65dd2f6718
Provide a simple, 16 bit only, RAM backed regmap which supports raw I/O for use in testing. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20230610-regcache-raw-kunit-v1-1-583112cd28ac@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Register map access API - Memory region with raw access
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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 unsigned int decode_reg(enum regmap_endian endian, const void *reg)
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{
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const u16 *r = reg;
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if (endian == REGMAP_ENDIAN_BIG)
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return be16_to_cpu(*r);
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else
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return le16_to_cpu(*r);
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}
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static int regmap_raw_ram_gather_write(void *context,
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const void *reg, size_t reg_len,
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const void *val, size_t val_len)
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{
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struct regmap_ram_data *data = context;
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unsigned int r;
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u16 *our_buf = (u16 *)data->vals;
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int i;
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if (reg_len != 2)
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return -EINVAL;
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if (val_len % 2)
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return -EINVAL;
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r = decode_reg(data->reg_endian, reg);
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memcpy(&our_buf[r], val, val_len);
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for (i = 0; i < val_len / 2; i++)
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data->written[r + i] = true;
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return 0;
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}
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static int regmap_raw_ram_write(void *context, const void *data, size_t count)
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{
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return regmap_raw_ram_gather_write(context, data, 2,
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data + 2, count - 2);
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}
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static int regmap_raw_ram_read(void *context,
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const void *reg, size_t reg_len,
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void *val, size_t val_len)
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{
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struct regmap_ram_data *data = context;
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unsigned int r;
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u16 *our_buf = (u16 *)data->vals;
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int i;
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if (reg_len != 2)
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return -EINVAL;
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if (val_len % 2)
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return -EINVAL;
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r = decode_reg(data->reg_endian, reg);
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memcpy(val, &our_buf[r], val_len);
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for (i = 0; i < val_len / 2; i++)
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data->read[r + i] = true;
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return 0;
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}
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static void regmap_raw_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_raw_ram = {
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.fast_io = true,
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.write = regmap_raw_ram_write,
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.gather_write = regmap_raw_ram_gather_write,
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.read = regmap_raw_ram_read,
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.free_context = regmap_raw_ram_free_context,
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};
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struct regmap *__regmap_init_raw_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->reg_bits != 16)
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return ERR_PTR(-EINVAL);
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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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data->reg_endian = config->reg_format_endian;
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map = __regmap_init(NULL, ®map_raw_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_raw_ram);
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MODULE_LICENSE("GPL v2");
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