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