1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Taken from Linux v4.9 drivers/of/address.c 4 * 5 * Modified for U-Boot 6 * Copyright (c) 2017 Google, Inc 7 */ 8 9#ifndef _DM_OF_ADDR_H 10#define _DM_OF_ADDR_H 11 12/** 13 * of_translate_address() - translate a device-tree address to a CPU address 14 * 15 * Translate an address from the device-tree into a CPU physical address, 16 * this walks up the tree and applies the various bus mappings on the way. 17 * 18 * Note: We consider that crossing any level with #size-cells == 0 to mean 19 * that translation is impossible (that is we are not dealing with a value 20 * that can be mapped to a cpu physical address). This is not really specified 21 * that way, but this is traditionally the way IBM at least do things 22 * 23 * @np: pointer to node to check 24 * @in_addr: pointer to input address 25 * Return: translated address or OF_BAD_ADDR on error 26 */ 27u64 of_translate_address(const struct device_node *np, const __be32 *in_addr); 28 29/** 30 * of_translate_dma_address() - translate a device-tree DMA address to a CPU 31 * address 32 * 33 * Translate a DMA address from the device-tree into a CPU physical address, 34 * this walks up the tree and applies the various bus mappings on the way. 35 * 36 * Note: We consider that crossing any level with #size-cells == 0 to mean 37 * that translation is impossible (that is we are not dealing with a value 38 * that can be mapped to a cpu physical address). This is not really specified 39 * that way, but this is traditionally the way IBM at least do things 40 * 41 * @np: ne 42 * @in_addr: pointer to input DMA address 43 * Return: translated DMA address or OF_BAD_ADDR on error 44 */ 45u64 of_translate_dma_address(const struct device_node *np, const __be32 *in_addr); 46 47 48/** 49 * of_get_dma_range() - get dma-ranges for a specific DT node 50 * 51 * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and 52 * cpu->bus address translations 53 * 54 * @np: Pointer to device tree blob 55 * @cpu: Pointer to variable storing the range's cpu address 56 * @bus: Pointer to variable storing the range's bus address 57 * @size: Pointer to variable storing the range's size 58 * Return: translated DMA address or OF_BAD_ADDR on error 59 */ 60int of_get_dma_range(const struct device_node *np, phys_addr_t *cpu, 61 dma_addr_t *bus, u64 *size); 62 63/** 64 * of_get_address() - obtain an address from a node 65 * 66 * Extract an address from a node, returns the region size and the address 67 * space flags too. The PCI version uses a BAR number instead of an absolute 68 * index. 69 * 70 * @np: Node to check 71 * @index: Index of address to read (0 = first) 72 * @size: place to put size on success 73 * @flags: place to put flags on success 74 * Return: pointer to address which can be read 75 */ 76const __be32 *of_get_address(const struct device_node *np, int index, 77 u64 *size, unsigned int *flags); 78 79struct resource; 80 81/** 82 * of_address_to_resource() - translate device tree address to resource 83 * 84 * Note that if your address is a PIO address, the conversion will fail if 85 * the physical address can't be internally converted to an IO token with 86 * pci_address_to_pio(), that is because it's either called to early or it 87 * can't be matched to any host bridge IO space 88 * 89 * @np: node to check 90 * @index: index of address to read (0 = first) 91 * @r: place to put resource information 92 * Return: 0 if OK, -ve on error 93 */ 94int of_address_to_resource(const struct device_node *np, int index, 95 struct resource *r); 96 97#endif 98