Commit f6352424 authored by Mark Brown's avatar Mark Brown

regmap: Add RAM backed register map

Add a register map that is a simple array of memory, for use in
KUnit testing of the framework. This is not exposed in regmap.h
since I can't think of a non-test use case, it is purely for use
internally. To facilitate testing we track if registers have been
read or written to.
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-1-b208801dc2c8@kernel.org
parent 1e2bae6a
...@@ -41,6 +41,9 @@ config REGMAP_MMIO ...@@ -41,6 +41,9 @@ config REGMAP_MMIO
config REGMAP_IRQ config REGMAP_IRQ
bool bool
config REGMAP_RAM
tristate
config REGMAP_SOUNDWIRE config REGMAP_SOUNDWIRE
tristate tristate
depends on SOUNDWIRE depends on SOUNDWIRE
......
...@@ -7,6 +7,7 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o ...@@ -7,6 +7,7 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
obj-$(CONFIG_REGMAP_RAM) += regmap-ram.o
obj-$(CONFIG_REGMAP_SLIMBUS) += regmap-slimbus.o obj-$(CONFIG_REGMAP_SLIMBUS) += regmap-slimbus.o
obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
......
...@@ -306,4 +306,23 @@ static inline unsigned int regcache_get_index_by_order(const struct regmap *map, ...@@ -306,4 +306,23 @@ static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
return reg >> map->reg_stride_order; return reg >> map->reg_stride_order;
} }
struct regmap_ram_data {
unsigned int *vals; /* Allocatd by caller */
bool *read;
bool *written;
};
/*
* Create a test register map with data stored in RAM, not intended
* for practical use.
*/
struct regmap *__regmap_init_ram(const struct regmap_config *config,
struct regmap_ram_data *data,
struct lock_class_key *lock_key,
const char *lock_name);
#define regmap_init_ram(config, data) \
__regmap_lockdep_wrapper(__regmap_init_ram, #config, config, data)
#endif #endif
// SPDX-License-Identifier: GPL-2.0
//
// Register map access API - Memory region
//
// This is intended for testing only
//
// Copyright (c) 2023, Arm Ltd
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/swab.h>
#include "internal.h"
static int regmap_ram_write(void *context, unsigned int reg, unsigned int val)
{
struct regmap_ram_data *data = context;
data->vals[reg] = val;
data->written[reg] = true;
return 0;
}
static int regmap_ram_read(void *context, unsigned int reg, unsigned int *val)
{
struct regmap_ram_data *data = context;
*val = data->vals[reg];
data->read[reg] = true;
return 0;
}
static void regmap_ram_free_context(void *context)
{
struct regmap_ram_data *data = context;
kfree(data->vals);
kfree(data->read);
kfree(data->written);
kfree(data);
}
static const struct regmap_bus regmap_ram = {
.fast_io = true,
.reg_write = regmap_ram_write,
.reg_read = regmap_ram_read,
.free_context = regmap_ram_free_context,
};
struct regmap *__regmap_init_ram(const struct regmap_config *config,
struct regmap_ram_data *data,
struct lock_class_key *lock_key,
const char *lock_name)
{
struct regmap *map;
if (!config->max_register) {
pr_crit("No max_register specified for RAM regmap\n");
return ERR_PTR(-EINVAL);
}
data->read = kcalloc(sizeof(bool), config->max_register + 1,
GFP_KERNEL);
if (!data->read)
return ERR_PTR(-ENOMEM);
data->written = kcalloc(sizeof(bool), config->max_register + 1,
GFP_KERNEL);
if (!data->written)
return ERR_PTR(-ENOMEM);
map = __regmap_init(NULL, &regmap_ram, data, config,
lock_key, lock_name);
return map;
}
EXPORT_SYMBOL_GPL(__regmap_init_ram);
MODULE_LICENSE("GPL v2");
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