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 */ 27 u64 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 */ 45 u64 of_translate_dma_address(const struct device_node *np, const __be32 *in_addr); 46 47 /** 48 * of_get_dma_range() - get dma-ranges for a specific DT node 49 * 50 * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and 51 * cpu->bus address translations 52 * 53 * @np: Pointer to device tree blob 54 * @cpu: Pointer to variable storing the range's cpu address 55 * @bus: Pointer to variable storing the range's bus address 56 * @size: Pointer to variable storing the range's size 57 * Return: translated DMA address or OF_BAD_ADDR on error 58 */ 59 int of_get_dma_range(const struct device_node *np, phys_addr_t *cpu, 60 dma_addr_t *bus, u64 *size); 61 62 /** 63 * of_get_address() - obtain an address from a node 64 * 65 * Extract an address from a node, returns the region size and the address 66 * space flags too. The PCI version uses a BAR number instead of an absolute 67 * index. 68 * 69 * @np: Node to check 70 * @index: Index of address to read (0 = first) 71 * @size: place to put size on success 72 * @flags: place to put flags on success 73 * Return: pointer to address which can be read 74 */ 75 const __be32 *of_get_address(const struct device_node *np, int index, 76 u64 *size, unsigned int *flags); 77 78 struct resource; 79 80 /** 81 * of_address_to_resource() - translate device tree address to resource 82 * 83 * Note that if your address is a PIO address, the conversion will fail if 84 * the physical address can't be internally converted to an IO token with 85 * pci_address_to_pio(), that is because it's either called to early or it 86 * can't be matched to any host bridge IO space 87 * 88 * @np: node to check 89 * @index: index of address to read (0 = first) 90 * @r: place to put resource information 91 * Return: 0 if OK, -ve on error 92 */ 93 int of_address_to_resource(const struct device_node *np, int index, 94 struct resource *r); 95 96 #endif 97