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         if (s5p_cpu_id == 0x4412)
 171                 writel((readl(&phy->phyclk) & ~(EXYNOS4X12_ID_PULLUP0 |
 172                         EXYNOS4X12_COMMON_ON_N0)) | EXYNOS4X12_CLK_SEL_24MHZ,
 173                        &phy->phyclk); /* PLL 24Mhz */
 174         else
 175                 writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)) |
 176                        CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
 177
 178         writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
 179                | PHY_SW_RST0, &phy->rstcon);
 180         udelay(10);
 181         writel(readl(&phy->rstcon)
 182                &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
 183         udelay(10);
 184 }
 185
 186 void otg_phy_off(struct s3c_udc *dev)
 187 {
 188         /* reset controller just in case */
 189         writel(PHY_SW_RST0, &phy->rstcon);
 190         udelay(20);
 191         writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
 192         udelay(20);
 193
 194         writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
 195                | FORCE_SUSPEND_0, &phy->phypwr);
 196
 197         writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
 198
 199         writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
 200               &phy->phyclk);
 201
 202         udelay(10000);
 203
 204         dev->pdata->phy_control(0);
 205 }
 206
 207 /***********************************************************/
 208
 209 #include "s3c_udc_otg_xfer_dma.c"
 210
 211 /*
 212  *      udc_disable - disable USB device controller
 213  */
 214 static void udc_disable(struct s3c_udc *dev)
 215 {
 216         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 217
 218         udc_set_address(dev, 0);
 219
 220         dev->ep0state = WAIT_FOR_SETUP;
 221         dev->gadget.speed = USB_SPEED_UNKNOWN;
 222         dev->usb_address = 0;
 223
 224         otg_phy_off(dev);
 225 }
 226
 227 /*
 228  *      udc_reinit - initialize software state
 229  */
 230 static void udc_reinit(struct s3c_udc *dev)
 231 {
 232         unsigned int i;
 233
 234         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 235
 236         /* device/ep0 records init */
 237         INIT_LIST_HEAD(&dev->gadget.ep_list);
 238         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 239         dev->ep0state = WAIT_FOR_SETUP;
 240
 241         /* basic endpoint records init */
 242         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 243                 struct s3c_ep *ep = &dev->ep[i];
 244
 245                 if (i != 0)
 246                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 247
 248                 ep->desc = 0;
 249                 ep->stopped = 0;
 250                 INIT_LIST_HEAD(&ep->queue);
 251                 ep->pio_irqs = 0;
 252         }
 253
 254         /* the rest was statically initialized, and is read-only */
 255 }
 256
 257 #define BYTES2MAXP(x)   (x / 8)
 258 #define MAXP2BYTES(x)   (x * 8)
 259
 260 /* until it's enabled, this UDC should be completely invisible
 261  * to any USB host.
 262  */
 263 static int udc_enable(struct s3c_udc *dev)
 264 {
 265         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 266
 267         otg_phy_init(dev);
 268         reconfig_usbd();
 269
 270         debug_cond(DEBUG_SETUP != 0,
 271                    "S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 272                     readl(&reg->gintmsk));
 273
 274         dev->gadget.speed = USB_SPEED_UNKNOWN;
 275
 276         return 0;
 277 }
 278
 279 /*
 280   Register entry point for the peripheral controller driver.
 281 */
 282 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 283 {
 284         struct s3c_udc *dev = the_controller;
 285         int retval = 0;
 286         unsigned long flags;
 287
 288         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 289
 290         if (!driver
 291             || (driver->speed != USB_SPEED_FULL
 292                 && driver->speed != USB_SPEED_HIGH)
 293             || !driver->bind || !driver->disconnect || !driver->setup)
 294                 return -EINVAL;
 295         if (!dev)
 296                 return -ENODEV;
 297         if (dev->driver)
 298                 return -EBUSY;
 299
 300         spin_lock_irqsave(&dev->lock, flags);
 301         /* first hook up the driver ... */
 302         dev->driver = driver;
 303         spin_unlock_irqrestore(&dev->lock, flags);
 304
 305         if (retval) { /* TODO */
 306                 printf("target device_add failed, error %d\n", retval);
 307                 return retval;
 308         }
 309
 310         retval = driver->bind(&dev->gadget);
 311         if (retval) {
 312                 debug_cond(DEBUG_SETUP != 0,
 313                            "%s: bind to driver --> error %d\n",
 314                             dev->gadget.name, retval);
 315                 dev->driver = 0;
 316                 return retval;
 317         }
 318
 319         enable_irq(IRQ_OTG);
 320
 321         debug_cond(DEBUG_SETUP != 0,
 322                    "Registered gadget driver %s\n", dev->gadget.name);
 323         udc_enable(dev);
 324
 325         return 0;
 326 }
 327
 328 /*
 329  * Unregister entry point for the peripheral controller driver.
 330  */
 331 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 332 {
 333         struct s3c_udc *dev = the_controller;
 334         unsigned long flags;
 335
 336         if (!dev)
 337                 return -ENODEV;
 338         if (!driver || driver != dev->driver)
 339                 return -EINVAL;
 340
 341         spin_lock_irqsave(&dev->lock, flags);
 342         dev->driver = 0;
 343         stop_activity(dev, driver);
 344         spin_unlock_irqrestore(&dev->lock, flags);
 345
 346         driver->unbind(&dev->gadget);
 347
 348         disable_irq(IRQ_OTG);
 349
 350         udc_disable(dev);
 351         return 0;
 352 }
 353
 354 /*
 355  *      done - retire a request; caller blocked irqs
 356  */
 357 static void done(struct s3c_ep *ep, struct s3c_request *req, int status)
 358 {
 359         unsigned int stopped = ep->stopped;
 360
 361         debug("%s: %s %p, req = %p, stopped = %d\n",
 362               __func__, ep->ep.name, ep, &req->req, stopped);
 363
 364         list_del_init(&req->queue);
 365
 366         if (likely(req->req.status == -EINPROGRESS))
 367                 req->req.status = status;
 368         else
 369                 status = req->req.status;
 370
 371         if (status && status != -ESHUTDOWN) {
 372                 debug("complete %s req %p stat %d len %u/%u\n",
 373                       ep->ep.name, &req->req, status,
 374                       req->req.actual, req->req.length);
 375         }
 376
 377         /* don't modify queue heads during completion callback */
 378         ep->stopped = 1;
 379
 380 #ifdef DEBUG
 381         printf("calling complete callback\n");
 382         {
 383                 int i, len = req->req.length;
 384
 385                 printf("pkt[%d] = ", req->req.length);
 386                 if (len > 64)
 387                         len = 64;
 388                 for (i = 0; i < len; i++) {
 389                         printf("%02x", ((u8 *)req->req.buf)[i]);
 390                         if ((i & 7) == 7)
 391                                 printf(" ");
 392                 }
 393                 printf("\n");
 394         }
 395 #endif
 396         spin_unlock(&ep->dev->lock);
 397         req->req.complete(&ep->ep, &req->req);
 398         spin_lock(&ep->dev->lock);
 399
 400         debug("callback completed\n");
 401
 402         ep->stopped = stopped;
 403 }
 404
 405 /*
 406  *      nuke - dequeue ALL requests
 407  */
 408 static void nuke(struct s3c_ep *ep, int status)
 409 {
 410         struct s3c_request *req;
 411
 412         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 413
 414         /* called with irqs blocked */
 415         while (!list_empty(&ep->queue)) {
 416                 req = list_entry(ep->queue.next, struct s3c_request, queue);
 417                 done(ep, req, status);
 418         }
 419 }
 420
 421 static void stop_activity(struct s3c_udc *dev,
 422                           struct usb_gadget_driver *driver)
 423 {
 424         int i;
 425
 426         /* don't disconnect drivers more than once */
 427         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 428                 driver = 0;
 429         dev->gadget.speed = USB_SPEED_UNKNOWN;
 430
 431         /* prevent new request submissions, kill any outstanding requests  */
 432         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 433                 struct s3c_ep *ep = &dev->ep[i];
 434                 ep->stopped = 1;
 435                 nuke(ep, -ESHUTDOWN);
 436         }
 437
 438         /* report disconnect; the driver is already quiesced */
 439         if (driver) {
 440                 spin_unlock(&dev->lock);
 441                 driver->disconnect(&dev->gadget);
 442                 spin_lock(&dev->lock);
 443         }
 444
 445         /* re-init driver-visible data structures */
 446         udc_reinit(dev);
 447 }
 448
 449 static void reconfig_usbd(void)
 450 {
 451         /* 2. Soft-reset OTG Core and then unreset again. */
 452         int i;
 453         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 454
 455         debug("Reseting OTG controller\n");
 456
 457         writel(0<<15            /* PHY Low Power Clock sel*/
 458                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 459                 |0x5<<10        /* Turnaround time*/
 460                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 461                                 /* 1:SRP enable] H1= 1,1*/
 462                 |0<<7           /* Ulpi DDR sel*/
 463                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 464                 |0<<4           /* 0: utmi+, 1:ulpi*/
 465                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 466                 |0x7<<0,        /* HS/FS Timeout**/
 467                 &reg->gusbcfg);
 468
 469         /* 3. Put the OTG device core in the disconnected state.*/
 470         uTemp = readl(&reg->dctl);
 471         uTemp |= SOFT_DISCONNECT;
 472         writel(uTemp, &reg->dctl);
 473
 474         udelay(20);
 475
 476         /* 4. Make the OTG device core exit from the disconnected state.*/
 477         uTemp = readl(&reg->dctl);
 478         uTemp = uTemp & ~SOFT_DISCONNECT;
 479         writel(uTemp, &reg->dctl);
 480
 481         /* 5. Configure OTG Core to initial settings of device mode.*/
 482         /* [][1: full speed(30Mhz) 0:high speed]*/
 483         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 484
 485         mdelay(1);
 486
 487         /* 6. Unmask the core interrupts*/
 488         writel(GINTMSK_INIT, &reg->gintmsk);
 489
 490         /* 7. Set NAK bit of EP0, EP1, EP2*/
 491         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 492         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 493
 494         for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
 495                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 496                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 497         }
 498
 499         /* 8. Unmask EPO interrupts*/
 500         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 501                | (1 << EP0_CON), &reg->daintmsk);
 502
 503         /* 9. Unmask device OUT EP common interrupts*/
 504         writel(DOEPMSK_INIT, &reg->doepmsk);
 505
 506         /* 10. Unmask device IN EP common interrupts*/
 507         writel(DIEPMSK_INIT, &reg->diepmsk);
 508
 509         /* 11. Set Rx FIFO Size (in 32-bit words) */
 510         writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);
 511
 512         /* 12. Set Non Periodic Tx FIFO Size */
 513         writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0,
 514                &reg->gnptxfsiz);
 515
 516         for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
 517                 writel((PTX_FIFO_SIZE >> 2) << 16 |
 518                        ((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
 519                          PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
 520                        &reg->dieptxf[i-1]);
 521
 522         /* Flush the RX FIFO */
 523         writel(RX_FIFO_FLUSH, &reg->grstctl);
 524         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 525                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 526
 527         /* Flush all the Tx FIFO's */
 528         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 529         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 530         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 531                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 532
 533         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 534         /* For Slave mode*/
 535         /* EP0: Control OUT */
 536         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 537                &reg->out_endp[EP0_CON].doepctl);
 538
 539         /* 14. Initialize OTG Link Core.*/
 540         writel(GAHBCFG_INIT, &reg->gahbcfg);
 541 }
 542
 543 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
 544 {
 545         unsigned int ep_ctrl;
 546         int i;
 547
 548         if (speed == USB_SPEED_HIGH) {
 549                 ep0_fifo_size = 64;
 550                 ep_fifo_size = 512;
 551                 ep_fifo_size2 = 1024;
 552                 dev->gadget.speed = USB_SPEED_HIGH;
 553         } else {
 554                 ep0_fifo_size = 64;
 555                 ep_fifo_size = 64;
 556                 ep_fifo_size2 = 64;
 557                 dev->gadget.speed = USB_SPEED_FULL;
 558         }
 559
 560         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 561         for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
 562                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 563
 564         /* EP0 - Control IN (64 bytes)*/
 565         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 566         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 567
 568         /* EP0 - Control OUT (64 bytes)*/
 569         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 570         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 571 }
 572
 573 static int s3c_ep_enable(struct usb_ep *_ep,
 574                          const struct usb_endpoint_descriptor *desc)
 575 {
 576         struct s3c_ep *ep;
 577         struct s3c_udc *dev;
 578         unsigned long flags;
 579
 580         debug("%s: %p\n", __func__, _ep);
 581
 582         ep = container_of(_ep, struct s3c_ep, ep);
 583         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 584             || desc->bDescriptorType != USB_DT_ENDPOINT
 585             || ep->bEndpointAddress != desc->bEndpointAddress
 586             || ep_maxpacket(ep) <
 587             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 588
 589                 debug("%s: bad ep or descriptor\n", __func__);
 590                 return -EINVAL;
 591         }
 592
 593         /* xfer types must match, except that interrupt ~= bulk */
 594         if (ep->bmAttributes != desc->bmAttributes
 595             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 596             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 597
 598                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 599                 return -EINVAL;
 600         }
 601
 602         /* hardware _could_ do smaller, but driver doesn't */
 603         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 604              && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
 605              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 606
 607                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 608                 return -ERANGE;
 609         }
 610
 611         dev = ep->dev;
 612         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 613
 614                 debug("%s: bogus device state\n", __func__);
 615                 return -ESHUTDOWN;
 616         }
 617
 618         ep->stopped = 0;
 619         ep->desc = desc;
 620         ep->pio_irqs = 0;
 621         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 622
 623         /* Reset halt state */
 624         s3c_udc_set_nak(ep);
 625         s3c_udc_set_halt(_ep, 0);
 626
 627         spin_lock_irqsave(&ep->dev->lock, flags);
 628         s3c_udc_ep_activate(ep);
 629         spin_unlock_irqrestore(&ep->dev->lock, flags);
 630
 631         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 632               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 633         return 0;
 634 }
 635
 636 /*
 637  * Disable EP
 638  */
 639 static int s3c_ep_disable(struct usb_ep *_ep)
 640 {
 641         struct s3c_ep *ep;
 642         unsigned long flags;
 643
 644         debug("%s: %p\n", __func__, _ep);
 645
 646         ep = container_of(_ep, struct s3c_ep, ep);
 647         if (!_ep || !ep->desc) {
 648                 debug("%s: %s not enabled\n", __func__,
 649                       _ep ? ep->ep.name : NULL);
 650                 return -EINVAL;
 651         }
 652
 653         spin_lock_irqsave(&ep->dev->lock, flags);
 654
 655         /* Nuke all pending requests */
 656         nuke(ep, -ESHUTDOWN);
 657
 658         ep->desc = 0;
 659         ep->stopped = 1;
 660
 661         spin_unlock_irqrestore(&ep->dev->lock, flags);
 662
 663         debug("%s: disabled %s\n", __func__, _ep->name);
 664         return 0;
 665 }
 666
 667 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 668                                              gfp_t gfp_flags)
 669 {
 670         struct s3c_request *req;
 671
 672         debug("%s: %s %p\n", __func__, ep->name, ep);
 673
 674         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 675         if (!req)
 676                 return 0;
 677
 678         memset(req, 0, sizeof *req);
 679         INIT_LIST_HEAD(&req->queue);
 680
 681         return &req->req;
 682 }
 683
 684 static void s3c_free_request(struct usb_ep *ep, struct usb_request *_req)
 685 {
 686         struct s3c_request *req;
 687
 688         debug("%s: %p\n", __func__, ep);
 689
 690         req = container_of(_req, struct s3c_request, req);
 691         WARN_ON(!list_empty(&req->queue));
 692         kfree(req);
 693 }
 694
 695 /* dequeue JUST ONE request */
 696 static int s3c_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 697 {
 698         struct s3c_ep *ep;
 699         struct s3c_request *req;
 700         unsigned long flags;
 701
 702         debug("%s: %p\n", __func__, _ep);
 703
 704         ep = container_of(_ep, struct s3c_ep, ep);
 705         if (!_ep || ep->ep.name == ep0name)
 706                 return -EINVAL;
 707
 708         spin_lock_irqsave(&ep->dev->lock, flags);
 709
 710         /* make sure it's actually queued on this endpoint */
 711         list_for_each_entry(req, &ep->queue, queue) {
 712                 if (&req->req == _req)
 713                         break;
 714         }
 715         if (&req->req != _req) {
 716                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 717                 return -EINVAL;
 718         }
 719
 720         done(ep, req, -ECONNRESET);
 721
 722         spin_unlock_irqrestore(&ep->dev->lock, flags);
 723         return 0;
 724 }
 725
 726 /*
 727  * Return bytes in EP FIFO
 728  */
 729 static int s3c_fifo_status(struct usb_ep *_ep)
 730 {
 731         int count = 0;
 732         struct s3c_ep *ep;
 733
 734         ep = container_of(_ep, struct s3c_ep, ep);
 735         if (!_ep) {
 736                 debug("%s: bad ep\n", __func__);
 737                 return -ENODEV;
 738         }
 739
 740         debug("%s: %d\n", __func__, ep_index(ep));
 741
 742         /* LPD can't report unclaimed bytes from IN fifos */
 743         if (ep_is_in(ep))
 744                 return -EOPNOTSUPP;
 745
 746         return count;
 747 }
 748
 749 /*
 750  * Flush EP FIFO
 751  */
 752 static void s3c_fifo_flush(struct usb_ep *_ep)
 753 {
 754         struct s3c_ep *ep;
 755
 756         ep = container_of(_ep, struct s3c_ep, ep);
 757         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 758                 debug("%s: bad ep\n", __func__);
 759                 return;
 760         }
 761
 762         debug("%s: %d\n", __func__, ep_index(ep));
 763 }
 764
 765 static const struct usb_gadget_ops s3c_udc_ops = {
 766         /* current versions must always be self-powered */
 767 };
 768
 769 static struct s3c_udc memory = {
 770         .usb_address = 0,
 771         .gadget = {
 772                 .ops = &s3c_udc_ops,
 773                 .ep0 = &memory.ep[0].ep,
 774                 .name = driver_name,
 775         },
 776
 777         /* control endpoint */
 778         .ep[0] = {
 779                 .ep = {
 780                         .name = ep0name,
 781                         .ops = &s3c_ep_ops,
 782                         .maxpacket = EP0_FIFO_SIZE,
 783                 },
 784                 .dev = &memory,
 785
 786                 .bEndpointAddress = 0,
 787                 .bmAttributes = 0,
 788
 789                 .ep_type = ep_control,
 790         },
 791
 792         /* first group of endpoints */
 793         .ep[1] = {
 794                 .ep = {
 795                         .name = "ep1in-bulk",
 796                         .ops = &s3c_ep_ops,
 797                         .maxpacket = EP_FIFO_SIZE,
 798                 },
 799                 .dev = &memory,
 800
 801                 .bEndpointAddress = USB_DIR_IN | 1,
 802                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 803
 804                 .ep_type = ep_bulk_out,
 805                 .fifo_num = 1,
 806         },
 807
 808         .ep[2] = {
 809                 .ep = {
 810                         .name = "ep2out-bulk",
 811                         .ops = &s3c_ep_ops,
 812                         .maxpacket = EP_FIFO_SIZE,
 813                 },
 814                 .dev = &memory,
 815
 816                 .bEndpointAddress = USB_DIR_OUT | 2,
 817                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 818
 819                 .ep_type = ep_bulk_in,
 820                 .fifo_num = 2,
 821         },
 822
 823         .ep[3] = {
 824                 .ep = {
 825                         .name = "ep3in-int",
 826                         .ops = &s3c_ep_ops,
 827                         .maxpacket = EP_FIFO_SIZE,
 828                 },
 829                 .dev = &memory,
 830
 831                 .bEndpointAddress = USB_DIR_IN | 3,
 832                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 833
 834                 .ep_type = ep_interrupt,
 835                 .fifo_num = 3,
 836         },
 837 };
 838
 839 /*
 840  *      probe - binds to the platform device
 841  */
 842
 843 int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
 844 {
 845         struct s3c_udc *dev = &memory;
 846         int retval = 0, i;
 847
 848         debug("%s: %p\n", __func__, pdata);
 849
 850         dev->pdata = pdata;
 851
 852         phy = (struct s3c_usbotg_phy *)pdata->regs_phy;
 853         reg = (struct s3c_usbotg_reg *)pdata->regs_otg;
 854         usb_phy_ctrl = pdata->usb_phy_ctrl;
 855
 856         /* regs_otg = (void *)pdata->regs_otg; */
 857
 858         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 859         dev->gadget.is_otg = 0;
 860         dev->gadget.is_a_peripheral = 0;
 861         dev->gadget.b_hnp_enable = 0;
 862         dev->gadget.a_hnp_support = 0;
 863         dev->gadget.a_alt_hnp_support = 0;
 864
 865         the_controller = dev;
 866
 867         for (i = 0; i < S3C_MAX_ENDPOINTS+1; i++) {
 868                 dev->dma_buf[i] = memalign(CONFIG_SYS_CACHELINE_SIZE,
 869                                            DMA_BUFFER_SIZE);
 870                 dev->dma_addr[i] = (dma_addr_t) dev->dma_buf[i];
 871                 invalidate_dcache_range((unsigned long) dev->dma_buf[i],
 872                                         (unsigned long) (dev->dma_buf[i]
 873                                                          + DMA_BUFFER_SIZE));
 874         }
 875         usb_ctrl = dev->dma_buf[0];
 876         usb_ctrl_dma_addr = dev->dma_addr[0];
 877
 878         udc_reinit(dev);
 879
 880         return retval;
 881 }
 882
 883 int usb_gadget_handle_interrupts()
 884 {
 885         u32 intr_status = readl(&reg->gintsts);
 886         u32 gintmsk = readl(&reg->gintmsk);
 887
 888         if (intr_status & gintmsk)
 889                 return s3c_udc_irq(1, (void *)the_controller);
 890         return 0;
 891 }