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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/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);
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->usb_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 int old_state = mvotg->phy.otg->state;
342
343 switch (old_state) {
344 case OTG_STATE_UNDEFINED:
345 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
346 /* FALL THROUGH */
347 case OTG_STATE_B_IDLE:
348 if (otg_ctrl->id == 0)
349 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
350 else if (otg_ctrl->b_sess_vld)
351 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
352 break;
353 case OTG_STATE_B_PERIPHERAL:
354 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
355 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
356 break;
357 case OTG_STATE_A_IDLE:
358 if (otg_ctrl->id)
359 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
360 else if (!(otg_ctrl->a_bus_drop) &&
361 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
362 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
363 break;
364 case OTG_STATE_A_WAIT_VRISE:
365 if (otg_ctrl->a_vbus_vld)
366 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
367 break;
368 case OTG_STATE_A_WAIT_BCON:
369 if (otg_ctrl->id || otg_ctrl->a_bus_drop
370 || otg_ctrl->a_wait_bcon_timeout) {
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_WAIT_VFALL;
374 otg_ctrl->a_bus_req = 0;
375 } else if (!otg_ctrl->a_vbus_vld) {
376 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
377 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
378 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
379 } else if (otg_ctrl->b_conn) {
380 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
381 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
382 mvotg->phy.otg->state = OTG_STATE_A_HOST;
383 }
384 break;
385 case OTG_STATE_A_HOST:
386 if (otg_ctrl->id || !otg_ctrl->b_conn
387 || otg_ctrl->a_bus_drop)
388 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
389 else if (!otg_ctrl->a_vbus_vld)
390 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
391 break;
392 case OTG_STATE_A_WAIT_VFALL:
393 if (otg_ctrl->id
394 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
395 || otg_ctrl->a_bus_req)
396 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
397 break;
398 case OTG_STATE_A_VBUS_ERR:
399 if (otg_ctrl->id || otg_ctrl->a_clr_err
400 || otg_ctrl->a_bus_drop) {
401 otg_ctrl->a_clr_err = 0;
402 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
403 }
404 break;
405 default:
406 break;
407 }
408}
409
410static void mv_otg_work(struct work_struct *work)
411{
412 struct mv_otg *mvotg;
413 struct usb_phy *phy;
414 struct usb_otg *otg;
415 int old_state;
416
417 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
418
419run:
420 /* work queue is single thread, or we need spin_lock to protect */
421 phy = &mvotg->phy;
422 otg = mvotg->phy.otg;
423 old_state = otg->state;
424
425 if (!mvotg->active)
426 return;
427
428 mv_otg_update_inputs(mvotg);
429 mv_otg_update_state(mvotg);
430
431 if (old_state != mvotg->phy.otg->state) {
432 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
433 state_string[old_state],
434 state_string[mvotg->phy.otg->state]);
435
436 switch (mvotg->phy.otg->state) {
437 case OTG_STATE_B_IDLE:
438 otg->default_a = 0;
439 if (old_state == OTG_STATE_B_PERIPHERAL)
440 mv_otg_start_periphrals(mvotg, 0);
441 mv_otg_reset(mvotg);
442 mv_otg_disable(mvotg);
443 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
444 break;
445 case OTG_STATE_B_PERIPHERAL:
446 mv_otg_enable(mvotg);
447 mv_otg_start_periphrals(mvotg, 1);
448 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
449 break;
450 case OTG_STATE_A_IDLE:
451 otg->default_a = 1;
452 mv_otg_enable(mvotg);
453 if (old_state == OTG_STATE_A_WAIT_VFALL)
454 mv_otg_start_host(mvotg, 0);
455 mv_otg_reset(mvotg);
456 break;
457 case OTG_STATE_A_WAIT_VRISE:
458 mv_otg_set_vbus(otg, 1);
459 break;
460 case OTG_STATE_A_WAIT_BCON:
461 if (old_state != OTG_STATE_A_HOST)
462 mv_otg_start_host(mvotg, 1);
463 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
464 T_A_WAIT_BCON,
465 mv_otg_timer_await_bcon);
466 /*
467 * Now, we directly enter A_HOST. So set b_conn = 1
468 * here. In fact, it need host driver to notify us.
469 */
470 mvotg->otg_ctrl.b_conn = 1;
471 break;
472 case OTG_STATE_A_HOST:
473 break;
474 case OTG_STATE_A_WAIT_VFALL:
475 /*
476 * Now, we has exited A_HOST. So set b_conn = 0
477 * here. In fact, it need host driver to notify us.
478 */
479 mvotg->otg_ctrl.b_conn = 0;
480 mv_otg_set_vbus(otg, 0);
481 break;
482 case OTG_STATE_A_VBUS_ERR:
483 break;
484 default:
485 break;
486 }
487 goto run;
488 }
489}
490
491static irqreturn_t mv_otg_irq(int irq, void *dev)
492{
493 struct mv_otg *mvotg = dev;
494 u32 otgsc;
495
496 otgsc = readl(&mvotg->op_regs->otgsc);
497 writel(otgsc, &mvotg->op_regs->otgsc);
498
499 /*
500 * if we have vbus, then the vbus detection for B-device
501 * will be done by mv_otg_inputs_irq().
502 */
503 if (mvotg->pdata->vbus)
504 if ((otgsc & OTGSC_STS_USB_ID) &&
505 !(otgsc & OTGSC_INTSTS_USB_ID))
506 return IRQ_NONE;
507
508 if ((otgsc & mvotg->irq_status) == 0)
509 return IRQ_NONE;
510
511 mv_otg_run_state_machine(mvotg, 0);
512
513 return IRQ_HANDLED;
514}
515
516static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
517{
518 struct mv_otg *mvotg = dev;
519
520 /* The clock may disabled at this time */
521 if (!mvotg->active) {
522 mv_otg_enable(mvotg);
523 mv_otg_init_irq(mvotg);
524 }
525
526 mv_otg_run_state_machine(mvotg, 0);
527
528 return IRQ_HANDLED;
529}
530
531static ssize_t
532get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
533{
534 struct mv_otg *mvotg = dev_get_drvdata(dev);
535 return scnprintf(buf, PAGE_SIZE, "%d\n",
536 mvotg->otg_ctrl.a_bus_req);
537}
538
539static ssize_t
540set_a_bus_req(struct device *dev, struct device_attribute *attr,
541 const char *buf, size_t count)
542{
543 struct mv_otg *mvotg = dev_get_drvdata(dev);
544
545 if (count > 2)
546 return -1;
547
548 /* We will use this interface to change to A device */
549 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
550 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
551 return -1;
552
553 /* The clock may disabled and we need to set irq for ID detected */
554 mv_otg_enable(mvotg);
555 mv_otg_init_irq(mvotg);
556
557 if (buf[0] == '1') {
558 mvotg->otg_ctrl.a_bus_req = 1;
559 mvotg->otg_ctrl.a_bus_drop = 0;
560 dev_dbg(&mvotg->pdev->dev,
561 "User request: a_bus_req = 1\n");
562
563 if (spin_trylock(&mvotg->wq_lock)) {
564 mv_otg_run_state_machine(mvotg, 0);
565 spin_unlock(&mvotg->wq_lock);
566 }
567 }
568
569 return count;
570}
571
572static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
573 set_a_bus_req);
574
575static ssize_t
576set_a_clr_err(struct device *dev, struct device_attribute *attr,
577 const char *buf, size_t count)
578{
579 struct mv_otg *mvotg = dev_get_drvdata(dev);
580 if (!mvotg->phy.otg->default_a)
581 return -1;
582
583 if (count > 2)
584 return -1;
585
586 if (buf[0] == '1') {
587 mvotg->otg_ctrl.a_clr_err = 1;
588 dev_dbg(&mvotg->pdev->dev,
589 "User request: a_clr_err = 1\n");
590 }
591
592 if (spin_trylock(&mvotg->wq_lock)) {
593 mv_otg_run_state_machine(mvotg, 0);
594 spin_unlock(&mvotg->wq_lock);
595 }
596
597 return count;
598}
599
600static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
601
602static ssize_t
603get_a_bus_drop(struct device *dev, struct device_attribute *attr,
604 char *buf)
605{
606 struct mv_otg *mvotg = dev_get_drvdata(dev);
607 return scnprintf(buf, PAGE_SIZE, "%d\n",
608 mvotg->otg_ctrl.a_bus_drop);
609}
610
611static ssize_t
612set_a_bus_drop(struct device *dev, struct device_attribute *attr,
613 const char *buf, size_t count)
614{
615 struct mv_otg *mvotg = dev_get_drvdata(dev);
616 if (!mvotg->phy.otg->default_a)
617 return -1;
618
619 if (count > 2)
620 return -1;
621
622 if (buf[0] == '0') {
623 mvotg->otg_ctrl.a_bus_drop = 0;
624 dev_dbg(&mvotg->pdev->dev,
625 "User request: a_bus_drop = 0\n");
626 } else if (buf[0] == '1') {
627 mvotg->otg_ctrl.a_bus_drop = 1;
628 mvotg->otg_ctrl.a_bus_req = 0;
629 dev_dbg(&mvotg->pdev->dev,
630 "User request: a_bus_drop = 1\n");
631 dev_dbg(&mvotg->pdev->dev,
632 "User request: and a_bus_req = 0\n");
633 }
634
635 if (spin_trylock(&mvotg->wq_lock)) {
636 mv_otg_run_state_machine(mvotg, 0);
637 spin_unlock(&mvotg->wq_lock);
638 }
639
640 return count;
641}
642
643static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
644 get_a_bus_drop, set_a_bus_drop);
645
646static struct attribute *inputs_attrs[] = {
647 &dev_attr_a_bus_req.attr,
648 &dev_attr_a_clr_err.attr,
649 &dev_attr_a_bus_drop.attr,
650 NULL,
651};
652
653static struct attribute_group inputs_attr_group = {
654 .name = "inputs",
655 .attrs = inputs_attrs,
656};
657
658static int mv_otg_remove(struct platform_device *pdev)
659{
660 struct mv_otg *mvotg = platform_get_drvdata(pdev);
661
662 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
663
664 if (mvotg->qwork) {
665 flush_workqueue(mvotg->qwork);
666 destroy_workqueue(mvotg->qwork);
667 }
668
669 mv_otg_disable(mvotg);
670
671 usb_remove_phy(&mvotg->phy);
672
673 return 0;
674}
675
676static int mv_otg_probe(struct platform_device *pdev)
677{
678 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
679 struct mv_otg *mvotg;
680 struct usb_otg *otg;
681 struct resource *r;
682 int retval = 0, i;
683
684 if (pdata == NULL) {
685 dev_err(&pdev->dev, "failed to get platform data\n");
686 return -ENODEV;
687 }
688
689 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
690 if (!mvotg)
691 return -ENOMEM;
692
693 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
694 if (!otg)
695 return -ENOMEM;
696
697 platform_set_drvdata(pdev, mvotg);
698
699 mvotg->pdev = pdev;
700 mvotg->pdata = pdata;
701
702 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
703 if (IS_ERR(mvotg->clk))
704 return PTR_ERR(mvotg->clk);
705
706 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
707 if (!mvotg->qwork) {
708 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
709 return -ENOMEM;
710 }
711
712 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
713
714 /* OTG common part */
715 mvotg->pdev = pdev;
716 mvotg->phy.dev = &pdev->dev;
717 mvotg->phy.otg = otg;
718 mvotg->phy.label = driver_name;
719
720 otg->state = OTG_STATE_UNDEFINED;
721 otg->usb_phy = &mvotg->phy;
722 otg->set_host = mv_otg_set_host;
723 otg->set_peripheral = mv_otg_set_peripheral;
724 otg->set_vbus = mv_otg_set_vbus;
725
726 for (i = 0; i < OTG_TIMER_NUM; i++)
727 init_timer(&mvotg->otg_ctrl.timer[i]);
728
729 r = platform_get_resource_byname(mvotg->pdev,
730 IORESOURCE_MEM, "phyregs");
731 if (r == NULL) {
732 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
733 retval = -ENODEV;
734 goto err_destroy_workqueue;
735 }
736
737 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
738 if (mvotg->phy_regs == NULL) {
739 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
740 retval = -EFAULT;
741 goto err_destroy_workqueue;
742 }
743
744 r = platform_get_resource_byname(mvotg->pdev,
745 IORESOURCE_MEM, "capregs");
746 if (r == NULL) {
747 dev_err(&pdev->dev, "no I/O memory resource defined\n");
748 retval = -ENODEV;
749 goto err_destroy_workqueue;
750 }
751
752 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
753 if (mvotg->cap_regs == NULL) {
754 dev_err(&pdev->dev, "failed to map I/O memory\n");
755 retval = -EFAULT;
756 goto err_destroy_workqueue;
757 }
758
759 /* we will acces controller register, so enable the udc controller */
760 retval = mv_otg_enable_internal(mvotg);
761 if (retval) {
762 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
763 goto err_destroy_workqueue;
764 }
765
766 mvotg->op_regs =
767 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
768 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
769
770 if (pdata->id) {
771 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
772 NULL, mv_otg_inputs_irq,
773 IRQF_ONESHOT, "id", mvotg);
774 if (retval) {
775 dev_info(&pdev->dev,
776 "Failed to request irq for ID\n");
777 pdata->id = NULL;
778 }
779 }
780
781 if (pdata->vbus) {
782 mvotg->clock_gating = 1;
783 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
784 NULL, mv_otg_inputs_irq,
785 IRQF_ONESHOT, "vbus", mvotg);
786 if (retval) {
787 dev_info(&pdev->dev,
788 "Failed to request irq for VBUS, "
789 "disable clock gating\n");
790 mvotg->clock_gating = 0;
791 pdata->vbus = NULL;
792 }
793 }
794
795 if (pdata->disable_otg_clock_gating)
796 mvotg->clock_gating = 0;
797
798 mv_otg_reset(mvotg);
799 mv_otg_init_irq(mvotg);
800
801 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
802 if (r == NULL) {
803 dev_err(&pdev->dev, "no IRQ resource defined\n");
804 retval = -ENODEV;
805 goto err_disable_clk;
806 }
807
808 mvotg->irq = r->start;
809 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
810 driver_name, mvotg)) {
811 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
812 mvotg->irq);
813 mvotg->irq = 0;
814 retval = -ENODEV;
815 goto err_disable_clk;
816 }
817
818 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
819 if (retval < 0) {
820 dev_err(&pdev->dev, "can't register transceiver, %d\n",
821 retval);
822 goto err_disable_clk;
823 }
824
825 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
826 if (retval < 0) {
827 dev_dbg(&pdev->dev,
828 "Can't register sysfs attr group: %d\n", retval);
829 goto err_remove_phy;
830 }
831
832 spin_lock_init(&mvotg->wq_lock);
833 if (spin_trylock(&mvotg->wq_lock)) {
834 mv_otg_run_state_machine(mvotg, 2 * HZ);
835 spin_unlock(&mvotg->wq_lock);
836 }
837
838 dev_info(&pdev->dev,
839 "successful probe OTG device %s clock gating.\n",
840 mvotg->clock_gating ? "with" : "without");
841
842 return 0;
843
844err_remove_phy:
845 usb_remove_phy(&mvotg->phy);
846err_disable_clk:
847 mv_otg_disable_internal(mvotg);
848err_destroy_workqueue:
849 flush_workqueue(mvotg->qwork);
850 destroy_workqueue(mvotg->qwork);
851
852 return retval;
853}
854
855#ifdef CONFIG_PM
856static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
857{
858 struct mv_otg *mvotg = platform_get_drvdata(pdev);
859
860 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
861 dev_info(&pdev->dev,
862 "OTG state is not B_IDLE, it is %d!\n",
863 mvotg->phy.otg->state);
864 return -EAGAIN;
865 }
866
867 if (!mvotg->clock_gating)
868 mv_otg_disable_internal(mvotg);
869
870 return 0;
871}
872
873static int mv_otg_resume(struct platform_device *pdev)
874{
875 struct mv_otg *mvotg = platform_get_drvdata(pdev);
876 u32 otgsc;
877
878 if (!mvotg->clock_gating) {
879 mv_otg_enable_internal(mvotg);
880
881 otgsc = readl(&mvotg->op_regs->otgsc);
882 otgsc |= mvotg->irq_en;
883 writel(otgsc, &mvotg->op_regs->otgsc);
884
885 if (spin_trylock(&mvotg->wq_lock)) {
886 mv_otg_run_state_machine(mvotg, 0);
887 spin_unlock(&mvotg->wq_lock);
888 }
889 }
890 return 0;
891}
892#endif
893
894static struct platform_driver mv_otg_driver = {
895 .probe = mv_otg_probe,
896 .remove = mv_otg_remove,
897 .driver = {
898 .name = driver_name,
899 },
900#ifdef CONFIG_PM
901 .suspend = mv_otg_suspend,
902 .resume = mv_otg_resume,
903#endif
904};
905module_platform_driver(mv_otg_driver);