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author | Mark Brown <broonie@kernel.org> | 2023-03-26 15:11:12 +0100 |
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committer | Mark Brown <broonie@kernel.org> | 2023-03-30 12:25:42 +0100 |
commit | f6352424e37e7bf72291ceab87dc620172be0999 (patch) | |
tree | cba005c1817e797fbf88034fd306c065a329130b /drivers/base/regmap/regmap-ram.c | |
parent | 1e2bae6ae8f6b404b295edd5ba11a0bb1566544c (diff) | |
download | linux-f6352424e37e7bf72291ceab87dc620172be0999.tar.gz linux-f6352424e37e7bf72291ceab87dc620172be0999.tar.bz2 linux-f6352424e37e7bf72291ceab87dc620172be0999.zip |
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: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-1-b208801dc2c8@kernel.org
Diffstat (limited to 'drivers/base/regmap/regmap-ram.c')
-rw-r--r-- | drivers/base/regmap/regmap-ram.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-ram.c b/drivers/base/regmap/regmap-ram.c new file mode 100644 index 000000000000..85f34a5dee04 --- /dev/null +++ b/drivers/base/regmap/regmap-ram.c @@ -0,0 +1,85 @@ +// 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, ®map_ram, data, config, + lock_key, lock_name); + + return map; +} +EXPORT_SYMBOL_GPL(__regmap_init_ram); + +MODULE_LICENSE("GPL v2"); |