cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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regmap-slimbus.c (1946B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2017, Linaro Ltd.
      3
      4#include <linux/regmap.h>
      5#include <linux/slimbus.h>
      6#include <linux/module.h>
      7
      8#include "internal.h"
      9
     10static int regmap_slimbus_write(void *context, const void *data, size_t count)
     11{
     12	struct slim_device *sdev = context;
     13
     14	return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2);
     15}
     16
     17static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
     18			       void *val, size_t val_size)
     19{
     20	struct slim_device *sdev = context;
     21
     22	return slim_read(sdev, *(u16 *)reg, val_size, val);
     23}
     24
     25static const struct regmap_bus regmap_slimbus_bus = {
     26	.write = regmap_slimbus_write,
     27	.read = regmap_slimbus_read,
     28	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
     29	.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
     30};
     31
     32static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
     33					const struct regmap_config *config)
     34{
     35	if (config->val_bits == 8 && config->reg_bits == 16)
     36		return &regmap_slimbus_bus;
     37
     38	return ERR_PTR(-ENOTSUPP);
     39}
     40
     41struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
     42				     const struct regmap_config *config,
     43				     struct lock_class_key *lock_key,
     44				     const char *lock_name)
     45{
     46	const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
     47
     48	if (IS_ERR(bus))
     49		return ERR_CAST(bus);
     50
     51	return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config,
     52			     lock_key, lock_name);
     53}
     54EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
     55
     56struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
     57					  const struct regmap_config *config,
     58					  struct lock_class_key *lock_key,
     59					  const char *lock_name)
     60{
     61	const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
     62
     63	if (IS_ERR(bus))
     64		return ERR_CAST(bus);
     65
     66	return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config,
     67				  lock_key, lock_name);
     68}
     69EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
     70
     71MODULE_LICENSE("GPL v2");