diff options
| author | Andreas Bießmann | 2013-04-04 23:52:50 +0000 |
|---|---|---|
| committer | Tom Rini | 2013-04-08 11:29:05 -0400 |
| commit | da634ae3567cc2df435f8617dbc95db2d079bf11 (patch) | |
| tree | a249938868b5615ac13d3b35e10dfade2673f983 /drivers | |
| parent | c0ed9179b817dfc147b553d513e72a49f3b932e2 (diff) | |
omap_gpmc: change nandecc command
With uppcoming BCH support on OMAP devices we need to decide between differnt
algorithms when switching the ECC engine. Currently we support 1-bit hammign
and 8-bit BCH on HW backend.
In order to switch between differnet ECC algorithms we need to change the
interface of omap_nand_switch_ecc() also.
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Cc: Tom Rini <trini@ti.com>
Cc: Thomas Weber <thomas.weber.linux@googlemail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/omap_gpmc.c | 57 |
1 files changed, 31 insertions, 26 deletions
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index c7d49999030..3468c7805e3 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -604,13 +604,14 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip, #ifndef CONFIG_SPL_BUILD /* - * omap_nand_switch_ecc - switch the ECC operation b/w h/w ecc and s/w ecc. - * The default is to come up on s/w ecc - * - * @hardware - 1 -switch to h/w ecc, 0 - s/w ecc + * omap_nand_switch_ecc - switch the ECC operation between different engines + * (h/w and s/w) and different algorithms (hamming and BCHx) * + * @hardware - true if one of the HW engines should be used + * @eccstrength - the number of bits that could be corrected + * (1 - hamming, 4 - BCH4, 8 - BCH8, 16 - BCH16) */ -void omap_nand_switch_ecc(int32_t hardware) +void omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength) { struct nand_chip *nand; struct mtd_info *mtd; @@ -628,6 +629,7 @@ void omap_nand_switch_ecc(int32_t hardware) nand->options |= NAND_OWN_BUFFERS; /* Reset ecc interface */ + nand->ecc.mode = NAND_ECC_NONE; nand->ecc.read_page = NULL; nand->ecc.write_page = NULL; nand->ecc.read_oob = NULL; @@ -637,28 +639,31 @@ void omap_nand_switch_ecc(int32_t hardware) nand->ecc.calculate = NULL; /* Setup the ecc configurations again */ - if (hardware == 1) { - nand->ecc.mode = NAND_ECC_HW; - nand->ecc.layout = &hw_nand_oob; - nand->ecc.size = 512; - nand->ecc.bytes = 3; - nand->ecc.hwctl = omap_enable_hwecc; - nand->ecc.correct = omap_correct_data; - nand->ecc.calculate = omap_calculate_ecc; - omap_hwecc_init(nand); - printf("HW ECC selected\n"); + if (hardware) { + if (eccstrength == 1) { + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.layout = &hw_nand_oob; + nand->ecc.size = 512; + nand->ecc.bytes = 3; + nand->ecc.hwctl = omap_enable_hwecc; + nand->ecc.correct = omap_correct_data; + nand->ecc.calculate = omap_calculate_ecc; + omap_hwecc_init(nand); + printf("1-bit hamming HW ECC selected\n"); + } #ifdef CONFIG_AM33XX - } else if (hardware == 2) { - nand->ecc.mode = NAND_ECC_HW; - nand->ecc.layout = &hw_bch8_nand_oob; - nand->ecc.size = 512; - nand->ecc.bytes = 14; - nand->ecc.read_page = omap_read_page_bch; - nand->ecc.hwctl = omap_enable_ecc_bch; - nand->ecc.correct = omap_correct_data_bch; - nand->ecc.calculate = omap_calculate_ecc_bch; - omap_hwecc_init_bch(nand, NAND_ECC_READ); - printf("HW BCH8 selected\n"); + else if (eccstrength == 8) { + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.layout = &hw_bch8_nand_oob; + nand->ecc.size = 512; + nand->ecc.bytes = 14; + nand->ecc.read_page = omap_read_page_bch; + nand->ecc.hwctl = omap_enable_ecc_bch; + nand->ecc.correct = omap_correct_data_bch; + nand->ecc.calculate = omap_calculate_ecc_bch; + omap_hwecc_init_bch(nand, NAND_ECC_READ); + printf("8-bit BCH HW ECC selected\n"); + } #endif } else { nand->ecc.mode = NAND_ECC_SOFT; |