soc: realtek: Add image generate tool for RTS5817

Add tool to genarate images of RTS5817 after post build stage

Signed-off-by: Darcy Lu <darcy_lu@realsil.com.cn>

Author: RtkFP

soc/realtek/fingerprint/CMakeLists.txt

@@ -1,4 +1,5 @@
 # Copyright (c) 2024 Realtek Semiconductor, Inc.
 # SPDX-License-Identifier: Apache-2.0
 
+add_subdirectory(common)
 add_subdirectory(${SOC_SERIES})

soc/realtek/fingerprint/common/CMakeLists.txt

@@ -0,0 +1,20 @@
+# Copyright (c) 2024 Realtek Semiconductor, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(.)
+
+set(RTS_BIN_NAME ${CONFIG_KERNEL_BIN_NAME}.rts5817.bin)
+string(TOUPPER "${SOC_NAME}" soc_name_upper)
+
+if(APPVERSION)
+  set(VERSION ${APPVERSION})
+else()
+  set(VERSION 0)
+endif()
+
+set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
+  COMMAND ${PYTHON_EXECUTABLE} ${SOC_${soc_name_upper}_DIR}/common/tool/gen_download_bin.py
+  -i ${KERNEL_BIN_NAME}
+  -o ${RTS_BIN_NAME}
+  -v ${VERSION}
+)

soc/realtek/fingerprint/common/tool/gen_download_bin.py

@@ -0,0 +1,164 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2024 Realtek Semiconductor, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import argparse
+import hashlib
+import pathlib
+import sys
+
+PATCH_FLAG = 0x3
+PATCH_FLAG_OFFSET = 0x0
+PATCH_FLAG_LEN = 0x4
+PATCH_IMG_SIZE_OFFSET = 0x4
+PATCH_IMG_SIZE_LEN = 0x2
+
+PATCH_CONFIG_LEN = 0x50
+PATCH_RESERVED_LEN = 0xF70
+PATCH_SHA_LEN = 0x20
+PATCH_PADDING_LEN = 0x20
+
+IMG_HEADER_FLAG = 0x2
+IMG_HEADER_FLAG_OFFSET = 0x0
+IMG_HEADER_FLAG_LEN = 0x4
+IMG_HEADER_VER_OFFSET = 0x4
+IMG_HEADER_VER_LEN = 0x4
+IMG_HEADER_RESERVED_LEN = 0xF8
+
+IMG_SIZE_UNIT = 0x1000
+IMG_SHA_LEN = 0x20
+IMG_REAR_PADDING_LEN = 0x60
+
+
+def create_parser(arg_list):
+    """create argument parser according to pre-defined arguments
+
+    :param arg_list: when empty, parses command line arguments,
+    else parses the given string
+    """
+    parser = argparse.ArgumentParser(conflict_handler='resolve', allow_abbrev=False)
+    parser.add_argument("--input", "-i", nargs='?', dest="input")
+    parser.add_argument("--output", "-o", nargs='?', dest="output")
+    parser.add_argument("--version", "-v", type=lambda x: int(x, 16), dest="version")
+
+    args = parser.parse_known_args(arg_list.split())
+
+    if arg_list == "":
+        args = parser.parse_known_args()
+
+    return args
+
+
+def file_check(input, output=None):
+    """check input and output files
+    If the input file is not exists or empty, raise error
+
+    :param input: the input file object
+    :param output: the output file object
+    """
+    if not input.exists():
+        raise RuntimeError(f'Input file ({input}) is not exists')
+    elif input.stat().st_size == 0:
+        raise RuntimeError(f'Input file ({input}) is empty')
+
+    if output is None:
+        output = ['out_', input]
+
+    if output.exists():
+        if output.samefile(input):
+            raise RuntimeError(f'Input file {input} should be different from Output file {output}')
+        output.unlink()
+
+    output.touch()
+    return output
+
+
+def gen_rompatch(img_len):
+    """generate rom patch for image
+
+    :param img_len: the length of image
+    """
+    patch_config = bytearray([0x0] * PATCH_CONFIG_LEN)
+    patch_config[PATCH_FLAG_OFFSET] = PATCH_FLAG
+    patch_config[PATCH_IMG_SIZE_OFFSET] = img_len
+    patch_reserved = bytearray([0xFF] * PATCH_RESERVED_LEN)
+    patch = patch_config + patch_reserved
+    patch_sha = hashlib.sha256(patch).digest()
+    patch += patch_sha
+    patch_padding = bytearray([0xFF] * PATCH_PADDING_LEN)
+    patch += patch_padding
+    return patch
+
+
+def gen_img_header(img_version=0):
+    """generate rom patch for image
+
+    :param img_version: the version of image
+    """
+    img_header = IMG_HEADER_FLAG.to_bytes(IMG_HEADER_FLAG_LEN, "little")
+    img_header += img_version.to_bytes(IMG_HEADER_VER_LEN, "little")
+    img_header += bytearray([0xFF] * IMG_HEADER_RESERVED_LEN)
+    return img_header
+
+
+def img_padding(img):
+    size = len(img) // IMG_SIZE_UNIT
+    rear = len(img) % IMG_SIZE_UNIT
+
+    if rear <= IMG_SIZE_UNIT - IMG_SHA_LEN - IMG_REAR_PADDING_LEN:
+        size += 1
+        padding_len = IMG_SIZE_UNIT - rear - IMG_SHA_LEN - IMG_REAR_PADDING_LEN
+    else:
+        size += 2
+        padding_len = 2 * IMG_SIZE_UNIT - rear - IMG_SHA_LEN - IMG_REAR_PADDING_LEN
+
+    img_with_padding = img + bytes([0xFF] * padding_len)
+    return size, img_with_padding
+
+
+def main():
+    """main of the application"""
+
+    if len(sys.argv) < 3:
+        sys.exit()
+
+    input_file = None
+    output_file = None
+    fw_version = 0x0
+
+    # parser input arguments
+    arguments = create_parser("")
+    for arg in vars(arguments[0]):
+        if (arg == "input") & (arguments[0].input is not None):
+            input_file = arguments[0].input
+        elif (arg == "output") & (arguments[0].output is not None):
+            output_file = arguments[0].output
+        elif (arg == "version") & (arguments[0].version is not None):
+            fw_version = arguments[0].version
+
+    # check file
+    output_file = file_check(pathlib.Path(input_file), pathlib.Path(output_file))
+
+    # generate image header
+    header = gen_img_header(fw_version)
+
+    with open(input_file, 'rb') as origin_img_file:
+        # start handling
+        origin_img = origin_img_file.read()
+        img_with_header = header + origin_img
+        img_size, img_with_padding = img_padding(img_with_header)
+        img_sha = hashlib.sha256(img_with_padding).digest()
+        img_with_sha = img_with_padding + img_sha
+        rompatch = gen_rompatch(img_size)
+        final_img = rompatch + img_with_sha + bytes([0xFF] * IMG_REAR_PADDING_LEN)
+        origin_img_file.close()
+
+    with open(output_file, 'wb') as new_fw:
+        new_fw.write(final_img)
+        new_fw.close()
+
+
+if __name__ == '__main__':
+    main()