lib/fdtdec_test.c

   1 /*
   2  * Some very basic tests for fdtdec, accessed through test_fdtdec command.
   3  * They are easiest to use with sandbox.
   4  *
   5  * Copyright (c) 2011 The Chromium OS Authors.
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <fdtdec.h>
  27 #include <libfdt.h>
  28 #include <malloc.h>
  29 #include <os.h>
  30
  31 /* The size of our test fdt blob */
  32 #define FDT_SIZE        (16 * 1024)
  33
  34 /**
  35  * Check if an operation failed, and if so, print an error
  36  *
  37  * @param oper_name     Name of operation
  38  * @param err           Error code to check
  39  *
  40  * @return 0 if ok, -1 if there was an error
  41  */
  42 static int fdt_checkerr(const char *oper_name, int err)
  43 {
  44         if (err) {
  45                 printf("%s: %s: %s\n", __func__, oper_name, fdt_strerror(err));
  46                 return -1;
  47         }
  48
  49         return 0;
  50 }
  51
  52 /**
  53  * Check the result of an operation and if incorrect, print an error
  54  *
  55  * @param oper_name     Name of operation
  56  * @param expected      Expected value
  57  * @param value         Actual value
  58  *
  59  * @return 0 if ok, -1 if there was an error
  60  */
  61 static int checkval(const char *oper_name, int expected, int value)
  62 {
  63         if (expected != value) {
  64                 printf("%s: %s: expected %d, but returned %d\n", __func__,
  65                        oper_name, expected, value);
  66                 return -1;
  67         }
  68
  69         return 0;
  70 }
  71
  72 #define CHECK(op)       if (fdt_checkerr(#op, op)) return -1
  73 #define CHECKVAL(op, expected)  \
  74         if (checkval(#op, expected, op)) \
  75                 return -1
  76 #define CHECKOK(op)     CHECKVAL(op, 0)
  77
  78 /* maximum number of nodes / aliases to generate */
  79 #define MAX_NODES       20
  80
  81 /*
  82  * Make a test fdt
  83  *
  84  * @param fdt           Device tree pointer
  85  * @param size          Size of device tree blob
  86  * @param aliases       Specifies alias assignments. Format is a list of items
  87  *                      separated by space. Items are #a where
  88  *                              # is the alias number
  89  *                              a is the node to point to
  90  * @param nodes         Specifies nodes to generate (a=0, b=1), upper case
  91  *                      means to create a disabled node
  92  */
  93 static int make_fdt(void *fdt, int size, const char *aliases,
  94                     const char *nodes)
  95 {
  96         char name[20], value[20];
  97         const char *s;
  98         int fd;
  99
 100         CHECK(fdt_create(fdt, size));
 101         CHECK(fdt_finish_reservemap(fdt));
 102         CHECK(fdt_begin_node(fdt, ""));
 103
 104         CHECK(fdt_begin_node(fdt, "aliases"));
 105         for (s = aliases; *s;) {
 106                 sprintf(name, "i2c%c", *s);
 107                 sprintf(value, "/i2c%d@0", s[1] - 'a');
 108                 CHECK(fdt_property_string(fdt, name, value));
 109                 s += 2 + (s[2] != '\0');
 110         }
 111         CHECK(fdt_end_node(fdt));
 112
 113         for (s = nodes; *s; s++) {
 114                 sprintf(value, "i2c%d@0", (*s & 0xdf) - 'A');
 115                 CHECK(fdt_begin_node(fdt, value));
 116                 CHECK(fdt_property_string(fdt, "compatible",
 117                         fdtdec_get_compatible(COMPAT_UNKNOWN)));
 118                 if (*s <= 'Z')
 119                         CHECK(fdt_property_string(fdt, "status", "disabled"));
 120                 CHECK(fdt_end_node(fdt));
 121         }
 122
 123         CHECK(fdt_end_node(fdt));
 124         CHECK(fdt_finish(fdt));
 125         CHECK(fdt_pack(fdt));
 126 #if defined(DEBUG) && defined(CONFIG_SANDBOX)
 127         fd = os_open("/tmp/fdtdec-text.dtb", OS_O_CREAT | OS_O_WRONLY);
 128         if (fd == -1) {
 129                 printf("Could not open .dtb file to write\n");
 130                 return -1;
 131         }
 132         os_write(fd, fdt, size);
 133         os_close(fd);
 134 #endif
 135         return 0;
 136 }
 137
 138 static int run_test(const char *aliases, const char *nodes, const char *expect)
 139 {
 140         int list[MAX_NODES];
 141         const char *s;
 142         void *blob;
 143         int i;
 144
 145         blob = malloc(FDT_SIZE);
 146         if (!blob) {
 147                 printf("%s: out of memory\n", __func__);
 148                 return 1;
 149         }
 150
 151         printf("aliases=%s, nodes=%s, expect=%s: ", aliases, nodes, expect);
 152         CHECKVAL(make_fdt(blob, FDT_SIZE, aliases, nodes), 0);
 153         CHECKVAL(fdtdec_find_aliases_for_id(blob, "i2c",
 154                         COMPAT_UNKNOWN,
 155                         list, ARRAY_SIZE(list)), strlen(expect));
 156
 157         /* Check we got the right ones */
 158         for (i = 0, s = expect; *s; s++, i++) {
 159                 int want = *s;
 160                 const char *name;
 161                 int got = ' ';
 162
 163                 name = list[i] ? fdt_get_name(blob, list[i], NULL) : NULL;
 164                 if (name)
 165                         got = name[3] + 'a' - '0';
 166
 167                 if (got != want) {
 168                         printf("Position %d: Expected '%c', got '%c' ('%s')\n",
 169                                i, want, got, name);
 170                         return 1;
 171                 }
 172         }
 173
 174         printf("pass\n");
 175         return 0;
 176 }
 177
 178 static int do_test_fdtdec(cmd_tbl_t *cmdtp, int flag, int argc,
 179                           char * const argv[])
 180 {
 181         /* basic tests */
 182         CHECKOK(run_test("", "", ""));
 183         CHECKOK(run_test("1e 3d", "", ""));
 184
 185         /*
 186          * 'a' represents 0, 'b' represents 1, etc.
 187          * The first character is the alias number, the second is the node
 188          * number. So the params mean:
 189          * 0a 1b        : point alias 0 to node 0 (a), alias 1 to node 1(b)
 190          * ab           : to create nodes 0 and 1 (a and b)
 191          * ab           : we expect the function to return two nodes, in
 192          *                the order 0, 1
 193          */
 194         CHECKOK(run_test("0a 1b", "ab", "ab"));
 195
 196         CHECKOK(run_test("0a 1c", "ab", "ab"));
 197         CHECKOK(run_test("1c", "ab", "ab"));
 198         CHECKOK(run_test("1b", "ab", "ab"));
 199         CHECKOK(run_test("0b", "ab", "ba"));
 200         CHECKOK(run_test("0b 2d", "dbc", "bcd"));
 201         CHECKOK(run_test("0d 3a 1c 2b", "dbac", "dcba"));
 202
 203         /* things with holes */
 204         CHECKOK(run_test("1b 3d", "dbc", "cb d"));
 205         CHECKOK(run_test("1e 3d", "dbc", "bc d"));
 206
 207         /* no aliases */
 208         CHECKOK(run_test("", "dbac", "dbac"));
 209
 210         /* disabled nodes */
 211         CHECKOK(run_test("0d 3a 1c 2b", "dBac", "dc a"));
 212         CHECKOK(run_test("0b 2d", "DBc", "c"));
 213         CHECKOK(run_test("0b 4d 2c", "DBc", "  c"));
 214
 215         /* conflicting aliases - first one gets it */
 216         CHECKOK(run_test("2a 1a 0a", "a", "  a"));
 217         CHECKOK(run_test("0a 1a 2a", "a", "a"));
 218
 219         printf("Test passed\n");
 220         return 0;
 221 }
 222
 223 U_BOOT_CMD(
 224         test_fdtdec, 3, 1, do_test_fdtdec,
 225         "test_fdtdec",
 226         "Run tests for fdtdec library");