blob: cfcbf2a2a891bf9749d6240f7b6eae75ae9bc17f [file] [log] [blame]
/*
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <desc_image_load.h>
#include <fdt_wrappers.h>
#include <libfdt.h>
#include <plat_arm.h>
/*******************************************************************************
* Helper to read the `hw_config` property in config DTB. This function
* expects the following properties to be present in the config DTB.
* name : hw_config_addr size : 2 cells
* name : hw_config_max_size size : 1 cell
*
* Arguments:
* void *dtb - pointer to the TB_FW_CONFIG in memory
* int node - The node offset to appropriate node in the
* DTB.
* uint64_t *hw_config_addr - Returns the `hw_config` load address if read
* is successful.
* uint32_t *hw_config_size - Returns the `hw_config` size if read is
* successful.
*
* Returns 0 on success and -1 on error.
******************************************************************************/
int arm_dyn_get_hwconfig_info(void *dtb, int node,
uint64_t *hw_config_addr, uint32_t *hw_config_size)
{
int err;
assert(dtb != NULL);
assert(hw_config_addr != NULL);
assert(hw_config_size != NULL);
/* Check if the pointer to DT is correct */
assert(fdt_check_header(dtb) == 0);
/* Assert the node offset point to "arm,tb_fw" compatible property */
assert(node == fdt_node_offset_by_compatible(dtb, -1, "arm,tb_fw"));
err = fdtw_read_cells(dtb, node, "hw_config_addr", 2,
(void *) hw_config_addr);
if (err < 0) {
WARN("Read cell failed for hw_config_addr\n");
return -1;
}
err = fdtw_read_cells(dtb, node, "hw_config_max_size", 1,
(void *) hw_config_size);
if (err < 0) {
WARN("Read cell failed for hw_config_max_size\n");
return -1;
}
VERBOSE("Dyn cfg: Read hw_config address from TB_FW_CONFIG 0x%p %p\n",
hw_config_addr, hw_config_size);
return 0;
}
/*******************************************************************************
* Validate the tb_fw_config is a valid DTB file and returns the node offset
* to "arm,tb_fw" property.
* Arguments:
* void *dtb - pointer to the TB_FW_CONFIG in memory
* int *node - Returns the node offset to "arm,tb_fw" property if found.
*
* Returns 0 on success and -1 on error.
******************************************************************************/
int arm_dyn_tb_fw_cfg_init(void *dtb, int *node)
{
assert(dtb != NULL);
assert(node != NULL);
/* Check if the pointer to DT is correct */
if (fdt_check_header(dtb) != 0) {
WARN("Invalid DTB file passed as TB_FW_CONFIG\n");
return -1;
}
/* Assert the node offset point to "arm,tb_fw" compatible property */
*node = fdt_node_offset_by_compatible(dtb, -1, "arm,tb_fw");
if (*node < 0) {
WARN("The compatible property `arm,tb_fw` not found in the config\n");
return -1;
}
VERBOSE("Dyn cfg: Found \"arm,tb_fw\" in the config\n");
return 0;
}