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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 /* FALL THROUGH */
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_phy *phy;
405 struct usb_otg *otg;
406 int old_state;
407
408 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
409
410run:
411 /* work queue is single thread, or we need spin_lock to protect */
412 phy = &mvotg->phy;
413 otg = mvotg->phy.otg;
414 old_state = otg->state;
415
416 if (!mvotg->active)
417 return;
418
419 mv_otg_update_inputs(mvotg);
420 mv_otg_update_state(mvotg);
421
422 if (old_state != mvotg->phy.otg->state) {
423 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
424 state_string[old_state],
425 state_string[mvotg->phy.otg->state]);
426
427 switch (mvotg->phy.otg->state) {
428 case OTG_STATE_B_IDLE:
429 otg->default_a = 0;
430 if (old_state == OTG_STATE_B_PERIPHERAL)
431 mv_otg_start_periphrals(mvotg, 0);
432 mv_otg_reset(mvotg);
433 mv_otg_disable(mvotg);
434 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
435 break;
436 case OTG_STATE_B_PERIPHERAL:
437 mv_otg_enable(mvotg);
438 mv_otg_start_periphrals(mvotg, 1);
439 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
440 break;
441 case OTG_STATE_A_IDLE:
442 otg->default_a = 1;
443 mv_otg_enable(mvotg);
444 if (old_state == OTG_STATE_A_WAIT_VFALL)
445 mv_otg_start_host(mvotg, 0);
446 mv_otg_reset(mvotg);
447 break;
448 case OTG_STATE_A_WAIT_VRISE:
449 mv_otg_set_vbus(otg, 1);
450 break;
451 case OTG_STATE_A_WAIT_BCON:
452 if (old_state != OTG_STATE_A_HOST)
453 mv_otg_start_host(mvotg, 1);
454 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
455 T_A_WAIT_BCON);
456 /*
457 * Now, we directly enter A_HOST. So set b_conn = 1
458 * here. In fact, it need host driver to notify us.
459 */
460 mvotg->otg_ctrl.b_conn = 1;
461 break;
462 case OTG_STATE_A_HOST:
463 break;
464 case OTG_STATE_A_WAIT_VFALL:
465 /*
466 * Now, we has exited A_HOST. So set b_conn = 0
467 * here. In fact, it need host driver to notify us.
468 */
469 mvotg->otg_ctrl.b_conn = 0;
470 mv_otg_set_vbus(otg, 0);
471 break;
472 case OTG_STATE_A_VBUS_ERR:
473 break;
474 default:
475 break;
476 }
477 goto run;
478 }
479}
480
481static irqreturn_t mv_otg_irq(int irq, void *dev)
482{
483 struct mv_otg *mvotg = dev;
484 u32 otgsc;
485
486 otgsc = readl(&mvotg->op_regs->otgsc);
487 writel(otgsc, &mvotg->op_regs->otgsc);
488
489 /*
490 * if we have vbus, then the vbus detection for B-device
491 * will be done by mv_otg_inputs_irq().
492 */
493 if (mvotg->pdata->vbus)
494 if ((otgsc & OTGSC_STS_USB_ID) &&
495 !(otgsc & OTGSC_INTSTS_USB_ID))
496 return IRQ_NONE;
497
498 if ((otgsc & mvotg->irq_status) == 0)
499 return IRQ_NONE;
500
501 mv_otg_run_state_machine(mvotg, 0);
502
503 return IRQ_HANDLED;
504}
505
506static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
507{
508 struct mv_otg *mvotg = dev;
509
510 /* The clock may disabled at this time */
511 if (!mvotg->active) {
512 mv_otg_enable(mvotg);
513 mv_otg_init_irq(mvotg);
514 }
515
516 mv_otg_run_state_machine(mvotg, 0);
517
518 return IRQ_HANDLED;
519}
520
521static ssize_t
522a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf)
523{
524 struct mv_otg *mvotg = dev_get_drvdata(dev);
525 return scnprintf(buf, PAGE_SIZE, "%d\n",
526 mvotg->otg_ctrl.a_bus_req);
527}
528
529static ssize_t
530a_bus_req_store(struct device *dev, struct device_attribute *attr,
531 const char *buf, size_t count)
532{
533 struct mv_otg *mvotg = dev_get_drvdata(dev);
534
535 if (count > 2)
536 return -1;
537
538 /* We will use this interface to change to A device */
539 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
540 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
541 return -1;
542
543 /* The clock may disabled and we need to set irq for ID detected */
544 mv_otg_enable(mvotg);
545 mv_otg_init_irq(mvotg);
546
547 if (buf[0] == '1') {
548 mvotg->otg_ctrl.a_bus_req = 1;
549 mvotg->otg_ctrl.a_bus_drop = 0;
550 dev_dbg(&mvotg->pdev->dev,
551 "User request: a_bus_req = 1\n");
552
553 if (spin_trylock(&mvotg->wq_lock)) {
554 mv_otg_run_state_machine(mvotg, 0);
555 spin_unlock(&mvotg->wq_lock);
556 }
557 }
558
559 return count;
560}
561
562static DEVICE_ATTR_RW(a_bus_req);
563
564static ssize_t
565a_clr_err_store(struct device *dev, struct device_attribute *attr,
566 const char *buf, size_t count)
567{
568 struct mv_otg *mvotg = dev_get_drvdata(dev);
569 if (!mvotg->phy.otg->default_a)
570 return -1;
571
572 if (count > 2)
573 return -1;
574
575 if (buf[0] == '1') {
576 mvotg->otg_ctrl.a_clr_err = 1;
577 dev_dbg(&mvotg->pdev->dev,
578 "User request: a_clr_err = 1\n");
579 }
580
581 if (spin_trylock(&mvotg->wq_lock)) {
582 mv_otg_run_state_machine(mvotg, 0);
583 spin_unlock(&mvotg->wq_lock);
584 }
585
586 return count;
587}
588
589static DEVICE_ATTR_WO(a_clr_err);
590
591static ssize_t
592a_bus_drop_show(struct device *dev, struct device_attribute *attr,
593 char *buf)
594{
595 struct mv_otg *mvotg = dev_get_drvdata(dev);
596 return scnprintf(buf, PAGE_SIZE, "%d\n",
597 mvotg->otg_ctrl.a_bus_drop);
598}
599
600static ssize_t
601a_bus_drop_store(struct device *dev, struct device_attribute *attr,
602 const char *buf, size_t count)
603{
604 struct mv_otg *mvotg = dev_get_drvdata(dev);
605 if (!mvotg->phy.otg->default_a)
606 return -1;
607
608 if (count > 2)
609 return -1;
610
611 if (buf[0] == '0') {
612 mvotg->otg_ctrl.a_bus_drop = 0;
613 dev_dbg(&mvotg->pdev->dev,
614 "User request: a_bus_drop = 0\n");
615 } else if (buf[0] == '1') {
616 mvotg->otg_ctrl.a_bus_drop = 1;
617 mvotg->otg_ctrl.a_bus_req = 0;
618 dev_dbg(&mvotg->pdev->dev,
619 "User request: a_bus_drop = 1\n");
620 dev_dbg(&mvotg->pdev->dev,
621 "User request: and a_bus_req = 0\n");
622 }
623
624 if (spin_trylock(&mvotg->wq_lock)) {
625 mv_otg_run_state_machine(mvotg, 0);
626 spin_unlock(&mvotg->wq_lock);
627 }
628
629 return count;
630}
631
632static DEVICE_ATTR_RW(a_bus_drop);
633
634static struct attribute *inputs_attrs[] = {
635 &dev_attr_a_bus_req.attr,
636 &dev_attr_a_clr_err.attr,
637 &dev_attr_a_bus_drop.attr,
638 NULL,
639};
640
641static const struct attribute_group inputs_attr_group = {
642 .name = "inputs",
643 .attrs = inputs_attrs,
644};
645
646static int mv_otg_remove(struct platform_device *pdev)
647{
648 struct mv_otg *mvotg = platform_get_drvdata(pdev);
649
650 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
651
652 if (mvotg->qwork) {
653 flush_workqueue(mvotg->qwork);
654 destroy_workqueue(mvotg->qwork);
655 }
656
657 mv_otg_disable(mvotg);
658
659 usb_remove_phy(&mvotg->phy);
660
661 return 0;
662}
663
664static int mv_otg_probe(struct platform_device *pdev)
665{
666 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
667 struct mv_otg *mvotg;
668 struct usb_otg *otg;
669 struct resource *r;
670 int retval = 0, i;
671
672 if (pdata == NULL) {
673 dev_err(&pdev->dev, "failed to get platform data\n");
674 return -ENODEV;
675 }
676
677 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
678 if (!mvotg)
679 return -ENOMEM;
680
681 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
682 if (!otg)
683 return -ENOMEM;
684
685 platform_set_drvdata(pdev, mvotg);
686
687 mvotg->pdev = pdev;
688 mvotg->pdata = pdata;
689
690 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
691 if (IS_ERR(mvotg->clk))
692 return PTR_ERR(mvotg->clk);
693
694 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
695 if (!mvotg->qwork) {
696 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
697 return -ENOMEM;
698 }
699
700 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
701
702 /* OTG common part */
703 mvotg->pdev = pdev;
704 mvotg->phy.dev = &pdev->dev;
705 mvotg->phy.otg = otg;
706 mvotg->phy.label = driver_name;
707
708 otg->state = OTG_STATE_UNDEFINED;
709 otg->usb_phy = &mvotg->phy;
710 otg->set_host = mv_otg_set_host;
711 otg->set_peripheral = mv_otg_set_peripheral;
712 otg->set_vbus = mv_otg_set_vbus;
713
714 for (i = 0; i < OTG_TIMER_NUM; i++)
715 timer_setup(&mvotg->otg_ctrl.timer[i],
716 mv_otg_timer_await_bcon, 0);
717
718 r = platform_get_resource_byname(mvotg->pdev,
719 IORESOURCE_MEM, "phyregs");
720 if (r == NULL) {
721 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
722 retval = -ENODEV;
723 goto err_destroy_workqueue;
724 }
725
726 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
727 if (mvotg->phy_regs == NULL) {
728 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
729 retval = -EFAULT;
730 goto err_destroy_workqueue;
731 }
732
733 r = platform_get_resource_byname(mvotg->pdev,
734 IORESOURCE_MEM, "capregs");
735 if (r == NULL) {
736 dev_err(&pdev->dev, "no I/O memory resource defined\n");
737 retval = -ENODEV;
738 goto err_destroy_workqueue;
739 }
740
741 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
742 if (mvotg->cap_regs == NULL) {
743 dev_err(&pdev->dev, "failed to map I/O memory\n");
744 retval = -EFAULT;
745 goto err_destroy_workqueue;
746 }
747
748 /* we will acces controller register, so enable the udc controller */
749 retval = mv_otg_enable_internal(mvotg);
750 if (retval) {
751 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
752 goto err_destroy_workqueue;
753 }
754
755 mvotg->op_regs =
756 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
757 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
758
759 if (pdata->id) {
760 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
761 NULL, mv_otg_inputs_irq,
762 IRQF_ONESHOT, "id", mvotg);
763 if (retval) {
764 dev_info(&pdev->dev,
765 "Failed to request irq for ID\n");
766 pdata->id = NULL;
767 }
768 }
769
770 if (pdata->vbus) {
771 mvotg->clock_gating = 1;
772 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
773 NULL, mv_otg_inputs_irq,
774 IRQF_ONESHOT, "vbus", mvotg);
775 if (retval) {
776 dev_info(&pdev->dev,
777 "Failed to request irq for VBUS, "
778 "disable clock gating\n");
779 mvotg->clock_gating = 0;
780 pdata->vbus = NULL;
781 }
782 }
783
784 if (pdata->disable_otg_clock_gating)
785 mvotg->clock_gating = 0;
786
787 mv_otg_reset(mvotg);
788 mv_otg_init_irq(mvotg);
789
790 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
791 if (r == NULL) {
792 dev_err(&pdev->dev, "no IRQ resource defined\n");
793 retval = -ENODEV;
794 goto err_disable_clk;
795 }
796
797 mvotg->irq = r->start;
798 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
799 driver_name, mvotg)) {
800 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
801 mvotg->irq);
802 mvotg->irq = 0;
803 retval = -ENODEV;
804 goto err_disable_clk;
805 }
806
807 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
808 if (retval < 0) {
809 dev_err(&pdev->dev, "can't register transceiver, %d\n",
810 retval);
811 goto err_disable_clk;
812 }
813
814 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
815 if (retval < 0) {
816 dev_dbg(&pdev->dev,
817 "Can't register sysfs attr group: %d\n", retval);
818 goto err_remove_phy;
819 }
820
821 spin_lock_init(&mvotg->wq_lock);
822 if (spin_trylock(&mvotg->wq_lock)) {
823 mv_otg_run_state_machine(mvotg, 2 * HZ);
824 spin_unlock(&mvotg->wq_lock);
825 }
826
827 dev_info(&pdev->dev,
828 "successful probe OTG device %s clock gating.\n",
829 mvotg->clock_gating ? "with" : "without");
830
831 return 0;
832
833err_remove_phy:
834 usb_remove_phy(&mvotg->phy);
835err_disable_clk:
836 mv_otg_disable_internal(mvotg);
837err_destroy_workqueue:
838 flush_workqueue(mvotg->qwork);
839 destroy_workqueue(mvotg->qwork);
840
841 return retval;
842}
843
844#ifdef CONFIG_PM
845static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
846{
847 struct mv_otg *mvotg = platform_get_drvdata(pdev);
848
849 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
850 dev_info(&pdev->dev,
851 "OTG state is not B_IDLE, it is %d!\n",
852 mvotg->phy.otg->state);
853 return -EAGAIN;
854 }
855
856 if (!mvotg->clock_gating)
857 mv_otg_disable_internal(mvotg);
858
859 return 0;
860}
861
862static int mv_otg_resume(struct platform_device *pdev)
863{
864 struct mv_otg *mvotg = platform_get_drvdata(pdev);
865 u32 otgsc;
866
867 if (!mvotg->clock_gating) {
868 mv_otg_enable_internal(mvotg);
869
870 otgsc = readl(&mvotg->op_regs->otgsc);
871 otgsc |= mvotg->irq_en;
872 writel(otgsc, &mvotg->op_regs->otgsc);
873
874 if (spin_trylock(&mvotg->wq_lock)) {
875 mv_otg_run_state_machine(mvotg, 0);
876 spin_unlock(&mvotg->wq_lock);
877 }
878 }
879 return 0;
880}
881#endif
882
883static struct platform_driver mv_otg_driver = {
884 .probe = mv_otg_probe,
885 .remove = mv_otg_remove,
886 .driver = {
887 .name = driver_name,
888 },
889#ifdef CONFIG_PM
890 .suspend = mv_otg_suspend,
891 .resume = mv_otg_resume,
892#endif
893};
894module_platform_driver(mv_otg_driver);