qemu/include/sysemu/device_tree.h

/*
 * 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);

int qemu_devtree_setprop(void *fdt, const char *node_path,
                         const char *property, const void *val_array, int size);
int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
                              const char *property, uint32_t val);
int qemu_devtree_setprop_u64(void *fdt, const char *node_path,
                             const char *property, uint64_t val);
int qemu_devtree_setprop_string(void *fdt, const char *node_path,
                                const char *property, const char *string);
int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
                                 const char *property,
                                 const char *target_node_path);
const void *qemu_devtree_getprop(void *fdt, const char *node_path,
                                 const char *property, int *lenp);
uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path,
                                   const char *property);
uint32_t qemu_devtree_get_phandle(void *fdt, const char *path);
uint32_t qemu_devtree_alloc_phandle(void *fdt);
int qemu_devtree_nop_node(void *fdt, const char *node_path);
int qemu_devtree_add_subnode(void *fdt, const char *name);

#define qemu_devtree_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_devtree_setprop(fdt, node_path, property, qdt_tmp,               \
                             sizeof(qdt_tmp));                                \
    } while (0)

void qemu_devtree_dumpdtb(void *fdt, int size);

/**
 * qemu_devtree_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_devtree_setprop_cells(). If you're not setting up the
 * array programmatically, qemu_devtree_setprop_sized_cells may be more
 * convenient.
 *
 * Return value: 0 on success, <0 on error.
 */
int qemu_devtree_setprop_sized_cells_from_array(void *fdt,
                                                const char *node_path,
                                                const char *property,
                                                int numvalues,
                                                uint64_t *values);

/**
 * qemu_devtree_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_devtree_setprop_sized_cells_from_array().
 *
 * Return value: 0 on success, <0 on error.
 */
#define qemu_devtree_setprop_sized_cells(fdt, node_path, property, ...)       \
    ({                                                                        \
        uint64_t qdt_tmp[] = { __VA_ARGS__ };                                 \
        qemu_devtree_setprop_sized_cells_from_array(fdt, node_path,           \
                                                    property,                 \
                                                    ARRAY_SIZE(qdt_tmp) / 2,  \
                                                    qdt_tmp);                 \
    })

#endif /* __DEVICE_TREE_H__ */