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tools: mxsboot: Calculate ECC strength dynamically

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Calculating the ECC strength dynamically to be aligned with the mxs NAND
driver and the Linux Kernel.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Reviewed-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Jörg Krause 2015-04-15 09:27:23 +02:00 committed by Scott Wood
parent 1fbdb70610
commit 6121560d77
1 changed files with 22 additions and 13 deletions
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35
tools/mxsboot.c
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@ -14,6 +14,10 @@
#include "compiler.h"
/* Taken from <linux/kernel.h> */
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
#define round_down(x, y) ((x) & ~__round_mask(x, y))
/*
* Default BCB layout.
*
@ -126,6 +130,11 @@ struct mx28_sd_config_block {
struct mx28_sd_drive_info drv_info[1];
};
static inline uint32_t mx28_nand_ecc_chunk_cnt(uint32_t page_data_size)
{
return page_data_size / MXS_NAND_CHUNK_DATA_CHUNK_SIZE;
}
static inline uint32_t mx28_nand_ecc_size_in_bits(uint32_t ecc_strength)
{
return ecc_strength * MXS_NAND_BITS_PER_ECC_LEVEL;
@ -134,21 +143,21 @@ static inline uint32_t mx28_nand_ecc_size_in_bits(uint32_t ecc_strength)
static inline uint32_t mx28_nand_get_ecc_strength(uint32_t page_data_size,
uint32_t page_oob_size)
{
if (page_data_size == 2048)
return 8;
int ecc_strength;
if (page_data_size == 4096) {
if (page_oob_size == 128)
return 8;
/*
* Determine the ECC layout with the formula:
* ECC bits per chunk = (total page spare data bits) /
* (bits per ECC level) / (chunks per page)
* where:
* total page spare data bits =
* (page oob size - meta data size) * (bits per byte)
*/
ecc_strength = ((page_oob_size - MXS_NAND_METADATA_SIZE) * 8)
/ (MXS_NAND_BITS_PER_ECC_LEVEL *
mx28_nand_ecc_chunk_cnt(page_data_size));
if (page_oob_size == 218)
return 16;
if (page_oob_size == 224)
return 16;
}
return 0;
return round_down(ecc_strength, 2);
}
static inline uint32_t mx28_nand_get_mark_offset(uint32_t page_data_size,