drivers/usb/gadget/mv_udc.c

   1 /*
   2  * Copyright 2011, Marvell Semiconductor Inc.
   3  * Lei Wen <leiwen@marvell.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Back ported to the 8xx platform (from the 8260 platform) by
   8  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <config.h>
  14 #include <net.h>
  15 #include <malloc.h>
  16 #include <asm/io.h>
  17 #include <linux/types.h>
  18 #include <usb/mv_udc.h>
  19
  20 #if CONFIG_USB_MAX_CONTROLLER_COUNT > 1
  21 #error This driver only supports one single controller.
  22 #endif
  23
  24 /*
  25  * Check if the system has too long cachelines. If the cachelines are
  26  * longer then 128b, the driver will not be able flush/invalidate data
  27  * cache over separate QH entries. We use 128b because one QH entry is
  28  * 64b long and there are always two QH list entries for each endpoint.
  29  */
  30 #if ARCH_DMA_MINALIGN > 128
  31 #error This driver can not work on systems with caches longer than 128b
  32 #endif
  33
  34 #ifndef DEBUG
  35 #define DBG(x...) do {} while (0)
  36 #else
  37 #define DBG(x...) printf(x)
  38 static const char *reqname(unsigned r)
  39 {
  40         switch (r) {
  41         case USB_REQ_GET_STATUS: return "GET_STATUS";
  42         case USB_REQ_CLEAR_FEATURE: return "CLEAR_FEATURE";
  43         case USB_REQ_SET_FEATURE: return "SET_FEATURE";
  44         case USB_REQ_SET_ADDRESS: return "SET_ADDRESS";
  45         case USB_REQ_GET_DESCRIPTOR: return "GET_DESCRIPTOR";
  46         case USB_REQ_SET_DESCRIPTOR: return "SET_DESCRIPTOR";
  47         case USB_REQ_GET_CONFIGURATION: return "GET_CONFIGURATION";
  48         case USB_REQ_SET_CONFIGURATION: return "SET_CONFIGURATION";
  49         case USB_REQ_GET_INTERFACE: return "GET_INTERFACE";
  50         case USB_REQ_SET_INTERFACE: return "SET_INTERFACE";
  51         default: return "*UNKNOWN*";
  52         }
  53 }
  54 #endif
  55
  56 static struct usb_endpoint_descriptor ep0_out_desc = {
  57         .bLength = sizeof(struct usb_endpoint_descriptor),
  58         .bDescriptorType = USB_DT_ENDPOINT,
  59         .bEndpointAddress = 0,
  60         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  61 };
  62
  63 static struct usb_endpoint_descriptor ep0_in_desc = {
  64         .bLength = sizeof(struct usb_endpoint_descriptor),
  65         .bDescriptorType = USB_DT_ENDPOINT,
  66         .bEndpointAddress = USB_DIR_IN,
  67         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  68 };
  69
  70 static int mv_pullup(struct usb_gadget *gadget, int is_on);
  71 static int mv_ep_enable(struct usb_ep *ep,
  72                 const struct usb_endpoint_descriptor *desc);
  73 static int mv_ep_disable(struct usb_ep *ep);
  74 static int mv_ep_queue(struct usb_ep *ep,
  75                 struct usb_request *req, gfp_t gfp_flags);
  76 static struct usb_request *
  77 mv_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags);
  78 static void mv_ep_free_request(struct usb_ep *ep, struct usb_request *_req);
  79
  80 static struct usb_gadget_ops mv_udc_ops = {
  81         .pullup = mv_pullup,
  82 };
  83
  84 static struct usb_ep_ops mv_ep_ops = {
  85         .enable         = mv_ep_enable,
  86         .disable        = mv_ep_disable,
  87         .queue          = mv_ep_queue,
  88         .alloc_request  = mv_ep_alloc_request,
  89         .free_request   = mv_ep_free_request,
  90 };
  91
  92 /* Init values for USB endpoints. */
  93 static const struct usb_ep mv_ep_init[2] = {
  94         [0] = { /* EP 0 */
  95                 .maxpacket      = 64,
  96                 .name           = "ep0",
  97                 .ops            = &mv_ep_ops,
  98         },
  99         [1] = { /* EP 1..n */
 100                 .maxpacket      = 512,
 101                 .name           = "ep-",
 102                 .ops            = &mv_ep_ops,
 103         },
 104 };
 105
 106 static struct mv_drv controller = {
 107         .gadget = {
 108                 .name   = "mv_udc",
 109                 .ops    = &mv_udc_ops,
 110         },
 111 };
 112
 113 /**
 114  * mv_get_qh() - return queue head for endpoint
 115  * @ep_num:     Endpoint number
 116  * @dir_in:     Direction of the endpoint (IN = 1, OUT = 0)
 117  *
 118  * This function returns the QH associated with particular endpoint
 119  * and it's direction.
 120  */
 121 static struct ept_queue_head *mv_get_qh(int ep_num, int dir_in)
 122 {
 123         return &controller.epts[(ep_num * 2) + dir_in];
 124 }
 125
 126 /**
 127  * mv_get_qtd() - return queue item for endpoint
 128  * @ep_num:     Endpoint number
 129  * @dir_in:     Direction of the endpoint (IN = 1, OUT = 0)
 130  *
 131  * This function returns the QH associated with particular endpoint
 132  * and it's direction.
 133  */
 134 static struct ept_queue_item *mv_get_qtd(int ep_num, int dir_in)
 135 {
 136         return controller.items[(ep_num * 2) + dir_in];
 137 }
 138
 139 /**
 140  * mv_flush_qh - flush cache over queue head
 141  * @ep_num:     Endpoint number
 142  *
 143  * This function flushes cache over QH for particular endpoint.
 144  */
 145 static void mv_flush_qh(int ep_num)
 146 {
 147         struct ept_queue_head *head = mv_get_qh(ep_num, 0);
 148         const uint32_t start = (uint32_t)head;
 149         const uint32_t end = start + 2 * sizeof(*head);
 150
 151         flush_dcache_range(start, end);
 152 }
 153
 154 /**
 155  * mv_invalidate_qh - invalidate cache over queue head
 156  * @ep_num:     Endpoint number
 157  *
 158  * This function invalidates cache over QH for particular endpoint.
 159  */
 160 static void mv_invalidate_qh(int ep_num)
 161 {
 162         struct ept_queue_head *head = mv_get_qh(ep_num, 0);
 163         uint32_t start = (uint32_t)head;
 164         uint32_t end = start + 2 * sizeof(*head);
 165
 166         invalidate_dcache_range(start, end);
 167 }
 168
 169 /**
 170  * mv_flush_qtd - flush cache over queue item
 171  * @ep_num:     Endpoint number
 172  *
 173  * This function flushes cache over qTD pair for particular endpoint.
 174  */
 175 static void mv_flush_qtd(int ep_num)
 176 {
 177         struct ept_queue_item *item = mv_get_qtd(ep_num, 0);
 178         const uint32_t start = (uint32_t)item;
 179         const uint32_t end_raw = start + 2 * sizeof(*item);
 180         const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
 181
 182         flush_dcache_range(start, end);
 183 }
 184
 185 /**
 186  * mv_invalidate_qtd - invalidate cache over queue item
 187  * @ep_num:     Endpoint number
 188  *
 189  * This function invalidates cache over qTD pair for particular endpoint.
 190  */
 191 static void mv_invalidate_qtd(int ep_num)
 192 {
 193         struct ept_queue_item *item = mv_get_qtd(ep_num, 0);
 194         const uint32_t start = (uint32_t)item;
 195         const uint32_t end_raw = start + 2 * sizeof(*item);
 196         const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
 197
 198         invalidate_dcache_range(start, end);
 199 }
 200
 201 static struct usb_request *
 202 mv_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
 203 {
 204         struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
 205         return &mv_ep->req;
 206 }
 207
 208 static void mv_ep_free_request(struct usb_ep *ep, struct usb_request *_req)
 209 {
 210         return;
 211 }
 212
 213 static void ep_enable(int num, int in)
 214 {
 215         struct ept_queue_head *head;
 216         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 217         unsigned n;
 218         head = mv_get_qh(num, in);
 219
 220         n = readl(&udc->epctrl[num]);
 221         if (in)
 222                 n |= (CTRL_TXE | CTRL_TXR | CTRL_TXT_BULK);
 223         else
 224                 n |= (CTRL_RXE | CTRL_RXR | CTRL_RXT_BULK);
 225
 226         if (num != 0) {
 227                 head->config = CONFIG_MAX_PKT(EP_MAX_PACKET_SIZE) | CONFIG_ZLT;
 228                 mv_flush_qh(num);
 229         }
 230         writel(n, &udc->epctrl[num]);
 231 }
 232
 233 static int mv_ep_enable(struct usb_ep *ep,
 234                 const struct usb_endpoint_descriptor *desc)
 235 {
 236         struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
 237         int num, in;
 238         num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 239         in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
 240         ep_enable(num, in);
 241         mv_ep->desc = desc;
 242         return 0;
 243 }
 244
 245 static int mv_ep_disable(struct usb_ep *ep)
 246 {
 247         return 0;
 248 }
 249
 250 static int mv_bounce(struct mv_ep *ep)
 251 {
 252         uint32_t addr = (uint32_t)ep->req.buf;
 253         uint32_t ba;
 254
 255         /* Input buffer address is not aligned. */
 256         if (addr & (ARCH_DMA_MINALIGN - 1))
 257                 goto align;
 258
 259         /* Input buffer length is not aligned. */
 260         if (ep->req.length & (ARCH_DMA_MINALIGN - 1))
 261                 goto align;
 262
 263         /* The buffer is well aligned, only flush cache. */
 264         ep->b_len = ep->req.length;
 265         ep->b_buf = ep->req.buf;
 266         goto flush;
 267
 268 align:
 269         /* Use internal buffer for small payloads. */
 270         if (ep->req.length <= 64) {
 271                 ep->b_len = 64;
 272                 ep->b_buf = ep->b_fast;
 273         } else {
 274                 ep->b_len = roundup(ep->req.length, ARCH_DMA_MINALIGN);
 275                 ep->b_buf = memalign(ARCH_DMA_MINALIGN, ep->b_len);
 276                 if (!ep->b_buf)
 277                         return -ENOMEM;
 278         }
 279
 280         memcpy(ep->b_buf, ep->req.buf, ep->req.length);
 281
 282 flush:
 283         ba = (uint32_t)ep->b_buf;
 284         flush_dcache_range(ba, ba + ep->b_len);
 285
 286         return 0;
 287 }
 288
 289 static void mv_debounce(struct mv_ep *ep)
 290 {
 291         uint32_t addr = (uint32_t)ep->req.buf;
 292         uint32_t ba = (uint32_t)ep->b_buf;
 293
 294         invalidate_dcache_range(ba, ba + ep->b_len);
 295
 296         /* Input buffer address is not aligned. */
 297         if (addr & (ARCH_DMA_MINALIGN - 1))
 298                 goto copy;
 299
 300         /* Input buffer length is not aligned. */
 301         if (ep->req.length & (ARCH_DMA_MINALIGN - 1))
 302                 goto copy;
 303
 304         /* The buffer is well aligned, only invalidate cache. */
 305         return;
 306
 307 copy:
 308         memcpy(ep->req.buf, ep->b_buf, ep->req.length);
 309
 310         /* Large payloads use allocated buffer, free it. */
 311         if (ep->req.length > 64)
 312                 free(ep->b_buf);
 313 }
 314
 315 static int mv_ep_queue(struct usb_ep *ep,
 316                 struct usb_request *req, gfp_t gfp_flags)
 317 {
 318         struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
 319         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 320         struct ept_queue_item *item;
 321         struct ept_queue_head *head;
 322         int bit, num, len, in, ret;
 323         num = mv_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 324         in = (mv_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 325         item = mv_get_qtd(num, in);
 326         head = mv_get_qh(num, in);
 327         len = req->length;
 328
 329         ret = mv_bounce(mv_ep);
 330         if (ret)
 331                 return ret;
 332
 333         item->next = TERMINATE;
 334         item->info = INFO_BYTES(len) | INFO_IOC | INFO_ACTIVE;
 335         item->page0 = (uint32_t)mv_ep->b_buf;
 336         item->page1 = ((uint32_t)mv_ep->b_buf & 0xfffff000) + 0x1000;
 337
 338         head->next = (unsigned) item;
 339         head->info = 0;
 340
 341         DBG("ept%d %s queue len %x, buffer %p\n",
 342             num, in ? "in" : "out", len, mv_ep->b_buf);
 343
 344         if (in)
 345                 bit = EPT_TX(num);
 346         else
 347                 bit = EPT_RX(num);
 348
 349         mv_flush_qh(num);
 350         mv_flush_qtd(num);
 351
 352         writel(bit, &udc->epprime);
 353
 354         return 0;
 355 }
 356
 357 static void handle_ep_complete(struct mv_ep *ep)
 358 {
 359         struct ept_queue_item *item;
 360         int num, in, len;
 361         num = ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 362         in = (ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 363         if (num == 0)
 364                 ep->desc = &ep0_out_desc;
 365         item = mv_get_qtd(num, in);
 366         mv_invalidate_qtd(num);
 367
 368         if (item->info & 0xff)
 369                 printf("EP%d/%s FAIL nfo=%x pg0=%x\n",
 370                         num, in ? "in" : "out", item->info, item->page0);
 371
 372         len = (item->info >> 16) & 0x7fff;
 373
 374         mv_debounce(ep);
 375
 376         ep->req.length -= len;
 377         DBG("ept%d %s complete %x\n",
 378                         num, in ? "in" : "out", len);
 379         ep->req.complete(&ep->ep, &ep->req);
 380         if (num == 0) {
 381                 ep->req.length = 0;
 382                 usb_ep_queue(&ep->ep, &ep->req, 0);
 383                 ep->desc = &ep0_in_desc;
 384         }
 385 }
 386
 387 #define SETUP(type, request) (((type) << 8) | (request))
 388
 389 static void handle_setup(void)
 390 {
 391         struct usb_request *req = &controller.ep[0].req;
 392         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 393         struct ept_queue_head *head;
 394         struct usb_ctrlrequest r;
 395         int status = 0;
 396         int num, in, _num, _in, i;
 397         char *buf;
 398         head = mv_get_qh(0, 0); /* EP0 OUT */
 399
 400         mv_invalidate_qh(0);
 401         memcpy(&r, head->setup_data, sizeof(struct usb_ctrlrequest));
 402         writel(EPT_RX(0), &udc->epstat);
 403         DBG("handle setup %s, %x, %x index %x value %x\n", reqname(r.bRequest),
 404             r.bRequestType, r.bRequest, r.wIndex, r.wValue);
 405
 406         switch (SETUP(r.bRequestType, r.bRequest)) {
 407         case SETUP(USB_RECIP_ENDPOINT, USB_REQ_CLEAR_FEATURE):
 408                 _num = r.wIndex & 15;
 409                 _in = !!(r.wIndex & 0x80);
 410
 411                 if ((r.wValue == 0) && (r.wLength == 0)) {
 412                         req->length = 0;
 413                         for (i = 0; i < NUM_ENDPOINTS; i++) {
 414                                 if (!controller.ep[i].desc)
 415                                         continue;
 416                                 num = controller.ep[i].desc->bEndpointAddress
 417                                                 & USB_ENDPOINT_NUMBER_MASK;
 418                                 in = (controller.ep[i].desc->bEndpointAddress
 419                                                 & USB_DIR_IN) != 0;
 420                                 if ((num == _num) && (in == _in)) {
 421                                         ep_enable(num, in);
 422                                         usb_ep_queue(controller.gadget.ep0,
 423                                                         req, 0);
 424                                         break;
 425                                 }
 426                         }
 427                 }
 428                 return;
 429
 430         case SETUP(USB_RECIP_DEVICE, USB_REQ_SET_ADDRESS):
 431                 /*
 432                  * write address delayed (will take effect
 433                  * after the next IN txn)
 434                  */
 435                 writel((r.wValue << 25) | (1 << 24), &udc->devaddr);
 436                 req->length = 0;
 437                 usb_ep_queue(controller.gadget.ep0, req, 0);
 438                 return;
 439
 440         case SETUP(USB_DIR_IN | USB_RECIP_DEVICE, USB_REQ_GET_STATUS):
 441                 req->length = 2;
 442                 buf = (char *)req->buf;
 443                 buf[0] = 1 << USB_DEVICE_SELF_POWERED;
 444                 buf[1] = 0;
 445                 usb_ep_queue(controller.gadget.ep0, req, 0);
 446                 return;
 447         }
 448         /* pass request up to the gadget driver */
 449         if (controller.driver)
 450                 status = controller.driver->setup(&controller.gadget, &r);
 451         else
 452                 status = -ENODEV;
 453
 454         if (!status)
 455                 return;
 456         DBG("STALL reqname %s type %x value %x, index %x\n",
 457             reqname(r.bRequest), r.bRequestType, r.wValue, r.wIndex);
 458         writel((1<<16) | (1 << 0), &udc->epctrl[0]);
 459 }
 460
 461 static void stop_activity(void)
 462 {
 463         int i, num, in;
 464         struct ept_queue_head *head;
 465         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 466         writel(readl(&udc->epcomp), &udc->epcomp);
 467         writel(readl(&udc->epstat), &udc->epstat);
 468         writel(0xffffffff, &udc->epflush);
 469
 470         /* error out any pending reqs */
 471         for (i = 0; i < NUM_ENDPOINTS; i++) {
 472                 if (i != 0)
 473                         writel(0, &udc->epctrl[i]);
 474                 if (controller.ep[i].desc) {
 475                         num = controller.ep[i].desc->bEndpointAddress
 476                                 & USB_ENDPOINT_NUMBER_MASK;
 477                         in = (controller.ep[i].desc->bEndpointAddress
 478                                 & USB_DIR_IN) != 0;
 479                         head = mv_get_qh(num, in);
 480                         head->info = INFO_ACTIVE;
 481                         mv_flush_qh(num);
 482                 }
 483         }
 484 }
 485
 486 void udc_irq(void)
 487 {
 488         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 489         unsigned n = readl(&udc->usbsts);
 490         writel(n, &udc->usbsts);
 491         int bit, i, num, in;
 492
 493         n &= (STS_SLI | STS_URI | STS_PCI | STS_UI | STS_UEI);
 494         if (n == 0)
 495                 return;
 496
 497         if (n & STS_URI) {
 498                 DBG("-- reset --\n");
 499                 stop_activity();
 500         }
 501         if (n & STS_SLI)
 502                 DBG("-- suspend --\n");
 503
 504         if (n & STS_PCI) {
 505                 DBG("-- portchange --\n");
 506                 bit = (readl(&udc->portsc) >> 26) & 3;
 507                 if (bit == 2) {
 508                         controller.gadget.speed = USB_SPEED_HIGH;
 509                         for (i = 1; i < NUM_ENDPOINTS && n; i++)
 510                                 if (controller.ep[i].desc)
 511                                         controller.ep[i].ep.maxpacket = 512;
 512                 } else {
 513                         controller.gadget.speed = USB_SPEED_FULL;
 514                 }
 515         }
 516
 517         if (n & STS_UEI)
 518                 printf("<UEI %x>\n", readl(&udc->epcomp));
 519
 520         if ((n & STS_UI) || (n & STS_UEI)) {
 521                 n = readl(&udc->epstat);
 522                 if (n & EPT_RX(0))
 523                         handle_setup();
 524
 525                 n = readl(&udc->epcomp);
 526                 if (n != 0)
 527                         writel(n, &udc->epcomp);
 528
 529                 for (i = 0; i < NUM_ENDPOINTS && n; i++) {
 530                         if (controller.ep[i].desc) {
 531                                 num = controller.ep[i].desc->bEndpointAddress
 532                                         & USB_ENDPOINT_NUMBER_MASK;
 533                                 in = (controller.ep[i].desc->bEndpointAddress
 534                                                 & USB_DIR_IN) != 0;
 535                                 bit = (in) ? EPT_TX(num) : EPT_RX(num);
 536                                 if (n & bit)
 537                                         handle_ep_complete(&controller.ep[i]);
 538                         }
 539                 }
 540         }
 541 }
 542
 543 int usb_gadget_handle_interrupts(void)
 544 {
 545         u32 value;
 546         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 547
 548         value = readl(&udc->usbsts);
 549         if (value)
 550                 udc_irq();
 551
 552         return value;
 553 }
 554
 555 static int mv_pullup(struct usb_gadget *gadget, int is_on)
 556 {
 557         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 558         if (is_on) {
 559                 /* RESET */
 560                 writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RST, &udc->usbcmd);
 561                 udelay(200);
 562
 563                 writel((unsigned)controller.epts, &udc->epinitaddr);
 564
 565                 /* select DEVICE mode */
 566                 writel(USBMODE_DEVICE, &udc->usbmode);
 567
 568                 writel(0xffffffff, &udc->epflush);
 569
 570                 /* Turn on the USB connection by enabling the pullup resistor */
 571                 writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RUN, &udc->usbcmd);
 572         } else {
 573                 stop_activity();
 574                 writel(USBCMD_FS2, &udc->usbcmd);
 575                 udelay(800);
 576                 if (controller.driver)
 577                         controller.driver->disconnect(gadget);
 578         }
 579
 580         return 0;
 581 }
 582
 583 void udc_disconnect(void)
 584 {
 585         struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
 586         /* disable pullup */
 587         stop_activity();
 588         writel(USBCMD_FS2, &udc->usbcmd);
 589         udelay(800);
 590         if (controller.driver)
 591                 controller.driver->disconnect(&controller.gadget);
 592 }
 593
 594 static int mvudc_probe(void)
 595 {
 596         struct ept_queue_head *head;
 597         uint8_t *imem;
 598         int i;
 599
 600         const int num = 2 * NUM_ENDPOINTS;
 601
 602         const int eplist_min_align = 4096;
 603         const int eplist_align = roundup(eplist_min_align, ARCH_DMA_MINALIGN);
 604         const int eplist_raw_sz = num * sizeof(struct ept_queue_head);
 605         const int eplist_sz = roundup(eplist_raw_sz, ARCH_DMA_MINALIGN);
 606
 607         const int ilist_align = roundup(ARCH_DMA_MINALIGN, 32);
 608         const int ilist_ent_raw_sz = 2 * sizeof(struct ept_queue_item);
 609         const int ilist_ent_sz = roundup(ilist_ent_raw_sz, ARCH_DMA_MINALIGN);
 610         const int ilist_sz = NUM_ENDPOINTS * ilist_ent_sz;
 611
 612         /* The QH list must be aligned to 4096 bytes. */
 613         controller.epts = memalign(eplist_align, eplist_sz);
 614         if (!controller.epts)
 615                 return -ENOMEM;
 616         memset(controller.epts, 0, eplist_sz);
 617
 618         /*
 619          * Each qTD item must be 32-byte aligned, each qTD touple must be
 620          * cacheline aligned. There are two qTD items for each endpoint and
 621          * only one of them is used for the endpoint at time, so we can group
 622          * them together.
 623          */
 624         controller.items_mem = memalign(ilist_align, ilist_sz);
 625         if (!controller.items_mem) {
 626                 free(controller.epts);
 627                 return -ENOMEM;
 628         }
 629
 630         for (i = 0; i < 2 * NUM_ENDPOINTS; i++) {
 631                 /*
 632                  * Configure QH for each endpoint. The structure of the QH list
 633                  * is such that each two subsequent fields, N and N+1 where N is
 634                  * even, in the QH list represent QH for one endpoint. The Nth
 635                  * entry represents OUT configuration and the N+1th entry does
 636                  * represent IN configuration of the endpoint.
 637                  */
 638                 head = controller.epts + i;
 639                 if (i < 2)
 640                         head->config = CONFIG_MAX_PKT(EP0_MAX_PACKET_SIZE)
 641                                 | CONFIG_ZLT | CONFIG_IOS;
 642                 else
 643                         head->config = CONFIG_MAX_PKT(EP_MAX_PACKET_SIZE)
 644                                 | CONFIG_ZLT;
 645                 head->next = TERMINATE;
 646                 head->info = 0;
 647
 648                 imem = controller.items_mem + ((i >> 1) * ilist_ent_sz);
 649                 if (i & 1)
 650                         imem += sizeof(struct ept_queue_item);
 651
 652                 controller.items[i] = (struct ept_queue_item *)imem;
 653
 654                 if (i & 1) {
 655                         mv_flush_qh(i - 1);
 656                         mv_flush_qtd(i - 1);
 657                 }
 658         }
 659
 660         INIT_LIST_HEAD(&controller.gadget.ep_list);
 661
 662         /* Init EP 0 */
 663         memcpy(&controller.ep[0].ep, &mv_ep_init[0], sizeof(*mv_ep_init));
 664         controller.ep[0].desc = &ep0_in_desc;
 665         controller.gadget.ep0 = &controller.ep[0].ep;
 666         INIT_LIST_HEAD(&controller.gadget.ep0->ep_list);
 667
 668         /* Init EP 1..n */
 669         for (i = 1; i < NUM_ENDPOINTS; i++) {
 670                 memcpy(&controller.ep[i].ep, &mv_ep_init[1],
 671                        sizeof(*mv_ep_init));
 672                 list_add_tail(&controller.ep[i].ep.ep_list,
 673                               &controller.gadget.ep_list);
 674         }
 675
 676         return 0;
 677 }
 678
 679 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 680 {
 681         struct mv_udc *udc;
 682         int ret;
 683
 684         if (!driver)
 685                 return -EINVAL;
 686         if (!driver->bind || !driver->setup || !driver->disconnect)
 687                 return -EINVAL;
 688         if (driver->speed != USB_SPEED_FULL && driver->speed != USB_SPEED_HIGH)
 689                 return -EINVAL;
 690
 691         ret = usb_lowlevel_init(0, (void **)&controller.ctrl);
 692         if (ret)
 693                 return ret;
 694
 695         ret = mvudc_probe();
 696         if (!ret) {
 697                 udc = (struct mv_udc *)controller.ctrl->hcor;
 698
 699                 /* select ULPI phy */
 700                 writel(PTS(PTS_ENABLE) | PFSC, &udc->portsc);
 701         }
 702
 703         ret = driver->bind(&controller.gadget);
 704         if (ret) {
 705                 DBG("driver->bind() returned %d\n", ret);
 706                 return ret;
 707         }
 708         controller.driver = driver;
 709
 710         return 0;
 711 }
 712
 713 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 714 {
 715         return 0;
 716 }