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mtd: nand: qcom: erased codeword detection configuration 

The NAND controller returns ECC failure during read of completely
erased codeword. The NAND controller has hardware functionality
to detect erased codeword in case of BCH ECC algorithm. The
NAND_ERASED_CW_DETECT_CFG register controls the erased
codeword/page detection controller. This register should be reset
before every page read by setting and clearing bit 0 of
NAND_ERASED_CW_DETECT_CFG.

Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Abhishek Sahu 2017-08-17 17:37:44 +05:30 committed by Boris Brezillon
parent 91af95c143
commit a86b9c4f57
1 changed files with 21 additions and 0 deletions
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21
drivers/mtd/nand/qcom_nandc.c
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@ -203,6 +203,11 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_##reg, \
#define NAND_BAM_NWD BIT(1)
/* Finish writing in the current BAM sgl and start writing in another BAM sgl */
#define NAND_BAM_NEXT_SGL BIT(2)
/*
* Erased codeword status is being used two times in single transfer so this
* flag will determine the current value of erased codeword status register
*/
#define NAND_ERASED_CW_SET BIT(4)
/*
* This data type corresponds to the BAM transaction which will be used for all
@ -281,6 +286,8 @@ struct nandc_regs {
__le32 read_location2;
__le32 read_location3;
__le32 erased_cw_detect_cfg_clr;
__le32 erased_cw_detect_cfg_set;
};
/*
@ -810,6 +817,13 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
if (first == NAND_FLASH_CMD)
flow_control = true;
if (first == NAND_ERASED_CW_DETECT_CFG) {
if (flags & NAND_ERASED_CW_SET)
vaddr = &regs->erased_cw_detect_cfg_set;
else
vaddr = &regs->erased_cw_detect_cfg_clr;
}
if (first == NAND_EXEC_CMD)
flags |= NAND_BAM_NWD;
@ -864,6 +878,9 @@ static void config_nand_page_read(struct qcom_nand_controller *nandc)
write_reg_dma(nandc, NAND_ADDR0, 2, 0);
write_reg_dma(nandc, NAND_DEV0_CFG0, 3, 0);
write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1, 0);
write_reg_dma(nandc, NAND_ERASED_CW_DETECT_CFG, 1, 0);
write_reg_dma(nandc, NAND_ERASED_CW_DETECT_CFG, 1,
NAND_ERASED_CW_SET | NAND_BAM_NEXT_SGL);
}
/*
@ -2264,6 +2281,10 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
host->clrflashstatus = FS_READY_BSY_N;
host->clrreadstatus = 0xc0;
nandc->regs->erased_cw_detect_cfg_clr =
cpu_to_le32(CLR_ERASED_PAGE_DET);
nandc->regs->erased_cw_detect_cfg_set =
cpu_to_le32(SET_ERASED_PAGE_DET);
dev_dbg(nandc->dev,
"cfg0 %x cfg1 %x ecc_buf_cfg %x ecc_bch cfg %x cw_size %d cw_data %d strength %d parity_bytes %d steps %d\n",