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