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/*
* Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <common/debug.h>
#include <drivers/delay_timer.h>
#include <drivers/nand.h>
#include <lib/utils.h>
#include <platform_def.h>
/*
* Define a single nand_device used by specific NAND frameworks.
*/
static struct nand_device nand_dev;
#pragma weak plat_get_scratch_buffer
void plat_get_scratch_buffer(void **buffer_addr, size_t *buf_size)
{
static uint8_t scratch_buff[PLATFORM_MTD_MAX_PAGE_SIZE];
assert(buffer_addr != NULL);
assert(buf_size != NULL);
*buffer_addr = (void *)scratch_buff;
*buf_size = sizeof(scratch_buff);
}
int nand_read(unsigned int offset, uintptr_t buffer, size_t length,
size_t *length_read)
{
unsigned int block = offset / nand_dev.block_size;
unsigned int end_block = (offset + length - 1U) / nand_dev.block_size;
unsigned int page_start =
(offset % nand_dev.block_size) / nand_dev.page_size;
unsigned int nb_pages = nand_dev.block_size / nand_dev.page_size;
unsigned int start_offset = offset % nand_dev.page_size;
unsigned int page;
unsigned int bytes_read;
int is_bad;
int ret;
uint8_t *scratch_buff;
size_t scratch_buff_size;
plat_get_scratch_buffer((void **)&scratch_buff, &scratch_buff_size);
assert(scratch_buff != NULL);
VERBOSE("Block %u - %u, page_start %u, nb %u, length %zu, offset %u\n",
block, end_block, page_start, nb_pages, length, offset);
*length_read = 0UL;
if (((start_offset != 0U) || (length % nand_dev.page_size) != 0U) &&
(scratch_buff_size < nand_dev.page_size)) {
return -EINVAL;
}
while (block <= end_block) {
is_bad = nand_dev.mtd_block_is_bad(block);
if (is_bad < 0) {
return is_bad;
}
if (is_bad == 1) {
/* Skip the block */
uint32_t max_block =
nand_dev.size / nand_dev.block_size;
block++;
end_block++;
if ((block < max_block) && (end_block < max_block)) {
continue;
}
return -EIO;
}
for (page = page_start; page < nb_pages; page++) {
if ((start_offset != 0U) ||
(length < nand_dev.page_size)) {
ret = nand_dev.mtd_read_page(
&nand_dev,
(block * nb_pages) + page,
(uintptr_t)scratch_buff);
if (ret != 0) {
return ret;
}
bytes_read = MIN((size_t)(nand_dev.page_size -
start_offset),
length);
memcpy((uint8_t *)buffer,
scratch_buff + start_offset,
bytes_read);
start_offset = 0U;
} else {
ret = nand_dev.mtd_read_page(&nand_dev,
(block * nb_pages) + page,
buffer);
if (ret != 0) {
return ret;
}
bytes_read = nand_dev.page_size;
}
length -= bytes_read;
buffer += bytes_read;
*length_read += bytes_read;
if (length == 0U) {
break;
}
}
page_start = 0U;
block++;
}
return 0;
}
int nand_seek_bb(uintptr_t base, unsigned int offset, size_t *extra_offset)
{
unsigned int block;
unsigned int offset_block;
unsigned int max_block;
int is_bad;
size_t count_bb = 0U;
block = base / nand_dev.block_size;
if (offset != 0U) {
offset_block = (base + offset - 1U) / nand_dev.block_size;
} else {
offset_block = block;
}
max_block = nand_dev.size / nand_dev.block_size;
while (block <= offset_block) {
if (offset_block >= max_block) {
return -EIO;
}
is_bad = nand_dev.mtd_block_is_bad(block);
if (is_bad < 0) {
return is_bad;
}
if (is_bad == 1) {
count_bb++;
offset_block++;
}
block++;
}
*extra_offset = count_bb * nand_dev.block_size;
return 0;
}
struct nand_device *get_nand_device(void)
{
return &nand_dev;
}
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