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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2026, Beijing ESWIN Computing Technology Co., Ltd..
* All rights reserved.
*
* ESWIN EIC7700 HSP Reset Driver
*
* Authors: Xuyang Dong <dongxuyang@eswincomputing.com>
*/
#include <linux/auxiliary_bus.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <dt-bindings/reset/eswin,eic7700-hspcrg.h>
/**
* struct eic7700_hsp_reset_data - reset controller information structure
* @rcdev: reset controller entity
* @regmap: regmap handle containing the memory-mapped reset registers
*/
struct eic7700_hsp_reset_data {
struct reset_controller_dev rcdev;
struct regmap *regmap;
};
struct eic7700_hsp_reg {
u32 reg;
u32 bit;
bool active_low;
};
static inline struct eic7700_hsp_reset_data *
to_eic7700_hsp_reset(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct eic7700_hsp_reset_data, rcdev);
}
static const struct eic7700_hsp_reg eic7700_hsp_reset[] = {
[EIC7700_HSP_RST_SATA_P0] = {0x340, BIT(0), false},
[EIC7700_HSP_RST_SATA_PHY] = {0x340, BIT(1), false},
[EIC7700_HSP_RST_USB0] = {0x800, BIT(24), true},
[EIC7700_HSP_RST_USB1] = {0x900, BIT(24), true},
[EIC7700_HSP_RST_USB0_PHY] = {0x800, BIT(25), false},
[EIC7700_HSP_RST_USB1_PHY] = {0x900, BIT(25), false},
};
static int eic7700_hsp_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev);
return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg,
eic7700_hsp_reset[id].bit,
!eic7700_hsp_reset[id].active_low);
}
static int eic7700_hsp_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev);
return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg,
eic7700_hsp_reset[id].bit,
eic7700_hsp_reset[id].active_low);
}
static const struct reset_control_ops eic7700_hsp_reset_ops = {
.assert = eic7700_hsp_reset_assert,
.deassert = eic7700_hsp_reset_deassert,
};
static int eic7700_hsp_reset_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct eic7700_hsp_reset_data *data;
struct device *dev = &adev->dev;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regmap = dev_get_regmap(dev->parent, NULL);
if (!data->regmap)
return dev_err_probe(dev, -ENODEV, "failed to get regmap!\n");
data->rcdev.owner = THIS_MODULE;
data->rcdev.ops = &eic7700_hsp_reset_ops;
data->rcdev.of_node = dev->parent->of_node;
data->rcdev.dev = dev;
data->rcdev.nr_resets = ARRAY_SIZE(eic7700_hsp_reset);
return devm_reset_controller_register(dev, &data->rcdev);
}
static const struct auxiliary_device_id eic7700_hsp_reset_ids[] = {
{ .name = "clk_eic7700_hsp.hsp-reset", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(auxiliary, eic7700_hsp_reset_ids);
static struct auxiliary_driver eic7700_hsp_reset_driver = {
.probe = eic7700_hsp_reset_probe,
.id_table = eic7700_hsp_reset_ids,
};
module_auxiliary_driver(eic7700_hsp_reset_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Xuyang Dong <dongxuyang@eswincomputing.com>");
MODULE_DESCRIPTION("ESWIN EIC7700 HSP Reset Controller Driver");
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