linux-kernel - Re: [EXTERNAL] Re: [EXTERNAL] Re: [PATCH v4 3/5] soc: ti: pruss: Add pruss_cfg

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Message-ID: <7c08d8be-06aa-1f70-8262-f7a4893f80e2@ti.com>
Date:   Thu, 16 Mar 2023 17:04:08 +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>,
        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 v4 3/5] soc: ti: pruss: Add
 pruss_cfg_read()/update() API

On 16/03/23 17:02, Roger Quadros wrote:
> 
> 
> On 16/03/2023 13:29, Md Danish Anwar wrote:
>> Roger,
>>
>> On 16/03/23 16:38, Md Danish Anwar wrote:
>>>
>>> On 15/03/23 17:37, Roger Quadros wrote:
>>>> Danish,
>>>>
>>>> On 13/03/2023 13:11, MD Danish Anwar wrote:
>>>>> From: Suman Anna <s-anna@...com>
>>>>>
>>>>> Add two new generic API pruss_cfg_read() and pruss_cfg_update() to
>>>>> the PRUSS platform driver to read and program respectively a register
>>>>> within the PRUSS CFG sub-module represented by a syscon driver.
>>>>>
>>>>> These APIs are internal to PRUSS driver. Various useful registers
>>>>> and macros for certain register bit-fields and their values have also
>>>>> been added.
>>>>>
>>>>> 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>
>>>>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>>>>> ---
>>>>>  drivers/soc/ti/pruss.c           | 39 ++++++++++++++
>>>>>  include/linux/remoteproc/pruss.h | 87 ++++++++++++++++++++++++++++++++
>>>>>  2 files changed, 126 insertions(+)
>>>>>
>>>>> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
>>>>> index c8053c0d735f..26d8129b515c 100644
>>>>> --- a/drivers/soc/ti/pruss.c
>>>>> +++ b/drivers/soc/ti/pruss.c
>>>>> @@ -164,6 +164,45 @@ int pruss_release_mem_region(struct pruss *pruss,
>>>>>  }
>>>>>  EXPORT_SYMBOL_GPL(pruss_release_mem_region);
>>>>>  
>>>>> +/**
>>>>> + * pruss_cfg_read() - read a PRUSS CFG sub-module register
>>>>> + * @pruss: the pruss instance handle
>>>>> + * @reg: register offset within the CFG sub-module
>>>>> + * @val: pointer to return the value in
>>>>> + *
>>>>> + * Reads a given register within the PRUSS CFG sub-module and
>>>>> + * returns it through the passed-in @val pointer
>>>>> + *
>>>>> + * Return: 0 on success, or an error code otherwise
>>>>> + */
>>>>> +static int pruss_cfg_read(struct pruss *pruss, unsigned int reg, unsigned int *val)
>>>>> +{
>>>>> +	if (IS_ERR_OR_NULL(pruss))
>>>>> +		return -EINVAL;
>>>>> +
>>>>> +	return regmap_read(pruss->cfg_regmap, reg, val);
>>>>> +}
>>>>> +
>>>>> +/**
>>>>> + * pruss_cfg_update() - configure a PRUSS CFG sub-module register
>>>>> + * @pruss: the pruss instance handle
>>>>> + * @reg: register offset within the CFG sub-module
>>>>> + * @mask: bit mask to use for programming the @val
>>>>> + * @val: value to write
>>>>> + *
>>>>> + * Programs a given register within the PRUSS CFG sub-module
>>>>> + *
>>>>> + * Return: 0 on success, or an error code otherwise
>>>>> + */
>>>>> +static int pruss_cfg_update(struct pruss *pruss, unsigned int reg,
>>>>> +			    unsigned int mask, unsigned int val)
>>>>> +{
>>>>> +	if (IS_ERR_OR_NULL(pruss))
>>>>> +		return -EINVAL;
>>>>> +
>>>>> +	return regmap_update_bits(pruss->cfg_regmap, reg, mask, val);
>>>>> +}
>>>>> +
>>>>>  static void pruss_of_free_clk_provider(void *data)
>>>>>  {
>>>>>  	struct device_node *clk_mux_np = data;
>>>>> diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h
>>>>> index 33f930e0a0ce..12ef10b9fe9a 100644
>>>>> --- a/include/linux/remoteproc/pruss.h
>>>>> +++ b/include/linux/remoteproc/pruss.h
>>>>> @@ -10,12 +10,99 @@
>>>>>  #ifndef __LINUX_PRUSS_H
>>>>>  #define __LINUX_PRUSS_H
>>>>>  
>>>>> +#include <linux/bits.h>
>>>>>  #include <linux/device.h>
>>>>>  #include <linux/err.h>
>>>>>  #include <linux/types.h>
>>>>>  
>>>>>  #define PRU_RPROC_DRVNAME "pru-rproc"
>>>>>  
>>>>> +/*
>>>>> + * PRU_ICSS_CFG registers
>>>>> + * SYSCFG, ISRP, ISP, IESP, IECP, SCRP applicable on AMxxxx devices only
>>>>> + */
>>>>> +#define PRUSS_CFG_REVID		0x00
>>>>> +#define PRUSS_CFG_SYSCFG	0x04
>>>>> +#define PRUSS_CFG_GPCFG(x)	(0x08 + (x) * 4)
>>>>> +#define PRUSS_CFG_CGR		0x10
>>>>> +#define PRUSS_CFG_ISRP		0x14
>>>>> +#define PRUSS_CFG_ISP		0x18
>>>>> +#define PRUSS_CFG_IESP		0x1C
>>>>> +#define PRUSS_CFG_IECP		0x20
>>>>> +#define PRUSS_CFG_SCRP		0x24
>>>>> +#define PRUSS_CFG_PMAO		0x28
>>>>> +#define PRUSS_CFG_MII_RT	0x2C
>>>>> +#define PRUSS_CFG_IEPCLK	0x30
>>>>> +#define PRUSS_CFG_SPP		0x34
>>>>> +#define PRUSS_CFG_PIN_MX	0x40
>>>>> +
>>>>> +/* PRUSS_GPCFG register bits */
>>>>> +#define PRUSS_GPCFG_PRU_GPO_SH_SEL		BIT(25)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_DIV1_SHIFT		20
>>>>> +#define PRUSS_GPCFG_PRU_DIV1_MASK		GENMASK(24, 20)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_DIV0_SHIFT		15
>>>>> +#define PRUSS_GPCFG_PRU_DIV0_MASK		GENMASK(15, 19)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPO_MODE		BIT(14)
>>>>> +#define PRUSS_GPCFG_PRU_GPO_MODE_DIRECT		0
>>>>> +#define PRUSS_GPCFG_PRU_GPO_MODE_SERIAL		BIT(14)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPI_SB			BIT(13)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPI_DIV1_SHIFT		8
>>>>> +#define PRUSS_GPCFG_PRU_GPI_DIV1_MASK		GENMASK(12, 8)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPI_DIV0_SHIFT		3
>>>>> +#define PRUSS_GPCFG_PRU_GPI_DIV0_MASK		GENMASK(7, 3)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_POSITIVE	0
>>>>> +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_NEGATIVE	BIT(2)
>>>>> +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE		BIT(2)
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_GPI_MODE_MASK		GENMASK(1, 0)
>>>>> +#define PRUSS_GPCFG_PRU_GPI_MODE_SHIFT		0
>>>>> +
>>>>> +#define PRUSS_GPCFG_PRU_MUX_SEL_SHIFT		26
>>>>> +#define PRUSS_GPCFG_PRU_MUX_SEL_MASK		GENMASK(29, 26)
>>>>> +
>>>>> +/* PRUSS_MII_RT register bits */
>>>>> +#define PRUSS_MII_RT_EVENT_EN			BIT(0)
>>>>> +
>>>>> +/* PRUSS_SPP register bits */
>>>>> +#define PRUSS_SPP_XFER_SHIFT_EN			BIT(1)
>>>>> +#define PRUSS_SPP_PRU1_PAD_HP_EN		BIT(0)
>>>>
>>>> Can we please move all the above definitions to private driver/soc/ti/pruss.h?
>>>> You can also add pruss_cfg_read and pruss_cfg_update there.
>>>>
>>
>> There is no driver/soc/ti/pruss.h. The pruss.h file is located in
>> include/linux/remoteproc/pruss.h and there is one pruss_driver.h file which is
>> located in include/linux/pruss_driver.h
>>
>> Do you want me to create another header file at driver/soc/ti/pruss.h and place
>> all these definitions inside that?
>>
>> Please let me know.
> 
> Yes. All private definitions should sit in driver/soc/ti/pruss.h
> 

Should I keep the change the name to pruss_internal.h? As we already have a
pruss.h inside include/linux/remoteproc, just to avoid any confusion.

> 
> cheers,
> roger

-- 
Thanks and Regards,
Danish.