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// SPDX-License-Identifier: GPL-2.0+
/*
* Some very basic tests for fdtdec, accessed through test_fdtdec command.
* They are easiest to use with sandbox.
*
* Copyright (c) 2011 The Chromium OS Authors.
*/
#include <common.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <os.h>
/* The size of our test fdt blob */
#define FDT_SIZE (16 * 1024)
/**
* Check if an operation failed, and if so, print an error
*
* @param oper_name Name of operation
* @param err Error code to check
*
* @return 0 if ok, -1 if there was an error
*/
static int fdt_checkerr(const char *oper_name, int err)
{
if (err) {
printf("%s: %s: %s\n", __func__, oper_name, fdt_strerror(err));
return -1;
}
return 0;
}
/**
* Check the result of an operation and if incorrect, print an error
*
* @param oper_name Name of operation
* @param expected Expected value
* @param value Actual value
*
* @return 0 if ok, -1 if there was an error
*/
static int checkval(const char *oper_name, int expected, int value)
{
if (expected != value) {
printf("%s: %s: expected %d, but returned %d\n", __func__,
oper_name, expected, value);
return -1;
}
return 0;
}
#define CHECK(op) if (fdt_checkerr(#op, op)) return -1
#define CHECKVAL(op, expected) \
if (checkval(#op, expected, op)) \
return -1
#define CHECKOK(op) CHECKVAL(op, 0)
/* maximum number of nodes / aliases to generate */
#define MAX_NODES 20
/*
* Make a test fdt
*
* @param fdt Device tree pointer
* @param size Size of device tree blob
* @param aliases Specifies alias assignments. Format is a list of items
* separated by space. Items are #a where
* # is the alias number
* a is the node to point to
* @param nodes Specifies nodes to generate (a=0, b=1), upper case
* means to create a disabled node
*/
static int make_fdt(void *fdt, int size, const char *aliases,
const char *nodes)
{
char name[20], value[20];
const char *s;
int fd;
CHECK(fdt_create(fdt, size));
CHECK(fdt_finish_reservemap(fdt));
CHECK(fdt_begin_node(fdt, ""));
CHECK(fdt_begin_node(fdt, "aliases"));
for (s = aliases; *s;) {
sprintf(name, "i2c%c", *s);
sprintf(value, "/i2c%d@0", s[1] - 'a');
CHECK(fdt_property_string(fdt, name, value));
s += 2 + (s[2] != '\0');
}
CHECK(fdt_end_node(fdt));
for (s = nodes; *s; s++) {
sprintf(value, "i2c%d@0", (*s & 0xdf) - 'A');
CHECK(fdt_begin_node(fdt, value));
CHECK(fdt_property_string(fdt, "compatible",
fdtdec_get_compatible(COMPAT_UNKNOWN)));
if (*s <= 'Z')
CHECK(fdt_property_string(fdt, "status", "disabled"));
CHECK(fdt_end_node(fdt));
}
CHECK(fdt_end_node(fdt));
CHECK(fdt_finish(fdt));
CHECK(fdt_pack(fdt));
#if defined(DEBUG) && defined(CONFIG_SANDBOX)
fd = os_open("/tmp/fdtdec-text.dtb", OS_O_CREAT | OS_O_WRONLY);
if (fd == -1) {
printf("Could not open .dtb file to write\n");
return -1;
}
os_write(fd, fdt, size);
os_close(fd);
#endif
return 0;
}
static int run_test(const char *aliases, const char *nodes, const char *expect)
{
int list[MAX_NODES];
const char *s;
void *blob;
int i;
blob = malloc(FDT_SIZE);
if (!blob) {
printf("%s: out of memory\n", __func__);
return 1;
}
printf("aliases=%s, nodes=%s, expect=%s: ", aliases, nodes, expect);
CHECKVAL(make_fdt(blob, FDT_SIZE, aliases, nodes), 0);
CHECKVAL(fdtdec_find_aliases_for_id(blob, "i2c",
COMPAT_UNKNOWN,
list, ARRAY_SIZE(list)), strlen(expect));
/* Check we got the right ones */
for (i = 0, s = expect; *s; s++, i++) {
int want = *s;
const char *name;
int got = ' ';
name = list[i] ? fdt_get_name(blob, list[i], NULL) : NULL;
if (name)
got = name[3] + 'a' - '0';
if (got != want) {
printf("Position %d: Expected '%c', got '%c' ('%s')\n",
i, want, got, name);
return 1;
}
}
printf("pass\n");
return 0;
}
static int do_test_fdtdec(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
/* basic tests */
CHECKOK(run_test("", "", ""));
CHECKOK(run_test("1e 3d", "", ""));
/*
* 'a' represents 0, 'b' represents 1, etc.
* The first character is the alias number, the second is the node
* number. So the params mean:
* 0a 1b : point alias 0 to node 0 (a), alias 1 to node 1(b)
* ab : to create nodes 0 and 1 (a and b)
* ab : we expect the function to return two nodes, in
* the order 0, 1
*/
CHECKOK(run_test("0a 1b", "ab", "ab"));
CHECKOK(run_test("0a 1c", "ab", "ab"));
CHECKOK(run_test("1c", "ab", "ab"));
CHECKOK(run_test("1b", "ab", "ab"));
CHECKOK(run_test("0b", "ab", "ba"));
CHECKOK(run_test("0b 2d", "dbc", "bcd"));
CHECKOK(run_test("0d 3a 1c 2b", "dbac", "dcba"));
/* things with holes */
CHECKOK(run_test("1b 3d", "dbc", "cb d"));
CHECKOK(run_test("1e 3d", "dbc", "bc d"));
/* no aliases */
CHECKOK(run_test("", "dbac", "dbac"));
/* disabled nodes */
CHECKOK(run_test("0d 3a 1c 2b", "dBac", "dc a"));
CHECKOK(run_test("0b 2d", "DBc", "c"));
CHECKOK(run_test("0b 4d 2c", "DBc", " c"));
/* conflicting aliases - first one gets it */
CHECKOK(run_test("2a 1a 0a", "a", " a"));
CHECKOK(run_test("0a 1a 2a", "a", "a"));
printf("Test passed\n");
return 0;
}
U_BOOT_CMD(
test_fdtdec, 3, 1, do_test_fdtdec,
"test_fdtdec",
"Run tests for fdtdec library");
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