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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e76ad18b56
SLIMbus supports upto 16 bytes in value management messages, so add support to read/writes upto 16 bytes. This also removes redundant single register reg_read/reg_write. Also useful for paged register access on SLIMbus interfaced codecs. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2017, Linaro Ltd.
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#include <linux/regmap.h>
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#include <linux/slimbus.h>
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#include <linux/module.h>
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#include "internal.h"
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static int regmap_slimbus_write(void *context, const void *data, size_t count)
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{
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struct slim_device *sdev = context;
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return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2);
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}
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static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct slim_device *sdev = context;
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return slim_read(sdev, *(u16 *)reg, val_size, val);
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}
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static struct regmap_bus regmap_slimbus_bus = {
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.write = regmap_slimbus_write,
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.read = regmap_slimbus_read,
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.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
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.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
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};
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static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
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const struct regmap_config *config)
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{
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if (config->val_bits == 8 && config->reg_bits == 16)
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return ®map_slimbus_bus;
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return ERR_PTR(-ENOTSUPP);
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}
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struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
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const struct regmap_config *config,
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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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const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
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struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
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const struct regmap_config *config,
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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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const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
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MODULE_LICENSE("GPL v2");
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