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Subject: Re: [PATCH V3 2/4] mailbox: imx: restructure code to make easy for
 new MU
To:     peng.fan@nxp.com, shawnguo@kernel.org, s.hauer@pengutronix.de,
        jassisinghbrar@gmail.com, robh+dt@kernel.org
Cc:     aisheng.dong@nxp.com, Anson.Huang@nxp.com,
        linux-kernel@vger.kernel.org, linux-imx@nxp.com,
        kernel@pengutronix.de, leonard.crestez@nxp.com, festevam@gmail.com,
        linux-arm-kernel@lists.infradead.org
References: <1582692043-683-1-git-send-email-peng.fan@nxp.com>
 <1582692043-683-3-git-send-email-peng.fan@nxp.com>
From:   Oleksij Rempel <o.rempel@pengutronix.de>
Message-ID: <67ebbf3d-d6aa-17fc-5110-eead63c8232d@pengutronix.de>
Date:   Mon, 2 Mar 2020 10:10:16 +0100
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Hi Peng,

On 26.02.20 05:40, peng.fan@nxp.com wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Add imx_mu_generic_tx for data send and imx_mu_generic_rx for interrupt
> data receive.
> Add 'type' for MU type.
> 
> With these, it will be a bit easy to introduce i.MX8/8X SCU type
> MU dedicated to communicate with SCU.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> 
> V3:
>   New patch, restructure code.
> 
>   drivers/mailbox/imx-mailbox.c | 100 ++++++++++++++++++++++++++++--------------
>   1 file changed, 67 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index 2cdcdc5f1119..901a3431fdb5 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -36,7 +36,17 @@ enum imx_mu_chan_type {
>   	IMX_MU_TYPE_RXDB,	/* Rx doorbell */
>   };
>   
> +enum imx_mu_type {
> +	IMX_MU_TYPE_GENERIC,
> +};

I assume this enum is not needed, see my next email
> +struct imx_mu_priv;
> +struct imx_mu_con_priv;
> +
>   struct imx_mu_dcfg {
> +	enum imx_mu_type type;
> +	int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
> +	int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
>   	u32	xTR[4];		/* Transmit Registers */
>   	u32	xRR[4];		/* Receive Registers */
>   	u32	xSR;		/* Status Register */
> @@ -67,20 +77,6 @@ struct imx_mu_priv {
>   	bool			side_b;
>   };
>   
> -static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
> -	.xTR	= {0x0, 0x4, 0x8, 0xc},
> -	.xRR	= {0x10, 0x14, 0x18, 0x1c},
> -	.xSR	= 0x20,
> -	.xCR	= 0x24,
> -};
> -
> -static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
> -	.xTR	= {0x20, 0x24, 0x28, 0x2c},
> -	.xRR	= {0x40, 0x44, 0x48, 0x4c},
> -	.xSR	= 0x60,
> -	.xCR	= 0x64,
> -};

Please, do not move it.

>   static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
>   {
>   	return container_of(mbox, struct imx_mu_priv, mbox);
> @@ -111,6 +107,40 @@ static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, u32 set, u32 clr)
>   	return val;
>   }
>   
> +static int imx_mu_generic_tx(struct imx_mu_priv *priv,
> +			     struct imx_mu_con_priv *cp,
> +			     void *data)
> +{
> +	u32 *arg = data;
> +
> +	switch (cp->type) {
> +	case IMX_MU_TYPE_TX:
> +		imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
> +		imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
> +		break;
> +	case IMX_MU_TYPE_TXDB:
> +		imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
> +		tasklet_schedule(&cp->txdb_tasklet);
> +		break;
> +	default:
> +		dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int imx_mu_generic_rx(struct imx_mu_priv *priv,
> +			     struct imx_mu_con_priv *cp)
> +{
> +	u32 dat;
> +
> +	dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
> +	mbox_chan_received_data(cp->chan, (void *)&dat);
> +
> +	return 0;
> +}
> +
>   static void imx_mu_txdb_tasklet(unsigned long data)
>   {
>   	struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
> @@ -123,7 +153,7 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
>   	struct mbox_chan *chan = p;
>   	struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
>   	struct imx_mu_con_priv *cp = chan->con_priv;
> -	u32 val, ctrl, dat;
> +	u32 val, ctrl;
>   
>   	ctrl = imx_mu_read(priv, priv->dcfg->xCR);
>   	val = imx_mu_read(priv, priv->dcfg->xSR);
> @@ -152,8 +182,7 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
>   		imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
>   		mbox_chan_txdone(chan, 0);
>   	} else if (val == IMX_MU_xSR_RFn(cp->idx)) {
> -		dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
> -		mbox_chan_received_data(chan, (void *)&dat);
> +		priv->dcfg->rx(priv, cp);
>   	} else if (val == IMX_MU_xSR_GIPn(cp->idx)) {
>   		imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), priv->dcfg->xSR);
>   		mbox_chan_received_data(chan, NULL);
> @@ -169,23 +198,8 @@ static int imx_mu_send_data(struct mbox_chan *chan, void *data)
>   {
>   	struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
>   	struct imx_mu_con_priv *cp = chan->con_priv;
> -	u32 *arg = data;
> -
> -	switch (cp->type) {
> -	case IMX_MU_TYPE_TX:
> -		imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
> -		imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
> -		break;
> -	case IMX_MU_TYPE_TXDB:
> -		imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
> -		tasklet_schedule(&cp->txdb_tasklet);
> -		break;
> -	default:
> -		dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
> -		return -EINVAL;
> -	}
>   
> -	return 0;
> +	return priv->dcfg->tx(priv, cp, data);
>   }
>   
>   static int imx_mu_startup(struct mbox_chan *chan)
> @@ -367,6 +381,26 @@ static int imx_mu_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> +static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
> +	.type	= IMX_MU_TYPE_GENERIC,
> +	.tx	= imx_mu_generic_tx,
> +	.rx	= imx_mu_generic_rx,
> +	.xTR	= {0x0, 0x4, 0x8, 0xc},
> +	.xRR	= {0x10, 0x14, 0x18, 0x1c},
> +	.xSR	= 0x20,
> +	.xCR	= 0x24,
> +};
> +
> +static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
> +	.type	= IMX_MU_TYPE_GENERIC,
> +	.tx	= imx_mu_generic_tx,
> +	.rx	= imx_mu_generic_rx,
> +	.xTR	= {0x20, 0x24, 0x28, 0x2c},
> +	.xRR	= {0x40, 0x44, 0x48, 0x4c},
> +	.xSR	= 0x60,
> +	.xCR	= 0x64,
> +};
> +
>   static const struct of_device_id imx_mu_dt_ids[] = {
>   	{ .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
>   	{ .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
> 

Kind regards,
Oleksij Rempel

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