1 /* 2 * Header with function prototypes to help device tree manipulation using 3 * libfdt. It also provides functions to read entries from device tree proc 4 * interface. 5 * 6 * Copyright 2008 IBM Corporation. 7 * Authors: Jerone Young <jyoung5@us.ibm.com> 8 * Hollis Blanchard <hollisb@us.ibm.com> 9 * 10 * This work is licensed under the GNU GPL license version 2 or later. 11 * 12 */ 13 14 #ifndef __DEVICE_TREE_H__ 15 #define __DEVICE_TREE_H__ 16 17 void *create_device_tree(int *sizep); 18 void *load_device_tree(const char *filename_path, int *sizep); 19 20 int qemu_fdt_setprop(void *fdt, const char *node_path, 21 const char *property, const void *val, int size); 22 int qemu_fdt_setprop_cell(void *fdt, const char *node_path, 23 const char *property, uint32_t val); 24 int qemu_fdt_setprop_u64(void *fdt, const char *node_path, 25 const char *property, uint64_t val); 26 int qemu_fdt_setprop_string(void *fdt, const char *node_path, 27 const char *property, const char *string); 28 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path, 29 const char *property, 30 const char *target_node_path); 31 const void *qemu_fdt_getprop(void *fdt, const char *node_path, 32 const char *property, int *lenp); 33 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, 34 const char *property); 35 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path); 36 uint32_t qemu_fdt_alloc_phandle(void *fdt); 37 int qemu_fdt_nop_node(void *fdt, const char *node_path); 38 int qemu_fdt_add_subnode(void *fdt, const char *name); 39 40 #define qemu_fdt_setprop_cells(fdt, node_path, property, ...) \ 41 do { \ 42 uint32_t qdt_tmp[] = { __VA_ARGS__ }; \ 43 int i; \ 44 \ 45 for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) { \ 46 qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]); \ 47 } \ 48 qemu_fdt_setprop(fdt, node_path, property, qdt_tmp, \ 49 sizeof(qdt_tmp)); \ 50 } while (0) 51 52 void qemu_fdt_dumpdtb(void *fdt, int size); 53 54 /** 55 * qemu_fdt_setprop_sized_cells_from_array: 56 * @fdt: device tree blob 57 * @node_path: node to set property on 58 * @property: property to set 59 * @numvalues: number of values 60 * @values: array of number-of-cells, value pairs 61 * 62 * Set the specified property on the specified node in the device tree 63 * to be an array of cells. The values of the cells are specified via 64 * the values list, which alternates between "number of cells used by 65 * this value" and "value". 66 * number-of-cells must be either 1 or 2 (other values will result in 67 * an error being returned). If a value is too large to fit in the 68 * number of cells specified for it, an error is returned. 69 * 70 * This function is useful because device tree nodes often have cell arrays 71 * which are either lists of addresses or lists of address,size tuples, but 72 * the number of cells used for each element vary depending on the 73 * #address-cells and #size-cells properties of their parent node. 74 * If you know all your cell elements are one cell wide you can use the 75 * simpler qemu_fdt_setprop_cells(). If you're not setting up the 76 * array programmatically, qemu_fdt_setprop_sized_cells may be more 77 * convenient. 78 * 79 * Return value: 0 on success, <0 on error. 80 */ 81 int qemu_fdt_setprop_sized_cells_from_array(void *fdt, 82 const char *node_path, 83 const char *property, 84 int numvalues, 85 uint64_t *values); 86 87 /** 88 * qemu_fdt_setprop_sized_cells: 89 * @fdt: device tree blob 90 * @node_path: node to set property on 91 * @property: property to set 92 * @...: list of number-of-cells, value pairs 93 * 94 * Set the specified property on the specified node in the device tree 95 * to be an array of cells. The values of the cells are specified via 96 * the variable arguments, which alternates between "number of cells 97 * used by this value" and "value". 98 * 99 * This is a convenience wrapper for the function 100 * qemu_fdt_setprop_sized_cells_from_array(). 101 * 102 * Return value: 0 on success, <0 on error. 103 */ 104 #define qemu_fdt_setprop_sized_cells(fdt, node_path, property, ...) \ 105 ({ \ 106 uint64_t qdt_tmp[] = { __VA_ARGS__ }; \ 107 qemu_fdt_setprop_sized_cells_from_array(fdt, node_path, \ 108 property, \ 109 ARRAY_SIZE(qdt_tmp) / 2, \ 110 qdt_tmp); \ 111 }) 112 113 #endif /* __DEVICE_TREE_H__ */ 114