linux-kernel - Re: [PATCH v3 4/6] soc: ti: pruss: Add helper functions to set GPI mode, MII_RT

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Message-ID: <2f039534-dd21-7361-0fcd-b91da1636a3a@kernel.org>
Date:   Wed, 8 Mar 2023 10:34:12 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     MD Danish Anwar <danishanwar@...com>,
        "Andrew F. Davis" <afd@...com>, Suman Anna <s-anna@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <t-kristo@...com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Nishanth Menon <nm@...com>
Cc:     linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, srk@...com, devicetree@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 4/6] soc: ti: pruss: Add helper functions to set GPI
 mode, MII_RT_event and XFR

Hi Danish,

On 06/03/2023 13:09, MD Danish Anwar wrote:
> From: Suman Anna <s-anna@...com>
> 
> The PRUSS CFG module is represented as a syscon node and is currently
> managed by the PRUSS platform driver. Add easy accessor functions to set
> GPI mode, MII_RT event enable/disable and XFR (XIN XOUT) enable/disable
> to enable the PRUSS Ethernet usecase. These functions reuse the generic
> pruss_cfg_update() API function.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
> Signed-off-by: Puranjay Mohan <p-mohan@...com>
> ---
>  include/linux/remoteproc/pruss.h | 55 ++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h
> index d41bec448f06..7952f250301a 100644
> --- a/include/linux/remoteproc/pruss.h
> +++ b/include/linux/remoteproc/pruss.h
> @@ -240,4 +240,59 @@ static inline bool is_pru_rproc(struct device *dev)
>  	return true;
>  }
>  
> +/**
> + * pruss_cfg_gpimode() - set the GPI mode of the PRU
> + * @pruss: the pruss instance handle
> + * @pru_id: id of the PRU core within the PRUSS
> + * @mode: GPI mode to set
> + *
> + * Sets the GPI mode for a given PRU by programming the
> + * corresponding PRUSS_CFG_GPCFGx register
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +static inline int pruss_cfg_gpimode(struct pruss *pruss,
> +				    enum pruss_pru_id pru_id,
> +				    enum pruss_gpi_mode mode)
> +{
> +	if (pru_id < 0 || pru_id >= PRUSS_NUM_PRUS)
> +		return -EINVAL;
> +

Should we check for invalid gpi mode and error out if so?

> +	return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
> +				PRUSS_GPCFG_PRU_GPI_MODE_MASK,
> +				mode << PRUSS_GPCFG_PRU_GPI_MODE_SHIFT);
> +}
> +
> +/**
> + * pruss_cfg_miirt_enable() - Enable/disable MII RT Events
> + * @pruss: the pruss instance
> + * @enable: enable/disable
> + *
> + * Enable/disable the MII RT Events for the PRUSS.
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +static inline int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable)
> +{
> +	u32 set = enable ? PRUSS_MII_RT_EVENT_EN : 0;
> +
> +	return pruss_cfg_update(pruss, PRUSS_CFG_MII_RT,
> +				PRUSS_MII_RT_EVENT_EN, set);
> +}
> +
> +/**
> + * pruss_cfg_xfr_enable() - Enable/disable XIN XOUT shift functionality
> + * @pruss: the pruss instance
> + * @enable: enable/disable
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +static inline int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable)
> +{
> +	u32 set = enable ? PRUSS_SPP_XFER_SHIFT_EN : 0;
> +
> +	return pruss_cfg_update(pruss, PRUSS_CFG_SPP,
> +				PRUSS_SPP_XFER_SHIFT_EN, set);
> +}
> +
>  #endif /* __LINUX_PRUSS_H */

cheers,
-roger