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