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usb: chipidea: usbmisc: Add support for i.MX51 CPU
[deliverable/linux.git] / drivers / usb / phy / phy-mv-usb.c
CommitLineData
277164f0
NZ		 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/init.h>
15#include <linux/io.h>
16#include <linux/uaccess.h>
17#include <linux/device.h>
18#include <linux/proc_fs.h>
19#include <linux/clk.h>
20#include <linux/workqueue.h>
21#include <linux/platform_device.h>
22
23#include <linux/usb.h>
24#include <linux/usb/ch9.h>
25#include <linux/usb/otg.h>
26#include <linux/usb/gadget.h>
27#include <linux/usb/hcd.h>
28#include <linux/platform_data/mv_usb.h>
29
94ae9843 30#include "phy-mv-usb.h"
277164f0
NZ		 31
32#define DRIVER_DESC "Marvell USB OTG transceiver driver"
33#define DRIVER_VERSION "Jan 20, 2010"
34
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_VERSION(DRIVER_VERSION);
37MODULE_LICENSE("GPL");
38
39static const char driver_name[] = "mv-otg";
40
41static char *state_string[] = {
42 "undefined",
43 "b_idle",
44 "b_srp_init",
45 "b_peripheral",
46 "b_wait_acon",
47 "b_host",
48 "a_idle",
49 "a_wait_vrise",
50 "a_wait_bcon",
51 "a_host",
52 "a_suspend",
53 "a_peripheral",
54 "a_wait_vfall",
55 "a_vbus_err"
56};
57
b1c711d6 58static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
277164f0 59{
b1c711d6 60 struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
277164f0
NZ		 61 if (mvotg->pdata->set_vbus == NULL)
62 return -ENODEV;
63
64 return mvotg->pdata->set_vbus(on);
65}
66
b1c711d6 67static int mv_otg_set_host(struct usb_otg *otg,
277164f0
NZ		 68 struct usb_bus *host)
69{
70 otg->host = host;
71
72 return 0;
73}
74
b1c711d6 75static int mv_otg_set_peripheral(struct usb_otg *otg,
277164f0
NZ		 76 struct usb_gadget *gadget)
77{
78 otg->gadget = gadget;
79
80 return 0;
81}
82
83static void mv_otg_run_state_machine(struct mv_otg *mvotg,
84 unsigned long delay)
85{
86 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
87 if (!mvotg->qwork)
88 return;
89
90 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
91}
92
93static void mv_otg_timer_await_bcon(unsigned long data)
94{
95 struct mv_otg *mvotg = (struct mv_otg *) data;
96
97 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
98
99 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
100
101 if (spin_trylock(&mvotg->wq_lock)) {
102 mv_otg_run_state_machine(mvotg, 0);
103 spin_unlock(&mvotg->wq_lock);
104 }
105}
106
107static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
108{
109 struct timer_list *timer;
110
111 if (id >= OTG_TIMER_NUM)
112 return -EINVAL;
113
114 timer = &mvotg->otg_ctrl.timer[id];
115
116 if (timer_pending(timer))
117 del_timer(timer);
118
119 return 0;
120}
121
122static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
123 unsigned long interval,
124 void (*callback) (unsigned long))
125{
126 struct timer_list *timer;
127
128 if (id >= OTG_TIMER_NUM)
129 return -EINVAL;
130
131 timer = &mvotg->otg_ctrl.timer[id];
132 if (timer_pending(timer)) {
133 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
134 return -EBUSY;
135 }
136
137 init_timer(timer);
138 timer->data = (unsigned long) mvotg;
139 timer->function = callback;
140 timer->expires = jiffies + interval;
141 add_timer(timer);
142
143 return 0;
144}
145
146static int mv_otg_reset(struct mv_otg *mvotg)
147{
148 unsigned int loops;
149 u32 tmp;
150
151 /* Stop the controller */
152 tmp = readl(&mvotg->op_regs->usbcmd);
153 tmp &= ~USBCMD_RUN_STOP;
154 writel(tmp, &mvotg->op_regs->usbcmd);
155
156 /* Reset the controller to get default values */
157 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
158
159 loops = 500;
160 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
161 if (loops == 0) {
162 dev_err(&mvotg->pdev->dev,
163 "Wait for RESET completed TIMEOUT\n");
164 return -ETIMEDOUT;
165 }
166 loops--;
167 udelay(20);
168 }
169
170 writel(0x0, &mvotg->op_regs->usbintr);
171 tmp = readl(&mvotg->op_regs->usbsts);
172 writel(tmp, &mvotg->op_regs->usbsts);
173
174 return 0;
175}
176
177static void mv_otg_init_irq(struct mv_otg *mvotg)
178{
179 u32 otgsc;
180
181 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
182 | OTGSC_INTR_A_VBUS_VALID;
183 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
184 | OTGSC_INTSTS_A_VBUS_VALID;
185
186 if (mvotg->pdata->vbus == NULL) {
187 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
188 | OTGSC_INTR_B_SESSION_END;
189 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
190 | OTGSC_INTSTS_B_SESSION_END;
191 }
192
193 if (mvotg->pdata->id == NULL) {
194 mvotg->irq_en |= OTGSC_INTR_USB_ID;
195 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
196 }
197
198 otgsc = readl(&mvotg->op_regs->otgsc);
199 otgsc |= mvotg->irq_en;
200 writel(otgsc, &mvotg->op_regs->otgsc);
201}
202
203static void mv_otg_start_host(struct mv_otg *mvotg, int on)
204{
2053c2d1 205#ifdef CONFIG_USB
b1c711d6 206 struct usb_otg *otg = mvotg->phy.otg;
277164f0
NZ		 207 struct usb_hcd *hcd;
208
209 if (!otg->host)
210 return;
211
212 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
213
214 hcd = bus_to_hcd(otg->host);
215
216 if (on)
217 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
218 else
219 usb_remove_hcd(hcd);
2053c2d1 220#endif /* CONFIG_USB */
277164f0
NZ		 221}
222
223static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
224{
b1c711d6 225 struct usb_otg *otg = mvotg->phy.otg;
277164f0
NZ		 226
227 if (!otg->gadget)
228 return;
229
b1c711d6 230 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
277164f0
NZ		 231
232 if (on)
233 usb_gadget_vbus_connect(otg->gadget);
234 else
235 usb_gadget_vbus_disconnect(otg->gadget);
236}
237
238static void otg_clock_enable(struct mv_otg *mvotg)
239{
df18feda 240 clk_prepare_enable(mvotg->clk);
277164f0
NZ		 241}
242
243static void otg_clock_disable(struct mv_otg *mvotg)
244{
df18feda 245 clk_disable_unprepare(mvotg->clk);
277164f0
NZ		 246}
247
248static int mv_otg_enable_internal(struct mv_otg *mvotg)
249{
250 int retval = 0;
251
252 if (mvotg->active)
253 return 0;
254
255 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
256
257 otg_clock_enable(mvotg);
258 if (mvotg->pdata->phy_init) {
259 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
260 if (retval) {
261 dev_err(&mvotg->pdev->dev,
262 "init phy error %d\n", retval);
263 otg_clock_disable(mvotg);
264 return retval;
265 }
266 }
267 mvotg->active = 1;
268
269 return 0;
270
271}
272
273static int mv_otg_enable(struct mv_otg *mvotg)
274{
275 if (mvotg->clock_gating)
276 return mv_otg_enable_internal(mvotg);
277
278 return 0;
279}
280
281static void mv_otg_disable_internal(struct mv_otg *mvotg)
282{
283 if (mvotg->active) {
284 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
285 if (mvotg->pdata->phy_deinit)
286 mvotg->pdata->phy_deinit(mvotg->phy_regs);
287 otg_clock_disable(mvotg);
288 mvotg->active = 0;
289 }
290}
291
292static void mv_otg_disable(struct mv_otg *mvotg)
293{
294 if (mvotg->clock_gating)
295 mv_otg_disable_internal(mvotg);
296}
297
298static void mv_otg_update_inputs(struct mv_otg *mvotg)
299{
300 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
301 u32 otgsc;
302
303 otgsc = readl(&mvotg->op_regs->otgsc);
304
305 if (mvotg->pdata->vbus) {
306 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
307 otg_ctrl->b_sess_vld = 1;
308 otg_ctrl->b_sess_end = 0;
309 } else {
310 otg_ctrl->b_sess_vld = 0;
311 otg_ctrl->b_sess_end = 1;
312 }
313 } else {
314 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
315 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
316 }
317
318 if (mvotg->pdata->id)
319 otg_ctrl->id = !!mvotg->pdata->id->poll();
320 else
321 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
322
323 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
324 otg_ctrl->a_bus_req = 1;
325
326 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
327 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
328
329 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
330 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
331 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
332 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
333 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
334 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
335}
336
337static void mv_otg_update_state(struct mv_otg *mvotg)
338{
339 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
b1c711d6
HK		 340 struct usb_phy *phy = &mvotg->phy;
341 int old_state = phy->state;
277164f0
NZ		 342
343 switch (old_state) {
344 case OTG_STATE_UNDEFINED:
b1c711d6 345 phy->state = OTG_STATE_B_IDLE;
277164f0
NZ		 346 /* FALL THROUGH */
347 case OTG_STATE_B_IDLE:
348 if (otg_ctrl->id == 0)
b1c711d6 349 phy->state = OTG_STATE_A_IDLE;
277164f0 350 else if (otg_ctrl->b_sess_vld)
b1c711d6 351 phy->state = OTG_STATE_B_PERIPHERAL;
277164f0
NZ		 352 break;
353 case OTG_STATE_B_PERIPHERAL:
354 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
b1c711d6 355 phy->state = OTG_STATE_B_IDLE;
277164f0
NZ		 356 break;
357 case OTG_STATE_A_IDLE:
358 if (otg_ctrl->id)
b1c711d6 359 phy->state = OTG_STATE_B_IDLE;
277164f0
NZ		 360 else if (!(otg_ctrl->a_bus_drop) &&
361 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
b1c711d6 362 phy->state = OTG_STATE_A_WAIT_VRISE;
277164f0
NZ		 363 break;
364 case OTG_STATE_A_WAIT_VRISE:
365 if (otg_ctrl->a_vbus_vld)
b1c711d6 366 phy->state = OTG_STATE_A_WAIT_BCON;
277164f0
NZ		 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;
b1c711d6 373 phy->state = OTG_STATE_A_WAIT_VFALL;
277164f0
NZ		 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;
b1c711d6 378 phy->state = OTG_STATE_A_VBUS_ERR;
277164f0
NZ		 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;
b1c711d6 382 phy->state = OTG_STATE_A_HOST;
277164f0
NZ		 383 }
384 break;
385 case OTG_STATE_A_HOST:
386 if (otg_ctrl->id || !otg_ctrl->b_conn
387 || otg_ctrl->a_bus_drop)
b1c711d6 388 phy->state = OTG_STATE_A_WAIT_BCON;
277164f0 389 else if (!otg_ctrl->a_vbus_vld)
b1c711d6 390 phy->state = OTG_STATE_A_VBUS_ERR;
277164f0
NZ		 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)
b1c711d6 396 phy->state = OTG_STATE_A_IDLE;
277164f0
NZ		 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;
b1c711d6 402 phy->state = OTG_STATE_A_WAIT_VFALL;
277164f0
NZ		 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;
b1c711d6
HK		 413 struct usb_phy *phy;
414 struct usb_otg *otg;
277164f0
NZ		 415 int old_state;
416
63a13079 417 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
277164f0
NZ		 418
419run:
420 /* work queue is single thread, or we need spin_lock to protect */
b1c711d6
HK		 421 phy = &mvotg->phy;
422 otg = phy->otg;
423 old_state = phy->state;
277164f0
NZ		 424
425 if (!mvotg->active)
426 return;
427
428 mv_otg_update_inputs(mvotg);
429 mv_otg_update_state(mvotg);
430
b1c711d6 431 if (old_state != phy->state) {
277164f0
NZ		 432 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
433 state_string[old_state],
b1c711d6 434 state_string[phy->state]);
277164f0 435
b1c711d6 436 switch (phy->state) {
277164f0 437 case OTG_STATE_B_IDLE:
b1c711d6 438 otg->default_a = 0;
277164f0
NZ		 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 break;
444 case OTG_STATE_B_PERIPHERAL:
445 mv_otg_enable(mvotg);
446 mv_otg_start_periphrals(mvotg, 1);
447 break;
448 case OTG_STATE_A_IDLE:
b1c711d6 449 otg->default_a = 1;
277164f0
NZ		 450 mv_otg_enable(mvotg);
451 if (old_state == OTG_STATE_A_WAIT_VFALL)
452 mv_otg_start_host(mvotg, 0);
453 mv_otg_reset(mvotg);
454 break;
455 case OTG_STATE_A_WAIT_VRISE:
b1c711d6 456 mv_otg_set_vbus(otg, 1);
277164f0
NZ		 457 break;
458 case OTG_STATE_A_WAIT_BCON:
459 if (old_state != OTG_STATE_A_HOST)
460 mv_otg_start_host(mvotg, 1);
461 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
462 T_A_WAIT_BCON,
463 mv_otg_timer_await_bcon);
464 /*
465 * Now, we directly enter A_HOST. So set b_conn = 1
466 * here. In fact, it need host driver to notify us.
467 */
468 mvotg->otg_ctrl.b_conn = 1;
469 break;
470 case OTG_STATE_A_HOST:
471 break;
472 case OTG_STATE_A_WAIT_VFALL:
473 /*
474 * Now, we has exited A_HOST. So set b_conn = 0
475 * here. In fact, it need host driver to notify us.
476 */
477 mvotg->otg_ctrl.b_conn = 0;
b1c711d6 478 mv_otg_set_vbus(otg, 0);
277164f0
NZ		 479 break;
480 case OTG_STATE_A_VBUS_ERR:
481 break;
482 default:
483 break;
484 }
485 goto run;
486 }
487}
488
489static irqreturn_t mv_otg_irq(int irq, void *dev)
490{
491 struct mv_otg *mvotg = dev;
492 u32 otgsc;
493
494 otgsc = readl(&mvotg->op_regs->otgsc);
495 writel(otgsc, &mvotg->op_regs->otgsc);
496
497 /*
498 * if we have vbus, then the vbus detection for B-device
499 * will be done by mv_otg_inputs_irq().
500 */
501 if (mvotg->pdata->vbus)
502 if ((otgsc & OTGSC_STS_USB_ID) &&
503 !(otgsc & OTGSC_INTSTS_USB_ID))
504 return IRQ_NONE;
505
506 if ((otgsc & mvotg->irq_status) == 0)
507 return IRQ_NONE;
508
509 mv_otg_run_state_machine(mvotg, 0);
510
511 return IRQ_HANDLED;
512}
513
514static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
515{
516 struct mv_otg *mvotg = dev;
517
518 /* The clock may disabled at this time */
519 if (!mvotg->active) {
520 mv_otg_enable(mvotg);
521 mv_otg_init_irq(mvotg);
522 }
523
524 mv_otg_run_state_machine(mvotg, 0);
525
526 return IRQ_HANDLED;
527}
528
529static ssize_t
530get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
531{
532 struct mv_otg *mvotg = dev_get_drvdata(dev);
533 return scnprintf(buf, PAGE_SIZE, "%d\n",
534 mvotg->otg_ctrl.a_bus_req);
535}
536
537static ssize_t
538set_a_bus_req(struct device *dev, struct device_attribute *attr,
539 const char *buf, size_t count)
540{
541 struct mv_otg *mvotg = dev_get_drvdata(dev);
542
543 if (count > 2)
544 return -1;
545
546 /* We will use this interface to change to A device */
b1c711d6
HK		 547 if (mvotg->phy.state != OTG_STATE_B_IDLE
548 && mvotg->phy.state != OTG_STATE_A_IDLE)
277164f0
NZ		 549 return -1;
550
551 /* The clock may disabled and we need to set irq for ID detected */
552 mv_otg_enable(mvotg);
553 mv_otg_init_irq(mvotg);
554
555 if (buf[0] == '1') {
556 mvotg->otg_ctrl.a_bus_req = 1;
557 mvotg->otg_ctrl.a_bus_drop = 0;
558 dev_dbg(&mvotg->pdev->dev,
559 "User request: a_bus_req = 1\n");
560
561 if (spin_trylock(&mvotg->wq_lock)) {
562 mv_otg_run_state_machine(mvotg, 0);
563 spin_unlock(&mvotg->wq_lock);
564 }
565 }
566
567 return count;
568}
569
570static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
571 set_a_bus_req);
572
573static ssize_t
574set_a_clr_err(struct device *dev, struct device_attribute *attr,
575 const char *buf, size_t count)
576{
577 struct mv_otg *mvotg = dev_get_drvdata(dev);
b1c711d6 578 if (!mvotg->phy.otg->default_a)
277164f0
NZ		 579 return -1;
580
581 if (count > 2)
582 return -1;
583
584 if (buf[0] == '1') {
585 mvotg->otg_ctrl.a_clr_err = 1;
586 dev_dbg(&mvotg->pdev->dev,
587 "User request: a_clr_err = 1\n");
588 }
589
590 if (spin_trylock(&mvotg->wq_lock)) {
591 mv_otg_run_state_machine(mvotg, 0);
592 spin_unlock(&mvotg->wq_lock);
593 }
594
595 return count;
596}
597
598static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
599
600static ssize_t
601get_a_bus_drop(struct device *dev, struct device_attribute *attr,
602 char *buf)
603{
604 struct mv_otg *mvotg = dev_get_drvdata(dev);
605 return scnprintf(buf, PAGE_SIZE, "%d\n",
606 mvotg->otg_ctrl.a_bus_drop);
607}
608
609static ssize_t
610set_a_bus_drop(struct device *dev, struct device_attribute *attr,
611 const char *buf, size_t count)
612{
613 struct mv_otg *mvotg = dev_get_drvdata(dev);
b1c711d6 614 if (!mvotg->phy.otg->default_a)
277164f0
NZ		 615 return -1;
616
617 if (count > 2)
618 return -1;
619
620 if (buf[0] == '0') {
621 mvotg->otg_ctrl.a_bus_drop = 0;
622 dev_dbg(&mvotg->pdev->dev,
623 "User request: a_bus_drop = 0\n");
624 } else if (buf[0] == '1') {
625 mvotg->otg_ctrl.a_bus_drop = 1;
626 mvotg->otg_ctrl.a_bus_req = 0;
627 dev_dbg(&mvotg->pdev->dev,
628 "User request: a_bus_drop = 1\n");
629 dev_dbg(&mvotg->pdev->dev,
630 "User request: and a_bus_req = 0\n");
631 }
632
633 if (spin_trylock(&mvotg->wq_lock)) {
634 mv_otg_run_state_machine(mvotg, 0);
635 spin_unlock(&mvotg->wq_lock);
636 }
637
638 return count;
639}
640
641static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
642 get_a_bus_drop, set_a_bus_drop);
643
644static struct attribute *inputs_attrs[] = {
645 &dev_attr_a_bus_req.attr,
646 &dev_attr_a_clr_err.attr,
647 &dev_attr_a_bus_drop.attr,
648 NULL,
649};
650
651static struct attribute_group inputs_attr_group = {
652 .name = "inputs",
653 .attrs = inputs_attrs,
654};
655
d07f4a82 656static int mv_otg_remove(struct platform_device *pdev)
277164f0
NZ		 657{
658 struct mv_otg *mvotg = platform_get_drvdata(pdev);
277164f0
NZ		 659
660 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
661
277164f0
NZ		 662 if (mvotg->qwork) {
663 flush_workqueue(mvotg->qwork);
664 destroy_workqueue(mvotg->qwork);
665 }
666
667 mv_otg_disable(mvotg);
668
662dca54 669 usb_remove_phy(&mvotg->phy);
277164f0 670
277164f0
NZ		 671 return 0;
672}
673
674static int mv_otg_probe(struct platform_device *pdev)
675{
19f9e188 676 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
277164f0 677 struct mv_otg *mvotg;
b1c711d6 678 struct usb_otg *otg;
277164f0 679 struct resource *r;
df18feda 680 int retval = 0, i;
277164f0
NZ		 681
682 if (pdata == NULL) {
683 dev_err(&pdev->dev, "failed to get platform data\n");
684 return -ENODEV;
685 }
686
df18feda 687 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
277164f0
NZ		 688 if (!mvotg) {
689 dev_err(&pdev->dev, "failed to allocate memory!\n");
690 return -ENOMEM;
691 }
692
fb3dfe13
CX		 693 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
694 if (!otg)
b1c711d6 695 return -ENOMEM;
b1c711d6 696
277164f0
NZ		 697 platform_set_drvdata(pdev, mvotg);
698
699 mvotg->pdev = pdev;
700 mvotg->pdata = pdata;
701
df18feda
CX		 702 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
703 if (IS_ERR(mvotg->clk))
704 return PTR_ERR(mvotg->clk);
277164f0
NZ		 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");
fb3dfe13 709 return -ENOMEM;
277164f0
NZ		 710 }
711
712 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
713
714 /* OTG common part */
715 mvotg->pdev = pdev;
b1c711d6
HK		 716 mvotg->phy.dev = &pdev->dev;
717 mvotg->phy.otg = otg;
718 mvotg->phy.label = driver_name;
719 mvotg->phy.state = OTG_STATE_UNDEFINED;
720
721 otg->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;
277164f0
NZ		 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
fb3dfe13 737 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
277164f0
NZ		 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;
fb3dfe13 749 goto err_destroy_workqueue;
277164f0
NZ		 750 }
751
fb3dfe13 752 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
277164f0
NZ		 753 if (mvotg->cap_regs == NULL) {
754 dev_err(&pdev->dev, "failed to map I/O memory\n");
755 retval = -EFAULT;
fb3dfe13 756 goto err_destroy_workqueue;
277164f0
NZ		 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);
fb3dfe13 763 goto err_destroy_workqueue;
277164f0
NZ		 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) {
fb3dfe13
CX		 771 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
772 NULL, mv_otg_inputs_irq,
773 IRQF_ONESHOT, "id", mvotg);
277164f0
NZ		 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;
fb3dfe13
CX		 783 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
784 NULL, mv_otg_inputs_irq,
785 IRQF_ONESHOT, "vbus", mvotg);
277164f0
NZ		 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;
fb3dfe13 809 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
277164f0
NZ		 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
662dca54 818 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
277164f0
NZ		 819 if (retval < 0) {
820 dev_err(&pdev->dev, "can't register transceiver, %d\n",
821 retval);
fb3dfe13 822 goto err_disable_clk;
277164f0
NZ		 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);
fb3dfe13 829 goto err_remove_phy;
277164f0
NZ		 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
fb3dfe13 844err_remove_phy:
662dca54 845 usb_remove_phy(&mvotg->phy);
277164f0 846err_disable_clk:
277164f0 847 mv_otg_disable_internal(mvotg);
277164f0
NZ		 848err_destroy_workqueue:
849 flush_workqueue(mvotg->qwork);
850 destroy_workqueue(mvotg->qwork);
277164f0 851
277164f0
NZ		 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
b1c711d6 860 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
277164f0
NZ		 861 dev_info(&pdev->dev,
862 "OTG state is not B_IDLE, it is %d!\n",
b1c711d6 863 mvotg->phy.state);
277164f0
NZ		 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,
d07f4a82 896 .remove = mv_otg_remove,
277164f0
NZ		 897 .driver = {
898 .owner = THIS_MODULE,
899 .name = driver_name,
900 },
901#ifdef CONFIG_PM
902 .suspend = mv_otg_suspend,
903 .resume = mv_otg_resume,
904#endif
905};
ca21dda6 906module_platform_driver(mv_otg_driver);
Linux kernel - Deliverables
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