1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2026, Beijing ESWIN Computing Technology Co., Ltd.. 4 * All rights reserved. 5 * 6 * ESWIN EIC7700 HSP Reset Driver 7 * 8 * Authors: Xuyang Dong <dongxuyang@eswincomputing.com> 9 */ 10 11 #include <linux/auxiliary_bus.h> 12 #include <linux/device.h> 13 #include <linux/module.h> 14 #include <linux/regmap.h> 15 #include <linux/reset-controller.h> 16 17 #include <dt-bindings/reset/eswin,eic7700-hspcrg.h> 18 19 /** 20 * struct eic7700_hsp_reset_data - reset controller information structure 21 * @rcdev: reset controller entity 22 * @regmap: regmap handle containing the memory-mapped reset registers 23 */ 24 struct eic7700_hsp_reset_data { 25 struct reset_controller_dev rcdev; 26 struct regmap *regmap; 27 }; 28 29 struct eic7700_hsp_reg { 30 u32 reg; 31 u32 bit; 32 bool active_low; 33 }; 34 35 static inline struct eic7700_hsp_reset_data * 36 to_eic7700_hsp_reset(struct reset_controller_dev *rcdev) 37 { 38 return container_of(rcdev, struct eic7700_hsp_reset_data, rcdev); 39 } 40 41 static const struct eic7700_hsp_reg eic7700_hsp_reset[] = { 42 [EIC7700_HSP_RST_SATA_P0] = {0x340, BIT(0), false}, 43 [EIC7700_HSP_RST_SATA_PHY] = {0x340, BIT(1), false}, 44 [EIC7700_HSP_RST_USB0] = {0x800, BIT(24), true}, 45 [EIC7700_HSP_RST_USB1] = {0x900, BIT(24), true}, 46 [EIC7700_HSP_RST_USB0_PHY] = {0x800, BIT(25), false}, 47 [EIC7700_HSP_RST_USB1_PHY] = {0x900, BIT(25), false}, 48 }; 49 50 static int eic7700_hsp_reset_assert(struct reset_controller_dev *rcdev, 51 unsigned long id) 52 { 53 struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev); 54 55 return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg, 56 eic7700_hsp_reset[id].bit, 57 !eic7700_hsp_reset[id].active_low); 58 } 59 60 static int eic7700_hsp_reset_deassert(struct reset_controller_dev *rcdev, 61 unsigned long id) 62 { 63 struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev); 64 65 return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg, 66 eic7700_hsp_reset[id].bit, 67 eic7700_hsp_reset[id].active_low); 68 } 69 70 static const struct reset_control_ops eic7700_hsp_reset_ops = { 71 .assert = eic7700_hsp_reset_assert, 72 .deassert = eic7700_hsp_reset_deassert, 73 }; 74 75 static int eic7700_hsp_reset_probe(struct auxiliary_device *adev, 76 const struct auxiliary_device_id *id) 77 { 78 struct eic7700_hsp_reset_data *data; 79 struct device *dev = &adev->dev; 80 81 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 82 if (!data) 83 return -ENOMEM; 84 85 data->regmap = dev_get_regmap(dev->parent, NULL); 86 if (!data->regmap) 87 return dev_err_probe(dev, -ENODEV, "failed to get regmap!\n"); 88 89 data->rcdev.owner = THIS_MODULE; 90 data->rcdev.ops = &eic7700_hsp_reset_ops; 91 data->rcdev.of_node = dev->parent->of_node; 92 data->rcdev.dev = dev; 93 data->rcdev.nr_resets = ARRAY_SIZE(eic7700_hsp_reset); 94 95 return devm_reset_controller_register(dev, &data->rcdev); 96 } 97 98 static const struct auxiliary_device_id eic7700_hsp_reset_ids[] = { 99 { .name = "clk_eic7700_hsp.hsp-reset", }, 100 { /* sentinel */ } 101 }; 102 MODULE_DEVICE_TABLE(auxiliary, eic7700_hsp_reset_ids); 103 104 static struct auxiliary_driver eic7700_hsp_reset_driver = { 105 .probe = eic7700_hsp_reset_probe, 106 .id_table = eic7700_hsp_reset_ids, 107 }; 108 109 module_auxiliary_driver(eic7700_hsp_reset_driver); 110 111 MODULE_LICENSE("GPL"); 112 MODULE_AUTHOR("Xuyang Dong <dongxuyang@eswincomputing.com>"); 113 MODULE_DESCRIPTION("ESWIN EIC7700 HSP Reset Controller Driver"); 114