drivers/usb/gadget/s3c_udc_otg.c

   1 /*
   2  * drivers/usb/gadget/s3c_udc_otg.c
   3  * Samsung S3C on-chip full/high speed USB OTG 2.0 device controllers
   4  *
   5  * Copyright (C) 2008 for Samsung Electronics
   6  *
   7  * BSP Support for Samsung's UDC driver
   8  * available at:
   9  * git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git
  10  *
  11  * State machine bugfixes:
  12  * Marek Szyprowski <m.szyprowski@samsung.com>
  13  *
  14  * Ported to u-boot:
  15  * Marek Szyprowski <m.szyprowski@samsung.com>
  16  * Lukasz Majewski <l.majewski@samsumg.com>
  17  *
  18  * SPDX-License-Identifier:     GPL-2.0+
  19  */
  20 #undef DEBUG
  21 #include <common.h>
  22 #include <asm/errno.h>
  23 #include <linux/list.h>
  24 #include <malloc.h>
  25
  26 #include <linux/usb/ch9.h>
  27 #include <linux/usb/gadget.h>
  28
  29 #include <asm/byteorder.h>
  30 #include <asm/unaligned.h>
  31 #include <asm/io.h>
  32
  33 #include <asm/mach-types.h>
  34
  35 #include "regs-otg.h"
  36 #include <usb/lin_gadget_compat.h>
  37
  38 /***********************************************************/
  39
  40 #define OTG_DMA_MODE            1
  41
  42 #define DEBUG_SETUP 0
  43 #define DEBUG_EP0 0
  44 #define DEBUG_ISR 0
  45 #define DEBUG_OUT_EP 0
  46 #define DEBUG_IN_EP 0
  47
  48 #include <usb/s3c_udc.h>
  49
  50 #define EP0_CON         0
  51 #define EP_MASK         0xF
  52
  53 static char *state_names[] = {
  54         "WAIT_FOR_SETUP",
  55         "DATA_STATE_XMIT",
  56         "DATA_STATE_NEED_ZLP",
  57         "WAIT_FOR_OUT_STATUS",
  58         "DATA_STATE_RECV",
  59         "WAIT_FOR_COMPLETE",
  60         "WAIT_FOR_OUT_COMPLETE",
  61         "WAIT_FOR_IN_COMPLETE",
  62         "WAIT_FOR_NULL_COMPLETE",
  63 };
  64
  65 #define DRIVER_DESC "S3C HS USB OTG Device Driver, (c) Samsung Electronics"
  66 #define DRIVER_VERSION "15 March 2009"
  67
  68 struct s3c_udc  *the_controller;
  69
  70 static const char driver_name[] = "s3c-udc";
  71 static const char driver_desc[] = DRIVER_DESC;
  72 static const char ep0name[] = "ep0-control";
  73
  74 /* Max packet size*/
  75 static unsigned int ep0_fifo_size = 64;
  76 static unsigned int ep_fifo_size =  512;
  77 static unsigned int ep_fifo_size2 = 1024;
  78 static int reset_available = 1;
  79
  80 static struct usb_ctrlrequest *usb_ctrl;
  81 static dma_addr_t usb_ctrl_dma_addr;
  82
  83 /*
  84   Local declarations.
  85 */
  86 static int s3c_ep_enable(struct usb_ep *ep,
  87                          const struct usb_endpoint_descriptor *);
  88 static int s3c_ep_disable(struct usb_ep *ep);
  89 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
  90                                              gfp_t gfp_flags);
  91 static void s3c_free_request(struct usb_ep *ep, struct usb_request *);
  92
  93 static int s3c_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
  94 static int s3c_dequeue(struct usb_ep *ep, struct usb_request *);
  95 static int s3c_fifo_status(struct usb_ep *ep);
  96 static void s3c_fifo_flush(struct usb_ep *ep);
  97 static void s3c_ep0_read(struct s3c_udc *dev);
  98 static void s3c_ep0_kick(struct s3c_udc *dev, struct s3c_ep *ep);
  99 static void s3c_handle_ep0(struct s3c_udc *dev);
 100 static int s3c_ep0_write(struct s3c_udc *dev);
 101 static int write_fifo_ep0(struct s3c_ep *ep, struct s3c_request *req);
 102 static void done(struct s3c_ep *ep, struct s3c_request *req, int status);
 103 static void stop_activity(struct s3c_udc *dev,
 104                           struct usb_gadget_driver *driver);
 105 static int udc_enable(struct s3c_udc *dev);
 106 static void udc_set_address(struct s3c_udc *dev, unsigned char address);
 107 static void reconfig_usbd(struct s3c_udc *dev);
 108 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed);
 109 static void nuke(struct s3c_ep *ep, int status);
 110 static int s3c_udc_set_halt(struct usb_ep *_ep, int value);
 111 static void s3c_udc_set_nak(struct s3c_ep *ep);
 112
 113 void set_udc_gadget_private_data(void *p)
 114 {
 115         debug_cond(DEBUG_SETUP != 0,
 116                    "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 117                    the_controller, p);
 118         the_controller->gadget.dev.device_data = p;
 119 }
 120
 121 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 122 {
 123         return gadget->dev.device_data;
 124 }
 125
 126 static struct usb_ep_ops s3c_ep_ops = {
 127         .enable = s3c_ep_enable,
 128         .disable = s3c_ep_disable,
 129
 130         .alloc_request = s3c_alloc_request,
 131         .free_request = s3c_free_request,
 132
 133         .queue = s3c_queue,
 134         .dequeue = s3c_dequeue,
 135
 136         .set_halt = s3c_udc_set_halt,
 137         .fifo_status = s3c_fifo_status,
 138         .fifo_flush = s3c_fifo_flush,
 139 };
 140
 141 #define create_proc_files() do {} while (0)
 142 #define remove_proc_files() do {} while (0)
 143
 144 /***********************************************************/
 145
 146 void __iomem            *regs_otg;
 147 struct s3c_usbotg_reg *reg;
 148
 149 bool dfu_usb_get_reset(void)
 150 {
 151         return !!(readl(&reg->gintsts) & INT_RESET);
 152 }
 153
 154 __weak void otg_phy_init(struct s3c_udc *dev) {}
 155 __weak void otg_phy_off(struct s3c_udc *dev) {}
 156
 157 /***********************************************************/
 158
 159 #include "s3c_udc_otg_xfer_dma.c"
 160
 161 /*
 162  *      udc_disable - disable USB device controller
 163  */
 164 static void udc_disable(struct s3c_udc *dev)
 165 {
 166         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 167
 168         udc_set_address(dev, 0);
 169
 170         dev->ep0state = WAIT_FOR_SETUP;
 171         dev->gadget.speed = USB_SPEED_UNKNOWN;
 172         dev->usb_address = 0;
 173
 174         otg_phy_off(dev);
 175 }
 176
 177 /*
 178  *      udc_reinit - initialize software state
 179  */
 180 static void udc_reinit(struct s3c_udc *dev)
 181 {
 182         unsigned int i;
 183
 184         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 185
 186         /* device/ep0 records init */
 187         INIT_LIST_HEAD(&dev->gadget.ep_list);
 188         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 189         dev->ep0state = WAIT_FOR_SETUP;
 190
 191         /* basic endpoint records init */
 192         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 193                 struct s3c_ep *ep = &dev->ep[i];
 194
 195                 if (i != 0)
 196                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 197
 198                 ep->desc = 0;
 199                 ep->stopped = 0;
 200                 INIT_LIST_HEAD(&ep->queue);
 201                 ep->pio_irqs = 0;
 202         }
 203
 204         /* the rest was statically initialized, and is read-only */
 205 }
 206
 207 #define BYTES2MAXP(x)   (x / 8)
 208 #define MAXP2BYTES(x)   (x * 8)
 209
 210 /* until it's enabled, this UDC should be completely invisible
 211  * to any USB host.
 212  */
 213 static int udc_enable(struct s3c_udc *dev)
 214 {
 215         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 216
 217         otg_phy_init(dev);
 218         reconfig_usbd(dev);
 219
 220         debug_cond(DEBUG_SETUP != 0,
 221                    "S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 222                     readl(&reg->gintmsk));
 223
 224         dev->gadget.speed = USB_SPEED_UNKNOWN;
 225
 226         return 0;
 227 }
 228
 229 /*
 230   Register entry point for the peripheral controller driver.
 231 */
 232 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 233 {
 234         struct s3c_udc *dev = the_controller;
 235         int retval = 0;
 236         unsigned long flags = 0;
 237
 238         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 239
 240         if (!driver
 241             || (driver->speed != USB_SPEED_FULL
 242                 && driver->speed != USB_SPEED_HIGH)
 243             || !driver->bind || !driver->disconnect || !driver->setup)
 244                 return -EINVAL;
 245         if (!dev)
 246                 return -ENODEV;
 247         if (dev->driver)
 248                 return -EBUSY;
 249
 250         spin_lock_irqsave(&dev->lock, flags);
 251         /* first hook up the driver ... */
 252         dev->driver = driver;
 253         spin_unlock_irqrestore(&dev->lock, flags);
 254
 255         if (retval) { /* TODO */
 256                 printf("target device_add failed, error %d\n", retval);
 257                 return retval;
 258         }
 259
 260         retval = driver->bind(&dev->gadget);
 261         if (retval) {
 262                 debug_cond(DEBUG_SETUP != 0,
 263                            "%s: bind to driver --> error %d\n",
 264                             dev->gadget.name, retval);
 265                 dev->driver = 0;
 266                 return retval;
 267         }
 268
 269         enable_irq(IRQ_OTG);
 270
 271         debug_cond(DEBUG_SETUP != 0,
 272                    "Registered gadget driver %s\n", dev->gadget.name);
 273         udc_enable(dev);
 274
 275         return 0;
 276 }
 277
 278 /*
 279  * Unregister entry point for the peripheral controller driver.
 280  */
 281 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 282 {
 283         struct s3c_udc *dev = the_controller;
 284         unsigned long flags = 0;
 285
 286         if (!dev)
 287                 return -ENODEV;
 288         if (!driver || driver != dev->driver)
 289                 return -EINVAL;
 290
 291         spin_lock_irqsave(&dev->lock, flags);
 292         dev->driver = 0;
 293         stop_activity(dev, driver);
 294         spin_unlock_irqrestore(&dev->lock, flags);
 295
 296         driver->unbind(&dev->gadget);
 297
 298         disable_irq(IRQ_OTG);
 299
 300         udc_disable(dev);
 301         return 0;
 302 }
 303
 304 /*
 305  *      done - retire a request; caller blocked irqs
 306  */
 307 static void done(struct s3c_ep *ep, struct s3c_request *req, int status)
 308 {
 309         unsigned int stopped = ep->stopped;
 310
 311         debug("%s: %s %p, req = %p, stopped = %d\n",
 312               __func__, ep->ep.name, ep, &req->req, stopped);
 313
 314         list_del_init(&req->queue);
 315
 316         if (likely(req->req.status == -EINPROGRESS))
 317                 req->req.status = status;
 318         else
 319                 status = req->req.status;
 320
 321         if (status && status != -ESHUTDOWN) {
 322                 debug("complete %s req %p stat %d len %u/%u\n",
 323                       ep->ep.name, &req->req, status,
 324                       req->req.actual, req->req.length);
 325         }
 326
 327         /* don't modify queue heads during completion callback */
 328         ep->stopped = 1;
 329
 330 #ifdef DEBUG
 331         printf("calling complete callback\n");
 332         {
 333                 int i, len = req->req.length;
 334
 335                 printf("pkt[%d] = ", req->req.length);
 336                 if (len > 64)
 337                         len = 64;
 338                 for (i = 0; i < len; i++) {
 339                         printf("%02x", ((u8 *)req->req.buf)[i]);
 340                         if ((i & 7) == 7)
 341                                 printf(" ");
 342                 }
 343                 printf("\n");
 344         }
 345 #endif
 346         spin_unlock(&ep->dev->lock);
 347         req->req.complete(&ep->ep, &req->req);
 348         spin_lock(&ep->dev->lock);
 349
 350         debug("callback completed\n");
 351
 352         ep->stopped = stopped;
 353 }
 354
 355 /*
 356  *      nuke - dequeue ALL requests
 357  */
 358 static void nuke(struct s3c_ep *ep, int status)
 359 {
 360         struct s3c_request *req;
 361
 362         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 363
 364         /* called with irqs blocked */
 365         while (!list_empty(&ep->queue)) {
 366                 req = list_entry(ep->queue.next, struct s3c_request, queue);
 367                 done(ep, req, status);
 368         }
 369 }
 370
 371 static void stop_activity(struct s3c_udc *dev,
 372                           struct usb_gadget_driver *driver)
 373 {
 374         int i;
 375
 376         /* don't disconnect drivers more than once */
 377         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 378                 driver = 0;
 379         dev->gadget.speed = USB_SPEED_UNKNOWN;
 380
 381         /* prevent new request submissions, kill any outstanding requests  */
 382         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 383                 struct s3c_ep *ep = &dev->ep[i];
 384                 ep->stopped = 1;
 385                 nuke(ep, -ESHUTDOWN);
 386         }
 387
 388         /* report disconnect; the driver is already quiesced */
 389         if (driver) {
 390                 spin_unlock(&dev->lock);
 391                 driver->disconnect(&dev->gadget);
 392                 spin_lock(&dev->lock);
 393         }
 394
 395         /* re-init driver-visible data structures */
 396         udc_reinit(dev);
 397 }
 398
 399 static void reconfig_usbd(struct s3c_udc *dev)
 400 {
 401         /* 2. Soft-reset OTG Core and then unreset again. */
 402         int i;
 403         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 404         uint32_t dflt_gusbcfg;
 405
 406         debug("Reseting OTG controller\n");
 407
 408         dflt_gusbcfg =
 409                 0<<15           /* PHY Low Power Clock sel*/
 410                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 411                 |0x5<<10        /* Turnaround time*/
 412                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 413                                 /* 1:SRP enable] H1= 1,1*/
 414                 |0<<7           /* Ulpi DDR sel*/
 415                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 416                 |0<<4           /* 0: utmi+, 1:ulpi*/
 417                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 418                 |0x7<<0;        /* HS/FS Timeout**/
 419
 420         if (dev->pdata->usb_gusbcfg)
 421                 dflt_gusbcfg = dev->pdata->usb_gusbcfg;
 422
 423         writel(dflt_gusbcfg, &reg->gusbcfg);
 424
 425         /* 3. Put the OTG device core in the disconnected state.*/
 426         uTemp = readl(&reg->dctl);
 427         uTemp |= SOFT_DISCONNECT;
 428         writel(uTemp, &reg->dctl);
 429
 430         udelay(20);
 431
 432         /* 4. Make the OTG device core exit from the disconnected state.*/
 433         uTemp = readl(&reg->dctl);
 434         uTemp = uTemp & ~SOFT_DISCONNECT;
 435         writel(uTemp, &reg->dctl);
 436
 437         /* 5. Configure OTG Core to initial settings of device mode.*/
 438         /* [][1: full speed(30Mhz) 0:high speed]*/
 439         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 440
 441         mdelay(1);
 442
 443         /* 6. Unmask the core interrupts*/
 444         writel(GINTMSK_INIT, &reg->gintmsk);
 445
 446         /* 7. Set NAK bit of EP0, EP1, EP2*/
 447         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 448         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 449
 450         for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
 451                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 452                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 453         }
 454
 455         /* 8. Unmask EPO interrupts*/
 456         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 457                | (1 << EP0_CON), &reg->daintmsk);
 458
 459         /* 9. Unmask device OUT EP common interrupts*/
 460         writel(DOEPMSK_INIT, &reg->doepmsk);
 461
 462         /* 10. Unmask device IN EP common interrupts*/
 463         writel(DIEPMSK_INIT, &reg->diepmsk);
 464
 465         /* 11. Set Rx FIFO Size (in 32-bit words) */
 466         writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);
 467
 468         /* 12. Set Non Periodic Tx FIFO Size */
 469         writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0,
 470                &reg->gnptxfsiz);
 471
 472         for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
 473                 writel((PTX_FIFO_SIZE >> 2) << 16 |
 474                        ((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
 475                          PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
 476                        &reg->dieptxf[i-1]);
 477
 478         /* Flush the RX FIFO */
 479         writel(RX_FIFO_FLUSH, &reg->grstctl);
 480         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 481                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 482
 483         /* Flush all the Tx FIFO's */
 484         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 485         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 486         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 487                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 488
 489         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 490         /* For Slave mode*/
 491         /* EP0: Control OUT */
 492         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 493                &reg->out_endp[EP0_CON].doepctl);
 494
 495         /* 14. Initialize OTG Link Core.*/
 496         writel(GAHBCFG_INIT, &reg->gahbcfg);
 497 }
 498
 499 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
 500 {
 501         unsigned int ep_ctrl;
 502         int i;
 503
 504         if (speed == USB_SPEED_HIGH) {
 505                 ep0_fifo_size = 64;
 506                 ep_fifo_size = 512;
 507                 ep_fifo_size2 = 1024;
 508                 dev->gadget.speed = USB_SPEED_HIGH;
 509         } else {
 510                 ep0_fifo_size = 64;
 511                 ep_fifo_size = 64;
 512                 ep_fifo_size2 = 64;
 513                 dev->gadget.speed = USB_SPEED_FULL;
 514         }
 515
 516         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 517         for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
 518                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 519
 520         /* EP0 - Control IN (64 bytes)*/
 521         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 522         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 523
 524         /* EP0 - Control OUT (64 bytes)*/
 525         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 526         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 527 }
 528
 529 static int s3c_ep_enable(struct usb_ep *_ep,
 530                          const struct usb_endpoint_descriptor *desc)
 531 {
 532         struct s3c_ep *ep;
 533         struct s3c_udc *dev;
 534         unsigned long flags = 0;
 535
 536         debug("%s: %p\n", __func__, _ep);
 537
 538         ep = container_of(_ep, struct s3c_ep, ep);
 539         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 540             || desc->bDescriptorType != USB_DT_ENDPOINT
 541             || ep->bEndpointAddress != desc->bEndpointAddress
 542             || ep_maxpacket(ep) <
 543             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 544
 545                 debug("%s: bad ep or descriptor\n", __func__);
 546                 return -EINVAL;
 547         }
 548
 549         /* xfer types must match, except that interrupt ~= bulk */
 550         if (ep->bmAttributes != desc->bmAttributes
 551             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 552             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 553
 554                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 555                 return -EINVAL;
 556         }
 557
 558         /* hardware _could_ do smaller, but driver doesn't */
 559         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 560              && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
 561              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 562
 563                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 564                 return -ERANGE;
 565         }
 566
 567         dev = ep->dev;
 568         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 569
 570                 debug("%s: bogus device state\n", __func__);
 571                 return -ESHUTDOWN;
 572         }
 573
 574         ep->stopped = 0;
 575         ep->desc = desc;
 576         ep->pio_irqs = 0;
 577         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 578
 579         /* Reset halt state */
 580         s3c_udc_set_nak(ep);
 581         s3c_udc_set_halt(_ep, 0);
 582
 583         spin_lock_irqsave(&ep->dev->lock, flags);
 584         s3c_udc_ep_activate(ep);
 585         spin_unlock_irqrestore(&ep->dev->lock, flags);
 586
 587         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 588               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 589         return 0;
 590 }
 591
 592 /*
 593  * Disable EP
 594  */
 595 static int s3c_ep_disable(struct usb_ep *_ep)
 596 {
 597         struct s3c_ep *ep;
 598         unsigned long flags = 0;
 599
 600         debug("%s: %p\n", __func__, _ep);
 601
 602         ep = container_of(_ep, struct s3c_ep, ep);
 603         if (!_ep || !ep->desc) {
 604                 debug("%s: %s not enabled\n", __func__,
 605                       _ep ? ep->ep.name : NULL);
 606                 return -EINVAL;
 607         }
 608
 609         spin_lock_irqsave(&ep->dev->lock, flags);
 610
 611         /* Nuke all pending requests */
 612         nuke(ep, -ESHUTDOWN);
 613
 614         ep->desc = 0;
 615         ep->stopped = 1;
 616
 617         spin_unlock_irqrestore(&ep->dev->lock, flags);
 618
 619         debug("%s: disabled %s\n", __func__, _ep->name);
 620         return 0;
 621 }
 622
 623 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 624                                              gfp_t gfp_flags)
 625 {
 626         struct s3c_request *req;
 627
 628         debug("%s: %s %p\n", __func__, ep->name, ep);
 629
 630         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 631         if (!req)
 632                 return 0;
 633
 634         memset(req, 0, sizeof *req);
 635         INIT_LIST_HEAD(&req->queue);
 636
 637         return &req->req;
 638 }
 639
 640 static void s3c_free_request(struct usb_ep *ep, struct usb_request *_req)
 641 {
 642         struct s3c_request *req;
 643
 644         debug("%s: %p\n", __func__, ep);
 645
 646         req = container_of(_req, struct s3c_request, req);
 647         WARN_ON(!list_empty(&req->queue));
 648         kfree(req);
 649 }
 650
 651 /* dequeue JUST ONE request */
 652 static int s3c_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 653 {
 654         struct s3c_ep *ep;
 655         struct s3c_request *req;
 656         unsigned long flags = 0;
 657
 658         debug("%s: %p\n", __func__, _ep);
 659
 660         ep = container_of(_ep, struct s3c_ep, ep);
 661         if (!_ep || ep->ep.name == ep0name)
 662                 return -EINVAL;
 663
 664         spin_lock_irqsave(&ep->dev->lock, flags);
 665
 666         /* make sure it's actually queued on this endpoint */
 667         list_for_each_entry(req, &ep->queue, queue) {
 668                 if (&req->req == _req)
 669                         break;
 670         }
 671         if (&req->req != _req) {
 672                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 673                 return -EINVAL;
 674         }
 675
 676         done(ep, req, -ECONNRESET);
 677
 678         spin_unlock_irqrestore(&ep->dev->lock, flags);
 679         return 0;
 680 }
 681
 682 /*
 683  * Return bytes in EP FIFO
 684  */
 685 static int s3c_fifo_status(struct usb_ep *_ep)
 686 {
 687         int count = 0;
 688         struct s3c_ep *ep;
 689
 690         ep = container_of(_ep, struct s3c_ep, ep);
 691         if (!_ep) {
 692                 debug("%s: bad ep\n", __func__);
 693                 return -ENODEV;
 694         }
 695
 696         debug("%s: %d\n", __func__, ep_index(ep));
 697
 698         /* LPD can't report unclaimed bytes from IN fifos */
 699         if (ep_is_in(ep))
 700                 return -EOPNOTSUPP;
 701
 702         return count;
 703 }
 704
 705 /*
 706  * Flush EP FIFO
 707  */
 708 static void s3c_fifo_flush(struct usb_ep *_ep)
 709 {
 710         struct s3c_ep *ep;
 711
 712         ep = container_of(_ep, struct s3c_ep, ep);
 713         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 714                 debug("%s: bad ep\n", __func__);
 715                 return;
 716         }
 717
 718         debug("%s: %d\n", __func__, ep_index(ep));
 719 }
 720
 721 static const struct usb_gadget_ops s3c_udc_ops = {
 722         /* current versions must always be self-powered */
 723 };
 724
 725 static struct s3c_udc memory = {
 726         .usb_address = 0,
 727         .gadget = {
 728                 .ops = &s3c_udc_ops,
 729                 .ep0 = &memory.ep[0].ep,
 730                 .name = driver_name,
 731         },
 732
 733         /* control endpoint */
 734         .ep[0] = {
 735                 .ep = {
 736                         .name = ep0name,
 737                         .ops = &s3c_ep_ops,
 738                         .maxpacket = EP0_FIFO_SIZE,
 739                 },
 740                 .dev = &memory,
 741
 742                 .bEndpointAddress = 0,
 743                 .bmAttributes = 0,
 744
 745                 .ep_type = ep_control,
 746         },
 747
 748         /* first group of endpoints */
 749         .ep[1] = {
 750                 .ep = {
 751                         .name = "ep1in-bulk",
 752                         .ops = &s3c_ep_ops,
 753                         .maxpacket = EP_FIFO_SIZE,
 754                 },
 755                 .dev = &memory,
 756
 757                 .bEndpointAddress = USB_DIR_IN | 1,
 758                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 759
 760                 .ep_type = ep_bulk_out,
 761                 .fifo_num = 1,
 762         },
 763
 764         .ep[2] = {
 765                 .ep = {
 766                         .name = "ep2out-bulk",
 767                         .ops = &s3c_ep_ops,
 768                         .maxpacket = EP_FIFO_SIZE,
 769                 },
 770                 .dev = &memory,
 771
 772                 .bEndpointAddress = USB_DIR_OUT | 2,
 773                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 774
 775                 .ep_type = ep_bulk_in,
 776                 .fifo_num = 2,
 777         },
 778
 779         .ep[3] = {
 780                 .ep = {
 781                         .name = "ep3in-int",
 782                         .ops = &s3c_ep_ops,
 783                         .maxpacket = EP_FIFO_SIZE,
 784                 },
 785                 .dev = &memory,
 786
 787                 .bEndpointAddress = USB_DIR_IN | 3,
 788                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 789
 790                 .ep_type = ep_interrupt,
 791                 .fifo_num = 3,
 792         },
 793 };
 794
 795 /*
 796  *      probe - binds to the platform device
 797  */
 798
 799 int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
 800 {
 801         struct s3c_udc *dev = &memory;
 802         int retval = 0;
 803
 804         debug("%s: %p\n", __func__, pdata);
 805
 806         dev->pdata = pdata;
 807
 808         reg = (struct s3c_usbotg_reg *)pdata->regs_otg;
 809
 810         /* regs_otg = (void *)pdata->regs_otg; */
 811
 812         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 813         dev->gadget.is_otg = 0;
 814         dev->gadget.is_a_peripheral = 0;
 815         dev->gadget.b_hnp_enable = 0;
 816         dev->gadget.a_hnp_support = 0;
 817         dev->gadget.a_alt_hnp_support = 0;
 818
 819         the_controller = dev;
 820
 821         usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 822                             ROUND(sizeof(struct usb_ctrlrequest),
 823                                   CONFIG_SYS_CACHELINE_SIZE));
 824         if (!usb_ctrl) {
 825                 error("No memory available for UDC!\n");
 826                 return -ENOMEM;
 827         }
 828
 829         usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;
 830
 831         udc_reinit(dev);
 832
 833         return retval;
 834 }
 835
 836 int usb_gadget_handle_interrupts()
 837 {
 838         u32 intr_status = readl(&reg->gintsts);
 839         u32 gintmsk = readl(&reg->gintmsk);
 840
 841         if (intr_status & gintmsk)
 842                 return s3c_udc_irq(1, (void *)the_controller);
 843         return 0;
 844 }