Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/phy/phy-mv-usb.c

  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 
 34 MODULE_DESCRIPTION(DRIVER_DESC);
 35 MODULE_VERSION(DRIVER_VERSION);
 36 MODULE_LICENSE("GPL");
 37 
 38 static const char driver_name[] = "mv-otg";
 39 
 40 static 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 
 57 static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
 58 {
 59         struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
 60         if (mvotg->pdata->set_vbus == NULL)
 61                 return -ENODEV;
 62 
 63         return mvotg->pdata->set_vbus(on);
 64 }
 65 
 66 static 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 
 74 static 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 
 82 static 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 
 92 static 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 
106 static 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 
121 static 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 
145 static 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 
176 static 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 
202 static 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 
224 static 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 
239 static void otg_clock_enable(struct mv_otg *mvotg)
240 {
241         clk_prepare_enable(mvotg->clk);
242 }
243 
244 static void otg_clock_disable(struct mv_otg *mvotg)
245 {
246         clk_disable_unprepare(mvotg->clk);
247 }
248 
249 static 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 
274 static 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 
282 static 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 
293 static void mv_otg_disable(struct mv_otg *mvotg)
294 {
295         if (mvotg->clock_gating)
296                 mv_otg_disable_internal(mvotg);
297 }
298 
299 static 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 
338 static void mv_otg_update_state(struct mv_otg *mvotg)
339 {
340         struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
341         struct usb_phy *phy = &mvotg->phy;
342         int old_state = phy->state;
343 
344         switch (old_state) {
345         case OTG_STATE_UNDEFINED:
346                 phy->state = OTG_STATE_B_IDLE;
347                 /* FALL THROUGH */
348         case OTG_STATE_B_IDLE:
349                 if (otg_ctrl->id == 0)
350                         phy->state = OTG_STATE_A_IDLE;
351                 else if (otg_ctrl->b_sess_vld)
352                         phy->state = OTG_STATE_B_PERIPHERAL;
353                 break;
354         case OTG_STATE_B_PERIPHERAL:
355                 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
356                         phy->state = OTG_STATE_B_IDLE;
357                 break;
358         case OTG_STATE_A_IDLE:
359                 if (otg_ctrl->id)
360                         phy->state = OTG_STATE_B_IDLE;
361                 else if (!(otg_ctrl->a_bus_drop) &&
362                          (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
363                         phy->state = OTG_STATE_A_WAIT_VRISE;
364                 break;
365         case OTG_STATE_A_WAIT_VRISE:
366                 if (otg_ctrl->a_vbus_vld)
367                         phy->state = OTG_STATE_A_WAIT_BCON;
368                 break;
369         case OTG_STATE_A_WAIT_BCON:
370                 if (otg_ctrl->id || otg_ctrl->a_bus_drop
371                     || otg_ctrl->a_wait_bcon_timeout) {
372                         mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
373                         mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
374                         phy->state = OTG_STATE_A_WAIT_VFALL;
375                         otg_ctrl->a_bus_req = 0;
376                 } else if (!otg_ctrl->a_vbus_vld) {
377                         mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
378                         mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
379                         phy->state = OTG_STATE_A_VBUS_ERR;
380                 } else if (otg_ctrl->b_conn) {
381                         mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
382                         mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
383                         phy->state = OTG_STATE_A_HOST;
384                 }
385                 break;
386         case OTG_STATE_A_HOST:
387                 if (otg_ctrl->id || !otg_ctrl->b_conn
388                     || otg_ctrl->a_bus_drop)
389                         phy->state = OTG_STATE_A_WAIT_BCON;
390                 else if (!otg_ctrl->a_vbus_vld)
391                         phy->state = OTG_STATE_A_VBUS_ERR;
392                 break;
393         case OTG_STATE_A_WAIT_VFALL:
394                 if (otg_ctrl->id
395                     || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
396                     || otg_ctrl->a_bus_req)
397                         phy->state = OTG_STATE_A_IDLE;
398                 break;
399         case OTG_STATE_A_VBUS_ERR:
400                 if (otg_ctrl->id || otg_ctrl->a_clr_err
401                     || otg_ctrl->a_bus_drop) {
402                         otg_ctrl->a_clr_err = 0;
403                         phy->state = OTG_STATE_A_WAIT_VFALL;
404                 }
405                 break;
406         default:
407                 break;
408         }
409 }
410 
411 static void mv_otg_work(struct work_struct *work)
412 {
413         struct mv_otg *mvotg;
414         struct usb_phy *phy;
415         struct usb_otg *otg;
416         int old_state;
417 
418         mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
419 
420 run:
421         /* work queue is single thread, or we need spin_lock to protect */
422         phy = &mvotg->phy;
423         otg = phy->otg;
424         old_state = phy->state;
425 
426         if (!mvotg->active)
427                 return;
428 
429         mv_otg_update_inputs(mvotg);
430         mv_otg_update_state(mvotg);
431 
432         if (old_state != phy->state) {
433                 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
434                          state_string[old_state],
435                          state_string[phy->state]);
436 
437                 switch (phy->state) {
438                 case OTG_STATE_B_IDLE:
439                         otg->default_a = 0;
440                         if (old_state == OTG_STATE_B_PERIPHERAL)
441                                 mv_otg_start_periphrals(mvotg, 0);
442                         mv_otg_reset(mvotg);
443                         mv_otg_disable(mvotg);
444                         break;
445                 case OTG_STATE_B_PERIPHERAL:
446                         mv_otg_enable(mvotg);
447                         mv_otg_start_periphrals(mvotg, 1);
448                         break;
449                 case OTG_STATE_A_IDLE:
450                         otg->default_a = 1;
451                         mv_otg_enable(mvotg);
452                         if (old_state == OTG_STATE_A_WAIT_VFALL)
453                                 mv_otg_start_host(mvotg, 0);
454                         mv_otg_reset(mvotg);
455                         break;
456                 case OTG_STATE_A_WAIT_VRISE:
457                         mv_otg_set_vbus(otg, 1);
458                         break;
459                 case OTG_STATE_A_WAIT_BCON:
460                         if (old_state != OTG_STATE_A_HOST)
461                                 mv_otg_start_host(mvotg, 1);
462                         mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
463                                          T_A_WAIT_BCON,
464                                          mv_otg_timer_await_bcon);
465                         /*
466                          * Now, we directly enter A_HOST. So set b_conn = 1
467                          * here. In fact, it need host driver to notify us.
468                          */
469                         mvotg->otg_ctrl.b_conn = 1;
470                         break;
471                 case OTG_STATE_A_HOST:
472                         break;
473                 case OTG_STATE_A_WAIT_VFALL:
474                         /*
475                          * Now, we has exited A_HOST. So set b_conn = 0
476                          * here. In fact, it need host driver to notify us.
477                          */
478                         mvotg->otg_ctrl.b_conn = 0;
479                         mv_otg_set_vbus(otg, 0);
480                         break;
481                 case OTG_STATE_A_VBUS_ERR:
482                         break;
483                 default:
484                         break;
485                 }
486                 goto run;
487         }
488 }
489 
490 static 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 
515 static 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 
530 static ssize_t
531 get_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 
538 static ssize_t
539 set_a_bus_req(struct device *dev, struct device_attribute *attr,
540               const char *buf, size_t count)
541 {
542         struct mv_otg *mvotg = dev_get_drvdata(dev);
543 
544         if (count > 2)
545                 return -1;
546 
547         /* We will use this interface to change to A device */
548         if (mvotg->phy.state != OTG_STATE_B_IDLE
549             && mvotg->phy.state != OTG_STATE_A_IDLE)
550                 return -1;
551 
552         /* The clock may disabled and we need to set irq for ID detected */
553         mv_otg_enable(mvotg);
554         mv_otg_init_irq(mvotg);
555 
556         if (buf[0] == '1') {
557                 mvotg->otg_ctrl.a_bus_req = 1;
558                 mvotg->otg_ctrl.a_bus_drop = 0;
559                 dev_dbg(&mvotg->pdev->dev,
560                         "User request: a_bus_req = 1\n");
561 
562                 if (spin_trylock(&mvotg->wq_lock)) {
563                         mv_otg_run_state_machine(mvotg, 0);
564                         spin_unlock(&mvotg->wq_lock);
565                 }
566         }
567 
568         return count;
569 }
570 
571 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
572                    set_a_bus_req);
573 
574 static ssize_t
575 set_a_clr_err(struct device *dev, struct device_attribute *attr,
576               const char *buf, size_t count)
577 {
578         struct mv_otg *mvotg = dev_get_drvdata(dev);
579         if (!mvotg->phy.otg->default_a)
580                 return -1;
581 
582         if (count > 2)
583                 return -1;
584 
585         if (buf[0] == '1') {
586                 mvotg->otg_ctrl.a_clr_err = 1;
587                 dev_dbg(&mvotg->pdev->dev,
588                         "User request: a_clr_err = 1\n");
589         }
590 
591         if (spin_trylock(&mvotg->wq_lock)) {
592                 mv_otg_run_state_machine(mvotg, 0);
593                 spin_unlock(&mvotg->wq_lock);
594         }
595 
596         return count;
597 }
598 
599 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
600 
601 static ssize_t
602 get_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 
610 static ssize_t
611 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
612                const char *buf, size_t count)
613 {
614         struct mv_otg *mvotg = dev_get_drvdata(dev);
615         if (!mvotg->phy.otg->default_a)
616                 return -1;
617 
618         if (count > 2)
619                 return -1;
620 
621         if (buf[0] == '') {
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 
642 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
643                    get_a_bus_drop, set_a_bus_drop);
644 
645 static 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 
652 static struct attribute_group inputs_attr_group = {
653         .name = "inputs",
654         .attrs = inputs_attrs,
655 };
656 
657 static int mv_otg_remove(struct platform_device *pdev)
658 {
659         struct mv_otg *mvotg = platform_get_drvdata(pdev);
660 
661         sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
662 
663         if (mvotg->qwork) {
664                 flush_workqueue(mvotg->qwork);
665                 destroy_workqueue(mvotg->qwork);
666         }
667 
668         mv_otg_disable(mvotg);
669 
670         usb_remove_phy(&mvotg->phy);
671 
672         return 0;
673 }
674 
675 static int mv_otg_probe(struct platform_device *pdev)
676 {
677         struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
678         struct mv_otg *mvotg;
679         struct usb_otg *otg;
680         struct resource *r;
681         int retval = 0, i;
682 
683         if (pdata == NULL) {
684                 dev_err(&pdev->dev, "failed to get platform data\n");
685                 return -ENODEV;
686         }
687 
688         mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
689         if (!mvotg) {
690                 dev_err(&pdev->dev, "failed to allocate memory!\n");
691                 return -ENOMEM;
692         }
693 
694         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
695         if (!otg)
696                 return -ENOMEM;
697 
698         platform_set_drvdata(pdev, mvotg);
699 
700         mvotg->pdev = pdev;
701         mvotg->pdata = pdata;
702 
703         mvotg->clk = devm_clk_get(&pdev->dev, NULL);
704         if (IS_ERR(mvotg->clk))
705                 return PTR_ERR(mvotg->clk);
706 
707         mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
708         if (!mvotg->qwork) {
709                 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
710                 return -ENOMEM;
711         }
712 
713         INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
714 
715         /* OTG common part */
716         mvotg->pdev = pdev;
717         mvotg->phy.dev = &pdev->dev;
718         mvotg->phy.otg = otg;
719         mvotg->phy.label = driver_name;
720         mvotg->phy.state = OTG_STATE_UNDEFINED;
721 
722         otg->phy = &mvotg->phy;
723         otg->set_host = mv_otg_set_host;
724         otg->set_peripheral = mv_otg_set_peripheral;
725         otg->set_vbus = mv_otg_set_vbus;
726 
727         for (i = 0; i < OTG_TIMER_NUM; i++)
728                 init_timer(&mvotg->otg_ctrl.timer[i]);
729 
730         r = platform_get_resource_byname(mvotg->pdev,
731                                          IORESOURCE_MEM, "phyregs");
732         if (r == NULL) {
733                 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
734                 retval = -ENODEV;
735                 goto err_destroy_workqueue;
736         }
737 
738         mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
739         if (mvotg->phy_regs == NULL) {
740                 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
741                 retval = -EFAULT;
742                 goto err_destroy_workqueue;
743         }
744 
745         r = platform_get_resource_byname(mvotg->pdev,
746                                          IORESOURCE_MEM, "capregs");
747         if (r == NULL) {
748                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
749                 retval = -ENODEV;
750                 goto err_destroy_workqueue;
751         }
752 
753         mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
754         if (mvotg->cap_regs == NULL) {
755                 dev_err(&pdev->dev, "failed to map I/O memory\n");
756                 retval = -EFAULT;
757                 goto err_destroy_workqueue;
758         }
759 
760         /* we will acces controller register, so enable the udc controller */
761         retval = mv_otg_enable_internal(mvotg);
762         if (retval) {
763                 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
764                 goto err_destroy_workqueue;
765         }
766 
767         mvotg->op_regs =
768                 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
769                         + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
770 
771         if (pdata->id) {
772                 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
773                                                 NULL, mv_otg_inputs_irq,
774                                                 IRQF_ONESHOT, "id", mvotg);
775                 if (retval) {
776                         dev_info(&pdev->dev,
777                                  "Failed to request irq for ID\n");
778                         pdata->id = NULL;
779                 }
780         }
781 
782         if (pdata->vbus) {
783                 mvotg->clock_gating = 1;
784                 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
785                                                 NULL, mv_otg_inputs_irq,
786                                                 IRQF_ONESHOT, "vbus", mvotg);
787                 if (retval) {
788                         dev_info(&pdev->dev,
789                                  "Failed to request irq for VBUS, "
790                                  "disable clock gating\n");
791                         mvotg->clock_gating = 0;
792                         pdata->vbus = NULL;
793                 }
794         }
795 
796         if (pdata->disable_otg_clock_gating)
797                 mvotg->clock_gating = 0;
798 
799         mv_otg_reset(mvotg);
800         mv_otg_init_irq(mvotg);
801 
802         r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
803         if (r == NULL) {
804                 dev_err(&pdev->dev, "no IRQ resource defined\n");
805                 retval = -ENODEV;
806                 goto err_disable_clk;
807         }
808 
809         mvotg->irq = r->start;
810         if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
811                         driver_name, mvotg)) {
812                 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
813                         mvotg->irq);
814                 mvotg->irq = 0;
815                 retval = -ENODEV;
816                 goto err_disable_clk;
817         }
818 
819         retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
820         if (retval < 0) {
821                 dev_err(&pdev->dev, "can't register transceiver, %d\n",
822                         retval);
823                 goto err_disable_clk;
824         }
825 
826         retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
827         if (retval < 0) {
828                 dev_dbg(&pdev->dev,
829                         "Can't register sysfs attr group: %d\n", retval);
830                 goto err_remove_phy;
831         }
832 
833         spin_lock_init(&mvotg->wq_lock);
834         if (spin_trylock(&mvotg->wq_lock)) {
835                 mv_otg_run_state_machine(mvotg, 2 * HZ);
836                 spin_unlock(&mvotg->wq_lock);
837         }
838 
839         dev_info(&pdev->dev,
840                  "successful probe OTG device %s clock gating.\n",
841                  mvotg->clock_gating ? "with" : "without");
842 
843         return 0;
844 
845 err_remove_phy:
846         usb_remove_phy(&mvotg->phy);
847 err_disable_clk:
848         mv_otg_disable_internal(mvotg);
849 err_destroy_workqueue:
850         flush_workqueue(mvotg->qwork);
851         destroy_workqueue(mvotg->qwork);
852 
853         return retval;
854 }
855 
856 #ifdef CONFIG_PM
857 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
858 {
859         struct mv_otg *mvotg = platform_get_drvdata(pdev);
860 
861         if (mvotg->phy.state != OTG_STATE_B_IDLE) {
862                 dev_info(&pdev->dev,
863                          "OTG state is not B_IDLE, it is %d!\n",
864                          mvotg->phy.state);
865                 return -EAGAIN;
866         }
867 
868         if (!mvotg->clock_gating)
869                 mv_otg_disable_internal(mvotg);
870 
871         return 0;
872 }
873 
874 static int mv_otg_resume(struct platform_device *pdev)
875 {
876         struct mv_otg *mvotg = platform_get_drvdata(pdev);
877         u32 otgsc;
878 
879         if (!mvotg->clock_gating) {
880                 mv_otg_enable_internal(mvotg);
881 
882                 otgsc = readl(&mvotg->op_regs->otgsc);
883                 otgsc |= mvotg->irq_en;
884                 writel(otgsc, &mvotg->op_regs->otgsc);
885 
886                 if (spin_trylock(&mvotg->wq_lock)) {
887                         mv_otg_run_state_machine(mvotg, 0);
888                         spin_unlock(&mvotg->wq_lock);
889                 }
890         }
891         return 0;
892 }
893 #endif
894 
895 static struct platform_driver mv_otg_driver = {
896         .probe = mv_otg_probe,
897         .remove = mv_otg_remove,
898         .driver = {
899                    .owner = THIS_MODULE,
900                    .name = driver_name,
901                    },
902 #ifdef CONFIG_PM
903         .suspend = mv_otg_suspend,
904         .resume = mv_otg_resume,
905 #endif
906 };
907 module_platform_driver(mv_otg_driver);
908 

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