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 otg_transceiver *otg, bool on)
  59 {
  60         struct mv_otg *mvotg = container_of(otg, struct mv_otg, otg);
  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 otg_transceiver *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 otg_transceiver *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 otg_transceiver *otg = &mvotg->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 otg_transceiver *otg = &mvotg->otg;
 226
 227         if (!otg->gadget)
 228                 return;
 229
 230         dev_info(otg->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_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(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 otg_transceiver *otg = &mvotg->otg;
 347         int old_state = otg->state;
 348
 349         switch (old_state) {
 350         case OTG_STATE_UNDEFINED:
 351                 otg->state = OTG_STATE_B_IDLE;
 352                 /* FALL THROUGH */
 353         case OTG_STATE_B_IDLE:
 354                 if (otg_ctrl->id == 0)
 355                         otg->state = OTG_STATE_A_IDLE;
 356                 else if (otg_ctrl->b_sess_vld)
 357                         otg->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                         otg->state = OTG_STATE_B_IDLE;
 362                 break;
 363         case OTG_STATE_A_IDLE:
 364                 if (otg_ctrl->id)
 365                         otg->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                         otg->state = OTG_STATE_A_WAIT_VRISE;
 369                 break;
 370         case OTG_STATE_A_WAIT_VRISE:
 371                 if (otg_ctrl->a_vbus_vld)
 372                         otg->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                         otg->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                         otg->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                         otg->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                         otg->state = OTG_STATE_A_WAIT_BCON;
 395                 else if (!otg_ctrl->a_vbus_vld)
 396                         otg->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                         otg->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                         otg->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 otg_transceiver *otg;
 420         int old_state;
 421
 422         mvotg = container_of((struct delayed_work *)work, struct mv_otg, work);
 423
 424 run:
 425         /* work queue is single thread, or we need spin_lock to protect */
 426         otg = &mvotg->otg;
 427         old_state = otg->state;
 428
 429         if (!mvotg->active)
 430                 return;
 431
 432         mv_otg_update_inputs(mvotg);
 433         mv_otg_update_state(mvotg);
 434
 435         if (old_state != otg->state) {
 436                 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
 437                          state_string[old_state],
 438                          state_string[otg->state]);
 439
 440                 switch (otg->state) {
 441                 case OTG_STATE_B_IDLE:
 442                         mvotg->otg.default_a = 0;
 443                         if (old_state == OTG_STATE_B_PERIPHERAL)
 444                                 mv_otg_start_periphrals(mvotg, 0);
 445                         mv_otg_reset(mvotg);
 446                         mv_otg_disable(mvotg);
 447                         break;
 448                 case OTG_STATE_B_PERIPHERAL:
 449                         mv_otg_enable(mvotg);
 450                         mv_otg_start_periphrals(mvotg, 1);
 451                         break;
 452                 case OTG_STATE_A_IDLE:
 453                         mvotg->otg.default_a = 1;
 454                         mv_otg_enable(mvotg);
 455                         if (old_state == OTG_STATE_A_WAIT_VFALL)
 456                                 mv_otg_start_host(mvotg, 0);
 457                         mv_otg_reset(mvotg);
 458                         break;
 459                 case OTG_STATE_A_WAIT_VRISE:
 460                         mv_otg_set_vbus(&mvotg->otg, 1);
 461                         break;
 462                 case OTG_STATE_A_WAIT_BCON:
 463                         if (old_state != OTG_STATE_A_HOST)
 464                                 mv_otg_start_host(mvotg, 1);
 465                         mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
 466                                          T_A_WAIT_BCON,
 467                                          mv_otg_timer_await_bcon);
 468                         /*
 469                          * Now, we directly enter A_HOST. So set b_conn = 1
 470                          * here. In fact, it need host driver to notify us.
 471                          */
 472                         mvotg->otg_ctrl.b_conn = 1;
 473                         break;
 474                 case OTG_STATE_A_HOST:
 475                         break;
 476                 case OTG_STATE_A_WAIT_VFALL:
 477                         /*
 478                          * Now, we has exited A_HOST. So set b_conn = 0
 479                          * here. In fact, it need host driver to notify us.
 480                          */
 481                         mvotg->otg_ctrl.b_conn = 0;
 482                         mv_otg_set_vbus(&mvotg->otg, 0);
 483                         break;
 484                 case OTG_STATE_A_VBUS_ERR:
 485                         break;
 486                 default:
 487                         break;
 488                 }
 489                 goto run;
 490         }
 491 }
 492
 493 static irqreturn_t mv_otg_irq(int irq, void *dev)
 494 {
 495         struct mv_otg *mvotg = dev;
 496         u32 otgsc;
 497
 498         otgsc = readl(&mvotg->op_regs->otgsc);
 499         writel(otgsc, &mvotg->op_regs->otgsc);
 500
 501         /*
 502          * if we have vbus, then the vbus detection for B-device
 503          * will be done by mv_otg_inputs_irq().
 504          */
 505         if (mvotg->pdata->vbus)
 506                 if ((otgsc & OTGSC_STS_USB_ID) &&
 507                     !(otgsc & OTGSC_INTSTS_USB_ID))
 508                         return IRQ_NONE;
 509
 510         if ((otgsc & mvotg->irq_status) == 0)
 511                 return IRQ_NONE;
 512
 513         mv_otg_run_state_machine(mvotg, 0);
 514
 515         return IRQ_HANDLED;
 516 }
 517
 518 static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
 519 {
 520         struct mv_otg *mvotg = dev;
 521
 522         /* The clock may disabled at this time */
 523         if (!mvotg->active) {
 524                 mv_otg_enable(mvotg);
 525                 mv_otg_init_irq(mvotg);
 526         }
 527
 528         mv_otg_run_state_machine(mvotg, 0);
 529
 530         return IRQ_HANDLED;
 531 }
 532
 533 static ssize_t
 534 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
 535 {
 536         struct mv_otg *mvotg = dev_get_drvdata(dev);
 537         return scnprintf(buf, PAGE_SIZE, "%d\n",
 538                          mvotg->otg_ctrl.a_bus_req);
 539 }
 540
 541 static ssize_t
 542 set_a_bus_req(struct device *dev, struct device_attribute *attr,
 543               const char *buf, size_t count)
 544 {
 545         struct mv_otg *mvotg = dev_get_drvdata(dev);
 546
 547         if (count > 2)
 548                 return -1;
 549
 550         /* We will use this interface to change to A device */
 551         if (mvotg->otg.state != OTG_STATE_B_IDLE
 552             && mvotg->otg.state != OTG_STATE_A_IDLE)
 553                 return -1;
 554
 555         /* The clock may disabled and we need to set irq for ID detected */
 556         mv_otg_enable(mvotg);
 557         mv_otg_init_irq(mvotg);
 558
 559         if (buf[0] == '1') {
 560                 mvotg->otg_ctrl.a_bus_req = 1;
 561                 mvotg->otg_ctrl.a_bus_drop = 0;
 562                 dev_dbg(&mvotg->pdev->dev,
 563                         "User request: a_bus_req = 1\n");
 564
 565                 if (spin_trylock(&mvotg->wq_lock)) {
 566                         mv_otg_run_state_machine(mvotg, 0);
 567                         spin_unlock(&mvotg->wq_lock);
 568                 }
 569         }
 570
 571         return count;
 572 }
 573
 574 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
 575                    set_a_bus_req);
 576
 577 static ssize_t
 578 set_a_clr_err(struct device *dev, struct device_attribute *attr,
 579               const char *buf, size_t count)
 580 {
 581         struct mv_otg *mvotg = dev_get_drvdata(dev);
 582         if (!mvotg->otg.default_a)
 583                 return -1;
 584
 585         if (count > 2)
 586                 return -1;
 587
 588         if (buf[0] == '1') {
 589                 mvotg->otg_ctrl.a_clr_err = 1;
 590                 dev_dbg(&mvotg->pdev->dev,
 591                         "User request: a_clr_err = 1\n");
 592         }
 593
 594         if (spin_trylock(&mvotg->wq_lock)) {
 595                 mv_otg_run_state_machine(mvotg, 0);
 596                 spin_unlock(&mvotg->wq_lock);
 597         }
 598
 599         return count;
 600 }
 601
 602 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
 603
 604 static ssize_t
 605 get_a_bus_drop(struct device *dev, struct device_attribute *attr,
 606                char *buf)
 607 {
 608         struct mv_otg *mvotg = dev_get_drvdata(dev);
 609         return scnprintf(buf, PAGE_SIZE, "%d\n",
 610                          mvotg->otg_ctrl.a_bus_drop);
 611 }
 612
 613 static ssize_t
 614 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
 615                const char *buf, size_t count)
 616 {
 617         struct mv_otg *mvotg = dev_get_drvdata(dev);
 618         if (!mvotg->otg.default_a)
 619                 return -1;
 620
 621         if (count > 2)
 622                 return -1;
 623
 624         if (buf[0] == '0') {
 625                 mvotg->otg_ctrl.a_bus_drop = 0;
 626                 dev_dbg(&mvotg->pdev->dev,
 627                         "User request: a_bus_drop = 0\n");
 628         } else if (buf[0] == '1') {
 629                 mvotg->otg_ctrl.a_bus_drop = 1;
 630                 mvotg->otg_ctrl.a_bus_req = 0;
 631                 dev_dbg(&mvotg->pdev->dev,
 632                         "User request: a_bus_drop = 1\n");
 633                 dev_dbg(&mvotg->pdev->dev,
 634                         "User request: and a_bus_req = 0\n");
 635         }
 636
 637         if (spin_trylock(&mvotg->wq_lock)) {
 638                 mv_otg_run_state_machine(mvotg, 0);
 639                 spin_unlock(&mvotg->wq_lock);
 640         }
 641
 642         return count;
 643 }
 644
 645 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
 646                    get_a_bus_drop, set_a_bus_drop);
 647
 648 static struct attribute *inputs_attrs[] = {
 649         &dev_attr_a_bus_req.attr,
 650         &dev_attr_a_clr_err.attr,
 651         &dev_attr_a_bus_drop.attr,
 652         NULL,
 653 };
 654
 655 static struct attribute_group inputs_attr_group = {
 656         .name = "inputs",
 657         .attrs = inputs_attrs,
 658 };
 659
 660 int mv_otg_remove(struct platform_device *pdev)
 661 {
 662         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 663         int clk_i;
 664
 665         sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
 666
 667         if (mvotg->irq)
 668                 free_irq(mvotg->irq, mvotg);
 669
 670         if (mvotg->pdata->vbus)
 671                 free_irq(mvotg->pdata->vbus->irq, mvotg);
 672         if (mvotg->pdata->id)
 673                 free_irq(mvotg->pdata->id->irq, mvotg);
 674
 675         if (mvotg->qwork) {
 676                 flush_workqueue(mvotg->qwork);
 677                 destroy_workqueue(mvotg->qwork);
 678         }
 679
 680         mv_otg_disable(mvotg);
 681
 682         if (mvotg->cap_regs)
 683                 iounmap(mvotg->cap_regs);
 684
 685         if (mvotg->phy_regs)
 686                 iounmap(mvotg->phy_regs);
 687
 688         for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++)
 689                 clk_put(mvotg->clk[clk_i]);
 690
 691         otg_set_transceiver(NULL);
 692         platform_set_drvdata(pdev, NULL);
 693
 694         kfree(mvotg);
 695
 696         return 0;
 697 }
 698
 699 static int mv_otg_probe(struct platform_device *pdev)
 700 {
 701         struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
 702         struct mv_otg *mvotg;
 703         struct resource *r;
 704         int retval = 0, clk_i, i;
 705         size_t size;
 706
 707         if (pdata == NULL) {
 708                 dev_err(&pdev->dev, "failed to get platform data\n");
 709                 return -ENODEV;
 710         }
 711
 712         size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
 713         mvotg = kzalloc(size, GFP_KERNEL);
 714         if (!mvotg) {
 715                 dev_err(&pdev->dev, "failed to allocate memory!\n");
 716                 return -ENOMEM;
 717         }
 718
 719         platform_set_drvdata(pdev, mvotg);
 720
 721         mvotg->pdev = pdev;
 722         mvotg->pdata = pdata;
 723
 724         mvotg->clknum = pdata->clknum;
 725         for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
 726                 mvotg->clk[clk_i] = clk_get(&pdev->dev, pdata->clkname[clk_i]);
 727                 if (IS_ERR(mvotg->clk[clk_i])) {
 728                         retval = PTR_ERR(mvotg->clk[clk_i]);
 729                         goto err_put_clk;
 730                 }
 731         }
 732
 733         mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
 734         if (!mvotg->qwork) {
 735                 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
 736                 retval = -ENOMEM;
 737                 goto err_put_clk;
 738         }
 739
 740         INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
 741
 742         /* OTG common part */
 743         mvotg->pdev = pdev;
 744         mvotg->otg.dev = &pdev->dev;
 745         mvotg->otg.label = driver_name;
 746         mvotg->otg.set_host = mv_otg_set_host;
 747         mvotg->otg.set_peripheral = mv_otg_set_peripheral;
 748         mvotg->otg.set_vbus = mv_otg_set_vbus;
 749         mvotg->otg.state = OTG_STATE_UNDEFINED;
 750
 751         for (i = 0; i < OTG_TIMER_NUM; i++)
 752                 init_timer(&mvotg->otg_ctrl.timer[i]);
 753
 754         r = platform_get_resource_byname(mvotg->pdev,
 755                                          IORESOURCE_MEM, "phyregs");
 756         if (r == NULL) {
 757                 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
 758                 retval = -ENODEV;
 759                 goto err_destroy_workqueue;
 760         }
 761
 762         mvotg->phy_regs = ioremap(r->start, resource_size(r));
 763         if (mvotg->phy_regs == NULL) {
 764                 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
 765                 retval = -EFAULT;
 766                 goto err_destroy_workqueue;
 767         }
 768
 769         r = platform_get_resource_byname(mvotg->pdev,
 770                                          IORESOURCE_MEM, "capregs");
 771         if (r == NULL) {
 772                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 773                 retval = -ENODEV;
 774                 goto err_unmap_phyreg;
 775         }
 776
 777         mvotg->cap_regs = ioremap(r->start, resource_size(r));
 778         if (mvotg->cap_regs == NULL) {
 779                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 780                 retval = -EFAULT;
 781                 goto err_unmap_phyreg;
 782         }
 783
 784         /* we will acces controller register, so enable the udc controller */
 785         retval = mv_otg_enable_internal(mvotg);
 786         if (retval) {
 787                 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
 788                 goto err_unmap_capreg;
 789         }
 790
 791         mvotg->op_regs =
 792                 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
 793                         + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
 794
 795         if (pdata->id) {
 796                 retval = request_threaded_irq(pdata->id->irq, NULL,
 797                                               mv_otg_inputs_irq,
 798                                               IRQF_ONESHOT, "id", mvotg);
 799                 if (retval) {
 800                         dev_info(&pdev->dev,
 801                                  "Failed to request irq for ID\n");
 802                         pdata->id = NULL;
 803                 }
 804         }
 805
 806         if (pdata->vbus) {
 807                 mvotg->clock_gating = 1;
 808                 retval = request_threaded_irq(pdata->vbus->irq, NULL,
 809                                               mv_otg_inputs_irq,
 810                                               IRQF_ONESHOT, "vbus", mvotg);
 811                 if (retval) {
 812                         dev_info(&pdev->dev,
 813                                  "Failed to request irq for VBUS, "
 814                                  "disable clock gating\n");
 815                         mvotg->clock_gating = 0;
 816                         pdata->vbus = NULL;
 817                 }
 818         }
 819
 820         if (pdata->disable_otg_clock_gating)
 821                 mvotg->clock_gating = 0;
 822
 823         mv_otg_reset(mvotg);
 824         mv_otg_init_irq(mvotg);
 825
 826         r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
 827         if (r == NULL) {
 828                 dev_err(&pdev->dev, "no IRQ resource defined\n");
 829                 retval = -ENODEV;
 830                 goto err_disable_clk;
 831         }
 832
 833         mvotg->irq = r->start;
 834         if (request_irq(mvotg->irq, mv_otg_irq, IRQF_SHARED,
 835                         driver_name, mvotg)) {
 836                 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
 837                         mvotg->irq);
 838                 mvotg->irq = 0;
 839                 retval = -ENODEV;
 840                 goto err_disable_clk;
 841         }
 842
 843         retval = otg_set_transceiver(&mvotg->otg);
 844         if (retval < 0) {
 845                 dev_err(&pdev->dev, "can't register transceiver, %d\n",
 846                         retval);
 847                 goto err_free_irq;
 848         }
 849
 850         retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
 851         if (retval < 0) {
 852                 dev_dbg(&pdev->dev,
 853                         "Can't register sysfs attr group: %d\n", retval);
 854                 goto err_set_transceiver;
 855         }
 856
 857         spin_lock_init(&mvotg->wq_lock);
 858         if (spin_trylock(&mvotg->wq_lock)) {
 859                 mv_otg_run_state_machine(mvotg, 2 * HZ);
 860                 spin_unlock(&mvotg->wq_lock);
 861         }
 862
 863         dev_info(&pdev->dev,
 864                  "successful probe OTG device %s clock gating.\n",
 865                  mvotg->clock_gating ? "with" : "without");
 866
 867         return 0;
 868
 869 err_set_transceiver:
 870         otg_set_transceiver(NULL);
 871 err_free_irq:
 872         free_irq(mvotg->irq, mvotg);
 873 err_disable_clk:
 874         if (pdata->vbus)
 875                 free_irq(pdata->vbus->irq, mvotg);
 876         if (pdata->id)
 877                 free_irq(pdata->id->irq, mvotg);
 878         mv_otg_disable_internal(mvotg);
 879 err_unmap_capreg:
 880         iounmap(mvotg->cap_regs);
 881 err_unmap_phyreg:
 882         iounmap(mvotg->phy_regs);
 883 err_destroy_workqueue:
 884         flush_workqueue(mvotg->qwork);
 885         destroy_workqueue(mvotg->qwork);
 886 err_put_clk:
 887         for (clk_i--; clk_i >= 0; clk_i--)
 888                 clk_put(mvotg->clk[clk_i]);
 889
 890         platform_set_drvdata(pdev, NULL);
 891         kfree(mvotg);
 892
 893         return retval;
 894 }
 895
 896 #ifdef CONFIG_PM
 897 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
 898 {
 899         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 900
 901         if (mvotg->otg.state != OTG_STATE_B_IDLE) {
 902                 dev_info(&pdev->dev,
 903                          "OTG state is not B_IDLE, it is %d!\n",
 904                          mvotg->otg.state);
 905                 return -EAGAIN;
 906         }
 907
 908         if (!mvotg->clock_gating)
 909                 mv_otg_disable_internal(mvotg);
 910
 911         return 0;
 912 }
 913
 914 static int mv_otg_resume(struct platform_device *pdev)
 915 {
 916         struct mv_otg *mvotg = platform_get_drvdata(pdev);
 917         u32 otgsc;
 918
 919         if (!mvotg->clock_gating) {
 920                 mv_otg_enable_internal(mvotg);
 921
 922                 otgsc = readl(&mvotg->op_regs->otgsc);
 923                 otgsc |= mvotg->irq_en;
 924                 writel(otgsc, &mvotg->op_regs->otgsc);
 925
 926                 if (spin_trylock(&mvotg->wq_lock)) {
 927                         mv_otg_run_state_machine(mvotg, 0);
 928                         spin_unlock(&mvotg->wq_lock);
 929                 }
 930         }
 931         return 0;
 932 }
 933 #endif
 934
 935 static struct platform_driver mv_otg_driver = {
 936         .probe = mv_otg_probe,
 937         .remove = __exit_p(mv_otg_remove),
 938         .driver = {
 939                    .owner = THIS_MODULE,
 940                    .name = driver_name,
 941                    },
 942 #ifdef CONFIG_PM
 943         .suspend = mv_otg_suspend,
 944         .resume = mv_otg_resume,
 945 #endif
 946 };
 947
 948 static int __init mv_otg_init(void)
 949 {
 950         return platform_driver_register(&mv_otg_driver);
 951 }
 952
 953 static void __exit mv_otg_exit(void)
 954 {
 955         platform_driver_unregister(&mv_otg_driver);
 956 }
 957
 958 module_init(mv_otg_init);
 959 module_exit(mv_otg_exit);