diff options
Diffstat (limited to 'device_tree.c')
-rw-r--r-- | device_tree.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/device_tree.c b/device_tree.c new file mode 100644 index 0000000..cc91606 --- /dev/null +++ b/device_tree.c @@ -0,0 +1,109 @@ +/* + * Functions 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. + * + */ + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> + +#include "config.h" +#include "qemu-common.h" +#include "sysemu.h" +#include "device_tree.h" + +#include <libfdt.h> + +void *load_device_tree(const char *filename_path, int *sizep) +{ + int dt_size; + int dt_file_load_size; + int ret; + void *fdt = NULL; + + *sizep = 0; + dt_size = get_image_size(filename_path); + if (dt_size < 0) { + printf("Unable to get size of device tree file '%s'\n", + filename_path); + goto fail; + } + + /* Expand to 2x size to give enough room for manipulation. */ + dt_size *= 2; + /* First allocate space in qemu for device tree */ + fdt = qemu_mallocz(dt_size); + + dt_file_load_size = load_image(filename_path, fdt); + if (dt_file_load_size < 0) { + printf("Unable to open device tree file '%s'\n", + filename_path); + goto fail; + } + + ret = fdt_open_into(fdt, fdt, dt_size); + if (ret) { + printf("Unable to copy device tree in memory\n"); + goto fail; + } + + /* Check sanity of device tree */ + if (fdt_check_header(fdt)) { + printf ("Device tree file loaded into memory is invalid: %s\n", + filename_path); + goto fail; + } + *sizep = dt_size; + return fdt; + +fail: + qemu_free(fdt); + return NULL; +} + +int qemu_devtree_setprop(void *fdt, const char *node_path, + const char *property, uint32_t *val_array, int size) +{ + int offset; + + offset = fdt_path_offset(fdt, node_path); + if (offset < 0) + return offset; + + return fdt_setprop(fdt, offset, property, val_array, size); +} + +int qemu_devtree_setprop_cell(void *fdt, const char *node_path, + const char *property, uint32_t val) +{ + int offset; + + offset = fdt_path_offset(fdt, node_path); + if (offset < 0) + return offset; + + return fdt_setprop_cell(fdt, offset, property, val); +} + +int qemu_devtree_setprop_string(void *fdt, const char *node_path, + const char *property, const char *string) +{ + int offset; + + offset = fdt_path_offset(fdt, node_path); + if (offset < 0) + return offset; + + return fdt_setprop_string(fdt, offset, property, string); +} |