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regmap: Add FSI bus support

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Add regmap support for the FSI bus.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20221102205148.1334459-2-eajames@linux.ibm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Eddie James 2022-11-02 15:51:44 -05:00 committed by Mark Brown
parent eb7081409f
commit bf0d29fb51
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GPG key ID: 24D68B725D5487D0
4 changed files with 274 additions and 1 deletions
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6
drivers/base/regmap/Kconfig
View file

@ -4,7 +4,7 @@
# subsystems should select the appropriate symbols.
config REGMAP
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO)
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO || REGMAP_FSI)
select IRQ_DOMAIN if REGMAP_IRQ
select MDIO_BUS if REGMAP_MDIO
bool
@ -65,3 +65,7 @@ config REGMAP_I3C
config REGMAP_SPI_AVMM
tristate
depends on SPI
config REGMAP_FSI
tristate
depends on FSI

1
drivers/base/regmap/Makefile
View file

@ -20,3 +20,4 @@ obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o
obj-$(CONFIG_REGMAP_MDIO) += regmap-mdio.o
obj-$(CONFIG_REGMAP_FSI) += regmap-fsi.o

231
drivers/base/regmap/regmap-fsi.c Normal file
View file

@ -0,0 +1,231 @@
// SPDX-License-Identifier: GPL-2.0
//
// Register map access API - FSI support
//
// Copyright 2022 IBM Corp
//
// Author: Eddie James <eajames@linux.ibm.com>
#include <linux/fsi.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include "internal.h"
static int regmap_fsi32_reg_read(void *context, unsigned int reg, unsigned int *val)
{
u32 v;
int ret;
ret = fsi_slave_read(context, reg, &v, sizeof(v));
if (ret)
return ret;
*val = v;
return 0;
}
static int regmap_fsi32_reg_write(void *context, unsigned int reg, unsigned int val)
{
u32 v = val;
return fsi_slave_write(context, reg, &v, sizeof(v));
}
static const struct regmap_bus regmap_fsi32 = {
.reg_write = regmap_fsi32_reg_write,
.reg_read = regmap_fsi32_reg_read,
};
static int regmap_fsi32le_reg_read(void *context, unsigned int reg, unsigned int *val)
{
__be32 v;
int ret;
ret = fsi_slave_read(context, reg, &v, sizeof(v));
if (ret)
return ret;
*val = be32_to_cpu(v);
return 0;
}
static int regmap_fsi32le_reg_write(void *context, unsigned int reg, unsigned int val)
{
__be32 v = cpu_to_be32(val);
return fsi_slave_write(context, reg, &v, sizeof(v));
}
static const struct regmap_bus regmap_fsi32le = {
.reg_write = regmap_fsi32le_reg_write,
.reg_read = regmap_fsi32le_reg_read,
};
static int regmap_fsi16_reg_read(void *context, unsigned int reg, unsigned int *val)
{
u16 v;
int ret;
ret = fsi_slave_read(context, reg, &v, sizeof(v));
if (ret)
return ret;
*val = v;
return 0;
}
static int regmap_fsi16_reg_write(void *context, unsigned int reg, unsigned int val)
{
u16 v;
if (val > 0xffff)
return -EINVAL;
v = val;
return fsi_slave_write(context, reg, &v, sizeof(v));
}
static const struct regmap_bus regmap_fsi16 = {
.reg_write = regmap_fsi16_reg_write,
.reg_read = regmap_fsi16_reg_read,
};
static int regmap_fsi16le_reg_read(void *context, unsigned int reg, unsigned int *val)
{
__be16 v;
int ret;
ret = fsi_slave_read(context, reg, &v, sizeof(v));
if (ret)
return ret;
*val = be16_to_cpu(v);
return 0;
}
static int regmap_fsi16le_reg_write(void *context, unsigned int reg, unsigned int val)
{
__be16 v;
if (val > 0xffff)
return -EINVAL;
v = cpu_to_be16(val);
return fsi_slave_write(context, reg, &v, sizeof(v));
}
static const struct regmap_bus regmap_fsi16le = {
.reg_write = regmap_fsi16le_reg_write,
.reg_read = regmap_fsi16le_reg_read,
};
static int regmap_fsi8_reg_read(void *context, unsigned int reg, unsigned int *val)
{
u8 v;
int ret;
ret = fsi_slave_read(context, reg, &v, sizeof(v));
if (ret)
return ret;
*val = v;
return 0;
}
static int regmap_fsi8_reg_write(void *context, unsigned int reg, unsigned int val)
{
u8 v;
if (val > 0xff)
return -EINVAL;
v = val;
return fsi_slave_write(context, reg, &v, sizeof(v));
}
static const struct regmap_bus regmap_fsi8 = {
.reg_write = regmap_fsi8_reg_write,
.reg_read = regmap_fsi8_reg_read,
};
static const struct regmap_bus *regmap_get_fsi_bus(struct fsi_device *fsi_dev,
const struct regmap_config *config)
{
const struct regmap_bus *bus = NULL;
if (config->reg_bits == 8 || config->reg_bits == 16 || config->reg_bits == 32) {
switch (config->val_bits) {
case 8:
bus = &regmap_fsi8;
break;
case 16:
switch (regmap_get_val_endian(&fsi_dev->dev, NULL, config)) {
case REGMAP_ENDIAN_LITTLE:
#ifdef __LITTLE_ENDIAN
case REGMAP_ENDIAN_NATIVE:
#endif
bus = &regmap_fsi16le;
break;
case REGMAP_ENDIAN_DEFAULT:
case REGMAP_ENDIAN_BIG:
#ifdef __BIG_ENDIAN
case REGMAP_ENDIAN_NATIVE:
#endif
bus = &regmap_fsi16;
break;
default:
break;
}
break;
case 32:
switch (regmap_get_val_endian(&fsi_dev->dev, NULL, config)) {
case REGMAP_ENDIAN_LITTLE:
#ifdef __LITTLE_ENDIAN
case REGMAP_ENDIAN_NATIVE:
#endif
bus = &regmap_fsi32le;
break;
case REGMAP_ENDIAN_DEFAULT:
case REGMAP_ENDIAN_BIG:
#ifdef __BIG_ENDIAN
case REGMAP_ENDIAN_NATIVE:
#endif
bus = &regmap_fsi32;
break;
default:
break;
}
break;
}
}
return bus ?: ERR_PTR(-EOPNOTSUPP);
}
struct regmap *__regmap_init_fsi(struct fsi_device *fsi_dev, const struct regmap_config *config,
struct lock_class_key *lock_key, const char *lock_name)
{
const struct regmap_bus *bus = regmap_get_fsi_bus(fsi_dev, config);
if (IS_ERR(bus))
return ERR_CAST(bus);
return __regmap_init(&fsi_dev->dev, bus, fsi_dev->slave, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_fsi);
struct regmap *__devm_regmap_init_fsi(struct fsi_device *fsi_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key, const char *lock_name)
{
const struct regmap_bus *bus = regmap_get_fsi_bus(fsi_dev, config);
if (IS_ERR(bus))
return ERR_CAST(bus);
return __devm_regmap_init(&fsi_dev->dev, bus, fsi_dev->slave, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_fsi);
MODULE_LICENSE("GPL");

37
include/linux/regmap.h
View file

@ -24,6 +24,7 @@ struct module;
struct clk;
struct device;
struct device_node;
struct fsi_device;
struct i2c_client;
struct i3c_device;
struct irq_domain;
@ -628,6 +629,10 @@ struct regmap *__regmap_init_spi_avmm(struct spi_device *spi,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_fsi(struct fsi_device *fsi_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
@ -693,6 +698,11 @@ struct regmap *__devm_regmap_init_spi_avmm(struct spi_device *spi,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_fsi(struct fsi_device *fsi_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
/*
* Wrapper for regmap_init macros to include a unique lockdep key and name
* for each call. No-op if CONFIG_LOCKDEP is not set.
@ -919,6 +929,19 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__regmap_init_spi_avmm, #config, \
spi, config)
/**
* regmap_init_fsi() - Initialise register map
*
* @fsi_dev: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer to
* a struct regmap.
*/
#define regmap_init_fsi(fsi_dev, config) \
__regmap_lockdep_wrapper(__regmap_init_fsi, #config, fsi_dev, \
config)
/**
* devm_regmap_init() - Initialise managed register map
*
@ -1148,6 +1171,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__devm_regmap_init_spi_avmm, #config, \
spi, config)
/**
* devm_regmap_init_fsi() - Initialise managed register map
*
* @fsi_dev: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer
* to a struct regmap. The regmap will be automatically freed by the
* device management code.
*/
#define devm_regmap_init_fsi(fsi_dev, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_fsi, #config, \
fsi_dev, config)
int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk);
void regmap_mmio_detach_clk(struct regmap *map);
void regmap_exit(struct regmap *map);