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1/*
2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
3 * Author: Chao Xie <chao.xie@marvell.com>
4 * Neil Zhang <zhangwm@marvell.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/io.h>
15#include <linux/uaccess.h>
16#include <linux/device.h>
17#include <linux/proc_fs.h>
18#include <linux/clk.h>
19#include <linux/workqueue.h>
20#include <linux/platform_device.h>
21
22#include <linux/usb.h>
23#include <linux/usb/ch9.h>
24#include <linux/usb/otg.h>
25#include <linux/usb/gadget.h>
26#include <linux/usb/hcd.h>
27#include <linux/platform_data/mv_usb.h>
28
29#include "phy-mv-usb.h"
30
31#define DRIVER_DESC "Marvell USB OTG transceiver driver"
32#define DRIVER_VERSION "Jan 20, 2010"
33
34MODULE_DESCRIPTION(DRIVER_DESC);
35MODULE_VERSION(DRIVER_VERSION);
36MODULE_LICENSE("GPL");
37
38static const char driver_name[] = "mv-otg";
39
40static char *state_string[] = {
41 "undefined",
42 "b_idle",
43 "b_srp_init",
44 "b_peripheral",
45 "b_wait_acon",
46 "b_host",
47 "a_idle",
48 "a_wait_vrise",
49 "a_wait_bcon",
50 "a_host",
51 "a_suspend",
52 "a_peripheral",
53 "a_wait_vfall",
54 "a_vbus_err"
55};
56
57static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
58{
59 struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
60 if (mvotg->pdata->set_vbus == NULL)
61 return -ENODEV;
62
63 return mvotg->pdata->set_vbus(on);
64}
65
66static int mv_otg_set_host(struct usb_otg *otg,
67 struct usb_bus *host)
68{
69 otg->host = host;
70
71 return 0;
72}
73
74static int mv_otg_set_peripheral(struct usb_otg *otg,
75 struct usb_gadget *gadget)
76{
77 otg->gadget = gadget;
78
79 return 0;
80}
81
82static void mv_otg_run_state_machine(struct mv_otg *mvotg,
83 unsigned long delay)
84{
85 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
86 if (!mvotg->qwork)
87 return;
88
89 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
90}
91
92static void mv_otg_timer_await_bcon(unsigned long data)
93{
94 struct mv_otg *mvotg = (struct mv_otg *) data;
95
96 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
97
98 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
99
100 if (spin_trylock(&mvotg->wq_lock)) {
101 mv_otg_run_state_machine(mvotg, 0);
102 spin_unlock(&mvotg->wq_lock);
103 }
104}
105
106static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
107{
108 struct timer_list *timer;
109
110 if (id >= OTG_TIMER_NUM)
111 return -EINVAL;
112
113 timer = &mvotg->otg_ctrl.timer[id];
114
115 if (timer_pending(timer))
116 del_timer(timer);
117
118 return 0;
119}
120
121static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
122 unsigned long interval,
123 void (*callback) (unsigned long))
124{
125 struct timer_list *timer;
126
127 if (id >= OTG_TIMER_NUM)
128 return -EINVAL;
129
130 timer = &mvotg->otg_ctrl.timer[id];
131 if (timer_pending(timer)) {
132 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
133 return -EBUSY;
134 }
135
136 init_timer(timer);
137 timer->data = (unsigned long) mvotg;
138 timer->function = callback;
139 timer->expires = jiffies + interval;
140 add_timer(timer);
141
142 return 0;
143}
144
145static int mv_otg_reset(struct mv_otg *mvotg)
146{
147 unsigned int loops;
148 u32 tmp;
149
150 /* Stop the controller */
151 tmp = readl(&mvotg->op_regs->usbcmd);
152 tmp &= ~USBCMD_RUN_STOP;
153 writel(tmp, &mvotg->op_regs->usbcmd);
154
155 /* Reset the controller to get default values */
156 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
157
158 loops = 500;
159 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
160 if (loops == 0) {
161 dev_err(&mvotg->pdev->dev,
162 "Wait for RESET completed TIMEOUT\n");
163 return -ETIMEDOUT;
164 }
165 loops--;
166 udelay(20);
167 }
168
169 writel(0x0, &mvotg->op_regs->usbintr);
170 tmp = readl(&mvotg->op_regs->usbsts);
171 writel(tmp, &mvotg->op_regs->usbsts);
172
173 return 0;
174}
175
176static void mv_otg_init_irq(struct mv_otg *mvotg)
177{
178 u32 otgsc;
179
180 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
181 | OTGSC_INTR_A_VBUS_VALID;
182 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
183 | OTGSC_INTSTS_A_VBUS_VALID;
184
185 if (mvotg->pdata->vbus == NULL) {
186 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
187 | OTGSC_INTR_B_SESSION_END;
188 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
189 | OTGSC_INTSTS_B_SESSION_END;
190 }
191
192 if (mvotg->pdata->id == NULL) {
193 mvotg->irq_en |= OTGSC_INTR_USB_ID;
194 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
195 }
196
197 otgsc = readl(&mvotg->op_regs->otgsc);
198 otgsc |= mvotg->irq_en;
199 writel(otgsc, &mvotg->op_regs->otgsc);
200}
201
202static void mv_otg_start_host(struct mv_otg *mvotg, int on)
203{
204#ifdef CONFIG_USB
205 struct usb_otg *otg = mvotg->phy.otg;
206 struct usb_hcd *hcd;
207
208 if (!otg->host)
209 return;
210
211 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
212
213 hcd = bus_to_hcd(otg->host);
214
215 if (on) {
216 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
217 device_wakeup_enable(hcd->self.controller);
218 } else {
219 usb_remove_hcd(hcd);
220 }
221#endif /* CONFIG_USB */
222}
223
224static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
225{
226 struct usb_otg *otg = mvotg->phy.otg;
227
228 if (!otg->gadget)
229 return;
230
231 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
232
233 if (on)
234 usb_gadget_vbus_connect(otg->gadget);
235 else
236 usb_gadget_vbus_disconnect(otg->gadget);
237}
238
239static void otg_clock_enable(struct mv_otg *mvotg)
240{
241 clk_prepare_enable(mvotg->clk);
242}
243
244static void otg_clock_disable(struct mv_otg *mvotg)
245{
246 clk_disable_unprepare(mvotg->clk);
247}
248
249static int mv_otg_enable_internal(struct mv_otg *mvotg)
250{
251 int retval = 0;
252
253 if (mvotg->active)
254 return 0;
255
256 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
257
258 otg_clock_enable(mvotg);
259 if (mvotg->pdata->phy_init) {
260 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
261 if (retval) {
262 dev_err(&mvotg->pdev->dev,
263 "init phy error %d\n", retval);
264 otg_clock_disable(mvotg);
265 return retval;
266 }
267 }
268 mvotg->active = 1;
269
270 return 0;
271
272}
273
274static int mv_otg_enable(struct mv_otg *mvotg)
275{
276 if (mvotg->clock_gating)
277 return mv_otg_enable_internal(mvotg);
278
279 return 0;
280}
281
282static void mv_otg_disable_internal(struct mv_otg *mvotg)
283{
284 if (mvotg->active) {
285 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
286 if (mvotg->pdata->phy_deinit)
287 mvotg->pdata->phy_deinit(mvotg->phy_regs);
288 otg_clock_disable(mvotg);
289 mvotg->active = 0;
290 }
291}
292
293static void mv_otg_disable(struct mv_otg *mvotg)
294{
295 if (mvotg->clock_gating)
296 mv_otg_disable_internal(mvotg);
297}
298
299static void mv_otg_update_inputs(struct mv_otg *mvotg)
300{
301 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
302 u32 otgsc;
303
304 otgsc = readl(&mvotg->op_regs->otgsc);
305
306 if (mvotg->pdata->vbus) {
307 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
308 otg_ctrl->b_sess_vld = 1;
309 otg_ctrl->b_sess_end = 0;
310 } else {
311 otg_ctrl->b_sess_vld = 0;
312 otg_ctrl->b_sess_end = 1;
313 }
314 } else {
315 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
316 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
317 }
318
319 if (mvotg->pdata->id)
320 otg_ctrl->id = !!mvotg->pdata->id->poll();
321 else
322 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
323
324 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
325 otg_ctrl->a_bus_req = 1;
326
327 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
328 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
329
330 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
331 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
332 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
333 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
334 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
335 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
336}
337
338static void mv_otg_update_state(struct mv_otg *mvotg)
339{
340 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
341 struct usb_phy *phy = &mvotg->phy;
342 int old_state = phy->state;
343
344 switch (old_state) {
345 case OTG_STATE_UNDEFINED:
346 phy->state = OTG_STATE_B_IDLE;
347 /* FALL THROUGH */
348 case OTG_STATE_B_IDLE:
349 if (otg_ctrl->id == 0)
350 phy->state = OTG_STATE_A_IDLE;
351 else if (otg_ctrl->b_sess_vld)
352 phy->state = OTG_STATE_B_PERIPHERAL;
353 break;
354 case OTG_STATE_B_PERIPHERAL:
355 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
356 phy->state = OTG_STATE_B_IDLE;
357 break;
358 case OTG_STATE_A_IDLE:
359 if (otg_ctrl->id)
360 phy->state = OTG_STATE_B_IDLE;
361 else if (!(otg_ctrl->a_bus_drop) &&
362 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
363 phy->state = OTG_STATE_A_WAIT_VRISE;
364 break;
365 case OTG_STATE_A_WAIT_VRISE:
366 if (otg_ctrl->a_vbus_vld)
367 phy->state = OTG_STATE_A_WAIT_BCON;
368 break;
369 case OTG_STATE_A_WAIT_BCON:
370 if (otg_ctrl->id || otg_ctrl->a_bus_drop
371 || otg_ctrl->a_wait_bcon_timeout) {
372 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
373 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
374 phy->state = OTG_STATE_A_WAIT_VFALL;
375 otg_ctrl->a_bus_req = 0;
376 } else if (!otg_ctrl->a_vbus_vld) {
377 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
378 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
379 phy->state = OTG_STATE_A_VBUS_ERR;
380 } else if (otg_ctrl->b_conn) {
381 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
382 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
383 phy->state = OTG_STATE_A_HOST;
384 }
385 break;
386 case OTG_STATE_A_HOST:
387 if (otg_ctrl->id || !otg_ctrl->b_conn
388 || otg_ctrl->a_bus_drop)
389 phy->state = OTG_STATE_A_WAIT_BCON;
390 else if (!otg_ctrl->a_vbus_vld)
391 phy->state = OTG_STATE_A_VBUS_ERR;
392 break;
393 case OTG_STATE_A_WAIT_VFALL:
394 if (otg_ctrl->id
395 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
396 || otg_ctrl->a_bus_req)
397 phy->state = OTG_STATE_A_IDLE;
398 break;
399 case OTG_STATE_A_VBUS_ERR:
400 if (otg_ctrl->id || otg_ctrl->a_clr_err
401 || otg_ctrl->a_bus_drop) {
402 otg_ctrl->a_clr_err = 0;
403 phy->state = OTG_STATE_A_WAIT_VFALL;
404 }
405 break;
406 default:
407 break;
408 }
409}
410
411static void mv_otg_work(struct work_struct *work)
412{
413 struct mv_otg *mvotg;
414 struct usb_phy *phy;
415 struct usb_otg *otg;
416 int old_state;
417
418 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
419
420run:
421 /* work queue is single thread, or we need spin_lock to protect */
422 phy = &mvotg->phy;
423 otg = phy->otg;
424 old_state = phy->state;
425
426 if (!mvotg->active)
427 return;
428
429 mv_otg_update_inputs(mvotg);
430 mv_otg_update_state(mvotg);
431
432 if (old_state != phy->state) {
433 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
434 state_string[old_state],
435 state_string[phy->state]);
436
437 switch (phy->state) {
438 case OTG_STATE_B_IDLE:
439 otg->default_a = 0;
440 if (old_state == OTG_STATE_B_PERIPHERAL)
441 mv_otg_start_periphrals(mvotg, 0);
442 mv_otg_reset(mvotg);
443 mv_otg_disable(mvotg);
444 break;
445 case OTG_STATE_B_PERIPHERAL:
446 mv_otg_enable(mvotg);
447 mv_otg_start_periphrals(mvotg, 1);
448 break;
449 case OTG_STATE_A_IDLE:
450 otg->default_a = 1;
451 mv_otg_enable(mvotg);
452 if (old_state == OTG_STATE_A_WAIT_VFALL)
453 mv_otg_start_host(mvotg, 0);
454 mv_otg_reset(mvotg);
455 break;
456 case OTG_STATE_A_WAIT_VRISE:
457 mv_otg_set_vbus(otg, 1);
458 break;
459 case OTG_STATE_A_WAIT_BCON:
460 if (old_state != OTG_STATE_A_HOST)
461 mv_otg_start_host(mvotg, 1);
462 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
463 T_A_WAIT_BCON,
464 mv_otg_timer_await_bcon);
465 /*
466 * Now, we directly enter A_HOST. So set b_conn = 1
467 * here. In fact, it need host driver to notify us.
468 */
469 mvotg->otg_ctrl.b_conn = 1;
470 break;
471 case OTG_STATE_A_HOST:
472 break;
473 case OTG_STATE_A_WAIT_VFALL:
474 /*
475 * Now, we has exited A_HOST. So set b_conn = 0
476 * here. In fact, it need host driver to notify us.
477 */
478 mvotg->otg_ctrl.b_conn = 0;
479 mv_otg_set_vbus(otg, 0);
480 break;
481 case OTG_STATE_A_VBUS_ERR:
482 break;
483 default:
484 break;
485 }
486 goto run;
487 }
488}
489
490static irqreturn_t mv_otg_irq(int irq, void *dev)
491{
492 struct mv_otg *mvotg = dev;
493 u32 otgsc;
494
495 otgsc = readl(&mvotg->op_regs->otgsc);
496 writel(otgsc, &mvotg->op_regs->otgsc);
497
498 /*
499 * if we have vbus, then the vbus detection for B-device
500 * will be done by mv_otg_inputs_irq().
501 */
502 if (mvotg->pdata->vbus)
503 if ((otgsc & OTGSC_STS_USB_ID) &&
504 !(otgsc & OTGSC_INTSTS_USB_ID))
505 return IRQ_NONE;
506
507 if ((otgsc & mvotg->irq_status) == 0)
508 return IRQ_NONE;
509
510 mv_otg_run_state_machine(mvotg, 0);
511
512 return IRQ_HANDLED;
513}
514
515static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
516{
517 struct mv_otg *mvotg = dev;
518
519 /* The clock may disabled at this time */
520 if (!mvotg->active) {
521 mv_otg_enable(mvotg);
522 mv_otg_init_irq(mvotg);
523 }
524
525 mv_otg_run_state_machine(mvotg, 0);
526
527 return IRQ_HANDLED;
528}
529
530static ssize_t
531get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
532{
533 struct mv_otg *mvotg = dev_get_drvdata(dev);
534 return scnprintf(buf, PAGE_SIZE, "%d\n",
535 mvotg->otg_ctrl.a_bus_req);
536}
537
538static ssize_t
539set_a_bus_req(struct device *dev, struct device_attribute *attr,
540 const char *buf, size_t count)
541{
542 struct mv_otg *mvotg = dev_get_drvdata(dev);
543
544 if (count > 2)
545 return -1;
546
547 /* We will use this interface to change to A device */
548 if (mvotg->phy.state != OTG_STATE_B_IDLE
549 && mvotg->phy.state != OTG_STATE_A_IDLE)
550 return -1;
551
552 /* The clock may disabled and we need to set irq for ID detected */
553 mv_otg_enable(mvotg);
554 mv_otg_init_irq(mvotg);
555
556 if (buf[0] == '1') {
557 mvotg->otg_ctrl.a_bus_req = 1;
558 mvotg->otg_ctrl.a_bus_drop = 0;
559 dev_dbg(&mvotg->pdev->dev,
560 "User request: a_bus_req = 1\n");
561
562 if (spin_trylock(&mvotg->wq_lock)) {
563 mv_otg_run_state_machine(mvotg, 0);
564 spin_unlock(&mvotg->wq_lock);
565 }
566 }
567
568 return count;
569}
570
571static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
572 set_a_bus_req);
573
574static ssize_t
575set_a_clr_err(struct device *dev, struct device_attribute *attr,
576 const char *buf, size_t count)
577{
578 struct mv_otg *mvotg = dev_get_drvdata(dev);
579 if (!mvotg->phy.otg->default_a)
580 return -1;
581
582 if (count > 2)
583 return -1;
584
585 if (buf[0] == '1') {
586 mvotg->otg_ctrl.a_clr_err = 1;
587 dev_dbg(&mvotg->pdev->dev,
588 "User request: a_clr_err = 1\n");
589 }
590
591 if (spin_trylock(&mvotg->wq_lock)) {
592 mv_otg_run_state_machine(mvotg, 0);
593 spin_unlock(&mvotg->wq_lock);
594 }
595
596 return count;
597}
598
599static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
600
601static ssize_t
602get_a_bus_drop(struct device *dev, struct device_attribute *attr,
603 char *buf)
604{
605 struct mv_otg *mvotg = dev_get_drvdata(dev);
606 return scnprintf(buf, PAGE_SIZE, "%d\n",
607 mvotg->otg_ctrl.a_bus_drop);
608}
609
610static ssize_t
611set_a_bus_drop(struct device *dev, struct device_attribute *attr,
612 const char *buf, size_t count)
613{
614 struct mv_otg *mvotg = dev_get_drvdata(dev);
615 if (!mvotg->phy.otg->default_a)
616 return -1;
617
618 if (count > 2)
619 return -1;
620
621 if (buf[0] == '0') {
622 mvotg->otg_ctrl.a_bus_drop = 0;
623 dev_dbg(&mvotg->pdev->dev,
624 "User request: a_bus_drop = 0\n");
625 } else if (buf[0] == '1') {
626 mvotg->otg_ctrl.a_bus_drop = 1;
627 mvotg->otg_ctrl.a_bus_req = 0;
628 dev_dbg(&mvotg->pdev->dev,
629 "User request: a_bus_drop = 1\n");
630 dev_dbg(&mvotg->pdev->dev,
631 "User request: and a_bus_req = 0\n");
632 }
633
634 if (spin_trylock(&mvotg->wq_lock)) {
635 mv_otg_run_state_machine(mvotg, 0);
636 spin_unlock(&mvotg->wq_lock);
637 }
638
639 return count;
640}
641
642static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
643 get_a_bus_drop, set_a_bus_drop);
644
645static struct attribute *inputs_attrs[] = {
646 &dev_attr_a_bus_req.attr,
647 &dev_attr_a_clr_err.attr,
648 &dev_attr_a_bus_drop.attr,
649 NULL,
650};
651
652static struct attribute_group inputs_attr_group = {
653 .name = "inputs",
654 .attrs = inputs_attrs,
655};
656
657static int mv_otg_remove(struct platform_device *pdev)
658{
659 struct mv_otg *mvotg = platform_get_drvdata(pdev);
660
661 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
662
663 if (mvotg->qwork) {
664 flush_workqueue(mvotg->qwork);
665 destroy_workqueue(mvotg->qwork);
666 }
667
668 mv_otg_disable(mvotg);
669
670 usb_remove_phy(&mvotg->phy);
671
672 return 0;
673}
674
675static int mv_otg_probe(struct platform_device *pdev)
676{
677 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
678 struct mv_otg *mvotg;
679 struct usb_otg *otg;
680 struct resource *r;
681 int retval = 0, i;
682
683 if (pdata == NULL) {
684 dev_err(&pdev->dev, "failed to get platform data\n");
685 return -ENODEV;
686 }
687
688 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
689 if (!mvotg) {
690 dev_err(&pdev->dev, "failed to allocate memory!\n");
691 return -ENOMEM;
692 }
693
694 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
695 if (!otg)
696 return -ENOMEM;
697
698 platform_set_drvdata(pdev, mvotg);
699
700 mvotg->pdev = pdev;
701 mvotg->pdata = pdata;
702
703 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
704 if (IS_ERR(mvotg->clk))
705 return PTR_ERR(mvotg->clk);
706
707 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
708 if (!mvotg->qwork) {
709 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
710 return -ENOMEM;
711 }
712
713 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
714
715 /* OTG common part */
716 mvotg->pdev = pdev;
717 mvotg->phy.dev = &pdev->dev;
718 mvotg->phy.otg = otg;
719 mvotg->phy.label = driver_name;
720 mvotg->phy.state = OTG_STATE_UNDEFINED;
721
722 otg->phy = &mvotg->phy;
723 otg->set_host = mv_otg_set_host;
724 otg->set_peripheral = mv_otg_set_peripheral;
725 otg->set_vbus = mv_otg_set_vbus;
726
727 for (i = 0; i < OTG_TIMER_NUM; i++)
728 init_timer(&mvotg->otg_ctrl.timer[i]);
729
730 r = platform_get_resource_byname(mvotg->pdev,
731 IORESOURCE_MEM, "phyregs");
732 if (r == NULL) {
733 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
734 retval = -ENODEV;
735 goto err_destroy_workqueue;
736 }
737
738 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
739 if (mvotg->phy_regs == NULL) {
740 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
741 retval = -EFAULT;
742 goto err_destroy_workqueue;
743 }
744
745 r = platform_get_resource_byname(mvotg->pdev,
746 IORESOURCE_MEM, "capregs");
747 if (r == NULL) {
748 dev_err(&pdev->dev, "no I/O memory resource defined\n");
749 retval = -ENODEV;
750 goto err_destroy_workqueue;
751 }
752
753 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
754 if (mvotg->cap_regs == NULL) {
755 dev_err(&pdev->dev, "failed to map I/O memory\n");
756 retval = -EFAULT;
757 goto err_destroy_workqueue;
758 }
759
760 /* we will acces controller register, so enable the udc controller */
761 retval = mv_otg_enable_internal(mvotg);
762 if (retval) {
763 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
764 goto err_destroy_workqueue;
765 }
766
767 mvotg->op_regs =
768 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
769 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
770
771 if (pdata->id) {
772 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
773 NULL, mv_otg_inputs_irq,
774 IRQF_ONESHOT, "id", mvotg);
775 if (retval) {
776 dev_info(&pdev->dev,
777 "Failed to request irq for ID\n");
778 pdata->id = NULL;
779 }
780 }
781
782 if (pdata->vbus) {
783 mvotg->clock_gating = 1;
784 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
785 NULL, mv_otg_inputs_irq,
786 IRQF_ONESHOT, "vbus", mvotg);
787 if (retval) {
788 dev_info(&pdev->dev,
789 "Failed to request irq for VBUS, "
790 "disable clock gating\n");
791 mvotg->clock_gating = 0;
792 pdata->vbus = NULL;
793 }
794 }
795
796 if (pdata->disable_otg_clock_gating)
797 mvotg->clock_gating = 0;
798
799 mv_otg_reset(mvotg);
800 mv_otg_init_irq(mvotg);
801
802 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
803 if (r == NULL) {
804 dev_err(&pdev->dev, "no IRQ resource defined\n");
805 retval = -ENODEV;
806 goto err_disable_clk;
807 }
808
809 mvotg->irq = r->start;
810 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
811 driver_name, mvotg)) {
812 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
813 mvotg->irq);
814 mvotg->irq = 0;
815 retval = -ENODEV;
816 goto err_disable_clk;
817 }
818
819 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
820 if (retval < 0) {
821 dev_err(&pdev->dev, "can't register transceiver, %d\n",
822 retval);
823 goto err_disable_clk;
824 }
825
826 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
827 if (retval < 0) {
828 dev_dbg(&pdev->dev,
829 "Can't register sysfs attr group: %d\n", retval);
830 goto err_remove_phy;
831 }
832
833 spin_lock_init(&mvotg->wq_lock);
834 if (spin_trylock(&mvotg->wq_lock)) {
835 mv_otg_run_state_machine(mvotg, 2 * HZ);
836 spin_unlock(&mvotg->wq_lock);
837 }
838
839 dev_info(&pdev->dev,
840 "successful probe OTG device %s clock gating.\n",
841 mvotg->clock_gating ? "with" : "without");
842
843 return 0;
844
845err_remove_phy:
846 usb_remove_phy(&mvotg->phy);
847err_disable_clk:
848 mv_otg_disable_internal(mvotg);
849err_destroy_workqueue:
850 flush_workqueue(mvotg->qwork);
851 destroy_workqueue(mvotg->qwork);
852
853 return retval;
854}
855
856#ifdef CONFIG_PM
857static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
858{
859 struct mv_otg *mvotg = platform_get_drvdata(pdev);
860
861 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
862 dev_info(&pdev->dev,
863 "OTG state is not B_IDLE, it is %d!\n",
864 mvotg->phy.state);
865 return -EAGAIN;
866 }
867
868 if (!mvotg->clock_gating)
869 mv_otg_disable_internal(mvotg);
870
871 return 0;
872}
873
874static int mv_otg_resume(struct platform_device *pdev)
875{
876 struct mv_otg *mvotg = platform_get_drvdata(pdev);
877 u32 otgsc;
878
879 if (!mvotg->clock_gating) {
880 mv_otg_enable_internal(mvotg);
881
882 otgsc = readl(&mvotg->op_regs->otgsc);
883 otgsc |= mvotg->irq_en;
884 writel(otgsc, &mvotg->op_regs->otgsc);
885
886 if (spin_trylock(&mvotg->wq_lock)) {
887 mv_otg_run_state_machine(mvotg, 0);
888 spin_unlock(&mvotg->wq_lock);
889 }
890 }
891 return 0;
892}
893#endif
894
895static struct platform_driver mv_otg_driver = {
896 .probe = mv_otg_probe,
897 .remove = mv_otg_remove,
898 .driver = {
899 .owner = THIS_MODULE,
900 .name = driver_name,
901 },
902#ifdef CONFIG_PM
903 .suspend = mv_otg_suspend,
904 .resume = mv_otg_resume,
905#endif
906};
907module_platform_driver(mv_otg_driver);