Version:  2.0.40 2.2.26 2.4.37 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 3.19

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->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 
 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         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 
410 static 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 
419 run:
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 
491 static 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 
516 static 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 
531 static ssize_t
532 get_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 
539 static ssize_t
540 set_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 
572 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
573                    set_a_bus_req);
574 
575 static ssize_t
576 set_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 
600 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
601 
602 static ssize_t
603 get_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 
611 static ssize_t
612 set_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] == '') {
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 
643 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
644                    get_a_bus_drop, set_a_bus_drop);
645 
646 static 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 
653 static struct attribute_group inputs_attr_group = {
654         .name = "inputs",
655         .attrs = inputs_attrs,
656 };
657 
658 static 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 
676 static 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 
844 err_remove_phy:
845         usb_remove_phy(&mvotg->phy);
846 err_disable_clk:
847         mv_otg_disable_internal(mvotg);
848 err_destroy_workqueue:
849         flush_workqueue(mvotg->qwork);
850         destroy_workqueue(mvotg->qwork);
851 
852         return retval;
853 }
854 
855 #ifdef CONFIG_PM
856 static 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 
873 static 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 
894 static 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 };
905 module_platform_driver(mv_otg_driver);
906 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us