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mtd: nand: omap: ecc.calculate: merge omap3_calculate_ecc_bch4 in omap_calculate_ecc_bch

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merges omap3_calculate_ecc_bch4() into omap_calculate_ecc_bch() so that
common callback can be used for both OMAP_ECC_BCH4_CODE_HW and
OMAP_ECC_BCH4_CODE_HW_DETECTION_SW ecc-schemes

+---------------------+-------------------------------------------------------+
|ecc-scheme           | nand_chip->calculate() after this patch               |
+---------------------+-------------------------------------------------------+
|HAM1_ECC             | omap_calculate_ecc()                                  |
+---------------------+-------------------------------------------------------+
|BCH4_HW_DETECTION_SW | omap3_calculate_ecc_bch4() -> omap_calculate_ecc_bch()|
|BCH4_HW              | omap_calculate_ecc_bch()                              |
|BCH8_HW_DETECTION_SW | omap3_calculate_ecc_bch8()                            |
|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 15:53:13 +05:30 committed by Brian Norris
parent f5dc06fb71
commit 2c9f2365d1
1 changed files with 10 additions and 41 deletions
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51
drivers/mtd/nand/omap2.c
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@ -1121,47 +1121,9 @@ static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode)
writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
}
#endif
static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f};
#ifdef CONFIG_MTD_NAND_ECC_BCH
/**
* omap3_calculate_ecc_bch4 - Generate 7 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_bch4(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;
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]);
/*
* Add constant polynomial to remainder, in order to get an ecc
* sequence of 0xFFs for a buffer filled with 0xFFs; and
* left-justify the resulting polynomial.
*/
*ecc_code++ = 0x28 ^ ((val2 >> 12) & 0xFF);
*ecc_code++ = 0x13 ^ ((val2 >> 4) & 0xFF);
*ecc_code++ = 0xcc ^ (((val2 & 0xF) << 4)|((val1 >> 28) & 0xF));
*ecc_code++ = 0x39 ^ ((val1 >> 20) & 0xFF);
*ecc_code++ = 0x96 ^ ((val1 >> 12) & 0xFF);
*ecc_code++ = 0xac ^ ((val1 >> 4) & 0xFF);
*ecc_code++ = 0x7f ^ ((val1 & 0xF) << 4);
}
return 0;
}
/**
* omap3_calculate_ecc_bch8 - Generate 13 bytes of ECC bytes
* @mtd: MTD device structure
@ -1209,7 +1171,6 @@ static int omap3_calculate_ecc_bch8(struct mtd_info *mtd, const u_char *dat,
}
#endif /* CONFIG_MTD_NAND_ECC_BCH */
#ifdef CONFIG_MTD_NAND_OMAP_BCH
/**
* omap_calculate_ecc_bch - Generate bytes of ECC bytes
* @mtd: MTD device structure
@ -1252,6 +1213,7 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
*ecc_code++ = ((bch_val1 >> 8) & 0xFF);
*ecc_code++ = (bch_val1 & 0xFF);
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH4_CODE_HW:
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
@ -1270,6 +1232,12 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
/* ECC scheme specific syndrome customizations */
switch (info->ecc_opt) {
case OMAP_ECC_BCH4_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] ^= bch4_polynomial[i];
break;
case OMAP_ECC_BCH4_CODE_HW:
/* Set 8th ECC byte as 0x0 for ROM compatibility */
ecc_calc[eccbytes - 1] = 0x0;
@ -1327,6 +1295,7 @@ static int erased_sector_bitflips(u_char *data, u_char *oob,
return flip_bits;
}
#ifdef CONFIG_MTD_NAND_OMAP_BCH
/**
* omap_elm_correct_data - corrects page data area in case error reported
* @mtd: MTD device structure
@ -1835,7 +1804,7 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->ecc.strength = 4;
nand_chip->ecc.hwctl = omap3_enable_hwecc_bch;
nand_chip->ecc.correct = nand_bch_correct_data;
nand_chip->ecc.calculate = omap3_calculate_ecc_bch4;
nand_chip->ecc.calculate = omap_calculate_ecc_bch;
/* define ECC layout */
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /