Message-ID: <a3e26ef1-b7e7-f6da-94ff-4a8bf80649f6@ti.com>
Date:   Thu, 16 Mar 2023 16:59:49 +0530
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Subject: Re: [EXTERNAL] Re: [PATCH v4 3/5] soc: ti: pruss: Add
 pruss_cfg_read()/update() API
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From:   Md Danish Anwar <a0501179@ti.com>
To:     Roger Quadros <rogerq@kernel.org>,
        MD Danish Anwar <danishanwar@ti.com>,
        "Andrew F. Davis" <afd@ti.com>, Suman Anna <s-anna@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Santosh Shilimkar <ssantosh@kernel.org>,
        Nishanth Menon <nm@ti.com>
CC:     <linux-remoteproc@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-omap@vger.kernel.org>,
        <srk@ti.com>, <devicetree@vger.kernel.org>,
        <netdev@vger.kernel.org>
References: <20230313111127.1229187-1-danishanwar@ti.com>
 <20230313111127.1229187-4-danishanwar@ti.com>
 <91481d4f-2005-7b33-d3be-df09b7d27ef6@kernel.org>
 <c52ae883-b0c9-8f92-98ae-fb9e9ad30420@ti.com>
Organization: Texas Instruments
In-Reply-To: <c52ae883-b0c9-8f92-98ae-fb9e9ad30420@ti.com>
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Precedence: bulk

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@ti.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@ti.com>
>>> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
>>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
>>> Signed-off-by: Puranjay Mohan <p-mohan@ti.com>
>>> Signed-off-by: MD Danish Anwar <danishanwar@ti.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.

> 
> Sure Roger, I'll move all these definitions to pruss.h
> 
>>> +
>>> +/*
>>> + * enum pruss_gp_mux_sel - PRUSS GPI/O Mux modes for the
>>> + * PRUSS_GPCFG0/1 registers
>>> + *
>>> + * NOTE: The below defines are the most common values, but there
>>> + * are some exceptions like on 66AK2G, where the RESERVED and MII2
>>> + * values are interchanged. Also, this bit-field does not exist on
>>> + * AM335x SoCs
>>> + */
>>> +enum pruss_gp_mux_sel {
>>> +	PRUSS_GP_MUX_SEL_GP = 0,
>>> +	PRUSS_GP_MUX_SEL_ENDAT,
>>> +	PRUSS_GP_MUX_SEL_RESERVED,
>>> +	PRUSS_GP_MUX_SEL_SD,
>>> +	PRUSS_GP_MUX_SEL_MII2,
>>> +	PRUSS_GP_MUX_SEL_MAX,
>>> +};
>>> +
>>> +/*
>>> + * enum pruss_gpi_mode - PRUSS GPI configuration modes, used
>>> + *			 to program the PRUSS_GPCFG0/1 registers
>>> + */
>>> +enum pruss_gpi_mode {
>>> +	PRUSS_GPI_MODE_DIRECT = 0,
>>> +	PRUSS_GPI_MODE_PARALLEL,
>>> +	PRUSS_GPI_MODE_28BIT_SHIFT,
>>> +	PRUSS_GPI_MODE_MII,
>>> +};
>>> +
>>>  /**
>>>   * enum pruss_pru_id - PRU core identifiers
>>>   * @PRUSS_PRU0: PRU Core 0.
>>
>> cheers,
>> -roger
> 

-- 
Thanks and Regards,
Danish.