root / device_tree.c @ 8e00128d
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1 | f652e6af | aurel32 | /*
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2 | f652e6af | aurel32 | * Functions to help device tree manipulation using libfdt.
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3 | f652e6af | aurel32 | * It also provides functions to read entries from device tree proc
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4 | f652e6af | aurel32 | * interface.
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5 | f652e6af | aurel32 | *
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6 | f652e6af | aurel32 | * Copyright 2008 IBM Corporation.
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7 | f652e6af | aurel32 | * Authors: Jerone Young <jyoung5@us.ibm.com>
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8 | f652e6af | aurel32 | * Hollis Blanchard <hollisb@us.ibm.com>
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9 | f652e6af | aurel32 | *
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10 | f652e6af | aurel32 | * This work is licensed under the GNU GPL license version 2 or later.
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11 | f652e6af | aurel32 | *
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12 | f652e6af | aurel32 | */
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13 | f652e6af | aurel32 | |
14 | f652e6af | aurel32 | #include <stdio.h> |
15 | f652e6af | aurel32 | #include <sys/types.h> |
16 | f652e6af | aurel32 | #include <sys/stat.h> |
17 | f652e6af | aurel32 | #include <fcntl.h> |
18 | f652e6af | aurel32 | #include <unistd.h> |
19 | f652e6af | aurel32 | #include <stdlib.h> |
20 | f652e6af | aurel32 | |
21 | f652e6af | aurel32 | #include "config.h" |
22 | f652e6af | aurel32 | #include "qemu-common.h" |
23 | f652e6af | aurel32 | #include "sysemu.h" |
24 | f652e6af | aurel32 | #include "device_tree.h" |
25 | 39b7f20e | Blue Swirl | #include "hw/loader.h" |
26 | f652e6af | aurel32 | |
27 | f652e6af | aurel32 | #include <libfdt.h> |
28 | f652e6af | aurel32 | |
29 | 7ec632b4 | pbrook | void *load_device_tree(const char *filename_path, int *sizep) |
30 | f652e6af | aurel32 | { |
31 | 7ec632b4 | pbrook | int dt_size;
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32 | f652e6af | aurel32 | int dt_file_load_size;
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33 | f652e6af | aurel32 | int ret;
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34 | 7ec632b4 | pbrook | void *fdt = NULL; |
35 | f652e6af | aurel32 | |
36 | 7ec632b4 | pbrook | *sizep = 0;
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37 | 7ec632b4 | pbrook | dt_size = get_image_size(filename_path); |
38 | 7ec632b4 | pbrook | if (dt_size < 0) { |
39 | f652e6af | aurel32 | printf("Unable to get size of device tree file '%s'\n",
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40 | f652e6af | aurel32 | filename_path); |
41 | f652e6af | aurel32 | goto fail;
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42 | f652e6af | aurel32 | } |
43 | f652e6af | aurel32 | |
44 | 7ec632b4 | pbrook | /* Expand to 2x size to give enough room for manipulation. */
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45 | 7ec632b4 | pbrook | dt_size *= 2;
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46 | f652e6af | aurel32 | /* First allocate space in qemu for device tree */
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47 | 7ec632b4 | pbrook | fdt = qemu_mallocz(dt_size); |
48 | f652e6af | aurel32 | |
49 | 7ec632b4 | pbrook | dt_file_load_size = load_image(filename_path, fdt); |
50 | 7ec632b4 | pbrook | if (dt_file_load_size < 0) { |
51 | 7ec632b4 | pbrook | printf("Unable to open device tree file '%s'\n",
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52 | 7ec632b4 | pbrook | filename_path); |
53 | 7ec632b4 | pbrook | goto fail;
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54 | 7ec632b4 | pbrook | } |
55 | f652e6af | aurel32 | |
56 | 7ec632b4 | pbrook | ret = fdt_open_into(fdt, fdt, dt_size); |
57 | f652e6af | aurel32 | if (ret) {
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58 | f652e6af | aurel32 | printf("Unable to copy device tree in memory\n");
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59 | f652e6af | aurel32 | goto fail;
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60 | f652e6af | aurel32 | } |
61 | f652e6af | aurel32 | |
62 | f652e6af | aurel32 | /* Check sanity of device tree */
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63 | f652e6af | aurel32 | if (fdt_check_header(fdt)) {
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64 | f652e6af | aurel32 | printf ("Device tree file loaded into memory is invalid: %s\n",
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65 | f652e6af | aurel32 | filename_path); |
66 | f652e6af | aurel32 | goto fail;
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67 | f652e6af | aurel32 | } |
68 | 7ec632b4 | pbrook | *sizep = dt_size; |
69 | f652e6af | aurel32 | return fdt;
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70 | f652e6af | aurel32 | |
71 | f652e6af | aurel32 | fail:
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72 | 7ec632b4 | pbrook | qemu_free(fdt); |
73 | f652e6af | aurel32 | return NULL; |
74 | f652e6af | aurel32 | } |
75 | f652e6af | aurel32 | |
76 | f652e6af | aurel32 | int qemu_devtree_setprop(void *fdt, const char *node_path, |
77 | f652e6af | aurel32 | const char *property, uint32_t *val_array, int size) |
78 | f652e6af | aurel32 | { |
79 | f652e6af | aurel32 | int offset;
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80 | f652e6af | aurel32 | |
81 | f652e6af | aurel32 | offset = fdt_path_offset(fdt, node_path); |
82 | f652e6af | aurel32 | if (offset < 0) |
83 | f652e6af | aurel32 | return offset;
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84 | f652e6af | aurel32 | |
85 | f652e6af | aurel32 | return fdt_setprop(fdt, offset, property, val_array, size);
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86 | f652e6af | aurel32 | } |
87 | f652e6af | aurel32 | |
88 | f652e6af | aurel32 | int qemu_devtree_setprop_cell(void *fdt, const char *node_path, |
89 | f652e6af | aurel32 | const char *property, uint32_t val) |
90 | f652e6af | aurel32 | { |
91 | f652e6af | aurel32 | int offset;
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92 | f652e6af | aurel32 | |
93 | f652e6af | aurel32 | offset = fdt_path_offset(fdt, node_path); |
94 | f652e6af | aurel32 | if (offset < 0) |
95 | f652e6af | aurel32 | return offset;
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96 | f652e6af | aurel32 | |
97 | f652e6af | aurel32 | return fdt_setprop_cell(fdt, offset, property, val);
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98 | f652e6af | aurel32 | } |
99 | f652e6af | aurel32 | |
100 | f652e6af | aurel32 | int qemu_devtree_setprop_string(void *fdt, const char *node_path, |
101 | f652e6af | aurel32 | const char *property, const char *string) |
102 | f652e6af | aurel32 | { |
103 | f652e6af | aurel32 | int offset;
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104 | f652e6af | aurel32 | |
105 | f652e6af | aurel32 | offset = fdt_path_offset(fdt, node_path); |
106 | f652e6af | aurel32 | if (offset < 0) |
107 | f652e6af | aurel32 | return offset;
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108 | f652e6af | aurel32 | |
109 | f652e6af | aurel32 | return fdt_setprop_string(fdt, offset, property, string);
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110 | f652e6af | aurel32 | } |