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mtd: nand: sunxi: introduce sunxi_nfc_hw_ecc_read/write_chunk()

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The logic behind normal and syndrome ECC handling is pretty much the same,
the only difference is the ECC bytes placement.
Create two functions to read/write ECC chunks. Those functions will later
be used by the sunxi_nfc_hw_ecc_read/write_page() and
sunxi_nfc_hw_syndrome_ecc_read/write_page() functions.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Boris BREZILLON 2015-09-30 23:45:24 +02:00 committed by Brian Norris
parent c9118ecebe
commit 913821bdd2
1 changed files with 92 additions and 0 deletions
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92
drivers/mtd/nand/sunxi_nand.c
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@ -567,6 +567,98 @@ static void sunxi_nfc_hw_ecc_disable(struct mtd_info *mtd)
nfc->regs + NFC_REG_ECC_CTL);
}
static int sunxi_nfc_hw_ecc_read_chunk(struct mtd_info *mtd,
u8 *data, int data_off,
u8 *oob, int oob_off,
int *cur_off,
unsigned int *max_bitflips)
{
struct nand_chip *nand = mtd->priv;
struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
struct nand_ecc_ctrl *ecc = &nand->ecc;
u32 status;
int ret;
if (*cur_off != data_off)
nand->cmdfunc(mtd, NAND_CMD_RNDOUT, data_off, -1);
sunxi_nfc_read_buf(mtd, data, ecc->size);
if (data_off + ecc->bytes != oob_off)
nand->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_off, -1);
ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
if (ret)
return ret;
writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_ECC_OP,
nfc->regs + NFC_REG_CMD);
ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
if (ret)
return ret;
status = readl(nfc->regs + NFC_REG_ECC_ST);
ret = NFC_ECC_ERR_CNT(0, readl(nfc->regs + NFC_REG_ECC_ERR_CNT(0)));
memcpy_fromio(data, nfc->regs + NFC_RAM0_BASE, ecc->size);
nand->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_off, -1);
sunxi_nfc_read_buf(mtd, oob, ecc->bytes + 4);
if (status & NFC_ECC_ERR(0))
ret = -EIO;
if (ret < 0) {
mtd->ecc_stats.failed++;
} else {
mtd->ecc_stats.corrected += ret;
*max_bitflips = max_t(unsigned int, *max_bitflips, ret);
}
*cur_off = oob_off + ecc->bytes + 4;
return 0;
}
static int sunxi_nfc_hw_ecc_write_chunk(struct mtd_info *mtd,
const u8 *data, int data_off,
const u8 *oob, int oob_off,
int *cur_off)
{
struct nand_chip *nand = mtd->priv;
struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
struct nand_ecc_ctrl *ecc = &nand->ecc;
int ret;
if (data_off != *cur_off)
nand->cmdfunc(mtd, NAND_CMD_RNDIN, data_off, -1);
sunxi_nfc_write_buf(mtd, data, ecc->size);
/* Fill OOB data in */
writel(NFC_BUF_TO_USER_DATA(oob), nfc->regs + NFC_REG_USER_DATA(0));
if (data_off + ecc->bytes != oob_off)
nand->cmdfunc(mtd, NAND_CMD_RNDIN, oob_off, -1);
ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
if (ret)
return ret;
writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD |
NFC_ACCESS_DIR | NFC_ECC_OP,
nfc->regs + NFC_REG_CMD);
ret = sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0);
if (ret)
return ret;
*cur_off = oob_off + ecc->bytes + 4;
return 0;
}
static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)