linux-kernel - Re: [PATCH v2 4/9] mtd: rawnand: jz4780: Add support for the JZ4740

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Date:   Sun, 3 Feb 2019 08:31:51 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Mathieu Malaterre <malat@...ian.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/9] mtd: rawnand: jz4780: Add support for the JZ4740

On Sat,  2 Feb 2019 20:19:21 -0300
Paul Cercueil <paul@...pouillou.net> wrote:

> Add support for probing the jz4780-nand driver on the JZ4740 SoC from
> Ingenic.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> 
> Changes:
> 
> v2: - Add support for the JZ4740 and not the JZ4725B: they behave the
>       same, and JZ4740 is fully upstream while JZ4725B is not. The
>       JZ4725B devicetree will then simply use the "ingenic,jz4740-nand"
>       compatible string.
>     - Fix the number of bytes for the ECC when the ECC strength is 4.
>       This is needed for the JZ4740, which uses Reed-Solomon instead of
>       BCH.
> 
>  drivers/mtd/nand/raw/ingenic/jz4780_nand.c | 48 +++++++++++++++++-----

If we're going to make the driver compatible with jz4740 and jz4725b
maybe we should rename the source files jz47xx_{nand,bch}.{c,h}.

>  1 file changed, 37 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/ingenic/jz4780_nand.c b/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> index 7f55358b860f..c0855fef7735 100644
> --- a/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> +++ b/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <linux/of_device.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
> @@ -26,13 +27,15 @@
>  
>  #define DRV_NAME	"jz4780-nand"
>  
> -#define OFFSET_DATA	0x00000000
> -#define OFFSET_CMD	0x00400000
> -#define OFFSET_ADDR	0x00800000
> -
>  /* Command delay when there is no R/B pin. */
>  #define RB_DELAY_US	100
>  
> +struct jz_soc_info {
> +	unsigned long data_offset;
> +	unsigned long addr_offset;
> +	unsigned long cmd_offset;
> +};
> +
>  struct jz4780_nand_cs {
>  	unsigned int bank;
>  	void __iomem *base;
> @@ -40,6 +43,7 @@ struct jz4780_nand_cs {
>  
>  struct jz4780_nand_controller {
>  	struct device *dev;
> +	const struct jz_soc_info *soc_info;
>  	struct jz4780_bch *bch;
>  	struct nand_controller controller;
>  	unsigned int num_banks;
> @@ -101,9 +105,9 @@ static void jz4780_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
>  		return;
>  
>  	if (ctrl & NAND_ALE)
> -		writeb(cmd, cs->base + OFFSET_ADDR);
> +		writeb(cmd, cs->base + nfc->soc_info->addr_offset);
>  	else if (ctrl & NAND_CLE)
> -		writeb(cmd, cs->base + OFFSET_CMD);
> +		writeb(cmd, cs->base + nfc->soc_info->cmd_offset);
>  }
>  
>  static int jz4780_nand_dev_ready(struct nand_chip *chip)
> @@ -161,8 +165,13 @@ static int jz4780_nand_attach_chip(struct nand_chip *chip)
>  	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
>  	int eccbytes;
>  
> -	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
> -				(chip->ecc.strength / 8);
> +	if (chip->ecc.strength == 4) {
> +		/* JZ4740 uses 9 bytes of ECC to correct maximum 4 errors */
> +		chip->ecc.bytes = 9;
> +	} else {
> +		chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
> +				  (chip->ecc.strength / 8);
> +	}
>  
>  	switch (chip->ecc.mode) {
>  	case NAND_ECC_HW:
> @@ -272,8 +281,8 @@ static int jz4780_nand_init_chip(struct platform_device *pdev,
>  		return -ENOMEM;
>  	mtd->dev.parent = dev;
>  
> -	chip->legacy.IO_ADDR_R = cs->base + OFFSET_DATA;
> -	chip->legacy.IO_ADDR_W = cs->base + OFFSET_DATA;
> +	chip->legacy.IO_ADDR_R = cs->base + nfc->soc_info->data_offset;
> +	chip->legacy.IO_ADDR_W = cs->base + nfc->soc_info->data_offset;
>  	chip->legacy.chip_delay = RB_DELAY_US;
>  	chip->options = NAND_NO_SUBPAGE_WRITE;
>  	chip->legacy.select_chip = jz4780_nand_select_chip;
> @@ -353,6 +362,10 @@ static int jz4780_nand_probe(struct platform_device *pdev)
>  	if (!nfc)
>  		return -ENOMEM;
>  
> +	nfc->soc_info = device_get_match_data(dev);
> +	if (!nfc->soc_info)
> +		return -EINVAL;
> +
>  	/*
>  	 * Check for BCH HW before we call nand_scan_ident, to prevent us from
>  	 * having to call it again if the BCH driver returns -EPROBE_DEFER.
> @@ -390,8 +403,21 @@ static int jz4780_nand_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct jz_soc_info jz4740_soc_info = {
> +	.data_offset = 0x00000000,
> +	.cmd_offset  = 0x00008000,
> +	.addr_offset = 0x00010000,
> +};
> +
> +static const struct jz_soc_info jz4780_soc_info = {
> +	.data_offset = 0x00000000,
> +	.cmd_offset  = 0x00400000,
> +	.addr_offset = 0x00800000,
> +};
> +
>  static const struct of_device_id jz4780_nand_dt_match[] = {
> -	{ .compatible = "ingenic,jz4780-nand" },
> +	{ .compatible = "ingenic,jz4740-nand", .data = &jz4740_soc_info },
> +	{ .compatible = "ingenic,jz4780-nand",  .data = &jz4780_soc_info  },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, jz4780_nand_dt_match);