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14#include <linux/dma-mapping.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/pm_runtime.h>
21
22#include "gadget.h"
23#include "core.h"
24#include "host-export.h"
25#include "gadget-export.h"
26#include "drd.h"
27
28static int cdns3_idle_init(struct cdns3 *cdns);
29
30static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
31{
32 int ret;
33
34 if (WARN_ON(role > USB_ROLE_DEVICE))
35 return 0;
36
37 mutex_lock(&cdns->mutex);
38 cdns->role = role;
39 mutex_unlock(&cdns->mutex);
40
41 if (!cdns->roles[role])
42 return -ENXIO;
43
44 if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
45 return 0;
46
47 mutex_lock(&cdns->mutex);
48 ret = cdns->roles[role]->start(cdns);
49 if (!ret)
50 cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
51 mutex_unlock(&cdns->mutex);
52
53 return ret;
54}
55
56static void cdns3_role_stop(struct cdns3 *cdns)
57{
58 enum usb_role role = cdns->role;
59
60 if (WARN_ON(role > USB_ROLE_DEVICE))
61 return;
62
63 if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
64 return;
65
66 mutex_lock(&cdns->mutex);
67 cdns->roles[role]->stop(cdns);
68 cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
69 mutex_unlock(&cdns->mutex);
70}
71
72static void cdns3_exit_roles(struct cdns3 *cdns)
73{
74 cdns3_role_stop(cdns);
75 cdns3_drd_exit(cdns);
76}
77
78
79
80
81
82
83
84static int cdns3_core_init_role(struct cdns3 *cdns)
85{
86 struct device *dev = cdns->dev;
87 enum usb_dr_mode best_dr_mode;
88 enum usb_dr_mode dr_mode;
89 int ret;
90
91 dr_mode = usb_get_dr_mode(dev);
92 cdns->role = USB_ROLE_NONE;
93
94
95
96
97
98
99 if (dr_mode == USB_DR_MODE_UNKNOWN) {
100 if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
101 IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
102 dr_mode = USB_DR_MODE_OTG;
103 else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
104 dr_mode = USB_DR_MODE_HOST;
105 else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
106 dr_mode = USB_DR_MODE_PERIPHERAL;
107 }
108
109
110
111
112
113 best_dr_mode = cdns->dr_mode;
114
115 ret = cdns3_idle_init(cdns);
116 if (ret)
117 return ret;
118
119 if (dr_mode == USB_DR_MODE_OTG) {
120 best_dr_mode = cdns->dr_mode;
121 } else if (cdns->dr_mode == USB_DR_MODE_OTG) {
122 best_dr_mode = dr_mode;
123 } else if (cdns->dr_mode != dr_mode) {
124 dev_err(dev, "Incorrect DRD configuration\n");
125 return -EINVAL;
126 }
127
128 dr_mode = best_dr_mode;
129
130 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
131 ret = cdns3_host_init(cdns);
132 if (ret) {
133 dev_err(dev, "Host initialization failed with %d\n",
134 ret);
135 goto err;
136 }
137 }
138
139 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
140 ret = cdns3_gadget_init(cdns);
141 if (ret) {
142 dev_err(dev, "Device initialization failed with %d\n",
143 ret);
144 goto err;
145 }
146 }
147
148 cdns->dr_mode = dr_mode;
149
150 ret = cdns3_drd_update_mode(cdns);
151 if (ret)
152 goto err;
153
154
155 ret = cdns3_role_start(cdns, USB_ROLE_NONE);
156 if (ret)
157 goto err;
158
159 switch (cdns->dr_mode) {
160 case USB_DR_MODE_OTG:
161 ret = cdns3_hw_role_switch(cdns);
162 if (ret)
163 goto err;
164 break;
165 case USB_DR_MODE_PERIPHERAL:
166 ret = cdns3_role_start(cdns, USB_ROLE_DEVICE);
167 if (ret)
168 goto err;
169 break;
170 case USB_DR_MODE_HOST:
171 ret = cdns3_role_start(cdns, USB_ROLE_HOST);
172 if (ret)
173 goto err;
174 break;
175 default:
176 ret = -EINVAL;
177 goto err;
178 }
179
180 return 0;
181err:
182 cdns3_exit_roles(cdns);
183 return ret;
184}
185
186
187
188
189
190
191
192static enum usb_role cdns3_hw_role_state_machine(struct cdns3 *cdns)
193{
194 enum usb_role role = USB_ROLE_NONE;
195 int id, vbus;
196
197 if (cdns->dr_mode != USB_DR_MODE_OTG) {
198 if (cdns3_is_host(cdns))
199 role = USB_ROLE_HOST;
200 if (cdns3_is_device(cdns))
201 role = USB_ROLE_DEVICE;
202
203 return role;
204 }
205
206 id = cdns3_get_id(cdns);
207 vbus = cdns3_get_vbus(cdns);
208
209
210
211
212
213
214
215 role = cdns->role;
216
217 switch (role) {
218 case USB_ROLE_NONE:
219
220
221
222
223 if (!id)
224 role = USB_ROLE_HOST;
225 else if (vbus)
226 role = USB_ROLE_DEVICE;
227 break;
228 case USB_ROLE_HOST:
229 if (id)
230 role = USB_ROLE_NONE;
231 break;
232 case USB_ROLE_DEVICE:
233 if (!vbus)
234 role = USB_ROLE_NONE;
235 break;
236 }
237
238 dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
239
240 return role;
241}
242
243static int cdns3_idle_role_start(struct cdns3 *cdns)
244{
245 return 0;
246}
247
248static void cdns3_idle_role_stop(struct cdns3 *cdns)
249{
250
251 phy_reset(cdns->usb3_phy);
252}
253
254static int cdns3_idle_init(struct cdns3 *cdns)
255{
256 struct cdns3_role_driver *rdrv;
257
258 rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
259 if (!rdrv)
260 return -ENOMEM;
261
262 rdrv->start = cdns3_idle_role_start;
263 rdrv->stop = cdns3_idle_role_stop;
264 rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
265 rdrv->suspend = NULL;
266 rdrv->resume = NULL;
267 rdrv->name = "idle";
268
269 cdns->roles[USB_ROLE_NONE] = rdrv;
270
271 return 0;
272}
273
274
275
276
277
278int cdns3_hw_role_switch(struct cdns3 *cdns)
279{
280 enum usb_role real_role, current_role;
281 int ret = 0;
282
283
284 if (cdns->role_sw)
285 return 0;
286
287 pm_runtime_get_sync(cdns->dev);
288
289 current_role = cdns->role;
290 real_role = cdns3_hw_role_state_machine(cdns);
291
292
293 if (current_role == real_role)
294 goto exit;
295
296 cdns3_role_stop(cdns);
297
298 dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
299
300 ret = cdns3_role_start(cdns, real_role);
301 if (ret) {
302
303 dev_err(cdns->dev, "set %d has failed, back to %d\n",
304 real_role, current_role);
305 ret = cdns3_role_start(cdns, current_role);
306 if (ret)
307 dev_err(cdns->dev, "back to %d failed too\n",
308 current_role);
309 }
310exit:
311 pm_runtime_put_sync(cdns->dev);
312 return ret;
313}
314
315
316
317
318
319
320
321
322static enum usb_role cdns3_role_get(struct usb_role_switch *sw)
323{
324 struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
325
326 return cdns->role;
327}
328
329
330
331
332
333
334
335
336
337
338static int cdns3_role_set(struct usb_role_switch *sw, enum usb_role role)
339{
340 struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
341 int ret = 0;
342
343 pm_runtime_get_sync(cdns->dev);
344
345 if (cdns->role == role)
346 goto pm_put;
347
348 if (cdns->dr_mode == USB_DR_MODE_HOST) {
349 switch (role) {
350 case USB_ROLE_NONE:
351 case USB_ROLE_HOST:
352 break;
353 default:
354 goto pm_put;
355 }
356 }
357
358 if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {
359 switch (role) {
360 case USB_ROLE_NONE:
361 case USB_ROLE_DEVICE:
362 break;
363 default:
364 goto pm_put;
365 }
366 }
367
368 cdns3_role_stop(cdns);
369 ret = cdns3_role_start(cdns, role);
370 if (ret)
371 dev_err(cdns->dev, "set role %d has failed\n", role);
372
373pm_put:
374 pm_runtime_put_sync(cdns->dev);
375 return ret;
376}
377
378static int set_phy_power_on(struct cdns3 *cdns)
379{
380 int ret;
381
382 ret = phy_power_on(cdns->usb2_phy);
383 if (ret)
384 return ret;
385
386 ret = phy_power_on(cdns->usb3_phy);
387 if (ret)
388 phy_power_off(cdns->usb2_phy);
389
390 return ret;
391}
392
393static void set_phy_power_off(struct cdns3 *cdns)
394{
395 phy_power_off(cdns->usb3_phy);
396 phy_power_off(cdns->usb2_phy);
397}
398
399
400
401
402
403
404
405
406static irqreturn_t cdns3_wakeup_irq(int irq, void *data)
407{
408 struct cdns3 *cdns = data;
409
410 if (cdns->in_lpm) {
411 disable_irq_nosync(irq);
412 cdns->wakeup_pending = true;
413 if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)
414 pm_request_resume(&cdns->host_dev->dev);
415
416 return IRQ_HANDLED;
417 }
418
419 return IRQ_NONE;
420}
421
422
423
424
425
426
427
428static int cdns3_probe(struct platform_device *pdev)
429{
430 struct device *dev = &pdev->dev;
431 struct resource *res;
432 struct cdns3 *cdns;
433 void __iomem *regs;
434 int ret;
435
436 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
437 if (ret) {
438 dev_err(dev, "error setting dma mask: %d\n", ret);
439 return ret;
440 }
441
442 cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
443 if (!cdns)
444 return -ENOMEM;
445
446 cdns->dev = dev;
447 cdns->pdata = dev_get_platdata(dev);
448
449 platform_set_drvdata(pdev, cdns);
450
451 res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
452 if (!res) {
453 dev_err(dev, "missing host IRQ\n");
454 return -ENODEV;
455 }
456
457 cdns->xhci_res[0] = *res;
458
459 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
460 if (!res) {
461 dev_err(dev, "couldn't get xhci resource\n");
462 return -ENXIO;
463 }
464
465 cdns->xhci_res[1] = *res;
466
467 cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
468 if (cdns->dev_irq < 0)
469 return cdns->dev_irq;
470
471 regs = devm_platform_ioremap_resource_byname(pdev, "dev");
472 if (IS_ERR(regs))
473 return PTR_ERR(regs);
474 cdns->dev_regs = regs;
475
476 cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
477 if (cdns->otg_irq < 0)
478 return cdns->otg_irq;
479
480 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
481 if (!res) {
482 dev_err(dev, "couldn't get otg resource\n");
483 return -ENXIO;
484 }
485
486 cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
487
488 cdns->otg_res = *res;
489
490 cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
491 if (cdns->wakeup_irq == -EPROBE_DEFER)
492 return cdns->wakeup_irq;
493 else if (cdns->wakeup_irq == 0)
494 return -EINVAL;
495
496 if (cdns->wakeup_irq < 0) {
497 dev_dbg(dev, "couldn't get wakeup irq\n");
498 cdns->wakeup_irq = 0x0;
499 }
500
501 mutex_init(&cdns->mutex);
502
503 cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
504 if (IS_ERR(cdns->usb2_phy))
505 return PTR_ERR(cdns->usb2_phy);
506
507 ret = phy_init(cdns->usb2_phy);
508 if (ret)
509 return ret;
510
511 cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
512 if (IS_ERR(cdns->usb3_phy))
513 return PTR_ERR(cdns->usb3_phy);
514
515 ret = phy_init(cdns->usb3_phy);
516 if (ret)
517 goto err1;
518
519 ret = set_phy_power_on(cdns);
520 if (ret)
521 goto err2;
522
523 if (device_property_read_bool(dev, "usb-role-switch")) {
524 struct usb_role_switch_desc sw_desc = { };
525
526 sw_desc.set = cdns3_role_set;
527 sw_desc.get = cdns3_role_get;
528 sw_desc.allow_userspace_control = true;
529 sw_desc.driver_data = cdns;
530 sw_desc.fwnode = dev->fwnode;
531
532 cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
533 if (IS_ERR(cdns->role_sw)) {
534 ret = PTR_ERR(cdns->role_sw);
535 dev_warn(dev, "Unable to register Role Switch\n");
536 goto err3;
537 }
538 }
539
540 if (cdns->wakeup_irq) {
541 ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,
542 cdns3_wakeup_irq,
543 IRQF_SHARED,
544 dev_name(cdns->dev), cdns);
545
546 if (ret) {
547 dev_err(cdns->dev, "couldn't register wakeup irq handler\n");
548 goto err4;
549 }
550 }
551
552 ret = cdns3_drd_init(cdns);
553 if (ret)
554 goto err4;
555
556 ret = cdns3_core_init_role(cdns);
557 if (ret)
558 goto err4;
559
560 spin_lock_init(&cdns->lock);
561 device_set_wakeup_capable(dev, true);
562 pm_runtime_set_active(dev);
563 pm_runtime_enable(dev);
564 if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
565 pm_runtime_forbid(dev);
566
567
568
569
570
571
572 pm_runtime_set_autosuspend_delay(dev, 20);
573 pm_runtime_mark_last_busy(dev);
574 pm_runtime_use_autosuspend(dev);
575 dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
576
577 return 0;
578err4:
579 cdns3_drd_exit(cdns);
580 if (cdns->role_sw)
581 usb_role_switch_unregister(cdns->role_sw);
582err3:
583 set_phy_power_off(cdns);
584err2:
585 phy_exit(cdns->usb3_phy);
586err1:
587 phy_exit(cdns->usb2_phy);
588
589 return ret;
590}
591
592
593
594
595
596
597
598static int cdns3_remove(struct platform_device *pdev)
599{
600 struct cdns3 *cdns = platform_get_drvdata(pdev);
601
602 pm_runtime_get_sync(&pdev->dev);
603 pm_runtime_disable(&pdev->dev);
604 pm_runtime_put_noidle(&pdev->dev);
605 cdns3_exit_roles(cdns);
606 usb_role_switch_unregister(cdns->role_sw);
607 set_phy_power_off(cdns);
608 phy_exit(cdns->usb2_phy);
609 phy_exit(cdns->usb3_phy);
610 return 0;
611}
612
613#ifdef CONFIG_PM
614
615static int cdns3_set_platform_suspend(struct device *dev,
616 bool suspend, bool wakeup)
617{
618 struct cdns3 *cdns = dev_get_drvdata(dev);
619 int ret = 0;
620
621 if (cdns->pdata && cdns->pdata->platform_suspend)
622 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
623
624 return ret;
625}
626
627static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
628{
629 struct cdns3 *cdns = dev_get_drvdata(dev);
630 bool wakeup;
631 unsigned long flags;
632
633 if (cdns->in_lpm)
634 return 0;
635
636 if (PMSG_IS_AUTO(msg))
637 wakeup = true;
638 else
639 wakeup = device_may_wakeup(dev);
640
641 cdns3_set_platform_suspend(cdns->dev, true, wakeup);
642 set_phy_power_off(cdns);
643 spin_lock_irqsave(&cdns->lock, flags);
644 cdns->in_lpm = true;
645 spin_unlock_irqrestore(&cdns->lock, flags);
646 dev_dbg(cdns->dev, "%s ends\n", __func__);
647
648 return 0;
649}
650
651static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
652{
653 struct cdns3 *cdns = dev_get_drvdata(dev);
654 int ret;
655 unsigned long flags;
656
657 if (!cdns->in_lpm)
658 return 0;
659
660 ret = set_phy_power_on(cdns);
661 if (ret)
662 return ret;
663
664 cdns3_set_platform_suspend(cdns->dev, false, false);
665
666 spin_lock_irqsave(&cdns->lock, flags);
667 if (cdns->roles[cdns->role]->resume && !PMSG_IS_AUTO(msg))
668 cdns->roles[cdns->role]->resume(cdns, false);
669
670 cdns->in_lpm = false;
671 spin_unlock_irqrestore(&cdns->lock, flags);
672 if (cdns->wakeup_pending) {
673 cdns->wakeup_pending = false;
674 enable_irq(cdns->wakeup_irq);
675 }
676 dev_dbg(cdns->dev, "%s ends\n", __func__);
677
678 return ret;
679}
680
681static int cdns3_runtime_suspend(struct device *dev)
682{
683 return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
684}
685
686static int cdns3_runtime_resume(struct device *dev)
687{
688 return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
689}
690#ifdef CONFIG_PM_SLEEP
691
692static int cdns3_suspend(struct device *dev)
693{
694 struct cdns3 *cdns = dev_get_drvdata(dev);
695 unsigned long flags;
696
697 if (pm_runtime_status_suspended(dev))
698 pm_runtime_resume(dev);
699
700 if (cdns->roles[cdns->role]->suspend) {
701 spin_lock_irqsave(&cdns->lock, flags);
702 cdns->roles[cdns->role]->suspend(cdns, false);
703 spin_unlock_irqrestore(&cdns->lock, flags);
704 }
705
706 return cdns3_controller_suspend(dev, PMSG_SUSPEND);
707}
708
709static int cdns3_resume(struct device *dev)
710{
711 int ret;
712
713 ret = cdns3_controller_resume(dev, PMSG_RESUME);
714 if (ret)
715 return ret;
716
717 pm_runtime_disable(dev);
718 pm_runtime_set_active(dev);
719 pm_runtime_enable(dev);
720
721 return ret;
722}
723#endif
724#endif
725
726static const struct dev_pm_ops cdns3_pm_ops = {
727 SET_SYSTEM_SLEEP_PM_OPS(cdns3_suspend, cdns3_resume)
728 SET_RUNTIME_PM_OPS(cdns3_runtime_suspend, cdns3_runtime_resume, NULL)
729};
730
731#ifdef CONFIG_OF
732static const struct of_device_id of_cdns3_match[] = {
733 { .compatible = "cdns,usb3" },
734 { },
735};
736MODULE_DEVICE_TABLE(of, of_cdns3_match);
737#endif
738
739static struct platform_driver cdns3_driver = {
740 .probe = cdns3_probe,
741 .remove = cdns3_remove,
742 .driver = {
743 .name = "cdns-usb3",
744 .of_match_table = of_match_ptr(of_cdns3_match),
745 .pm = &cdns3_pm_ops,
746 },
747};
748
749module_platform_driver(cdns3_driver);
750
751MODULE_ALIAS("platform:cdns3");
752MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
753MODULE_LICENSE("GPL v2");
754MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
755