| Simon Glass | 38d21b4 | 2017-05-18 20:08:59 -0600 | [diff] [blame^] | 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 |