blob: ba612e2e9333a08539bea99944bc91036e745212 [file] [log] [blame]
/*
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <platform_def.h>
#include <common/debug.h>
#include <drivers/io/io_driver.h>
#include <drivers/io/io_storage.h>
#include <drivers/st/io_stm32image.h>
#include <lib/utils.h>
#include <plat/common/platform.h>
#include <boot_api.h>
static uintptr_t backend_dev_handle;
static uintptr_t backend_image_spec;
static uint32_t *stm32_img;
static uint8_t first_lba_buffer[MAX_LBA_SIZE] __aligned(4);
static struct stm32image_part_info *current_part;
/* STM32 Image driver functions */
static int stm32image_dev_open(const uintptr_t init_params,
io_dev_info_t **dev_info);
static int stm32image_partition_open(io_dev_info_t *dev_info,
const uintptr_t spec, io_entity_t *entity);
static int stm32image_partition_size(io_entity_t *entity, size_t *length);
static int stm32image_partition_read(io_entity_t *entity, uintptr_t buffer,
size_t length, size_t *length_read);
static int stm32image_partition_close(io_entity_t *entity);
static int stm32image_dev_init(io_dev_info_t *dev_info,
const uintptr_t init_params);
static int stm32image_dev_close(io_dev_info_t *dev_info);
/* Identify the device type as a virtual driver */
static io_type_t device_type_stm32image(void)
{
return IO_TYPE_STM32IMAGE;
}
static const io_dev_connector_t stm32image_dev_connector = {
.dev_open = stm32image_dev_open
};
static const io_dev_funcs_t stm32image_dev_funcs = {
.type = device_type_stm32image,
.open = stm32image_partition_open,
.size = stm32image_partition_size,
.read = stm32image_partition_read,
.close = stm32image_partition_close,
.dev_init = stm32image_dev_init,
.dev_close = stm32image_dev_close,
};
static io_dev_info_t stm32image_dev_info = {
.funcs = &stm32image_dev_funcs,
.info = (uintptr_t)0,
};
static struct stm32image_device_info stm32image_dev;
static int get_part_idx_by_binary_type(uint32_t binary_type)
{
int i;
for (i = 0; i < STM32_PART_NUM; i++) {
if (stm32image_dev.part_info[i].binary_type == binary_type) {
return i;
}
}
return -EINVAL;
}
/* Open a connection to the STM32IMAGE device */
static int stm32image_dev_open(const uintptr_t init_params,
io_dev_info_t **dev_info)
{
int i;
struct stm32image_device_info *device_info =
(struct stm32image_device_info *)init_params;
assert(dev_info != NULL);
*dev_info = (io_dev_info_t *)&stm32image_dev_info;
stm32image_dev.device_size = device_info->device_size;
stm32image_dev.lba_size = device_info->lba_size;
for (i = 0; i < STM32_PART_NUM; i++) {
memcpy(stm32image_dev.part_info[i].name,
device_info->part_info[i].name, MAX_PART_NAME_SIZE);
stm32image_dev.part_info[i].part_offset =
device_info->part_info[i].part_offset;
stm32image_dev.part_info[i].bkp_offset =
device_info->part_info[i].bkp_offset;
}
return 0;
}
/* Do some basic package checks */
static int stm32image_dev_init(io_dev_info_t *dev_info,
const uintptr_t init_params)
{
int result;
if ((backend_dev_handle != 0U) || (backend_image_spec != 0U)) {
ERROR("STM32 Image io supports only one session\n");
return -ENOMEM;
}
/* Obtain a reference to the image by querying the platform layer */
result = plat_get_image_source(STM32_IMAGE_ID, &backend_dev_handle,
&backend_image_spec);
if (result != 0) {
ERROR("STM32 image error (%i)\n", result);
return -EINVAL;
}
return result;
}
/* Close a connection to the STM32 Image device */
static int stm32image_dev_close(io_dev_info_t *dev_info)
{
backend_dev_handle = 0U;
backend_image_spec = 0U;
stm32_img = NULL;
return 0;
}
/* Open a partition */
static int stm32image_partition_open(io_dev_info_t *dev_info,
const uintptr_t spec, io_entity_t *entity)
{
const struct stm32image_part_info *partition_spec;
int idx;
assert(entity != NULL);
partition_spec = (struct stm32image_part_info *)spec;
assert(partition_spec != NULL);
idx = get_part_idx_by_binary_type(partition_spec->binary_type);
if ((idx < 0) || (idx > STM32_PART_NUM)) {
ERROR("Wrong partition index (%d)\n", idx);
return -EINVAL;
}
current_part = &stm32image_dev.part_info[idx];
stm32_img = (uint32_t *)&current_part->part_offset;
return 0;
}
/* Return the size of a partition */
static int stm32image_partition_size(io_entity_t *entity, size_t *length)
{
int result;
uintptr_t backend_handle;
size_t bytes_read;
boot_api_image_header_t *header =
(boot_api_image_header_t *)first_lba_buffer;
assert(entity != NULL);
assert(length != NULL);
/* Attempt to access the image */
result = io_open(backend_dev_handle, backend_image_spec,
&backend_handle);
if (result < 0) {
ERROR("%s: io_open (%i)\n", __func__, result);
return result;
}
/* Reset magic header value */
header->magic = 0;
while (header->magic == 0U) {
result = io_seek(backend_handle, IO_SEEK_SET, *stm32_img);
if (result != 0) {
ERROR("%s: io_seek (%i)\n", __func__, result);
break;
}
result = io_read(backend_handle, (uintptr_t)header,
MAX_LBA_SIZE, (size_t *)&bytes_read);
if (result != 0) {
ERROR("%s: io_read (%i)\n", __func__, result);
break;
}
if ((header->magic != BOOT_API_IMAGE_HEADER_MAGIC_NB) ||
(header->binary_type != current_part->binary_type) ||
(header->image_length >= stm32image_dev.device_size)) {
WARN("%s: partition %s wrong header\n",
__func__, current_part->name);
/* Header not correct, check next offset for backup */
*stm32_img += current_part->bkp_offset;
if (*stm32_img > stm32image_dev.device_size) {
/* No backup found, end of device reached */
WARN("Out of memory\n");
result = -ENOMEM;
break;
}
header->magic = 0;
}
}
io_close(backend_handle);
if (result != 0) {
return result;
}
*length = header->image_length;
INFO("STM32 Image size : %i\n", *length);
return 0;
}
static int check_header(boot_api_image_header_t *header, uintptr_t buffer)
{
uint32_t i;
uint32_t img_checksum = 0;
/*
* Check header/payload validity:
* - Header magic
* - Header version
* - Payload checksum
*/
if (header->magic != BOOT_API_IMAGE_HEADER_MAGIC_NB) {
ERROR("Header magic\n");
return -EINVAL;
}
if (header->header_version != BOOT_API_HEADER_VERSION) {
ERROR("Header version\n");
return -EINVAL;
}
for (i = 0; i < header->image_length; i++) {
img_checksum += *(uint8_t *)(buffer + i);
}
if (header->payload_checksum != img_checksum) {
ERROR("Checksum: 0x%x (awaited: 0x%x)\n", img_checksum,
header->payload_checksum);
return -EINVAL;
}
return 0;
}
/* Read data from a partition */
static int stm32image_partition_read(io_entity_t *entity, uintptr_t buffer,
size_t length, size_t *length_read)
{
int result = 0, offset, local_length = 0;
uint8_t *local_buffer = (uint8_t *)buffer;
boot_api_image_header_t *header =
(boot_api_image_header_t *)first_lba_buffer;
uintptr_t backend_handle;
assert(entity != NULL);
assert(buffer != 0U);
assert(length_read != NULL);
*length_read = 0U;
while (*length_read == 0U) {
if (header->magic != BOOT_API_IMAGE_HEADER_MAGIC_NB) {
/* Check for backup as image is corrupted */
*stm32_img += current_part->bkp_offset;
if (*stm32_img >= stm32image_dev.device_size) {
/* End of device reached */
result = -ENOMEM;
break;
}
local_buffer = (uint8_t *)buffer;
result = stm32image_partition_size(entity, &length);
if (result != 0) {
break;
}
}
/* Part of image already loaded with the header */
memcpy(local_buffer, (uint8_t *)first_lba_buffer +
sizeof(boot_api_image_header_t),
MAX_LBA_SIZE - sizeof(boot_api_image_header_t));
local_buffer += MAX_LBA_SIZE - sizeof(boot_api_image_header_t);
offset = MAX_LBA_SIZE;
/* New image length to be read */
local_length = round_up(length -
((MAX_LBA_SIZE) -
sizeof(boot_api_image_header_t)),
stm32image_dev.lba_size);
if ((header->load_address != 0U) &&
(header->load_address != buffer)) {
ERROR("Wrong load address\n");
panic();
}
result = io_open(backend_dev_handle, backend_image_spec,
&backend_handle);
if (result != 0) {
ERROR("%s: io_open (%i)\n", __func__, result);
break;
}
result = io_seek(backend_handle, IO_SEEK_SET,
*stm32_img + offset);
if (result != 0) {
ERROR("%s: io_seek (%i)\n", __func__, result);
*length_read = 0;
io_close(backend_handle);
break;
}
result = io_read(backend_handle, (uintptr_t)local_buffer,
local_length, length_read);
/* Adding part of size already read from header */
*length_read += MAX_LBA_SIZE - sizeof(boot_api_image_header_t);
if (result != 0) {
ERROR("%s: io_read (%i)\n", __func__, result);
*length_read = 0;
io_close(backend_handle);
break;
}
result = check_header(header, buffer);
if (result != 0) {
ERROR("Header check failed\n");
*length_read = 0;
header->magic = 0;
io_close(backend_handle);
break;
}
io_close(backend_handle);
}
return result;
}
/* Close a partition */
static int stm32image_partition_close(io_entity_t *entity)
{
current_part = NULL;
return 0;
}
/* Register the stm32image driver with the IO abstraction */
int register_io_dev_stm32image(const io_dev_connector_t **dev_con)
{
int result;
assert(dev_con != NULL);
result = io_register_device(&stm32image_dev_info);
if (result == 0) {
*dev_con = &stm32image_dev_connector;
}
return result;
}