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Date: Wed, 12 Apr 2023 11:14:34 -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 11:06:54AM -0600, Mathieu Poirier wrote:
> 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
>
With the above:
Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > + 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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