aboutsummaryrefslogtreecommitdiff
path: root/device_tree.c
blob: dc69232f10da4be242a97f13d1d0e6422dc12c6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * 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) {
        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;
}