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feat(mtd): add platform function to allow using external buffer

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The scratch buffer could be large. The new function allows
platform to defined its own external buffer or use the default
one.

Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Change-Id: Ib7ab8ff19fa0a9cb06e364f058b91af58c3c471a
This commit is contained in:
Lionel Debieve 2021-04-13 13:38:02 +02:00 • committed by Yann Gautier
parent 351f9cd889
commit f29c0702d2
2 changed files with 25 additions and 6 deletions
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25
drivers/mtd/nand/core.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019-2021, STMicroelectronics - All Rights Reserved
* Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -8,19 +8,30 @@
#include <errno.h>
#include <stddef.h>
#include <platform_def.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)
{
@ -34,6 +45,12 @@ int nand_read(unsigned int offset, uintptr_t buffer, size_t length,
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);
@ -41,7 +58,7 @@ int nand_read(unsigned int offset, uintptr_t buffer, size_t length,
*length_read = 0UL;
if (((start_offset != 0U) || (length % nand_dev.page_size) != 0U) &&
(sizeof(scratch_buff) < nand_dev.page_size)) {
(scratch_buff_size < nand_dev.page_size)) {
return -EINVAL;
}

4
include/drivers/nand.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019-2021, STMicroelectronics - All Rights Reserved
* Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -33,6 +33,8 @@ struct nand_device {
uintptr_t buffer);
};
void plat_get_scratch_buffer(void **buffer_addr, size_t *buf_size);
/*
* Read bytes from NAND device
*