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 #ifdef CONFIG_LINUX 20 /** 21 * load_device_tree_from_sysfs: reads the device tree information in the 22 * /proc/device-tree directory and return the corresponding binary blob 23 * buffer pointer. Asserts in case of error. 24 */ 25 void *load_device_tree_from_sysfs(void); 26 #endif 27 28 /** 29 * qemu_fdt_node_path: return the paths of nodes matching a given 30 * name and compat string 31 * @fdt: pointer to the dt blob 32 * @name: node name 33 * @compat: compatibility string 34 * @errp: handle to an error object 35 * 36 * returns a newly allocated NULL-terminated array of node paths. 37 * Use g_strfreev() to free it. If one or more nodes were found, the 38 * array contains the path of each node and the last element equals to 39 * NULL. If there is no error but no matching node was found, the 40 * returned array contains a single element equal to NULL. If an error 41 * was encountered when parsing the blob, the function returns NULL 42 * 43 * @name may be NULL to wildcard names and only match compatibility 44 * strings. 45 */ 46 char **qemu_fdt_node_path(void *fdt, const char *name, const char *compat, 47 Error **errp); 48 49 /** 50 * qemu_fdt_node_unit_path: return the paths of nodes matching a given 51 * node-name, ie. node-name and node-name@unit-address 52 * @fdt: pointer to the dt blob 53 * @name: node name 54 * @errp: handle to an error object 55 * 56 * returns a newly allocated NULL-terminated array of node paths. 57 * Use g_strfreev() to free it. If one or more nodes were found, the 58 * array contains the path of each node and the last element equals to 59 * NULL. If there is no error but no matching node was found, the 60 * returned array contains a single element equal to NULL. If an error 61 * was encountered when parsing the blob, the function returns NULL 62 */ 63 char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp); 64 65 int qemu_fdt_setprop(void *fdt, const char *node_path, 66 const char *property, const void *val, int size); 67 int qemu_fdt_setprop_cell(void *fdt, const char *node_path, 68 const char *property, uint32_t val); 69 int qemu_fdt_setprop_u64(void *fdt, const char *node_path, 70 const char *property, uint64_t val); 71 int qemu_fdt_setprop_string(void *fdt, const char *node_path, 72 const char *property, const char *string); 73 74 /** 75 * qemu_fdt_setprop_string_array: set a string array property 76 * 77 * @fdt: pointer to the dt blob 78 * @name: node name 79 * @prop: property array 80 * @array: pointer to an array of string pointers 81 * @len: length of array 82 * 83 * assigns a string array to a property. This function converts and 84 * array of strings to a sequential string with \0 separators before 85 * setting the property. 86 */ 87 int qemu_fdt_setprop_string_array(void *fdt, const char *node_path, 88 const char *prop, char **array, int len); 89 90 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path, 91 const char *property, 92 const char *target_node_path); 93 /** 94 * qemu_fdt_getprop: retrieve the value of a given property 95 * @fdt: pointer to the device tree blob 96 * @node_path: node path 97 * @property: name of the property to find 98 * @lenp: fdt error if any or length of the property on success 99 * @errp: handle to an error object 100 * 101 * returns a pointer to the property on success and NULL on failure 102 */ 103 const void *qemu_fdt_getprop(void *fdt, const char *node_path, 104 const char *property, int *lenp, 105 Error **errp); 106 /** 107 * qemu_fdt_getprop_cell: retrieve the value of a given 4 byte property 108 * @fdt: pointer to the device tree blob 109 * @node_path: node path 110 * @property: name of the property to find 111 * @lenp: fdt error if any or -EINVAL if the property size is different from 112 * 4 bytes, or 4 (expected length of the property) upon success. 113 * @errp: handle to an error object 114 * 115 * returns the property value on success 116 */ 117 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, 118 const char *property, int *lenp, 119 Error **errp); 120 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path); 121 uint32_t qemu_fdt_alloc_phandle(void *fdt); 122 int qemu_fdt_nop_node(void *fdt, const char *node_path); 123 int qemu_fdt_add_subnode(void *fdt, const char *name); 124 int qemu_fdt_add_path(void *fdt, const char *path); 125 126 #define qemu_fdt_setprop_cells(fdt, node_path, property, ...) \ 127 do { \ 128 uint32_t qdt_tmp[] = { __VA_ARGS__ }; \ 129 for (unsigned i_ = 0; i_ < ARRAY_SIZE(qdt_tmp); i_++) { \ 130 qdt_tmp[i_] = cpu_to_be32(qdt_tmp[i_]); \ 131 } \ 132 qemu_fdt_setprop(fdt, node_path, property, qdt_tmp, \ 133 sizeof(qdt_tmp)); \ 134 } while (0) 135 136 /** 137 * qemu_fdt_setprop_sized_cells_from_array: 138 * @fdt: device tree blob 139 * @node_path: node to set property on 140 * @property: property to set 141 * @numvalues: number of values 142 * @values: array of number-of-cells, value pairs 143 * 144 * Set the specified property on the specified node in the device tree 145 * to be an array of cells. The values of the cells are specified via 146 * the values list, which alternates between "number of cells used by 147 * this value" and "value". 148 * number-of-cells must be either 1 or 2 (other values will result in 149 * an error being returned). If a value is too large to fit in the 150 * number of cells specified for it, an error is returned. 151 * 152 * This function is useful because device tree nodes often have cell arrays 153 * which are either lists of addresses or lists of address,size tuples, but 154 * the number of cells used for each element vary depending on the 155 * #address-cells and #size-cells properties of their parent node. 156 * If you know all your cell elements are one cell wide you can use the 157 * simpler qemu_fdt_setprop_cells(). If you're not setting up the 158 * array programmatically, qemu_fdt_setprop_sized_cells may be more 159 * convenient. 160 * 161 * Return value: 0 on success, <0 on error. 162 */ 163 int qemu_fdt_setprop_sized_cells_from_array(void *fdt, 164 const char *node_path, 165 const char *property, 166 int numvalues, 167 uint64_t *values); 168 169 /** 170 * qemu_fdt_setprop_sized_cells: 171 * @fdt: device tree blob 172 * @node_path: node to set property on 173 * @property: property to set 174 * @...: list of number-of-cells, value pairs 175 * 176 * Set the specified property on the specified node in the device tree 177 * to be an array of cells. The values of the cells are specified via 178 * the variable arguments, which alternates between "number of cells 179 * used by this value" and "value". 180 * 181 * This is a convenience wrapper for the function 182 * qemu_fdt_setprop_sized_cells_from_array(). 183 * 184 * Return value: 0 on success, <0 on error. 185 */ 186 #define qemu_fdt_setprop_sized_cells(fdt, node_path, property, ...) \ 187 ({ \ 188 uint64_t qdt_tmp[] = { __VA_ARGS__ }; \ 189 qemu_fdt_setprop_sized_cells_from_array(fdt, node_path, \ 190 property, \ 191 ARRAY_SIZE(qdt_tmp) / 2, \ 192 qdt_tmp); \ 193 }) 194 195 196 /** 197 * qemu_fdt_randomize_seeds: 198 * @fdt: device tree blob 199 * 200 * Re-randomize all "rng-seed" properties with new seeds. 201 */ 202 void qemu_fdt_randomize_seeds(void *fdt); 203 204 #define FDT_PCI_RANGE_RELOCATABLE 0x80000000 205 #define FDT_PCI_RANGE_PREFETCHABLE 0x40000000 206 #define FDT_PCI_RANGE_ALIASED 0x20000000 207 #define FDT_PCI_RANGE_TYPE_MASK 0x03000000 208 #define FDT_PCI_RANGE_MMIO_64BIT 0x03000000 209 #define FDT_PCI_RANGE_MMIO 0x02000000 210 #define FDT_PCI_RANGE_IOPORT 0x01000000 211 #define FDT_PCI_RANGE_CONFIG 0x00000000 212 213 #endif /* DEVICE_TREE_H */ 214