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/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	/* Stop the controller */
143	tmp = readl(&mvotg->op_regs->usbcmd);
144	tmp &= ~USBCMD_RUN_STOP;
145	writel(tmp, &mvotg->op_regs->usbcmd);
146
147	/* Reset the controller to get default values */
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 /* CONFIG_USB */
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	/* work queue is single thread, or we need spin_lock to protect */
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			 * Now, we directly enter A_HOST. So set b_conn = 1
454			 * here. In fact, it need host driver to notify us.
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			 * Now, we has exited A_HOST. So set b_conn = 0
463			 * here. In fact, it need host driver to notify us.
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	 * if we have vbus, then the vbus detection for B-device
487	 * will be done by mv_otg_inputs_irq().
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	/* The clock may disabled at this time */
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	/* We will use this interface to change to A device */
535	if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
536	    && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
537		return -1;
538
539	/* The clock may disabled and we need to set irq for ID detected */
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 void mv_otg_remove(struct platform_device *pdev)
648{
649	struct mv_otg *mvotg = platform_get_drvdata(pdev);
650
651	if (mvotg->qwork)
652		destroy_workqueue(mvotg->qwork);
653
654	mv_otg_disable(mvotg);
655
656	usb_remove_phy(&mvotg->phy);
657}
658
659static int mv_otg_probe(struct platform_device *pdev)
660{
661	struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
662	struct mv_otg *mvotg;
663	struct usb_otg *otg;
664	struct resource *r;
665	int retval = 0, i;
666
667	if (pdata == NULL) {
668		dev_err(&pdev->dev, "failed to get platform data\n");
669		return -ENODEV;
670	}
671
672	mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
673	if (!mvotg)
674		return -ENOMEM;
675
676	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
677	if (!otg)
678		return -ENOMEM;
679
680	platform_set_drvdata(pdev, mvotg);
681
682	mvotg->pdev = pdev;
683	mvotg->pdata = pdata;
684
685	mvotg->clk = devm_clk_get(&pdev->dev, NULL);
686	if (IS_ERR(mvotg->clk))
687		return PTR_ERR(mvotg->clk);
688
689	mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
690	if (!mvotg->qwork) {
691		dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
692		return -ENOMEM;
693	}
694
695	INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
696
697	/* OTG common part */
698	mvotg->pdev = pdev;
699	mvotg->phy.dev = &pdev->dev;
700	mvotg->phy.otg = otg;
701	mvotg->phy.label = driver_name;
702
703	otg->state = OTG_STATE_UNDEFINED;
704	otg->usb_phy = &mvotg->phy;
705	otg->set_host = mv_otg_set_host;
706	otg->set_peripheral = mv_otg_set_peripheral;
707	otg->set_vbus = mv_otg_set_vbus;
708
709	for (i = 0; i < OTG_TIMER_NUM; i++)
710		timer_setup(&mvotg->otg_ctrl.timer[i],
711			    mv_otg_timer_await_bcon, 0);
712
713	r = platform_get_resource_byname(mvotg->pdev,
714					 IORESOURCE_MEM, "phyregs");
715	if (r == NULL) {
716		dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
717		retval = -ENODEV;
718		goto err_destroy_workqueue;
719	}
720
721	mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
722	if (mvotg->phy_regs == NULL) {
723		dev_err(&pdev->dev, "failed to map phy I/O memory\n");
724		retval = -EFAULT;
725		goto err_destroy_workqueue;
726	}
727
728	r = platform_get_resource_byname(mvotg->pdev,
729					 IORESOURCE_MEM, "capregs");
730	if (r == NULL) {
731		dev_err(&pdev->dev, "no I/O memory resource defined\n");
732		retval = -ENODEV;
733		goto err_destroy_workqueue;
734	}
735
736	mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
737	if (mvotg->cap_regs == NULL) {
738		dev_err(&pdev->dev, "failed to map I/O memory\n");
739		retval = -EFAULT;
740		goto err_destroy_workqueue;
741	}
742
743	/* we will acces controller register, so enable the udc controller */
744	retval = mv_otg_enable_internal(mvotg);
745	if (retval) {
746		dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
747		goto err_destroy_workqueue;
748	}
749
750	mvotg->op_regs =
751		(struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
752			+ (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
753
754	if (pdata->id) {
755		retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
756						NULL, mv_otg_inputs_irq,
757						IRQF_ONESHOT, "id", mvotg);
758		if (retval) {
759			dev_info(&pdev->dev,
760				 "Failed to request irq for ID\n");
761			pdata->id = NULL;
762		}
763	}
764
765	if (pdata->vbus) {
766		mvotg->clock_gating = 1;
767		retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
768						NULL, mv_otg_inputs_irq,
769						IRQF_ONESHOT, "vbus", mvotg);
770		if (retval) {
771			dev_info(&pdev->dev,
772				 "Failed to request irq for VBUS, "
773				 "disable clock gating\n");
774			mvotg->clock_gating = 0;
775			pdata->vbus = NULL;
776		}
777	}
778
779	if (pdata->disable_otg_clock_gating)
780		mvotg->clock_gating = 0;
781
782	mv_otg_reset(mvotg);
783	mv_otg_init_irq(mvotg);
784
785	r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
786	if (r == NULL) {
787		dev_err(&pdev->dev, "no IRQ resource defined\n");
788		retval = -ENODEV;
789		goto err_disable_clk;
790	}
791
792	mvotg->irq = r->start;
793	if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
794			driver_name, mvotg)) {
795		dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
796			mvotg->irq);
797		mvotg->irq = 0;
798		retval = -ENODEV;
799		goto err_disable_clk;
800	}
801
802	retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
803	if (retval < 0) {
804		dev_err(&pdev->dev, "can't register transceiver, %d\n",
805			retval);
806		goto err_disable_clk;
807	}
808
809	spin_lock_init(&mvotg->wq_lock);
810	if (spin_trylock(&mvotg->wq_lock)) {
811		mv_otg_run_state_machine(mvotg, 2 * HZ);
812		spin_unlock(&mvotg->wq_lock);
813	}
814
815	dev_info(&pdev->dev,
816		 "successful probe OTG device %s clock gating.\n",
817		 mvotg->clock_gating ? "with" : "without");
818
819	return 0;
820
821err_disable_clk:
822	mv_otg_disable_internal(mvotg);
823err_destroy_workqueue:
824	destroy_workqueue(mvotg->qwork);
825
826	return retval;
827}
828
829#ifdef CONFIG_PM
830static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
831{
832	struct mv_otg *mvotg = platform_get_drvdata(pdev);
833
834	if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
835		dev_info(&pdev->dev,
836			 "OTG state is not B_IDLE, it is %d!\n",
837			 mvotg->phy.otg->state);
838		return -EAGAIN;
839	}
840
841	if (!mvotg->clock_gating)
842		mv_otg_disable_internal(mvotg);
843
844	return 0;
845}
846
847static int mv_otg_resume(struct platform_device *pdev)
848{
849	struct mv_otg *mvotg = platform_get_drvdata(pdev);
850	u32 otgsc;
851
852	if (!mvotg->clock_gating) {
853		mv_otg_enable_internal(mvotg);
854
855		otgsc = readl(&mvotg->op_regs->otgsc);
856		otgsc |= mvotg->irq_en;
857		writel(otgsc, &mvotg->op_regs->otgsc);
858
859		if (spin_trylock(&mvotg->wq_lock)) {
860			mv_otg_run_state_machine(mvotg, 0);
861			spin_unlock(&mvotg->wq_lock);
862		}
863	}
864	return 0;
865}
866#endif
867
868static struct platform_driver mv_otg_driver = {
869	.probe = mv_otg_probe,
870	.remove_new = mv_otg_remove,
871	.driver = {
872		   .name = driver_name,
873		   .dev_groups = mv_otg_groups,
874		   },
875#ifdef CONFIG_PM
876	.suspend = mv_otg_suspend,
877	.resume = mv_otg_resume,
878#endif
879};
880module_platform_driver(mv_otg_driver);
881