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

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Message-ID: <AM0PR04MB448106FD48328C2261260F7E88BA0@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Fri, 6 Sep 2019 06:57:03 +0000
From:   Peng Fan <peng.fan@....com>
To:     Peng Fan <peng.fan@....com>,
        "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
        "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 1/2] nvmem: imx: scu: support hole region check

> Subject: [PATCH 1/2] nvmem: imx: scu: support hole region check

Ping..

Thanks,
Peng.

> 
> 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>
> ---
>  drivers/nvmem/imx-ocotp-scu.c | 42
> +++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 37 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index d9dc482ecb2f..2f339d7432e6 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -18,9 +18,20 @@ enum ocotp_devtype {
>  	IMX8QXP,
>  };
> 
> +#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 {
> @@ -37,8 +48,31 @@ 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 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)
>  {
> @@ -85,11 +119,9 @@ 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);
> --
> 2.16.4