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Date:   Tue, 13 Apr 2021 11:52:35 -0600
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     peng.fan@oss.nxp.com
Cc:     ohad@wizery.com, bjorn.andersson@linaro.org,
        o.rempel@pengutronix.de, robh+dt@kernel.org,
        devicetree@vger.kernel.org, shawnguo@kernel.org,
        s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com,
        linux-remoteproc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH V3 8/8] remoteproc: imx_rproc: support i.MX8MN/P
Message-ID: <20210413175235.GF750651@xps15>
References: <1617846898-13662-1-git-send-email-peng.fan@oss.nxp.com>
 <1617846898-13662-9-git-send-email-peng.fan@oss.nxp.com>
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On Thu, Apr 08, 2021 at 09:54:58AM +0800, peng.fan@oss.nxp.com wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Add i.MX8MN/P remote processor(Cortex-M7) support, we are using ARM
> SMCCC to start/stop M core, not using regmap interface.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/remoteproc/imx_rproc.c | 89 +++++++++++++++++++++++++++++++---
>  1 file changed, 82 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index b911a7539897..9351626f09c0 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2017 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
>   */
>  
> +#include <linux/arm-smccc.h>
>  #include <linux/clk.h>
>  #include <linux/err.h>
>  #include <linux/interrupt.h>
> @@ -50,6 +51,11 @@
>  
>  #define IMX_RPROC_MEM_MAX		32
>  
> +#define IMX_SIP_RPROC			0xC2000005
> +#define IMX_SIP_RPROC_START		0x00
> +#define IMX_SIP_RPROC_STARTED		0x01
> +#define IMX_SIP_RPROC_STOP		0x02
> +
>  /**
>   * struct imx_rproc_mem - slim internal memory structure
>   * @cpu_addr: MPU virtual address of the memory region
> @@ -119,6 +125,36 @@ struct imx_rproc {
>  	enum imx_rproc_mode		mode;
>  };
>  
> +static const struct imx_rproc_att imx_rproc_att_imx8mn[] = {
> +	/* dev addr , sys addr  , size	    , flags */
> +	/* ITCM   */
> +	{ 0x00000000, 0x007E0000, 0x00020000, ATT_OWN },
> +	/* OCRAM_S */
> +	{ 0x00180000, 0x00180000, 0x00009000, 0 },
> +	/* OCRAM */
> +	{ 0x00900000, 0x00900000, 0x00020000, 0 },
> +	/* OCRAM */
> +	{ 0x00920000, 0x00920000, 0x00020000, 0 },
> +	/* OCRAM */
> +	{ 0x00940000, 0x00940000, 0x00050000, 0 },
> +	/* QSPI Code - alias */
> +	{ 0x08000000, 0x08000000, 0x08000000, 0 },
> +	/* DDR (Code) - alias */
> +	{ 0x10000000, 0x40000000, 0x0FFE0000, 0 },
> +	/* DTCM */
> +	{ 0x20000000, 0x00800000, 0x00020000, ATT_OWN },
> +	/* OCRAM_S - alias */
> +	{ 0x20180000, 0x00180000, 0x00008000, ATT_OWN },
> +	/* OCRAM */
> +	{ 0x20200000, 0x00900000, 0x00020000, ATT_OWN },
> +	/* OCRAM */
> +	{ 0x20220000, 0x00920000, 0x00020000, ATT_OWN },
> +	/* OCRAM */
> +	{ 0x20240000, 0x00940000, 0x00040000, ATT_OWN },
> +	/* DDR (Data) */
> +	{ 0x40000000, 0x40000000, 0x80000000, 0 },
> +};
> +
>  static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
>  	/* dev addr , sys addr  , size	    , flags */
>  	/* TCML - alias */
> @@ -205,6 +241,12 @@ static const struct imx_rproc_att imx_rproc_att_imx6sx[] = {
>  	{ 0x80000000, 0x80000000, 0x60000000, 0 },
>  };
>  
> +static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mn = {
> +	.att		= imx_rproc_att_imx8mn,
> +	.att_size	= ARRAY_SIZE(imx_rproc_att_imx8mn),
> +	.method		= IMX_RPROC_SMC,
> +};
> +
>  static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mq = {
>  	.src_reg	= IMX7D_SRC_SCR,
>  	.src_mask	= IMX7D_M4_RST_MASK,
> @@ -246,12 +288,24 @@ static int imx_rproc_start(struct rproc *rproc)
>  	struct imx_rproc *priv = rproc->priv;
>  	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
>  	struct device *dev = priv->dev;
> +	struct arm_smccc_res res;
>  	int ret;
>  
> -	ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> -				 dcfg->src_mask, dcfg->src_start);
> +	switch (dcfg->method) {
> +	case IMX_RPROC_MMIO:
> +		ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
> +					 dcfg->src_start);
> +		break;
> +	case IMX_RPROC_SMC:
> +		arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_START, 0, 0, 0, 0, 0, 0, &res);
> +		ret = res.a0;
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
>  	if (ret)
> -		dev_err(dev, "Failed to enable M4!\n");
> +		dev_err(dev, "Failed to enable remote cores!\n");
>  
>  	return ret;
>  }
> @@ -261,12 +315,26 @@ static int imx_rproc_stop(struct rproc *rproc)
>  	struct imx_rproc *priv = rproc->priv;
>  	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
>  	struct device *dev = priv->dev;
> +	struct arm_smccc_res res;
>  	int ret;
>  
> -	ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> -				 dcfg->src_mask, dcfg->src_stop);
> +	switch (dcfg->method) {
> +	case IMX_RPROC_MMIO:
> +		ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
> +					 dcfg->src_stop);
> +		break;
> +	case IMX_RPROC_SMC:
> +		arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_STOP, 0, 0, 0, 0, 0, 0, &res);
> +		ret = res.a0;
> +		if (res.a1)
> +			dev_info(dev, "Not in wfi, force stopped\n");
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
>  	if (ret)
> -		dev_err(dev, "Failed to stop M4!\n");
> +		dev_err(dev, "Failed to stop remote cores\n");
>  
>  	return ret;
>  }
> @@ -600,6 +668,7 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  {
>  	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
>  	struct device *dev = priv->dev;
> +	struct arm_smccc_res res;
>  	int ret;
>  	u32 val;
>  
> @@ -616,8 +685,12 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  			priv->mode = IMX_RPROC_EARLY_BOOT;
>  	}
>  
> -	if (dcfg->method == IMX_RPROC_NONE)
> +	if (dcfg->method == IMX_RPROC_NONE) {
>  		priv->mode = IMX_RPROC_EARLY_BOOT;
> +	} else if (dcfg->method == IMX_RPROC_SMC) {
> +		arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_STARTED, 0, 0, 0, 0, 0, 0, &res);
> +		priv->mode = res.a0 ? IMX_RPROC_EARLY_BOOT : IMX_RPROC_NORMAL;
> +	}

When all patches have been applied this function is really hard to read.  I
suggest using a switch() statement like you did in imx_rproc_start() and
imx_rproc_stop().

Thanks,
Mathieu

>  
>  	if (priv->mode == IMX_RPROC_EARLY_BOOT)
>  		priv->rproc->state = RPROC_DETACHED;
> @@ -747,6 +820,8 @@ static const struct of_device_id imx_rproc_of_match[] = {
>  	{ .compatible = "fsl,imx6sx-cm4", .data = &imx_rproc_cfg_imx6sx },
>  	{ .compatible = "fsl,imx8mq-cm4", .data = &imx_rproc_cfg_imx8mq },
>  	{ .compatible = "fsl,imx8mm-cm4", .data = &imx_rproc_cfg_imx8mq },
> +	{ .compatible = "fsl,imx8mn-cm7", .data = &imx_rproc_cfg_imx8mn },
> +	{ .compatible = "fsl,imx8mp-cm7", .data = &imx_rproc_cfg_imx8mn },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx_rproc_of_match);
> -- 
> 2.30.0
>