IFI_CANFD_TXSTCMD
writel(IFI_CANFD_TXSTCMD_RESET, priv->base + IFI_CANFD_TXSTCMD);
writel(0, priv->base + IFI_CANFD_TXSTCMD);
txst = readl(priv->base + IFI_CANFD_TXSTCMD);
writel(IFI_CANFD_TXSTCMD_ADD_MSG, priv->base + IFI_CANFD_TXSTCMD);