * Copyright (c) 2017 Google, Inc | |
6 | * | |
7 | * SPDX-License-Identifier: GPL-2.0+ | |
8 | */ | |
9 | ||
10 | #ifndef _DM_OF_ADDR_H | |
11 | #define _DM_OF_ADDR_H | |
12 | ||
13 | /** | |
14 | * of_translate_address() - translate a device-tree address to a CPU address | |
15 | * | |
16 | * Translate an address from the device-tree into a CPU physical address, | |
17 | * this walks up the tree and applies the various bus mappings on the way. | |
18 | * | |
19 | * Note: We consider that crossing any level with #size-cells == 0 to mean | |
20 | * that translation is impossible (that is we are not dealing with a value | |
21 | * that can be mapped to a cpu physical address). This is not really specified | |
22 | * that way, but this is traditionally the way IBM at least do things | |
23 | * | |
24 | * @np: node to check | |
25 | * @in_addr: pointer to input address | |
26 | * @return translated address or OF_BAD_ADDR on error | |
27 | */ | |
28 | u64 of_translate_address(const struct device_node *no, const __be32 *in_addr); | |
29 | ||
30 | /** | |
31 | * of_get_address() - obtain an address from a node | |
32 | * | |
33 | * Extract an address from a node, returns the region size and the address | |
34 | * space flags too. The PCI version uses a BAR number instead of an absolute | |
35 | * index. | |
36 | * | |
37 | * @np: Node to check | |
38 | * @index: Index of address to read (0 = first) | |
39 | * @size: place to put size on success | |
40 | * @flags: place to put flags on success | |
41 | * @return pointer to address which can be read | |
42 | */ | |
43 | const __be32 *of_get_address(const struct device_node *no, int index, | |
44 | u64 *size, unsigned int *flags); | |
45 | ||
46 | struct resource; | |
47 | ||
48 | /** | |
49 | * of_address_to_resource() - translate device tree address to resource | |
50 | * | |
51 | * Note that if your address is a PIO address, the conversion will fail if | |
52 | * the physical address can't be internally converted to an IO token with | |
53 | * pci_address_to_pio(), that is because it's either called to early or it | |
54 | * can't be matched to any host bridge IO space | |
55 | * | |
56 | * @np: node to check | |
57 | * @index: index of address to read (0 = first) | |
58 | * @r: place to put resource information | |
59 | * @return 0 if OK, -ve on error | |
60 | */ | |
61 | int of_address_to_resource(const struct device_node *no, int index, | |
62 | struct resource *r); | |
63 | ||
64 | #endif |