1 /*
2 * Copyright (c) 2019-2021, Arm Limited. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6 #include <assert.h>
7
8 #include <common/bl_common.h>
9 #include <common/debug.h>
10 #include <common/fdt_wrappers.h>
11 #include <lib/fconf/fconf_tbbr_getter.h>
12 #include <libfdt.h>
13
14 struct tbbr_dyn_config_t tbbr_dyn_config;
15
fconf_populate_tbbr_dyn_config(uintptr_t config)16 int fconf_populate_tbbr_dyn_config(uintptr_t config)
17 {
18 int err;
19 int node;
20 uint64_t val64;
21 uint32_t val32;
22
23 /* As libfdt use void *, we can't avoid this cast */
24 const void *dtb = (void *)config;
25
26 /* Assert the node offset point to "arm,tb_fw" compatible property */
27 const char *compatible_str = "arm,tb_fw";
28 node = fdt_node_offset_by_compatible(dtb, -1, compatible_str);
29 if (node < 0) {
30 ERROR("FCONF: Can't find `%s` compatible in dtb\n",
31 compatible_str);
32 return node;
33 }
34
35 /* Locate the disable_auth cell and read the value */
36 err = fdt_read_uint32(dtb, node, "disable_auth",
37 &tbbr_dyn_config.disable_auth);
38 if (err < 0) {
39 WARN("FCONF: Read %s failed for `%s`\n",
40 "cell", "disable_auth");
41 return err;
42 }
43
44 /* Check if the value is boolean */
45 if ((tbbr_dyn_config.disable_auth != 0U) &&
46 (tbbr_dyn_config.disable_auth != 1U)) {
47 WARN("Invalid value for `%s` cell %d\n",
48 "disable_auth", tbbr_dyn_config.disable_auth);
49 return -1;
50 }
51
52 #if defined(DYN_DISABLE_AUTH)
53 if (tbbr_dyn_config.disable_auth == 1)
54 dyn_disable_auth();
55 #endif
56
57 /* Retrieve the Mbed TLS heap details from the DTB */
58 err = fdt_read_uint64(dtb, node, "mbedtls_heap_addr", &val64);
59 if (err < 0) {
60 ERROR("FCONF: Read %s failed for `%s`\n",
61 "cell", "mbedtls_heap_addr");
62 return err;
63 }
64 tbbr_dyn_config.mbedtls_heap_addr = (void *)(uintptr_t)val64;
65
66 err = fdt_read_uint32(dtb, node, "mbedtls_heap_size", &val32);
67 if (err < 0) {
68 ERROR("FCONF: Read %s failed for `%s`\n",
69 "cell", "mbedtls_heap_size");
70 return err;
71 }
72 tbbr_dyn_config.mbedtls_heap_size = val32;
73
74 VERBOSE("%s%s%s %d\n", "FCONF: `tbbr.", "disable_auth",
75 "` cell found with value =", tbbr_dyn_config.disable_auth);
76 VERBOSE("%s%s%s %p\n", "FCONF: `tbbr.", "mbedtls_heap_addr",
77 "` cell found with value =", tbbr_dyn_config.mbedtls_heap_addr);
78 VERBOSE("%s%s%s %zu\n", "FCONF: `tbbr.", "mbedtls_heap_size",
79 "` cell found with value =", tbbr_dyn_config.mbedtls_heap_size);
80
81 return 0;
82 }
83
84 FCONF_REGISTER_POPULATOR(TB_FW, tbbr, fconf_populate_tbbr_dyn_config);
85