linux-kernel - Re: [EXTERNAL] 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: <f061fc6c-0b17-3e7f-ccae-9fb980d1e546@kernel.org>
Date:   Wed, 8 Mar 2023 13:39:33 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Md Danish Anwar <a0501179@...com>,
        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: [EXTERNAL] Re: [PATCH v3 4/6] soc: ti: pruss: Add
 helper functions to set GPI mode, MII_RT_event and XFR



On 08/03/2023 13:29, Md Danish Anwar wrote:
> 
> 
> On 08/03/23 16:45, Roger Quadros wrote:
>>
>>
>> On 08/03/2023 11:23, Md Danish Anwar wrote:
>>> 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)
>>
>> How about?
>> 	if (mode < 0 || mode > PRUSS_GPI_MODE_MAX)
>>
> 
> Sure that would be better. But we will have to introduce PRUSS_GPI_MODE_MAX in
> the enum definition.
> 
> Also the if() should check for mode >= PRUSS_GPI_MODE_MAX so the if check will
> become,
> 
> 	if (mode < 0 || mode >= PRUSS_GPI_MODE_MAX)
> 		return -EINVAL;
> 
> enum definition,
> 
> enum pruss_gpi_mode {
> 	PRUSS_GPI_MODE_DIRECT = 0,
> 	PRUSS_GPI_MODE_PARALLEL,
> 	PRUSS_GPI_MODE_28BIT_SHIFT,
> 	PRUSS_GPI_MODE_MII,
> 	PRUSS_GPI_MODE_MAX,
> };
> 

Yes. Looks good.

>>> 		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
>