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  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2 of the License, or
  21  * (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  31  *
  32  */
  33 #undef DEBUG
  34 #include <common.h>
  35 #include <asm/errno.h>
  36 #include <linux/list.h>
  37 #include <malloc.h>
  38
  39 #include <linux/usb/ch9.h>
  40 #include <linux/usb/gadget.h>
  41
  42 #include <asm/byteorder.h>
  43 #include <asm/unaligned.h>
  44 #include <asm/io.h>
  45
  46 #include <asm/mach-types.h>
  47 #include <asm/arch/gpio.h>
  48
  49 #include "regs-otg.h"
  50 #include <usb/lin_gadget_compat.h>
  51
  52 /***********************************************************/
  53
  54 #define OTG_DMA_MODE            1
  55
  56 #define DEBUG_SETUP 0
  57 #define DEBUG_EP0 0
  58 #define DEBUG_ISR 0
  59 #define DEBUG_OUT_EP 0
  60 #define DEBUG_IN_EP 0
  61
  62 #include <usb/s3c_udc.h>
  63
  64 #define EP0_CON         0
  65 #define EP_MASK         0xF
  66
  67 static char *state_names[] = {
  68         "WAIT_FOR_SETUP",
  69         "DATA_STATE_XMIT",
  70         "DATA_STATE_NEED_ZLP",
  71         "WAIT_FOR_OUT_STATUS",
  72         "DATA_STATE_RECV",
  73         "WAIT_FOR_COMPLETE",
  74         "WAIT_FOR_OUT_COMPLETE",
  75         "WAIT_FOR_IN_COMPLETE",
  76         "WAIT_FOR_NULL_COMPLETE",
  77 };
  78
  79 #define DRIVER_DESC "S3C HS USB OTG Device Driver, (c) Samsung Electronics"
  80 #define DRIVER_VERSION "15 March 2009"
  81
  82 struct s3c_udc  *the_controller;
  83
  84 static const char driver_name[] = "s3c-udc";
  85 static const char driver_desc[] = DRIVER_DESC;
  86 static const char ep0name[] = "ep0-control";
  87
  88 /* Max packet size*/
  89 static unsigned int ep0_fifo_size = 64;
  90 static unsigned int ep_fifo_size =  512;
  91 static unsigned int ep_fifo_size2 = 1024;
  92 static int reset_available = 1;
  93
  94 static struct usb_ctrlrequest *usb_ctrl;
  95 static dma_addr_t usb_ctrl_dma_addr;
  96
  97 /*
  98   Local declarations.
  99 */
 100 static int s3c_ep_enable(struct usb_ep *ep,
 101                          const struct usb_endpoint_descriptor *);
 102 static int s3c_ep_disable(struct usb_ep *ep);
 103 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 104                                              gfp_t gfp_flags);
 105 static void s3c_free_request(struct usb_ep *ep, struct usb_request *);
 106
 107 static int s3c_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
 108 static int s3c_dequeue(struct usb_ep *ep, struct usb_request *);
 109 static int s3c_fifo_status(struct usb_ep *ep);
 110 static void s3c_fifo_flush(struct usb_ep *ep);
 111 static void s3c_ep0_read(struct s3c_udc *dev);
 112 static void s3c_ep0_kick(struct s3c_udc *dev, struct s3c_ep *ep);
 113 static void s3c_handle_ep0(struct s3c_udc *dev);
 114 static int s3c_ep0_write(struct s3c_udc *dev);
 115 static int write_fifo_ep0(struct s3c_ep *ep, struct s3c_request *req);
 116 static void done(struct s3c_ep *ep, struct s3c_request *req, int status);
 117 static void stop_activity(struct s3c_udc *dev,
 118                           struct usb_gadget_driver *driver);
 119 static int udc_enable(struct s3c_udc *dev);
 120 static void udc_set_address(struct s3c_udc *dev, unsigned char address);
 121 static void reconfig_usbd(void);
 122 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed);
 123 static void nuke(struct s3c_ep *ep, int status);
 124 static int s3c_udc_set_halt(struct usb_ep *_ep, int value);
 125 static void s3c_udc_set_nak(struct s3c_ep *ep);
 126
 127 void set_udc_gadget_private_data(void *p)
 128 {
 129         debug_cond(DEBUG_SETUP != 0,
 130                    "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 131                    the_controller, p);
 132         the_controller->gadget.dev.device_data = p;
 133 }
 134
 135 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 136 {
 137         return gadget->dev.device_data;
 138 }
 139
 140 static struct usb_ep_ops s3c_ep_ops = {
 141         .enable = s3c_ep_enable,
 142         .disable = s3c_ep_disable,
 143
 144         .alloc_request = s3c_alloc_request,
 145         .free_request = s3c_free_request,
 146
 147         .queue = s3c_queue,
 148         .dequeue = s3c_dequeue,
 149
 150         .set_halt = s3c_udc_set_halt,
 151         .fifo_status = s3c_fifo_status,
 152         .fifo_flush = s3c_fifo_flush,
 153 };
 154
 155 #define create_proc_files() do {} while (0)
 156 #define remove_proc_files() do {} while (0)
 157
 158 /***********************************************************/
 159
 160 void __iomem            *regs_otg;
 161 struct s3c_usbotg_reg *reg;
 162 struct s3c_usbotg_phy *phy;
 163 static unsigned int usb_phy_ctrl;
 164
 165 void otg_phy_init(struct s3c_udc *dev)
 166 {
 167         dev->pdata->phy_control(1);
 168
 169         /*USB PHY0 Enable */
 170         printf("USB PHY0 Enable\n");
 171
 172         /* Enable PHY */
 173         writel(readl(usb_phy_ctrl) | USB_PHY_CTRL_EN0, usb_phy_ctrl);
 174
 175         if (dev->pdata->usb_flags == PHY0_SLEEP) /* C210 Universal */
 176                 writel((readl(&phy->phypwr)
 177                         &~(PHY_0_SLEEP | OTG_DISABLE_0 | ANALOG_PWRDOWN)
 178                         &~FORCE_SUSPEND_0), &phy->phypwr);
 179         else /* C110 GONI */
 180                 writel((readl(&phy->phypwr) &~(OTG_DISABLE_0 | ANALOG_PWRDOWN)
 181                         &~FORCE_SUSPEND_0), &phy->phypwr);
 182
 183         writel((readl(&phy->phyclk) &~(ID_PULLUP0 | COMMON_ON_N0)) |
 184                CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
 185
 186         writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
 187                | PHY_SW_RST0, &phy->rstcon);
 188         udelay(10);
 189         writel(readl(&phy->rstcon)
 190                &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
 191         udelay(10);
 192 }
 193
 194 void otg_phy_off(struct s3c_udc *dev)
 195 {
 196         /* reset controller just in case */
 197         writel(PHY_SW_RST0, &phy->rstcon);
 198         udelay(20);
 199         writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
 200         udelay(20);
 201
 202         writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
 203                | FORCE_SUSPEND_0, &phy->phypwr);
 204
 205         writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
 206
 207         writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
 208               &phy->phyclk);
 209
 210         udelay(10000);
 211
 212         dev->pdata->phy_control(0);
 213 }
 214
 215 /***********************************************************/
 216
 217 #include "s3c_udc_otg_xfer_dma.c"
 218
 219 /*
 220  *      udc_disable - disable USB device controller
 221  */
 222 static void udc_disable(struct s3c_udc *dev)
 223 {
 224         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 225
 226         udc_set_address(dev, 0);
 227
 228         dev->ep0state = WAIT_FOR_SETUP;
 229         dev->gadget.speed = USB_SPEED_UNKNOWN;
 230         dev->usb_address = 0;
 231
 232         otg_phy_off(dev);
 233 }
 234
 235 /*
 236  *      udc_reinit - initialize software state
 237  */
 238 static void udc_reinit(struct s3c_udc *dev)
 239 {
 240         unsigned int i;
 241
 242         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 243
 244         /* device/ep0 records init */
 245         INIT_LIST_HEAD(&dev->gadget.ep_list);
 246         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 247         dev->ep0state = WAIT_FOR_SETUP;
 248
 249         /* basic endpoint records init */
 250         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 251                 struct s3c_ep *ep = &dev->ep[i];
 252
 253                 if (i != 0)
 254                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 255
 256                 ep->desc = 0;
 257                 ep->stopped = 0;
 258                 INIT_LIST_HEAD(&ep->queue);
 259                 ep->pio_irqs = 0;
 260         }
 261
 262         /* the rest was statically initialized, and is read-only */
 263 }
 264
 265 #define BYTES2MAXP(x)   (x / 8)
 266 #define MAXP2BYTES(x)   (x * 8)
 267
 268 /* until it's enabled, this UDC should be completely invisible
 269  * to any USB host.
 270  */
 271 static int udc_enable(struct s3c_udc *dev)
 272 {
 273         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 274
 275         otg_phy_init(dev);
 276         reconfig_usbd();
 277
 278         debug_cond(DEBUG_SETUP != 0,
 279                    "S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 280                     readl(&reg->gintmsk));
 281
 282         dev->gadget.speed = USB_SPEED_UNKNOWN;
 283
 284         return 0;
 285 }
 286
 287 /*
 288   Register entry point for the peripheral controller driver.
 289 */
 290 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 291 {
 292         struct s3c_udc *dev = the_controller;
 293         int retval = 0;
 294         unsigned long flags;
 295
 296         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 297
 298         if (!driver
 299             || (driver->speed != USB_SPEED_FULL
 300                 && driver->speed != USB_SPEED_HIGH)
 301             || !driver->bind || !driver->disconnect || !driver->setup)
 302                 return -EINVAL;
 303         if (!dev)
 304                 return -ENODEV;
 305         if (dev->driver)
 306                 return -EBUSY;
 307
 308         spin_lock_irqsave(&dev->lock, flags);
 309         /* first hook up the driver ... */
 310         dev->driver = driver;
 311         spin_unlock_irqrestore(&dev->lock, flags);
 312
 313         if (retval) { /* TODO */
 314                 printf("target device_add failed, error %d\n", retval);
 315                 return retval;
 316         }
 317
 318         retval = driver->bind(&dev->gadget);
 319         if (retval) {
 320                 debug_cond(DEBUG_SETUP != 0,
 321                            "%s: bind to driver --> error %d\n",
 322                             dev->gadget.name, retval);
 323                 dev->driver = 0;
 324                 return retval;
 325         }
 326
 327         enable_irq(IRQ_OTG);
 328
 329         debug_cond(DEBUG_SETUP != 0,
 330                    "Registered gadget driver %s\n", dev->gadget.name);
 331         udc_enable(dev);
 332
 333         return 0;
 334 }
 335
 336 /*
 337  * Unregister entry point for the peripheral controller driver.
 338  */
 339 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 340 {
 341         struct s3c_udc *dev = the_controller;
 342         unsigned long flags;
 343
 344         if (!dev)
 345                 return -ENODEV;
 346         if (!driver || driver != dev->driver)
 347                 return -EINVAL;
 348
 349         spin_lock_irqsave(&dev->lock, flags);
 350         dev->driver = 0;
 351         stop_activity(dev, driver);
 352         spin_unlock_irqrestore(&dev->lock, flags);
 353
 354         driver->unbind(&dev->gadget);
 355
 356         disable_irq(IRQ_OTG);
 357
 358         udc_disable(dev);
 359         return 0;
 360 }
 361
 362 /*
 363  *      done - retire a request; caller blocked irqs
 364  */
 365 static void done(struct s3c_ep *ep, struct s3c_request *req, int status)
 366 {
 367         unsigned int stopped = ep->stopped;
 368
 369         debug("%s: %s %p, req = %p, stopped = %d\n",
 370               __func__, ep->ep.name, ep, &req->req, stopped);
 371
 372         list_del_init(&req->queue);
 373
 374         if (likely(req->req.status == -EINPROGRESS))
 375                 req->req.status = status;
 376         else
 377                 status = req->req.status;
 378
 379         if (status && status != -ESHUTDOWN) {
 380                 debug("complete %s req %p stat %d len %u/%u\n",
 381                       ep->ep.name, &req->req, status,
 382                       req->req.actual, req->req.length);
 383         }
 384
 385         /* don't modify queue heads during completion callback */
 386         ep->stopped = 1;
 387
 388 #ifdef DEBUG
 389         printf("calling complete callback\n");
 390         {
 391                 int i, len = req->req.length;
 392
 393                 printf("pkt[%d] = ", req->req.length);
 394                 if (len > 64)
 395                         len = 64;
 396                 for (i = 0; i < len; i++) {
 397                         printf("%02x", ((u8 *)req->req.buf)[i]);
 398                         if ((i & 7) == 7)
 399                                 printf(" ");
 400                 }
 401                 printf("\n");
 402         }
 403 #endif
 404         spin_unlock(&ep->dev->lock);
 405         req->req.complete(&ep->ep, &req->req);
 406         spin_lock(&ep->dev->lock);
 407
 408         debug("callback completed\n");
 409
 410         ep->stopped = stopped;
 411 }
 412
 413 /*
 414  *      nuke - dequeue ALL requests
 415  */
 416 static void nuke(struct s3c_ep *ep, int status)
 417 {
 418         struct s3c_request *req;
 419
 420         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 421
 422         /* called with irqs blocked */
 423         while (!list_empty(&ep->queue)) {
 424                 req = list_entry(ep->queue.next, struct s3c_request, queue);
 425                 done(ep, req, status);
 426         }
 427 }
 428
 429 static void stop_activity(struct s3c_udc *dev,
 430                           struct usb_gadget_driver *driver)
 431 {
 432         int i;
 433
 434         /* don't disconnect drivers more than once */
 435         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 436                 driver = 0;
 437         dev->gadget.speed = USB_SPEED_UNKNOWN;
 438
 439         /* prevent new request submissions, kill any outstanding requests  */
 440         for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 441                 struct s3c_ep *ep = &dev->ep[i];
 442                 ep->stopped = 1;
 443                 nuke(ep, -ESHUTDOWN);
 444         }
 445
 446         /* report disconnect; the driver is already quiesced */
 447         if (driver) {
 448                 spin_unlock(&dev->lock);
 449                 driver->disconnect(&dev->gadget);
 450                 spin_lock(&dev->lock);
 451         }
 452
 453         /* re-init driver-visible data structures */
 454         udc_reinit(dev);
 455 }
 456
 457 static void reconfig_usbd(void)
 458 {
 459         /* 2. Soft-reset OTG Core and then unreset again. */
 460         int i;
 461         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 462
 463         debug("Reseting OTG controller\n");
 464
 465         writel(0<<15            /* PHY Low Power Clock sel*/
 466                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 467                 |0x5<<10        /* Turnaround time*/
 468                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 469                                 /* 1:SRP enable] H1= 1,1*/
 470                 |0<<7           /* Ulpi DDR sel*/
 471                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 472                 |0<<4           /* 0: utmi+, 1:ulpi*/
 473                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 474                 |0x7<<0,        /* HS/FS Timeout**/
 475                 &reg->gusbcfg);
 476
 477         /* 3. Put the OTG device core in the disconnected state.*/
 478         uTemp = readl(&reg->dctl);
 479         uTemp |= SOFT_DISCONNECT;
 480         writel(uTemp, &reg->dctl);
 481
 482         udelay(20);
 483
 484         /* 4. Make the OTG device core exit from the disconnected state.*/
 485         uTemp = readl(&reg->dctl);
 486         uTemp = uTemp & ~SOFT_DISCONNECT;
 487         writel(uTemp, &reg->dctl);
 488
 489         /* 5. Configure OTG Core to initial settings of device mode.*/
 490         /* [][1: full speed(30Mhz) 0:high speed]*/
 491         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 492
 493         mdelay(1);
 494
 495         /* 6. Unmask the core interrupts*/
 496         writel(GINTMSK_INIT, &reg->gintmsk);
 497
 498         /* 7. Set NAK bit of EP0, EP1, EP2*/
 499         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 500         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 501
 502         for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
 503                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 504                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 505         }
 506
 507         /* 8. Unmask EPO interrupts*/
 508         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 509                | (1 << EP0_CON), &reg->daintmsk);
 510
 511         /* 9. Unmask device OUT EP common interrupts*/
 512         writel(DOEPMSK_INIT, &reg->doepmsk);
 513
 514         /* 10. Unmask device IN EP common interrupts*/
 515         writel(DIEPMSK_INIT, &reg->diepmsk);
 516
 517         /* 11. Set Rx FIFO Size (in 32-bit words) */
 518         writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);
 519
 520         /* 12. Set Non Periodic Tx FIFO Size */
 521         writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0,
 522                &reg->gnptxfsiz);
 523
 524         for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
 525                 writel((PTX_FIFO_SIZE >> 2) << 16 |
 526                        ((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
 527                          PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
 528                        &reg->dieptxf[i-1]);
 529
 530         /* Flush the RX FIFO */
 531         writel(RX_FIFO_FLUSH, &reg->grstctl);
 532         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 533                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 534
 535         /* Flush all the Tx FIFO's */
 536         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 537         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 538         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 539                 debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);
 540
 541         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 542         /* For Slave mode*/
 543         /* EP0: Control OUT */
 544         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 545                &reg->out_endp[EP0_CON].doepctl);
 546
 547         /* 14. Initialize OTG Link Core.*/
 548         writel(GAHBCFG_INIT, &reg->gahbcfg);
 549 }
 550
 551 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
 552 {
 553         unsigned int ep_ctrl;
 554         int i;
 555
 556         if (speed == USB_SPEED_HIGH) {
 557                 ep0_fifo_size = 64;
 558                 ep_fifo_size = 512;
 559                 ep_fifo_size2 = 1024;
 560                 dev->gadget.speed = USB_SPEED_HIGH;
 561         } else {
 562                 ep0_fifo_size = 64;
 563                 ep_fifo_size = 64;
 564                 ep_fifo_size2 = 64;
 565                 dev->gadget.speed = USB_SPEED_FULL;
 566         }
 567
 568         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 569         for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
 570                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 571
 572         /* EP0 - Control IN (64 bytes)*/
 573         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 574         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 575
 576         /* EP0 - Control OUT (64 bytes)*/
 577         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 578         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 579 }
 580
 581 static int s3c_ep_enable(struct usb_ep *_ep,
 582                          const struct usb_endpoint_descriptor *desc)
 583 {
 584         struct s3c_ep *ep;
 585         struct s3c_udc *dev;
 586         unsigned long flags;
 587
 588         debug("%s: %p\n", __func__, _ep);
 589
 590         ep = container_of(_ep, struct s3c_ep, ep);
 591         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 592             || desc->bDescriptorType != USB_DT_ENDPOINT
 593             || ep->bEndpointAddress != desc->bEndpointAddress
 594             || ep_maxpacket(ep) <
 595             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 596
 597                 debug("%s: bad ep or descriptor\n", __func__);
 598                 return -EINVAL;
 599         }
 600
 601         /* xfer types must match, except that interrupt ~= bulk */
 602         if (ep->bmAttributes != desc->bmAttributes
 603             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 604             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 605
 606                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 607                 return -EINVAL;
 608         }
 609
 610         /* hardware _could_ do smaller, but driver doesn't */
 611         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 612              && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
 613              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 614
 615                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 616                 return -ERANGE;
 617         }
 618
 619         dev = ep->dev;
 620         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 621
 622                 debug("%s: bogus device state\n", __func__);
 623                 return -ESHUTDOWN;
 624         }
 625
 626         ep->stopped = 0;
 627         ep->desc = desc;
 628         ep->pio_irqs = 0;
 629         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 630
 631         /* Reset halt state */
 632         s3c_udc_set_nak(ep);
 633         s3c_udc_set_halt(_ep, 0);
 634
 635         spin_lock_irqsave(&ep->dev->lock, flags);
 636         s3c_udc_ep_activate(ep);
 637         spin_unlock_irqrestore(&ep->dev->lock, flags);
 638
 639         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 640               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 641         return 0;
 642 }
 643
 644 /*
 645  * Disable EP
 646  */
 647 static int s3c_ep_disable(struct usb_ep *_ep)
 648 {
 649         struct s3c_ep *ep;
 650         unsigned long flags;
 651
 652         debug("%s: %p\n", __func__, _ep);
 653
 654         ep = container_of(_ep, struct s3c_ep, ep);
 655         if (!_ep || !ep->desc) {
 656                 debug("%s: %s not enabled\n", __func__,
 657                       _ep ? ep->ep.name : NULL);
 658                 return -EINVAL;
 659         }
 660
 661         spin_lock_irqsave(&ep->dev->lock, flags);
 662
 663         /* Nuke all pending requests */
 664         nuke(ep, -ESHUTDOWN);
 665
 666         ep->desc = 0;
 667         ep->stopped = 1;
 668
 669         spin_unlock_irqrestore(&ep->dev->lock, flags);
 670
 671         debug("%s: disabled %s\n", __func__, _ep->name);
 672         return 0;
 673 }
 674
 675 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 676                                              gfp_t gfp_flags)
 677 {
 678         struct s3c_request *req;
 679
 680         debug("%s: %s %p\n", __func__, ep->name, ep);
 681
 682         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 683         if (!req)
 684                 return 0;
 685
 686         memset(req, 0, sizeof *req);
 687         INIT_LIST_HEAD(&req->queue);
 688
 689         return &req->req;
 690 }
 691
 692 static void s3c_free_request(struct usb_ep *ep, struct usb_request *_req)
 693 {
 694         struct s3c_request *req;
 695
 696         debug("%s: %p\n", __func__, ep);
 697
 698         req = container_of(_req, struct s3c_request, req);
 699         WARN_ON(!list_empty(&req->queue));
 700         kfree(req);
 701 }
 702
 703 /* dequeue JUST ONE request */
 704 static int s3c_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 705 {
 706         struct s3c_ep *ep;
 707         struct s3c_request *req;
 708         unsigned long flags;
 709
 710         debug("%s: %p\n", __func__, _ep);
 711
 712         ep = container_of(_ep, struct s3c_ep, ep);
 713         if (!_ep || ep->ep.name == ep0name)
 714                 return -EINVAL;
 715
 716         spin_lock_irqsave(&ep->dev->lock, flags);
 717
 718         /* make sure it's actually queued on this endpoint */
 719         list_for_each_entry(req, &ep->queue, queue) {
 720                 if (&req->req == _req)
 721                         break;
 722         }
 723         if (&req->req != _req) {
 724                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 725                 return -EINVAL;
 726         }
 727
 728         done(ep, req, -ECONNRESET);
 729
 730         spin_unlock_irqrestore(&ep->dev->lock, flags);
 731         return 0;
 732 }
 733
 734 /*
 735  * Return bytes in EP FIFO
 736  */
 737 static int s3c_fifo_status(struct usb_ep *_ep)
 738 {
 739         int count = 0;
 740         struct s3c_ep *ep;
 741
 742         ep = container_of(_ep, struct s3c_ep, ep);
 743         if (!_ep) {
 744                 debug("%s: bad ep\n", __func__);
 745                 return -ENODEV;
 746         }
 747
 748         debug("%s: %d\n", __func__, ep_index(ep));
 749
 750         /* LPD can't report unclaimed bytes from IN fifos */
 751         if (ep_is_in(ep))
 752                 return -EOPNOTSUPP;
 753
 754         return count;
 755 }
 756
 757 /*
 758  * Flush EP FIFO
 759  */
 760 static void s3c_fifo_flush(struct usb_ep *_ep)
 761 {
 762         struct s3c_ep *ep;
 763
 764         ep = container_of(_ep, struct s3c_ep, ep);
 765         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 766                 debug("%s: bad ep\n", __func__);
 767                 return;
 768         }
 769
 770         debug("%s: %d\n", __func__, ep_index(ep));
 771 }
 772
 773 static const struct usb_gadget_ops s3c_udc_ops = {
 774         /* current versions must always be self-powered */
 775 };
 776
 777 static struct s3c_udc memory = {
 778         .usb_address = 0,
 779         .gadget = {
 780                 .ops = &s3c_udc_ops,
 781                 .ep0 = &memory.ep[0].ep,
 782                 .name = driver_name,
 783         },
 784
 785         /* control endpoint */
 786         .ep[0] = {
 787                 .ep = {
 788                         .name = ep0name,
 789                         .ops = &s3c_ep_ops,
 790                         .maxpacket = EP0_FIFO_SIZE,
 791                 },
 792                 .dev = &memory,
 793
 794                 .bEndpointAddress = 0,
 795                 .bmAttributes = 0,
 796
 797                 .ep_type = ep_control,
 798         },
 799
 800         /* first group of endpoints */
 801         .ep[1] = {
 802                 .ep = {
 803                         .name = "ep1in-bulk",
 804                         .ops = &s3c_ep_ops,
 805                         .maxpacket = EP_FIFO_SIZE,
 806                 },
 807                 .dev = &memory,
 808
 809                 .bEndpointAddress = USB_DIR_IN | 1,
 810                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 811
 812                 .ep_type = ep_bulk_out,
 813                 .fifo_num = 1,
 814         },
 815
 816         .ep[2] = {
 817                 .ep = {
 818                         .name = "ep2out-bulk",
 819                         .ops = &s3c_ep_ops,
 820                         .maxpacket = EP_FIFO_SIZE,
 821                 },
 822                 .dev = &memory,
 823
 824                 .bEndpointAddress = USB_DIR_OUT | 2,
 825                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 826
 827                 .ep_type = ep_bulk_in,
 828                 .fifo_num = 2,
 829         },
 830
 831         .ep[3] = {
 832                 .ep = {
 833                         .name = "ep3in-int",
 834                         .ops = &s3c_ep_ops,
 835                         .maxpacket = EP_FIFO_SIZE,
 836                 },
 837                 .dev = &memory,
 838
 839                 .bEndpointAddress = USB_DIR_IN | 3,
 840                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 841
 842                 .ep_type = ep_interrupt,
 843                 .fifo_num = 3,
 844         },
 845 };
 846
 847 /*
 848  *      probe - binds to the platform device
 849  */
 850
 851 int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
 852 {
 853         struct s3c_udc *dev = &memory;
 854         int retval = 0, i;
 855
 856         debug("%s: %p\n", __func__, pdata);
 857
 858         dev->pdata = pdata;
 859
 860         phy = (struct s3c_usbotg_phy *)pdata->regs_phy;
 861         reg = (struct s3c_usbotg_reg *)pdata->regs_otg;
 862         usb_phy_ctrl = pdata->usb_phy_ctrl;
 863
 864         /* regs_otg = (void *)pdata->regs_otg; */
 865
 866         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 867         dev->gadget.is_otg = 0;
 868         dev->gadget.is_a_peripheral = 0;
 869         dev->gadget.b_hnp_enable = 0;
 870         dev->gadget.a_hnp_support = 0;
 871         dev->gadget.a_alt_hnp_support = 0;
 872
 873         the_controller = dev;
 874
 875         for (i = 0; i < S3C_MAX_ENDPOINTS+1; i++) {
 876                 dev->dma_buf[i] = memalign(CONFIG_SYS_CACHELINE_SIZE,
 877                                            DMA_BUFFER_SIZE);
 878                 dev->dma_addr[i] = (dma_addr_t) dev->dma_buf[i];
 879                 invalidate_dcache_range((unsigned long) dev->dma_buf[i],
 880                                         (unsigned long) (dev->dma_buf[i]
 881                                                          + DMA_BUFFER_SIZE));
 882         }
 883         usb_ctrl = dev->dma_buf[0];
 884         usb_ctrl_dma_addr = dev->dma_addr[0];
 885
 886         udc_reinit(dev);
 887
 888         return retval;
 889 }
 890
 891 int usb_gadget_handle_interrupts()
 892 {
 893         u32 intr_status = readl(&reg->gintsts);
 894         u32 gintmsk = readl(&reg->gintmsk);
 895
 896         if (intr_status & gintmsk)
 897                 return s3c_udc_irq(1, (void *)the_controller);
 898         return 0;
 899 }