netdev - Re: [PATCH V4 1/3] can: flexcan: initialize all flexcan memory for ECC function

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Date:   Tue, 29 Sep 2020 07:48:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     mkl@...gutronix.de, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH V4 1/3] can: flexcan: initialize all flexcan memory for
 ECC function

On Wed, 30 Sep 2020 04:30:39 +0800 Joakim Zhang wrote:
> @@ -1292,6 +1307,35 @@ static void flexcan_set_bittiming(struct net_device *dev)
>  		return flexcan_set_bittiming_ctrl(dev);
>  }
>  
> +static void flexcan_init_ram(struct net_device *dev)
> +{
> +	struct flexcan_priv *priv = netdev_priv(dev);
> +	struct flexcan_regs __iomem *regs = priv->regs;
> +	u32 reg_ctrl2;
> +
> +	/* 11.8.3.13 Detection and correction of memory errors:
> +	 * CTRL2[WRMFRZ] grants write access to all memory positions that
> +	 * require initialization, ranging from 0x080 to 0xADF and
> +	 * from 0xF28 to 0xFFF when the CAN FD feature is enabled.
> +	 * The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers need to
> +	 * be initialized as well. MCR[RFEN] must not be set during memory
> +	 * initialization.
> +	 */
> +	reg_ctrl2 = priv->read(&regs->ctrl2);
> +	reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
> +	priv->write(reg_ctrl2, &regs->ctrl2);
> +
> +	memset_io(&regs->mb[0][0], 0,
> +		  (u8 *)&regs->rx_smb1[3] - &regs->mb[0][0] + 0x4);
> +
> +	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
> +		memset_io(&regs->tx_smb_fd[0], 0,
> +			  (u8 *)&regs->rx_smb1_fd[17] - (u8 *)&regs->tx_smb_fd[0] + 0x4);
> +
> +	reg_ctrl2 &= ~FLEXCAN_CTRL2_WRMFRZ;
> +	priv->write(reg_ctrl2, &regs->ctrl2);
> +}
> +
>  /* flexcan_chip_start
>   *
>   * this functions is entered with clocks enabled

drivers/net/can/flexcan.c:1329:20: warning: cast removes address space '__iomem' of expression
drivers/net/can/flexcan.c:1329:43: error: subtraction of different types can't work (different address spaces)