linux-kernel - Re: [PATCH 4/8] dmaengine: fsl-edma: add eDMAv3 registers to edma

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Message-ID: <Z2BSuA/3V655k2bX@lizhi-Precision-Tower-5810>
Date: Mon, 16 Dec 2024 11:18:00 -0500
From: Frank Li <Frank.li@....com>
To: Larisa Grigore <larisa.grigore@....nxp.com>
Cc: dmaengine@...r.kernel.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org, s32@....com,
	Christophe Lizzi <clizzi@...hat.com>,
	Alberto Ruiz <aruizrui@...hat.com>,
	Enric Balletbo <eballetb@...hat.com>
Subject: Re: [PATCH 4/8] dmaengine: fsl-edma: add eDMAv3 registers to
 edma_regs

On Mon, Dec 16, 2024 at 09:58:14AM +0200, Larisa Grigore wrote:
> Add edma3_regs to match eDMAv3 new register layout for manage page (MP).
> Introduce helper function fsl_edma3_setup_regs() to initialize the
> edma_regs for eDMAv3, which pave the road to support S32 chips.
>
> Signed-off-by: Larisa Grigore <larisa.grigore@....nxp.com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/dma/fsl-edma-common.c | 15 +++++++++++++++
>  drivers/dma/fsl-edma-common.h | 11 ++++++++++-
>  drivers/dma/fsl-edma-main.c   |  8 +++++---
>  3 files changed, 30 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
> index b132a88dfdec..62d51b269e54 100644
> --- a/drivers/dma/fsl-edma-common.c
> +++ b/drivers/dma/fsl-edma-common.c
> @@ -44,6 +44,11 @@
>  #define EDMA64_ERRH		0x28
>  #define EDMA64_ERRL		0x2c
>
> +#define EDMA_V3_MP_CSR		0x00
> +#define EDMA_V3_MP_ES		0x04
> +#define EDMA_V3_MP_INT		0x08
> +#define EDMA_V3_MP_HRS		0x0C
> +
>  void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan)
>  {
>  	spin_lock(&fsl_chan->vchan.lock);
> @@ -904,4 +909,14 @@ void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
>  	}
>  }
>
> +void fsl_edma3_setup_regs(struct fsl_edma_engine *edma)
> +{
> +	struct edma_regs *regs = &edma->regs;
> +
> +	regs->cr = edma->membase + EDMA_V3_MP_CSR;
> +	regs->es = edma->membase + EDMA_V3_MP_ES;
> +	regs->v3.is = edma->membase + EDMA_V3_MP_INT;
> +	regs->v3.hrs = edma->membase + EDMA_V3_MP_HRS;
> +}
> +
>  MODULE_LICENSE("GPL v2");
> diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
> index f1362daaa347..52901623d6fc 100644
> --- a/drivers/dma/fsl-edma-common.h
> +++ b/drivers/dma/fsl-edma-common.h
> @@ -139,10 +139,18 @@ struct edma2_regs {
>  	void __iomem *errl;
>  };
>
> +struct edma3_regs {
> +	void __iomem *is;
> +	void __iomem *hrs;
> +};
> +
>  struct edma_regs {
>  	void __iomem *cr;
>  	void __iomem *es;
> -	struct edma2_regs v2;
> +	union {
> +		struct edma2_regs v2;
> +		struct edma3_regs v3;
> +	};
>  };
>
>  struct fsl_edma_sw_tcd {
> @@ -491,5 +499,6 @@ int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
>  void fsl_edma_free_chan_resources(struct dma_chan *chan);
>  void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
>  void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
> +void fsl_edma3_setup_regs(struct fsl_edma_engine *edma);
>
>  #endif /* _FSL_EDMA_COMMON_H_ */
> diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
> index 0b89c31bf38c..cc1787698b56 100644
> --- a/drivers/dma/fsl-edma-main.c
> +++ b/drivers/dma/fsl-edma-main.c
> @@ -495,10 +495,12 @@ static int fsl_edma_probe(struct platform_device *pdev)
>  	if (IS_ERR(fsl_edma->membase))
>  		return PTR_ERR(fsl_edma->membase);
>
> -	if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) {
> +	if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
>  		fsl_edma_setup_regs(fsl_edma);
> -		regs = &fsl_edma->regs;
> -	}
> +	else
> +		fsl_edma3_setup_regs(fsl_edma);
> +
> +	regs = &fsl_edma->regs;
>
>  	if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
>  		fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
> --
> 2.47.0
>