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: 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 *no, 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: node to check 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 *no, 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 * @param blob Pointer to device tree blob 55 * @param node_offset Node DT offset 56 * @param cpu Pointer to variable storing the range's cpu address 57 * @param bus Pointer to variable storing the range's bus address 58 * @param size Pointer to variable storing the range's size 59 * @return translated DMA address or OF_BAD_ADDR on error 60 */ 61 int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu, 62 dma_addr_t *bus, u64 *size); 63 64 /** 65 * of_get_address() - obtain an address from a node 66 * 67 * Extract an address from a node, returns the region size and the address 68 * space flags too. The PCI version uses a BAR number instead of an absolute 69 * index. 70 * 71 * @np: Node to check 72 * @index: Index of address to read (0 = first) 73 * @size: place to put size on success 74 * @flags: place to put flags on success 75 * @return pointer to address which can be read 76 */ 77 const __be32 *of_get_address(const struct device_node *no, int index, 78 u64 *size, unsigned int *flags); 79 80 struct resource; 81 82 /** 83 * of_address_to_resource() - translate device tree address to resource 84 * 85 * Note that if your address is a PIO address, the conversion will fail if 86 * the physical address can't be internally converted to an IO token with 87 * pci_address_to_pio(), that is because it's either called to early or it 88 * can't be matched to any host bridge IO space 89 * 90 * @np: node to check 91 * @index: index of address to read (0 = first) 92 * @r: place to put resource information 93 * @return 0 if OK, -ve on error 94 */ 95 int of_address_to_resource(const struct device_node *no, int index, 96 struct resource *r); 97 98 #endif 99