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Date: Wed, 12 Apr 2023 11:06:54 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: MD Danish Anwar <danishanwar@...com>
Cc: "Andrew F. Davis" <afd@...com>, Suman Anna <s-anna@...com>,
Roger Quadros <rogerq@...nel.org>,
Vignesh Raghavendra <vigneshr@...com>,
Tero Kristo <kristo@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Santosh Shilimkar <ssantosh@...nel.org>,
Nishanth Menon <nm@...com>, 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: [PATCH v8 3/4] soc: ti: pruss: Add pruss_cfg_read()/update(),
pruss_cfg_get_gpmux()/set_gpmux() APIs
On Wed, Apr 12, 2023 at 04:00:11PM +0530, 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.
>
> Add two new helper functions pruss_cfg_get_gpmux() & pruss_cfg_set_gpmux()
> to get and set the GP MUX mode for programming the PRUSS internal wrapper
> mux functionality as needed by usecases.
>
> 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>
> Reviewed-by: Roger Quadros <rogerq@...nel.org>
> Reviewed-by: Tony Lindgren <tony@...mide.com>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> ---
> drivers/soc/ti/pruss.c | 45 ++++++++++++++++++
> drivers/soc/ti/pruss.h | 88 ++++++++++++++++++++++++++++++++++++
> include/linux/pruss_driver.h | 32 +++++++++++++
> 3 files changed, 165 insertions(+)
> create mode 100644 drivers/soc/ti/pruss.h
>
> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
> index 8ada3758b31a..34d513816a9d 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
> @@ -168,6 +169,50 @@ int pruss_release_mem_region(struct pruss *pruss,
> }
> EXPORT_SYMBOL_GPL(pruss_release_mem_region);
>
> +/**
> + * pruss_cfg_get_gpmux() - get the current GPMUX value for a PRU device
> + * @pruss: pruss instance
> + * @pru_id: PRU identifier (0-1)
> + * @mux: pointer to store the current mux value into
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +int pruss_cfg_get_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 *mux)
> +{
> + int ret = 0;
Variable initialization is not needed.
> + u32 val;
> +
> + if (pru_id < 0 || pru_id >= PRUSS_NUM_PRUS || !mux)
If @pru_id is an enum, how can it be smaller than 0?
> + return -EINVAL;
> +
> + ret = pruss_cfg_read(pruss, PRUSS_CFG_GPCFG(pru_id), &val);
> + if (!ret)
> + *mux = (u8)((val & PRUSS_GPCFG_PRU_MUX_SEL_MASK) >>
> + PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(pruss_cfg_get_gpmux);
> +
> +/**
> + * pruss_cfg_set_gpmux() - set the GPMUX value for a PRU device
> + * @pruss: pruss instance
> + * @pru_id: PRU identifier (0-1)
> + * @mux: new mux value for PRU
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +int pruss_cfg_set_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 mux)
> +{
> + if (mux >= PRUSS_GP_MUX_SEL_MAX ||
> + pru_id < 0 || pru_id >= PRUSS_NUM_PRUS)
Same
> + return -EINVAL;
> +
> + return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
> + PRUSS_GPCFG_PRU_MUX_SEL_MASK,
> + (u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
> +}
> +EXPORT_SYMBOL_GPL(pruss_cfg_set_gpmux);
> +
> static void pruss_of_free_clk_provider(void *data)
> {
> struct device_node *clk_mux_np = data;
> diff --git a/drivers/soc/ti/pruss.h b/drivers/soc/ti/pruss.h
> new file mode 100644
> index 000000000000..6c55987e0e55
> --- /dev/null
> +++ b/drivers/soc/ti/pruss.h
> @@ -0,0 +1,88 @@
> +/* 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@...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_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_ */
> diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_driver.h
> index c8f2e53b911b..c70e08c90165 100644
> --- a/include/linux/pruss_driver.h
> +++ b/include/linux/pruss_driver.h
> @@ -14,6 +14,24 @@
> #include <linux/types.h>
> #include <linux/err.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,
Initialization not needed
> + 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_mem - PRUSS memory range identifiers
> */
> @@ -66,6 +84,8 @@ int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
> struct pruss_mem_region *region);
> int pruss_release_mem_region(struct pruss *pruss,
> struct pruss_mem_region *region);
> +int pruss_cfg_get_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 *mux);
> +int pruss_cfg_set_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 mux);
>
> #else
>
> @@ -89,6 +109,18 @@ static inline int pruss_release_mem_region(struct pruss *pruss,
> return -EOPNOTSUPP;
> }
>
> +static inline int pruss_cfg_get_gpmux(struct pruss *pruss,
> + enum pruss_pru_id pru_id, u8 *mux)
> +{
> + return ERR_PTR(-EOPNOTSUPP);
> +}
> +
> +static inline int pruss_cfg_set_gpmux(struct pruss *pruss,
> + enum pruss_pru_id pru_id, u8 mux)
> +{
> + return ERR_PTR(-EOPNOTSUPP);
> +}
> +
> #endif /* CONFIG_TI_PRUSS */
>
> #endif /* _PRUSS_DRIVER_H_ */
> --
> 2.34.1
>
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