linux-kernel - RE: [PATCH v2 1/9] mtd:fsl-quadspi:use the property fields of SPI-NOR

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Message-ID: <DB5PR0401MB191200E18A336E0BE5318D1694240@DB5PR0401MB1912.eurprd04.prod.outlook.com>
Date:	Thu, 30 Jun 2016 01:54:14 +0000
From:	Yunhui Cui <yunhui.cui@....com>
To:	Yunhui Cui <B56489@...escale.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"han.xu@...escale.com" <han.xu@...escale.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, Yao Yuan <yao.yuan@....com>
Subject: RE: [PATCH v2 1/9] mtd:fsl-quadspi:use the property fields of SPI-NOR

Hi Brian and Han,
Could you please give me some comments about this patch set v2 ?

Thanks

> -----Original Message-----
> From: Yunhui Cui [mailto:B56489@...escale.com]
> Sent: Friday, April 22, 2016 2:40 PM
> To: dwmw2@...radead.org; computersforpeace@...il.com;
> han.xu@...escale.com
> Cc: linux-kernel@...r.kernel.org; linux-mtd@...ts.infradead.org; linux-
> arm-kernel@...ts.infradead.org; Yao Yuan; Yunhui Cui
> Subject: [PATCH v2 1/9] mtd:fsl-quadspi:use the property fields of SPI-
> NOR
> 
> We can get the read/write/erase opcode from the spi nor framework
> directly. This patch uses the information stored in the SPI-NOR to remove
> the hardcode in the fsl_qspi_init_lut().
> 
> Signed-off-by: Yunhui Cui <B56489@...escale.com>
> Signed-off-by: Yunhui Cui <yunhui.cui@....com>
> ---
>  drivers/mtd/spi-nor/fsl-quadspi.c | 40 ++++++++++++---------------------
> ------
>  1 file changed, 12 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-
> quadspi.c
> index 9ab2b51..517ffe2 100644
> --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> @@ -373,9 +373,13 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  	void __iomem *base = q->iobase;
>  	int rxfifo = q->devtype_data->rxfifo;
>  	u32 lut_base;
> -	u8 cmd, addrlen, dummy;
>  	int i;
> 
> +	struct spi_nor *nor = &q->nor[0];
> +	u8 addrlen = (nor->addr_width == 3) ? ADDR24BIT : ADDR32BIT;
> +	u8 read_op = nor->read_opcode;
> +	u8 read_dm = nor->read_dummy;
> +
>  	fsl_qspi_unlock_lut(q);
> 
>  	/* Clear all the LUT table */
> @@ -385,20 +389,10 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  	/* Quad Read */
>  	lut_base = SEQID_QUAD_READ * 4;
> 
> -	if (q->nor_size <= SZ_16M) {
> -		cmd = SPINOR_OP_READ_1_1_4;
> -		addrlen = ADDR24BIT;
> -		dummy = 8;
> -	} else {
> -		/* use the 4-byte address */
> -		cmd = SPINOR_OP_READ_1_1_4;
> -		addrlen = ADDR32BIT;
> -		dummy = 8;
> -	}
> -
> -	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
> -	qspi_writel(q, LUT0(DUMMY, PAD1, dummy) | LUT1(FSL_READ, PAD4,
> rxfifo),
> +	qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
> +		    LUT1(FSL_READ, PAD4, rxfifo),
>  			base + QUADSPI_LUT(lut_base + 1));
> 
>  	/* Write enable */
> @@ -409,16 +403,8 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  	/* Page Program */
>  	lut_base = SEQID_PP * 4;
> 
> -	if (q->nor_size <= SZ_16M) {
> -		cmd = SPINOR_OP_PP;
> -		addrlen = ADDR24BIT;
> -	} else {
> -		/* use the 4-byte address */
> -		cmd = SPINOR_OP_PP;
> -		addrlen = ADDR32BIT;
> -	}
> -
> -	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, nor->program_opcode) |
> +		    LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
>  	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 0),
>  			base + QUADSPI_LUT(lut_base + 1));
> @@ -432,10 +418,8 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  	/* Erase a sector */
>  	lut_base = SEQID_SE * 4;
> 
> -	cmd = q->nor[0].erase_opcode;
> -	addrlen = q->nor_size <= SZ_16M ? ADDR24BIT : ADDR32BIT;
> -
> -	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, nor->erase_opcode) |
> +		    LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
> 
>  	/* Erase the whole chip */
> --
> 2.1.0.27.g96db324