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/*
* Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2022, Linaro.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <arch_helpers.h>
#if MEASURED_BOOT
#include <common/desc_image_load.h>
#endif
#include <common/fdt_wrappers.h>
#include <libfdt.h>
#include <platform_def.h>
#define DTB_PROP_HW_LOG_ADDR "tpm_event_log_addr"
#define DTB_PROP_HW_LOG_SIZE "tpm_event_log_size"
#if MEASURED_BOOT
static int imx8m_event_log_fdt_init_overlay(uintptr_t dt_base, int dt_size)
{
int ret;
int offset;
void *dtb = (void *)dt_base;
ret = fdt_create_empty_tree(dtb, dt_size);
if (ret < 0) {
ERROR("cannot create empty dtb tree: %s\n",
fdt_strerror(ret));
return ret;
}
offset = fdt_path_offset(dtb, "/");
if (offset < 0) {
ERROR("cannot find root of the tree: %s\n",
fdt_strerror(offset));
return offset;
}
offset = fdt_add_subnode(dtb, offset, "fragment@0");
if (offset < 0) {
ERROR("cannot add fragment node: %s\n",
fdt_strerror(offset));
return offset;
}
ret = fdt_setprop_string(dtb, offset, "target-path", "/");
if (ret < 0) {
ERROR("cannot set target-path property: %s\n",
fdt_strerror(ret));
return ret;
}
offset = fdt_add_subnode(dtb, offset, "__overlay__");
if (offset < 0) {
ERROR("cannot add __overlay__ node: %s\n",
fdt_strerror(offset));
return ret;
}
offset = fdt_add_subnode(dtb, offset, "tpm_event_log");
if (offset < 0) {
ERROR("cannot add tpm_event_log node: %s\n",
fdt_strerror(offset));
return offset;
}
ret = fdt_setprop_string(dtb, offset, "compatible",
"arm,tpm_event_log");
if (ret < 0) {
ERROR("cannot set compatible property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = fdt_setprop_u64(dtb, offset, "tpm_event_log_addr", 0);
if (ret < 0) {
ERROR("cannot set tpm_event_log_addr property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = fdt_setprop_u32(dtb, offset, "tpm_event_log_size", 0);
if (ret < 0) {
ERROR("cannot set tpm_event_log_size property: %s\n",
fdt_strerror(ret));
return ret;
}
return ret;
}
/*
* Write the Event Log address and its size in the DTB.
*
* This function is supposed to be called only by BL2.
*
* Returns:
* 0 = success
* < 0 = error
*/
static int imx8m_set_event_log_info(uintptr_t config_base,
uintptr_t log_addr, size_t log_size)
{
/* As libfdt uses void *, we can't avoid this cast */
void *dtb = (void *)config_base;
const char *compatible_tpm = "arm,tpm_event_log";
uint64_t base = cpu_to_fdt64(log_addr);
uint32_t sz = cpu_to_fdt32(log_size);
int err, node;
err = fdt_open_into(dtb, dtb, PLAT_IMX8M_DTO_MAX_SIZE);
if (err < 0) {
ERROR("Invalid Device Tree at %p: error %d\n", dtb, err);
return err;
}
/*
* Verify that the DTB is valid, before attempting to write to it,
* and get the DTB root node.
*/
/* Check if the pointer to DT is correct */
err = fdt_check_header(dtb);
if (err < 0) {
WARN("Invalid DTB file passed\n");
return err;
}
/*
* Find the TPM node in device tree.
*/
node = fdt_node_offset_by_compatible(dtb, -1, compatible_tpm);
if (node < 0) {
ERROR("The compatible property '%s' not%s", compatible_tpm,
" found in the config\n");
return node;
}
err = fdt_setprop(dtb, node, DTB_PROP_HW_LOG_ADDR, &base, 8);
if (err < 0) {
ERROR("Failed to add log addr err %d\n", err);
return err;
}
err = fdt_setprop(dtb, node, DTB_PROP_HW_LOG_SIZE, &sz, 4);
if (err < 0) {
ERROR("Failed to add log addr err %d\n", err);
return err;
}
err = fdt_pack(dtb);
if (err < 0) {
ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, err);
return err;
}
/*
* Ensure that the info written to the DTB is visible
* to other images.
*/
flush_dcache_range(config_base, fdt_totalsize(dtb));
return err;
}
/*
* This function writes the Event Log address and its size
* in the QEMU DTB.
*
* This function is supposed to be called only by BL2.
*
* Returns:
* 0 = success
* < 0 = error
*/
int imx8m_set_nt_fw_info(size_t log_size, uintptr_t *ns_log_addr)
{
uintptr_t ns_addr;
int err;
assert(ns_log_addr != NULL);
ns_addr = PLAT_IMX8M_DTO_BASE + PLAT_IMX8M_DTO_MAX_SIZE;
imx8m_event_log_fdt_init_overlay(PLAT_IMX8M_DTO_BASE,
PLAT_IMX8M_DTO_MAX_SIZE);
/* Write the Event Log address and its size in the DTB */
err = imx8m_set_event_log_info(PLAT_IMX8M_DTO_BASE,
ns_addr, log_size);
/* Return Event Log address in Non-secure memory */
*ns_log_addr = (err < 0) ? 0UL : ns_addr;
return err;
}
#endif /* MEASURED_BOOT */
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