/* * 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 "device_tree.h" #include "hw/loader.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 += 10000; dt_size *= 2; /* First allocate space in qemu for device tree */ fdt = g_malloc0(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: g_free(fdt); return NULL; } static int findnode_nofail(void *fdt, const char *node_path) { int offset; offset = fdt_path_offset(fdt, node_path); if (offset < 0) { fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path, fdt_strerror(offset)); exit(1); } return offset; } int qemu_devtree_setprop(void *fdt, const char *node_path, const char *property, void *val_array, int size) { int r; r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size); if (r < 0) { fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path, property, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_setprop_cell(void *fdt, const char *node_path, const char *property, uint32_t val) { int r; r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val); if (r < 0) { fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__, node_path, property, val, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_setprop_string(void *fdt, const char *node_path, const char *property, const char *string) { int r; r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string); if (r < 0) { fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__, node_path, property, string, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_nop_node(void *fdt, const char *node_path) { int r; r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path)); if (r < 0) { fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_add_subnode(void *fdt, const char *name) { char *dupname = g_strdup(name); char *basename = strrchr(dupname, '/'); int retval; if (!basename) { g_free(dupname); return -1; } basename[0] = '\0'; basename++; retval = fdt_add_subnode(fdt, findnode_nofail(fdt, dupname), basename); if (retval < 0) { fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name, fdt_strerror(retval)); exit(1); } g_free(dupname); return retval; }