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 #include <asm/arch/gpio.h>
  35
  36 #include "regs-otg.h"
  37 #include <usb/lin_gadget_compat.h>
  38
  39 /***********************************************************/
  40
  41 #define OTG_DMA_MODE            1
  42
  43 #define DEBUG_SETUP 0
  44 #define DEBUG_EP0 0
  45 #define DEBUG_ISR 0
  46 #define DEBUG_OUT_EP 0
  47 #define DEBUG_IN_EP 0
  48
  49 #include <usb/s3c_udc.h>
  50
  51 #define EP0_CON         0
  52 #define EP_MASK         0xF
  53
  54 static char *state_names[] = {
  55         "WAIT_FOR_SETUP",
  56         "DATA_STATE_XMIT",
  57         "DATA_STATE_NEED_ZLP",
  58         "WAIT_FOR_OUT_STATUS",
  59         "DATA_STATE_RECV",
  60         "WAIT_FOR_COMPLETE",
  61         "WAIT_FOR_OUT_COMPLETE",
  62         "WAIT_FOR_IN_COMPLETE",
  63         "WAIT_FOR_NULL_COMPLETE",
  64 };
  65
  66 #define DRIVER_DESC "S3C HS USB OTG Device Driver, (c) Samsung Electronics"
  67 #define DRIVER_VERSION "15 March 2009"
  68
  69 struct s3c_udc  *the_controller;
  70
  71 static const char driver_name[] = "s3c-udc";
  72 static const char driver_desc[] = DRIVER_DESC;
  73 static const char ep0name[] = "ep0-control";
  74
  75 /* Max packet size*/
  76 static unsigned int ep0_fifo_size = 64;
  77 static unsigned int ep_fifo_size =  512;
  78 static unsigned int ep_fifo_size2 = 1024;
  79 static int reset_available = 1;
  80
  81 static struct usb_ctrlrequest *usb_ctrl;
  82 static dma_addr_t usb_ctrl_dma_addr;
  83
  84 /*
  85   Local declarations.
  86 */
  87 static int s3c_ep_enable(struct usb_ep *ep,
  88                          const struct usb_endpoint_descriptor *);
  89 static int s3c_ep_disable(struct usb_ep *ep);
  90 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
  91                                              gfp_t gfp_flags);
  92 static void s3c_free_request(struct usb_ep *ep, struct usb_request *);
  93
  94 static int s3c_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
  95 static int s3c_dequeue(struct usb_ep *ep, struct usb_request *);
  96 static int s3c_fifo_status(struct usb_ep *ep);
  97 static void s3c_fifo_flush(struct usb_ep *ep);
  98 static void s3c_ep0_read(struct s3c_udc *dev);
  99 static void s3c_ep0_kick(struct s3c_udc *dev, struct s3c_ep *ep);
 100 static void s3c_handle_ep0(struct s3c_udc *dev);
 101 static int s3c_ep0_write(struct s3c_udc *dev);
 102 static int write_fifo_ep0(struct s3c_ep *ep, struct s3c_request *req);
 103 static void done(struct s3c_ep *ep, struct s3c_request *req, int status);
 104 static void stop_activity(struct s3c_udc *dev,
 105                           struct usb_gadget_driver *driver);
 106 static int udc_enable(struct s3c_udc *dev);
 107 static void udc_set_address(struct s3c_udc *dev, unsigned char address);
 108 static void reconfig_usbd(void);
 109 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed);
 110 static void nuke(struct s3c_ep *ep, int status);
 111 static int s3c_udc_set_halt(struct usb_ep *_ep, int value);
 112 static void s3c_udc_set_nak(struct s3c_ep *ep);
 113
 114 void set_udc_gadget_private_data(void *p)
 115 {
 116         debug_cond(DEBUG_SETUP != 0,
 117                    "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 118                    the_controller, p);
 119         the_controller->gadget.dev.device_data = p;
 120 }
 121
 122 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 123 {
 124         return gadget->dev.device_data;
 125 }
 126
 127 static struct usb_ep_ops s3c_ep_ops = {
 128         .enable = s3c_ep_enable,
 129         .disable = s3c_ep_disable,
 130
 131         .alloc_request = s3c_alloc_request,
 132         .free_request = s3c_free_request,
 133
 134         .queue = s3c_queue,
 135         .dequeue = s3c_dequeue,
 136
 137         .set_halt = s3c_udc_set_halt,
 138         .fifo_status = s3c_fifo_status,
 139         .fifo_flush = s3c_fifo_flush,
 140 };
 141
 142 #define create_proc_files() do {} while (0)
 143 #define remove_proc_files() do {} while (0)
 144
 145 /***********************************************************/
 146
 147 void __iomem            *regs_otg;
 148 struct s3c_usbotg_reg *reg;
 149 struct s3c_usbotg_phy *phy;
 150 static unsigned int usb_phy_ctrl;
 151
 152 void otg_phy_init(struct s3c_udc *dev)
 153 {
 154         dev->pdata->phy_control(1);
 155
 156         /*USB PHY0 Enable */
 157         printf("USB PHY0 Enable\n");
 158
 159         /* Enable PHY */
 160         writel(readl(usb_phy_ctrl) | USB_PHY_CTRL_EN0, usb_phy_ctrl);
 161
 162         if (dev->pdata->usb_flags == PHY0_SLEEP) /* C210 Universal */
 163                 writel((readl(&phy->phypwr)
 164                         &~(PHY_0_SLEEP | OTG_DISABLE_0 | ANALOG_PWRDOWN)
 165                         &~FORCE_SUSPEND_0), &phy->phypwr);
 166         else /* C110 GONI */
 167                 writel((readl(&phy->phypwr) &~(OTG_DISABLE_0 | ANALOG_PWRDOWN)
 168                         &~FORCE_SUSPEND_0), &phy->phypwr);
 169
 170         writel((readl(&phy->phyclk) &~(ID_PULLUP0 | COMMON_ON_N0)) |
 171                CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
 172
 173         writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
 174                | PHY_SW_RST0, &phy->rstcon);
 175         udelay(10);
 176         writel(readl(&phy->rstcon)
 177                &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
 178         udelay(10);
 179 }
 180
 181 void otg_phy_off(struct s3c_udc *dev)
 182 {
 183         /* reset controller just in case */
 184         writel(PHY_SW_RST0, &phy->rstcon);
 185         udelay(20);
 186         writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
 187         udelay(20);
 188
 189         writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
 190                | FORCE_SUSPEND_0, &phy->phypwr);
 191
 192         writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
 193
 194         writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
 195               &phy->phyclk);
 196
 197         udelay(10000);
 198
 199         dev->pdata->phy_control(0);
 200 }
 201
 202 /***********************************************************/
 203
 204 #include "s3c_udc_otg_xfer_dma.c"
 205
 206 /*
 207  *      udc_disable - disable USB device controller
 208  */
 209 static void udc_disable(struct s3c_udc *dev)
 210 {
 211         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 212
 213         udc_set_address(dev, 0);
 214
 215         dev->ep0state = WAIT_FOR_SETUP;
 216         dev->gadget.speed = USB_SPEED_UNKNOWN;
 217         dev->usb_address = 0;
 218
 219         otg_phy_off(dev);
 220 }
 221
 222 /*
 223  *      udc_reinit - initialize software state
 224  */
 225 static void udc_reinit(struct s3c_udc *dev)
 226 {
 227         unsigned int i;
 228
 229         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 230
 231         /* device/ep0 records init */
 232         INIT_LIST_HEAD(&dev->gadget.ep_list);
 233         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 234         dev->ep0state = WAIT_FOR_SETUP;
 235
 236         /* basic endpoint records init */
 237         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 238                 struct s3c_ep *ep = &dev->ep[i];
 239
 240                 if (i != 0)
 241                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 242
 243                 ep->desc = 0;
 244                 ep->stopped = 0;
 245                 INIT_LIST_HEAD(&ep->queue);
 246                 ep->pio_irqs = 0;
 247         }
 248
 249         /* the rest was statically initialized, and is read-only */
 250 }
 251
 252 #define BYTES2MAXP(x)   (x / 8)
 253 #define MAXP2BYTES(x)   (x * 8)
 254
 255 /* until it's enabled, this UDC should be completely invisible
 256  * to any USB host.
 257  */
 258 static int udc_enable(struct s3c_udc *dev)
 259 {
 260         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 261
 262         otg_phy_init(dev);
 263         reconfig_usbd();
 264
 265         debug_cond(DEBUG_SETUP != 0,
 266                    "S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 267                     readl(&reg->gintmsk));
 268
 269         dev->gadget.speed = USB_SPEED_UNKNOWN;
 270
 271         return 0;
 272 }
 273
 274 /*
 275   Register entry point for the peripheral controller driver.
 276 */
 277 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 278 {
 279         struct s3c_udc *dev = the_controller;
 280         int retval = 0;
 281         unsigned long flags;
 282
 283         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 284
 285         if (!driver
 286             || (driver->speed != USB_SPEED_FULL
 287                 && driver->speed != USB_SPEED_HIGH)
 288             || !driver->bind || !driver->disconnect || !driver->setup)
 289                 return -EINVAL;
 290         if (!dev)
 291                 return -ENODEV;
 292         if (dev->driver)
 293                 return -EBUSY;
 294
 295         spin_lock_irqsave(&dev->lock, flags);
 296         /* first hook up the driver ... */
 297         dev->driver = driver;
 298         spin_unlock_irqrestore(&dev->lock, flags);
 299
 300         if (retval) { /* TODO */
 301                 printf("target device_add failed, error %d\n", retval);
 302                 return retval;
 303         }
 304
 305         retval = driver->bind(&dev->gadget);
 306         if (retval) {
 307                 debug_cond(DEBUG_SETUP != 0,
 308                            "%s: bind to driver --> error %d\n",
 309                             dev->gadget.name, retval);
 310                 dev->driver = 0;
 311                 return retval;
 312         }
 313
 314         enable_irq(IRQ_OTG);
 315
 316         debug_cond(DEBUG_SETUP != 0,
 317                    "Registered gadget driver %s\n", dev->gadget.name);
 318         udc_enable(dev);
 319
 320         return 0;
 321 }
 322
 323 /*
 324  * Unregister entry point for the peripheral controller driver.
 325  */
 326 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 327 {
 328         struct s3c_udc *dev = the_controller;
 329         unsigned long flags;
 330
 331         if (!dev)
 332                 return -ENODEV;
 333         if (!driver || driver != dev->driver)
 334                 return -EINVAL;
 335
 336         spin_lock_irqsave(&dev->lock, flags);
 337         dev->driver = 0;
 338         stop_activity(dev, driver);
 339         spin_unlock_irqrestore(&dev->lock, flags);
 340
 341         driver->unbind(&dev->gadget);
 342
 343         disable_irq(IRQ_OTG);
 344
 345         udc_disable(dev);
 346         return 0;
 347 }
 348
 349 /*
 350  *      done - retire a request; caller blocked irqs
 351  */
 352 static void done(struct s3c_ep *ep, struct s3c_request *req, int status)
 353 {
 354         unsigned int stopped = ep->stopped;
 355
 356         debug("%s: %s %p, req = %p, stopped = %d\n",
 357               __func__, ep->ep.name, ep, &req->req, stopped);
 358
 359         list_del_init(&req->queue);
 360
 361         if (likely(req->req.status == -EINPROGRESS))
 362                 req->req.status = status;
 363         else
 364                 status = req->req.status;
 365
 366         if (status && status != -ESHUTDOWN) {
 367                 debug("complete %s req %p stat %d len %u/%u\n",
 368                       ep->ep.name, &req->req, status,
 369                       req->req.actual, req->req.length);
 370         }
 371
 372         /* don't modify queue heads during completion callback */
 373         ep->stopped = 1;
 374
 375 #ifdef DEBUG
 376         printf("calling complete callback\n");
 377         {
 378                 int i, len = req->req.length;
 379
 380                 printf("pkt[%d] = ", req->req.length);
 381                 if (len > 64)
 382                         len = 64;
 383                 for (i = 0; i < len; i++) {
 384                         printf("%02x", ((u8 *)req->req.buf)[i]);
 385                         if ((i & 7) == 7)
 386                                 printf(" ");
 387                 }
 388                 printf("\n");
 389         }
 390 #endif
 391         spin_unlock(&ep->dev->lock);
 392         req->req.complete(&ep->ep, &req->req);
 393         spin_lock(&ep->dev->lock);
 394
 395         debug("callback completed\n");
 396
 397         ep->stopped = stopped;
 398 }
 399
 400 /*
 401  *      nuke - dequeue ALL requests
 402  */
 403 static void nuke(struct s3c_ep *ep, int status)
 404 {
 405         struct s3c_request *req;
 406
 407         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 408
 409         /* called with irqs blocked */
 410         while (!list_empty(&ep->queue)) {
 411                 req = list_entry(ep->queue.next, struct s3c_request, queue);
 412                 done(ep, req, status);
 413         }
 414 }
 415
 416 static void stop_activity(struct s3c_udc *dev,
 417                           struct usb_gadget_driver *driver)
 418 {
 419         int i;
 420
 421         /* don't disconnect drivers more than once */
 422         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 423                 driver = 0;
 424         dev->gadget.speed = USB_SPEED_UNKNOWN;
 425
 426         /* prevent new request submissions, kill any outstanding requests  */
 427         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 428                 struct s3c_ep *ep = &dev->ep[i];
 429                 ep->stopped = 1;
 430                 nuke(ep, -ESHUTDOWN);
 431         }
 432
 433         /* report disconnect; the driver is already quiesced */
 434         if (driver) {
 435                 spin_unlock(&dev->lock);
 436                 driver->disconnect(&dev->gadget);
 437                 spin_lock(&dev->lock);
 438         }
 439
 440         /* re-init driver-visible data structures */
 441         udc_reinit(dev);
 442 }
 443
 444 static void reconfig_usbd(void)
 445 {
 446         /* 2. Soft-reset OTG Core and then unreset again. */
 447         int i;
 448         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 449
 450         debug("Reseting OTG controller\n");
 451
 452         writel(0<<15            /* PHY Low Power Clock sel*/
 453                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 454                 |0x5<<10        /* Turnaround time*/
 455                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 456                                 /* 1:SRP enable] H1= 1,1*/
 457                 |0<<7           /* Ulpi DDR sel*/
 458                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 459                 |0<<4           /* 0: utmi+, 1:ulpi*/
 460                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 461                 |0x7<<0,        /* HS/FS Timeout**/
 462                 &reg->gusbcfg);
 463
 464         /* 3. Put the OTG device core in the disconnected state.*/
 465         uTemp = readl(&reg->dctl);
 466         uTemp |= SOFT_DISCONNECT;
 467         writel(uTemp, &reg->dctl);
 468
 469         udelay(20);
 470
 471         /* 4. Make the OTG device core exit from the disconnected state.*/
 472         uTemp = readl(&reg->dctl);
 473         uTemp = uTemp & ~SOFT_DISCONNECT;
 474         writel(uTemp, &reg->dctl);
 475
 476         /* 5. Configure OTG Core to initial settings of device mode.*/
 477         /* [][1: full speed(30Mhz) 0:high speed]*/
 478         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 479
 480         mdelay(1);
 481
 482         /* 6. Unmask the core interrupts*/
 483         writel(GINTMSK_INIT, &reg->gintmsk);
 484
 485         /* 7. Set NAK bit of EP0, EP1, EP2*/
 486         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 487         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 488
 489         for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
 490                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 491                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 492         }
 493
 494         /* 8. Unmask EPO interrupts*/
 495         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 496                | (1 << EP0_CON), &reg->daintmsk);
 497
 498         /* 9. Unmask device OUT EP common interrupts*/
 499         writel(DOEPMSK_INIT, &reg->doepmsk);
 500
 501         /* 10. Unmask device IN EP common interrupts*/
 502         writel(DIEPMSK_INIT, &reg->diepmsk);
 503
 504         /* 11. Set Rx FIFO Size (in 32-bit words) */
 505         writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);
 506
 507         /* 12. Set Non Periodic Tx FIFO Size */
 508         writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0,
 509                &reg->gnptxfsiz);
 510
 511         for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
 512                 writel((PTX_FIFO_SIZE >> 2) << 16 |
 513                        ((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
 514                          PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
 515                        &reg->dieptxf[i-1]);
 516
 517         /* Flush the RX FIFO */
 518         writel(RX_FIFO_FLUSH, &reg->grstctl);
 519         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 520                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 521
 522         /* Flush all the Tx FIFO's */
 523         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 524         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 525         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 526                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 527
 528         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 529         /* For Slave mode*/
 530         /* EP0: Control OUT */
 531         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 532                &reg->out_endp[EP0_CON].doepctl);
 533
 534         /* 14. Initialize OTG Link Core.*/
 535         writel(GAHBCFG_INIT, &reg->gahbcfg);
 536 }
 537
 538 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
 539 {
 540         unsigned int ep_ctrl;
 541         int i;
 542
 543         if (speed == USB_SPEED_HIGH) {
 544                 ep0_fifo_size = 64;
 545                 ep_fifo_size = 512;
 546                 ep_fifo_size2 = 1024;
 547                 dev->gadget.speed = USB_SPEED_HIGH;
 548         } else {
 549                 ep0_fifo_size = 64;
 550                 ep_fifo_size = 64;
 551                 ep_fifo_size2 = 64;
 552                 dev->gadget.speed = USB_SPEED_FULL;
 553         }
 554
 555         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 556         for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
 557                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 558
 559         /* EP0 - Control IN (64 bytes)*/
 560         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 561         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 562
 563         /* EP0 - Control OUT (64 bytes)*/
 564         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 565         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 566 }
 567
 568 static int s3c_ep_enable(struct usb_ep *_ep,
 569                          const struct usb_endpoint_descriptor *desc)
 570 {
 571         struct s3c_ep *ep;
 572         struct s3c_udc *dev;
 573         unsigned long flags;
 574
 575         debug("%s: %p\n", __func__, _ep);
 576
 577         ep = container_of(_ep, struct s3c_ep, ep);
 578         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 579             || desc->bDescriptorType != USB_DT_ENDPOINT
 580             || ep->bEndpointAddress != desc->bEndpointAddress
 581             || ep_maxpacket(ep) <
 582             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 583
 584                 debug("%s: bad ep or descriptor\n", __func__);
 585                 return -EINVAL;
 586         }
 587
 588         /* xfer types must match, except that interrupt ~= bulk */
 589         if (ep->bmAttributes != desc->bmAttributes
 590             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 591             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 592
 593                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 594                 return -EINVAL;
 595         }
 596
 597         /* hardware _could_ do smaller, but driver doesn't */
 598         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 599              && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
 600              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 601
 602                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 603                 return -ERANGE;
 604         }
 605
 606         dev = ep->dev;
 607         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 608
 609                 debug("%s: bogus device state\n", __func__);
 610                 return -ESHUTDOWN;
 611         }
 612
 613         ep->stopped = 0;
 614         ep->desc = desc;
 615         ep->pio_irqs = 0;
 616         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 617
 618         /* Reset halt state */
 619         s3c_udc_set_nak(ep);
 620         s3c_udc_set_halt(_ep, 0);
 621
 622         spin_lock_irqsave(&ep->dev->lock, flags);
 623         s3c_udc_ep_activate(ep);
 624         spin_unlock_irqrestore(&ep->dev->lock, flags);
 625
 626         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 627               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 628         return 0;
 629 }
 630
 631 /*
 632  * Disable EP
 633  */
 634 static int s3c_ep_disable(struct usb_ep *_ep)
 635 {
 636         struct s3c_ep *ep;
 637         unsigned long flags;
 638
 639         debug("%s: %p\n", __func__, _ep);
 640
 641         ep = container_of(_ep, struct s3c_ep, ep);
 642         if (!_ep || !ep->desc) {
 643                 debug("%s: %s not enabled\n", __func__,
 644                       _ep ? ep->ep.name : NULL);
 645                 return -EINVAL;
 646         }
 647
 648         spin_lock_irqsave(&ep->dev->lock, flags);
 649
 650         /* Nuke all pending requests */
 651         nuke(ep, -ESHUTDOWN);
 652
 653         ep->desc = 0;
 654         ep->stopped = 1;
 655
 656         spin_unlock_irqrestore(&ep->dev->lock, flags);
 657
 658         debug("%s: disabled %s\n", __func__, _ep->name);
 659         return 0;
 660 }
 661
 662 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 663                                              gfp_t gfp_flags)
 664 {
 665         struct s3c_request *req;
 666
 667         debug("%s: %s %p\n", __func__, ep->name, ep);
 668
 669         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 670         if (!req)
 671                 return 0;
 672
 673         memset(req, 0, sizeof *req);
 674         INIT_LIST_HEAD(&req->queue);
 675
 676         return &req->req;
 677 }
 678
 679 static void s3c_free_request(struct usb_ep *ep, struct usb_request *_req)
 680 {
 681         struct s3c_request *req;
 682
 683         debug("%s: %p\n", __func__, ep);
 684
 685         req = container_of(_req, struct s3c_request, req);
 686         WARN_ON(!list_empty(&req->queue));
 687         kfree(req);
 688 }
 689
 690 /* dequeue JUST ONE request */
 691 static int s3c_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 692 {
 693         struct s3c_ep *ep;
 694         struct s3c_request *req;
 695         unsigned long flags;
 696
 697         debug("%s: %p\n", __func__, _ep);
 698
 699         ep = container_of(_ep, struct s3c_ep, ep);
 700         if (!_ep || ep->ep.name == ep0name)
 701                 return -EINVAL;
 702
 703         spin_lock_irqsave(&ep->dev->lock, flags);
 704
 705         /* make sure it's actually queued on this endpoint */
 706         list_for_each_entry(req, &ep->queue, queue) {
 707                 if (&req->req == _req)
 708                         break;
 709         }
 710         if (&req->req != _req) {
 711                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 712                 return -EINVAL;
 713         }
 714
 715         done(ep, req, -ECONNRESET);
 716
 717         spin_unlock_irqrestore(&ep->dev->lock, flags);
 718         return 0;
 719 }
 720
 721 /*
 722  * Return bytes in EP FIFO
 723  */
 724 static int s3c_fifo_status(struct usb_ep *_ep)
 725 {
 726         int count = 0;
 727         struct s3c_ep *ep;
 728
 729         ep = container_of(_ep, struct s3c_ep, ep);
 730         if (!_ep) {
 731                 debug("%s: bad ep\n", __func__);
 732                 return -ENODEV;
 733         }
 734
 735         debug("%s: %d\n", __func__, ep_index(ep));
 736
 737         /* LPD can't report unclaimed bytes from IN fifos */
 738         if (ep_is_in(ep))
 739                 return -EOPNOTSUPP;
 740
 741         return count;
 742 }
 743
 744 /*
 745  * Flush EP FIFO
 746  */
 747 static void s3c_fifo_flush(struct usb_ep *_ep)
 748 {
 749         struct s3c_ep *ep;
 750
 751         ep = container_of(_ep, struct s3c_ep, ep);
 752         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 753                 debug("%s: bad ep\n", __func__);
 754                 return;
 755         }
 756
 757         debug("%s: %d\n", __func__, ep_index(ep));
 758 }
 759
 760 static const struct usb_gadget_ops s3c_udc_ops = {
 761         /* current versions must always be self-powered */
 762 };
 763
 764 static struct s3c_udc memory = {
 765         .usb_address = 0,
 766         .gadget = {
 767                 .ops = &s3c_udc_ops,
 768                 .ep0 = &memory.ep[0].ep,
 769                 .name = driver_name,
 770         },
 771
 772         /* control endpoint */
 773         .ep[0] = {
 774                 .ep = {
 775                         .name = ep0name,
 776                         .ops = &s3c_ep_ops,
 777                         .maxpacket = EP0_FIFO_SIZE,
 778                 },
 779                 .dev = &memory,
 780
 781                 .bEndpointAddress = 0,
 782                 .bmAttributes = 0,
 783
 784                 .ep_type = ep_control,
 785         },
 786
 787         /* first group of endpoints */
 788         .ep[1] = {
 789                 .ep = {
 790                         .name = "ep1in-bulk",
 791                         .ops = &s3c_ep_ops,
 792                         .maxpacket = EP_FIFO_SIZE,
 793                 },
 794                 .dev = &memory,
 795
 796                 .bEndpointAddress = USB_DIR_IN | 1,
 797                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 798
 799                 .ep_type = ep_bulk_out,
 800                 .fifo_num = 1,
 801         },
 802
 803         .ep[2] = {
 804                 .ep = {
 805                         .name = "ep2out-bulk",
 806                         .ops = &s3c_ep_ops,
 807                         .maxpacket = EP_FIFO_SIZE,
 808                 },
 809                 .dev = &memory,
 810
 811                 .bEndpointAddress = USB_DIR_OUT | 2,
 812                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 813
 814                 .ep_type = ep_bulk_in,
 815                 .fifo_num = 2,
 816         },
 817
 818         .ep[3] = {
 819                 .ep = {
 820                         .name = "ep3in-int",
 821                         .ops = &s3c_ep_ops,
 822                         .maxpacket = EP_FIFO_SIZE,
 823                 },
 824                 .dev = &memory,
 825
 826                 .bEndpointAddress = USB_DIR_IN | 3,
 827                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 828
 829                 .ep_type = ep_interrupt,
 830                 .fifo_num = 3,
 831         },
 832 };
 833
 834 /*
 835  *      probe - binds to the platform device
 836  */
 837
 838 int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
 839 {
 840         struct s3c_udc *dev = &memory;
 841         int retval = 0, i;
 842
 843         debug("%s: %p\n", __func__, pdata);
 844
 845         dev->pdata = pdata;
 846
 847         phy = (struct s3c_usbotg_phy *)pdata->regs_phy;
 848         reg = (struct s3c_usbotg_reg *)pdata->regs_otg;
 849         usb_phy_ctrl = pdata->usb_phy_ctrl;
 850
 851         /* regs_otg = (void *)pdata->regs_otg; */
 852
 853         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 854         dev->gadget.is_otg = 0;
 855         dev->gadget.is_a_peripheral = 0;
 856         dev->gadget.b_hnp_enable = 0;
 857         dev->gadget.a_hnp_support = 0;
 858         dev->gadget.a_alt_hnp_support = 0;
 859
 860         the_controller = dev;
 861
 862         for (i = 0; i < S3C_MAX_ENDPOINTS+1; i++) {
 863                 dev->dma_buf[i] = memalign(CONFIG_SYS_CACHELINE_SIZE,
 864                                            DMA_BUFFER_SIZE);
 865                 dev->dma_addr[i] = (dma_addr_t) dev->dma_buf[i];
 866                 invalidate_dcache_range((unsigned long) dev->dma_buf[i],
 867                                         (unsigned long) (dev->dma_buf[i]
 868                                                          + DMA_BUFFER_SIZE));
 869         }
 870         usb_ctrl = dev->dma_buf[0];
 871         usb_ctrl_dma_addr = dev->dma_addr[0];
 872
 873         udc_reinit(dev);
 874
 875         return retval;
 876 }
 877
 878 int usb_gadget_handle_interrupts()
 879 {
 880         u32 intr_status = readl(&reg->gintsts);
 881         u32 gintmsk = readl(&reg->gintmsk);
 882
 883         if (intr_status & gintmsk)
 884                 return s3c_udc_irq(1, (void *)the_controller);
 885         return 0;
 886 }