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

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Message-ID: <ed3dd4b6-658f-07d2-a055-4c38f2ec9db0@ti.com>
Date:   Wed, 8 Mar 2023 14:53:57 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Roger Quadros <rogerq@...nel.org>,
        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: [EXTERNAL] Re: [PATCH v3 4/6] soc: ti: pruss: Add helper
 functions to set GPI mode, MII_RT_event and XFR

Hi Roger,

On 08/03/23 14:04, Roger Quadros wrote:
> 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?
> 
Sure we can check for invalid gpi mode.

Does the below code snippet looks good to you?

	if(mode < PRUSS_GPI_MODE_DIRECT || mode > PRUSS_GPI_MODE_MII)
		return -EINVAL;

>> +	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

-- 
Thanks and Regards,
Danish.