linux-kernel - Re: [PATCH] mtd: rawnand: qcom: Add helper to configure location register

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Message-ID: <20210223172055.54eba1ad@xps13>
Date:   Tue, 23 Feb 2021 17:20:55 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Md Sadre Alam <mdalam@...eaurora.org>
Cc:     mani@...nel.org, boris.brezillon@...labora.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH] mtd: rawnand: qcom: Add helper to configure location
 register

Hello,

Md Sadre Alam <mdalam@...eaurora.org> wrote on Mon, 22 Feb 2021
20:35:43 +0530:

> This change will add helper nandc_set_read_loc() to configure
> location register value. QPIC V2 on wards there is separate
> location register to read the last code word. This helper
> will use to configure location register for last code word
> as well.
> 

"
Create a nandc_set_read_loc() helper to abstract the configuration of
the location register.

QPIC v2 onwards features a separate location register for the last
codeword, so introducing this extra helper will simplify the addition of
QPIC v2 support.
"

> Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
> ---
>  drivers/mtd/nand/raw/qcom_nandc.c | 38 ++++++++++++++++++++++++++------------
>  1 file changed, 26 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> index bfefb4e..82d083ad 100644
> --- a/drivers/mtd/nand/raw/qcom_nandc.c
> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> @@ -181,8 +181,8 @@
>  #define	ECC_BCH_4BIT	BIT(2)
>  #define	ECC_BCH_8BIT	BIT(3)
>  
> -#define nandc_set_read_loc(nandc, reg, cw_offset, read_size, is_last_read_loc)	\
> -nandc_set_reg(nandc, NAND_READ_LOCATION_##reg,			\
> +#define nandc_set_read_loc_first(nandc, reg, cw_offset, read_size, is_last_read_loc)	\

Please do the s/nandc/chip/ renaming in patch 1.

> +nandc_set_reg(nandc, reg,			\
>  	      ((cw_offset) << READ_LOCATION_OFFSET) |		\
>  	      ((read_size) << READ_LOCATION_SIZE) |			\
>  	      ((is_last_read_loc) << READ_LOCATION_LAST))
> @@ -667,6 +667,20 @@ static bool qcom_nandc_is_last_cw(struct nand_ecc_ctrl *ecc, int cw)
>  	return cw == (ecc->steps - 1);
>  }
>  
> +/* helper to configure location register values */
> +static void nandc_set_read_loc(struct nand_chip *chip, int cw, int reg,
> +			       int cw_offset, int read_size, int is_last_read_loc)
> +{
> +	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
> +
> +	int reg_base = NAND_READ_LOCATION_0;
> +
> +	reg_base += reg * 4;
> +
> +	return nandc_set_read_loc_first(nandc, reg_base, cw_offset,
> +			read_size, is_last_read_loc);
> +}
> +
>  /* helper to configure address register values */
>  static void set_address(struct qcom_nand_host *host, u16 column, int page)
>  {
> @@ -726,7 +740,7 @@ static void update_rw_regs(struct qcom_nand_host *host, int num_cw, bool read)
>  	nandc_set_reg(nandc, NAND_EXEC_CMD, 1);
>  
>  	if (read)
> -		nandc_set_read_loc(nandc, 0, 0, host->use_ecc ?
> +		nandc_set_read_loc(chip, 0, 0, 0, host->use_ecc ?
>  				   host->cw_data : host->cw_size, 1);
>  }
>  
> @@ -1221,7 +1235,7 @@ static int nandc_param(struct qcom_nand_host *host)
>  		nandc_set_reg(nandc, NAND_DEV_CMD_VLD_RESTORE, nandc->vld);
>  	}
>  
> -	nandc_set_read_loc(nandc, 0, 0, 512, 1);
> +	nandc_set_read_loc(chip, 0, 0, 0, 512, 1);
>  
>  	if (!nandc->props->qpic_v2) {
>  		write_reg_dma(nandc, NAND_DEV_CMD_VLD, 1, 0);
> @@ -1649,16 +1663,16 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, struct nand_chip *chip,
>  	}
>  
>  	if (nandc->props->is_bam) {
> -		nandc_set_read_loc(nandc, 0, read_loc, data_size1, 0);
> +		nandc_set_read_loc(chip, cw, 0, read_loc, data_size1, 0);
>  		read_loc += data_size1;
>  
> -		nandc_set_read_loc(nandc, 1, read_loc, oob_size1, 0);
> +		nandc_set_read_loc(chip, cw, 1, read_loc, oob_size1, 0);
>  		read_loc += oob_size1;
>  
> -		nandc_set_read_loc(nandc, 2, read_loc, data_size2, 0);
> +		nandc_set_read_loc(chip, cw, 2, read_loc, data_size2, 0);
>  		read_loc += data_size2;
>  
> -		nandc_set_read_loc(nandc, 3, read_loc, oob_size2, 1);
> +		nandc_set_read_loc(chip, cw, 3, read_loc, oob_size2, 1);
>  	}
>  
>  	config_nand_cw_read(chip, false);
> @@ -1889,13 +1903,13 @@ static int read_page_ecc(struct qcom_nand_host *host, u8 *data_buf,
>  
>  		if (nandc->props->is_bam) {
>  			if (data_buf && oob_buf) {
> -				nandc_set_read_loc(nandc, 0, 0, data_size, 0);
> -				nandc_set_read_loc(nandc, 1, data_size,
> +				nandc_set_read_loc(chip, i, 0, 0, data_size, 0);
> +				nandc_set_read_loc(chip, i, 1, data_size,
>  						   oob_size, 1);
>  			} else if (data_buf) {
> -				nandc_set_read_loc(nandc, 0, 0, data_size, 1);
> +				nandc_set_read_loc(chip, i, 0, 0, data_size, 1);
>  			} else {
> -				nandc_set_read_loc(nandc, 0, data_size,
> +				nandc_set_read_loc(chip, i, 0, data_size,
>  						   oob_size, 1);
>  			}
>  		}

Thanks,
Miquèl