1 // SPDX-License-Identifier: GPL-2.0+
3 * Some very basic tests for fdtdec, accessed through test_fdtdec command.
4 * They are easiest to use with sandbox.
6 * Copyright (c) 2011 The Chromium OS Authors.
11 #include <linux/libfdt.h>
15 /* The size of our test fdt blob */
16 #define FDT_SIZE (16 * 1024)
18 #define CHECK(op) ({ \
21 printf("%s: %s: %s\n", __func__, #op, \
29 #define CHECKVAL(op, expected) ({ \
31 if (err != expected) { \
32 printf("%s: %s: expected %d, but returned %d\n",\
33 __func__, #op, expected, err); \
40 #define CHECKOK(op) CHECKVAL(op, 0)
42 /* maximum number of nodes / aliases to generate */
48 * @param fdt Device tree pointer
49 * @param size Size of device tree blob
50 * @param aliases Specifies alias assignments. Format is a list of items
51 * separated by space. Items are #a where
52 * # is the alias number
53 * a is the node to point to
54 * @param nodes Specifies nodes to generate (a=0, b=1), upper case
55 * means to create a disabled node
57 static int make_fdt(void *fdt, int size, const char *aliases,
60 char name[20], value[20];
62 #if defined(DEBUG) && defined(CONFIG_SANDBOX)
66 CHECK(fdt_create(fdt, size));
67 CHECK(fdt_finish_reservemap(fdt));
68 CHECK(fdt_begin_node(fdt, ""));
70 CHECK(fdt_begin_node(fdt, "aliases"));
71 for (s = aliases; *s;) {
72 sprintf(name, "i2c%c", *s);
73 sprintf(value, "/i2c%d@0", s[1] - 'a');
74 CHECK(fdt_property_string(fdt, name, value));
75 s += 2 + (s[2] != '\0');
77 CHECK(fdt_end_node(fdt));
79 for (s = nodes; *s; s++) {
80 sprintf(value, "i2c%d@0", (*s & 0xdf) - 'A');
81 CHECK(fdt_begin_node(fdt, value));
82 CHECK(fdt_property_string(fdt, "compatible",
83 fdtdec_get_compatible(COMPAT_UNKNOWN)));
85 CHECK(fdt_property_string(fdt, "status", "disabled"));
86 CHECK(fdt_end_node(fdt));
89 CHECK(fdt_end_node(fdt));
90 CHECK(fdt_finish(fdt));
92 #if defined(DEBUG) && defined(CONFIG_SANDBOX)
93 fd = os_open("/tmp/fdtdec-text.dtb", OS_O_CREAT | OS_O_WRONLY);
95 printf("Could not open .dtb file to write\n");
98 os_write(fd, fdt, size);
104 static int run_test(const char *aliases, const char *nodes, const char *expect)
111 blob = malloc(FDT_SIZE);
113 printf("%s: out of memory\n", __func__);
117 printf("aliases=%s, nodes=%s, expect=%s: ", aliases, nodes, expect);
118 CHECKVAL(make_fdt(blob, FDT_SIZE, aliases, nodes), 0);
119 CHECKVAL(fdtdec_find_aliases_for_id(blob, "i2c",
121 list, ARRAY_SIZE(list)), (int)strlen(expect));
123 /* Check we got the right ones */
124 for (i = 0, s = expect; *s; s++, i++) {
129 name = list[i] ? fdt_get_name(blob, list[i], NULL) : NULL;
131 got = name[3] + 'a' - '0';
134 printf("Position %d: Expected '%c', got '%c' ('%s')\n",
144 static int do_test_fdtdec(cmd_tbl_t *cmdtp, int flag, int argc,
148 CHECKOK(run_test("", "", ""));
149 CHECKOK(run_test("1e 3d", "", ""));
152 * 'a' represents 0, 'b' represents 1, etc.
153 * The first character is the alias number, the second is the node
154 * number. So the params mean:
155 * 0a 1b : point alias 0 to node 0 (a), alias 1 to node 1(b)
156 * ab : to create nodes 0 and 1 (a and b)
157 * ab : we expect the function to return two nodes, in
160 CHECKOK(run_test("0a 1b", "ab", "ab"));
162 CHECKOK(run_test("0a 1c", "ab", "ab"));
163 CHECKOK(run_test("1c", "ab", "ab"));
164 CHECKOK(run_test("1b", "ab", "ab"));
165 CHECKOK(run_test("0b", "ab", "ba"));
166 CHECKOK(run_test("0b 2d", "dbc", "bcd"));
167 CHECKOK(run_test("0d 3a 1c 2b", "dbac", "dcba"));
169 /* things with holes */
170 CHECKOK(run_test("1b 3d", "dbc", "cb d"));
171 CHECKOK(run_test("1e 3d", "dbc", "bc d"));
174 CHECKOK(run_test("", "dbac", "dbac"));
177 CHECKOK(run_test("0d 3a 1c 2b", "dBac", "dc a"));
178 CHECKOK(run_test("0b 2d", "DBc", "c"));
179 CHECKOK(run_test("0b 4d 2c", "DBc", " c"));
181 /* conflicting aliases - first one gets it */
182 CHECKOK(run_test("2a 1a 0a", "a", " a"));
183 CHECKOK(run_test("0a 1a 2a", "a", "a"));
185 printf("Test passed\n");
190 test_fdtdec, 3, 1, do_test_fdtdec,
192 "Run tests for fdtdec library");