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