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usb: move the OTG state from the USB PHY to the OTG structure
[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>
277164f0
NZ		 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
94ae9843 29#include "phy-mv-usb.h"
277164f0
NZ		 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
b1c711d6 57static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
277164f0 58{
b1c711d6 59 struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
277164f0
NZ		 60 if (mvotg->pdata->set_vbus == NULL)
61 return -ENODEV;
62
63 return mvotg->pdata->set_vbus(on);
64}
65
b1c711d6 66static int mv_otg_set_host(struct usb_otg *otg,
277164f0
NZ		 67 struct usb_bus *host)
68{
69 otg->host = host;
70
71 return 0;
72}
73
b1c711d6 74static int mv_otg_set_peripheral(struct usb_otg *otg,
277164f0
NZ		 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{
2053c2d1 204#ifdef CONFIG_USB
b1c711d6 205 struct usb_otg *otg = mvotg->phy.otg;
277164f0
NZ		 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
3c9740a1 215 if (on) {
277164f0 216 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
3c9740a1
PC		 217 device_wakeup_enable(hcd->self.controller);
218 } else {
277164f0 219 usb_remove_hcd(hcd);
3c9740a1 220 }
2053c2d1 221#endif /* CONFIG_USB */
277164f0
NZ		 222}
223
224static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
225{
b1c711d6 226 struct usb_otg *otg = mvotg->phy.otg;
277164f0
NZ		 227
228 if (!otg->gadget)
229 return;
230
b1c711d6 231 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
277164f0
NZ		 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{
df18feda 241 clk_prepare_enable(mvotg->clk);
277164f0
NZ		 242}
243
244static void otg_clock_disable(struct mv_otg *mvotg)
245{
df18feda 246 clk_disable_unprepare(mvotg->clk);
277164f0
NZ		 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;
b1c711d6 341 struct usb_phy *phy = &mvotg->phy;
e47d9254 342 int old_state = mvotg->phy.otg->state;
277164f0
NZ		 343
344 switch (old_state) {
345 case OTG_STATE_UNDEFINED:
e47d9254 346 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
277164f0
NZ		 347 /* FALL THROUGH */
348 case OTG_STATE_B_IDLE:
349 if (otg_ctrl->id == 0)
e47d9254 350 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
277164f0 351 else if (otg_ctrl->b_sess_vld)
e47d9254 352 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
277164f0
NZ		 353 break;
354 case OTG_STATE_B_PERIPHERAL:
355 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
e47d9254 356 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
277164f0
NZ		 357 break;
358 case OTG_STATE_A_IDLE:
359 if (otg_ctrl->id)
e47d9254 360 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
277164f0
NZ		 361 else if (!(otg_ctrl->a_bus_drop) &&
362 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
e47d9254 363 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
277164f0
NZ		 364 break;
365 case OTG_STATE_A_WAIT_VRISE:
366 if (otg_ctrl->a_vbus_vld)
e47d9254 367 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
277164f0
NZ		 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;
e47d9254 374 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
277164f0
NZ		 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;
e47d9254 379 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
277164f0
NZ		 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;
e47d9254 383 mvotg->phy.otg->state = OTG_STATE_A_HOST;
277164f0
NZ		 384 }
385 break;
386 case OTG_STATE_A_HOST:
387 if (otg_ctrl->id || !otg_ctrl->b_conn
388 || otg_ctrl->a_bus_drop)
e47d9254 389 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
277164f0 390 else if (!otg_ctrl->a_vbus_vld)
e47d9254 391 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
277164f0
NZ		 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)
e47d9254 397 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
277164f0
NZ		 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;
e47d9254 403 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
277164f0
NZ		 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;
b1c711d6
HK		 414 struct usb_phy *phy;
415 struct usb_otg *otg;
277164f0
NZ		 416 int old_state;
417
63a13079 418 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
277164f0
NZ		 419
420run:
421 /* work queue is single thread, or we need spin_lock to protect */
b1c711d6 422 phy = &mvotg->phy;
e47d9254
AT		 423 otg = mvotg->phy.otg;
424 old_state = otg->state;
277164f0
NZ		 425
426 if (!mvotg->active)
427 return;
428
429 mv_otg_update_inputs(mvotg);
430 mv_otg_update_state(mvotg);
431
e47d9254 432 if (old_state != mvotg->phy.otg->state) {
277164f0
NZ		 433 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
434 state_string[old_state],
e47d9254 435 state_string[mvotg->phy.otg->state]);
277164f0 436
e47d9254 437 switch (mvotg->phy.otg->state) {
277164f0 438 case OTG_STATE_B_IDLE:
b1c711d6 439 otg->default_a = 0;
277164f0
NZ		 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:
b1c711d6 450 otg->default_a = 1;
277164f0
NZ		 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:
b1c711d6 457 mv_otg_set_vbus(otg, 1);
277164f0
NZ		 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;
b1c711d6 479 mv_otg_set_vbus(otg, 0);
277164f0
NZ		 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 */
e47d9254
AT		 548 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
549 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
277164f0
NZ		 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);
b1c711d6 579 if (!mvotg->phy.otg->default_a)
277164f0
NZ		 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);
b1c711d6 615 if (!mvotg->phy.otg->default_a)
277164f0
NZ		 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
d07f4a82 657static int mv_otg_remove(struct platform_device *pdev)
277164f0
NZ		 658{
659 struct mv_otg *mvotg = platform_get_drvdata(pdev);
277164f0
NZ		 660
661 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
662
277164f0
NZ		 663 if (mvotg->qwork) {
664 flush_workqueue(mvotg->qwork);
665 destroy_workqueue(mvotg->qwork);
666 }
667
668 mv_otg_disable(mvotg);
669
662dca54 670 usb_remove_phy(&mvotg->phy);
277164f0 671
277164f0
NZ		 672 return 0;
673}
674
675static int mv_otg_probe(struct platform_device *pdev)
676{
19f9e188 677 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
277164f0 678 struct mv_otg *mvotg;
b1c711d6 679 struct usb_otg *otg;
277164f0 680 struct resource *r;
df18feda 681 int retval = 0, i;
277164f0
NZ		 682
683 if (pdata == NULL) {
684 dev_err(&pdev->dev, "failed to get platform data\n");
685 return -ENODEV;
686 }
687
df18feda 688 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
aa10c7b0 689 if (!mvotg)
277164f0 690 return -ENOMEM;
277164f0 691
fb3dfe13
CX		 692 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
693 if (!otg)
b1c711d6 694 return -ENOMEM;
b1c711d6 695
277164f0
NZ		 696 platform_set_drvdata(pdev, mvotg);
697
698 mvotg->pdev = pdev;
699 mvotg->pdata = pdata;
700
df18feda
CX		 701 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
702 if (IS_ERR(mvotg->clk))
703 return PTR_ERR(mvotg->clk);
277164f0
NZ		 704
705 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
706 if (!mvotg->qwork) {
707 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
fb3dfe13 708 return -ENOMEM;
277164f0
NZ		 709 }
710
711 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
712
713 /* OTG common part */
714 mvotg->pdev = pdev;
b1c711d6
HK		 715 mvotg->phy.dev = &pdev->dev;
716 mvotg->phy.otg = otg;
717 mvotg->phy.label = driver_name;
b1c711d6
HK		 718
719 otg->phy = &mvotg->phy;
e47d9254 720 otg->state = OTG_STATE_UNDEFINED;
b1c711d6
HK		 721 otg->set_host = mv_otg_set_host;
722 otg->set_peripheral = mv_otg_set_peripheral;
723 otg->set_vbus = mv_otg_set_vbus;
277164f0
NZ		 724
725 for (i = 0; i < OTG_TIMER_NUM; i++)
726 init_timer(&mvotg->otg_ctrl.timer[i]);
727
728 r = platform_get_resource_byname(mvotg->pdev,
729 IORESOURCE_MEM, "phyregs");
730 if (r == NULL) {
731 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
732 retval = -ENODEV;
733 goto err_destroy_workqueue;
734 }
735
fb3dfe13 736 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
277164f0
NZ		 737 if (mvotg->phy_regs == NULL) {
738 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
739 retval = -EFAULT;
740 goto err_destroy_workqueue;
741 }
742
743 r = platform_get_resource_byname(mvotg->pdev,
744 IORESOURCE_MEM, "capregs");
745 if (r == NULL) {
746 dev_err(&pdev->dev, "no I/O memory resource defined\n");
747 retval = -ENODEV;
fb3dfe13 748 goto err_destroy_workqueue;
277164f0
NZ		 749 }
750
fb3dfe13 751 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
277164f0
NZ		 752 if (mvotg->cap_regs == NULL) {
753 dev_err(&pdev->dev, "failed to map I/O memory\n");
754 retval = -EFAULT;
fb3dfe13 755 goto err_destroy_workqueue;
277164f0
NZ		 756 }
757
758 /* we will acces controller register, so enable the udc controller */
759 retval = mv_otg_enable_internal(mvotg);
760 if (retval) {
761 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
fb3dfe13 762 goto err_destroy_workqueue;
277164f0
NZ		 763 }
764
765 mvotg->op_regs =
766 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
767 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
768
769 if (pdata->id) {
fb3dfe13
CX		 770 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
771 NULL, mv_otg_inputs_irq,
772 IRQF_ONESHOT, "id", mvotg);
277164f0
NZ		 773 if (retval) {
774 dev_info(&pdev->dev,
775 "Failed to request irq for ID\n");
776 pdata->id = NULL;
777 }
778 }
779
780 if (pdata->vbus) {
781 mvotg->clock_gating = 1;
fb3dfe13
CX		 782 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
783 NULL, mv_otg_inputs_irq,
784 IRQF_ONESHOT, "vbus", mvotg);
277164f0
NZ		 785 if (retval) {
786 dev_info(&pdev->dev,
787 "Failed to request irq for VBUS, "
788 "disable clock gating\n");
789 mvotg->clock_gating = 0;
790 pdata->vbus = NULL;
791 }
792 }
793
794 if (pdata->disable_otg_clock_gating)
795 mvotg->clock_gating = 0;
796
797 mv_otg_reset(mvotg);
798 mv_otg_init_irq(mvotg);
799
800 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
801 if (r == NULL) {
802 dev_err(&pdev->dev, "no IRQ resource defined\n");
803 retval = -ENODEV;
804 goto err_disable_clk;
805 }
806
807 mvotg->irq = r->start;
fb3dfe13 808 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
277164f0
NZ		 809 driver_name, mvotg)) {
810 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
811 mvotg->irq);
812 mvotg->irq = 0;
813 retval = -ENODEV;
814 goto err_disable_clk;
815 }
816
662dca54 817 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
277164f0
NZ		 818 if (retval < 0) {
819 dev_err(&pdev->dev, "can't register transceiver, %d\n",
820 retval);
fb3dfe13 821 goto err_disable_clk;
277164f0
NZ		 822 }
823
824 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
825 if (retval < 0) {
826 dev_dbg(&pdev->dev,
827 "Can't register sysfs attr group: %d\n", retval);
fb3dfe13 828 goto err_remove_phy;
277164f0
NZ		 829 }
830
831 spin_lock_init(&mvotg->wq_lock);
832 if (spin_trylock(&mvotg->wq_lock)) {
833 mv_otg_run_state_machine(mvotg, 2 * HZ);
834 spin_unlock(&mvotg->wq_lock);
835 }
836
837 dev_info(&pdev->dev,
838 "successful probe OTG device %s clock gating.\n",
839 mvotg->clock_gating ? "with" : "without");
840
841 return 0;
842
fb3dfe13 843err_remove_phy:
662dca54 844 usb_remove_phy(&mvotg->phy);
277164f0 845err_disable_clk:
277164f0 846 mv_otg_disable_internal(mvotg);
277164f0
NZ		 847err_destroy_workqueue:
848 flush_workqueue(mvotg->qwork);
849 destroy_workqueue(mvotg->qwork);
277164f0 850
277164f0
NZ		 851 return retval;
852}
853
854#ifdef CONFIG_PM
855static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
856{
857 struct mv_otg *mvotg = platform_get_drvdata(pdev);
858
b1c711d6 859 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
277164f0
NZ		 860 dev_info(&pdev->dev,
861 "OTG state is not B_IDLE, it is %d!\n",
b1c711d6 862 mvotg->phy.state);
277164f0
NZ		 863 return -EAGAIN;
864 }
865
866 if (!mvotg->clock_gating)
867 mv_otg_disable_internal(mvotg);
868
869 return 0;
870}
871
872static int mv_otg_resume(struct platform_device *pdev)
873{
874 struct mv_otg *mvotg = platform_get_drvdata(pdev);
875 u32 otgsc;
876
877 if (!mvotg->clock_gating) {
878 mv_otg_enable_internal(mvotg);
879
880 otgsc = readl(&mvotg->op_regs->otgsc);
881 otgsc |= mvotg->irq_en;
882 writel(otgsc, &mvotg->op_regs->otgsc);
883
884 if (spin_trylock(&mvotg->wq_lock)) {
885 mv_otg_run_state_machine(mvotg, 0);
886 spin_unlock(&mvotg->wq_lock);
887 }
888 }
889 return 0;
890}
891#endif
892
893static struct platform_driver mv_otg_driver = {
894 .probe = mv_otg_probe,
d07f4a82 895 .remove = mv_otg_remove,
277164f0
NZ		 896 .driver = {
897 .owner = THIS_MODULE,
898 .name = driver_name,
899 },
900#ifdef CONFIG_PM
901 .suspend = mv_otg_suspend,
902 .resume = mv_otg_resume,
903#endif
904};
ca21dda6 905module_platform_driver(mv_otg_driver);
Linux kernel - Deliverables
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