1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * dwc3-generic-plat.c - DesignWare USB3 generic platform driver
4 *
5 * Copyright (C) 2025 Ze Huang <huang.ze@linux.dev>
6 *
7 * Inspired by dwc3-qcom.c and dwc3-of-simple.c
8 */
9
10 #include <linux/clk.h>
11 #include <linux/platform_device.h>
12 #include <linux/reset.h>
13 #include <linux/regmap.h>
14 #include <linux/mfd/syscon.h>
15 #include "glue.h"
16
17 #define EIC7700_HSP_BUS_FILTER_EN BIT(0)
18 #define EIC7700_HSP_BUS_CLKEN_GM BIT(9)
19 #define EIC7700_HSP_BUS_CLKEN_GS BIT(16)
20 #define EIC7700_HSP_AXI_LP_XM_CSYSREQ BIT(0)
21 #define EIC7700_HSP_AXI_LP_XS_CSYSREQ BIT(16)
22
23 struct dwc3_generic {
24 struct device *dev;
25 struct dwc3 dwc;
26 struct clk_bulk_data *clks;
27 int num_clocks;
28 struct reset_control *resets;
29 };
30
31 struct dwc3_generic_config {
32 int (*init)(struct dwc3_generic *dwc3g);
33 struct dwc3_properties properties;
34 };
35
36 #define to_dwc3_generic(d) container_of((d), struct dwc3_generic, dwc)
37
dwc3_generic_reset_control_assert(void * data)38 static void dwc3_generic_reset_control_assert(void *data)
39 {
40 reset_control_assert(data);
41 }
42
dwc3_eic7700_init(struct dwc3_generic * dwc3g)43 static int dwc3_eic7700_init(struct dwc3_generic *dwc3g)
44 {
45 struct device *dev = dwc3g->dev;
46 struct regmap *regmap;
47 u32 hsp_usb_axi_lp;
48 u32 hsp_usb_bus;
49 u32 args[2];
50 u32 val;
51
52 regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node,
53 "eswin,hsp-sp-csr",
54 ARRAY_SIZE(args), args);
55 if (IS_ERR(regmap)) {
56 dev_err(dev, "No hsp-sp-csr phandle specified\n");
57 return PTR_ERR(regmap);
58 }
59
60 hsp_usb_bus = args[0];
61 hsp_usb_axi_lp = args[1];
62
63 regmap_read(regmap, hsp_usb_bus, &val);
64 regmap_write(regmap, hsp_usb_bus, val | EIC7700_HSP_BUS_FILTER_EN |
65 EIC7700_HSP_BUS_CLKEN_GM | EIC7700_HSP_BUS_CLKEN_GS);
66
67 regmap_write(regmap, hsp_usb_axi_lp, EIC7700_HSP_AXI_LP_XM_CSYSREQ |
68 EIC7700_HSP_AXI_LP_XS_CSYSREQ);
69 return 0;
70 }
71
dwc3_generic_probe(struct platform_device * pdev)72 static int dwc3_generic_probe(struct platform_device *pdev)
73 {
74 const struct dwc3_generic_config *plat_config;
75 struct dwc3_probe_data probe_data = {};
76 struct device *dev = &pdev->dev;
77 struct dwc3_generic *dwc3g;
78 struct resource *res;
79 int ret;
80
81 dwc3g = devm_kzalloc(dev, sizeof(*dwc3g), GFP_KERNEL);
82 if (!dwc3g)
83 return -ENOMEM;
84
85 dwc3g->dev = dev;
86
87 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
88 if (!res) {
89 dev_err(&pdev->dev, "missing memory resource\n");
90 return -ENODEV;
91 }
92
93 dwc3g->resets = devm_reset_control_array_get_optional_exclusive(dev);
94 if (IS_ERR(dwc3g->resets))
95 return dev_err_probe(dev, PTR_ERR(dwc3g->resets), "failed to get resets\n");
96
97 ret = reset_control_assert(dwc3g->resets);
98 if (ret)
99 return dev_err_probe(dev, ret, "failed to assert resets\n");
100
101 /* Not strict timing, just for safety */
102 udelay(2);
103
104 ret = reset_control_deassert(dwc3g->resets);
105 if (ret)
106 return dev_err_probe(dev, ret, "failed to deassert resets\n");
107
108 ret = devm_add_action_or_reset(dev, dwc3_generic_reset_control_assert, dwc3g->resets);
109 if (ret)
110 return ret;
111
112 ret = devm_clk_bulk_get_all_enabled(dwc3g->dev, &dwc3g->clks);
113 if (ret < 0)
114 return dev_err_probe(dev, ret, "failed to get clocks\n");
115
116 dwc3g->num_clocks = ret;
117 dwc3g->dwc.dev = dev;
118 probe_data.dwc = &dwc3g->dwc;
119 probe_data.res = res;
120 probe_data.ignore_clocks_and_resets = true;
121
122 plat_config = of_device_get_match_data(dev);
123 if (!plat_config) {
124 probe_data.properties = DWC3_DEFAULT_PROPERTIES;
125 goto core_probe;
126 }
127
128 probe_data.properties = plat_config->properties;
129 if (plat_config->init) {
130 ret = plat_config->init(dwc3g);
131 if (ret)
132 return dev_err_probe(dev, ret,
133 "failed to init platform\n");
134 }
135
136 core_probe:
137 ret = dwc3_core_probe(&probe_data);
138 if (ret)
139 return dev_err_probe(dev, ret, "failed to register DWC3 Core\n");
140
141 return 0;
142 }
143
dwc3_generic_remove(struct platform_device * pdev)144 static void dwc3_generic_remove(struct platform_device *pdev)
145 {
146 struct dwc3 *dwc = platform_get_drvdata(pdev);
147
148 dwc3_core_remove(dwc);
149 }
150
dwc3_generic_suspend(struct device * dev)151 static int dwc3_generic_suspend(struct device *dev)
152 {
153 struct dwc3 *dwc = dev_get_drvdata(dev);
154 struct dwc3_generic *dwc3g = to_dwc3_generic(dwc);
155 int ret;
156
157 ret = dwc3_pm_suspend(dwc);
158 if (ret)
159 return ret;
160
161 clk_bulk_disable_unprepare(dwc3g->num_clocks, dwc3g->clks);
162
163 return 0;
164 }
165
dwc3_generic_resume(struct device * dev)166 static int dwc3_generic_resume(struct device *dev)
167 {
168 struct dwc3 *dwc = dev_get_drvdata(dev);
169 struct dwc3_generic *dwc3g = to_dwc3_generic(dwc);
170 int ret;
171
172 ret = clk_bulk_prepare_enable(dwc3g->num_clocks, dwc3g->clks);
173 if (ret)
174 return ret;
175
176 ret = dwc3_pm_resume(dwc);
177 if (ret)
178 return ret;
179
180 return 0;
181 }
182
dwc3_generic_runtime_suspend(struct device * dev)183 static int dwc3_generic_runtime_suspend(struct device *dev)
184 {
185 return dwc3_runtime_suspend(dev_get_drvdata(dev));
186 }
187
dwc3_generic_runtime_resume(struct device * dev)188 static int dwc3_generic_runtime_resume(struct device *dev)
189 {
190 return dwc3_runtime_resume(dev_get_drvdata(dev));
191 }
192
dwc3_generic_runtime_idle(struct device * dev)193 static int dwc3_generic_runtime_idle(struct device *dev)
194 {
195 return dwc3_runtime_idle(dev_get_drvdata(dev));
196 }
197
198 static const struct dev_pm_ops dwc3_generic_dev_pm_ops = {
199 SYSTEM_SLEEP_PM_OPS(dwc3_generic_suspend, dwc3_generic_resume)
200 RUNTIME_PM_OPS(dwc3_generic_runtime_suspend, dwc3_generic_runtime_resume,
201 dwc3_generic_runtime_idle)
202 };
203
204 static const struct dwc3_generic_config fsl_ls1028_dwc3 = {
205 .properties.gsbuscfg0_reqinfo = 0x2222,
206 };
207
208 static const struct dwc3_generic_config eic7700_dwc3 = {
209 .init = dwc3_eic7700_init,
210 .properties = DWC3_DEFAULT_PROPERTIES,
211 };
212
213 static const struct of_device_id dwc3_generic_of_match[] = {
214 { .compatible = "spacemit,k1-dwc3", },
215 { .compatible = "fsl,ls1028a-dwc3", &fsl_ls1028_dwc3},
216 { .compatible = "eswin,eic7700-dwc3", &eic7700_dwc3},
217 { /* sentinel */ }
218 };
219 MODULE_DEVICE_TABLE(of, dwc3_generic_of_match);
220
221 static struct platform_driver dwc3_generic_driver = {
222 .probe = dwc3_generic_probe,
223 .remove = dwc3_generic_remove,
224 .driver = {
225 .name = "dwc3-generic-plat",
226 .of_match_table = dwc3_generic_of_match,
227 .pm = pm_ptr(&dwc3_generic_dev_pm_ops),
228 },
229 };
230 module_platform_driver(dwc3_generic_driver);
231
232 MODULE_LICENSE("GPL");
233 MODULE_DESCRIPTION("DesignWare USB3 generic platform driver");
234