/* * Header with function prototypes to help device tree manipulation using * libfdt. It also provides functions to read entries from device tree proc * interface. * * Copyright 2008 IBM Corporation. * Authors: Jerone Young <jyoung5@us.ibm.com> * Hollis Blanchard <hollisb@us.ibm.com> * * This work is licensed under the GNU GPL license version 2 or later. * */ #ifndef DEVICE_TREE_H #define DEVICE_TREE_H void *create_device_tree(int *sizep); void *load_device_tree(const char *filename_path, int *sizep); #ifdef CONFIG_LINUX /** * load_device_tree_from_sysfs: reads the device tree information in the * /proc/device-tree directory and return the corresponding binary blob * buffer pointer. Asserts in case of error. */ void *load_device_tree_from_sysfs(void); #endif /** * qemu_fdt_node_path: return the paths of nodes matching a given * name and compat string * @fdt: pointer to the dt blob * @name: node name * @compat: compatibility string * @errp: handle to an error object * * returns a newly allocated NULL-terminated array of node paths. * Use g_strfreev() to free it. If one or more nodes were found, the * array contains the path of each node and the last element equals to * NULL. If there is no error but no matching node was found, the * returned array contains a single element equal to NULL. If an error * was encountered when parsing the blob, the function returns NULL */ char **qemu_fdt_node_path(void *fdt, const char *name, char *compat, Error **errp); /** * qemu_fdt_node_unit_path: return the paths of nodes matching a given * node-name, ie. node-name and node-name@unit-address * @fdt: pointer to the dt blob * @name: node name * @errp: handle to an error object * * returns a newly allocated NULL-terminated array of node paths. * Use g_strfreev() to free it. If one or more nodes were found, the * array contains the path of each node and the last element equals to * NULL. If there is no error but no matching node was found, the * returned array contains a single element equal to NULL. If an error * was encountered when parsing the blob, the function returns NULL */ char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp); int qemu_fdt_setprop(void *fdt, const char *node_path, const char *property, const void *val, int size); int qemu_fdt_setprop_cell(void *fdt, const char *node_path, const char *property, uint32_t val); int qemu_fdt_setprop_u64(void *fdt, const char *node_path, const char *property, uint64_t val); int qemu_fdt_setprop_string(void *fdt, const char *node_path, const char *property, const char *string); int qemu_fdt_setprop_phandle(void *fdt, const char *node_path, const char *property, const char *target_node_path); /** * qemu_fdt_getprop: retrieve the value of a given property * @fdt: pointer to the device tree blob * @node_path: node path * @property: name of the property to find * @lenp: fdt error if any or length of the property on success * @errp: handle to an error object * * returns a pointer to the property on success and NULL on failure */ const void *qemu_fdt_getprop(void *fdt, const char *node_path, const char *property, int *lenp, Error **errp); /** * qemu_fdt_getprop_cell: retrieve the value of a given 4 byte property * @fdt: pointer to the device tree blob * @node_path: node path * @property: name of the property to find * @lenp: fdt error if any or -EINVAL if the property size is different from * 4 bytes, or 4 (expected length of the property) upon success. * @errp: handle to an error object * * returns the property value on success */ uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, const char *property, int *lenp, Error **errp); uint32_t qemu_fdt_get_phandle(void *fdt, const char *path); uint32_t qemu_fdt_alloc_phandle(void *fdt); int qemu_fdt_nop_node(void *fdt, const char *node_path); int qemu_fdt_add_subnode(void *fdt, const char *name); #define qemu_fdt_setprop_cells(fdt, node_path, property, ...) \ do { \ uint32_t qdt_tmp[] = { __VA_ARGS__ }; \ int i; \ \ for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) { \ qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]); \ } \ qemu_fdt_setprop(fdt, node_path, property, qdt_tmp, \ sizeof(qdt_tmp)); \ } while (0) void qemu_fdt_dumpdtb(void *fdt, int size); /** * qemu_fdt_setprop_sized_cells_from_array: * @fdt: device tree blob * @node_path: node to set property on * @property: property to set * @numvalues: number of values * @values: array of number-of-cells, value pairs * * Set the specified property on the specified node in the device tree * to be an array of cells. The values of the cells are specified via * the values list, which alternates between "number of cells used by * this value" and "value". * number-of-cells must be either 1 or 2 (other values will result in * an error being returned). If a value is too large to fit in the * number of cells specified for it, an error is returned. * * This function is useful because device tree nodes often have cell arrays * which are either lists of addresses or lists of address,size tuples, but * the number of cells used for each element vary depending on the * #address-cells and #size-cells properties of their parent node. * If you know all your cell elements are one cell wide you can use the * simpler qemu_fdt_setprop_cells(). If you're not setting up the * array programmatically, qemu_fdt_setprop_sized_cells may be more * convenient. * * Return value: 0 on success, <0 on error. */ int qemu_fdt_setprop_sized_cells_from_array(void *fdt, const char *node_path, const char *property, int numvalues, uint64_t *values); /** * qemu_fdt_setprop_sized_cells: * @fdt: device tree blob * @node_path: node to set property on * @property: property to set * @...: list of number-of-cells, value pairs * * Set the specified property on the specified node in the device tree * to be an array of cells. The values of the cells are specified via * the variable arguments, which alternates between "number of cells * used by this value" and "value". * * This is a convenience wrapper for the function * qemu_fdt_setprop_sized_cells_from_array(). * * Return value: 0 on success, <0 on error. */ #define qemu_fdt_setprop_sized_cells(fdt, node_path, property, ...) \ ({ \ uint64_t qdt_tmp[] = { __VA_ARGS__ }; \ qemu_fdt_setprop_sized_cells_from_array(fdt, node_path, \ property, \ ARRAY_SIZE(qdt_tmp) / 2, \ qdt_tmp); \ }) #define FDT_PCI_RANGE_RELOCATABLE 0x80000000 #define FDT_PCI_RANGE_PREFETCHABLE 0x40000000 #define FDT_PCI_RANGE_ALIASED 0x20000000 #define FDT_PCI_RANGE_TYPE_MASK 0x03000000 #define FDT_PCI_RANGE_MMIO_64BIT 0x03000000 #define FDT_PCI_RANGE_MMIO 0x02000000 #define FDT_PCI_RANGE_IOPORT 0x01000000 #define FDT_PCI_RANGE_CONFIG 0x00000000 #endif /* DEVICE_TREE_H */