linux-kernel - Re: [PATCH V3 5/6] remoteproc: imx

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Message-ID: <20220628180257.GD1942439@p14s>
Date:   Tue, 28 Jun 2022 12:02:57 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     bjorn.andersson@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 5/6] remoteproc: imx_rproc: support i.MX8QM

On Tue, May 17, 2022 at 02:49:36PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Most logic are same as i.MX8QXP, but i.MX8QM has two general purpose
> M4 cores, the two cores runs independently and they has different resource
> id, different start address from SCFW view.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 41 +++++++++++++++++++++++++++++++---
>  1 file changed, 38 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 49cce9dd55c7..8326193c13d6 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2017 Pengutronix, Oleksij Rempel <kernel@...gutronix.de>
>   */
>  
> +#include <dt-bindings/firmware/imx/rsrc.h>
>  #include <linux/arm-smccc.h>
>  #include <linux/clk.h>
>  #include <linux/err.h>
> @@ -75,10 +76,13 @@ struct imx_rproc_mem {
>  	size_t size;
>  };
>  
> -/* att flags */
> +/* att flags: lower 16 bits specifying core, higher 16 bits for flags  */
>  /* M4 own area. Can be mapped at probe */
> -#define ATT_OWN		BIT(1)
> -#define ATT_IOMEM	BIT(2)
> +#define ATT_OWN         BIT(31)
> +#define ATT_IOMEM       BIT(30)
> +
> +#define ATT_CORE_MASK   0xffff
> +#define ATT_CORE(I)     BIT((I))
>  
>  struct imx_rproc {
>  	struct device			*dev;
> @@ -99,6 +103,7 @@ struct imx_rproc {
>  	u32				rsrc_id;	/* resource id */
>  	u32				entry;		/* cpu start address */
>  	int                             num_pd;
> +	u32				core_index;
>  	struct device                   **pd_dev;
>  	struct device_link              **pd_dev_link;
>  };
> @@ -129,6 +134,19 @@ static const struct imx_rproc_att imx_rproc_att_imx93[] = {
>  	{ 0xD0000000, 0xa0000000, 0x10000000, 0 },
>  };
>  
> +static const struct imx_rproc_att imx_rproc_att_imx8qm[] = {
> +	/* dev addr , sys addr  , size      , flags */
> +	{ 0x08000000, 0x08000000, 0x10000000, 0},
> +	/* TCML */
> +	{ 0x1FFE0000, 0x34FE0000, 0x00020000, ATT_OWN | ATT_IOMEM | ATT_CORE(0)},
> +	{ 0x1FFE0000, 0x38FE0000, 0x00020000, ATT_OWN | ATT_IOMEM | ATT_CORE(1)},
> +	/* TCMU */
> +	{ 0x20000000, 0x35000000, 0x00020000, ATT_OWN | ATT_IOMEM | ATT_CORE(0)},
> +	{ 0x20000000, 0x39000000, 0x00020000, ATT_OWN | ATT_IOMEM | ATT_CORE(1)},
> +	/* DDR (Data) */
> +	{ 0x80000000, 0x80000000, 0x60000000, 0 },
> +};
> +
>  static const struct imx_rproc_att imx_rproc_att_imx8qxp[] = {
>  	{ 0x08000000, 0x08000000, 0x10000000, 0 },
>  	/* TCML/U */
> @@ -279,6 +297,12 @@ static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mq = {
>  	.method		= IMX_RPROC_MMIO,
>  };
>  
> +static const struct imx_rproc_dcfg imx_rproc_cfg_imx8qm = {
> +	.att            = imx_rproc_att_imx8qm,
> +	.att_size       = ARRAY_SIZE(imx_rproc_att_imx8qm),
> +	.method         = IMX_RPROC_SCU_API,
> +};
> +
>  static const struct imx_rproc_dcfg imx_rproc_cfg_imx8qxp = {
>  	.att		= imx_rproc_att_imx8qxp,
>  	.att_size	= ARRAY_SIZE(imx_rproc_att_imx8qxp),
> @@ -395,6 +419,11 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64 da,
>  	for (i = 0; i < dcfg->att_size; i++) {
>  		const struct imx_rproc_att *att = &dcfg->att[i];
>  
> +		if (att->flags & ATT_CORE_MASK) {
> +			if (!((BIT(priv->core_index)) & (att->flags & ATT_CORE_MASK)))
> +				continue;
> +		}

This is very cryptic - I just spent 20 minutes looking at it and I'm still not
sure I got the full meaning.  Please add enough comments to make things obvious
on first read.

I am done reviewing this patchset.

Thanks,
Mathieu


> +
>  		if (da >= att->da && da + len < att->da + att->size) {
>  			unsigned int offset = da - att->da;
>  
> @@ -815,6 +844,11 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  			return ret;
>  		}
>  
> +		if (priv->rsrc_id == IMX_SC_R_M4_1_PID0)
> +			priv->core_index = 1;
> +		else
> +			priv->core_index = 0;
> +
>  		/*
>  		 * If Mcore resource is not owned by Acore partition, It is kicked by ROM,
>  		 * and Linux could only do IPC with Mcore and nothing else.
> @@ -1008,6 +1042,7 @@ static const struct of_device_id imx_rproc_of_match[] = {
>  	{ .compatible = "fsl,imx8mn-cm7", .data = &imx_rproc_cfg_imx8mn },
>  	{ .compatible = "fsl,imx8mp-cm7", .data = &imx_rproc_cfg_imx8mn },
>  	{ .compatible = "fsl,imx8qxp-cm4", .data = &imx_rproc_cfg_imx8qxp },
> +	{ .compatible = "fsl,imx8qm-cm4", .data = &imx_rproc_cfg_imx8qm },
>  	{ .compatible = "fsl,imx8ulp-cm33", .data = &imx_rproc_cfg_imx8ulp },
>  	{ .compatible = "fsl,imx93-cm33", .data = &imx_rproc_cfg_imx93 },
>  	{},
> -- 
> 2.25.1
>