drivers/usb/gadget/lh7a40x_udc.c

   1 /*
   2  * linux/drivers/usb/gadget/lh7a40x_udc.c
   3  * Sharp LH7A40x on-chip full speed USB device controllers
   4  *
   5  * Copyright (C) 2004 Mikko Lahteenmaki, Nordic ID
   6  * Copyright (C) 2004 Bo Henriksen, Nordic ID
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/platform_device.h>
  25
  26 #include "lh7a40x_udc.h"
  27
  28 //#define DEBUG printk
  29 //#define DEBUG_EP0 printk
  30 //#define DEBUG_SETUP printk
  31
  32 #ifndef DEBUG_EP0
  33 # define DEBUG_EP0(fmt,args...)
  34 #endif
  35 #ifndef DEBUG_SETUP
  36 # define DEBUG_SETUP(fmt,args...)
  37 #endif
  38 #ifndef DEBUG
  39 # define NO_STATES
  40 # define DEBUG(fmt,args...)
  41 #endif
  42
  43 #define DRIVER_DESC                     "LH7A40x USB Device Controller"
  44 #define DRIVER_VERSION          __DATE__
  45
  46 #ifndef _BIT                    /* FIXME - what happended to _BIT in 2.6.7bk18? */
  47 #define _BIT(x) (1<<(x))
  48 #endif
  49
  50 struct lh7a40x_udc *the_controller;
  51
  52 static const char driver_name[] = "lh7a40x_udc";
  53 static const char driver_desc[] = DRIVER_DESC;
  54 static const char ep0name[] = "ep0-control";
  55
  56 /*
  57   Local definintions.
  58 */
  59
  60 #ifndef NO_STATES
  61 static char *state_names[] = {
  62         "WAIT_FOR_SETUP",
  63         "DATA_STATE_XMIT",
  64         "DATA_STATE_NEED_ZLP",
  65         "WAIT_FOR_OUT_STATUS",
  66         "DATA_STATE_RECV"
  67 };
  68 #endif
  69
  70 /*
  71   Local declarations.
  72 */
  73 static int lh7a40x_ep_enable(struct usb_ep *ep,
  74                              const struct usb_endpoint_descriptor *);
  75 static int lh7a40x_ep_disable(struct usb_ep *ep);
  76 static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep, gfp_t);
  77 static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *);
  78 static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned, dma_addr_t *,
  79                                   gfp_t);
  80 static void lh7a40x_free_buffer(struct usb_ep *ep, void *, dma_addr_t,
  81                                 unsigned);
  82 static int lh7a40x_queue(struct usb_ep *ep, struct usb_request *, gfp_t);
  83 static int lh7a40x_dequeue(struct usb_ep *ep, struct usb_request *);
  84 static int lh7a40x_set_halt(struct usb_ep *ep, int);
  85 static int lh7a40x_fifo_status(struct usb_ep *ep);
  86 static void lh7a40x_fifo_flush(struct usb_ep *ep);
  87 static void lh7a40x_ep0_kick(struct lh7a40x_udc *dev, struct lh7a40x_ep *ep);
  88 static void lh7a40x_handle_ep0(struct lh7a40x_udc *dev, u32 intr);
  89
  90 static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req,
  91                  int status);
  92 static void pio_irq_enable(int bEndpointAddress);
  93 static void pio_irq_disable(int bEndpointAddress);
  94 static void stop_activity(struct lh7a40x_udc *dev,
  95                           struct usb_gadget_driver *driver);
  96 static void flush(struct lh7a40x_ep *ep);
  97 static void udc_enable(struct lh7a40x_udc *dev);
  98 static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address);
  99
 100 static struct usb_ep_ops lh7a40x_ep_ops = {
 101         .enable = lh7a40x_ep_enable,
 102         .disable = lh7a40x_ep_disable,
 103
 104         .alloc_request = lh7a40x_alloc_request,
 105         .free_request = lh7a40x_free_request,
 106
 107         .alloc_buffer = lh7a40x_alloc_buffer,
 108         .free_buffer = lh7a40x_free_buffer,
 109
 110         .queue = lh7a40x_queue,
 111         .dequeue = lh7a40x_dequeue,
 112
 113         .set_halt = lh7a40x_set_halt,
 114         .fifo_status = lh7a40x_fifo_status,
 115         .fifo_flush = lh7a40x_fifo_flush,
 116 };
 117
 118 /* Inline code */
 119
 120 static __inline__ int write_packet(struct lh7a40x_ep *ep,
 121                                    struct lh7a40x_request *req, int max)
 122 {
 123         u8 *buf;
 124         int length, count;
 125         volatile u32 *fifo = (volatile u32 *)ep->fifo;
 126
 127         buf = req->req.buf + req->req.actual;
 128         prefetch(buf);
 129
 130         length = req->req.length - req->req.actual;
 131         length = min(length, max);
 132         req->req.actual += length;
 133
 134         DEBUG("Write %d (max %d), fifo %p\n", length, max, fifo);
 135
 136         count = length;
 137         while (count--) {
 138                 *fifo = *buf++;
 139         }
 140
 141         return length;
 142 }
 143
 144 static __inline__ void usb_set_index(u32 ep)
 145 {
 146         *(volatile u32 *)io_p2v(USB_INDEX) = ep;
 147 }
 148
 149 static __inline__ u32 usb_read(u32 port)
 150 {
 151         return *(volatile u32 *)io_p2v(port);
 152 }
 153
 154 static __inline__ void usb_write(u32 val, u32 port)
 155 {
 156         *(volatile u32 *)io_p2v(port) = val;
 157 }
 158
 159 static __inline__ void usb_set(u32 val, u32 port)
 160 {
 161         volatile u32 *ioport = (volatile u32 *)io_p2v(port);
 162         u32 after = (*ioport) | val;
 163         *ioport = after;
 164 }
 165
 166 static __inline__ void usb_clear(u32 val, u32 port)
 167 {
 168         volatile u32 *ioport = (volatile u32 *)io_p2v(port);
 169         u32 after = (*ioport) & ~val;
 170         *ioport = after;
 171 }
 172
 173 /*-------------------------------------------------------------------------*/
 174
 175 #define GPIO_PORTC_DR   (0x80000E08)
 176 #define GPIO_PORTC_DDR  (0x80000E18)
 177 #define GPIO_PORTC_PDR  (0x80000E70)
 178
 179 /* get port C pin data register */
 180 #define get_portc_pdr(bit)              ((usb_read(GPIO_PORTC_PDR) & _BIT(bit)) != 0)
 181 /* get port C data direction register */
 182 #define get_portc_ddr(bit)              ((usb_read(GPIO_PORTC_DDR) & _BIT(bit)) != 0)
 183 /* set port C data register */
 184 #define set_portc_dr(bit, val)  (val ? usb_set(_BIT(bit), GPIO_PORTC_DR) : usb_clear(_BIT(bit), GPIO_PORTC_DR))
 185 /* set port C data direction register */
 186 #define set_portc_ddr(bit, val) (val ? usb_set(_BIT(bit), GPIO_PORTC_DDR) : usb_clear(_BIT(bit), GPIO_PORTC_DDR))
 187
 188 /*
 189  * LPD7A404 GPIO's:
 190  * Port C bit 1 = USB Port 1 Power Enable
 191  * Port C bit 2 = USB Port 1 Data Carrier Detect
 192  */
 193 #define is_usb_connected()              get_portc_pdr(2)
 194
 195 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
 196
 197 static const char proc_node_name[] = "driver/udc";
 198
 199 static int
 200 udc_proc_read(char *page, char **start, off_t off, int count,
 201               int *eof, void *_dev)
 202 {
 203         char *buf = page;
 204         struct lh7a40x_udc *dev = _dev;
 205         char *next = buf;
 206         unsigned size = count;
 207         unsigned long flags;
 208         int t;
 209
 210         if (off != 0)
 211                 return 0;
 212
 213         local_irq_save(flags);
 214
 215         /* basic device status */
 216         t = scnprintf(next, size,
 217                       DRIVER_DESC "\n"
 218                       "%s version: %s\n"
 219                       "Gadget driver: %s\n"
 220                       "Host: %s\n\n",
 221                       driver_name, DRIVER_VERSION,
 222                       dev->driver ? dev->driver->driver.name : "(none)",
 223                       is_usb_connected()? "full speed" : "disconnected");
 224         size -= t;
 225         next += t;
 226
 227         t = scnprintf(next, size,
 228                       "GPIO:\n"
 229                       " Port C bit 1: %d, dir %d\n"
 230                       " Port C bit 2: %d, dir %d\n\n",
 231                       get_portc_pdr(1), get_portc_ddr(1),
 232                       get_portc_pdr(2), get_portc_ddr(2)
 233             );
 234         size -= t;
 235         next += t;
 236
 237         t = scnprintf(next, size,
 238                       "DCP pullup: %d\n\n",
 239                       (usb_read(USB_PM) & PM_USB_DCP) != 0);
 240         size -= t;
 241         next += t;
 242
 243         local_irq_restore(flags);
 244         *eof = 1;
 245         return count - size;
 246 }
 247
 248 #define create_proc_files()     create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
 249 #define remove_proc_files()     remove_proc_entry(proc_node_name, NULL)
 250
 251 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
 252
 253 #define create_proc_files() do {} while (0)
 254 #define remove_proc_files() do {} while (0)
 255
 256 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
 257
 258 /*
 259  *      udc_disable - disable USB device controller
 260  */
 261 static void udc_disable(struct lh7a40x_udc *dev)
 262 {
 263         DEBUG("%s, %p\n", __FUNCTION__, dev);
 264
 265         udc_set_address(dev, 0);
 266
 267         /* Disable interrupts */
 268         usb_write(0, USB_IN_INT_EN);
 269         usb_write(0, USB_OUT_INT_EN);
 270         usb_write(0, USB_INT_EN);
 271
 272         /* Disable the USB */
 273         usb_write(0, USB_PM);
 274
 275 #ifdef CONFIG_ARCH_LH7A404
 276         /* Disable USB power */
 277         set_portc_dr(1, 0);
 278 #endif
 279
 280         /* if hardware supports it, disconnect from usb */
 281         /* make_usb_disappear(); */
 282
 283         dev->ep0state = WAIT_FOR_SETUP;
 284         dev->gadget.speed = USB_SPEED_UNKNOWN;
 285         dev->usb_address = 0;
 286 }
 287
 288 /*
 289  *      udc_reinit - initialize software state
 290  */
 291 static void udc_reinit(struct lh7a40x_udc *dev)
 292 {
 293         u32 i;
 294
 295         DEBUG("%s, %p\n", __FUNCTION__, dev);
 296
 297         /* device/ep0 records init */
 298         INIT_LIST_HEAD(&dev->gadget.ep_list);
 299         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 300         dev->ep0state = WAIT_FOR_SETUP;
 301
 302         /* basic endpoint records init */
 303         for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
 304                 struct lh7a40x_ep *ep = &dev->ep[i];
 305
 306                 if (i != 0)
 307                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 308
 309                 ep->desc = 0;
 310                 ep->stopped = 0;
 311                 INIT_LIST_HEAD(&ep->queue);
 312                 ep->pio_irqs = 0;
 313         }
 314
 315         /* the rest was statically initialized, and is read-only */
 316 }
 317
 318 #define BYTES2MAXP(x)   (x / 8)
 319 #define MAXP2BYTES(x)   (x * 8)
 320
 321 /* until it's enabled, this UDC should be completely invisible
 322  * to any USB host.
 323  */
 324 static void udc_enable(struct lh7a40x_udc *dev)
 325 {
 326         int ep;
 327
 328         DEBUG("%s, %p\n", __FUNCTION__, dev);
 329
 330         dev->gadget.speed = USB_SPEED_UNKNOWN;
 331
 332 #ifdef CONFIG_ARCH_LH7A404
 333         /* Set Port C bit 1 & 2 as output */
 334         set_portc_ddr(1, 1);
 335         set_portc_ddr(2, 1);
 336
 337         /* Enable USB power */
 338         set_portc_dr(1, 0);
 339 #endif
 340
 341         /*
 342          * C.f Chapter 18.1.3.1 Initializing the USB
 343          */
 344
 345         /* Disable the USB */
 346         usb_clear(PM_USB_ENABLE, USB_PM);
 347
 348         /* Reset APB & I/O sides of the USB */
 349         usb_set(USB_RESET_APB | USB_RESET_IO, USB_RESET);
 350         mdelay(5);
 351         usb_clear(USB_RESET_APB | USB_RESET_IO, USB_RESET);
 352
 353         /* Set MAXP values for each */
 354         for (ep = 0; ep < UDC_MAX_ENDPOINTS; ep++) {
 355                 struct lh7a40x_ep *ep_reg = &dev->ep[ep];
 356                 u32 csr;
 357
 358                 usb_set_index(ep);
 359
 360                 switch (ep_reg->ep_type) {
 361                 case ep_bulk_in:
 362                 case ep_interrupt:
 363                         usb_clear(USB_IN_CSR2_USB_DMA_EN | USB_IN_CSR2_AUTO_SET,
 364                                   ep_reg->csr2);
 365                         /* Fall through */
 366                 case ep_control:
 367                         usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
 368                                   USB_IN_MAXP);
 369                         break;
 370                 case ep_bulk_out:
 371                         usb_clear(USB_OUT_CSR2_USB_DMA_EN |
 372                                   USB_OUT_CSR2_AUTO_CLR, ep_reg->csr2);
 373                         usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
 374                                   USB_OUT_MAXP);
 375                         break;
 376                 }
 377
 378                 /* Read & Write CSR1, just in case */
 379                 csr = usb_read(ep_reg->csr1);
 380                 usb_write(csr, ep_reg->csr1);
 381
 382                 flush(ep_reg);
 383         }
 384
 385         /* Disable interrupts */
 386         usb_write(0, USB_IN_INT_EN);
 387         usb_write(0, USB_OUT_INT_EN);
 388         usb_write(0, USB_INT_EN);
 389
 390         /* Enable interrupts */
 391         usb_set(USB_IN_INT_EP0, USB_IN_INT_EN);
 392         usb_set(USB_INT_RESET_INT | USB_INT_RESUME_INT, USB_INT_EN);
 393         /* Dont enable rest of the interrupts */
 394         /* usb_set(USB_IN_INT_EP3 | USB_IN_INT_EP1 | USB_IN_INT_EP0, USB_IN_INT_EN);
 395            usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN); */
 396
 397         /* Enable SUSPEND */
 398         usb_set(PM_ENABLE_SUSPEND, USB_PM);
 399
 400         /* Enable the USB */
 401         usb_set(PM_USB_ENABLE, USB_PM);
 402
 403 #ifdef CONFIG_ARCH_LH7A404
 404         /* NOTE: DOES NOT WORK! */
 405         /* Let host detect UDC:
 406          * Software must write a 0 to the PMR:DCP_CTRL bit to turn this
 407          * transistor on and pull the USBDP pin HIGH.
 408          */
 409         /* usb_clear(PM_USB_DCP, USB_PM);
 410            usb_set(PM_USB_DCP, USB_PM); */
 411 #endif
 412 }
 413
 414 /*
 415   Register entry point for the peripheral controller driver.
 416 */
 417 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 418 {
 419         struct lh7a40x_udc *dev = the_controller;
 420         int retval;
 421
 422         DEBUG("%s: %s\n", __FUNCTION__, driver->driver.name);
 423
 424         if (!driver
 425             || driver->speed != USB_SPEED_FULL
 426             || !driver->bind
 427             || !driver->unbind || !driver->disconnect || !driver->setup)
 428                 return -EINVAL;
 429         if (!dev)
 430                 return -ENODEV;
 431         if (dev->driver)
 432                 return -EBUSY;
 433
 434         /* first hook up the driver ... */
 435         dev->driver = driver;
 436         dev->gadget.dev.driver = &driver->driver;
 437
 438         device_add(&dev->gadget.dev);
 439         retval = driver->bind(&dev->gadget);
 440         if (retval) {
 441                 printk("%s: bind to driver %s --> error %d\n", dev->gadget.name,
 442                        driver->driver.name, retval);
 443                 device_del(&dev->gadget.dev);
 444
 445                 dev->driver = 0;
 446                 dev->gadget.dev.driver = 0;
 447                 return retval;
 448         }
 449
 450         /* ... then enable host detection and ep0; and we're ready
 451          * for set_configuration as well as eventual disconnect.
 452          * NOTE:  this shouldn't power up until later.
 453          */
 454         printk("%s: registered gadget driver '%s'\n", dev->gadget.name,
 455                driver->driver.name);
 456
 457         udc_enable(dev);
 458
 459         return 0;
 460 }
 461
 462 EXPORT_SYMBOL(usb_gadget_register_driver);
 463
 464 /*
 465   Unregister entry point for the peripheral controller driver.
 466 */
 467 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 468 {
 469         struct lh7a40x_udc *dev = the_controller;
 470         unsigned long flags;
 471
 472         if (!dev)
 473                 return -ENODEV;
 474         if (!driver || driver != dev->driver)
 475                 return -EINVAL;
 476
 477         spin_lock_irqsave(&dev->lock, flags);
 478         dev->driver = 0;
 479         stop_activity(dev, driver);
 480         spin_unlock_irqrestore(&dev->lock, flags);
 481
 482         driver->unbind(&dev->gadget);
 483         device_del(&dev->gadget.dev);
 484
 485         udc_disable(dev);
 486
 487         DEBUG("unregistered gadget driver '%s'\n", driver->driver.name);
 488         return 0;
 489 }
 490
 491 EXPORT_SYMBOL(usb_gadget_unregister_driver);
 492
 493 /*-------------------------------------------------------------------------*/
 494
 495 /** Write request to FIFO (max write == maxp size)
 496  *  Return:  0 = still running, 1 = completed, negative = errno
 497  *  NOTE: INDEX register must be set for EP
 498  */
 499 static int write_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
 500 {
 501         u32 max;
 502         u32 csr;
 503
 504         max = le16_to_cpu(ep->desc->wMaxPacketSize);
 505
 506         csr = usb_read(ep->csr1);
 507         DEBUG("CSR: %x %d\n", csr, csr & USB_IN_CSR1_FIFO_NOT_EMPTY);
 508
 509         if (!(csr & USB_IN_CSR1_FIFO_NOT_EMPTY)) {
 510                 unsigned count;
 511                 int is_last, is_short;
 512
 513                 count = write_packet(ep, req, max);
 514                 usb_set(USB_IN_CSR1_IN_PKT_RDY, ep->csr1);
 515
 516                 /* last packet is usually short (or a zlp) */
 517                 if (unlikely(count != max))
 518                         is_last = is_short = 1;
 519                 else {
 520                         if (likely(req->req.length != req->req.actual)
 521                             || req->req.zero)
 522                                 is_last = 0;
 523                         else
 524                                 is_last = 1;
 525                         /* interrupt/iso maxpacket may not fill the fifo */
 526                         is_short = unlikely(max < ep_maxpacket(ep));
 527                 }
 528
 529                 DEBUG("%s: wrote %s %d bytes%s%s %d left %p\n", __FUNCTION__,
 530                       ep->ep.name, count,
 531                       is_last ? "/L" : "", is_short ? "/S" : "",
 532                       req->req.length - req->req.actual, req);
 533
 534                 /* requests complete when all IN data is in the FIFO */
 535                 if (is_last) {
 536                         done(ep, req, 0);
 537                         if (list_empty(&ep->queue)) {
 538                                 pio_irq_disable(ep_index(ep));
 539                         }
 540                         return 1;
 541                 }
 542         } else {
 543                 DEBUG("Hmm.. %d ep FIFO is not empty!\n", ep_index(ep));
 544         }
 545
 546         return 0;
 547 }
 548
 549 /** Read to request from FIFO (max read == bytes in fifo)
 550  *  Return:  0 = still running, 1 = completed, negative = errno
 551  *  NOTE: INDEX register must be set for EP
 552  */
 553 static int read_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
 554 {
 555         u32 csr;
 556         u8 *buf;
 557         unsigned bufferspace, count, is_short;
 558         volatile u32 *fifo = (volatile u32 *)ep->fifo;
 559
 560         /* make sure there's a packet in the FIFO. */
 561         csr = usb_read(ep->csr1);
 562         if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY)) {
 563                 DEBUG("%s: Packet NOT ready!\n", __FUNCTION__);
 564                 return -EINVAL;
 565         }
 566
 567         buf = req->req.buf + req->req.actual;
 568         prefetchw(buf);
 569         bufferspace = req->req.length - req->req.actual;
 570
 571         /* read all bytes from this packet */
 572         count = usb_read(USB_OUT_FIFO_WC1);
 573         req->req.actual += min(count, bufferspace);
 574
 575         is_short = (count < ep->ep.maxpacket);
 576         DEBUG("read %s %02x, %d bytes%s req %p %d/%d\n",
 577               ep->ep.name, csr, count,
 578               is_short ? "/S" : "", req, req->req.actual, req->req.length);
 579
 580         while (likely(count-- != 0)) {
 581                 u8 byte = (u8) (*fifo & 0xff);
 582
 583                 if (unlikely(bufferspace == 0)) {
 584                         /* this happens when the driver's buffer
 585                          * is smaller than what the host sent.
 586                          * discard the extra data.
 587                          */
 588                         if (req->req.status != -EOVERFLOW)
 589                                 printk("%s overflow %d\n", ep->ep.name, count);
 590                         req->req.status = -EOVERFLOW;
 591                 } else {
 592                         *buf++ = byte;
 593                         bufferspace--;
 594                 }
 595         }
 596
 597         usb_clear(USB_OUT_CSR1_OUT_PKT_RDY, ep->csr1);
 598
 599         /* completion */
 600         if (is_short || req->req.actual == req->req.length) {
 601                 done(ep, req, 0);
 602                 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
 603
 604                 if (list_empty(&ep->queue))
 605                         pio_irq_disable(ep_index(ep));
 606                 return 1;
 607         }
 608
 609         /* finished that packet.  the next one may be waiting... */
 610         return 0;
 611 }
 612
 613 /*
 614  *      done - retire a request; caller blocked irqs
 615  *  INDEX register is preserved to keep same
 616  */
 617 static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req, int status)
 618 {
 619         unsigned int stopped = ep->stopped;
 620         u32 index;
 621
 622         DEBUG("%s, %p\n", __FUNCTION__, ep);
 623         list_del_init(&req->queue);
 624
 625         if (likely(req->req.status == -EINPROGRESS))
 626                 req->req.status = status;
 627         else
 628                 status = req->req.status;
 629
 630         if (status && status != -ESHUTDOWN)
 631                 DEBUG("complete %s req %p stat %d len %u/%u\n",
 632                       ep->ep.name, &req->req, status,
 633                       req->req.actual, req->req.length);
 634
 635         /* don't modify queue heads during completion callback */
 636         ep->stopped = 1;
 637         /* Read current index (completion may modify it) */
 638         index = usb_read(USB_INDEX);
 639
 640         spin_unlock(&ep->dev->lock);
 641         req->req.complete(&ep->ep, &req->req);
 642         spin_lock(&ep->dev->lock);
 643
 644         /* Restore index */
 645         usb_set_index(index);
 646         ep->stopped = stopped;
 647 }
 648
 649 /** Enable EP interrupt */
 650 static void pio_irq_enable(int ep)
 651 {
 652         DEBUG("%s: %d\n", __FUNCTION__, ep);
 653
 654         switch (ep) {
 655         case 1:
 656                 usb_set(USB_IN_INT_EP1, USB_IN_INT_EN);
 657                 break;
 658         case 2:
 659                 usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN);
 660                 break;
 661         case 3:
 662                 usb_set(USB_IN_INT_EP3, USB_IN_INT_EN);
 663                 break;
 664         default:
 665                 DEBUG("Unknown endpoint: %d\n", ep);
 666                 break;
 667         }
 668 }
 669
 670 /** Disable EP interrupt */
 671 static void pio_irq_disable(int ep)
 672 {
 673         DEBUG("%s: %d\n", __FUNCTION__, ep);
 674
 675         switch (ep) {
 676         case 1:
 677                 usb_clear(USB_IN_INT_EP1, USB_IN_INT_EN);
 678                 break;
 679         case 2:
 680                 usb_clear(USB_OUT_INT_EP2, USB_OUT_INT_EN);
 681                 break;
 682         case 3:
 683                 usb_clear(USB_IN_INT_EP3, USB_IN_INT_EN);
 684                 break;
 685         default:
 686                 DEBUG("Unknown endpoint: %d\n", ep);
 687                 break;
 688         }
 689 }
 690
 691 /*
 692  *      nuke - dequeue ALL requests
 693  */
 694 void nuke(struct lh7a40x_ep *ep, int status)
 695 {
 696         struct lh7a40x_request *req;
 697
 698         DEBUG("%s, %p\n", __FUNCTION__, ep);
 699
 700         /* Flush FIFO */
 701         flush(ep);
 702
 703         /* called with irqs blocked */
 704         while (!list_empty(&ep->queue)) {
 705                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
 706                 done(ep, req, status);
 707         }
 708
 709         /* Disable IRQ if EP is enabled (has descriptor) */
 710         if (ep->desc)
 711                 pio_irq_disable(ep_index(ep));
 712 }
 713
 714 /*
 715 void nuke_all(struct lh7a40x_udc *dev)
 716 {
 717         int n;
 718         for(n=0; n<UDC_MAX_ENDPOINTS; n++) {
 719                 struct lh7a40x_ep *ep = &dev->ep[n];
 720                 usb_set_index(n);
 721                 nuke(ep, 0);
 722         }
 723 }*/
 724
 725 /*
 726 static void flush_all(struct lh7a40x_udc *dev)
 727 {
 728         int n;
 729     for (n = 0; n < UDC_MAX_ENDPOINTS; n++)
 730     {
 731                 struct lh7a40x_ep *ep = &dev->ep[n];
 732                 flush(ep);
 733     }
 734 }
 735 */
 736
 737 /** Flush EP
 738  * NOTE: INDEX register must be set before this call
 739  */
 740 static void flush(struct lh7a40x_ep *ep)
 741 {
 742         DEBUG("%s, %p\n", __FUNCTION__, ep);
 743
 744         switch (ep->ep_type) {
 745         case ep_control:
 746                 /* check, by implication c.f. 15.1.2.11 */
 747                 break;
 748
 749         case ep_bulk_in:
 750         case ep_interrupt:
 751                 /* if(csr & USB_IN_CSR1_IN_PKT_RDY) */
 752                 usb_set(USB_IN_CSR1_FIFO_FLUSH, ep->csr1);
 753                 break;
 754
 755         case ep_bulk_out:
 756                 /* if(csr & USB_OUT_CSR1_OUT_PKT_RDY) */
 757                 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
 758                 break;
 759         }
 760 }
 761
 762 /**
 763  * lh7a40x_in_epn - handle IN interrupt
 764  */
 765 static void lh7a40x_in_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
 766 {
 767         u32 csr;
 768         struct lh7a40x_ep *ep = &dev->ep[ep_idx];
 769         struct lh7a40x_request *req;
 770
 771         usb_set_index(ep_idx);
 772
 773         csr = usb_read(ep->csr1);
 774         DEBUG("%s: %d, csr %x\n", __FUNCTION__, ep_idx, csr);
 775
 776         if (csr & USB_IN_CSR1_SENT_STALL) {
 777                 DEBUG("USB_IN_CSR1_SENT_STALL\n");
 778                 usb_set(USB_IN_CSR1_SENT_STALL /*|USB_IN_CSR1_SEND_STALL */ ,
 779                         ep->csr1);
 780                 return;
 781         }
 782
 783         if (!ep->desc) {
 784                 DEBUG("%s: NO EP DESC\n", __FUNCTION__);
 785                 return;
 786         }
 787
 788         if (list_empty(&ep->queue))
 789                 req = 0;
 790         else
 791                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
 792
 793         DEBUG("req: %p\n", req);
 794
 795         if (!req)
 796                 return;
 797
 798         write_fifo(ep, req);
 799 }
 800
 801 /* ********************************************************************************************* */
 802 /* Bulk OUT (recv)
 803  */
 804
 805 static void lh7a40x_out_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
 806 {
 807         struct lh7a40x_ep *ep = &dev->ep[ep_idx];
 808         struct lh7a40x_request *req;
 809
 810         DEBUG("%s: %d\n", __FUNCTION__, ep_idx);
 811
 812         usb_set_index(ep_idx);
 813
 814         if (ep->desc) {
 815                 u32 csr;
 816                 csr = usb_read(ep->csr1);
 817
 818                 while ((csr =
 819                         usb_read(ep->
 820                                  csr1)) & (USB_OUT_CSR1_OUT_PKT_RDY |
 821                                            USB_OUT_CSR1_SENT_STALL)) {
 822                         DEBUG("%s: %x\n", __FUNCTION__, csr);
 823
 824                         if (csr & USB_OUT_CSR1_SENT_STALL) {
 825                                 DEBUG("%s: stall sent, flush fifo\n",
 826                                       __FUNCTION__);
 827                                 /* usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1); */
 828                                 flush(ep);
 829                         } else if (csr & USB_OUT_CSR1_OUT_PKT_RDY) {
 830                                 if (list_empty(&ep->queue))
 831                                         req = 0;
 832                                 else
 833                                         req =
 834                                             list_entry(ep->queue.next,
 835                                                        struct lh7a40x_request,
 836                                                        queue);
 837
 838                                 if (!req) {
 839                                         printk("%s: NULL REQ %d\n",
 840                                                __FUNCTION__, ep_idx);
 841                                         flush(ep);
 842                                         break;
 843                                 } else {
 844                                         read_fifo(ep, req);
 845                                 }
 846                         }
 847
 848                 }
 849
 850         } else {
 851                 /* Throw packet away.. */
 852                 printk("%s: No descriptor?!?\n", __FUNCTION__);
 853                 flush(ep);
 854         }
 855 }
 856
 857 static void stop_activity(struct lh7a40x_udc *dev,
 858                           struct usb_gadget_driver *driver)
 859 {
 860         int i;
 861
 862         /* don't disconnect drivers more than once */
 863         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 864                 driver = 0;
 865         dev->gadget.speed = USB_SPEED_UNKNOWN;
 866
 867         /* prevent new request submissions, kill any outstanding requests  */
 868         for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
 869                 struct lh7a40x_ep *ep = &dev->ep[i];
 870                 ep->stopped = 1;
 871
 872                 usb_set_index(i);
 873                 nuke(ep, -ESHUTDOWN);
 874         }
 875
 876         /* report disconnect; the driver is already quiesced */
 877         if (driver) {
 878                 spin_unlock(&dev->lock);
 879                 driver->disconnect(&dev->gadget);
 880                 spin_lock(&dev->lock);
 881         }
 882
 883         /* re-init driver-visible data structures */
 884         udc_reinit(dev);
 885 }
 886
 887 /** Handle USB RESET interrupt
 888  */
 889 static void lh7a40x_reset_intr(struct lh7a40x_udc *dev)
 890 {
 891 #if 0                           /* def CONFIG_ARCH_LH7A404 */
 892         /* Does not work always... */
 893
 894         DEBUG("%s: %d\n", __FUNCTION__, dev->usb_address);
 895
 896         if (!dev->usb_address) {
 897                 /*usb_set(USB_RESET_IO, USB_RESET);
 898                    mdelay(5);
 899                    usb_clear(USB_RESET_IO, USB_RESET); */
 900                 return;
 901         }
 902         /* Put the USB controller into reset. */
 903         usb_set(USB_RESET_IO, USB_RESET);
 904
 905         /* Set Device ID to 0 */
 906         udc_set_address(dev, 0);
 907
 908         /* Let PLL2 settle down */
 909         mdelay(5);
 910
 911         /* Release the USB controller from reset */
 912         usb_clear(USB_RESET_IO, USB_RESET);
 913
 914         /* Re-enable UDC */
 915         udc_enable(dev);
 916
 917 #endif
 918         dev->gadget.speed = USB_SPEED_FULL;
 919 }
 920
 921 /*
 922  *      lh7a40x usb client interrupt handler.
 923  */
 924 static irqreturn_t lh7a40x_udc_irq(int irq, void *_dev)
 925 {
 926         struct lh7a40x_udc *dev = _dev;
 927
 928         DEBUG("\n\n");
 929
 930         spin_lock(&dev->lock);
 931
 932         for (;;) {
 933                 u32 intr_in = usb_read(USB_IN_INT);
 934                 u32 intr_out = usb_read(USB_OUT_INT);
 935                 u32 intr_int = usb_read(USB_INT);
 936
 937                 /* Test also against enable bits.. (lh7a40x errata).. Sigh.. */
 938                 u32 in_en = usb_read(USB_IN_INT_EN);
 939                 u32 out_en = usb_read(USB_OUT_INT_EN);
 940
 941                 if (!intr_out && !intr_in && !intr_int)
 942                         break;
 943
 944                 DEBUG("%s (on state %s)\n", __FUNCTION__,
 945                       state_names[dev->ep0state]);
 946                 DEBUG("intr_out = %x\n", intr_out);
 947                 DEBUG("intr_in  = %x\n", intr_in);
 948                 DEBUG("intr_int = %x\n", intr_int);
 949
 950                 if (intr_in) {
 951                         usb_write(intr_in, USB_IN_INT);
 952
 953                         if ((intr_in & USB_IN_INT_EP1)
 954                             && (in_en & USB_IN_INT_EP1)) {
 955                                 DEBUG("USB_IN_INT_EP1\n");
 956                                 lh7a40x_in_epn(dev, 1, intr_in);
 957                         }
 958                         if ((intr_in & USB_IN_INT_EP3)
 959                             && (in_en & USB_IN_INT_EP3)) {
 960                                 DEBUG("USB_IN_INT_EP3\n");
 961                                 lh7a40x_in_epn(dev, 3, intr_in);
 962                         }
 963                         if (intr_in & USB_IN_INT_EP0) {
 964                                 DEBUG("USB_IN_INT_EP0 (control)\n");
 965                                 lh7a40x_handle_ep0(dev, intr_in);
 966                         }
 967                 }
 968
 969                 if (intr_out) {
 970                         usb_write(intr_out, USB_OUT_INT);
 971
 972                         if ((intr_out & USB_OUT_INT_EP2)
 973                             && (out_en & USB_OUT_INT_EP2)) {
 974                                 DEBUG("USB_OUT_INT_EP2\n");
 975                                 lh7a40x_out_epn(dev, 2, intr_out);
 976                         }
 977                 }
 978
 979                 if (intr_int) {
 980                         usb_write(intr_int, USB_INT);
 981
 982                         if (intr_int & USB_INT_RESET_INT) {
 983                                 lh7a40x_reset_intr(dev);
 984                         }
 985
 986                         if (intr_int & USB_INT_RESUME_INT) {
 987                                 DEBUG("USB resume\n");
 988
 989                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
 990                                     && dev->driver
 991                                     && dev->driver->resume
 992                                     && is_usb_connected()) {
 993                                         dev->driver->resume(&dev->gadget);
 994                                 }
 995                         }
 996
 997                         if (intr_int & USB_INT_SUSPEND_INT) {
 998                                 DEBUG("USB suspend%s\n",
 999                                       is_usb_connected()? "" : "+disconnect");
1000                                 if (!is_usb_connected()) {
1001                                         stop_activity(dev, dev->driver);
1002                                 } else if (dev->gadget.speed !=
1003                                            USB_SPEED_UNKNOWN && dev->driver
1004                                            && dev->driver->suspend) {
1005                                         dev->driver->suspend(&dev->gadget);
1006                                 }
1007                         }
1008
1009                 }
1010         }
1011
1012         spin_unlock(&dev->lock);
1013
1014         return IRQ_HANDLED;
1015 }
1016
1017 static int lh7a40x_ep_enable(struct usb_ep *_ep,
1018                              const struct usb_endpoint_descriptor *desc)
1019 {
1020         struct lh7a40x_ep *ep;
1021         struct lh7a40x_udc *dev;
1022         unsigned long flags;
1023
1024         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1025
1026         ep = container_of(_ep, struct lh7a40x_ep, ep);
1027         if (!_ep || !desc || ep->desc || _ep->name == ep0name
1028             || desc->bDescriptorType != USB_DT_ENDPOINT
1029             || ep->bEndpointAddress != desc->bEndpointAddress
1030             || ep_maxpacket(ep) < le16_to_cpu(desc->wMaxPacketSize)) {
1031                 DEBUG("%s, bad ep or descriptor\n", __FUNCTION__);
1032                 return -EINVAL;
1033         }
1034
1035         /* xfer types must match, except that interrupt ~= bulk */
1036         if (ep->bmAttributes != desc->bmAttributes
1037             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
1038             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
1039                 DEBUG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
1040                 return -EINVAL;
1041         }
1042
1043         /* hardware _could_ do smaller, but driver doesn't */
1044         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
1045              && le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(ep))
1046             || !desc->wMaxPacketSize) {
1047                 DEBUG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
1048                 return -ERANGE;
1049         }
1050
1051         dev = ep->dev;
1052         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1053                 DEBUG("%s, bogus device state\n", __FUNCTION__);
1054                 return -ESHUTDOWN;
1055         }
1056
1057         spin_lock_irqsave(&ep->dev->lock, flags);
1058
1059         ep->stopped = 0;
1060         ep->desc = desc;
1061         ep->pio_irqs = 0;
1062         ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
1063
1064         spin_unlock_irqrestore(&ep->dev->lock, flags);
1065
1066         /* Reset halt state (does flush) */
1067         lh7a40x_set_halt(_ep, 0);
1068
1069         DEBUG("%s: enabled %s\n", __FUNCTION__, _ep->name);
1070         return 0;
1071 }
1072
1073 /** Disable EP
1074  *  NOTE: Sets INDEX register
1075  */
1076 static int lh7a40x_ep_disable(struct usb_ep *_ep)
1077 {
1078         struct lh7a40x_ep *ep;
1079         unsigned long flags;
1080
1081         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1082
1083         ep = container_of(_ep, struct lh7a40x_ep, ep);
1084         if (!_ep || !ep->desc) {
1085                 DEBUG("%s, %s not enabled\n", __FUNCTION__,
1086                       _ep ? ep->ep.name : NULL);
1087                 return -EINVAL;
1088         }
1089
1090         spin_lock_irqsave(&ep->dev->lock, flags);
1091
1092         usb_set_index(ep_index(ep));
1093
1094         /* Nuke all pending requests (does flush) */
1095         nuke(ep, -ESHUTDOWN);
1096
1097         /* Disable ep IRQ */
1098         pio_irq_disable(ep_index(ep));
1099
1100         ep->desc = 0;
1101         ep->stopped = 1;
1102
1103         spin_unlock_irqrestore(&ep->dev->lock, flags);
1104
1105         DEBUG("%s: disabled %s\n", __FUNCTION__, _ep->name);
1106         return 0;
1107 }
1108
1109 static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep,
1110                                                  gfp_t gfp_flags)
1111 {
1112         struct lh7a40x_request *req;
1113
1114         DEBUG("%s, %p\n", __FUNCTION__, ep);
1115
1116         req = kzalloc(sizeof(*req), gfp_flags);
1117         if (!req)
1118                 return 0;
1119
1120         INIT_LIST_HEAD(&req->queue);
1121
1122         return &req->req;
1123 }
1124
1125 static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *_req)
1126 {
1127         struct lh7a40x_request *req;
1128
1129         DEBUG("%s, %p\n", __FUNCTION__, ep);
1130
1131         req = container_of(_req, struct lh7a40x_request, req);
1132         WARN_ON(!list_empty(&req->queue));
1133         kfree(req);
1134 }
1135
1136 static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned bytes,
1137                                   dma_addr_t * dma, gfp_t gfp_flags)
1138 {
1139         char *retval;
1140
1141         DEBUG("%s (%p, %d, %d)\n", __FUNCTION__, ep, bytes, gfp_flags);
1142
1143         retval = kmalloc(bytes, gfp_flags & ~(__GFP_DMA | __GFP_HIGHMEM));
1144         if (retval)
1145                 *dma = virt_to_bus(retval);
1146         return retval;
1147 }
1148
1149 static void lh7a40x_free_buffer(struct usb_ep *ep, void *buf, dma_addr_t dma,
1150                                 unsigned bytes)
1151 {
1152         DEBUG("%s, %p\n", __FUNCTION__, ep);
1153         kfree(buf);
1154 }
1155
1156 /** Queue one request
1157  *  Kickstart transfer if needed
1158  *  NOTE: Sets INDEX register
1159  */
1160 static int lh7a40x_queue(struct usb_ep *_ep, struct usb_request *_req,
1161                          gfp_t gfp_flags)
1162 {
1163         struct lh7a40x_request *req;
1164         struct lh7a40x_ep *ep;
1165         struct lh7a40x_udc *dev;
1166         unsigned long flags;
1167
1168         DEBUG("\n\n\n%s, %p\n", __FUNCTION__, _ep);
1169
1170         req = container_of(_req, struct lh7a40x_request, req);
1171         if (unlikely
1172             (!_req || !_req->complete || !_req->buf
1173              || !list_empty(&req->queue))) {
1174                 DEBUG("%s, bad params\n", __FUNCTION__);
1175                 return -EINVAL;
1176         }
1177
1178         ep = container_of(_ep, struct lh7a40x_ep, ep);
1179         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1180                 DEBUG("%s, bad ep\n", __FUNCTION__);
1181                 return -EINVAL;
1182         }
1183
1184         dev = ep->dev;
1185         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
1186                 DEBUG("%s, bogus device state %p\n", __FUNCTION__, dev->driver);
1187                 return -ESHUTDOWN;
1188         }
1189
1190         DEBUG("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length,
1191               _req->buf);
1192
1193         spin_lock_irqsave(&dev->lock, flags);
1194
1195         _req->status = -EINPROGRESS;
1196         _req->actual = 0;
1197
1198         /* kickstart this i/o queue? */
1199         DEBUG("Add to %d Q %d %d\n", ep_index(ep), list_empty(&ep->queue),
1200               ep->stopped);
1201         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
1202                 u32 csr;
1203
1204                 if (unlikely(ep_index(ep) == 0)) {
1205                         /* EP0 */
1206                         list_add_tail(&req->queue, &ep->queue);
1207                         lh7a40x_ep0_kick(dev, ep);
1208                         req = 0;
1209                 } else if (ep_is_in(ep)) {
1210                         /* EP1 & EP3 */
1211                         usb_set_index(ep_index(ep));
1212                         csr = usb_read(ep->csr1);
1213                         pio_irq_enable(ep_index(ep));
1214                         if ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY) == 0) {
1215                                 if (write_fifo(ep, req) == 1)
1216                                         req = 0;
1217                         }
1218                 } else {
1219                         /* EP2 */
1220                         usb_set_index(ep_index(ep));
1221                         csr = usb_read(ep->csr1);
1222                         pio_irq_enable(ep_index(ep));
1223                         if (!(csr & USB_OUT_CSR1_FIFO_FULL)) {
1224                                 if (read_fifo(ep, req) == 1)
1225                                         req = 0;
1226                         }
1227                 }
1228         }
1229
1230         /* pio or dma irq handler advances the queue. */
1231         if (likely(req != 0))
1232                 list_add_tail(&req->queue, &ep->queue);
1233
1234         spin_unlock_irqrestore(&dev->lock, flags);
1235
1236         return 0;
1237 }
1238
1239 /* dequeue JUST ONE request */
1240 static int lh7a40x_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1241 {
1242         struct lh7a40x_ep *ep;
1243         struct lh7a40x_request *req;
1244         unsigned long flags;
1245
1246         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1247
1248         ep = container_of(_ep, struct lh7a40x_ep, ep);
1249         if (!_ep || ep->ep.name == ep0name)
1250                 return -EINVAL;
1251
1252         spin_lock_irqsave(&ep->dev->lock, flags);
1253
1254         /* make sure it's actually queued on this endpoint */
1255         list_for_each_entry(req, &ep->queue, queue) {
1256                 if (&req->req == _req)
1257                         break;
1258         }
1259         if (&req->req != _req) {
1260                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1261                 return -EINVAL;
1262         }
1263
1264         done(ep, req, -ECONNRESET);
1265
1266         spin_unlock_irqrestore(&ep->dev->lock, flags);
1267         return 0;
1268 }
1269
1270 /** Halt specific EP
1271  *  Return 0 if success
1272  *  NOTE: Sets INDEX register to EP !
1273  */
1274 static int lh7a40x_set_halt(struct usb_ep *_ep, int value)
1275 {
1276         struct lh7a40x_ep *ep;
1277         unsigned long flags;
1278
1279         ep = container_of(_ep, struct lh7a40x_ep, ep);
1280         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1281                 DEBUG("%s, bad ep\n", __FUNCTION__);
1282                 return -EINVAL;
1283         }
1284
1285         usb_set_index(ep_index(ep));
1286
1287         DEBUG("%s, ep %d, val %d\n", __FUNCTION__, ep_index(ep), value);
1288
1289         spin_lock_irqsave(&ep->dev->lock, flags);
1290
1291         if (ep_index(ep) == 0) {
1292                 /* EP0 */
1293                 usb_set(EP0_SEND_STALL, ep->csr1);
1294         } else if (ep_is_in(ep)) {
1295                 u32 csr = usb_read(ep->csr1);
1296                 if (value && ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY)
1297                               || !list_empty(&ep->queue))) {
1298                         /*
1299                          * Attempts to halt IN endpoints will fail (returning -EAGAIN)
1300                          * if any transfer requests are still queued, or if the controller
1301                          * FIFO still holds bytes that the host hasn\92t collected.
1302                          */
1303                         spin_unlock_irqrestore(&ep->dev->lock, flags);
1304                         DEBUG
1305                             ("Attempt to halt IN endpoint failed (returning -EAGAIN) %d %d\n",
1306                              (csr & USB_IN_CSR1_FIFO_NOT_EMPTY),
1307                              !list_empty(&ep->queue));
1308                         return -EAGAIN;
1309                 }
1310                 flush(ep);
1311                 if (value)
1312                         usb_set(USB_IN_CSR1_SEND_STALL, ep->csr1);
1313                 else {
1314                         usb_clear(USB_IN_CSR1_SEND_STALL, ep->csr1);
1315                         usb_set(USB_IN_CSR1_CLR_DATA_TOGGLE, ep->csr1);
1316                 }
1317
1318         } else {
1319
1320                 flush(ep);
1321                 if (value)
1322                         usb_set(USB_OUT_CSR1_SEND_STALL, ep->csr1);
1323                 else {
1324                         usb_clear(USB_OUT_CSR1_SEND_STALL, ep->csr1);
1325                         usb_set(USB_OUT_CSR1_CLR_DATA_REG, ep->csr1);
1326                 }
1327         }
1328
1329         if (value) {
1330                 ep->stopped = 1;
1331         } else {
1332                 ep->stopped = 0;
1333         }
1334
1335         spin_unlock_irqrestore(&ep->dev->lock, flags);
1336
1337         DEBUG("%s %s halted\n", _ep->name, value == 0 ? "NOT" : "IS");
1338
1339         return 0;
1340 }
1341
1342 /** Return bytes in EP FIFO
1343  *  NOTE: Sets INDEX register to EP
1344  */
1345 static int lh7a40x_fifo_status(struct usb_ep *_ep)
1346 {
1347         u32 csr;
1348         int count = 0;
1349         struct lh7a40x_ep *ep;
1350
1351         ep = container_of(_ep, struct lh7a40x_ep, ep);
1352         if (!_ep) {
1353                 DEBUG("%s, bad ep\n", __FUNCTION__);
1354                 return -ENODEV;
1355         }
1356
1357         DEBUG("%s, %d\n", __FUNCTION__, ep_index(ep));
1358
1359         /* LPD can't report unclaimed bytes from IN fifos */
1360         if (ep_is_in(ep))
1361                 return -EOPNOTSUPP;
1362
1363         usb_set_index(ep_index(ep));
1364
1365         csr = usb_read(ep->csr1);
1366         if (ep->dev->gadget.speed != USB_SPEED_UNKNOWN ||
1367             csr & USB_OUT_CSR1_OUT_PKT_RDY) {
1368                 count = usb_read(USB_OUT_FIFO_WC1);
1369         }
1370
1371         return count;
1372 }
1373
1374 /** Flush EP FIFO
1375  *  NOTE: Sets INDEX register to EP
1376  */
1377 static void lh7a40x_fifo_flush(struct usb_ep *_ep)
1378 {
1379         struct lh7a40x_ep *ep;
1380
1381         ep = container_of(_ep, struct lh7a40x_ep, ep);
1382         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1383                 DEBUG("%s, bad ep\n", __FUNCTION__);
1384                 return;
1385         }
1386
1387         usb_set_index(ep_index(ep));
1388         flush(ep);
1389 }
1390
1391 /****************************************************************/
1392 /* End Point 0 related functions                                */
1393 /****************************************************************/
1394
1395 /* return:  0 = still running, 1 = completed, negative = errno */
1396 static int write_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
1397 {
1398         u32 max;
1399         unsigned count;
1400         int is_last;
1401
1402         max = ep_maxpacket(ep);
1403
1404         DEBUG_EP0("%s\n", __FUNCTION__);
1405
1406         count = write_packet(ep, req, max);
1407
1408         /* last packet is usually short (or a zlp) */
1409         if (unlikely(count != max))
1410                 is_last = 1;
1411         else {
1412                 if (likely(req->req.length != req->req.actual) || req->req.zero)
1413                         is_last = 0;
1414                 else
1415                         is_last = 1;
1416         }
1417
1418         DEBUG_EP0("%s: wrote %s %d bytes%s %d left %p\n", __FUNCTION__,
1419                   ep->ep.name, count,
1420                   is_last ? "/L" : "", req->req.length - req->req.actual, req);
1421
1422         /* requests complete when all IN data is in the FIFO */
1423         if (is_last) {
1424                 done(ep, req, 0);
1425                 return 1;
1426         }
1427
1428         return 0;
1429 }
1430
1431 static __inline__ int lh7a40x_fifo_read(struct lh7a40x_ep *ep,
1432                                         unsigned char *cp, int max)
1433 {
1434         int bytes;
1435         int count = usb_read(USB_OUT_FIFO_WC1);
1436         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1437
1438         if (count > max)
1439                 count = max;
1440         bytes = count;
1441         while (count--)
1442                 *cp++ = *fifo & 0xFF;
1443         return bytes;
1444 }
1445
1446 static __inline__ void lh7a40x_fifo_write(struct lh7a40x_ep *ep,
1447                                           unsigned char *cp, int count)
1448 {
1449         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1450         DEBUG_EP0("fifo_write: %d %d\n", ep_index(ep), count);
1451         while (count--)
1452                 *fifo = *cp++;
1453 }
1454
1455 static int read_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
1456 {
1457         u32 csr;
1458         u8 *buf;
1459         unsigned bufferspace, count, is_short;
1460         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1461
1462         DEBUG_EP0("%s\n", __FUNCTION__);
1463
1464         csr = usb_read(USB_EP0_CSR);
1465         if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY))
1466                 return 0;
1467
1468         buf = req->req.buf + req->req.actual;
1469         prefetchw(buf);
1470         bufferspace = req->req.length - req->req.actual;
1471
1472         /* read all bytes from this packet */
1473         if (likely(csr & EP0_OUT_PKT_RDY)) {
1474                 count = usb_read(USB_OUT_FIFO_WC1);
1475                 req->req.actual += min(count, bufferspace);
1476         } else                  /* zlp */
1477                 count = 0;
1478
1479         is_short = (count < ep->ep.maxpacket);
1480         DEBUG_EP0("read %s %02x, %d bytes%s req %p %d/%d\n",
1481                   ep->ep.name, csr, count,
1482                   is_short ? "/S" : "", req, req->req.actual, req->req.length);
1483
1484         while (likely(count-- != 0)) {
1485                 u8 byte = (u8) (*fifo & 0xff);
1486
1487                 if (unlikely(bufferspace == 0)) {
1488                         /* this happens when the driver's buffer
1489                          * is smaller than what the host sent.
1490                          * discard the extra data.
1491                          */
1492                         if (req->req.status != -EOVERFLOW)
1493                                 DEBUG_EP0("%s overflow %d\n", ep->ep.name,
1494                                           count);
1495                         req->req.status = -EOVERFLOW;
1496                 } else {
1497                         *buf++ = byte;
1498                         bufferspace--;
1499                 }
1500         }
1501
1502         /* completion */
1503         if (is_short || req->req.actual == req->req.length) {
1504                 done(ep, req, 0);
1505                 return 1;
1506         }
1507
1508         /* finished that packet.  the next one may be waiting... */
1509         return 0;
1510 }
1511
1512 /**
1513  * udc_set_address - set the USB address for this device
1514  * @address:
1515  *
1516  * Called from control endpoint function after it decodes a set address setup packet.
1517  */
1518 static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address)
1519 {
1520         DEBUG_EP0("%s: %d\n", __FUNCTION__, address);
1521         /* c.f. 15.1.2.2 Table 15-4 address will be used after DATA_END is set */
1522         dev->usb_address = address;
1523         usb_set((address & USB_FA_FUNCTION_ADDR), USB_FA);
1524         usb_set(USB_FA_ADDR_UPDATE | (address & USB_FA_FUNCTION_ADDR), USB_FA);
1525         /* usb_read(USB_FA); */
1526 }
1527
1528 /*
1529  * DATA_STATE_RECV (OUT_PKT_RDY)
1530  *      - if error
1531  *              set EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL bits
1532  *      - else
1533  *              set EP0_CLR_OUT bit
1534                                 if last set EP0_DATA_END bit
1535  */
1536 static void lh7a40x_ep0_out(struct lh7a40x_udc *dev, u32 csr)
1537 {
1538         struct lh7a40x_request *req;
1539         struct lh7a40x_ep *ep = &dev->ep[0];
1540         int ret;
1541
1542         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1543
1544         if (list_empty(&ep->queue))
1545                 req = 0;
1546         else
1547                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
1548
1549         if (req) {
1550
1551                 if (req->req.length == 0) {
1552                         DEBUG_EP0("ZERO LENGTH OUT!\n");
1553                         usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1554                         dev->ep0state = WAIT_FOR_SETUP;
1555                         return;
1556                 }
1557                 ret = read_fifo_ep0(ep, req);
1558                 if (ret) {
1559                         /* Done! */
1560                         DEBUG_EP0("%s: finished, waiting for status\n",
1561                                   __FUNCTION__);
1562
1563                         usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1564                         dev->ep0state = WAIT_FOR_SETUP;
1565                 } else {
1566                         /* Not done yet.. */
1567                         DEBUG_EP0("%s: not finished\n", __FUNCTION__);
1568                         usb_set(EP0_CLR_OUT, USB_EP0_CSR);
1569                 }
1570         } else {
1571                 DEBUG_EP0("NO REQ??!\n");
1572         }
1573 }
1574
1575 /*
1576  * DATA_STATE_XMIT
1577  */
1578 static int lh7a40x_ep0_in(struct lh7a40x_udc *dev, u32 csr)
1579 {
1580         struct lh7a40x_request *req;
1581         struct lh7a40x_ep *ep = &dev->ep[0];
1582         int ret, need_zlp = 0;
1583
1584         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1585
1586         if (list_empty(&ep->queue))
1587                 req = 0;
1588         else
1589                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
1590
1591         if (!req) {
1592                 DEBUG_EP0("%s: NULL REQ\n", __FUNCTION__);
1593                 return 0;
1594         }
1595
1596         if (req->req.length == 0) {
1597
1598                 usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1599                 dev->ep0state = WAIT_FOR_SETUP;
1600                 return 1;
1601         }
1602
1603         if (req->req.length - req->req.actual == EP0_PACKETSIZE) {
1604                 /* Next write will end with the packet size, */
1605                 /* so we need Zero-length-packet */
1606                 need_zlp = 1;
1607         }
1608
1609         ret = write_fifo_ep0(ep, req);
1610
1611         if (ret == 1 && !need_zlp) {
1612                 /* Last packet */
1613                 DEBUG_EP0("%s: finished, waiting for status\n", __FUNCTION__);
1614
1615                 usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1616                 dev->ep0state = WAIT_FOR_SETUP;
1617         } else {
1618                 DEBUG_EP0("%s: not finished\n", __FUNCTION__);
1619                 usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
1620         }
1621
1622         if (need_zlp) {
1623                 DEBUG_EP0("%s: Need ZLP!\n", __FUNCTION__);
1624                 usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
1625                 dev->ep0state = DATA_STATE_NEED_ZLP;
1626         }
1627
1628         return 1;
1629 }
1630
1631 static int lh7a40x_handle_get_status(struct lh7a40x_udc *dev,
1632                                      struct usb_ctrlrequest *ctrl)
1633 {
1634         struct lh7a40x_ep *ep0 = &dev->ep[0];
1635         struct lh7a40x_ep *qep;
1636         int reqtype = (ctrl->bRequestType & USB_RECIP_MASK);
1637         u16 val = 0;
1638
1639         if (reqtype == USB_RECIP_INTERFACE) {
1640                 /* This is not supported.
1641                  * And according to the USB spec, this one does nothing..
1642                  * Just return 0
1643                  */
1644                 DEBUG_SETUP("GET_STATUS: USB_RECIP_INTERFACE\n");
1645         } else if (reqtype == USB_RECIP_DEVICE) {
1646                 DEBUG_SETUP("GET_STATUS: USB_RECIP_DEVICE\n");
1647                 val |= (1 << 0);        /* Self powered */
1648                 /*val |= (1<<1); *//* Remote wakeup */
1649         } else if (reqtype == USB_RECIP_ENDPOINT) {
1650                 int ep_num = (ctrl->wIndex & ~USB_DIR_IN);
1651
1652                 DEBUG_SETUP
1653                     ("GET_STATUS: USB_RECIP_ENDPOINT (%d), ctrl->wLength = %d\n",
1654                      ep_num, ctrl->wLength);
1655
1656                 if (ctrl->wLength > 2 || ep_num > 3)
1657                         return -EOPNOTSUPP;
1658
1659                 qep = &dev->ep[ep_num];
1660                 if (ep_is_in(qep) != ((ctrl->wIndex & USB_DIR_IN) ? 1 : 0)
1661                     && ep_index(qep) != 0) {
1662                         return -EOPNOTSUPP;
1663                 }
1664
1665                 usb_set_index(ep_index(qep));
1666
1667                 /* Return status on next IN token */
1668                 switch (qep->ep_type) {
1669                 case ep_control:
1670                         val =
1671                             (usb_read(qep->csr1) & EP0_SEND_STALL) ==
1672                             EP0_SEND_STALL;
1673                         break;
1674                 case ep_bulk_in:
1675                 case ep_interrupt:
1676                         val =
1677                             (usb_read(qep->csr1) & USB_IN_CSR1_SEND_STALL) ==
1678                             USB_IN_CSR1_SEND_STALL;
1679                         break;
1680                 case ep_bulk_out:
1681                         val =
1682                             (usb_read(qep->csr1) & USB_OUT_CSR1_SEND_STALL) ==
1683                             USB_OUT_CSR1_SEND_STALL;
1684                         break;
1685                 }
1686
1687                 /* Back to EP0 index */
1688                 usb_set_index(0);
1689
1690                 DEBUG_SETUP("GET_STATUS, ep: %d (%x), val = %d\n", ep_num,
1691                             ctrl->wIndex, val);
1692         } else {
1693                 DEBUG_SETUP("Unknown REQ TYPE: %d\n", reqtype);
1694                 return -EOPNOTSUPP;
1695         }
1696
1697         /* Clear "out packet ready" */
1698         usb_set((EP0_CLR_OUT), USB_EP0_CSR);
1699         /* Put status to FIFO */
1700         lh7a40x_fifo_write(ep0, (u8 *) & val, sizeof(val));
1701         /* Issue "In packet ready" */
1702         usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1703
1704         return 0;
1705 }
1706
1707 /*
1708  * WAIT_FOR_SETUP (OUT_PKT_RDY)
1709  *      - read data packet from EP0 FIFO
1710  *      - decode command
1711  *      - if error
1712  *              set EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL bits
1713  *      - else
1714  *              set EP0_CLR_OUT | EP0_DATA_END bits
1715  */
1716 static void lh7a40x_ep0_setup(struct lh7a40x_udc *dev, u32 csr)
1717 {
1718         struct lh7a40x_ep *ep = &dev->ep[0];
1719         struct usb_ctrlrequest ctrl;
1720         int i, bytes, is_in;
1721
1722         DEBUG_SETUP("%s: %x\n", __FUNCTION__, csr);
1723
1724         /* Nuke all previous transfers */
1725         nuke(ep, -EPROTO);
1726
1727         /* read control req from fifo (8 bytes) */
1728         bytes = lh7a40x_fifo_read(ep, (unsigned char *)&ctrl, 8);
1729
1730         DEBUG_SETUP("Read CTRL REQ %d bytes\n", bytes);
1731         DEBUG_SETUP("CTRL.bRequestType = %d (is_in %d)\n", ctrl.bRequestType,
1732                     ctrl.bRequestType == USB_DIR_IN);
1733         DEBUG_SETUP("CTRL.bRequest = %d\n", ctrl.bRequest);
1734         DEBUG_SETUP("CTRL.wLength = %d\n", ctrl.wLength);
1735         DEBUG_SETUP("CTRL.wValue = %d (%d)\n", ctrl.wValue, ctrl.wValue >> 8);
1736         DEBUG_SETUP("CTRL.wIndex = %d\n", ctrl.wIndex);
1737
1738         /* Set direction of EP0 */
1739         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1740                 ep->bEndpointAddress |= USB_DIR_IN;
1741                 is_in = 1;
1742         } else {
1743                 ep->bEndpointAddress &= ~USB_DIR_IN;
1744                 is_in = 0;
1745         }
1746
1747         dev->req_pending = 1;
1748
1749         /* Handle some SETUP packets ourselves */
1750         switch (ctrl.bRequest) {
1751         case USB_REQ_SET_ADDRESS:
1752                 if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
1753                         break;
1754
1755                 DEBUG_SETUP("USB_REQ_SET_ADDRESS (%d)\n", ctrl.wValue);
1756                 udc_set_address(dev, ctrl.wValue);
1757                 usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1758                 return;
1759
1760         case USB_REQ_GET_STATUS:{
1761                         if (lh7a40x_handle_get_status(dev, &ctrl) == 0)
1762                                 return;
1763
1764         case USB_REQ_CLEAR_FEATURE:
1765         case USB_REQ_SET_FEATURE:
1766                         if (ctrl.bRequestType == USB_RECIP_ENDPOINT) {
1767                                 struct lh7a40x_ep *qep;
1768                                 int ep_num = (ctrl.wIndex & 0x0f);
1769
1770                                 /* Support only HALT feature */
1771                                 if (ctrl.wValue != 0 || ctrl.wLength != 0
1772                                     || ep_num > 3 || ep_num < 1)
1773                                         break;
1774
1775                                 qep = &dev->ep[ep_num];
1776                                 spin_unlock(&dev->lock);
1777                                 if (ctrl.bRequest == USB_REQ_SET_FEATURE) {
1778                                         DEBUG_SETUP("SET_FEATURE (%d)\n",
1779                                                     ep_num);
1780                                         lh7a40x_set_halt(&qep->ep, 1);
1781                                 } else {
1782                                         DEBUG_SETUP("CLR_FEATURE (%d)\n",
1783                                                     ep_num);
1784                                         lh7a40x_set_halt(&qep->ep, 0);
1785                                 }
1786                                 spin_lock(&dev->lock);
1787                                 usb_set_index(0);
1788
1789                                 /* Reply with a ZLP on next IN token */
1790                                 usb_set((EP0_CLR_OUT | EP0_DATA_END),
1791                                         USB_EP0_CSR);
1792                                 return;
1793                         }
1794                         break;
1795                 }
1796
1797         default:
1798                 break;
1799         }
1800
1801         if (likely(dev->driver)) {
1802                 /* device-2-host (IN) or no data setup command, process immediately */
1803                 spin_unlock(&dev->lock);
1804                 i = dev->driver->setup(&dev->gadget, &ctrl);
1805                 spin_lock(&dev->lock);
1806
1807                 if (i < 0) {
1808                         /* setup processing failed, force stall */
1809                         DEBUG_SETUP
1810                             ("  --> ERROR: gadget setup FAILED (stalling), setup returned %d\n",
1811                              i);
1812                         usb_set_index(0);
1813                         usb_set((EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL),
1814                                 USB_EP0_CSR);
1815
1816                         /* ep->stopped = 1; */
1817                         dev->ep0state = WAIT_FOR_SETUP;
1818                 }
1819         }
1820 }
1821
1822 /*
1823  * DATA_STATE_NEED_ZLP
1824  */
1825 static void lh7a40x_ep0_in_zlp(struct lh7a40x_udc *dev, u32 csr)
1826 {
1827         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1828
1829         /* c.f. Table 15-14 */
1830         usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1831         dev->ep0state = WAIT_FOR_SETUP;
1832 }
1833
1834 /*
1835  * handle ep0 interrupt
1836  */
1837 static void lh7a40x_handle_ep0(struct lh7a40x_udc *dev, u32 intr)
1838 {
1839         struct lh7a40x_ep *ep = &dev->ep[0];
1840         u32 csr;
1841
1842         /* Set index 0 */
1843         usb_set_index(0);
1844         csr = usb_read(USB_EP0_CSR);
1845
1846         DEBUG_EP0("%s: csr = %x\n", __FUNCTION__, csr);
1847
1848         /*
1849          * For overview of what we should be doing see c.f. Chapter 18.1.2.4
1850          * We will follow that outline here modified by our own global state
1851          * indication which provides hints as to what we think should be
1852          * happening..
1853          */
1854
1855         /*
1856          * if SENT_STALL is set
1857          *      - clear the SENT_STALL bit
1858          */
1859         if (csr & EP0_SENT_STALL) {
1860                 DEBUG_EP0("%s: EP0_SENT_STALL is set: %x\n", __FUNCTION__, csr);
1861                 usb_clear((EP0_SENT_STALL | EP0_SEND_STALL), USB_EP0_CSR);
1862                 nuke(ep, -ECONNABORTED);
1863                 dev->ep0state = WAIT_FOR_SETUP;
1864                 return;
1865         }
1866
1867         /*
1868          * if a transfer is in progress && IN_PKT_RDY and OUT_PKT_RDY are clear
1869          *      - fill EP0 FIFO
1870          *      - if last packet
1871          *      -       set IN_PKT_RDY | DATA_END
1872          *      - else
1873          *              set IN_PKT_RDY
1874          */
1875         if (!(csr & (EP0_IN_PKT_RDY | EP0_OUT_PKT_RDY))) {
1876                 DEBUG_EP0("%s: IN_PKT_RDY and OUT_PKT_RDY are clear\n",
1877                           __FUNCTION__);
1878
1879                 switch (dev->ep0state) {
1880                 case DATA_STATE_XMIT:
1881                         DEBUG_EP0("continue with DATA_STATE_XMIT\n");
1882                         lh7a40x_ep0_in(dev, csr);
1883                         return;
1884                 case DATA_STATE_NEED_ZLP:
1885                         DEBUG_EP0("continue with DATA_STATE_NEED_ZLP\n");
1886                         lh7a40x_ep0_in_zlp(dev, csr);
1887                         return;
1888                 default:
1889                         /* Stall? */
1890                         DEBUG_EP0("Odd state!! state = %s\n",
1891                                   state_names[dev->ep0state]);
1892                         dev->ep0state = WAIT_FOR_SETUP;
1893                         /* nuke(ep, 0); */
1894                         /* usb_set(EP0_SEND_STALL, ep->csr1); */
1895                         break;
1896                 }
1897         }
1898
1899         /*
1900          * if SETUP_END is set
1901          *      - abort the last transfer
1902          *      - set SERVICED_SETUP_END_BIT
1903          */
1904         if (csr & EP0_SETUP_END) {
1905                 DEBUG_EP0("%s: EP0_SETUP_END is set: %x\n", __FUNCTION__, csr);
1906
1907                 usb_set(EP0_CLR_SETUP_END, USB_EP0_CSR);
1908
1909                 nuke(ep, 0);
1910                 dev->ep0state = WAIT_FOR_SETUP;
1911         }
1912
1913         /*
1914          * if EP0_OUT_PKT_RDY is set
1915          *      - read data packet from EP0 FIFO
1916          *      - decode command
1917          *      - if error
1918          *              set SERVICED_OUT_PKT_RDY | DATA_END bits | SEND_STALL
1919          *      - else
1920          *              set SERVICED_OUT_PKT_RDY | DATA_END bits
1921          */
1922         if (csr & EP0_OUT_PKT_RDY) {
1923
1924                 DEBUG_EP0("%s: EP0_OUT_PKT_RDY is set: %x\n", __FUNCTION__,
1925                           csr);
1926
1927                 switch (dev->ep0state) {
1928                 case WAIT_FOR_SETUP:
1929                         DEBUG_EP0("WAIT_FOR_SETUP\n");
1930                         lh7a40x_ep0_setup(dev, csr);
1931                         break;
1932
1933                 case DATA_STATE_RECV:
1934                         DEBUG_EP0("DATA_STATE_RECV\n");
1935                         lh7a40x_ep0_out(dev, csr);
1936                         break;
1937
1938                 default:
1939                         /* send stall? */
1940                         DEBUG_EP0("strange state!! 2. send stall? state = %d\n",
1941                                   dev->ep0state);
1942                         break;
1943                 }
1944         }
1945 }
1946
1947 static void lh7a40x_ep0_kick(struct lh7a40x_udc *dev, struct lh7a40x_ep *ep)
1948 {
1949         u32 csr;
1950
1951         usb_set_index(0);
1952         csr = usb_read(USB_EP0_CSR);
1953
1954         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1955
1956         /* Clear "out packet ready" */
1957         usb_set(EP0_CLR_OUT, USB_EP0_CSR);
1958
1959         if (ep_is_in(ep)) {
1960                 dev->ep0state = DATA_STATE_XMIT;
1961                 lh7a40x_ep0_in(dev, csr);
1962         } else {
1963                 dev->ep0state = DATA_STATE_RECV;
1964                 lh7a40x_ep0_out(dev, csr);
1965         }
1966 }
1967
1968 /* ---------------------------------------------------------------------------
1969  *      device-scoped parts of the api to the usb controller hardware
1970  * ---------------------------------------------------------------------------
1971  */
1972
1973 static int lh7a40x_udc_get_frame(struct usb_gadget *_gadget)
1974 {
1975         u32 frame1 = usb_read(USB_FRM_NUM1);    /* Least significant 8 bits */
1976         u32 frame2 = usb_read(USB_FRM_NUM2);    /* Most significant 3 bits */
1977         DEBUG("%s, %p\n", __FUNCTION__, _gadget);
1978         return ((frame2 & 0x07) << 8) | (frame1 & 0xff);
1979 }
1980
1981 static int lh7a40x_udc_wakeup(struct usb_gadget *_gadget)
1982 {
1983         /* host may not have enabled remote wakeup */
1984         /*if ((UDCCS0 & UDCCS0_DRWF) == 0)
1985            return -EHOSTUNREACH;
1986            udc_set_mask_UDCCR(UDCCR_RSM); */
1987         return -ENOTSUPP;
1988 }
1989
1990 static const struct usb_gadget_ops lh7a40x_udc_ops = {
1991         .get_frame = lh7a40x_udc_get_frame,
1992         .wakeup = lh7a40x_udc_wakeup,
1993         /* current versions must always be self-powered */
1994 };
1995
1996 static void nop_release(struct device *dev)
1997 {
1998         DEBUG("%s %s\n", __FUNCTION__, dev->bus_id);
1999 }
2000
2001 static struct lh7a40x_udc memory = {
2002         .usb_address = 0,
2003
2004         .gadget = {
2005                    .ops = &lh7a40x_udc_ops,
2006                    .ep0 = &memory.ep[0].ep,
2007                    .name = driver_name,
2008                    .dev = {
2009                            .bus_id = "gadget",
2010                            .release = nop_release,
2011                            },
2012                    },
2013
2014         /* control endpoint */
2015         .ep[0] = {
2016                   .ep = {
2017                          .name = ep0name,
2018                          .ops = &lh7a40x_ep_ops,
2019                          .maxpacket = EP0_PACKETSIZE,
2020                          },
2021                   .dev = &memory,
2022
2023                   .bEndpointAddress = 0,
2024                   .bmAttributes = 0,
2025
2026                   .ep_type = ep_control,
2027                   .fifo = io_p2v(USB_EP0_FIFO),
2028                   .csr1 = USB_EP0_CSR,
2029                   .csr2 = USB_EP0_CSR,
2030                   },
2031
2032         /* first group of endpoints */
2033         .ep[1] = {
2034                   .ep = {
2035                          .name = "ep1in-bulk",
2036                          .ops = &lh7a40x_ep_ops,
2037                          .maxpacket = 64,
2038                          },
2039                   .dev = &memory,
2040
2041                   .bEndpointAddress = USB_DIR_IN | 1,
2042                   .bmAttributes = USB_ENDPOINT_XFER_BULK,
2043
2044                   .ep_type = ep_bulk_in,
2045                   .fifo = io_p2v(USB_EP1_FIFO),
2046                   .csr1 = USB_IN_CSR1,
2047                   .csr2 = USB_IN_CSR2,
2048                   },
2049
2050         .ep[2] = {
2051                   .ep = {
2052                          .name = "ep2out-bulk",
2053                          .ops = &lh7a40x_ep_ops,
2054                          .maxpacket = 64,
2055                          },
2056                   .dev = &memory,
2057
2058                   .bEndpointAddress = 2,
2059                   .bmAttributes = USB_ENDPOINT_XFER_BULK,
2060
2061                   .ep_type = ep_bulk_out,
2062                   .fifo = io_p2v(USB_EP2_FIFO),
2063                   .csr1 = USB_OUT_CSR1,
2064                   .csr2 = USB_OUT_CSR2,
2065                   },
2066
2067         .ep[3] = {
2068                   .ep = {
2069                          .name = "ep3in-int",
2070                          .ops = &lh7a40x_ep_ops,
2071                          .maxpacket = 64,
2072                          },
2073                   .dev = &memory,
2074
2075                   .bEndpointAddress = USB_DIR_IN | 3,
2076                   .bmAttributes = USB_ENDPOINT_XFER_INT,
2077
2078                   .ep_type = ep_interrupt,
2079                   .fifo = io_p2v(USB_EP3_FIFO),
2080                   .csr1 = USB_IN_CSR1,
2081                   .csr2 = USB_IN_CSR2,
2082                   },
2083 };
2084
2085 /*
2086  *      probe - binds to the platform device
2087  */
2088 static int lh7a40x_udc_probe(struct platform_device *pdev)
2089 {
2090         struct lh7a40x_udc *dev = &memory;
2091         int retval;
2092
2093         DEBUG("%s: %p\n", __FUNCTION__, pdev);
2094
2095         spin_lock_init(&dev->lock);
2096         dev->dev = &pdev->dev;
2097
2098         device_initialize(&dev->gadget.dev);
2099         dev->gadget.dev.parent = &pdev->dev;
2100
2101         the_controller = dev;
2102         platform_set_drvdata(pdev, dev);
2103
2104         udc_disable(dev);
2105         udc_reinit(dev);
2106
2107         /* irq setup after old hardware state is cleaned up */
2108         retval =
2109             request_irq(IRQ_USBINTR, lh7a40x_udc_irq, IRQF_DISABLED, driver_name,
2110                         dev);
2111         if (retval != 0) {
2112                 DEBUG(KERN_ERR "%s: can't get irq %i, err %d\n", driver_name,
2113                       IRQ_USBINTR, retval);
2114                 return -EBUSY;
2115         }
2116
2117         create_proc_files();
2118
2119         return retval;
2120 }
2121
2122 static int lh7a40x_udc_remove(struct platform_device *pdev)
2123 {
2124         struct lh7a40x_udc *dev = platform_get_drvdata(pdev);
2125
2126         DEBUG("%s: %p\n", __FUNCTION__, pdev);
2127
2128         udc_disable(dev);
2129         remove_proc_files();
2130         usb_gadget_unregister_driver(dev->driver);
2131
2132         free_irq(IRQ_USBINTR, dev);
2133
2134         platform_set_drvdata(pdev, 0);
2135
2136         the_controller = 0;
2137
2138         return 0;
2139 }
2140
2141 /*-------------------------------------------------------------------------*/
2142
2143 static struct platform_driver udc_driver = {
2144         .probe = lh7a40x_udc_probe,
2145         .remove = lh7a40x_udc_remove,
2146             /* FIXME power management support */
2147             /* .suspend = ... disable UDC */
2148             /* .resume = ... re-enable UDC */
2149         .driver = {
2150                 .name = (char *)driver_name,
2151                 .owner = THIS_MODULE,
2152         },
2153 };
2154
2155 static int __init udc_init(void)
2156 {
2157         DEBUG("%s: %s version %s\n", __FUNCTION__, driver_name, DRIVER_VERSION);
2158         return platform_driver_register(&udc_driver);
2159 }
2160
2161 static void __exit udc_exit(void)
2162 {
2163         platform_driver_unregister(&udc_driver);
2164 }
2165
2166 module_init(udc_init);
2167 module_exit(udc_exit);
2168
2169 MODULE_DESCRIPTION(DRIVER_DESC);
2170 MODULE_AUTHOR("Mikko Lahteenmaki, Bo Henriksen");
2171 MODULE_LICENSE("GPL");