Re: [PATCH v5 3/5] soc: ti: pruss: Add pruss_cfg_read()/update() API

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Thu, Mar 23, 2023 at 11:54:49AM +0530, 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 |   1 +
>  drivers/soc/ti/pruss.h | 112 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 113 insertions(+)
>  create mode 100644 drivers/soc/ti/pruss.h
>

This patch doesn't compile without warnings.

> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
> index 126b672b9b30..2fa7df667592 100644
> --- a/drivers/soc/ti/pruss.c
> +++ b/drivers/soc/ti/pruss.c
> @@ -21,6 +21,7 @@
>  #include <linux/regmap.h>
>  #include <linux/remoteproc.h>
>  #include <linux/slab.h>
> +#include "pruss.h"
>  
>  /**
>   * struct pruss_private_data - PRUSS driver private data
> diff --git a/drivers/soc/ti/pruss.h b/drivers/soc/ti/pruss.h
> new file mode 100644
> index 000000000000..4626d5f6b874
> --- /dev/null
> +++ b/drivers/soc/ti/pruss.h
> @@ -0,0 +1,112 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * PRU-ICSS Subsystem user interfaces
> + *
> + * Copyright (C) 2015-2023 Texas Instruments Incorporated - http://www.ti.com
> + *	MD Danish Anwar <danishanwar@ti.com>
> + */
> +
> +#ifndef _SOC_TI_PRUSS_H_
> +#define _SOC_TI_PRUSS_H_
> +
> +#include <linux/bits.h>
> +#include <linux/regmap.h>
> +
> +/*
> + * 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)
> +#define PRUSS_SPP_RTU_XFR_SHIFT_EN              BIT(3)
> +
> +/**
> + * 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);
> +}
> +
> +#endif  /* _SOC_TI_PRUSS_H_ */
> -- 
> 2.25.1
>