1 /*
2 * Functions to help device tree manipulation using libfdt.
3 * It also provides functions to read entries from device tree proc
4 * interface.
5 *
6 * Copyright 2008 IBM Corporation.
7 * Authors: Jerone Young <jyoung5@us.ibm.com>
8 * Hollis Blanchard <hollisb@us.ibm.com>
9 *
10 * This work is licensed under the GNU GPL license version 2 or later.
11 *
12 */
13
14 #include <stdio.h>
15 #include <sys/types.h>
16 #include <sys/stat.h>
17 #include <fcntl.h>
18 #include <unistd.h>
19 #include <stdlib.h>
20
21 #include "config.h"
22 #include "qemu-common.h"
23 #include "device_tree.h"
24 #include "hw/loader.h"
25
26 #include <libfdt.h>
27
load_device_tree(const char * filename_path,int * sizep)28 void *load_device_tree(const char *filename_path, int *sizep)
29 {
30 int dt_size;
31 int dt_file_load_size;
32 int ret;
33 void *fdt = NULL;
34
35 *sizep = 0;
36 dt_size = get_image_size(filename_path);
37 if (dt_size < 0) {
38 printf("Unable to get size of device tree file '%s'\n",
39 filename_path);
40 goto fail;
41 }
42
43 /* Expand to 2x size to give enough room for manipulation. */
44 dt_size *= 2;
45 /* First allocate space in qemu for device tree */
46 fdt = qemu_mallocz(dt_size);
47
48 dt_file_load_size = load_image(filename_path, fdt);
49 if (dt_file_load_size < 0) {
50 printf("Unable to open device tree file '%s'\n",
51 filename_path);
52 goto fail;
53 }
54
55 ret = fdt_open_into(fdt, fdt, dt_size);
56 if (ret) {
57 printf("Unable to copy device tree in memory\n");
58 goto fail;
59 }
60
61 /* Check sanity of device tree */
62 if (fdt_check_header(fdt)) {
63 printf ("Device tree file loaded into memory is invalid: %s\n",
64 filename_path);
65 goto fail;
66 }
67 *sizep = dt_size;
68 return fdt;
69
70 fail:
71 qemu_free(fdt);
72 return NULL;
73 }
74
qemu_devtree_setprop(void * fdt,const char * node_path,const char * property,void * val_array,int size)75 int qemu_devtree_setprop(void *fdt, const char *node_path,
76 const char *property, void *val_array, int size)
77 {
78 int offset;
79
80 offset = fdt_path_offset(fdt, node_path);
81 if (offset < 0)
82 return offset;
83
84 return fdt_setprop(fdt, offset, property, val_array, size);
85 }
86
qemu_devtree_setprop_cell(void * fdt,const char * node_path,const char * property,uint32_t val)87 int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
88 const char *property, uint32_t val)
89 {
90 int offset;
91
92 offset = fdt_path_offset(fdt, node_path);
93 if (offset < 0)
94 return offset;
95
96 return fdt_setprop_cell(fdt, offset, property, val);
97 }
98
qemu_devtree_setprop_string(void * fdt,const char * node_path,const char * property,const char * string)99 int qemu_devtree_setprop_string(void *fdt, const char *node_path,
100 const char *property, const char *string)
101 {
102 int offset;
103
104 offset = fdt_path_offset(fdt, node_path);
105 if (offset < 0)
106 return offset;
107
108 return fdt_setprop_string(fdt, offset, property, string);
109 }
110