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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* libfdt - Flat Device Tree manipulation
* Testcase for DT overlays()
* Copyright (C) 2016 Free Electrons
* Copyright (C) 2016 NextThing Co.
*/
#include <stdio.h>
#include <libfdt.h>
#include "tests.h"
#define CHECK(code) \
{ \
int err = (code); \
if (err) \
FAIL(#code ": %s", fdt_strerror(err)); \
}
/* 4k ought to be enough for anybody */
#define FDT_COPY_SIZE (4 * 1024)
static int fdt_getprop_u32_by_poffset(void *fdt, const char *path,
const char *name, int poffset,
unsigned long *out)
{
const fdt32_t *val;
int node_off;
int len;
node_off = fdt_path_offset(fdt, path);
if (node_off < 0)
return node_off;
val = fdt_getprop(fdt, node_off, name, &len);
if (val && len < 0)
FAIL("fdt_getprop() returns negative length");
if (!val && len < 0)
return len;
if (!val || ((unsigned)len < (sizeof(uint32_t) * (poffset + 1))))
return -FDT_ERR_NOTFOUND;
*out = fdt32_to_cpu(*(val + poffset));
return 0;
}
static int check_getprop_string_by_name(void *fdt, const char *path,
const char *name, const char *val)
{
int node_off;
node_off = fdt_path_offset(fdt, path);
if (node_off < 0)
return node_off;
check_getprop_string(fdt, node_off, name, val);
return 0;
}
static int check_getprop_u32_by_name(void *fdt, const char *path,
const char *name, uint32_t val)
{
int node_off;
node_off = fdt_path_offset(fdt, path);
CHECK(node_off < 0);
check_getprop_cell(fdt, node_off, name, val);
return 0;
}
static int check_getprop_null_by_name(void *fdt, const char *path,
const char *name)
{
int node_off;
node_off = fdt_path_offset(fdt, path);
CHECK(node_off < 0);
check_property(fdt, node_off, name, 0, NULL);
return 0;
}
static int fdt_overlay_change_int_property(void *fdt)
{
return check_getprop_u32_by_name(fdt, "/test-node", "test-int-property",
43);
}
static int fdt_overlay_change_str_property(void *fdt)
{
return check_getprop_string_by_name(fdt, "/test-node",
"test-str-property", "foobar");
}
static int fdt_overlay_add_str_property(void *fdt)
{
return check_getprop_string_by_name(fdt, "/test-node",
"test-str-property-2", "foobar2");
}
static int fdt_overlay_add_node(void *fdt)
{
return check_getprop_null_by_name(fdt, "/test-node/new-node",
"new-property");
}
static int fdt_overlay_add_subnode_property(void *fdt)
{
check_getprop_null_by_name(fdt, "/test-node/sub-test-node",
"sub-test-property");
check_getprop_null_by_name(fdt, "/test-node/sub-test-node",
"new-sub-test-property");
return 0;
}
static int fdt_overlay_local_phandle(void *fdt)
{
uint32_t local_phandle;
unsigned long val = 0;
int off;
off = fdt_path_offset(fdt, "/test-node/new-local-node");
CHECK(off < 0);
local_phandle = fdt_get_phandle(fdt, off);
CHECK(!local_phandle);
CHECK(fdt_getprop_u32_by_poffset(fdt, "/test-node",
"test-several-phandle",
0, &val));
CHECK(val != local_phandle);
CHECK(fdt_getprop_u32_by_poffset(fdt, "/test-node",
"test-several-phandle",
1, &val));
CHECK(val != local_phandle);
return 0;
}
static int fdt_overlay_local_phandles(void *fdt)
{
uint32_t local_phandle, test_phandle;
unsigned long val = 0;
int off;
off = fdt_path_offset(fdt, "/test-node/new-local-node");
CHECK(off < 0);
local_phandle = fdt_get_phandle(fdt, off);
CHECK(!local_phandle);
off = fdt_path_offset(fdt, "/test-node");
CHECK(off < 0);
test_phandle = fdt_get_phandle(fdt, off);
CHECK(!test_phandle);
CHECK(fdt_getprop_u32_by_poffset(fdt, "/test-node",
"test-phandle", 0, &val));
CHECK(test_phandle != val);
CHECK(fdt_getprop_u32_by_poffset(fdt, "/test-node",
"test-phandle", 1, &val));
CHECK(local_phandle != val);
return 0;
}
static void *open_dt(char *path)
{
void *dt, *copy;
dt = load_blob(path);
copy = xmalloc(FDT_COPY_SIZE);
/*
* Resize our DTs to 4k so that we have room to operate on
*/
CHECK(fdt_open_into(dt, copy, FDT_COPY_SIZE));
return copy;
}
int main(int argc, char *argv[])
{
void *fdt_base, *fdt_overlay;
test_init(argc, argv);
if (argc != 3)
CONFIG("Usage: %s <base dtb> <overlay dtb>", argv[0]);
fdt_base = open_dt(argv[1]);
fdt_overlay = open_dt(argv[2]);
/* Apply the overlay */
CHECK(fdt_overlay_apply(fdt_base, fdt_overlay));
fdt_overlay_change_int_property(fdt_base);
fdt_overlay_change_str_property(fdt_base);
fdt_overlay_add_str_property(fdt_base);
fdt_overlay_add_node(fdt_base);
fdt_overlay_add_subnode_property(fdt_base);
/*
* If the base tree has a __symbols__ node, do the tests that
* are only successful with a proper phandle support, and thus
* dtc -@
*/
if (fdt_path_offset(fdt_base, "/__symbols__") >= 0) {
fdt_overlay_local_phandle(fdt_base);
fdt_overlay_local_phandles(fdt_base);
}
PASS();
}
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