linux-kernel - Re: [PATCH V2 1/2] nvmem: imx: scu: support hole region check

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Message-ID: <48bc66d5-684a-cfdb-67dd-722dbf80edbf@linaro.org>
Date:   Tue, 1 Oct 2019 11:14:50 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Cc:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Aisheng Dong <aisheng.dong@....com>
Subject: Re: [PATCH V2 1/2] nvmem: imx: scu: support hole region check



On 27/09/2019 03:23, Peng Fan wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Introduce HOLE/ECC_REGION flag and in_hole helper to ease the check
> of hole region. The ECC_REGION is also introduced here which is
> preparing for programming support. ECC_REGION could only be programmed
> once, so need take care.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> 
> V2:
>   Rebased on latest linux-next
> 
>   drivers/nvmem/imx-ocotp-scu.c | 47 ++++++++++++++++++++++++++++++++++++++-----
>   1 file changed, 42 insertions(+), 5 deletions(-)

thanks, applied both.

--srini
> 
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index 61a17f943f47..030e27ba4dfb 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -19,9 +19,20 @@ enum ocotp_devtype {
>   	IMX8QM,
>   };
>   
> +#define ECC_REGION	BIT(0)
> +#define HOLE_REGION	BIT(1)
> +
> +struct ocotp_region {
> +	u32 start;
> +	u32 end;
> +	u32 flag;
> +};
> +
>   struct ocotp_devtype_data {
>   	int devtype;
>   	int nregs;
> +	u32 num_region;
> +	struct ocotp_region region[];
>   };
>   
>   struct ocotp_priv {
> @@ -38,13 +49,41 @@ struct imx_sc_msg_misc_fuse_read {
>   static struct ocotp_devtype_data imx8qxp_data = {
>   	.devtype = IMX8QXP,
>   	.nregs = 800,
> +	.num_region = 3,
> +	.region = {
> +		{0x10, 0x10f, ECC_REGION},
> +		{0x110, 0x21F, HOLE_REGION},
> +		{0x220, 0x31F, ECC_REGION},
> +	},
>   };
>   
>   static struct ocotp_devtype_data imx8qm_data = {
>   	.devtype = IMX8QM,
>   	.nregs = 800,
> +	.num_region = 2,
> +	.region = {
> +		{0x10, 0x10f, ECC_REGION},
> +		{0x1a0, 0x1ff, ECC_REGION},
> +	},
>   };
>   
> +static bool in_hole(void *context, u32 index)
> +{
> +	struct ocotp_priv *priv = context;
> +	const struct ocotp_devtype_data *data = priv->data;
> +	int i;
> +
> +	for (i = 0; i < data->num_region; i++) {
> +		if (data->region[i].flag & HOLE_REGION) {
> +			if ((index >= data->region[i].start) &&
> +			    (index <= data->region[i].end))
> +				return true;
> +		}
> +	}
> +
> +	return false;
> +}
> +
>   static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word,
>   				     u32 *val)
>   {
> @@ -91,11 +130,9 @@ static int imx_scu_ocotp_read(void *context, unsigned int offset,
>   	buf = p;
>   
>   	for (i = index; i < (index + count); i++) {
> -		if (priv->data->devtype == IMX8QXP) {
> -			if ((i > 271) && (i < 544)) {
> -				*buf++ = 0;
> -				continue;
> -			}
> +		if (in_hole(context, i)) {
> +			*buf++ = 0;
> +			continue;
>   		}
>   
>   		ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
>