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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
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4 changed files with 108 additions and 0 deletions
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@ -41,6 +41,9 @@ config REGMAP_MMIO
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config REGMAP_IRQ
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bool
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config REGMAP_RAM
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tristate
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config REGMAP_SOUNDWIRE
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tristate
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depends on SOUNDWIRE
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@ -7,6 +7,7 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
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obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
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obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
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obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
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obj-$(CONFIG_REGMAP_RAM) += regmap-ram.o
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obj-$(CONFIG_REGMAP_SLIMBUS) += regmap-slimbus.o
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obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
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obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
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@ -306,4 +306,23 @@ static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
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return reg >> map->reg_stride_order;
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}
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struct regmap_ram_data {
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unsigned int *vals; /* Allocatd by caller */
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bool *read;
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bool *written;
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};
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/*
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* Create a test register map with data stored in RAM, not intended
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* for practical use.
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*/
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struct regmap *__regmap_init_ram(const struct regmap_config *config,
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struct regmap_ram_data *data,
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struct lock_class_key *lock_key,
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const char *lock_name);
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#define regmap_init_ram(config, data) \
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__regmap_lockdep_wrapper(__regmap_init_ram, #config, config, data)
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#endif
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85
drivers/base/regmap/regmap-ram.c
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85
drivers/base/regmap/regmap-ram.c
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@ -0,0 +1,85 @@
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// SPDX-License-Identifier: GPL-2.0
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//
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// Register map access API - Memory region
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//
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// This is intended for testing only
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//
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// Copyright (c) 2023, Arm Ltd
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/swab.h>
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#include "internal.h"
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static int regmap_ram_write(void *context, unsigned int reg, unsigned int val)
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{
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struct regmap_ram_data *data = context;
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data->vals[reg] = val;
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data->written[reg] = true;
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return 0;
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}
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static int regmap_ram_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct regmap_ram_data *data = context;
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*val = data->vals[reg];
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data->read[reg] = true;
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return 0;
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}
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static void regmap_ram_free_context(void *context)
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{
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struct regmap_ram_data *data = context;
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kfree(data->vals);
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kfree(data->read);
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kfree(data->written);
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kfree(data);
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}
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static const struct regmap_bus regmap_ram = {
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.fast_io = true,
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.reg_write = regmap_ram_write,
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.reg_read = regmap_ram_read,
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.free_context = regmap_ram_free_context,
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};
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struct regmap *__regmap_init_ram(const struct regmap_config *config,
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struct regmap_ram_data *data,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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struct regmap *map;
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if (!config->max_register) {
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pr_crit("No max_register specified for RAM regmap\n");
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return ERR_PTR(-EINVAL);
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}
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data->read = kcalloc(sizeof(bool), config->max_register + 1,
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GFP_KERNEL);
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if (!data->read)
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return ERR_PTR(-ENOMEM);
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data->written = kcalloc(sizeof(bool), config->max_register + 1,
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GFP_KERNEL);
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if (!data->written)
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return ERR_PTR(-ENOMEM);
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map = __regmap_init(NULL, ®map_ram, data, config,
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lock_key, lock_name);
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return map;
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}
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EXPORT_SYMBOL_GPL(__regmap_init_ram);
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MODULE_LICENSE("GPL v2");
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