1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Cadence USBSS DRD Driver.
4 *
5 * Copyright (C) 2018-2020 Cadence.
6 * Copyright (C) 2017-2018 NXP
7 * Copyright (C) 2019 Texas Instruments
8 *
9 *
10 * Author: Peter Chen <peter.chen@nxp.com>
11 * Pawel Laszczak <pawell@cadence.com>
12 * Roger Quadros <rogerq@ti.com>
13 */
14
15 #include <linux/module.h>
16 #include <linux/irq.h>
17 #include <linux/kernel.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
21
22 #include "core.h"
23 #include "gadget-export.h"
24 #include "drd.h"
25
set_phy_power_on(struct cdns * cdns)26 static int set_phy_power_on(struct cdns *cdns)
27 {
28 int ret;
29
30 ret = phy_power_on(cdns->usb2_phy);
31 if (ret)
32 return ret;
33
34 ret = phy_power_on(cdns->usb3_phy);
35 if (ret)
36 phy_power_off(cdns->usb2_phy);
37
38 return ret;
39 }
40
set_phy_power_off(struct cdns * cdns)41 static void set_phy_power_off(struct cdns *cdns)
42 {
43 phy_power_off(cdns->usb3_phy);
44 phy_power_off(cdns->usb2_phy);
45 }
46
47 /**
48 * cdns3_plat_probe - probe for cdns3 core device
49 * @pdev: Pointer to cdns3 core platform device
50 *
51 * Returns 0 on success otherwise negative errno
52 */
cdns3_plat_probe(struct platform_device * pdev)53 static int cdns3_plat_probe(struct platform_device *pdev)
54 {
55 struct device *dev = &pdev->dev;
56 struct resource *res;
57 struct cdns *cdns;
58 void __iomem *regs;
59 int ret;
60
61 cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
62 if (!cdns)
63 return -ENOMEM;
64
65 cdns->dev = dev;
66 cdns->pdata = dev_get_platdata(dev);
67
68 platform_set_drvdata(pdev, cdns);
69
70 ret = platform_get_irq_byname(pdev, "host");
71 if (ret < 0)
72 return ret;
73
74 cdns->xhci_res[0].start = ret;
75 cdns->xhci_res[0].end = ret;
76 cdns->xhci_res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(ret);
77 cdns->xhci_res[0].name = "host";
78
79 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
80 if (!res) {
81 dev_err(dev, "couldn't get xhci resource\n");
82 return -ENXIO;
83 }
84
85 cdns->xhci_res[1] = *res;
86
87 cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
88
89 if (cdns->dev_irq < 0)
90 return dev_err_probe(dev, cdns->dev_irq,
91 "Failed to get peripheral IRQ\n");
92
93 regs = devm_platform_ioremap_resource_byname(pdev, "dev");
94 if (IS_ERR(regs))
95 return dev_err_probe(dev, PTR_ERR(regs),
96 "Failed to get dev base\n");
97
98 cdns->dev_regs = regs;
99
100 cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
101 if (cdns->otg_irq < 0)
102 return dev_err_probe(dev, cdns->otg_irq,
103 "Failed to get otg IRQ\n");
104
105 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
106 if (!res) {
107 dev_err(dev, "couldn't get otg resource\n");
108 return -ENXIO;
109 }
110
111 cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
112
113 cdns->otg_res = *res;
114
115 cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
116 if (cdns->wakeup_irq == -EPROBE_DEFER)
117 return cdns->wakeup_irq;
118
119 if (cdns->wakeup_irq < 0) {
120 dev_dbg(dev, "couldn't get wakeup irq\n");
121 cdns->wakeup_irq = 0x0;
122 }
123
124 cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
125 if (IS_ERR(cdns->usb2_phy))
126 return dev_err_probe(dev, PTR_ERR(cdns->usb2_phy),
127 "Failed to get cdn3,usb2-phy\n");
128
129 ret = phy_init(cdns->usb2_phy);
130 if (ret)
131 return ret;
132
133 cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
134 if (IS_ERR(cdns->usb3_phy))
135 return dev_err_probe(dev, PTR_ERR(cdns->usb3_phy),
136 "Failed to get cdn3,usb3-phy\n");
137
138 ret = phy_init(cdns->usb3_phy);
139 if (ret)
140 goto err_phy3_init;
141
142 ret = set_phy_power_on(cdns);
143 if (ret)
144 goto err_phy_power_on;
145
146 cdns->gadget_init = cdns3_gadget_init;
147
148 ret = cdns_init(cdns);
149 if (ret)
150 goto err_cdns_init;
151
152 device_set_wakeup_capable(dev, true);
153 pm_runtime_set_active(dev);
154 pm_runtime_enable(dev);
155 if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
156 pm_runtime_forbid(dev);
157
158 /*
159 * The controller needs less time between bus and controller suspend,
160 * and we also needs a small delay to avoid frequently entering low
161 * power mode.
162 */
163 pm_runtime_set_autosuspend_delay(dev, 20);
164 pm_runtime_mark_last_busy(dev);
165 pm_runtime_use_autosuspend(dev);
166
167 return 0;
168
169 err_cdns_init:
170 set_phy_power_off(cdns);
171 err_phy_power_on:
172 phy_exit(cdns->usb3_phy);
173 err_phy3_init:
174 phy_exit(cdns->usb2_phy);
175
176 return ret;
177 }
178
179 /**
180 * cdns3_plat_remove() - unbind drd driver and clean up
181 * @pdev: Pointer to Linux platform device
182 */
cdns3_plat_remove(struct platform_device * pdev)183 static void cdns3_plat_remove(struct platform_device *pdev)
184 {
185 struct cdns *cdns = platform_get_drvdata(pdev);
186 struct device *dev = cdns->dev;
187
188 pm_runtime_get_sync(dev);
189 pm_runtime_disable(dev);
190 pm_runtime_put_noidle(dev);
191 cdns_remove(cdns);
192 set_phy_power_off(cdns);
193 phy_exit(cdns->usb2_phy);
194 phy_exit(cdns->usb3_phy);
195 }
196
197 #ifdef CONFIG_PM
198
cdns3_set_platform_suspend(struct device * dev,bool suspend,bool wakeup)199 static int cdns3_set_platform_suspend(struct device *dev,
200 bool suspend, bool wakeup)
201 {
202 struct cdns *cdns = dev_get_drvdata(dev);
203 int ret = 0;
204
205 if (cdns->pdata && cdns->pdata->platform_suspend)
206 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
207
208 return ret;
209 }
210
cdns3_controller_suspend(struct device * dev,pm_message_t msg)211 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
212 {
213 struct cdns *cdns = dev_get_drvdata(dev);
214 bool wakeup;
215 unsigned long flags;
216
217 if (cdns->in_lpm)
218 return 0;
219
220 if (PMSG_IS_AUTO(msg))
221 wakeup = true;
222 else
223 wakeup = device_may_wakeup(dev);
224
225 cdns3_set_platform_suspend(cdns->dev, true, wakeup);
226 set_phy_power_off(cdns);
227 spin_lock_irqsave(&cdns->lock, flags);
228 cdns->in_lpm = true;
229 spin_unlock_irqrestore(&cdns->lock, flags);
230 dev_dbg(cdns->dev, "%s ends\n", __func__);
231
232 return 0;
233 }
234
cdns3_controller_resume(struct device * dev,pm_message_t msg)235 static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
236 {
237 struct cdns *cdns = dev_get_drvdata(dev);
238 int ret;
239 unsigned long flags;
240
241 if (!cdns->in_lpm)
242 return 0;
243
244 if (cdns_power_is_lost(cdns)) {
245 phy_exit(cdns->usb2_phy);
246 ret = phy_init(cdns->usb2_phy);
247 if (ret)
248 return ret;
249
250 phy_exit(cdns->usb3_phy);
251 ret = phy_init(cdns->usb3_phy);
252 if (ret)
253 return ret;
254 }
255
256 ret = set_phy_power_on(cdns);
257 if (ret)
258 return ret;
259
260 cdns3_set_platform_suspend(cdns->dev, false, false);
261
262 spin_lock_irqsave(&cdns->lock, flags);
263 cdns_resume(cdns);
264 cdns->in_lpm = false;
265 spin_unlock_irqrestore(&cdns->lock, flags);
266 cdns_set_active(cdns, !PMSG_IS_AUTO(msg));
267 if (cdns->wakeup_pending) {
268 cdns->wakeup_pending = false;
269 enable_irq(cdns->wakeup_irq);
270 }
271 dev_dbg(cdns->dev, "%s ends\n", __func__);
272
273 return ret;
274 }
275
cdns3_plat_runtime_suspend(struct device * dev)276 static int cdns3_plat_runtime_suspend(struct device *dev)
277 {
278 return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
279 }
280
cdns3_plat_runtime_resume(struct device * dev)281 static int cdns3_plat_runtime_resume(struct device *dev)
282 {
283 return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
284 }
285
286 #ifdef CONFIG_PM_SLEEP
287
cdns3_plat_suspend(struct device * dev)288 static int cdns3_plat_suspend(struct device *dev)
289 {
290 struct cdns *cdns = dev_get_drvdata(dev);
291 int ret;
292
293 cdns_suspend(cdns);
294
295 ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
296 if (ret)
297 return ret;
298
299 if (device_may_wakeup(dev) && cdns->wakeup_irq)
300 enable_irq_wake(cdns->wakeup_irq);
301
302 return ret;
303 }
304
cdns3_plat_resume(struct device * dev)305 static int cdns3_plat_resume(struct device *dev)
306 {
307 return cdns3_controller_resume(dev, PMSG_RESUME);
308 }
309 #endif /* CONFIG_PM_SLEEP */
310 #endif /* CONFIG_PM */
311
312 static const struct dev_pm_ops cdns3_pm_ops = {
313 SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
314 SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
315 cdns3_plat_runtime_resume, NULL)
316 };
317
318 #ifdef CONFIG_OF
319 static const struct of_device_id of_cdns3_match[] = {
320 { .compatible = "cdns,usb3" },
321 { },
322 };
323 MODULE_DEVICE_TABLE(of, of_cdns3_match);
324 #endif
325
326 static struct platform_driver cdns3_driver = {
327 .probe = cdns3_plat_probe,
328 .remove = cdns3_plat_remove,
329 .driver = {
330 .name = "cdns-usb3",
331 .of_match_table = of_match_ptr(of_cdns3_match),
332 .pm = &cdns3_pm_ops,
333 },
334 };
335
336 module_platform_driver(cdns3_driver);
337
338 MODULE_ALIAS("platform:cdns3");
339 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
340 MODULE_LICENSE("GPL v2");
341 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
342