| /* |
| * 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; |
| } |
| |
| uint32_t qemu_devtree_get_phandle(void *fdt, const char *path) |
| { |
| uint32_t r; |
| |
| r = fdt_get_phandle(fdt, findnode_nofail(fdt, path)); |
| if (r <= 0) { |
| fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__, |
| path, fdt_strerror(r)); |
| exit(1); |
| } |
| |
| return r; |
| } |
| |
| int qemu_devtree_setprop_phandle(void *fdt, const char *node_path, |
| const char *property, |
| const char *target_node_path) |
| { |
| uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path); |
| return qemu_devtree_setprop_cell(fdt, node_path, property, phandle); |
| } |
| |
| 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; |
| int parent = 0; |
| |
| if (!basename) { |
| g_free(dupname); |
| return -1; |
| } |
| |
| basename[0] = '\0'; |
| basename++; |
| |
| if (dupname[0]) { |
| parent = findnode_nofail(fdt, dupname); |
| } |
| |
| retval = fdt_add_subnode(fdt, parent, basename); |
| #if 0 |
| if (retval < 0) { |
| fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name, |
| fdt_strerror(retval)); |
| exit(1); |
| } |
| #endif |
| |
| g_free(dupname); |
| return retval; |
| } |