drivers/usb/otg/mv_otg.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/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
  30 #include "mv_otg.h"
  31
  32 #define DRIVER_DESC     "Marvell USB OTG transceiver driver"
  33 #define DRIVER_VERSION  "Jan 20, 2010"
  34
  35 MODULE_DESCRIPTION(DRIVER_DESC);
  36 MODULE_VERSION(DRIVER_VERSION);
  37 MODULE_LICENSE("GPL");
  38
  39 static const char driver_name[] = "mv-otg";
  40
  41 static 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
  58 static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
  59 {
  60         struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
  61         if (mvotg->pdata->set_vbus == NULL)
  62                 return -ENODEV;
  63
  64         return mvotg->pdata->set_vbus(on);
  65 }
  66
  67 static int mv_otg_set_host(struct usb_otg *otg,
  68                            struct usb_bus *host)
  69 {
  70         otg->host = host;
  71
  72         return 0;
  73 }
  74
  75 static int mv_otg_set_peripheral(struct usb_otg *otg,
  76                                  struct usb_gadget *gadget)
  77 {
  78         otg->gadget = gadget;
  79
  80         return 0;
  81 }
  82
  83 static 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
  93 static 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
 107 static 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
 122 static 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
 146 static 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
 177 static 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
 203 static void mv_otg_start_host(struct mv_otg *mvotg, int on)
 204 {
 205 #ifdef CONFIG_USB
 206         struct usb_otg *otg = mvotg->phy.otg;
 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);
 220 #endif /* CONFIG_USB */
 221 }
 222
 223 static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
 224 {
 225         struct usb_otg *otg = mvotg->phy.otg;
 226
 227         if (!otg->gadget)
 228                 return;
 229
 230         dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
 231
 232         if (on)
 233                 usb_gadget_vbus_connect(otg->gadget);
 234         else
 235                 usb_gadget_vbus_disconnect(otg->gadget);
 236 }
 237
 238 static void otg_clock_enable(struct mv_otg *mvotg)
 239 {
 240         unsigned int i;
 241
 242         for (i = 0; i < mvotg->clknum; i++)
 243                 clk_prepare_enable(mvotg->clk[i]);
 244 }
 245
 246 static void otg_clock_disable(struct mv_otg *mvotg)
 247 {
 248         unsigned int i;
 249
 250         for (i = 0; i < mvotg->clknum; i++)
 251                 clk_disable_unprepare(mvotg->clk[i]);
 252 }
 253
 254 static int mv_otg_enable_internal(struct mv_otg *mvotg)
 255 {
 256         int retval = 0;
 257
 258         if (mvotg->active)
 259                 return 0;
 260
 261         dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
 262
 263         otg_clock_enable(mvotg);
 264         if (mvotg->pdata->phy_init) {
 265                 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
 266                 if (retval) {
 267                         dev_err(&mvotg->pdev->dev,
 268                                 "init phy error %d\n", retval);
 269                         otg_clock_disable(mvotg);
 270                         return retval;
 271                 }
 272         }
 273         mvotg->active = 1;
 274
 275         return 0;
 276
 277 }
 278
 279 static int mv_otg_enable(struct mv_otg *mvotg)
 280 {
 281         if (mvotg->clock_gating)
 282                 return mv_otg_enable_internal(mvotg);
 283
 284         return 0;
 285 }
 286
 287 static void mv_otg_disable_internal(struct mv_otg *mvotg)
 288 {
 289         if (mvotg->active) {
 290                 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
 291                 if (mvotg->pdata->phy_deinit)
 292                         mvotg->pdata->phy_deinit(mvotg->phy_regs);
 293                 otg_clock_disable(mvotg);
 294                 mvotg->active = 0;
 295         }
 296 }
 297
 298 static void mv_otg_disable(struct mv_otg *mvotg)
 299 {
 300         if (mvotg->clock_gating)
 301                 mv_otg_disable_internal(mvotg);
 302 }
 303
 304 static void mv_otg_update_inputs(struct mv_otg *mvotg)
 305 {
 306         struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
 307         u32 otgsc;
 308
 309         otgsc = readl(&mvotg->op_regs->otgsc);
 310
 311         if (mvotg->pdata->vbus) {
 312                 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
 313                         otg_ctrl->b_sess_vld = 1;
 314                         otg_ctrl->b_sess_end = 0;
 315                 } else {
 316                         otg_ctrl->b_sess_vld = 0;
 317                         otg_ctrl->b_sess_end = 1;
 318                 }
 319         } else {
 320                 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
 321                 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
 322         }
 323
 324         if (mvotg->pdata->id)
 325                 otg_ctrl->id = !!mvotg->pdata->id->poll();
 326         else
 327                 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
 328
 329         if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
 330                 otg_ctrl->a_bus_req = 1;
 331
 332         otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
 333         otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
 334
 335         dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
 336         dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
 337         dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
 338         dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
 339         dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
 340         dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
 341 }
 342
 343 static void mv_otg_update_state(struct mv_otg *mvotg)
 344 {
 345         struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
 346         struct usb_phy *phy = &mvotg->phy;
 347         int old_state = phy->state;
 348
 349         switch (old_state) {
 350         case OTG_STATE_UNDEFINED:
 351                 phy->state = OTG_STATE_B_IDLE;
 352                 /* FALL THROUGH */
 353         case OTG_STATE_B_IDLE:
 354                 if (otg_ctrl->id == 0)
 355                         phy->state = OTG_STATE_A_IDLE;
 356                 else if (otg_ctrl->b_sess_vld)
 357                         phy->state = OTG_STATE_B_PERIPHERAL;
 358                 break;
 359         case OTG_STATE_B_PERIPHERAL:
 360                 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
 361                         phy->state = OTG_STATE_B_IDLE;
 362                 break;
 363         case OTG_STATE_A_IDLE:
 364                 if (otg_ctrl->id)
 365                         phy->state = OTG_STATE_B_IDLE;
 366                 else if (!(otg_ctrl->a_bus_drop) &&
 367                          (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
 368                         phy->state = OTG_STATE_A_WAIT_VRISE;
 369                 break;
 370         case OTG_STATE_A_WAIT_VRISE:
 371                 if (otg_ctrl->a_vbus_vld)
 372                         phy->state = OTG_STATE_A_WAIT_BCON;
 373                 break;
 374         case OTG_STATE_A_WAIT_BCON:
 375                 if (otg_ctrl->id || otg_ctrl->a_bus_drop
 376                     || otg_ctrl->a_wait_bcon_timeout) {
 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_WAIT_VFALL;
 380                         otg_ctrl->a_bus_req = 0;
 381                 } else if (!otg_ctrl->a_vbus_vld) {
 382                         mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
 383                         mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
 384                         phy->state = OTG_STATE_A_VBUS_ERR;
 385                 } else if (otg_ctrl->b_conn) {
 386                         mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
 387                         mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
 388                         phy->state = OTG_STATE_A_HOST;
 389                 }
 390                 break;
 391         case OTG_STATE_A_HOST:
 392                 if (otg_ctrl->id || !otg_ctrl->b_conn
 393                     || otg_ctrl->a_bus_drop)
 394                         phy->state = OTG_STATE_A_WAIT_BCON;
 395                 else if (!otg_ctrl->a_vbus_vld)
 396                         phy->state = OTG_STATE_A_VBUS_ERR;
 397                 break;
 398         case OTG_STATE_A_WAIT_VFALL:
 399                 if (otg_ctrl->id
 400                     || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
 401                     || otg_ctrl->a_bus_req)
 402                         phy->state = OTG_STATE_A_IDLE;
 403                 break;
 404         case OTG_STATE_A_VBUS_ERR:
 405                 if (otg_ctrl->id || otg_ctrl->a_clr_err
 406                     || otg_ctrl->a_bus_drop) {
 407                         otg_ctrl->a_clr_err = 0;
 408                         phy->state = OTG_STATE_A_WAIT_VFALL;
 409                 }
 410                 break;
 411         default:
 412                 break;
 413         }
 414 }
 415
 416 static void mv_otg_work(struct work_struct *work)
 417 {
 418         struct mv_otg *mvotg;
 419         struct usb_phy *phy;
 420         struct usb_otg *otg;
 421         int old_state;
 422
 423         mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
 424
 425 run:
 426         /* work queue is single thread, or we need spin_lock to protect */
 427         phy = &mvotg->phy;
 428         otg = phy->otg;
 429         old_state = phy->state;
 430
 431         if (!mvotg->active)
 432                 return;
 433
 434         mv_otg_update_inputs(mvotg);
 435         mv_otg_update_state(mvotg);
 436
 437         if (old_state != phy->state) {
 438                 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
 439                          state_string[old_state],
 440                          state_string[phy->state]);
 441
 442                 switch (phy->state) {
 443                 case OTG_STATE_B_IDLE:
 444                         otg->default_a = 0;
 445                         if (old_state == OTG_STATE_B_PERIPHERAL)
 446                                 mv_otg_start_periphrals(mvotg, 0);
 447                         mv_otg_reset(mvotg);
 448                         mv_otg_disable(mvotg);
 449                         break;
 450                 case OTG_STATE_B_PERIPHERAL:
 451                         mv_otg_enable(mvotg);
 452                         mv_otg_start_periphrals(mvotg, 1);
 453                         break;
 454                 case OTG_STATE_A_IDLE:
 455                         otg->default_a = 1;
 456                         mv_otg_enable(mvotg);
 457                         if (old_state == OTG_STATE_A_WAIT_VFALL)
 458                                 mv_otg_start_host(mvotg, 0);
 459                         mv_otg_reset(mvotg);
 460                         break;
 461                 case OTG_STATE_A_WAIT_VRISE:
 462                         mv_otg_set_vbus(otg, 1);
 463                         break;
 464                 case OTG_STATE_A_WAIT_BCON:
 465                         if (old_state != OTG_STATE_A_HOST)
 466                                 mv_otg_start_host(mvotg, 1);
 467                         mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
 468                                          T_A_WAIT_BCON,
 469                                          mv_otg_timer_await_bcon);
 470                         /*
 471                          * Now, we directly enter A_HOST. So set b_conn = 1
 472                          * here. In fact, it need host driver to notify us.
 473                          */
 474                         mvotg->otg_ctrl.b_conn = 1;
 475                         break;
 476                 case OTG_STATE_A_HOST:
 477                         break;
 478                 case OTG_STATE_A_WAIT_VFALL:
 479                         /*
 480                          * Now, we has exited A_HOST. So set b_conn = 0
 481                          * here. In fact, it need host driver to notify us.
 482                          */
 483                         mvotg->otg_ctrl.b_conn = 0;
 484                         mv_otg_set_vbus(otg, 0);
 485                         break;
 486                 case OTG_STATE_A_VBUS_ERR:
 487                         break;
 488                 default:
 489                         break;
 490                 }
 491                 goto run;
 492         }
 493 }
 494
 495 static irqreturn_t mv_otg_irq(int irq, void *dev)
 496 {
 497         struct mv_otg *mvotg = dev;
 498         u32 otgsc;
 499
 500         otgsc = readl(&mvotg->op_regs->otgsc);
 501         writel(otgsc, &mvotg->op_regs->otgsc);
 502
 503         /*
 504          * if we have vbus, then the vbus detection for B-device
 505          * will be done by mv_otg_inputs_irq().
 506          */
 507         if (mvotg->pdata->vbus)
 508                 if ((otgsc & OTGSC_STS_USB_ID) &&
 509                     !(otgsc & OTGSC_INTSTS_USB_ID))
 510                         return IRQ_NONE;
 511
 512         if ((otgsc & mvotg->irq_status) == 0)
 513                 return IRQ_NONE;
 514
 515         mv_otg_run_state_machine(mvotg, 0);
 516
 517         return IRQ_HANDLED;
 518 }
 519
 520 static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
 521 {
 522         struct mv_otg *mvotg = dev;
 523
 524         /* The clock may disabled at this time */
 525         if (!mvotg->active) {
 526                 mv_otg_enable(mvotg);
 527                 mv_otg_init_irq(mvotg);
 528         }
 529
 530         mv_otg_run_state_machine(mvotg, 0);
 531
 532         return IRQ_HANDLED;
 533 }
 534
 535 static ssize_t
 536 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
 537 {
 538         struct mv_otg *mvotg = dev_get_drvdata(dev);
 539         return scnprintf(buf, PAGE_SIZE, "%d\n",
 540                          mvotg->otg_ctrl.a_bus_req);
 541 }
 542
 543 static ssize_t
 544 set_a_bus_req(struct device *dev, struct device_attribute *attr,
 545               const char *buf, size_t count)
 546 {
 547         struct mv_otg *mvotg = dev_get_drvdata(dev);
 548
 549         if (count > 2)
 550                 return -1;
 551
 552         /* We will use this interface to change to A device */
 553         if (mvotg->phy.state != OTG_STATE_B_IDLE
 554             && mvotg->phy.state != OTG_STATE_A_IDLE)
 555                 return -1;
 556
 557         /* The clock may disabled and we need to set irq for ID detected */
 558         mv_otg_enable(mvotg);
 559         mv_otg_init_irq(mvotg);
 560
 561         if (buf[0] == '1') {
 562                 mvotg->otg_ctrl.a_bus_req = 1;
 563                 mvotg->otg_ctrl.a_bus_drop = 0;
 564                 dev_dbg(&mvotg->pdev->dev,
 565                         "User request: a_bus_req = 1\n");
 566
 567                 if (spin_trylock(&mvotg->wq_lock)) {
 568                         mv_otg_run_state_machine(mvotg, 0);
 569                         spin_unlock(&mvotg->wq_lock);
 570                 }
 571         }
 572
 573         return count;
 574 }
 575
 576 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
 577                    set_a_bus_req);
 578
 579 static ssize_t
 580 set_a_clr_err(struct device *dev, struct device_attribute *attr,
 581               const char *buf, size_t count)
 582 {
 583         struct mv_otg *mvotg = dev_get_drvdata(dev);
 584         if (!mvotg->phy.otg->default_a)
 585                 return -1;
 586
 587         if (count > 2)
 588                 return -1;
 589
 590         if (buf[0] == '1') {
 591                 mvotg->otg_ctrl.a_clr_err = 1;
 592                 dev_dbg(&mvotg->pdev->dev,
 593                         "User request: a_clr_err = 1\n");
 594         }
 595
 596         if (spin_trylock(&mvotg->wq_lock)) {
 597                 mv_otg_run_state_machine(mvotg, 0);
 598                 spin_unlock(&mvotg->wq_lock);
 599         }
 600
 601         return count;
 602 }
 603
 604 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
 605
 606 static ssize_t
 607 get_a_bus_drop(struct device *dev, struct device_attribute *attr,
 608                char *buf)
 609 {
 610         struct mv_otg *mvotg = dev_get_drvdata(dev);
 611         return scnprintf(buf, PAGE_SIZE, "%d\n",
 612                          mvotg->otg_ctrl.a_bus_drop);
 613 }
 614
 615 static ssize_t
 616 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
 617                const char *buf, size_t count)
 618 {
 619         struct mv_otg *mvotg = dev_get_drvdata(dev);
 620         if (!mvotg->phy.otg->default_a)
 621                 return -1;
 622
 623         if (count > 2)
 624                 return -1;
 625
 626         if (buf[0] == '0') {
 627                 mvotg->otg_ctrl.a_bus_drop = 0;
 628                 dev_dbg(&mvotg->pdev->dev,
 629                         "User request: a_bus_drop = 0\n");
 630         } else if (buf[0] == '1') {
 631                 mvotg->otg_ctrl.a_bus_drop = 1;
 632                 mvotg->otg_ctrl.a_bus_req = 0;
 633                 dev_dbg(&mvotg->pdev->dev,
 634                         "User request: a_bus_drop = 1\n");
 635                 dev_dbg(&mvotg->pdev->dev,
 636                         "User request: and a_bus_req = 0\n");
 637         }
 638
 639         if (spin_trylock(&mvotg->wq_lock)) {
 640                 mv_otg_run_state_machine(mvotg, 0);
 641                 spin_unlock(&mvotg->wq_lock);
 642         }
 643
 644         return count;
 645 }
 646
 647 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
 648                    get_a_bus_drop, set_a_bus_drop);
 649
 650 static struct attribute *inputs_attrs[] = {
 651         &dev_attr_a_bus_req.attr,
 652         &dev_attr_a_clr_err.attr,
 653         &dev_attr_a_bus_drop.attr,
 654         NULL,
 655 };
 656
 657 static struct attribute_group inputs_attr_group = {
 658         .name = "inputs",
 659         .attrs = inputs_attrs,
 660 };
 661
 662 int mv_otg_remove(struct platform_device *pdev)
 663 {
 664         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 665
 666         sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
 667
 668         if (mvotg->qwork) {
 669                 flush_workqueue(mvotg->qwork);
 670                 destroy_workqueue(mvotg->qwork);
 671         }
 672
 673         mv_otg_disable(mvotg);
 674
 675         usb_remove_phy(&mvotg->phy);
 676         platform_set_drvdata(pdev, NULL);
 677
 678         return 0;
 679 }
 680
 681 static int mv_otg_probe(struct platform_device *pdev)
 682 {
 683         struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
 684         struct mv_otg *mvotg;
 685         struct usb_otg *otg;
 686         struct resource *r;
 687         int retval = 0, clk_i, i;
 688         size_t size;
 689
 690         if (pdata == NULL) {
 691                 dev_err(&pdev->dev, "failed to get platform data\n");
 692                 return -ENODEV;
 693         }
 694
 695         size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
 696         mvotg = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 697         if (!mvotg) {
 698                 dev_err(&pdev->dev, "failed to allocate memory!\n");
 699                 return -ENOMEM;
 700         }
 701
 702         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 703         if (!otg)
 704                 return -ENOMEM;
 705
 706         platform_set_drvdata(pdev, mvotg);
 707
 708         mvotg->pdev = pdev;
 709         mvotg->pdata = pdata;
 710
 711         mvotg->clknum = pdata->clknum;
 712         for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
 713                 mvotg->clk[clk_i] = devm_clk_get(&pdev->dev,
 714                                                 pdata->clkname[clk_i]);
 715                 if (IS_ERR(mvotg->clk[clk_i])) {
 716                         retval = PTR_ERR(mvotg->clk[clk_i]);
 717                         return retval;
 718                 }
 719         }
 720
 721         mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
 722         if (!mvotg->qwork) {
 723                 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
 724                 return -ENOMEM;
 725         }
 726
 727         INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
 728
 729         /* OTG common part */
 730         mvotg->pdev = pdev;
 731         mvotg->phy.dev = &pdev->dev;
 732         mvotg->phy.otg = otg;
 733         mvotg->phy.label = driver_name;
 734         mvotg->phy.state = OTG_STATE_UNDEFINED;
 735
 736         otg->phy = &mvotg->phy;
 737         otg->set_host = mv_otg_set_host;
 738         otg->set_peripheral = mv_otg_set_peripheral;
 739         otg->set_vbus = mv_otg_set_vbus;
 740
 741         for (i = 0; i < OTG_TIMER_NUM; i++)
 742                 init_timer(&mvotg->otg_ctrl.timer[i]);
 743
 744         r = platform_get_resource_byname(mvotg->pdev,
 745                                          IORESOURCE_MEM, "phyregs");
 746         if (r == NULL) {
 747                 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
 748                 retval = -ENODEV;
 749                 goto err_destroy_workqueue;
 750         }
 751
 752         mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 753         if (mvotg->phy_regs == NULL) {
 754                 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
 755                 retval = -EFAULT;
 756                 goto err_destroy_workqueue;
 757         }
 758
 759         r = platform_get_resource_byname(mvotg->pdev,
 760                                          IORESOURCE_MEM, "capregs");
 761         if (r == NULL) {
 762                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 763                 retval = -ENODEV;
 764                 goto err_destroy_workqueue;
 765         }
 766
 767         mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 768         if (mvotg->cap_regs == NULL) {
 769                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 770                 retval = -EFAULT;
 771                 goto err_destroy_workqueue;
 772         }
 773
 774         /* we will acces controller register, so enable the udc controller */
 775         retval = mv_otg_enable_internal(mvotg);
 776         if (retval) {
 777                 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
 778                 goto err_destroy_workqueue;
 779         }
 780
 781         mvotg->op_regs =
 782                 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
 783                         + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
 784
 785         if (pdata->id) {
 786                 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
 787                                                 NULL, mv_otg_inputs_irq,
 788                                                 IRQF_ONESHOT, "id", mvotg);
 789                 if (retval) {
 790                         dev_info(&pdev->dev,
 791                                  "Failed to request irq for ID\n");
 792                         pdata->id = NULL;
 793                 }
 794         }
 795
 796         if (pdata->vbus) {
 797                 mvotg->clock_gating = 1;
 798                 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
 799                                                 NULL, mv_otg_inputs_irq,
 800                                                 IRQF_ONESHOT, "vbus", mvotg);
 801                 if (retval) {
 802                         dev_info(&pdev->dev,
 803                                  "Failed to request irq for VBUS, "
 804                                  "disable clock gating\n");
 805                         mvotg->clock_gating = 0;
 806                         pdata->vbus = NULL;
 807                 }
 808         }
 809
 810         if (pdata->disable_otg_clock_gating)
 811                 mvotg->clock_gating = 0;
 812
 813         mv_otg_reset(mvotg);
 814         mv_otg_init_irq(mvotg);
 815
 816         r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
 817         if (r == NULL) {
 818                 dev_err(&pdev->dev, "no IRQ resource defined\n");
 819                 retval = -ENODEV;
 820                 goto err_disable_clk;
 821         }
 822
 823         mvotg->irq = r->start;
 824         if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
 825                         driver_name, mvotg)) {
 826                 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
 827                         mvotg->irq);
 828                 mvotg->irq = 0;
 829                 retval = -ENODEV;
 830                 goto err_disable_clk;
 831         }
 832
 833         retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
 834         if (retval < 0) {
 835                 dev_err(&pdev->dev, "can't register transceiver, %d\n",
 836                         retval);
 837                 goto err_disable_clk;
 838         }
 839
 840         retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
 841         if (retval < 0) {
 842                 dev_dbg(&pdev->dev,
 843                         "Can't register sysfs attr group: %d\n", retval);
 844                 goto err_remove_phy;
 845         }
 846
 847         spin_lock_init(&mvotg->wq_lock);
 848         if (spin_trylock(&mvotg->wq_lock)) {
 849                 mv_otg_run_state_machine(mvotg, 2 * HZ);
 850                 spin_unlock(&mvotg->wq_lock);
 851         }
 852
 853         dev_info(&pdev->dev,
 854                  "successful probe OTG device %s clock gating.\n",
 855                  mvotg->clock_gating ? "with" : "without");
 856
 857         return 0;
 858
 859 err_remove_phy:
 860         usb_remove_phy(&mvotg->phy);
 861 err_disable_clk:
 862         mv_otg_disable_internal(mvotg);
 863 err_destroy_workqueue:
 864         flush_workqueue(mvotg->qwork);
 865         destroy_workqueue(mvotg->qwork);
 866
 867         platform_set_drvdata(pdev, NULL);
 868
 869         return retval;
 870 }
 871
 872 #ifdef CONFIG_PM
 873 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
 874 {
 875         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 876
 877         if (mvotg->phy.state != OTG_STATE_B_IDLE) {
 878                 dev_info(&pdev->dev,
 879                          "OTG state is not B_IDLE, it is %d!\n",
 880                          mvotg->phy.state);
 881                 return -EAGAIN;
 882         }
 883
 884         if (!mvotg->clock_gating)
 885                 mv_otg_disable_internal(mvotg);
 886
 887         return 0;
 888 }
 889
 890 static int mv_otg_resume(struct platform_device *pdev)
 891 {
 892         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 893         u32 otgsc;
 894
 895         if (!mvotg->clock_gating) {
 896                 mv_otg_enable_internal(mvotg);
 897
 898                 otgsc = readl(&mvotg->op_regs->otgsc);
 899                 otgsc |= mvotg->irq_en;
 900                 writel(otgsc, &mvotg->op_regs->otgsc);
 901
 902                 if (spin_trylock(&mvotg->wq_lock)) {
 903                         mv_otg_run_state_machine(mvotg, 0);
 904                         spin_unlock(&mvotg->wq_lock);
 905                 }
 906         }
 907         return 0;
 908 }
 909 #endif
 910
 911 static struct platform_driver mv_otg_driver = {
 912         .probe = mv_otg_probe,
 913         .remove = __exit_p(mv_otg_remove),
 914         .driver = {
 915                    .owner = THIS_MODULE,
 916                    .name = driver_name,
 917                    },
 918 #ifdef CONFIG_PM
 919         .suspend = mv_otg_suspend,
 920         .resume = mv_otg_resume,
 921 #endif
 922 };
 923 module_platform_driver(mv_otg_driver);