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soc: ti: pruss: Add pruss_cfg_read()/update(), pruss_cfg_get_gpmux()/set_gpmux() APIs

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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@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>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://lore.kernel.org/r/20230414045542.3249939-4-danishanwar@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Suman Anna 2023-04-14 10:25:41 +05:30 committed by Nishanth Menon
parent b789ca1e33
commit 51b5760e56
3 changed files with 165 additions and 0 deletions
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45
drivers/soc/ti/pruss.c
View File

@ -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;
u32 val;
if (pru_id >= PRUSS_NUM_PRUS || !mux)
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 >= PRUSS_NUM_PRUS)
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;

88
drivers/soc/ti/pruss.h Normal file
View File

@ -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@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_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_ */

32
include/linux/pruss_driver.h
View File

@ -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,
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_ */