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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
4 * Author: Chao Xie <chao.xie@marvell.com>
5 * Neil Zhang <zhangwm@marvell.com>
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/io.h>
11#include <linux/uaccess.h>
12#include <linux/device.h>
13#include <linux/proc_fs.h>
14#include <linux/clk.h>
15#include <linux/workqueue.h>
16#include <linux/platform_device.h>
17
18#include <linux/usb.h>
19#include <linux/usb/ch9.h>
20#include <linux/usb/otg.h>
21#include <linux/usb/gadget.h>
22#include <linux/usb/hcd.h>
23#include <linux/platform_data/mv_usb.h>
24
25#include "phy-mv-usb.h"
26
27#define DRIVER_DESC "Marvell USB OTG transceiver driver"
28
29MODULE_DESCRIPTION(DRIVER_DESC);
30MODULE_LICENSE("GPL");
31
32static const char driver_name[] = "mv-otg";
33
34static char *state_string[] = {
35 "undefined",
36 "b_idle",
37 "b_srp_init",
38 "b_peripheral",
39 "b_wait_acon",
40 "b_host",
41 "a_idle",
42 "a_wait_vrise",
43 "a_wait_bcon",
44 "a_host",
45 "a_suspend",
46 "a_peripheral",
47 "a_wait_vfall",
48 "a_vbus_err"
49};
50
51static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
52{
53 struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy);
54 if (mvotg->pdata->set_vbus == NULL)
55 return -ENODEV;
56
57 return mvotg->pdata->set_vbus(on);
58}
59
60static int mv_otg_set_host(struct usb_otg *otg,
61 struct usb_bus *host)
62{
63 otg->host = host;
64
65 return 0;
66}
67
68static int mv_otg_set_peripheral(struct usb_otg *otg,
69 struct usb_gadget *gadget)
70{
71 otg->gadget = gadget;
72
73 return 0;
74}
75
76static void mv_otg_run_state_machine(struct mv_otg *mvotg,
77 unsigned long delay)
78{
79 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
80 if (!mvotg->qwork)
81 return;
82
83 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
84}
85
86static void mv_otg_timer_await_bcon(struct timer_list *t)
87{
88 struct mv_otg *mvotg = from_timer(mvotg, t,
89 otg_ctrl.timer[A_WAIT_BCON_TIMER]);
90
91 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
92
93 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
94
95 if (spin_trylock(&mvotg->wq_lock)) {
96 mv_otg_run_state_machine(mvotg, 0);
97 spin_unlock(&mvotg->wq_lock);
98 }
99}
100
101static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
102{
103 struct timer_list *timer;
104
105 if (id >= OTG_TIMER_NUM)
106 return -EINVAL;
107
108 timer = &mvotg->otg_ctrl.timer[id];
109
110 if (timer_pending(timer))
111 del_timer(timer);
112
113 return 0;
114}
115
116static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
117 unsigned long interval)
118{
119 struct timer_list *timer;
120
121 if (id >= OTG_TIMER_NUM)
122 return -EINVAL;
123
124 timer = &mvotg->otg_ctrl.timer[id];
125 if (timer_pending(timer)) {
126 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
127 return -EBUSY;
128 }
129
130 timer->expires = jiffies + interval;
131 add_timer(timer);
132
133 return 0;
134}
135
136static int mv_otg_reset(struct mv_otg *mvotg)
137{
138 unsigned int loops;
139 u32 tmp;
140
141 /* Stop the controller */
142 tmp = readl(&mvotg->op_regs->usbcmd);
143 tmp &= ~USBCMD_RUN_STOP;
144 writel(tmp, &mvotg->op_regs->usbcmd);
145
146 /* Reset the controller to get default values */
147 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
148
149 loops = 500;
150 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
151 if (loops == 0) {
152 dev_err(&mvotg->pdev->dev,
153 "Wait for RESET completed TIMEOUT\n");
154 return -ETIMEDOUT;
155 }
156 loops--;
157 udelay(20);
158 }
159
160 writel(0x0, &mvotg->op_regs->usbintr);
161 tmp = readl(&mvotg->op_regs->usbsts);
162 writel(tmp, &mvotg->op_regs->usbsts);
163
164 return 0;
165}
166
167static void mv_otg_init_irq(struct mv_otg *mvotg)
168{
169 u32 otgsc;
170
171 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
172 | OTGSC_INTR_A_VBUS_VALID;
173 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
174 | OTGSC_INTSTS_A_VBUS_VALID;
175
176 if (mvotg->pdata->vbus == NULL) {
177 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
178 | OTGSC_INTR_B_SESSION_END;
179 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
180 | OTGSC_INTSTS_B_SESSION_END;
181 }
182
183 if (mvotg->pdata->id == NULL) {
184 mvotg->irq_en |= OTGSC_INTR_USB_ID;
185 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
186 }
187
188 otgsc = readl(&mvotg->op_regs->otgsc);
189 otgsc |= mvotg->irq_en;
190 writel(otgsc, &mvotg->op_regs->otgsc);
191}
192
193static void mv_otg_start_host(struct mv_otg *mvotg, int on)
194{
195#ifdef CONFIG_USB
196 struct usb_otg *otg = mvotg->phy.otg;
197 struct usb_hcd *hcd;
198
199 if (!otg->host)
200 return;
201
202 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
203
204 hcd = bus_to_hcd(otg->host);
205
206 if (on) {
207 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
208 device_wakeup_enable(hcd->self.controller);
209 } else {
210 usb_remove_hcd(hcd);
211 }
212#endif /* CONFIG_USB */
213}
214
215static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
216{
217 struct usb_otg *otg = mvotg->phy.otg;
218
219 if (!otg->gadget)
220 return;
221
222 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
223
224 if (on)
225 usb_gadget_vbus_connect(otg->gadget);
226 else
227 usb_gadget_vbus_disconnect(otg->gadget);
228}
229
230static void otg_clock_enable(struct mv_otg *mvotg)
231{
232 clk_prepare_enable(mvotg->clk);
233}
234
235static void otg_clock_disable(struct mv_otg *mvotg)
236{
237 clk_disable_unprepare(mvotg->clk);
238}
239
240static int mv_otg_enable_internal(struct mv_otg *mvotg)
241{
242 int retval = 0;
243
244 if (mvotg->active)
245 return 0;
246
247 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
248
249 otg_clock_enable(mvotg);
250 if (mvotg->pdata->phy_init) {
251 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
252 if (retval) {
253 dev_err(&mvotg->pdev->dev,
254 "init phy error %d\n", retval);
255 otg_clock_disable(mvotg);
256 return retval;
257 }
258 }
259 mvotg->active = 1;
260
261 return 0;
262
263}
264
265static int mv_otg_enable(struct mv_otg *mvotg)
266{
267 if (mvotg->clock_gating)
268 return mv_otg_enable_internal(mvotg);
269
270 return 0;
271}
272
273static void mv_otg_disable_internal(struct mv_otg *mvotg)
274{
275 if (mvotg->active) {
276 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
277 if (mvotg->pdata->phy_deinit)
278 mvotg->pdata->phy_deinit(mvotg->phy_regs);
279 otg_clock_disable(mvotg);
280 mvotg->active = 0;
281 }
282}
283
284static void mv_otg_disable(struct mv_otg *mvotg)
285{
286 if (mvotg->clock_gating)
287 mv_otg_disable_internal(mvotg);
288}
289
290static void mv_otg_update_inputs(struct mv_otg *mvotg)
291{
292 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
293 u32 otgsc;
294
295 otgsc = readl(&mvotg->op_regs->otgsc);
296
297 if (mvotg->pdata->vbus) {
298 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
299 otg_ctrl->b_sess_vld = 1;
300 otg_ctrl->b_sess_end = 0;
301 } else {
302 otg_ctrl->b_sess_vld = 0;
303 otg_ctrl->b_sess_end = 1;
304 }
305 } else {
306 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
307 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
308 }
309
310 if (mvotg->pdata->id)
311 otg_ctrl->id = !!mvotg->pdata->id->poll();
312 else
313 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
314
315 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
316 otg_ctrl->a_bus_req = 1;
317
318 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
319 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
320
321 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
322 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
323 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
324 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
325 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
326 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
327}
328
329static void mv_otg_update_state(struct mv_otg *mvotg)
330{
331 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
332 int old_state = mvotg->phy.otg->state;
333
334 switch (old_state) {
335 case OTG_STATE_UNDEFINED:
336 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
337 fallthrough;
338 case OTG_STATE_B_IDLE:
339 if (otg_ctrl->id == 0)
340 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
341 else if (otg_ctrl->b_sess_vld)
342 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
343 break;
344 case OTG_STATE_B_PERIPHERAL:
345 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
346 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
347 break;
348 case OTG_STATE_A_IDLE:
349 if (otg_ctrl->id)
350 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
351 else if (!(otg_ctrl->a_bus_drop) &&
352 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
353 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
354 break;
355 case OTG_STATE_A_WAIT_VRISE:
356 if (otg_ctrl->a_vbus_vld)
357 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
358 break;
359 case OTG_STATE_A_WAIT_BCON:
360 if (otg_ctrl->id || otg_ctrl->a_bus_drop
361 || otg_ctrl->a_wait_bcon_timeout) {
362 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
363 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
364 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
365 otg_ctrl->a_bus_req = 0;
366 } else if (!otg_ctrl->a_vbus_vld) {
367 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
368 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
369 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
370 } else if (otg_ctrl->b_conn) {
371 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
372 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
373 mvotg->phy.otg->state = OTG_STATE_A_HOST;
374 }
375 break;
376 case OTG_STATE_A_HOST:
377 if (otg_ctrl->id || !otg_ctrl->b_conn
378 || otg_ctrl->a_bus_drop)
379 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
380 else if (!otg_ctrl->a_vbus_vld)
381 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
382 break;
383 case OTG_STATE_A_WAIT_VFALL:
384 if (otg_ctrl->id
385 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
386 || otg_ctrl->a_bus_req)
387 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
388 break;
389 case OTG_STATE_A_VBUS_ERR:
390 if (otg_ctrl->id || otg_ctrl->a_clr_err
391 || otg_ctrl->a_bus_drop) {
392 otg_ctrl->a_clr_err = 0;
393 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
394 }
395 break;
396 default:
397 break;
398 }
399}
400
401static void mv_otg_work(struct work_struct *work)
402{
403 struct mv_otg *mvotg;
404 struct usb_otg *otg;
405 int old_state;
406
407 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
408
409run:
410 /* work queue is single thread, or we need spin_lock to protect */
411 otg = mvotg->phy.otg;
412 old_state = otg->state;
413
414 if (!mvotg->active)
415 return;
416
417 mv_otg_update_inputs(mvotg);
418 mv_otg_update_state(mvotg);
419
420 if (old_state != mvotg->phy.otg->state) {
421 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
422 state_string[old_state],
423 state_string[mvotg->phy.otg->state]);
424
425 switch (mvotg->phy.otg->state) {
426 case OTG_STATE_B_IDLE:
427 otg->default_a = 0;
428 if (old_state == OTG_STATE_B_PERIPHERAL)
429 mv_otg_start_periphrals(mvotg, 0);
430 mv_otg_reset(mvotg);
431 mv_otg_disable(mvotg);
432 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
433 break;
434 case OTG_STATE_B_PERIPHERAL:
435 mv_otg_enable(mvotg);
436 mv_otg_start_periphrals(mvotg, 1);
437 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
438 break;
439 case OTG_STATE_A_IDLE:
440 otg->default_a = 1;
441 mv_otg_enable(mvotg);
442 if (old_state == OTG_STATE_A_WAIT_VFALL)
443 mv_otg_start_host(mvotg, 0);
444 mv_otg_reset(mvotg);
445 break;
446 case OTG_STATE_A_WAIT_VRISE:
447 mv_otg_set_vbus(otg, 1);
448 break;
449 case OTG_STATE_A_WAIT_BCON:
450 if (old_state != OTG_STATE_A_HOST)
451 mv_otg_start_host(mvotg, 1);
452 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
453 T_A_WAIT_BCON);
454 /*
455 * Now, we directly enter A_HOST. So set b_conn = 1
456 * here. In fact, it need host driver to notify us.
457 */
458 mvotg->otg_ctrl.b_conn = 1;
459 break;
460 case OTG_STATE_A_HOST:
461 break;
462 case OTG_STATE_A_WAIT_VFALL:
463 /*
464 * Now, we has exited A_HOST. So set b_conn = 0
465 * here. In fact, it need host driver to notify us.
466 */
467 mvotg->otg_ctrl.b_conn = 0;
468 mv_otg_set_vbus(otg, 0);
469 break;
470 case OTG_STATE_A_VBUS_ERR:
471 break;
472 default:
473 break;
474 }
475 goto run;
476 }
477}
478
479static irqreturn_t mv_otg_irq(int irq, void *dev)
480{
481 struct mv_otg *mvotg = dev;
482 u32 otgsc;
483
484 otgsc = readl(&mvotg->op_regs->otgsc);
485 writel(otgsc, &mvotg->op_regs->otgsc);
486
487 /*
488 * if we have vbus, then the vbus detection for B-device
489 * will be done by mv_otg_inputs_irq().
490 */
491 if (mvotg->pdata->vbus)
492 if ((otgsc & OTGSC_STS_USB_ID) &&
493 !(otgsc & OTGSC_INTSTS_USB_ID))
494 return IRQ_NONE;
495
496 if ((otgsc & mvotg->irq_status) == 0)
497 return IRQ_NONE;
498
499 mv_otg_run_state_machine(mvotg, 0);
500
501 return IRQ_HANDLED;
502}
503
504static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
505{
506 struct mv_otg *mvotg = dev;
507
508 /* The clock may disabled at this time */
509 if (!mvotg->active) {
510 mv_otg_enable(mvotg);
511 mv_otg_init_irq(mvotg);
512 }
513
514 mv_otg_run_state_machine(mvotg, 0);
515
516 return IRQ_HANDLED;
517}
518
519static ssize_t
520a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf)
521{
522 struct mv_otg *mvotg = dev_get_drvdata(dev);
523 return scnprintf(buf, PAGE_SIZE, "%d\n",
524 mvotg->otg_ctrl.a_bus_req);
525}
526
527static ssize_t
528a_bus_req_store(struct device *dev, struct device_attribute *attr,
529 const char *buf, size_t count)
530{
531 struct mv_otg *mvotg = dev_get_drvdata(dev);
532
533 if (count > 2)
534 return -1;
535
536 /* We will use this interface to change to A device */
537 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
538 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
539 return -1;
540
541 /* The clock may disabled and we need to set irq for ID detected */
542 mv_otg_enable(mvotg);
543 mv_otg_init_irq(mvotg);
544
545 if (buf[0] == '1') {
546 mvotg->otg_ctrl.a_bus_req = 1;
547 mvotg->otg_ctrl.a_bus_drop = 0;
548 dev_dbg(&mvotg->pdev->dev,
549 "User request: a_bus_req = 1\n");
550
551 if (spin_trylock(&mvotg->wq_lock)) {
552 mv_otg_run_state_machine(mvotg, 0);
553 spin_unlock(&mvotg->wq_lock);
554 }
555 }
556
557 return count;
558}
559
560static DEVICE_ATTR_RW(a_bus_req);
561
562static ssize_t
563a_clr_err_store(struct device *dev, struct device_attribute *attr,
564 const char *buf, size_t count)
565{
566 struct mv_otg *mvotg = dev_get_drvdata(dev);
567 if (!mvotg->phy.otg->default_a)
568 return -1;
569
570 if (count > 2)
571 return -1;
572
573 if (buf[0] == '1') {
574 mvotg->otg_ctrl.a_clr_err = 1;
575 dev_dbg(&mvotg->pdev->dev,
576 "User request: a_clr_err = 1\n");
577 }
578
579 if (spin_trylock(&mvotg->wq_lock)) {
580 mv_otg_run_state_machine(mvotg, 0);
581 spin_unlock(&mvotg->wq_lock);
582 }
583
584 return count;
585}
586
587static DEVICE_ATTR_WO(a_clr_err);
588
589static ssize_t
590a_bus_drop_show(struct device *dev, struct device_attribute *attr,
591 char *buf)
592{
593 struct mv_otg *mvotg = dev_get_drvdata(dev);
594 return scnprintf(buf, PAGE_SIZE, "%d\n",
595 mvotg->otg_ctrl.a_bus_drop);
596}
597
598static ssize_t
599a_bus_drop_store(struct device *dev, struct device_attribute *attr,
600 const char *buf, size_t count)
601{
602 struct mv_otg *mvotg = dev_get_drvdata(dev);
603 if (!mvotg->phy.otg->default_a)
604 return -1;
605
606 if (count > 2)
607 return -1;
608
609 if (buf[0] == '0') {
610 mvotg->otg_ctrl.a_bus_drop = 0;
611 dev_dbg(&mvotg->pdev->dev,
612 "User request: a_bus_drop = 0\n");
613 } else if (buf[0] == '1') {
614 mvotg->otg_ctrl.a_bus_drop = 1;
615 mvotg->otg_ctrl.a_bus_req = 0;
616 dev_dbg(&mvotg->pdev->dev,
617 "User request: a_bus_drop = 1\n");
618 dev_dbg(&mvotg->pdev->dev,
619 "User request: and a_bus_req = 0\n");
620 }
621
622 if (spin_trylock(&mvotg->wq_lock)) {
623 mv_otg_run_state_machine(mvotg, 0);
624 spin_unlock(&mvotg->wq_lock);
625 }
626
627 return count;
628}
629
630static DEVICE_ATTR_RW(a_bus_drop);
631
632static struct attribute *inputs_attrs[] = {
633 &dev_attr_a_bus_req.attr,
634 &dev_attr_a_clr_err.attr,
635 &dev_attr_a_bus_drop.attr,
636 NULL,
637};
638
639static const struct attribute_group inputs_attr_group = {
640 .name = "inputs",
641 .attrs = inputs_attrs,
642};
643
644static const struct attribute_group *mv_otg_groups[] = {
645 &inputs_attr_group,
646 NULL,
647};
648
649static int mv_otg_remove(struct platform_device *pdev)
650{
651 struct mv_otg *mvotg = platform_get_drvdata(pdev);
652
653 if (mvotg->qwork) {
654 flush_workqueue(mvotg->qwork);
655 destroy_workqueue(mvotg->qwork);
656 }
657
658 mv_otg_disable(mvotg);
659
660 usb_remove_phy(&mvotg->phy);
661
662 return 0;
663}
664
665static int mv_otg_probe(struct platform_device *pdev)
666{
667 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
668 struct mv_otg *mvotg;
669 struct usb_otg *otg;
670 struct resource *r;
671 int retval = 0, i;
672
673 if (pdata == NULL) {
674 dev_err(&pdev->dev, "failed to get platform data\n");
675 return -ENODEV;
676 }
677
678 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
679 if (!mvotg)
680 return -ENOMEM;
681
682 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
683 if (!otg)
684 return -ENOMEM;
685
686 platform_set_drvdata(pdev, mvotg);
687
688 mvotg->pdev = pdev;
689 mvotg->pdata = pdata;
690
691 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
692 if (IS_ERR(mvotg->clk))
693 return PTR_ERR(mvotg->clk);
694
695 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
696 if (!mvotg->qwork) {
697 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
698 return -ENOMEM;
699 }
700
701 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
702
703 /* OTG common part */
704 mvotg->pdev = pdev;
705 mvotg->phy.dev = &pdev->dev;
706 mvotg->phy.otg = otg;
707 mvotg->phy.label = driver_name;
708
709 otg->state = OTG_STATE_UNDEFINED;
710 otg->usb_phy = &mvotg->phy;
711 otg->set_host = mv_otg_set_host;
712 otg->set_peripheral = mv_otg_set_peripheral;
713 otg->set_vbus = mv_otg_set_vbus;
714
715 for (i = 0; i < OTG_TIMER_NUM; i++)
716 timer_setup(&mvotg->otg_ctrl.timer[i],
717 mv_otg_timer_await_bcon, 0);
718
719 r = platform_get_resource_byname(mvotg->pdev,
720 IORESOURCE_MEM, "phyregs");
721 if (r == NULL) {
722 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
723 retval = -ENODEV;
724 goto err_destroy_workqueue;
725 }
726
727 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
728 if (mvotg->phy_regs == NULL) {
729 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
730 retval = -EFAULT;
731 goto err_destroy_workqueue;
732 }
733
734 r = platform_get_resource_byname(mvotg->pdev,
735 IORESOURCE_MEM, "capregs");
736 if (r == NULL) {
737 dev_err(&pdev->dev, "no I/O memory resource defined\n");
738 retval = -ENODEV;
739 goto err_destroy_workqueue;
740 }
741
742 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
743 if (mvotg->cap_regs == NULL) {
744 dev_err(&pdev->dev, "failed to map I/O memory\n");
745 retval = -EFAULT;
746 goto err_destroy_workqueue;
747 }
748
749 /* we will acces controller register, so enable the udc controller */
750 retval = mv_otg_enable_internal(mvotg);
751 if (retval) {
752 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
753 goto err_destroy_workqueue;
754 }
755
756 mvotg->op_regs =
757 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
758 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
759
760 if (pdata->id) {
761 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
762 NULL, mv_otg_inputs_irq,
763 IRQF_ONESHOT, "id", mvotg);
764 if (retval) {
765 dev_info(&pdev->dev,
766 "Failed to request irq for ID\n");
767 pdata->id = NULL;
768 }
769 }
770
771 if (pdata->vbus) {
772 mvotg->clock_gating = 1;
773 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
774 NULL, mv_otg_inputs_irq,
775 IRQF_ONESHOT, "vbus", mvotg);
776 if (retval) {
777 dev_info(&pdev->dev,
778 "Failed to request irq for VBUS, "
779 "disable clock gating\n");
780 mvotg->clock_gating = 0;
781 pdata->vbus = NULL;
782 }
783 }
784
785 if (pdata->disable_otg_clock_gating)
786 mvotg->clock_gating = 0;
787
788 mv_otg_reset(mvotg);
789 mv_otg_init_irq(mvotg);
790
791 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
792 if (r == NULL) {
793 dev_err(&pdev->dev, "no IRQ resource defined\n");
794 retval = -ENODEV;
795 goto err_disable_clk;
796 }
797
798 mvotg->irq = r->start;
799 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
800 driver_name, mvotg)) {
801 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
802 mvotg->irq);
803 mvotg->irq = 0;
804 retval = -ENODEV;
805 goto err_disable_clk;
806 }
807
808 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
809 if (retval < 0) {
810 dev_err(&pdev->dev, "can't register transceiver, %d\n",
811 retval);
812 goto err_disable_clk;
813 }
814
815 spin_lock_init(&mvotg->wq_lock);
816 if (spin_trylock(&mvotg->wq_lock)) {
817 mv_otg_run_state_machine(mvotg, 2 * HZ);
818 spin_unlock(&mvotg->wq_lock);
819 }
820
821 dev_info(&pdev->dev,
822 "successful probe OTG device %s clock gating.\n",
823 mvotg->clock_gating ? "with" : "without");
824
825 return 0;
826
827err_disable_clk:
828 mv_otg_disable_internal(mvotg);
829err_destroy_workqueue:
830 flush_workqueue(mvotg->qwork);
831 destroy_workqueue(mvotg->qwork);
832
833 return retval;
834}
835
836#ifdef CONFIG_PM
837static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
838{
839 struct mv_otg *mvotg = platform_get_drvdata(pdev);
840
841 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
842 dev_info(&pdev->dev,
843 "OTG state is not B_IDLE, it is %d!\n",
844 mvotg->phy.otg->state);
845 return -EAGAIN;
846 }
847
848 if (!mvotg->clock_gating)
849 mv_otg_disable_internal(mvotg);
850
851 return 0;
852}
853
854static int mv_otg_resume(struct platform_device *pdev)
855{
856 struct mv_otg *mvotg = platform_get_drvdata(pdev);
857 u32 otgsc;
858
859 if (!mvotg->clock_gating) {
860 mv_otg_enable_internal(mvotg);
861
862 otgsc = readl(&mvotg->op_regs->otgsc);
863 otgsc |= mvotg->irq_en;
864 writel(otgsc, &mvotg->op_regs->otgsc);
865
866 if (spin_trylock(&mvotg->wq_lock)) {
867 mv_otg_run_state_machine(mvotg, 0);
868 spin_unlock(&mvotg->wq_lock);
869 }
870 }
871 return 0;
872}
873#endif
874
875static struct platform_driver mv_otg_driver = {
876 .probe = mv_otg_probe,
877 .remove = mv_otg_remove,
878 .driver = {
879 .name = driver_name,
880 .dev_groups = mv_otg_groups,
881 },
882#ifdef CONFIG_PM
883 .suspend = mv_otg_suspend,
884 .resume = mv_otg_resume,
885#endif
886};
887module_platform_driver(mv_otg_driver);