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ARM: OMAP2+: gpmc: fix gpmc_hwecc_bch_capable()

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This patch adds bch8 ecc software fallback which is mostly used by
omap3s because they lack hardware elm support.

Fixes: 0611c41934 (ARM: OMAP2+: gpmc:
update gpmc_hwecc_bch_capable() for new platforms and ECC schemes)
Cc: <stable@vger.kernel.org> # 3.15.x+
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Reviewed-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Christoph Fritz 2014-07-14 03:36:18 +02:00 committed by Tony Lindgren
parent 23d9cec07c
commit 33753cd2ba
1 changed files with 10 additions and 8 deletions
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18
arch/arm/mach-omap2/gpmc-nand.c
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@ -50,6 +50,16 @@ static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
soc_is_omap54xx() || soc_is_dra7xx()) soc_is_omap54xx() || soc_is_dra7xx())
return 1; return 1;
if (ecc_opt == OMAP_ECC_BCH4_CODE_HW_DETECTION_SW ||
ecc_opt == OMAP_ECC_BCH8_CODE_HW_DETECTION_SW) {
if (cpu_is_omap24xx())
return 0;
else if (cpu_is_omap3630() && (GET_OMAP_REVISION() == 0))
return 0;
else
return 1;
}
/* OMAP3xxx do not have ELM engine, so cannot support ECC schemes /* OMAP3xxx do not have ELM engine, so cannot support ECC schemes
* which require H/W based ECC error detection */ * which require H/W based ECC error detection */
if ((cpu_is_omap34xx() || cpu_is_omap3630()) && if ((cpu_is_omap34xx() || cpu_is_omap3630()) &&
@ -57,14 +67,6 @@ static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
(ecc_opt == OMAP_ECC_BCH8_CODE_HW))) (ecc_opt == OMAP_ECC_BCH8_CODE_HW)))
return 0; return 0;
/*
* For now, assume 4-bit mode is only supported on OMAP3630 ES1.x, x>=1
* and AM33xx derivates. Other chips may be added if confirmed to work.
*/
if ((ecc_opt == OMAP_ECC_BCH4_CODE_HW_DETECTION_SW) &&
(!cpu_is_omap3630() || (GET_OMAP_REVISION() == 0)))
return 0;
/* legacy platforms support only HAM1 (1-bit Hamming) ECC scheme */ /* legacy platforms support only HAM1 (1-bit Hamming) ECC scheme */
if (ecc_opt == OMAP_ECC_HAM1_CODE_HW) if (ecc_opt == OMAP_ECC_HAM1_CODE_HW)
return 1; return 1;