Message-ID: <c52ae883-b0c9-8f92-98ae-fb9e9ad30420@ti.com>
Date:   Thu, 16 Mar 2023 16:38:09 +0530
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Subject: Re: [EXTERNAL] Re: [PATCH v4 3/5] soc: ti: pruss: Add
 pruss_cfg_read()/update() API
Content-Language: en-US
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>
From:   Md Danish Anwar <a0501179@ti.com>
Organization: Texas Instruments
In-Reply-To: <91481d4f-2005-7b33-d3be-df09b7d27ef6@kernel.org>
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Precedence: bulk


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.
> 

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.