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mtd: nand: omap: ecc.calculate: merge omap3_calculate_ecc_bch8 in omap_calculate_ecc_bch 

merge omap3_calculate_ecc_bch8() into omap_calculate_ecc_bch() so that
common callback can be used for both OMAP_ECC_BCH8_CODE_HW and
OMAP_ECC_BCH8_CODE_HW_DETECTION_SW
+---------------------+-------------------------------------------------------+
|ecc-scheme           | nand_chip->calculate() after this patch               |
+---------------------+-------------------------------------------------------+
|HAM1_ECC             | omap_calculate_ecc()                                  |
+---------------------+-------------------------------------------------------+
|BCH4_HW_DETECTION_SW | omap_calculate_ecc_bch()                              |
|BCH4_HW              | omap_calculate_ecc_bch()                              |
|BCH8_HW_DETECTION_SW | omap3_calculate_ecc_bch8() -> omap_calculate_ecc_bch()|
|BCH8_HW              | omap_calculate_ecc_bch()                              |
+---------------------+-------------------------------------------------------+

Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Pekon Gupta 2014-02-26 15:53:14 +05:30 коммит произвёл Brian Norris
Родитель 2c9f2365d1
Коммит 7bcd1dca1d
1 изменённых файлов: 10 добавлений и 49 удалений
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59
drivers/mtd/nand/omap2.c
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@ -1122,54 +1122,8 @@ static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode)
}
#endif
static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f};
#ifdef CONFIG_MTD_NAND_ECC_BCH
/**
* omap3_calculate_ecc_bch8 - Generate 13 bytes of ECC bytes
* @mtd: MTD device structure
* @dat: The pointer to data on which ecc is computed
* @ecc_code: The ecc_code buffer
*/
static int omap3_calculate_ecc_bch8(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
unsigned long nsectors, val1, val2, val3, val4;
int i;
nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1;
for (i = 0; i < nsectors; i++) {
/* Read hw-computed remainder */
val1 = readl(info->reg.gpmc_bch_result0[i]);
val2 = readl(info->reg.gpmc_bch_result1[i]);
val3 = readl(info->reg.gpmc_bch_result2[i]);
val4 = readl(info->reg.gpmc_bch_result3[i]);
/*
* Add constant polynomial to remainder, in order to get an ecc
* sequence of 0xFFs for a buffer filled with 0xFFs.
*/
*ecc_code++ = 0xef ^ (val4 & 0xFF);
*ecc_code++ = 0x51 ^ ((val3 >> 24) & 0xFF);
*ecc_code++ = 0x2e ^ ((val3 >> 16) & 0xFF);
*ecc_code++ = 0x09 ^ ((val3 >> 8) & 0xFF);
*ecc_code++ = 0xed ^ (val3 & 0xFF);
*ecc_code++ = 0x93 ^ ((val2 >> 24) & 0xFF);
*ecc_code++ = 0x9a ^ ((val2 >> 16) & 0xFF);
*ecc_code++ = 0xc2 ^ ((val2 >> 8) & 0xFF);
*ecc_code++ = 0x97 ^ (val2 & 0xFF);
*ecc_code++ = 0x79 ^ ((val1 >> 24) & 0xFF);
*ecc_code++ = 0xe5 ^ ((val1 >> 16) & 0xFF);
*ecc_code++ = 0x24 ^ ((val1 >> 8) & 0xFF);
*ecc_code++ = 0xb5 ^ (val1 & 0xFF);
}
return 0;
}
#endif /* CONFIG_MTD_NAND_ECC_BCH */
static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2,
0x97, 0x79, 0xe5, 0x24, 0xb5};
/**
* omap_calculate_ecc_bch - Generate bytes of ECC bytes
@ -1194,6 +1148,7 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
for (i = 0; i < nsectors; i++) {
ecc_code = ecc_calc;
switch (info->ecc_opt) {
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH8_CODE_HW:
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
@ -1242,6 +1197,12 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
/* Set 8th ECC byte as 0x0 for ROM compatibility */
ecc_calc[eccbytes - 1] = 0x0;
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
/* Add constant polynomial to remainder, so that
* ECC of blank pages results in 0x0 on reading back */
for (i = 0; i < eccbytes; i++)
ecc_calc[i] ^= bch8_polynomial[i];
break;
case OMAP_ECC_BCH8_CODE_HW:
/* Set 14th ECC byte as 0x0 for ROM compatibility */
ecc_calc[eccbytes - 1] = 0x0;
@ -1879,7 +1840,7 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->ecc.strength = 8;
nand_chip->ecc.hwctl = omap3_enable_hwecc_bch;
nand_chip->ecc.correct = nand_bch_correct_data;
nand_chip->ecc.calculate = omap3_calculate_ecc_bch8;
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
/* define ECC layout */
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /