1
2
3
4
5
6
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/io.h>
11#include <linux/iopoll.h>
12#include <linux/uaccess.h>
13#include <linux/device.h>
14#include <linux/proc_fs.h>
15#include <linux/clk.h>
16#include <linux/workqueue.h>
17#include <linux/platform_device.h>
18
19#include <linux/usb.h>
20#include <linux/usb/ch9.h>
21#include <linux/usb/otg.h>
22#include <linux/usb/gadget.h>
23#include <linux/usb/hcd.h>
24#include <linux/platform_data/mv_usb.h>
25
26#include "phy-mv-usb.h"
27
28#define DRIVER_DESC "Marvell USB OTG transceiver driver"
29
30MODULE_DESCRIPTION(DRIVER_DESC);
31MODULE_LICENSE("GPL");
32
33static const char driver_name[] = "mv-otg";
34
35static char *state_string[] = {
36 "undefined",
37 "b_idle",
38 "b_srp_init",
39 "b_peripheral",
40 "b_wait_acon",
41 "b_host",
42 "a_idle",
43 "a_wait_vrise",
44 "a_wait_bcon",
45 "a_host",
46 "a_suspend",
47 "a_peripheral",
48 "a_wait_vfall",
49 "a_vbus_err"
50};
51
52static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
53{
54 struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy);
55 if (mvotg->pdata->set_vbus == NULL)
56 return -ENODEV;
57
58 return mvotg->pdata->set_vbus(on);
59}
60
61static int mv_otg_set_host(struct usb_otg *otg,
62 struct usb_bus *host)
63{
64 otg->host = host;
65
66 return 0;
67}
68
69static int mv_otg_set_peripheral(struct usb_otg *otg,
70 struct usb_gadget *gadget)
71{
72 otg->gadget = gadget;
73
74 return 0;
75}
76
77static void mv_otg_run_state_machine(struct mv_otg *mvotg,
78 unsigned long delay)
79{
80 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
81 if (!mvotg->qwork)
82 return;
83
84 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
85}
86
87static void mv_otg_timer_await_bcon(struct timer_list *t)
88{
89 struct mv_otg *mvotg = from_timer(mvotg, t,
90 otg_ctrl.timer[A_WAIT_BCON_TIMER]);
91
92 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
93
94 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
95
96 if (spin_trylock(&mvotg->wq_lock)) {
97 mv_otg_run_state_machine(mvotg, 0);
98 spin_unlock(&mvotg->wq_lock);
99 }
100}
101
102static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
103{
104 struct timer_list *timer;
105
106 if (id >= OTG_TIMER_NUM)
107 return -EINVAL;
108
109 timer = &mvotg->otg_ctrl.timer[id];
110
111 if (timer_pending(timer))
112 del_timer(timer);
113
114 return 0;
115}
116
117static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
118 unsigned long interval)
119{
120 struct timer_list *timer;
121
122 if (id >= OTG_TIMER_NUM)
123 return -EINVAL;
124
125 timer = &mvotg->otg_ctrl.timer[id];
126 if (timer_pending(timer)) {
127 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
128 return -EBUSY;
129 }
130
131 timer->expires = jiffies + interval;
132 add_timer(timer);
133
134 return 0;
135}
136
137static int mv_otg_reset(struct mv_otg *mvotg)
138{
139 u32 tmp;
140 int ret;
141
142
143 tmp = readl(&mvotg->op_regs->usbcmd);
144 tmp &= ~USBCMD_RUN_STOP;
145 writel(tmp, &mvotg->op_regs->usbcmd);
146
147
148 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
149
150 ret = readl_poll_timeout_atomic(&mvotg->op_regs->usbcmd, tmp,
151 (tmp & USBCMD_CTRL_RESET), 10, 10000);
152 if (ret < 0) {
153 dev_err(&mvotg->pdev->dev,
154 "Wait for RESET completed TIMEOUT\n");
155 return ret;
156 }
157
158 writel(0x0, &mvotg->op_regs->usbintr);
159 tmp = readl(&mvotg->op_regs->usbsts);
160 writel(tmp, &mvotg->op_regs->usbsts);
161
162 return 0;
163}
164
165static void mv_otg_init_irq(struct mv_otg *mvotg)
166{
167 u32 otgsc;
168
169 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
170 | OTGSC_INTR_A_VBUS_VALID;
171 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
172 | OTGSC_INTSTS_A_VBUS_VALID;
173
174 if (mvotg->pdata->vbus == NULL) {
175 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
176 | OTGSC_INTR_B_SESSION_END;
177 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
178 | OTGSC_INTSTS_B_SESSION_END;
179 }
180
181 if (mvotg->pdata->id == NULL) {
182 mvotg->irq_en |= OTGSC_INTR_USB_ID;
183 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
184 }
185
186 otgsc = readl(&mvotg->op_regs->otgsc);
187 otgsc |= mvotg->irq_en;
188 writel(otgsc, &mvotg->op_regs->otgsc);
189}
190
191static void mv_otg_start_host(struct mv_otg *mvotg, int on)
192{
193#ifdef CONFIG_USB
194 struct usb_otg *otg = mvotg->phy.otg;
195 struct usb_hcd *hcd;
196
197 if (!otg->host)
198 return;
199
200 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
201
202 hcd = bus_to_hcd(otg->host);
203
204 if (on) {
205 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
206 device_wakeup_enable(hcd->self.controller);
207 } else {
208 usb_remove_hcd(hcd);
209 }
210#endif
211}
212
213static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
214{
215 struct usb_otg *otg = mvotg->phy.otg;
216
217 if (!otg->gadget)
218 return;
219
220 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
221
222 if (on)
223 usb_gadget_vbus_connect(otg->gadget);
224 else
225 usb_gadget_vbus_disconnect(otg->gadget);
226}
227
228static void otg_clock_enable(struct mv_otg *mvotg)
229{
230 clk_prepare_enable(mvotg->clk);
231}
232
233static void otg_clock_disable(struct mv_otg *mvotg)
234{
235 clk_disable_unprepare(mvotg->clk);
236}
237
238static int mv_otg_enable_internal(struct mv_otg *mvotg)
239{
240 int retval = 0;
241
242 if (mvotg->active)
243 return 0;
244
245 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
246
247 otg_clock_enable(mvotg);
248 if (mvotg->pdata->phy_init) {
249 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
250 if (retval) {
251 dev_err(&mvotg->pdev->dev,
252 "init phy error %d\n", retval);
253 otg_clock_disable(mvotg);
254 return retval;
255 }
256 }
257 mvotg->active = 1;
258
259 return 0;
260
261}
262
263static int mv_otg_enable(struct mv_otg *mvotg)
264{
265 if (mvotg->clock_gating)
266 return mv_otg_enable_internal(mvotg);
267
268 return 0;
269}
270
271static void mv_otg_disable_internal(struct mv_otg *mvotg)
272{
273 if (mvotg->active) {
274 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
275 if (mvotg->pdata->phy_deinit)
276 mvotg->pdata->phy_deinit(mvotg->phy_regs);
277 otg_clock_disable(mvotg);
278 mvotg->active = 0;
279 }
280}
281
282static void mv_otg_disable(struct mv_otg *mvotg)
283{
284 if (mvotg->clock_gating)
285 mv_otg_disable_internal(mvotg);
286}
287
288static void mv_otg_update_inputs(struct mv_otg *mvotg)
289{
290 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
291 u32 otgsc;
292
293 otgsc = readl(&mvotg->op_regs->otgsc);
294
295 if (mvotg->pdata->vbus) {
296 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
297 otg_ctrl->b_sess_vld = 1;
298 otg_ctrl->b_sess_end = 0;
299 } else {
300 otg_ctrl->b_sess_vld = 0;
301 otg_ctrl->b_sess_end = 1;
302 }
303 } else {
304 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
305 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
306 }
307
308 if (mvotg->pdata->id)
309 otg_ctrl->id = !!mvotg->pdata->id->poll();
310 else
311 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
312
313 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
314 otg_ctrl->a_bus_req = 1;
315
316 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
317 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
318
319 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
320 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
321 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
322 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
323 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
324 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
325}
326
327static void mv_otg_update_state(struct mv_otg *mvotg)
328{
329 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
330 int old_state = mvotg->phy.otg->state;
331
332 switch (old_state) {
333 case OTG_STATE_UNDEFINED:
334 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
335 fallthrough;
336 case OTG_STATE_B_IDLE:
337 if (otg_ctrl->id == 0)
338 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
339 else if (otg_ctrl->b_sess_vld)
340 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
341 break;
342 case OTG_STATE_B_PERIPHERAL:
343 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
344 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
345 break;
346 case OTG_STATE_A_IDLE:
347 if (otg_ctrl->id)
348 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
349 else if (!(otg_ctrl->a_bus_drop) &&
350 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
351 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
352 break;
353 case OTG_STATE_A_WAIT_VRISE:
354 if (otg_ctrl->a_vbus_vld)
355 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
356 break;
357 case OTG_STATE_A_WAIT_BCON:
358 if (otg_ctrl->id || otg_ctrl->a_bus_drop
359 || otg_ctrl->a_wait_bcon_timeout) {
360 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
361 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
362 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
363 otg_ctrl->a_bus_req = 0;
364 } else if (!otg_ctrl->a_vbus_vld) {
365 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
366 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
367 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
368 } else if (otg_ctrl->b_conn) {
369 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
370 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
371 mvotg->phy.otg->state = OTG_STATE_A_HOST;
372 }
373 break;
374 case OTG_STATE_A_HOST:
375 if (otg_ctrl->id || !otg_ctrl->b_conn
376 || otg_ctrl->a_bus_drop)
377 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
378 else if (!otg_ctrl->a_vbus_vld)
379 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
380 break;
381 case OTG_STATE_A_WAIT_VFALL:
382 if (otg_ctrl->id
383 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
384 || otg_ctrl->a_bus_req)
385 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
386 break;
387 case OTG_STATE_A_VBUS_ERR:
388 if (otg_ctrl->id || otg_ctrl->a_clr_err
389 || otg_ctrl->a_bus_drop) {
390 otg_ctrl->a_clr_err = 0;
391 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
392 }
393 break;
394 default:
395 break;
396 }
397}
398
399static void mv_otg_work(struct work_struct *work)
400{
401 struct mv_otg *mvotg;
402 struct usb_otg *otg;
403 int old_state;
404
405 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
406
407run:
408
409 otg = mvotg->phy.otg;
410 old_state = otg->state;
411
412 if (!mvotg->active)
413 return;
414
415 mv_otg_update_inputs(mvotg);
416 mv_otg_update_state(mvotg);
417
418 if (old_state != mvotg->phy.otg->state) {
419 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
420 state_string[old_state],
421 state_string[mvotg->phy.otg->state]);
422
423 switch (mvotg->phy.otg->state) {
424 case OTG_STATE_B_IDLE:
425 otg->default_a = 0;
426 if (old_state == OTG_STATE_B_PERIPHERAL)
427 mv_otg_start_periphrals(mvotg, 0);
428 mv_otg_reset(mvotg);
429 mv_otg_disable(mvotg);
430 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
431 break;
432 case OTG_STATE_B_PERIPHERAL:
433 mv_otg_enable(mvotg);
434 mv_otg_start_periphrals(mvotg, 1);
435 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
436 break;
437 case OTG_STATE_A_IDLE:
438 otg->default_a = 1;
439 mv_otg_enable(mvotg);
440 if (old_state == OTG_STATE_A_WAIT_VFALL)
441 mv_otg_start_host(mvotg, 0);
442 mv_otg_reset(mvotg);
443 break;
444 case OTG_STATE_A_WAIT_VRISE:
445 mv_otg_set_vbus(otg, 1);
446 break;
447 case OTG_STATE_A_WAIT_BCON:
448 if (old_state != OTG_STATE_A_HOST)
449 mv_otg_start_host(mvotg, 1);
450 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
451 T_A_WAIT_BCON);
452
453
454
455
456 mvotg->otg_ctrl.b_conn = 1;
457 break;
458 case OTG_STATE_A_HOST:
459 break;
460 case OTG_STATE_A_WAIT_VFALL:
461
462
463
464
465 mvotg->otg_ctrl.b_conn = 0;
466 mv_otg_set_vbus(otg, 0);
467 break;
468 case OTG_STATE_A_VBUS_ERR:
469 break;
470 default:
471 break;
472 }
473 goto run;
474 }
475}
476
477static irqreturn_t mv_otg_irq(int irq, void *dev)
478{
479 struct mv_otg *mvotg = dev;
480 u32 otgsc;
481
482 otgsc = readl(&mvotg->op_regs->otgsc);
483 writel(otgsc, &mvotg->op_regs->otgsc);
484
485
486
487
488
489 if (mvotg->pdata->vbus)
490 if ((otgsc & OTGSC_STS_USB_ID) &&
491 !(otgsc & OTGSC_INTSTS_USB_ID))
492 return IRQ_NONE;
493
494 if ((otgsc & mvotg->irq_status) == 0)
495 return IRQ_NONE;
496
497 mv_otg_run_state_machine(mvotg, 0);
498
499 return IRQ_HANDLED;
500}
501
502static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
503{
504 struct mv_otg *mvotg = dev;
505
506
507 if (!mvotg->active) {
508 mv_otg_enable(mvotg);
509 mv_otg_init_irq(mvotg);
510 }
511
512 mv_otg_run_state_machine(mvotg, 0);
513
514 return IRQ_HANDLED;
515}
516
517static ssize_t
518a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf)
519{
520 struct mv_otg *mvotg = dev_get_drvdata(dev);
521 return scnprintf(buf, PAGE_SIZE, "%d\n",
522 mvotg->otg_ctrl.a_bus_req);
523}
524
525static ssize_t
526a_bus_req_store(struct device *dev, struct device_attribute *attr,
527 const char *buf, size_t count)
528{
529 struct mv_otg *mvotg = dev_get_drvdata(dev);
530
531 if (count > 2)
532 return -1;
533
534
535 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
536 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
537 return -1;
538
539
540 mv_otg_enable(mvotg);
541 mv_otg_init_irq(mvotg);
542
543 if (buf[0] == '1') {
544 mvotg->otg_ctrl.a_bus_req = 1;
545 mvotg->otg_ctrl.a_bus_drop = 0;
546 dev_dbg(&mvotg->pdev->dev,
547 "User request: a_bus_req = 1\n");
548
549 if (spin_trylock(&mvotg->wq_lock)) {
550 mv_otg_run_state_machine(mvotg, 0);
551 spin_unlock(&mvotg->wq_lock);
552 }
553 }
554
555 return count;
556}
557
558static DEVICE_ATTR_RW(a_bus_req);
559
560static ssize_t
561a_clr_err_store(struct device *dev, struct device_attribute *attr,
562 const char *buf, size_t count)
563{
564 struct mv_otg *mvotg = dev_get_drvdata(dev);
565 if (!mvotg->phy.otg->default_a)
566 return -1;
567
568 if (count > 2)
569 return -1;
570
571 if (buf[0] == '1') {
572 mvotg->otg_ctrl.a_clr_err = 1;
573 dev_dbg(&mvotg->pdev->dev,
574 "User request: a_clr_err = 1\n");
575 }
576
577 if (spin_trylock(&mvotg->wq_lock)) {
578 mv_otg_run_state_machine(mvotg, 0);
579 spin_unlock(&mvotg->wq_lock);
580 }
581
582 return count;
583}
584
585static DEVICE_ATTR_WO(a_clr_err);
586
587static ssize_t
588a_bus_drop_show(struct device *dev, struct device_attribute *attr,
589 char *buf)
590{
591 struct mv_otg *mvotg = dev_get_drvdata(dev);
592 return scnprintf(buf, PAGE_SIZE, "%d\n",
593 mvotg->otg_ctrl.a_bus_drop);
594}
595
596static ssize_t
597a_bus_drop_store(struct device *dev, struct device_attribute *attr,
598 const char *buf, size_t count)
599{
600 struct mv_otg *mvotg = dev_get_drvdata(dev);
601 if (!mvotg->phy.otg->default_a)
602 return -1;
603
604 if (count > 2)
605 return -1;
606
607 if (buf[0] == '0') {
608 mvotg->otg_ctrl.a_bus_drop = 0;
609 dev_dbg(&mvotg->pdev->dev,
610 "User request: a_bus_drop = 0\n");
611 } else if (buf[0] == '1') {
612 mvotg->otg_ctrl.a_bus_drop = 1;
613 mvotg->otg_ctrl.a_bus_req = 0;
614 dev_dbg(&mvotg->pdev->dev,
615 "User request: a_bus_drop = 1\n");
616 dev_dbg(&mvotg->pdev->dev,
617 "User request: and a_bus_req = 0\n");
618 }
619
620 if (spin_trylock(&mvotg->wq_lock)) {
621 mv_otg_run_state_machine(mvotg, 0);
622 spin_unlock(&mvotg->wq_lock);
623 }
624
625 return count;
626}
627
628static DEVICE_ATTR_RW(a_bus_drop);
629
630static struct attribute *inputs_attrs[] = {
631 &dev_attr_a_bus_req.attr,
632 &dev_attr_a_clr_err.attr,
633 &dev_attr_a_bus_drop.attr,
634 NULL,
635};
636
637static const struct attribute_group inputs_attr_group = {
638 .name = "inputs",
639 .attrs = inputs_attrs,
640};
641
642static const struct attribute_group *mv_otg_groups[] = {
643 &inputs_attr_group,
644 NULL,
645};
646
647static int mv_otg_remove(struct platform_device *pdev)
648{
649 struct mv_otg *mvotg = platform_get_drvdata(pdev);
650
651 if (mvotg->qwork) {
652 flush_workqueue(mvotg->qwork);
653 destroy_workqueue(mvotg->qwork);
654 }
655
656 mv_otg_disable(mvotg);
657
658 usb_remove_phy(&mvotg->phy);
659
660 return 0;
661}
662
663static int mv_otg_probe(struct platform_device *pdev)
664{
665 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
666 struct mv_otg *mvotg;
667 struct usb_otg *otg;
668 struct resource *r;
669 int retval = 0, i;
670
671 if (pdata == NULL) {
672 dev_err(&pdev->dev, "failed to get platform data\n");
673 return -ENODEV;
674 }
675
676 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
677 if (!mvotg)
678 return -ENOMEM;
679
680 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
681 if (!otg)
682 return -ENOMEM;
683
684 platform_set_drvdata(pdev, mvotg);
685
686 mvotg->pdev = pdev;
687 mvotg->pdata = pdata;
688
689 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
690 if (IS_ERR(mvotg->clk))
691 return PTR_ERR(mvotg->clk);
692
693 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
694 if (!mvotg->qwork) {
695 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
696 return -ENOMEM;
697 }
698
699 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
700
701
702 mvotg->pdev = pdev;
703 mvotg->phy.dev = &pdev->dev;
704 mvotg->phy.otg = otg;
705 mvotg->phy.label = driver_name;
706
707 otg->state = OTG_STATE_UNDEFINED;
708 otg->usb_phy = &mvotg->phy;
709 otg->set_host = mv_otg_set_host;
710 otg->set_peripheral = mv_otg_set_peripheral;
711 otg->set_vbus = mv_otg_set_vbus;
712
713 for (i = 0; i < OTG_TIMER_NUM; i++)
714 timer_setup(&mvotg->otg_ctrl.timer[i],
715 mv_otg_timer_await_bcon, 0);
716
717 r = platform_get_resource_byname(mvotg->pdev,
718 IORESOURCE_MEM, "phyregs");
719 if (r == NULL) {
720 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
721 retval = -ENODEV;
722 goto err_destroy_workqueue;
723 }
724
725 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
726 if (mvotg->phy_regs == NULL) {
727 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
728 retval = -EFAULT;
729 goto err_destroy_workqueue;
730 }
731
732 r = platform_get_resource_byname(mvotg->pdev,
733 IORESOURCE_MEM, "capregs");
734 if (r == NULL) {
735 dev_err(&pdev->dev, "no I/O memory resource defined\n");
736 retval = -ENODEV;
737 goto err_destroy_workqueue;
738 }
739
740 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
741 if (mvotg->cap_regs == NULL) {
742 dev_err(&pdev->dev, "failed to map I/O memory\n");
743 retval = -EFAULT;
744 goto err_destroy_workqueue;
745 }
746
747
748 retval = mv_otg_enable_internal(mvotg);
749 if (retval) {
750 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
751 goto err_destroy_workqueue;
752 }
753
754 mvotg->op_regs =
755 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
756 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
757
758 if (pdata->id) {
759 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
760 NULL, mv_otg_inputs_irq,
761 IRQF_ONESHOT, "id", mvotg);
762 if (retval) {
763 dev_info(&pdev->dev,
764 "Failed to request irq for ID\n");
765 pdata->id = NULL;
766 }
767 }
768
769 if (pdata->vbus) {
770 mvotg->clock_gating = 1;
771 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
772 NULL, mv_otg_inputs_irq,
773 IRQF_ONESHOT, "vbus", mvotg);
774 if (retval) {
775 dev_info(&pdev->dev,
776 "Failed to request irq for VBUS, "
777 "disable clock gating\n");
778 mvotg->clock_gating = 0;
779 pdata->vbus = NULL;
780 }
781 }
782
783 if (pdata->disable_otg_clock_gating)
784 mvotg->clock_gating = 0;
785
786 mv_otg_reset(mvotg);
787 mv_otg_init_irq(mvotg);
788
789 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
790 if (r == NULL) {
791 dev_err(&pdev->dev, "no IRQ resource defined\n");
792 retval = -ENODEV;
793 goto err_disable_clk;
794 }
795
796 mvotg->irq = r->start;
797 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
798 driver_name, mvotg)) {
799 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
800 mvotg->irq);
801 mvotg->irq = 0;
802 retval = -ENODEV;
803 goto err_disable_clk;
804 }
805
806 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
807 if (retval < 0) {
808 dev_err(&pdev->dev, "can't register transceiver, %d\n",
809 retval);
810 goto err_disable_clk;
811 }
812
813 spin_lock_init(&mvotg->wq_lock);
814 if (spin_trylock(&mvotg->wq_lock)) {
815 mv_otg_run_state_machine(mvotg, 2 * HZ);
816 spin_unlock(&mvotg->wq_lock);
817 }
818
819 dev_info(&pdev->dev,
820 "successful probe OTG device %s clock gating.\n",
821 mvotg->clock_gating ? "with" : "without");
822
823 return 0;
824
825err_disable_clk:
826 mv_otg_disable_internal(mvotg);
827err_destroy_workqueue:
828 flush_workqueue(mvotg->qwork);
829 destroy_workqueue(mvotg->qwork);
830
831 return retval;
832}
833
834#ifdef CONFIG_PM
835static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
836{
837 struct mv_otg *mvotg = platform_get_drvdata(pdev);
838
839 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
840 dev_info(&pdev->dev,
841 "OTG state is not B_IDLE, it is %d!\n",
842 mvotg->phy.otg->state);
843 return -EAGAIN;
844 }
845
846 if (!mvotg->clock_gating)
847 mv_otg_disable_internal(mvotg);
848
849 return 0;
850}
851
852static int mv_otg_resume(struct platform_device *pdev)
853{
854 struct mv_otg *mvotg = platform_get_drvdata(pdev);
855 u32 otgsc;
856
857 if (!mvotg->clock_gating) {
858 mv_otg_enable_internal(mvotg);
859
860 otgsc = readl(&mvotg->op_regs->otgsc);
861 otgsc |= mvotg->irq_en;
862 writel(otgsc, &mvotg->op_regs->otgsc);
863
864 if (spin_trylock(&mvotg->wq_lock)) {
865 mv_otg_run_state_machine(mvotg, 0);
866 spin_unlock(&mvotg->wq_lock);
867 }
868 }
869 return 0;
870}
871#endif
872
873static struct platform_driver mv_otg_driver = {
874 .probe = mv_otg_probe,
875 .remove = mv_otg_remove,
876 .driver = {
877 .name = driver_name,
878 .dev_groups = mv_otg_groups,
879 },
880#ifdef CONFIG_PM
881 .suspend = mv_otg_suspend,
882 .resume = mv_otg_resume,
883#endif
884};
885module_platform_driver(mv_otg_driver);
886
