kernel/drivers/usb/gadget/udc/mv_u3d_core.c

   1 /*
   2  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/dmapool.h>
  12 #include <linux/kernel.h>
  13 #include <linux/delay.h>
  14 #include <linux/ioport.h>
  15 #include <linux/sched.h>
  16 #include <linux/slab.h>
  17 #include <linux/errno.h>
  18 #include <linux/timer.h>
  19 #include <linux/list.h>
  20 #include <linux/notifier.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/device.h>
  24 #include <linux/usb/ch9.h>
  25 #include <linux/usb/gadget.h>
  26 #include <linux/pm.h>
  27 #include <linux/io.h>
  28 #include <linux/irq.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/platform_data/mv_usb.h>
  31 #include <linux/clk.h>
  32
  33 #include "mv_u3d.h"
  34
  35 #define DRIVER_DESC             "Marvell PXA USB3.0 Device Controller driver"
  36
  37 static const char driver_name[] = "mv_u3d";
  38 static const char driver_desc[] = DRIVER_DESC;
  39
  40 static void mv_u3d_nuke(struct mv_u3d_ep *ep, int status);
  41 static void mv_u3d_stop_activity(struct mv_u3d *u3d,
  42                         struct usb_gadget_driver *driver);
  43
  44 /* for endpoint 0 operations */
  45 static const struct usb_endpoint_descriptor mv_u3d_ep0_desc = {
  46         .bLength =              USB_DT_ENDPOINT_SIZE,
  47         .bDescriptorType =      USB_DT_ENDPOINT,
  48         .bEndpointAddress =     0,
  49         .bmAttributes =         USB_ENDPOINT_XFER_CONTROL,
  50         .wMaxPacketSize =       MV_U3D_EP0_MAX_PKT_SIZE,
  51 };
  52
  53 static void mv_u3d_ep0_reset(struct mv_u3d *u3d)
  54 {
  55         struct mv_u3d_ep *ep;
  56         u32 epxcr;
  57         int i;
  58
  59         for (i = 0; i < 2; i++) {
  60                 ep = &u3d->eps[i];
  61                 ep->u3d = u3d;
  62
  63                 /* ep0 ep context, ep0 in and out share the same ep context */
  64                 ep->ep_context = &u3d->ep_context[1];
  65         }
  66
  67         /* reset ep state machine */
  68         /* reset ep0 out */
  69         epxcr = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0);
  70         epxcr |= MV_U3D_EPXCR_EP_INIT;
  71         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr0);
  72         udelay(5);
  73         epxcr &= ~MV_U3D_EPXCR_EP_INIT;
  74         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr0);
  75
  76         epxcr = ((MV_U3D_EP0_MAX_PKT_SIZE
  77                 << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT)
  78                 | (1 << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT)
  79                 | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
  80                 | MV_U3D_EPXCR_EP_TYPE_CONTROL);
  81         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr1);
  82
  83         /* reset ep0 in */
  84         epxcr = ioread32(&u3d->vuc_regs->epcr[0].epxincr0);
  85         epxcr |= MV_U3D_EPXCR_EP_INIT;
  86         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr0);
  87         udelay(5);
  88         epxcr &= ~MV_U3D_EPXCR_EP_INIT;
  89         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr0);
  90
  91         epxcr = ((MV_U3D_EP0_MAX_PKT_SIZE
  92                 << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT)
  93                 | (1 << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT)
  94                 | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
  95                 | MV_U3D_EPXCR_EP_TYPE_CONTROL);
  96         iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr1);
  97 }
  98
  99 static void mv_u3d_ep0_stall(struct mv_u3d *u3d)
 100 {
 101         u32 tmp;
 102         dev_dbg(u3d->dev, "%s\n", __func__);
 103
 104         /* set TX and RX to stall */
 105         tmp = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0);
 106         tmp |= MV_U3D_EPXCR_EP_HALT;
 107         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0);
 108
 109         tmp = ioread32(&u3d->vuc_regs->epcr[0].epxincr0);
 110         tmp |= MV_U3D_EPXCR_EP_HALT;
 111         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0);
 112
 113         /* update ep0 state */
 114         u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP;
 115         u3d->ep0_dir = MV_U3D_EP_DIR_OUT;
 116 }
 117
 118 static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index,
 119         struct mv_u3d_req *curr_req)
 120 {
 121         struct mv_u3d_trb       *curr_trb;
 122         dma_addr_t cur_deq_lo;
 123         struct mv_u3d_ep_context        *curr_ep_context;
 124         int trb_complete, actual, remaining_length = 0;
 125         int direction, ep_num;
 126         int retval = 0;
 127         u32 tmp, status, length;
 128
 129         curr_ep_context = &u3d->ep_context[index];
 130         direction = index % 2;
 131         ep_num = index / 2;
 132
 133         trb_complete = 0;
 134         actual = curr_req->req.length;
 135
 136         while (!list_empty(&curr_req->trb_list)) {
 137                 curr_trb = list_entry(curr_req->trb_list.next,
 138                                         struct mv_u3d_trb, trb_list);
 139                 if (!curr_trb->trb_hw->ctrl.own) {
 140                         dev_err(u3d->dev, "%s, TRB own error!\n",
 141                                 u3d->eps[index].name);
 142                         return 1;
 143                 }
 144
 145                 curr_trb->trb_hw->ctrl.own = 0;
 146                 if (direction == MV_U3D_EP_DIR_OUT) {
 147                         tmp = ioread32(&u3d->vuc_regs->rxst[ep_num].statuslo);
 148                         cur_deq_lo =
 149                                 ioread32(&u3d->vuc_regs->rxst[ep_num].curdeqlo);
 150                 } else {
 151                         tmp = ioread32(&u3d->vuc_regs->txst[ep_num].statuslo);
 152                         cur_deq_lo =
 153                                 ioread32(&u3d->vuc_regs->txst[ep_num].curdeqlo);
 154                 }
 155
 156                 status = tmp >> MV_U3D_XFERSTATUS_COMPLETE_SHIFT;
 157                 length = tmp & MV_U3D_XFERSTATUS_TRB_LENGTH_MASK;
 158
 159                 if (status == MV_U3D_COMPLETE_SUCCESS ||
 160                         (status == MV_U3D_COMPLETE_SHORT_PACKET &&
 161                         direction == MV_U3D_EP_DIR_OUT)) {
 162                         remaining_length += length;
 163                         actual -= remaining_length;
 164                 } else {
 165                         dev_err(u3d->dev,
 166                                 "complete_tr error: ep=%d %s: error = 0x%x\n",
 167                                 index >> 1, direction ? "SEND" : "RECV",
 168                                 status);
 169                         retval = -EPROTO;
 170                 }
 171
 172                 list_del_init(&curr_trb->trb_list);
 173         }
 174         if (retval)
 175                 return retval;
 176
 177         curr_req->req.actual = actual;
 178         return 0;
 179 }
 180
 181 /*
 182  * mv_u3d_done() - retire a request; caller blocked irqs
 183  * @status : request status to be set, only works when
 184  * request is still in progress.
 185  */
 186 static
 187 void mv_u3d_done(struct mv_u3d_ep *ep, struct mv_u3d_req *req, int status)
 188         __releases(&ep->udc->lock)
 189         __acquires(&ep->udc->lock)
 190 {
 191         struct mv_u3d *u3d = (struct mv_u3d *)ep->u3d;
 192
 193         dev_dbg(u3d->dev, "mv_u3d_done: remove req->queue\n");
 194         /* Removed the req from ep queue */
 195         list_del_init(&req->queue);
 196
 197         /* req.status should be set as -EINPROGRESS in ep_queue() */
 198         if (req->req.status == -EINPROGRESS)
 199                 req->req.status = status;
 200         else
 201                 status = req->req.status;
 202
 203         /* Free trb for the request */
 204         if (!req->chain)
 205                 dma_pool_free(u3d->trb_pool,
 206                         req->trb_head->trb_hw, req->trb_head->trb_dma);
 207         else {
 208                 dma_unmap_single(ep->u3d->gadget.dev.parent,
 209                         (dma_addr_t)req->trb_head->trb_dma,
 210                         req->trb_count * sizeof(struct mv_u3d_trb_hw),
 211                         DMA_BIDIRECTIONAL);
 212                 kfree(req->trb_head->trb_hw);
 213         }
 214         kfree(req->trb_head);
 215
 216         usb_gadget_unmap_request(&u3d->gadget, &req->req, mv_u3d_ep_dir(ep));
 217
 218         if (status && (status != -ESHUTDOWN)) {
 219                 dev_dbg(u3d->dev, "complete %s req %p stat %d len %u/%u",
 220                         ep->ep.name, &req->req, status,
 221                         req->req.actual, req->req.length);
 222         }
 223
 224         spin_unlock(&ep->u3d->lock);
 225
 226         usb_gadget_giveback_request(&ep->ep, &req->req);
 227
 228         spin_lock(&ep->u3d->lock);
 229 }
 230
 231 static int mv_u3d_queue_trb(struct mv_u3d_ep *ep, struct mv_u3d_req *req)
 232 {
 233         u32 tmp, direction;
 234         struct mv_u3d *u3d;
 235         struct mv_u3d_ep_context *ep_context;
 236         int retval = 0;
 237
 238         u3d = ep->u3d;
 239         direction = mv_u3d_ep_dir(ep);
 240
 241         /* ep0 in and out share the same ep context slot 1*/
 242         if (ep->ep_num == 0)
 243                 ep_context = &(u3d->ep_context[1]);
 244         else
 245                 ep_context = &(u3d->ep_context[ep->ep_num * 2 + direction]);
 246
 247         /* check if the pipe is empty or not */
 248         if (!list_empty(&ep->queue)) {
 249                 dev_err(u3d->dev, "add trb to non-empty queue!\n");
 250                 retval = -ENOMEM;
 251                 WARN_ON(1);
 252         } else {
 253                 ep_context->rsvd0 = cpu_to_le32(1);
 254                 ep_context->rsvd1 = 0;
 255
 256                 /* Configure the trb address and set the DCS bit.
 257                  * Both DCS bit and own bit in trb should be set.
 258                  */
 259                 ep_context->trb_addr_lo =
 260                         cpu_to_le32(req->trb_head->trb_dma | DCS_ENABLE);
 261                 ep_context->trb_addr_hi = 0;
 262
 263                 /* Ensure that updates to the EP Context will
 264                  * occure before Ring Bell.
 265                  */
 266                 wmb();
 267
 268                 /* ring bell the ep */
 269                 if (ep->ep_num == 0)
 270                         tmp = 0x1;
 271                 else
 272                         tmp = ep->ep_num * 2
 273                                 + ((direction == MV_U3D_EP_DIR_OUT) ? 0 : 1);
 274
 275                 iowrite32(tmp, &u3d->op_regs->doorbell);
 276         }
 277         return retval;
 278 }
 279
 280 static struct mv_u3d_trb *mv_u3d_build_trb_one(struct mv_u3d_req *req,
 281                                 unsigned *length, dma_addr_t *dma)
 282 {
 283         u32 temp;
 284         unsigned int direction;
 285         struct mv_u3d_trb *trb;
 286         struct mv_u3d_trb_hw *trb_hw;
 287         struct mv_u3d *u3d;
 288
 289         /* how big will this transfer be? */
 290         *length = req->req.length - req->req.actual;
 291         BUG_ON(*length > (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER);
 292
 293         u3d = req->ep->u3d;
 294
 295         trb = kzalloc(sizeof(*trb), GFP_ATOMIC);
 296         if (!trb)
 297                 return NULL;
 298
 299         /*
 300          * Be careful that no _GFP_HIGHMEM is set,
 301          * or we can not use dma_to_virt
 302          * cannot use GFP_KERNEL in spin lock
 303          */
 304         trb_hw = dma_pool_alloc(u3d->trb_pool, GFP_ATOMIC, dma);
 305         if (!trb_hw) {
 306                 kfree(trb);
 307                 dev_err(u3d->dev,
 308                         "%s, dma_pool_alloc fail\n", __func__);
 309                 return NULL;
 310         }
 311         trb->trb_dma = *dma;
 312         trb->trb_hw = trb_hw;
 313
 314         /* initialize buffer page pointers */
 315         temp = (u32)(req->req.dma + req->req.actual);
 316
 317         trb_hw->buf_addr_lo = cpu_to_le32(temp);
 318         trb_hw->buf_addr_hi = 0;
 319         trb_hw->trb_len = cpu_to_le32(*length);
 320         trb_hw->ctrl.own = 1;
 321
 322         if (req->ep->ep_num == 0)
 323                 trb_hw->ctrl.type = TYPE_DATA;
 324         else
 325                 trb_hw->ctrl.type = TYPE_NORMAL;
 326
 327         req->req.actual += *length;
 328
 329         direction = mv_u3d_ep_dir(req->ep);
 330         if (direction == MV_U3D_EP_DIR_IN)
 331                 trb_hw->ctrl.dir = 1;
 332         else
 333                 trb_hw->ctrl.dir = 0;
 334
 335         /* Enable interrupt for the last trb of a request */
 336         if (!req->req.no_interrupt)
 337                 trb_hw->ctrl.ioc = 1;
 338
 339         trb_hw->ctrl.chain = 0;
 340
 341         wmb();
 342         return trb;
 343 }
 344
 345 static int mv_u3d_build_trb_chain(struct mv_u3d_req *req, unsigned *length,
 346                 struct mv_u3d_trb *trb, int *is_last)
 347 {
 348         u32 temp;
 349         unsigned int direction;
 350         struct mv_u3d *u3d;
 351
 352         /* how big will this transfer be? */
 353         *length = min(req->req.length - req->req.actual,
 354                         (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER);
 355
 356         u3d = req->ep->u3d;
 357
 358         trb->trb_dma = 0;
 359
 360         /* initialize buffer page pointers */
 361         temp = (u32)(req->req.dma + req->req.actual);
 362
 363         trb->trb_hw->buf_addr_lo = cpu_to_le32(temp);
 364         trb->trb_hw->buf_addr_hi = 0;
 365         trb->trb_hw->trb_len = cpu_to_le32(*length);
 366         trb->trb_hw->ctrl.own = 1;
 367
 368         if (req->ep->ep_num == 0)
 369                 trb->trb_hw->ctrl.type = TYPE_DATA;
 370         else
 371                 trb->trb_hw->ctrl.type = TYPE_NORMAL;
 372
 373         req->req.actual += *length;
 374
 375         direction = mv_u3d_ep_dir(req->ep);
 376         if (direction == MV_U3D_EP_DIR_IN)
 377                 trb->trb_hw->ctrl.dir = 1;
 378         else
 379                 trb->trb_hw->ctrl.dir = 0;
 380
 381         /* zlp is needed if req->req.zero is set */
 382         if (req->req.zero) {
 383                 if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
 384                         *is_last = 1;
 385                 else
 386                         *is_last = 0;
 387         } else if (req->req.length == req->req.actual)
 388                 *is_last = 1;
 389         else
 390                 *is_last = 0;
 391
 392         /* Enable interrupt for the last trb of a request */
 393         if (*is_last && !req->req.no_interrupt)
 394                 trb->trb_hw->ctrl.ioc = 1;
 395
 396         if (*is_last)
 397                 trb->trb_hw->ctrl.chain = 0;
 398         else {
 399                 trb->trb_hw->ctrl.chain = 1;
 400                 dev_dbg(u3d->dev, "chain trb\n");
 401         }
 402
 403         wmb();
 404
 405         return 0;
 406 }
 407
 408 /* generate TRB linked list for a request
 409  * usb controller only supports continous trb chain,
 410  * that trb structure physical address should be continous.
 411  */
 412 static int mv_u3d_req_to_trb(struct mv_u3d_req *req)
 413 {
 414         unsigned count;
 415         int is_last;
 416         struct mv_u3d_trb *trb;
 417         struct mv_u3d_trb_hw *trb_hw;
 418         struct mv_u3d *u3d;
 419         dma_addr_t dma;
 420         unsigned length;
 421         unsigned trb_num;
 422
 423         u3d = req->ep->u3d;
 424
 425         INIT_LIST_HEAD(&req->trb_list);
 426
 427         length = req->req.length - req->req.actual;
 428         /* normally the request transfer length is less than 16KB.
 429          * we use buil_trb_one() to optimize it.
 430          */
 431         if (length <= (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER) {
 432                 trb = mv_u3d_build_trb_one(req, &count, &dma);
 433                 list_add_tail(&trb->trb_list, &req->trb_list);
 434                 req->trb_head = trb;
 435                 req->trb_count = 1;
 436                 req->chain = 0;
 437         } else {
 438                 trb_num = length / MV_U3D_EP_MAX_LENGTH_TRANSFER;
 439                 if (length % MV_U3D_EP_MAX_LENGTH_TRANSFER)
 440                         trb_num++;
 441
 442                 trb = kcalloc(trb_num, sizeof(*trb), GFP_ATOMIC);
 443                 if (!trb)
 444                         return -ENOMEM;
 445
 446                 trb_hw = kcalloc(trb_num, sizeof(*trb_hw), GFP_ATOMIC);
 447                 if (!trb_hw) {
 448                         kfree(trb);
 449                         return -ENOMEM;
 450                 }
 451
 452                 do {
 453                         trb->trb_hw = trb_hw;
 454                         if (mv_u3d_build_trb_chain(req, &count,
 455                                                 trb, &is_last)) {
 456                                 dev_err(u3d->dev,
 457                                         "%s, mv_u3d_build_trb_chain fail\n",
 458                                         __func__);
 459                                 return -EIO;
 460                         }
 461
 462                         list_add_tail(&trb->trb_list, &req->trb_list);
 463                         req->trb_count++;
 464                         trb++;
 465                         trb_hw++;
 466                 } while (!is_last);
 467
 468                 req->trb_head = list_entry(req->trb_list.next,
 469                                         struct mv_u3d_trb, trb_list);
 470                 req->trb_head->trb_dma = dma_map_single(u3d->gadget.dev.parent,
 471                                         req->trb_head->trb_hw,
 472                                         trb_num * sizeof(*trb_hw),
 473                                         DMA_BIDIRECTIONAL);
 474
 475                 req->chain = 1;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static int
 482 mv_u3d_start_queue(struct mv_u3d_ep *ep)
 483 {
 484         struct mv_u3d *u3d = ep->u3d;
 485         struct mv_u3d_req *req;
 486         int ret;
 487
 488         if (!list_empty(&ep->req_list) && !ep->processing)
 489                 req = list_entry(ep->req_list.next, struct mv_u3d_req, list);
 490         else
 491                 return 0;
 492
 493         ep->processing = 1;
 494
 495         /* set up dma mapping */
 496         ret = usb_gadget_map_request(&u3d->gadget, &req->req,
 497                                         mv_u3d_ep_dir(ep));
 498         if (ret)
 499                 return ret;
 500
 501         req->req.status = -EINPROGRESS;
 502         req->req.actual = 0;
 503         req->trb_count = 0;
 504
 505         /* build trbs and push them to device queue */
 506         if (!mv_u3d_req_to_trb(req)) {
 507                 ret = mv_u3d_queue_trb(ep, req);
 508                 if (ret) {
 509                         ep->processing = 0;
 510                         return ret;
 511                 }
 512         } else {
 513                 ep->processing = 0;
 514                 dev_err(u3d->dev, "%s, mv_u3d_req_to_trb fail\n", __func__);
 515                 return -ENOMEM;
 516         }
 517
 518         /* irq handler advances the queue */
 519         if (req)
 520                 list_add_tail(&req->queue, &ep->queue);
 521
 522         return 0;
 523 }
 524
 525 static int mv_u3d_ep_enable(struct usb_ep *_ep,
 526                 const struct usb_endpoint_descriptor *desc)
 527 {
 528         struct mv_u3d *u3d;
 529         struct mv_u3d_ep *ep;
 530         struct mv_u3d_ep_context *ep_context;
 531         u16 max = 0;
 532         unsigned maxburst = 0;
 533         u32 epxcr, direction;
 534
 535         if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT)
 536                 return -EINVAL;
 537
 538         ep = container_of(_ep, struct mv_u3d_ep, ep);
 539         u3d = ep->u3d;
 540
 541         if (!u3d->driver || u3d->gadget.speed == USB_SPEED_UNKNOWN)
 542                 return -ESHUTDOWN;
 543
 544         direction = mv_u3d_ep_dir(ep);
 545         max = le16_to_cpu(desc->wMaxPacketSize);
 546
 547         if (!_ep->maxburst)
 548                 _ep->maxburst = 1;
 549         maxburst = _ep->maxburst;
 550
 551         /* Get the endpoint context address */
 552         ep_context = (struct mv_u3d_ep_context *)ep->ep_context;
 553
 554         /* Set the max burst size */
 555         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 556         case USB_ENDPOINT_XFER_BULK:
 557                 if (maxburst > 16) {
 558                         dev_dbg(u3d->dev,
 559                                 "max burst should not be greater "
 560                                 "than 16 on bulk ep\n");
 561                         maxburst = 1;
 562                         _ep->maxburst = maxburst;
 563                 }
 564                 dev_dbg(u3d->dev,
 565                         "maxburst: %d on bulk %s\n", maxburst, ep->name);
 566                 break;
 567         case USB_ENDPOINT_XFER_CONTROL:
 568                 /* control transfer only supports maxburst as one */
 569                 maxburst = 1;
 570                 _ep->maxburst = maxburst;
 571                 break;
 572         case USB_ENDPOINT_XFER_INT:
 573                 if (maxburst != 1) {
 574                         dev_dbg(u3d->dev,
 575                                 "max burst should be 1 on int ep "
 576                                 "if transfer size is not 1024\n");
 577                         maxburst = 1;
 578                         _ep->maxburst = maxburst;
 579                 }
 580                 break;
 581         case USB_ENDPOINT_XFER_ISOC:
 582                 if (maxburst != 1) {
 583                         dev_dbg(u3d->dev,
 584                                 "max burst should be 1 on isoc ep "
 585                                 "if transfer size is not 1024\n");
 586                         maxburst = 1;
 587                         _ep->maxburst = maxburst;
 588                 }
 589                 break;
 590         default:
 591                 goto en_done;
 592         }
 593
 594         ep->ep.maxpacket = max;
 595         ep->ep.desc = desc;
 596         ep->enabled = 1;
 597
 598         /* Enable the endpoint for Rx or Tx and set the endpoint type */
 599         if (direction == MV_U3D_EP_DIR_OUT) {
 600                 epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 601                 epxcr |= MV_U3D_EPXCR_EP_INIT;
 602                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 603                 udelay(5);
 604                 epxcr &= ~MV_U3D_EPXCR_EP_INIT;
 605                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 606
 607                 epxcr = ((max << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT)
 608                       | ((maxburst - 1) << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT)
 609                       | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
 610                       | (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK));
 611                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1);
 612         } else {
 613                 epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 614                 epxcr |= MV_U3D_EPXCR_EP_INIT;
 615                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 616                 udelay(5);
 617                 epxcr &= ~MV_U3D_EPXCR_EP_INIT;
 618                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 619
 620                 epxcr = ((max << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT)
 621                       | ((maxburst - 1) << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT)
 622                       | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
 623                       | (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK));
 624                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr1);
 625         }
 626
 627         return 0;
 628 en_done:
 629         return -EINVAL;
 630 }
 631
 632 static int  mv_u3d_ep_disable(struct usb_ep *_ep)
 633 {
 634         struct mv_u3d *u3d;
 635         struct mv_u3d_ep *ep;
 636         struct mv_u3d_ep_context *ep_context;
 637         u32 epxcr, direction;
 638         unsigned long flags;
 639
 640         if (!_ep)
 641                 return -EINVAL;
 642
 643         ep = container_of(_ep, struct mv_u3d_ep, ep);
 644         if (!ep->ep.desc)
 645                 return -EINVAL;
 646
 647         u3d = ep->u3d;
 648
 649         /* Get the endpoint context address */
 650         ep_context = ep->ep_context;
 651
 652         direction = mv_u3d_ep_dir(ep);
 653
 654         /* nuke all pending requests (does flush) */
 655         spin_lock_irqsave(&u3d->lock, flags);
 656         mv_u3d_nuke(ep, -ESHUTDOWN);
 657         spin_unlock_irqrestore(&u3d->lock, flags);
 658
 659         /* Disable the endpoint for Rx or Tx and reset the endpoint type */
 660         if (direction == MV_U3D_EP_DIR_OUT) {
 661                 epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1);
 662                 epxcr &= ~((1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
 663                       | USB_ENDPOINT_XFERTYPE_MASK);
 664                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1);
 665         } else {
 666                 epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr1);
 667                 epxcr &= ~((1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT)
 668                       | USB_ENDPOINT_XFERTYPE_MASK);
 669                 iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr1);
 670         }
 671
 672         ep->enabled = 0;
 673
 674         ep->ep.desc = NULL;
 675         return 0;
 676 }
 677
 678 static struct usb_request *
 679 mv_u3d_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 680 {
 681         struct mv_u3d_req *req = NULL;
 682
 683         req = kzalloc(sizeof *req, gfp_flags);
 684         if (!req)
 685                 return NULL;
 686
 687         INIT_LIST_HEAD(&req->queue);
 688
 689         return &req->req;
 690 }
 691
 692 static void mv_u3d_free_request(struct usb_ep *_ep, struct usb_request *_req)
 693 {
 694         struct mv_u3d_req *req = container_of(_req, struct mv_u3d_req, req);
 695
 696         kfree(req);
 697 }
 698
 699 static void mv_u3d_ep_fifo_flush(struct usb_ep *_ep)
 700 {
 701         struct mv_u3d *u3d;
 702         u32 direction;
 703         struct mv_u3d_ep *ep = container_of(_ep, struct mv_u3d_ep, ep);
 704         unsigned int loops;
 705         u32 tmp;
 706
 707         /* if endpoint is not enabled, cannot flush endpoint */
 708         if (!ep->enabled)
 709                 return;
 710
 711         u3d = ep->u3d;
 712         direction = mv_u3d_ep_dir(ep);
 713
 714         /* ep0 need clear bit after flushing fifo. */
 715         if (!ep->ep_num) {
 716                 if (direction == MV_U3D_EP_DIR_OUT) {
 717                         tmp = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0);
 718                         tmp |= MV_U3D_EPXCR_EP_FLUSH;
 719                         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0);
 720                         udelay(10);
 721                         tmp &= ~MV_U3D_EPXCR_EP_FLUSH;
 722                         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0);
 723                 } else {
 724                         tmp = ioread32(&u3d->vuc_regs->epcr[0].epxincr0);
 725                         tmp |= MV_U3D_EPXCR_EP_FLUSH;
 726                         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0);
 727                         udelay(10);
 728                         tmp &= ~MV_U3D_EPXCR_EP_FLUSH;
 729                         iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0);
 730                 }
 731                 return;
 732         }
 733
 734         if (direction == MV_U3D_EP_DIR_OUT) {
 735                 tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 736                 tmp |= MV_U3D_EPXCR_EP_FLUSH;
 737                 iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 738
 739                 /* Wait until flushing completed */
 740                 loops = LOOPS(MV_U3D_FLUSH_TIMEOUT);
 741                 while (ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0) &
 742                         MV_U3D_EPXCR_EP_FLUSH) {
 743                         /*
 744                          * EP_FLUSH bit should be cleared to indicate this
 745                          * operation is complete
 746                          */
 747                         if (loops == 0) {
 748                                 dev_dbg(u3d->dev,
 749                                     "EP FLUSH TIMEOUT for ep%d%s\n", ep->ep_num,
 750                                     direction ? "in" : "out");
 751                                 return;
 752                         }
 753                         loops--;
 754                         udelay(LOOPS_USEC);
 755                 }
 756         } else {        /* EP_DIR_IN */
 757                 tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 758                 tmp |= MV_U3D_EPXCR_EP_FLUSH;
 759                 iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 760
 761                 /* Wait until flushing completed */
 762                 loops = LOOPS(MV_U3D_FLUSH_TIMEOUT);
 763                 while (ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0) &
 764                         MV_U3D_EPXCR_EP_FLUSH) {
 765                         /*
 766                         * EP_FLUSH bit should be cleared to indicate this
 767                         * operation is complete
 768                         */
 769                         if (loops == 0) {
 770                                 dev_dbg(u3d->dev,
 771                                     "EP FLUSH TIMEOUT for ep%d%s\n", ep->ep_num,
 772                                     direction ? "in" : "out");
 773                                 return;
 774                         }
 775                         loops--;
 776                         udelay(LOOPS_USEC);
 777                 }
 778         }
 779 }
 780
 781 /* queues (submits) an I/O request to an endpoint */
 782 static int
 783 mv_u3d_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 784 {
 785         struct mv_u3d_ep *ep;
 786         struct mv_u3d_req *req;
 787         struct mv_u3d *u3d;
 788         unsigned long flags;
 789         int is_first_req = 0;
 790
 791         if (unlikely(!_ep || !_req))
 792                 return -EINVAL;
 793
 794         ep = container_of(_ep, struct mv_u3d_ep, ep);
 795         u3d = ep->u3d;
 796
 797         req = container_of(_req, struct mv_u3d_req, req);
 798
 799         if (!ep->ep_num
 800                 && u3d->ep0_state == MV_U3D_STATUS_STAGE
 801                 && !_req->length) {
 802                 dev_dbg(u3d->dev, "ep0 status stage\n");
 803                 u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP;
 804                 return 0;
 805         }
 806
 807         dev_dbg(u3d->dev, "%s: %s, req: 0x%p\n",
 808                         __func__, _ep->name, req);
 809
 810         /* catch various bogus parameters */
 811         if (!req->req.complete || !req->req.buf
 812                         || !list_empty(&req->queue)) {
 813                 dev_err(u3d->dev,
 814                         "%s, bad params, _req: 0x%p,"
 815                         "req->req.complete: 0x%p, req->req.buf: 0x%p,"
 816                         "list_empty: 0x%x\n",
 817                         __func__, _req,
 818                         req->req.complete, req->req.buf,
 819                         list_empty(&req->queue));
 820                 return -EINVAL;
 821         }
 822         if (unlikely(!ep->ep.desc)) {
 823                 dev_err(u3d->dev, "%s, bad ep\n", __func__);
 824                 return -EINVAL;
 825         }
 826         if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 827                 if (req->req.length > ep->ep.maxpacket)
 828                         return -EMSGSIZE;
 829         }
 830
 831         if (!u3d->driver || u3d->gadget.speed == USB_SPEED_UNKNOWN) {
 832                 dev_err(u3d->dev,
 833                         "bad params of driver/speed\n");
 834                 return -ESHUTDOWN;
 835         }
 836
 837         req->ep = ep;
 838
 839         /* Software list handles usb request. */
 840         spin_lock_irqsave(&ep->req_lock, flags);
 841         is_first_req = list_empty(&ep->req_list);
 842         list_add_tail(&req->list, &ep->req_list);
 843         spin_unlock_irqrestore(&ep->req_lock, flags);
 844         if (!is_first_req) {
 845                 dev_dbg(u3d->dev, "list is not empty\n");
 846                 return 0;
 847         }
 848
 849         dev_dbg(u3d->dev, "call mv_u3d_start_queue from usb_ep_queue\n");
 850         spin_lock_irqsave(&u3d->lock, flags);
 851         mv_u3d_start_queue(ep);
 852         spin_unlock_irqrestore(&u3d->lock, flags);
 853         return 0;
 854 }
 855
 856 /* dequeues (cancels, unlinks) an I/O request from an endpoint */
 857 static int mv_u3d_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 858 {
 859         struct mv_u3d_ep *ep;
 860         struct mv_u3d_req *req;
 861         struct mv_u3d *u3d;
 862         struct mv_u3d_ep_context *ep_context;
 863         struct mv_u3d_req *next_req;
 864
 865         unsigned long flags;
 866         int ret = 0;
 867
 868         if (!_ep || !_req)
 869                 return -EINVAL;
 870
 871         ep = container_of(_ep, struct mv_u3d_ep, ep);
 872         u3d = ep->u3d;
 873
 874         spin_lock_irqsave(&ep->u3d->lock, flags);
 875
 876         /* make sure it's actually queued on this endpoint */
 877         list_for_each_entry(req, &ep->queue, queue) {
 878                 if (&req->req == _req)
 879                         break;
 880         }
 881         if (&req->req != _req) {
 882                 ret = -EINVAL;
 883                 goto out;
 884         }
 885
 886         /* The request is in progress, or completed but not dequeued */
 887         if (ep->queue.next == &req->queue) {
 888                 _req->status = -ECONNRESET;
 889                 mv_u3d_ep_fifo_flush(_ep);
 890
 891                 /* The request isn't the last request in this ep queue */
 892                 if (req->queue.next != &ep->queue) {
 893                         dev_dbg(u3d->dev,
 894                                 "it is the last request in this ep queue\n");
 895                         ep_context = ep->ep_context;
 896                         next_req = list_entry(req->queue.next,
 897                                         struct mv_u3d_req, queue);
 898
 899                         /* Point first TRB of next request to the EP context. */
 900                         iowrite32((unsigned long) next_req->trb_head,
 901                                         &ep_context->trb_addr_lo);
 902                 } else {
 903                         struct mv_u3d_ep_context *ep_context;
 904                         ep_context = ep->ep_context;
 905                         ep_context->trb_addr_lo = 0;
 906                         ep_context->trb_addr_hi = 0;
 907                 }
 908
 909         } else
 910                 WARN_ON(1);
 911
 912         mv_u3d_done(ep, req, -ECONNRESET);
 913
 914         /* remove the req from the ep req list */
 915         if (!list_empty(&ep->req_list)) {
 916                 struct mv_u3d_req *curr_req;
 917                 curr_req = list_entry(ep->req_list.next,
 918                                         struct mv_u3d_req, list);
 919                 if (curr_req == req) {
 920                         list_del_init(&req->list);
 921                         ep->processing = 0;
 922                 }
 923         }
 924
 925 out:
 926         spin_unlock_irqrestore(&ep->u3d->lock, flags);
 927         return ret;
 928 }
 929
 930 static void
 931 mv_u3d_ep_set_stall(struct mv_u3d *u3d, u8 ep_num, u8 direction, int stall)
 932 {
 933         u32 tmp;
 934         struct mv_u3d_ep *ep = u3d->eps;
 935
 936         dev_dbg(u3d->dev, "%s\n", __func__);
 937         if (direction == MV_U3D_EP_DIR_OUT) {
 938                 tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 939                 if (stall)
 940                         tmp |= MV_U3D_EPXCR_EP_HALT;
 941                 else
 942                         tmp &= ~MV_U3D_EPXCR_EP_HALT;
 943                 iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0);
 944         } else {
 945                 tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 946                 if (stall)
 947                         tmp |= MV_U3D_EPXCR_EP_HALT;
 948                 else
 949                         tmp &= ~MV_U3D_EPXCR_EP_HALT;
 950                 iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0);
 951         }
 952 }
 953
 954 static int mv_u3d_ep_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge)
 955 {
 956         struct mv_u3d_ep *ep;
 957         unsigned long flags = 0;
 958         int status = 0;
 959         struct mv_u3d *u3d;
 960
 961         ep = container_of(_ep, struct mv_u3d_ep, ep);
 962         u3d = ep->u3d;
 963         if (!ep->ep.desc) {
 964                 status = -EINVAL;
 965                 goto out;
 966         }
 967
 968         if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 969                 status = -EOPNOTSUPP;
 970                 goto out;
 971         }
 972
 973         /*
 974          * Attempt to halt IN ep will fail if any transfer requests
 975          * are still queue
 976          */
 977         if (halt && (mv_u3d_ep_dir(ep) == MV_U3D_EP_DIR_IN)
 978                         && !list_empty(&ep->queue)) {
 979                 status = -EAGAIN;
 980                 goto out;
 981         }
 982
 983         spin_lock_irqsave(&ep->u3d->lock, flags);
 984         mv_u3d_ep_set_stall(u3d, ep->ep_num, mv_u3d_ep_dir(ep), halt);
 985         if (halt && wedge)
 986                 ep->wedge = 1;
 987         else if (!halt)
 988                 ep->wedge = 0;
 989         spin_unlock_irqrestore(&ep->u3d->lock, flags);
 990
 991         if (ep->ep_num == 0)
 992                 u3d->ep0_dir = MV_U3D_EP_DIR_OUT;
 993 out:
 994         return status;
 995 }
 996
 997 static int mv_u3d_ep_set_halt(struct usb_ep *_ep, int halt)
 998 {
 999         return mv_u3d_ep_set_halt_wedge(_ep, halt, 0);
1000 }
1001
1002 static int mv_u3d_ep_set_wedge(struct usb_ep *_ep)
1003 {
1004         return mv_u3d_ep_set_halt_wedge(_ep, 1, 1);
1005 }
1006
1007 static struct usb_ep_ops mv_u3d_ep_ops = {
1008         .enable         = mv_u3d_ep_enable,
1009         .disable        = mv_u3d_ep_disable,
1010
1011         .alloc_request  = mv_u3d_alloc_request,
1012         .free_request   = mv_u3d_free_request,
1013
1014         .queue          = mv_u3d_ep_queue,
1015         .dequeue        = mv_u3d_ep_dequeue,
1016
1017         .set_wedge      = mv_u3d_ep_set_wedge,
1018         .set_halt       = mv_u3d_ep_set_halt,
1019         .fifo_flush     = mv_u3d_ep_fifo_flush,
1020 };
1021
1022 static void mv_u3d_controller_stop(struct mv_u3d *u3d)
1023 {
1024         u32 tmp;
1025
1026         if (!u3d->clock_gating && u3d->vbus_valid_detect)
1027                 iowrite32(MV_U3D_INTR_ENABLE_VBUS_VALID,
1028                                 &u3d->vuc_regs->intrenable);
1029         else
1030                 iowrite32(0, &u3d->vuc_regs->intrenable);
1031         iowrite32(~0x0, &u3d->vuc_regs->endcomplete);
1032         iowrite32(~0x0, &u3d->vuc_regs->trbunderrun);
1033         iowrite32(~0x0, &u3d->vuc_regs->trbcomplete);
1034         iowrite32(~0x0, &u3d->vuc_regs->linkchange);
1035         iowrite32(0x1, &u3d->vuc_regs->setuplock);
1036
1037         /* Reset the RUN bit in the command register to stop USB */
1038         tmp = ioread32(&u3d->op_regs->usbcmd);
1039         tmp &= ~MV_U3D_CMD_RUN_STOP;
1040         iowrite32(tmp, &u3d->op_regs->usbcmd);
1041         dev_dbg(u3d->dev, "after u3d_stop, USBCMD 0x%x\n",
1042                 ioread32(&u3d->op_regs->usbcmd));
1043 }
1044
1045 static void mv_u3d_controller_start(struct mv_u3d *u3d)
1046 {
1047         u32 usbintr;
1048         u32 temp;
1049
1050         /* enable link LTSSM state machine */
1051         temp = ioread32(&u3d->vuc_regs->ltssm);
1052         temp |= MV_U3D_LTSSM_PHY_INIT_DONE;
1053         iowrite32(temp, &u3d->vuc_regs->ltssm);
1054
1055         /* Enable interrupts */
1056         usbintr = MV_U3D_INTR_ENABLE_LINK_CHG | MV_U3D_INTR_ENABLE_TXDESC_ERR |
1057                 MV_U3D_INTR_ENABLE_RXDESC_ERR | MV_U3D_INTR_ENABLE_TX_COMPLETE |
1058                 MV_U3D_INTR_ENABLE_RX_COMPLETE | MV_U3D_INTR_ENABLE_SETUP |
1059                 (u3d->vbus_valid_detect ? MV_U3D_INTR_ENABLE_VBUS_VALID : 0);
1060         iowrite32(usbintr, &u3d->vuc_regs->intrenable);
1061
1062         /* Enable ctrl ep */
1063         iowrite32(0x1, &u3d->vuc_regs->ctrlepenable);
1064
1065         /* Set the Run bit in the command register */
1066         iowrite32(MV_U3D_CMD_RUN_STOP, &u3d->op_regs->usbcmd);
1067         dev_dbg(u3d->dev, "after u3d_start, USBCMD 0x%x\n",
1068                 ioread32(&u3d->op_regs->usbcmd));
1069 }
1070
1071 static int mv_u3d_controller_reset(struct mv_u3d *u3d)
1072 {
1073         unsigned int loops;
1074         u32 tmp;
1075
1076         /* Stop the controller */
1077         tmp = ioread32(&u3d->op_regs->usbcmd);
1078         tmp &= ~MV_U3D_CMD_RUN_STOP;
1079         iowrite32(tmp, &u3d->op_regs->usbcmd);
1080
1081         /* Reset the controller to get default values */
1082         iowrite32(MV_U3D_CMD_CTRL_RESET, &u3d->op_regs->usbcmd);
1083
1084         /* wait for reset to complete */
1085         loops = LOOPS(MV_U3D_RESET_TIMEOUT);
1086         while (ioread32(&u3d->op_regs->usbcmd) & MV_U3D_CMD_CTRL_RESET) {
1087                 if (loops == 0) {
1088                         dev_err(u3d->dev,
1089                                 "Wait for RESET completed TIMEOUT\n");
1090                         return -ETIMEDOUT;
1091                 }
1092                 loops--;
1093                 udelay(LOOPS_USEC);
1094         }
1095
1096         /* Configure the Endpoint Context Address */
1097         iowrite32(u3d->ep_context_dma, &u3d->op_regs->dcbaapl);
1098         iowrite32(0, &u3d->op_regs->dcbaaph);
1099
1100         return 0;
1101 }
1102
1103 static int mv_u3d_enable(struct mv_u3d *u3d)
1104 {
1105         struct mv_usb_platform_data *pdata = dev_get_platdata(u3d->dev);
1106         int retval;
1107
1108         if (u3d->active)
1109                 return 0;
1110
1111         if (!u3d->clock_gating) {
1112                 u3d->active = 1;
1113                 return 0;
1114         }
1115
1116         dev_dbg(u3d->dev, "enable u3d\n");
1117         clk_enable(u3d->clk);
1118         if (pdata->phy_init) {
1119                 retval = pdata->phy_init(u3d->phy_regs);
1120                 if (retval) {
1121                         dev_err(u3d->dev,
1122                                 "init phy error %d\n", retval);
1123                         clk_disable(u3d->clk);
1124                         return retval;
1125                 }
1126         }
1127         u3d->active = 1;
1128
1129         return 0;
1130 }
1131
1132 static void mv_u3d_disable(struct mv_u3d *u3d)
1133 {
1134         struct mv_usb_platform_data *pdata = dev_get_platdata(u3d->dev);
1135         if (u3d->clock_gating && u3d->active) {
1136                 dev_dbg(u3d->dev, "disable u3d\n");
1137                 if (pdata->phy_deinit)
1138                         pdata->phy_deinit(u3d->phy_regs);
1139                 clk_disable(u3d->clk);
1140                 u3d->active = 0;
1141         }
1142 }
1143
1144 static int mv_u3d_vbus_session(struct usb_gadget *gadget, int is_active)
1145 {
1146         struct mv_u3d *u3d;
1147         unsigned long flags;
1148         int retval = 0;
1149
1150         u3d = container_of(gadget, struct mv_u3d, gadget);
1151
1152         spin_lock_irqsave(&u3d->lock, flags);
1153
1154         u3d->vbus_active = (is_active != 0);
1155         dev_dbg(u3d->dev, "%s: softconnect %d, vbus_active %d\n",
1156                 __func__, u3d->softconnect, u3d->vbus_active);
1157         /*
1158          * 1. external VBUS detect: we can disable/enable clock on demand.
1159          * 2. UDC VBUS detect: we have to enable clock all the time.
1160          * 3. No VBUS detect: we have to enable clock all the time.
1161          */
1162         if (u3d->driver && u3d->softconnect && u3d->vbus_active) {
1163                 retval = mv_u3d_enable(u3d);
1164                 if (retval == 0) {
1165                         /*
1166                          * after clock is disabled, we lost all the register
1167                          *  context. We have to re-init registers
1168                          */
1169                         mv_u3d_controller_reset(u3d);
1170                         mv_u3d_ep0_reset(u3d);
1171                         mv_u3d_controller_start(u3d);
1172                 }
1173         } else if (u3d->driver && u3d->softconnect) {
1174                 if (!u3d->active)
1175                         goto out;
1176
1177                 /* stop all the transfer in queue*/
1178                 mv_u3d_stop_activity(u3d, u3d->driver);
1179                 mv_u3d_controller_stop(u3d);
1180                 mv_u3d_disable(u3d);
1181         }
1182
1183 out:
1184         spin_unlock_irqrestore(&u3d->lock, flags);
1185         return retval;
1186 }
1187
1188 /* constrain controller's VBUS power usage
1189  * This call is used by gadget drivers during SET_CONFIGURATION calls,
1190  * reporting how much power the device may consume.  For example, this
1191  * could affect how quickly batteries are recharged.
1192  *
1193  * Returns zero on success, else negative errno.
1194  */
1195 static int mv_u3d_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1196 {
1197         struct mv_u3d *u3d = container_of(gadget, struct mv_u3d, gadget);
1198
1199         u3d->power = mA;
1200
1201         return 0;
1202 }
1203
1204 static int mv_u3d_pullup(struct usb_gadget *gadget, int is_on)
1205 {
1206         struct mv_u3d *u3d = container_of(gadget, struct mv_u3d, gadget);
1207         unsigned long flags;
1208         int retval = 0;
1209
1210         spin_lock_irqsave(&u3d->lock, flags);
1211
1212         dev_dbg(u3d->dev, "%s: softconnect %d, vbus_active %d\n",
1213                 __func__, u3d->softconnect, u3d->vbus_active);
1214         u3d->softconnect = (is_on != 0);
1215         if (u3d->driver && u3d->softconnect && u3d->vbus_active) {
1216                 retval = mv_u3d_enable(u3d);
1217                 if (retval == 0) {
1218                         /*
1219                          * after clock is disabled, we lost all the register
1220                          *  context. We have to re-init registers
1221                          */
1222                         mv_u3d_controller_reset(u3d);
1223                         mv_u3d_ep0_reset(u3d);
1224                         mv_u3d_controller_start(u3d);
1225                 }
1226         } else if (u3d->driver && u3d->vbus_active) {
1227                 /* stop all the transfer in queue*/
1228                 mv_u3d_stop_activity(u3d, u3d->driver);
1229                 mv_u3d_controller_stop(u3d);
1230                 mv_u3d_disable(u3d);
1231         }
1232
1233         spin_unlock_irqrestore(&u3d->lock, flags);
1234
1235         return retval;
1236 }
1237
1238 static int mv_u3d_start(struct usb_gadget *g,
1239                 struct usb_gadget_driver *driver)
1240 {
1241         struct mv_u3d *u3d = container_of(g, struct mv_u3d, gadget);
1242         struct mv_usb_platform_data *pdata = dev_get_platdata(u3d->dev);
1243         unsigned long flags;
1244
1245         if (u3d->driver)
1246                 return -EBUSY;
1247
1248         spin_lock_irqsave(&u3d->lock, flags);
1249
1250         if (!u3d->clock_gating) {
1251                 clk_enable(u3d->clk);
1252                 if (pdata->phy_init)
1253                         pdata->phy_init(u3d->phy_regs);
1254         }
1255
1256         /* hook up the driver ... */
1257         driver->driver.bus = NULL;
1258         u3d->driver = driver;
1259
1260         u3d->ep0_dir = USB_DIR_OUT;
1261
1262         spin_unlock_irqrestore(&u3d->lock, flags);
1263
1264         u3d->vbus_valid_detect = 1;
1265
1266         return 0;
1267 }
1268
1269 static int mv_u3d_stop(struct usb_gadget *g)
1270 {
1271         struct mv_u3d *u3d = container_of(g, struct mv_u3d, gadget);
1272         struct mv_usb_platform_data *pdata = dev_get_platdata(u3d->dev);
1273         unsigned long flags;
1274
1275         u3d->vbus_valid_detect = 0;
1276         spin_lock_irqsave(&u3d->lock, flags);
1277
1278         /* enable clock to access controller register */
1279         clk_enable(u3d->clk);
1280         if (pdata->phy_init)
1281                 pdata->phy_init(u3d->phy_regs);
1282
1283         mv_u3d_controller_stop(u3d);
1284         /* stop all usb activities */
1285         u3d->gadget.speed = USB_SPEED_UNKNOWN;
1286         mv_u3d_stop_activity(u3d, NULL);
1287         mv_u3d_disable(u3d);
1288
1289         if (pdata->phy_deinit)
1290                 pdata->phy_deinit(u3d->phy_regs);
1291         clk_disable(u3d->clk);
1292
1293         spin_unlock_irqrestore(&u3d->lock, flags);
1294
1295         u3d->driver = NULL;
1296
1297         return 0;
1298 }
1299
1300 /* device controller usb_gadget_ops structure */
1301 static const struct usb_gadget_ops mv_u3d_ops = {
1302         /* notify controller that VBUS is powered or not */
1303         .vbus_session   = mv_u3d_vbus_session,
1304
1305         /* constrain controller's VBUS power usage */
1306         .vbus_draw      = mv_u3d_vbus_draw,
1307
1308         .pullup         = mv_u3d_pullup,
1309         .udc_start      = mv_u3d_start,
1310         .udc_stop       = mv_u3d_stop,
1311 };
1312
1313 static int mv_u3d_eps_init(struct mv_u3d *u3d)
1314 {
1315         struct mv_u3d_ep        *ep;
1316         char name[14];
1317         int i;
1318
1319         /* initialize ep0, ep0 in/out use eps[1] */
1320         ep = &u3d->eps[1];
1321         ep->u3d = u3d;
1322         strncpy(ep->name, "ep0", sizeof(ep->name));
1323         ep->ep.name = ep->name;
1324         ep->ep.ops = &mv_u3d_ep_ops;
1325         ep->wedge = 0;
1326         usb_ep_set_maxpacket_limit(&ep->ep, MV_U3D_EP0_MAX_PKT_SIZE);
1327         ep->ep_num = 0;
1328         ep->ep.desc = &mv_u3d_ep0_desc;
1329         INIT_LIST_HEAD(&ep->queue);
1330         INIT_LIST_HEAD(&ep->req_list);
1331         ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
1332
1333         /* add ep0 ep_context */
1334         ep->ep_context = &u3d->ep_context[1];
1335
1336         /* initialize other endpoints */
1337         for (i = 2; i < u3d->max_eps * 2; i++) {
1338                 ep = &u3d->eps[i];
1339                 if (i & 1) {
1340                         snprintf(name, sizeof(name), "ep%din", i >> 1);
1341                         ep->direction = MV_U3D_EP_DIR_IN;
1342                 } else {
1343                         snprintf(name, sizeof(name), "ep%dout", i >> 1);
1344                         ep->direction = MV_U3D_EP_DIR_OUT;
1345                 }
1346                 ep->u3d = u3d;
1347                 strncpy(ep->name, name, sizeof(ep->name));
1348                 ep->ep.name = ep->name;
1349
1350                 ep->ep.ops = &mv_u3d_ep_ops;
1351                 usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
1352                 ep->ep_num = i / 2;
1353
1354                 INIT_LIST_HEAD(&ep->queue);
1355                 list_add_tail(&ep->ep.ep_list, &u3d->gadget.ep_list);
1356
1357                 INIT_LIST_HEAD(&ep->req_list);
1358                 spin_lock_init(&ep->req_lock);
1359                 ep->ep_context = &u3d->ep_context[i];
1360         }
1361
1362         return 0;
1363 }
1364
1365 /* delete all endpoint requests, called with spinlock held */
1366 static void mv_u3d_nuke(struct mv_u3d_ep *ep, int status)
1367 {
1368         /* endpoint fifo flush */
1369         mv_u3d_ep_fifo_flush(&ep->ep);
1370
1371         while (!list_empty(&ep->queue)) {
1372                 struct mv_u3d_req *req = NULL;
1373                 req = list_entry(ep->queue.next, struct mv_u3d_req, queue);
1374                 mv_u3d_done(ep, req, status);
1375         }
1376 }
1377
1378 /* stop all USB activities */
1379 static
1380 void mv_u3d_stop_activity(struct mv_u3d *u3d, struct usb_gadget_driver *driver)
1381 {
1382         struct mv_u3d_ep        *ep;
1383
1384         mv_u3d_nuke(&u3d->eps[1], -ESHUTDOWN);
1385
1386         list_for_each_entry(ep, &u3d->gadget.ep_list, ep.ep_list) {
1387                 mv_u3d_nuke(ep, -ESHUTDOWN);
1388         }
1389
1390         /* report disconnect; the driver is already quiesced */
1391         if (driver) {
1392                 spin_unlock(&u3d->lock);
1393                 driver->disconnect(&u3d->gadget);
1394                 spin_lock(&u3d->lock);
1395         }
1396 }
1397
1398 static void mv_u3d_irq_process_error(struct mv_u3d *u3d)
1399 {
1400         /* Increment the error count */
1401         u3d->errors++;
1402         dev_err(u3d->dev, "%s\n", __func__);
1403 }
1404
1405 static void mv_u3d_irq_process_link_change(struct mv_u3d *u3d)
1406 {
1407         u32 linkchange;
1408
1409         linkchange = ioread32(&u3d->vuc_regs->linkchange);
1410         iowrite32(linkchange, &u3d->vuc_regs->linkchange);
1411
1412         dev_dbg(u3d->dev, "linkchange: 0x%x\n", linkchange);
1413
1414         if (linkchange & MV_U3D_LINK_CHANGE_LINK_UP) {
1415                 dev_dbg(u3d->dev, "link up: ltssm state: 0x%x\n",
1416                         ioread32(&u3d->vuc_regs->ltssmstate));
1417
1418                 u3d->usb_state = USB_STATE_DEFAULT;
1419                 u3d->ep0_dir = MV_U3D_EP_DIR_OUT;
1420                 u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP;
1421
1422                 /* set speed */
1423                 u3d->gadget.speed = USB_SPEED_SUPER;
1424         }
1425
1426         if (linkchange & MV_U3D_LINK_CHANGE_SUSPEND) {
1427                 dev_dbg(u3d->dev, "link suspend\n");
1428                 u3d->resume_state = u3d->usb_state;
1429                 u3d->usb_state = USB_STATE_SUSPENDED;
1430         }
1431
1432         if (linkchange & MV_U3D_LINK_CHANGE_RESUME) {
1433                 dev_dbg(u3d->dev, "link resume\n");
1434                 u3d->usb_state = u3d->resume_state;
1435                 u3d->resume_state = 0;
1436         }
1437
1438         if (linkchange & MV_U3D_LINK_CHANGE_WRESET) {
1439                 dev_dbg(u3d->dev, "warm reset\n");
1440                 u3d->usb_state = USB_STATE_POWERED;
1441         }
1442
1443         if (linkchange & MV_U3D_LINK_CHANGE_HRESET) {
1444                 dev_dbg(u3d->dev, "hot reset\n");
1445                 u3d->usb_state = USB_STATE_DEFAULT;
1446         }
1447
1448         if (linkchange & MV_U3D_LINK_CHANGE_INACT)
1449                 dev_dbg(u3d->dev, "inactive\n");
1450
1451         if (linkchange & MV_U3D_LINK_CHANGE_DISABLE_AFTER_U0)
1452                 dev_dbg(u3d->dev, "ss.disabled\n");
1453
1454         if (linkchange & MV_U3D_LINK_CHANGE_VBUS_INVALID) {
1455                 dev_dbg(u3d->dev, "vbus invalid\n");
1456                 u3d->usb_state = USB_STATE_ATTACHED;
1457                 u3d->vbus_valid_detect = 1;
1458                 /* if external vbus detect is not supported,
1459                  * we handle it here.
1460                  */
1461                 if (!u3d->vbus) {
1462                         spin_unlock(&u3d->lock);
1463                         mv_u3d_vbus_session(&u3d->gadget, 0);
1464                         spin_lock(&u3d->lock);
1465                 }
1466         }
1467 }
1468
1469 static void mv_u3d_ch9setaddress(struct mv_u3d *u3d,
1470                                 struct usb_ctrlrequest *setup)
1471 {
1472         u32 tmp;
1473
1474         if (u3d->usb_state != USB_STATE_DEFAULT) {
1475                 dev_err(u3d->dev,
1476                         "%s, cannot setaddr in this state (%d)\n",
1477                         __func__, u3d->usb_state);
1478                 goto err;
1479         }
1480
1481         u3d->dev_addr = (u8)setup->wValue;
1482
1483         dev_dbg(u3d->dev, "%s: 0x%x\n", __func__, u3d->dev_addr);
1484
1485         if (u3d->dev_addr > 127) {
1486                 dev_err(u3d->dev,
1487                         "%s, u3d address is wrong (out of range)\n", __func__);
1488                 u3d->dev_addr = 0;
1489                 goto err;
1490         }
1491
1492         /* update usb state */
1493         u3d->usb_state = USB_STATE_ADDRESS;
1494
1495         /* set the new address */
1496         tmp = ioread32(&u3d->vuc_regs->devaddrtiebrkr);
1497         tmp &= ~0x7F;
1498         tmp |= (u32)u3d->dev_addr;
1499         iowrite32(tmp, &u3d->vuc_regs->devaddrtiebrkr);
1500
1501         return;
1502 err:
1503         mv_u3d_ep0_stall(u3d);
1504 }
1505
1506 static int mv_u3d_is_set_configuration(struct usb_ctrlrequest *setup)
1507 {
1508         if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
1509                 if (setup->bRequest == USB_REQ_SET_CONFIGURATION)
1510                         return 1;
1511
1512         return 0;
1513 }
1514
1515 static void mv_u3d_handle_setup_packet(struct mv_u3d *u3d, u8 ep_num,
1516         struct usb_ctrlrequest *setup)
1517         __releases(&u3c->lock)
1518         __acquires(&u3c->lock)
1519 {
1520         bool delegate = false;
1521
1522         mv_u3d_nuke(&u3d->eps[ep_num * 2 + MV_U3D_EP_DIR_IN], -ESHUTDOWN);
1523
1524         dev_dbg(u3d->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1525                         setup->bRequestType, setup->bRequest,
1526                         setup->wValue, setup->wIndex, setup->wLength);
1527
1528         /* We process some stardard setup requests here */
1529         if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1530                 switch (setup->bRequest) {
1531                 case USB_REQ_GET_STATUS:
1532                         delegate = true;
1533                         break;
1534
1535                 case USB_REQ_SET_ADDRESS:
1536                         mv_u3d_ch9setaddress(u3d, setup);
1537                         break;
1538
1539                 case USB_REQ_CLEAR_FEATURE:
1540                         delegate = true;
1541                         break;
1542
1543                 case USB_REQ_SET_FEATURE:
1544                         delegate = true;
1545                         break;
1546
1547                 default:
1548                         delegate = true;
1549                 }
1550         } else
1551                 delegate = true;
1552
1553         /* delegate USB standard requests to the gadget driver */
1554         if (delegate == true) {
1555                 /* USB requests handled by gadget */
1556                 if (setup->wLength) {
1557                         /* DATA phase from gadget, STATUS phase from u3d */
1558                         u3d->ep0_dir = (setup->bRequestType & USB_DIR_IN)
1559                                         ? MV_U3D_EP_DIR_IN : MV_U3D_EP_DIR_OUT;
1560                         spin_unlock(&u3d->lock);
1561                         if (u3d->driver->setup(&u3d->gadget,
1562                                 &u3d->local_setup_buff) < 0) {
1563                                 dev_err(u3d->dev, "setup error!\n");
1564                                 mv_u3d_ep0_stall(u3d);
1565                         }
1566                         spin_lock(&u3d->lock);
1567                 } else {
1568                         /* no DATA phase, STATUS phase from gadget */
1569                         u3d->ep0_dir = MV_U3D_EP_DIR_IN;
1570                         u3d->ep0_state = MV_U3D_STATUS_STAGE;
1571                         spin_unlock(&u3d->lock);
1572                         if (u3d->driver->setup(&u3d->gadget,
1573                                 &u3d->local_setup_buff) < 0)
1574                                 mv_u3d_ep0_stall(u3d);
1575                         spin_lock(&u3d->lock);
1576                 }
1577
1578                 if (mv_u3d_is_set_configuration(setup)) {
1579                         dev_dbg(u3d->dev, "u3d configured\n");
1580                         u3d->usb_state = USB_STATE_CONFIGURED;
1581                 }
1582         }
1583 }
1584
1585 static void mv_u3d_get_setup_data(struct mv_u3d *u3d, u8 ep_num, u8 *buffer_ptr)
1586 {
1587         struct mv_u3d_ep_context *epcontext;
1588
1589         epcontext = &u3d->ep_context[ep_num * 2 + MV_U3D_EP_DIR_IN];
1590
1591         /* Copy the setup packet to local buffer */
1592         memcpy(buffer_ptr, (u8 *) &epcontext->setup_buffer, 8);
1593 }
1594
1595 static void mv_u3d_irq_process_setup(struct mv_u3d *u3d)
1596 {
1597         u32 tmp, i;
1598         /* Process all Setup packet received interrupts */
1599         tmp = ioread32(&u3d->vuc_regs->setuplock);
1600         if (tmp) {
1601                 for (i = 0; i < u3d->max_eps; i++) {
1602                         if (tmp & (1 << i)) {
1603                                 mv_u3d_get_setup_data(u3d, i,
1604                                         (u8 *)(&u3d->local_setup_buff));
1605                                 mv_u3d_handle_setup_packet(u3d, i,
1606                                         &u3d->local_setup_buff);
1607                         }
1608                 }
1609         }
1610
1611         iowrite32(tmp, &u3d->vuc_regs->setuplock);
1612 }
1613
1614 static void mv_u3d_irq_process_tr_complete(struct mv_u3d *u3d)
1615 {
1616         u32 tmp, bit_pos;
1617         int i, ep_num = 0, direction = 0;
1618         struct mv_u3d_ep        *curr_ep;
1619         struct mv_u3d_req *curr_req, *temp_req;
1620         int status;
1621
1622         tmp = ioread32(&u3d->vuc_regs->endcomplete);
1623
1624         dev_dbg(u3d->dev, "tr_complete: ep: 0x%x\n", tmp);
1625         if (!tmp)
1626                 return;
1627         iowrite32(tmp, &u3d->vuc_regs->endcomplete);
1628
1629         for (i = 0; i < u3d->max_eps * 2; i++) {
1630                 ep_num = i >> 1;
1631                 direction = i % 2;
1632
1633                 bit_pos = 1 << (ep_num + 16 * direction);
1634
1635                 if (!(bit_pos & tmp))
1636                         continue;
1637
1638                 if (i == 0)
1639                         curr_ep = &u3d->eps[1];
1640                 else
1641                         curr_ep = &u3d->eps[i];
1642
1643                 /* remove req out of ep request list after completion */
1644                 dev_dbg(u3d->dev, "tr comp: check req_list\n");
1645                 spin_lock(&curr_ep->req_lock);
1646                 if (!list_empty(&curr_ep->req_list)) {
1647                         struct mv_u3d_req *req;
1648                         req = list_entry(curr_ep->req_list.next,
1649                                                 struct mv_u3d_req, list);
1650                         list_del_init(&req->list);
1651                         curr_ep->processing = 0;
1652                 }
1653                 spin_unlock(&curr_ep->req_lock);
1654
1655                 /* process the req queue until an uncomplete request */
1656                 list_for_each_entry_safe(curr_req, temp_req,
1657                         &curr_ep->queue, queue) {
1658                         status = mv_u3d_process_ep_req(u3d, i, curr_req);
1659                         if (status)
1660                                 break;
1661                         /* write back status to req */
1662                         curr_req->req.status = status;
1663
1664                         /* ep0 request completion */
1665                         if (ep_num == 0) {
1666                                 mv_u3d_done(curr_ep, curr_req, 0);
1667                                 break;
1668                         } else {
1669                                 mv_u3d_done(curr_ep, curr_req, status);
1670                         }
1671                 }
1672
1673                 dev_dbg(u3d->dev, "call mv_u3d_start_queue from ep complete\n");
1674                 mv_u3d_start_queue(curr_ep);
1675         }
1676 }
1677
1678 static irqreturn_t mv_u3d_irq(int irq, void *dev)
1679 {
1680         struct mv_u3d *u3d = (struct mv_u3d *)dev;
1681         u32 status, intr;
1682         u32 bridgesetting;
1683         u32 trbunderrun;
1684
1685         spin_lock(&u3d->lock);
1686
1687         status = ioread32(&u3d->vuc_regs->intrcause);
1688         intr = ioread32(&u3d->vuc_regs->intrenable);
1689         status &= intr;
1690
1691         if (status == 0) {
1692                 spin_unlock(&u3d->lock);
1693                 dev_err(u3d->dev, "irq error!\n");
1694                 return IRQ_NONE;
1695         }
1696
1697         if (status & MV_U3D_USBINT_VBUS_VALID) {
1698                 bridgesetting = ioread32(&u3d->vuc_regs->bridgesetting);
1699                 if (bridgesetting & MV_U3D_BRIDGE_SETTING_VBUS_VALID) {
1700                         /* write vbus valid bit of bridge setting to clear */
1701                         bridgesetting = MV_U3D_BRIDGE_SETTING_VBUS_VALID;
1702                         iowrite32(bridgesetting, &u3d->vuc_regs->bridgesetting);
1703                         dev_dbg(u3d->dev, "vbus valid\n");
1704
1705                         u3d->usb_state = USB_STATE_POWERED;
1706                         u3d->vbus_valid_detect = 0;
1707                         /* if external vbus detect is not supported,
1708                          * we handle it here.
1709                          */
1710                         if (!u3d->vbus) {
1711                                 spin_unlock(&u3d->lock);
1712                                 mv_u3d_vbus_session(&u3d->gadget, 1);
1713                                 spin_lock(&u3d->lock);
1714                         }
1715                 } else
1716                         dev_err(u3d->dev, "vbus bit is not set\n");
1717         }
1718
1719         /* RX data is already in the 16KB FIFO.*/
1720         if (status & MV_U3D_USBINT_UNDER_RUN) {
1721                 trbunderrun = ioread32(&u3d->vuc_regs->trbunderrun);
1722                 dev_err(u3d->dev, "under run, ep%d\n", trbunderrun);
1723                 iowrite32(trbunderrun, &u3d->vuc_regs->trbunderrun);
1724                 mv_u3d_irq_process_error(u3d);
1725         }
1726
1727         if (status & (MV_U3D_USBINT_RXDESC_ERR | MV_U3D_USBINT_TXDESC_ERR)) {
1728                 /* write one to clear */
1729                 iowrite32(status & (MV_U3D_USBINT_RXDESC_ERR
1730                         | MV_U3D_USBINT_TXDESC_ERR),
1731                         &u3d->vuc_regs->intrcause);
1732                 dev_err(u3d->dev, "desc err 0x%x\n", status);
1733                 mv_u3d_irq_process_error(u3d);
1734         }
1735
1736         if (status & MV_U3D_USBINT_LINK_CHG)
1737                 mv_u3d_irq_process_link_change(u3d);
1738
1739         if (status & MV_U3D_USBINT_TX_COMPLETE)
1740                 mv_u3d_irq_process_tr_complete(u3d);
1741
1742         if (status & MV_U3D_USBINT_RX_COMPLETE)
1743                 mv_u3d_irq_process_tr_complete(u3d);
1744
1745         if (status & MV_U3D_USBINT_SETUP)
1746                 mv_u3d_irq_process_setup(u3d);
1747
1748         spin_unlock(&u3d->lock);
1749         return IRQ_HANDLED;
1750 }
1751
1752 static int mv_u3d_remove(struct platform_device *dev)
1753 {
1754         struct mv_u3d *u3d = platform_get_drvdata(dev);
1755
1756         BUG_ON(u3d == NULL);
1757
1758         usb_del_gadget_udc(&u3d->gadget);
1759
1760         /* free memory allocated in probe */
1761         if (u3d->trb_pool)
1762                 dma_pool_destroy(u3d->trb_pool);
1763
1764         if (u3d->ep_context)
1765                 dma_free_coherent(&dev->dev, u3d->ep_context_size,
1766                         u3d->ep_context, u3d->ep_context_dma);
1767
1768         kfree(u3d->eps);
1769
1770         if (u3d->irq)
1771                 free_irq(u3d->irq, u3d);
1772
1773         if (u3d->cap_regs)
1774                 iounmap(u3d->cap_regs);
1775         u3d->cap_regs = NULL;
1776
1777         kfree(u3d->status_req);
1778
1779         clk_put(u3d->clk);
1780
1781         kfree(u3d);
1782
1783         return 0;
1784 }
1785
1786 static int mv_u3d_probe(struct platform_device *dev)
1787 {
1788         struct mv_u3d *u3d = NULL;
1789         struct mv_usb_platform_data *pdata = dev_get_platdata(&dev->dev);
1790         int retval = 0;
1791         struct resource *r;
1792         size_t size;
1793
1794         if (!dev_get_platdata(&dev->dev)) {
1795                 dev_err(&dev->dev, "missing platform_data\n");
1796                 retval = -ENODEV;
1797                 goto err_pdata;
1798         }
1799
1800         u3d = kzalloc(sizeof(*u3d), GFP_KERNEL);
1801         if (!u3d) {
1802                 retval = -ENOMEM;
1803                 goto err_alloc_private;
1804         }
1805
1806         spin_lock_init(&u3d->lock);
1807
1808         platform_set_drvdata(dev, u3d);
1809
1810         u3d->dev = &dev->dev;
1811         u3d->vbus = pdata->vbus;
1812
1813         u3d->clk = clk_get(&dev->dev, NULL);
1814         if (IS_ERR(u3d->clk)) {
1815                 retval = PTR_ERR(u3d->clk);
1816                 goto err_get_clk;
1817         }
1818
1819         r = platform_get_resource_byname(dev, IORESOURCE_MEM, "capregs");
1820         if (!r) {
1821                 dev_err(&dev->dev, "no I/O memory resource defined\n");
1822                 retval = -ENODEV;
1823                 goto err_get_cap_regs;
1824         }
1825
1826         u3d->cap_regs = (struct mv_u3d_cap_regs __iomem *)
1827                 ioremap(r->start, resource_size(r));
1828         if (!u3d->cap_regs) {
1829                 dev_err(&dev->dev, "failed to map I/O memory\n");
1830                 retval = -EBUSY;
1831                 goto err_map_cap_regs;
1832         } else {
1833                 dev_dbg(&dev->dev, "cap_regs address: 0x%lx/0x%lx\n",
1834                         (unsigned long) r->start,
1835                         (unsigned long) u3d->cap_regs);
1836         }
1837
1838         /* we will access controller register, so enable the u3d controller */
1839         clk_enable(u3d->clk);
1840
1841         if (pdata->phy_init) {
1842                 retval = pdata->phy_init(u3d->phy_regs);
1843                 if (retval) {
1844                         dev_err(&dev->dev, "init phy error %d\n", retval);
1845                         goto err_u3d_enable;
1846                 }
1847         }
1848
1849         u3d->op_regs = (struct mv_u3d_op_regs __iomem *)(u3d->cap_regs
1850                 + MV_U3D_USB3_OP_REGS_OFFSET);
1851
1852         u3d->vuc_regs = (struct mv_u3d_vuc_regs __iomem *)(u3d->cap_regs
1853                 + ioread32(&u3d->cap_regs->vuoff));
1854
1855         u3d->max_eps = 16;
1856
1857         /*
1858          * some platform will use usb to download image, it may not disconnect
1859          * usb gadget before loading kernel. So first stop u3d here.
1860          */
1861         mv_u3d_controller_stop(u3d);
1862         iowrite32(0xFFFFFFFF, &u3d->vuc_regs->intrcause);
1863
1864         if (pdata->phy_deinit)
1865                 pdata->phy_deinit(u3d->phy_regs);
1866         clk_disable(u3d->clk);
1867
1868         size = u3d->max_eps * sizeof(struct mv_u3d_ep_context) * 2;
1869         size = (size + MV_U3D_EP_CONTEXT_ALIGNMENT - 1)
1870                 & ~(MV_U3D_EP_CONTEXT_ALIGNMENT - 1);
1871         u3d->ep_context = dma_alloc_coherent(&dev->dev, size,
1872                                         &u3d->ep_context_dma, GFP_KERNEL);
1873         if (!u3d->ep_context) {
1874                 dev_err(&dev->dev, "allocate ep context memory failed\n");
1875                 retval = -ENOMEM;
1876                 goto err_alloc_ep_context;
1877         }
1878         u3d->ep_context_size = size;
1879
1880         /* create TRB dma_pool resource */
1881         u3d->trb_pool = dma_pool_create("u3d_trb",
1882                         &dev->dev,
1883                         sizeof(struct mv_u3d_trb_hw),
1884                         MV_U3D_TRB_ALIGNMENT,
1885                         MV_U3D_DMA_BOUNDARY);
1886
1887         if (!u3d->trb_pool) {
1888                 retval = -ENOMEM;
1889                 goto err_alloc_trb_pool;
1890         }
1891
1892         size = u3d->max_eps * sizeof(struct mv_u3d_ep) * 2;
1893         u3d->eps = kzalloc(size, GFP_KERNEL);
1894         if (!u3d->eps) {
1895                 retval = -ENOMEM;
1896                 goto err_alloc_eps;
1897         }
1898
1899         /* initialize ep0 status request structure */
1900         u3d->status_req = kzalloc(sizeof(struct mv_u3d_req) + 8, GFP_KERNEL);
1901         if (!u3d->status_req) {
1902                 retval = -ENOMEM;
1903                 goto err_alloc_status_req;
1904         }
1905         INIT_LIST_HEAD(&u3d->status_req->queue);
1906
1907         /* allocate a small amount of memory to get valid address */
1908         u3d->status_req->req.buf = (char *)u3d->status_req
1909                                         + sizeof(struct mv_u3d_req);
1910         u3d->status_req->req.dma = virt_to_phys(u3d->status_req->req.buf);
1911
1912         u3d->resume_state = USB_STATE_NOTATTACHED;
1913         u3d->usb_state = USB_STATE_ATTACHED;
1914         u3d->ep0_dir = MV_U3D_EP_DIR_OUT;
1915         u3d->remote_wakeup = 0;
1916
1917         r = platform_get_resource(dev, IORESOURCE_IRQ, 0);
1918         if (!r) {
1919                 dev_err(&dev->dev, "no IRQ resource defined\n");
1920                 retval = -ENODEV;
1921                 goto err_get_irq;
1922         }
1923         u3d->irq = r->start;
1924         if (request_irq(u3d->irq, mv_u3d_irq,
1925                 IRQF_SHARED, driver_name, u3d)) {
1926                 u3d->irq = 0;
1927                 dev_err(&dev->dev, "Request irq %d for u3d failed\n",
1928                         u3d->irq);
1929                 retval = -ENODEV;
1930                 goto err_request_irq;
1931         }
1932
1933         /* initialize gadget structure */
1934         u3d->gadget.ops = &mv_u3d_ops;  /* usb_gadget_ops */
1935         u3d->gadget.ep0 = &u3d->eps[1].ep;      /* gadget ep0 */
1936         INIT_LIST_HEAD(&u3d->gadget.ep_list);   /* ep_list */
1937         u3d->gadget.speed = USB_SPEED_UNKNOWN;  /* speed */
1938
1939         /* the "gadget" abstracts/virtualizes the controller */
1940         u3d->gadget.name = driver_name;         /* gadget name */
1941
1942         mv_u3d_eps_init(u3d);
1943
1944         /* external vbus detection */
1945         if (u3d->vbus) {
1946                 u3d->clock_gating = 1;
1947                 dev_err(&dev->dev, "external vbus detection\n");
1948         }
1949
1950         if (!u3d->clock_gating)
1951                 u3d->vbus_active = 1;
1952
1953         /* enable usb3 controller vbus detection */
1954         u3d->vbus_valid_detect = 1;
1955
1956         retval = usb_add_gadget_udc(&dev->dev, &u3d->gadget);
1957         if (retval)
1958                 goto err_unregister;
1959
1960         dev_dbg(&dev->dev, "successful probe usb3 device %s clock gating.\n",
1961                 u3d->clock_gating ? "with" : "without");
1962
1963         return 0;
1964
1965 err_unregister:
1966         free_irq(u3d->irq, u3d);
1967 err_request_irq:
1968 err_get_irq:
1969         kfree(u3d->status_req);
1970 err_alloc_status_req:
1971         kfree(u3d->eps);
1972 err_alloc_eps:
1973         dma_pool_destroy(u3d->trb_pool);
1974 err_alloc_trb_pool:
1975         dma_free_coherent(&dev->dev, u3d->ep_context_size,
1976                 u3d->ep_context, u3d->ep_context_dma);
1977 err_alloc_ep_context:
1978         if (pdata->phy_deinit)
1979                 pdata->phy_deinit(u3d->phy_regs);
1980         clk_disable(u3d->clk);
1981 err_u3d_enable:
1982         iounmap(u3d->cap_regs);
1983 err_map_cap_regs:
1984 err_get_cap_regs:
1985 err_get_clk:
1986         clk_put(u3d->clk);
1987         kfree(u3d);
1988 err_alloc_private:
1989 err_pdata:
1990         return retval;
1991 }
1992
1993 #ifdef CONFIG_PM_SLEEP
1994 static int mv_u3d_suspend(struct device *dev)
1995 {
1996         struct mv_u3d *u3d = dev_get_drvdata(dev);
1997
1998         /*
1999          * only cable is unplugged, usb can suspend.
2000          * So do not care about clock_gating == 1, it is handled by
2001          * vbus session.
2002          */
2003         if (!u3d->clock_gating) {
2004                 mv_u3d_controller_stop(u3d);
2005
2006                 spin_lock_irq(&u3d->lock);
2007                 /* stop all usb activities */
2008                 mv_u3d_stop_activity(u3d, u3d->driver);
2009                 spin_unlock_irq(&u3d->lock);
2010
2011                 mv_u3d_disable(u3d);
2012         }
2013
2014         return 0;
2015 }
2016
2017 static int mv_u3d_resume(struct device *dev)
2018 {
2019         struct mv_u3d *u3d = dev_get_drvdata(dev);
2020         int retval;
2021
2022         if (!u3d->clock_gating) {
2023                 retval = mv_u3d_enable(u3d);
2024                 if (retval)
2025                         return retval;
2026
2027                 if (u3d->driver && u3d->softconnect) {
2028                         mv_u3d_controller_reset(u3d);
2029                         mv_u3d_ep0_reset(u3d);
2030                         mv_u3d_controller_start(u3d);
2031                 }
2032         }
2033
2034         return 0;
2035 }
2036 #endif
2037
2038 static SIMPLE_DEV_PM_OPS(mv_u3d_pm_ops, mv_u3d_suspend, mv_u3d_resume);
2039
2040 static void mv_u3d_shutdown(struct platform_device *dev)
2041 {
2042         struct mv_u3d *u3d = platform_get_drvdata(dev);
2043         u32 tmp;
2044
2045         tmp = ioread32(&u3d->op_regs->usbcmd);
2046         tmp &= ~MV_U3D_CMD_RUN_STOP;
2047         iowrite32(tmp, &u3d->op_regs->usbcmd);
2048 }
2049
2050 static struct platform_driver mv_u3d_driver = {
2051         .probe          = mv_u3d_probe,
2052         .remove         = mv_u3d_remove,
2053         .shutdown       = mv_u3d_shutdown,
2054         .driver         = {
2055                 .name   = "mv-u3d",
2056                 .pm     = &mv_u3d_pm_ops,
2057         },
2058 };
2059
2060 module_platform_driver(mv_u3d_driver);
2061 MODULE_ALIAS("platform:mv-u3d");
2062 MODULE_DESCRIPTION(DRIVER_DESC);
2063 MODULE_AUTHOR("Yu Xu <yuxu@marvell.com>");
2064 MODULE_LICENSE("GPL");