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->disconnect
 428                         || !driver->setup)
 429                 return -EINVAL;
 430         if (!dev)
 431                 return -ENODEV;
 432         if (dev->driver)
 433                 return -EBUSY;
 434
 435         /* first hook up the driver ... */
 436         dev->driver = driver;
 437         dev->gadget.dev.driver = &driver->driver;
 438
 439         device_add(&dev->gadget.dev);
 440         retval = driver->bind(&dev->gadget);
 441         if (retval) {
 442                 printk("%s: bind to driver %s --> error %d\n", dev->gadget.name,
 443                        driver->driver.name, retval);
 444                 device_del(&dev->gadget.dev);
 445
 446                 dev->driver = 0;
 447                 dev->gadget.dev.driver = 0;
 448                 return retval;
 449         }
 450
 451         /* ... then enable host detection and ep0; and we're ready
 452          * for set_configuration as well as eventual disconnect.
 453          * NOTE:  this shouldn't power up until later.
 454          */
 455         printk("%s: registered gadget driver '%s'\n", dev->gadget.name,
 456                driver->driver.name);
 457
 458         udc_enable(dev);
 459
 460         return 0;
 461 }
 462
 463 EXPORT_SYMBOL(usb_gadget_register_driver);
 464
 465 /*
 466   Unregister entry point for the peripheral controller driver.
 467 */
 468 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 469 {
 470         struct lh7a40x_udc *dev = the_controller;
 471         unsigned long flags;
 472
 473         if (!dev)
 474                 return -ENODEV;
 475         if (!driver || driver != dev->driver || !driver->unbind)
 476                 return -EINVAL;
 477
 478         spin_lock_irqsave(&dev->lock, flags);
 479         dev->driver = 0;
 480         stop_activity(dev, driver);
 481         spin_unlock_irqrestore(&dev->lock, flags);
 482
 483         driver->unbind(&dev->gadget);
 484         device_del(&dev->gadget.dev);
 485
 486         udc_disable(dev);
 487
 488         DEBUG("unregistered gadget driver '%s'\n", driver->driver.name);
 489         return 0;
 490 }
 491
 492 EXPORT_SYMBOL(usb_gadget_unregister_driver);
 493
 494 /*-------------------------------------------------------------------------*/
 495
 496 /** Write request to FIFO (max write == maxp size)
 497  *  Return:  0 = still running, 1 = completed, negative = errno
 498  *  NOTE: INDEX register must be set for EP
 499  */
 500 static int write_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
 501 {
 502         u32 max;
 503         u32 csr;
 504
 505         max = le16_to_cpu(ep->desc->wMaxPacketSize);
 506
 507         csr = usb_read(ep->csr1);
 508         DEBUG("CSR: %x %d\n", csr, csr & USB_IN_CSR1_FIFO_NOT_EMPTY);
 509
 510         if (!(csr & USB_IN_CSR1_FIFO_NOT_EMPTY)) {
 511                 unsigned count;
 512                 int is_last, is_short;
 513
 514                 count = write_packet(ep, req, max);
 515                 usb_set(USB_IN_CSR1_IN_PKT_RDY, ep->csr1);
 516
 517                 /* last packet is usually short (or a zlp) */
 518                 if (unlikely(count != max))
 519                         is_last = is_short = 1;
 520                 else {
 521                         if (likely(req->req.length != req->req.actual)
 522                             || req->req.zero)
 523                                 is_last = 0;
 524                         else
 525                                 is_last = 1;
 526                         /* interrupt/iso maxpacket may not fill the fifo */
 527                         is_short = unlikely(max < ep_maxpacket(ep));
 528                 }
 529
 530                 DEBUG("%s: wrote %s %d bytes%s%s %d left %p\n", __FUNCTION__,
 531                       ep->ep.name, count,
 532                       is_last ? "/L" : "", is_short ? "/S" : "",
 533                       req->req.length - req->req.actual, req);
 534
 535                 /* requests complete when all IN data is in the FIFO */
 536                 if (is_last) {
 537                         done(ep, req, 0);
 538                         if (list_empty(&ep->queue)) {
 539                                 pio_irq_disable(ep_index(ep));
 540                         }
 541                         return 1;
 542                 }
 543         } else {
 544                 DEBUG("Hmm.. %d ep FIFO is not empty!\n", ep_index(ep));
 545         }
 546
 547         return 0;
 548 }
 549
 550 /** Read to request from FIFO (max read == bytes in fifo)
 551  *  Return:  0 = still running, 1 = completed, negative = errno
 552  *  NOTE: INDEX register must be set for EP
 553  */
 554 static int read_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
 555 {
 556         u32 csr;
 557         u8 *buf;
 558         unsigned bufferspace, count, is_short;
 559         volatile u32 *fifo = (volatile u32 *)ep->fifo;
 560
 561         /* make sure there's a packet in the FIFO. */
 562         csr = usb_read(ep->csr1);
 563         if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY)) {
 564                 DEBUG("%s: Packet NOT ready!\n", __FUNCTION__);
 565                 return -EINVAL;
 566         }
 567
 568         buf = req->req.buf + req->req.actual;
 569         prefetchw(buf);
 570         bufferspace = req->req.length - req->req.actual;
 571
 572         /* read all bytes from this packet */
 573         count = usb_read(USB_OUT_FIFO_WC1);
 574         req->req.actual += min(count, bufferspace);
 575
 576         is_short = (count < ep->ep.maxpacket);
 577         DEBUG("read %s %02x, %d bytes%s req %p %d/%d\n",
 578               ep->ep.name, csr, count,
 579               is_short ? "/S" : "", req, req->req.actual, req->req.length);
 580
 581         while (likely(count-- != 0)) {
 582                 u8 byte = (u8) (*fifo & 0xff);
 583
 584                 if (unlikely(bufferspace == 0)) {
 585                         /* this happens when the driver's buffer
 586                          * is smaller than what the host sent.
 587                          * discard the extra data.
 588                          */
 589                         if (req->req.status != -EOVERFLOW)
 590                                 printk("%s overflow %d\n", ep->ep.name, count);
 591                         req->req.status = -EOVERFLOW;
 592                 } else {
 593                         *buf++ = byte;
 594                         bufferspace--;
 595                 }
 596         }
 597
 598         usb_clear(USB_OUT_CSR1_OUT_PKT_RDY, ep->csr1);
 599
 600         /* completion */
 601         if (is_short || req->req.actual == req->req.length) {
 602                 done(ep, req, 0);
 603                 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
 604
 605                 if (list_empty(&ep->queue))
 606                         pio_irq_disable(ep_index(ep));
 607                 return 1;
 608         }
 609
 610         /* finished that packet.  the next one may be waiting... */
 611         return 0;
 612 }
 613
 614 /*
 615  *      done - retire a request; caller blocked irqs
 616  *  INDEX register is preserved to keep same
 617  */
 618 static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req, int status)
 619 {
 620         unsigned int stopped = ep->stopped;
 621         u32 index;
 622
 623         DEBUG("%s, %p\n", __FUNCTION__, ep);
 624         list_del_init(&req->queue);
 625
 626         if (likely(req->req.status == -EINPROGRESS))
 627                 req->req.status = status;
 628         else
 629                 status = req->req.status;
 630
 631         if (status && status != -ESHUTDOWN)
 632                 DEBUG("complete %s req %p stat %d len %u/%u\n",
 633                       ep->ep.name, &req->req, status,
 634                       req->req.actual, req->req.length);
 635
 636         /* don't modify queue heads during completion callback */
 637         ep->stopped = 1;
 638         /* Read current index (completion may modify it) */
 639         index = usb_read(USB_INDEX);
 640
 641         spin_unlock(&ep->dev->lock);
 642         req->req.complete(&ep->ep, &req->req);
 643         spin_lock(&ep->dev->lock);
 644
 645         /* Restore index */
 646         usb_set_index(index);
 647         ep->stopped = stopped;
 648 }
 649
 650 /** Enable EP interrupt */
 651 static void pio_irq_enable(int ep)
 652 {
 653         DEBUG("%s: %d\n", __FUNCTION__, ep);
 654
 655         switch (ep) {
 656         case 1:
 657                 usb_set(USB_IN_INT_EP1, USB_IN_INT_EN);
 658                 break;
 659         case 2:
 660                 usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN);
 661                 break;
 662         case 3:
 663                 usb_set(USB_IN_INT_EP3, USB_IN_INT_EN);
 664                 break;
 665         default:
 666                 DEBUG("Unknown endpoint: %d\n", ep);
 667                 break;
 668         }
 669 }
 670
 671 /** Disable EP interrupt */
 672 static void pio_irq_disable(int ep)
 673 {
 674         DEBUG("%s: %d\n", __FUNCTION__, ep);
 675
 676         switch (ep) {
 677         case 1:
 678                 usb_clear(USB_IN_INT_EP1, USB_IN_INT_EN);
 679                 break;
 680         case 2:
 681                 usb_clear(USB_OUT_INT_EP2, USB_OUT_INT_EN);
 682                 break;
 683         case 3:
 684                 usb_clear(USB_IN_INT_EP3, USB_IN_INT_EN);
 685                 break;
 686         default:
 687                 DEBUG("Unknown endpoint: %d\n", ep);
 688                 break;
 689         }
 690 }
 691
 692 /*
 693  *      nuke - dequeue ALL requests
 694  */
 695 void nuke(struct lh7a40x_ep *ep, int status)
 696 {
 697         struct lh7a40x_request *req;
 698
 699         DEBUG("%s, %p\n", __FUNCTION__, ep);
 700
 701         /* Flush FIFO */
 702         flush(ep);
 703
 704         /* called with irqs blocked */
 705         while (!list_empty(&ep->queue)) {
 706                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
 707                 done(ep, req, status);
 708         }
 709
 710         /* Disable IRQ if EP is enabled (has descriptor) */
 711         if (ep->desc)
 712                 pio_irq_disable(ep_index(ep));
 713 }
 714
 715 /*
 716 void nuke_all(struct lh7a40x_udc *dev)
 717 {
 718         int n;
 719         for(n=0; n<UDC_MAX_ENDPOINTS; n++) {
 720                 struct lh7a40x_ep *ep = &dev->ep[n];
 721                 usb_set_index(n);
 722                 nuke(ep, 0);
 723         }
 724 }*/
 725
 726 /*
 727 static void flush_all(struct lh7a40x_udc *dev)
 728 {
 729         int n;
 730     for (n = 0; n < UDC_MAX_ENDPOINTS; n++)
 731     {
 732                 struct lh7a40x_ep *ep = &dev->ep[n];
 733                 flush(ep);
 734     }
 735 }
 736 */
 737
 738 /** Flush EP
 739  * NOTE: INDEX register must be set before this call
 740  */
 741 static void flush(struct lh7a40x_ep *ep)
 742 {
 743         DEBUG("%s, %p\n", __FUNCTION__, ep);
 744
 745         switch (ep->ep_type) {
 746         case ep_control:
 747                 /* check, by implication c.f. 15.1.2.11 */
 748                 break;
 749
 750         case ep_bulk_in:
 751         case ep_interrupt:
 752                 /* if(csr & USB_IN_CSR1_IN_PKT_RDY) */
 753                 usb_set(USB_IN_CSR1_FIFO_FLUSH, ep->csr1);
 754                 break;
 755
 756         case ep_bulk_out:
 757                 /* if(csr & USB_OUT_CSR1_OUT_PKT_RDY) */
 758                 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
 759                 break;
 760         }
 761 }
 762
 763 /**
 764  * lh7a40x_in_epn - handle IN interrupt
 765  */
 766 static void lh7a40x_in_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
 767 {
 768         u32 csr;
 769         struct lh7a40x_ep *ep = &dev->ep[ep_idx];
 770         struct lh7a40x_request *req;
 771
 772         usb_set_index(ep_idx);
 773
 774         csr = usb_read(ep->csr1);
 775         DEBUG("%s: %d, csr %x\n", __FUNCTION__, ep_idx, csr);
 776
 777         if (csr & USB_IN_CSR1_SENT_STALL) {
 778                 DEBUG("USB_IN_CSR1_SENT_STALL\n");
 779                 usb_set(USB_IN_CSR1_SENT_STALL /*|USB_IN_CSR1_SEND_STALL */ ,
 780                         ep->csr1);
 781                 return;
 782         }
 783
 784         if (!ep->desc) {
 785                 DEBUG("%s: NO EP DESC\n", __FUNCTION__);
 786                 return;
 787         }
 788
 789         if (list_empty(&ep->queue))
 790                 req = 0;
 791         else
 792                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
 793
 794         DEBUG("req: %p\n", req);
 795
 796         if (!req)
 797                 return;
 798
 799         write_fifo(ep, req);
 800 }
 801
 802 /* ********************************************************************************************* */
 803 /* Bulk OUT (recv)
 804  */
 805
 806 static void lh7a40x_out_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
 807 {
 808         struct lh7a40x_ep *ep = &dev->ep[ep_idx];
 809         struct lh7a40x_request *req;
 810
 811         DEBUG("%s: %d\n", __FUNCTION__, ep_idx);
 812
 813         usb_set_index(ep_idx);
 814
 815         if (ep->desc) {
 816                 u32 csr;
 817                 csr = usb_read(ep->csr1);
 818
 819                 while ((csr =
 820                         usb_read(ep->
 821                                  csr1)) & (USB_OUT_CSR1_OUT_PKT_RDY |
 822                                            USB_OUT_CSR1_SENT_STALL)) {
 823                         DEBUG("%s: %x\n", __FUNCTION__, csr);
 824
 825                         if (csr & USB_OUT_CSR1_SENT_STALL) {
 826                                 DEBUG("%s: stall sent, flush fifo\n",
 827                                       __FUNCTION__);
 828                                 /* usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1); */
 829                                 flush(ep);
 830                         } else if (csr & USB_OUT_CSR1_OUT_PKT_RDY) {
 831                                 if (list_empty(&ep->queue))
 832                                         req = 0;
 833                                 else
 834                                         req =
 835                                             list_entry(ep->queue.next,
 836                                                        struct lh7a40x_request,
 837                                                        queue);
 838
 839                                 if (!req) {
 840                                         printk("%s: NULL REQ %d\n",
 841                                                __FUNCTION__, ep_idx);
 842                                         flush(ep);
 843                                         break;
 844                                 } else {
 845                                         read_fifo(ep, req);
 846                                 }
 847                         }
 848
 849                 }
 850
 851         } else {
 852                 /* Throw packet away.. */
 853                 printk("%s: No descriptor?!?\n", __FUNCTION__);
 854                 flush(ep);
 855         }
 856 }
 857
 858 static void stop_activity(struct lh7a40x_udc *dev,
 859                           struct usb_gadget_driver *driver)
 860 {
 861         int i;
 862
 863         /* don't disconnect drivers more than once */
 864         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 865                 driver = 0;
 866         dev->gadget.speed = USB_SPEED_UNKNOWN;
 867
 868         /* prevent new request submissions, kill any outstanding requests  */
 869         for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
 870                 struct lh7a40x_ep *ep = &dev->ep[i];
 871                 ep->stopped = 1;
 872
 873                 usb_set_index(i);
 874                 nuke(ep, -ESHUTDOWN);
 875         }
 876
 877         /* report disconnect; the driver is already quiesced */
 878         if (driver) {
 879                 spin_unlock(&dev->lock);
 880                 driver->disconnect(&dev->gadget);
 881                 spin_lock(&dev->lock);
 882         }
 883
 884         /* re-init driver-visible data structures */
 885         udc_reinit(dev);
 886 }
 887
 888 /** Handle USB RESET interrupt
 889  */
 890 static void lh7a40x_reset_intr(struct lh7a40x_udc *dev)
 891 {
 892 #if 0                           /* def CONFIG_ARCH_LH7A404 */
 893         /* Does not work always... */
 894
 895         DEBUG("%s: %d\n", __FUNCTION__, dev->usb_address);
 896
 897         if (!dev->usb_address) {
 898                 /*usb_set(USB_RESET_IO, USB_RESET);
 899                    mdelay(5);
 900                    usb_clear(USB_RESET_IO, USB_RESET); */
 901                 return;
 902         }
 903         /* Put the USB controller into reset. */
 904         usb_set(USB_RESET_IO, USB_RESET);
 905
 906         /* Set Device ID to 0 */
 907         udc_set_address(dev, 0);
 908
 909         /* Let PLL2 settle down */
 910         mdelay(5);
 911
 912         /* Release the USB controller from reset */
 913         usb_clear(USB_RESET_IO, USB_RESET);
 914
 915         /* Re-enable UDC */
 916         udc_enable(dev);
 917
 918 #endif
 919         dev->gadget.speed = USB_SPEED_FULL;
 920 }
 921
 922 /*
 923  *      lh7a40x usb client interrupt handler.
 924  */
 925 static irqreturn_t lh7a40x_udc_irq(int irq, void *_dev)
 926 {
 927         struct lh7a40x_udc *dev = _dev;
 928
 929         DEBUG("\n\n");
 930
 931         spin_lock(&dev->lock);
 932
 933         for (;;) {
 934                 u32 intr_in = usb_read(USB_IN_INT);
 935                 u32 intr_out = usb_read(USB_OUT_INT);
 936                 u32 intr_int = usb_read(USB_INT);
 937
 938                 /* Test also against enable bits.. (lh7a40x errata).. Sigh.. */
 939                 u32 in_en = usb_read(USB_IN_INT_EN);
 940                 u32 out_en = usb_read(USB_OUT_INT_EN);
 941
 942                 if (!intr_out && !intr_in && !intr_int)
 943                         break;
 944
 945                 DEBUG("%s (on state %s)\n", __FUNCTION__,
 946                       state_names[dev->ep0state]);
 947                 DEBUG("intr_out = %x\n", intr_out);
 948                 DEBUG("intr_in  = %x\n", intr_in);
 949                 DEBUG("intr_int = %x\n", intr_int);
 950
 951                 if (intr_in) {
 952                         usb_write(intr_in, USB_IN_INT);
 953
 954                         if ((intr_in & USB_IN_INT_EP1)
 955                             && (in_en & USB_IN_INT_EP1)) {
 956                                 DEBUG("USB_IN_INT_EP1\n");
 957                                 lh7a40x_in_epn(dev, 1, intr_in);
 958                         }
 959                         if ((intr_in & USB_IN_INT_EP3)
 960                             && (in_en & USB_IN_INT_EP3)) {
 961                                 DEBUG("USB_IN_INT_EP3\n");
 962                                 lh7a40x_in_epn(dev, 3, intr_in);
 963                         }
 964                         if (intr_in & USB_IN_INT_EP0) {
 965                                 DEBUG("USB_IN_INT_EP0 (control)\n");
 966                                 lh7a40x_handle_ep0(dev, intr_in);
 967                         }
 968                 }
 969
 970                 if (intr_out) {
 971                         usb_write(intr_out, USB_OUT_INT);
 972
 973                         if ((intr_out & USB_OUT_INT_EP2)
 974                             && (out_en & USB_OUT_INT_EP2)) {
 975                                 DEBUG("USB_OUT_INT_EP2\n");
 976                                 lh7a40x_out_epn(dev, 2, intr_out);
 977                         }
 978                 }
 979
 980                 if (intr_int) {
 981                         usb_write(intr_int, USB_INT);
 982
 983                         if (intr_int & USB_INT_RESET_INT) {
 984                                 lh7a40x_reset_intr(dev);
 985                         }
 986
 987                         if (intr_int & USB_INT_RESUME_INT) {
 988                                 DEBUG("USB resume\n");
 989
 990                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
 991                                     && dev->driver
 992                                     && dev->driver->resume
 993                                     && is_usb_connected()) {
 994                                         dev->driver->resume(&dev->gadget);
 995                                 }
 996                         }
 997
 998                         if (intr_int & USB_INT_SUSPEND_INT) {
 999                                 DEBUG("USB suspend%s\n",
1000                                       is_usb_connected()? "" : "+disconnect");
1001                                 if (!is_usb_connected()) {
1002                                         stop_activity(dev, dev->driver);
1003                                 } else if (dev->gadget.speed !=
1004                                            USB_SPEED_UNKNOWN && dev->driver
1005                                            && dev->driver->suspend) {
1006                                         dev->driver->suspend(&dev->gadget);
1007                                 }
1008                         }
1009
1010                 }
1011         }
1012
1013         spin_unlock(&dev->lock);
1014
1015         return IRQ_HANDLED;
1016 }
1017
1018 static int lh7a40x_ep_enable(struct usb_ep *_ep,
1019                              const struct usb_endpoint_descriptor *desc)
1020 {
1021         struct lh7a40x_ep *ep;
1022         struct lh7a40x_udc *dev;
1023         unsigned long flags;
1024
1025         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1026
1027         ep = container_of(_ep, struct lh7a40x_ep, ep);
1028         if (!_ep || !desc || ep->desc || _ep->name == ep0name
1029             || desc->bDescriptorType != USB_DT_ENDPOINT
1030             || ep->bEndpointAddress != desc->bEndpointAddress
1031             || ep_maxpacket(ep) < le16_to_cpu(desc->wMaxPacketSize)) {
1032                 DEBUG("%s, bad ep or descriptor\n", __FUNCTION__);
1033                 return -EINVAL;
1034         }
1035
1036         /* xfer types must match, except that interrupt ~= bulk */
1037         if (ep->bmAttributes != desc->bmAttributes
1038             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
1039             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
1040                 DEBUG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
1041                 return -EINVAL;
1042         }
1043
1044         /* hardware _could_ do smaller, but driver doesn't */
1045         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
1046              && le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(ep))
1047             || !desc->wMaxPacketSize) {
1048                 DEBUG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
1049                 return -ERANGE;
1050         }
1051
1052         dev = ep->dev;
1053         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1054                 DEBUG("%s, bogus device state\n", __FUNCTION__);
1055                 return -ESHUTDOWN;
1056         }
1057
1058         spin_lock_irqsave(&ep->dev->lock, flags);
1059
1060         ep->stopped = 0;
1061         ep->desc = desc;
1062         ep->pio_irqs = 0;
1063         ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
1064
1065         spin_unlock_irqrestore(&ep->dev->lock, flags);
1066
1067         /* Reset halt state (does flush) */
1068         lh7a40x_set_halt(_ep, 0);
1069
1070         DEBUG("%s: enabled %s\n", __FUNCTION__, _ep->name);
1071         return 0;
1072 }
1073
1074 /** Disable EP
1075  *  NOTE: Sets INDEX register
1076  */
1077 static int lh7a40x_ep_disable(struct usb_ep *_ep)
1078 {
1079         struct lh7a40x_ep *ep;
1080         unsigned long flags;
1081
1082         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1083
1084         ep = container_of(_ep, struct lh7a40x_ep, ep);
1085         if (!_ep || !ep->desc) {
1086                 DEBUG("%s, %s not enabled\n", __FUNCTION__,
1087                       _ep ? ep->ep.name : NULL);
1088                 return -EINVAL;
1089         }
1090
1091         spin_lock_irqsave(&ep->dev->lock, flags);
1092
1093         usb_set_index(ep_index(ep));
1094
1095         /* Nuke all pending requests (does flush) */
1096         nuke(ep, -ESHUTDOWN);
1097
1098         /* Disable ep IRQ */
1099         pio_irq_disable(ep_index(ep));
1100
1101         ep->desc = 0;
1102         ep->stopped = 1;
1103
1104         spin_unlock_irqrestore(&ep->dev->lock, flags);
1105
1106         DEBUG("%s: disabled %s\n", __FUNCTION__, _ep->name);
1107         return 0;
1108 }
1109
1110 static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep,
1111                                                  gfp_t gfp_flags)
1112 {
1113         struct lh7a40x_request *req;
1114
1115         DEBUG("%s, %p\n", __FUNCTION__, ep);
1116
1117         req = kzalloc(sizeof(*req), gfp_flags);
1118         if (!req)
1119                 return 0;
1120
1121         INIT_LIST_HEAD(&req->queue);
1122
1123         return &req->req;
1124 }
1125
1126 static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *_req)
1127 {
1128         struct lh7a40x_request *req;
1129
1130         DEBUG("%s, %p\n", __FUNCTION__, ep);
1131
1132         req = container_of(_req, struct lh7a40x_request, req);
1133         WARN_ON(!list_empty(&req->queue));
1134         kfree(req);
1135 }
1136
1137 static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned bytes,
1138                                   dma_addr_t * dma, gfp_t gfp_flags)
1139 {
1140         char *retval;
1141
1142         DEBUG("%s (%p, %d, %d)\n", __FUNCTION__, ep, bytes, gfp_flags);
1143
1144         retval = kmalloc(bytes, gfp_flags & ~(__GFP_DMA | __GFP_HIGHMEM));
1145         if (retval)
1146                 *dma = virt_to_bus(retval);
1147         return retval;
1148 }
1149
1150 static void lh7a40x_free_buffer(struct usb_ep *ep, void *buf, dma_addr_t dma,
1151                                 unsigned bytes)
1152 {
1153         DEBUG("%s, %p\n", __FUNCTION__, ep);
1154         kfree(buf);
1155 }
1156
1157 /** Queue one request
1158  *  Kickstart transfer if needed
1159  *  NOTE: Sets INDEX register
1160  */
1161 static int lh7a40x_queue(struct usb_ep *_ep, struct usb_request *_req,
1162                          gfp_t gfp_flags)
1163 {
1164         struct lh7a40x_request *req;
1165         struct lh7a40x_ep *ep;
1166         struct lh7a40x_udc *dev;
1167         unsigned long flags;
1168
1169         DEBUG("\n\n\n%s, %p\n", __FUNCTION__, _ep);
1170
1171         req = container_of(_req, struct lh7a40x_request, req);
1172         if (unlikely
1173             (!_req || !_req->complete || !_req->buf
1174              || !list_empty(&req->queue))) {
1175                 DEBUG("%s, bad params\n", __FUNCTION__);
1176                 return -EINVAL;
1177         }
1178
1179         ep = container_of(_ep, struct lh7a40x_ep, ep);
1180         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1181                 DEBUG("%s, bad ep\n", __FUNCTION__);
1182                 return -EINVAL;
1183         }
1184
1185         dev = ep->dev;
1186         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
1187                 DEBUG("%s, bogus device state %p\n", __FUNCTION__, dev->driver);
1188                 return -ESHUTDOWN;
1189         }
1190
1191         DEBUG("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length,
1192               _req->buf);
1193
1194         spin_lock_irqsave(&dev->lock, flags);
1195
1196         _req->status = -EINPROGRESS;
1197         _req->actual = 0;
1198
1199         /* kickstart this i/o queue? */
1200         DEBUG("Add to %d Q %d %d\n", ep_index(ep), list_empty(&ep->queue),
1201               ep->stopped);
1202         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
1203                 u32 csr;
1204
1205                 if (unlikely(ep_index(ep) == 0)) {
1206                         /* EP0 */
1207                         list_add_tail(&req->queue, &ep->queue);
1208                         lh7a40x_ep0_kick(dev, ep);
1209                         req = 0;
1210                 } else if (ep_is_in(ep)) {
1211                         /* EP1 & EP3 */
1212                         usb_set_index(ep_index(ep));
1213                         csr = usb_read(ep->csr1);
1214                         pio_irq_enable(ep_index(ep));
1215                         if ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY) == 0) {
1216                                 if (write_fifo(ep, req) == 1)
1217                                         req = 0;
1218                         }
1219                 } else {
1220                         /* EP2 */
1221                         usb_set_index(ep_index(ep));
1222                         csr = usb_read(ep->csr1);
1223                         pio_irq_enable(ep_index(ep));
1224                         if (!(csr & USB_OUT_CSR1_FIFO_FULL)) {
1225                                 if (read_fifo(ep, req) == 1)
1226                                         req = 0;
1227                         }
1228                 }
1229         }
1230
1231         /* pio or dma irq handler advances the queue. */
1232         if (likely(req != 0))
1233                 list_add_tail(&req->queue, &ep->queue);
1234
1235         spin_unlock_irqrestore(&dev->lock, flags);
1236
1237         return 0;
1238 }
1239
1240 /* dequeue JUST ONE request */
1241 static int lh7a40x_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1242 {
1243         struct lh7a40x_ep *ep;
1244         struct lh7a40x_request *req;
1245         unsigned long flags;
1246
1247         DEBUG("%s, %p\n", __FUNCTION__, _ep);
1248
1249         ep = container_of(_ep, struct lh7a40x_ep, ep);
1250         if (!_ep || ep->ep.name == ep0name)
1251                 return -EINVAL;
1252
1253         spin_lock_irqsave(&ep->dev->lock, flags);
1254
1255         /* make sure it's actually queued on this endpoint */
1256         list_for_each_entry(req, &ep->queue, queue) {
1257                 if (&req->req == _req)
1258                         break;
1259         }
1260         if (&req->req != _req) {
1261                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1262                 return -EINVAL;
1263         }
1264
1265         done(ep, req, -ECONNRESET);
1266
1267         spin_unlock_irqrestore(&ep->dev->lock, flags);
1268         return 0;
1269 }
1270
1271 /** Halt specific EP
1272  *  Return 0 if success
1273  *  NOTE: Sets INDEX register to EP !
1274  */
1275 static int lh7a40x_set_halt(struct usb_ep *_ep, int value)
1276 {
1277         struct lh7a40x_ep *ep;
1278         unsigned long flags;
1279
1280         ep = container_of(_ep, struct lh7a40x_ep, ep);
1281         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1282                 DEBUG("%s, bad ep\n", __FUNCTION__);
1283                 return -EINVAL;
1284         }
1285
1286         usb_set_index(ep_index(ep));
1287
1288         DEBUG("%s, ep %d, val %d\n", __FUNCTION__, ep_index(ep), value);
1289
1290         spin_lock_irqsave(&ep->dev->lock, flags);
1291
1292         if (ep_index(ep) == 0) {
1293                 /* EP0 */
1294                 usb_set(EP0_SEND_STALL, ep->csr1);
1295         } else if (ep_is_in(ep)) {
1296                 u32 csr = usb_read(ep->csr1);
1297                 if (value && ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY)
1298                               || !list_empty(&ep->queue))) {
1299                         /*
1300                          * Attempts to halt IN endpoints will fail (returning -EAGAIN)
1301                          * if any transfer requests are still queued, or if the controller
1302                          * FIFO still holds bytes that the host hasn\92t collected.
1303                          */
1304                         spin_unlock_irqrestore(&ep->dev->lock, flags);
1305                         DEBUG
1306                             ("Attempt to halt IN endpoint failed (returning -EAGAIN) %d %d\n",
1307                              (csr & USB_IN_CSR1_FIFO_NOT_EMPTY),
1308                              !list_empty(&ep->queue));
1309                         return -EAGAIN;
1310                 }
1311                 flush(ep);
1312                 if (value)
1313                         usb_set(USB_IN_CSR1_SEND_STALL, ep->csr1);
1314                 else {
1315                         usb_clear(USB_IN_CSR1_SEND_STALL, ep->csr1);
1316                         usb_set(USB_IN_CSR1_CLR_DATA_TOGGLE, ep->csr1);
1317                 }
1318
1319         } else {
1320
1321                 flush(ep);
1322                 if (value)
1323                         usb_set(USB_OUT_CSR1_SEND_STALL, ep->csr1);
1324                 else {
1325                         usb_clear(USB_OUT_CSR1_SEND_STALL, ep->csr1);
1326                         usb_set(USB_OUT_CSR1_CLR_DATA_REG, ep->csr1);
1327                 }
1328         }
1329
1330         if (value) {
1331                 ep->stopped = 1;
1332         } else {
1333                 ep->stopped = 0;
1334         }
1335
1336         spin_unlock_irqrestore(&ep->dev->lock, flags);
1337
1338         DEBUG("%s %s halted\n", _ep->name, value == 0 ? "NOT" : "IS");
1339
1340         return 0;
1341 }
1342
1343 /** Return bytes in EP FIFO
1344  *  NOTE: Sets INDEX register to EP
1345  */
1346 static int lh7a40x_fifo_status(struct usb_ep *_ep)
1347 {
1348         u32 csr;
1349         int count = 0;
1350         struct lh7a40x_ep *ep;
1351
1352         ep = container_of(_ep, struct lh7a40x_ep, ep);
1353         if (!_ep) {
1354                 DEBUG("%s, bad ep\n", __FUNCTION__);
1355                 return -ENODEV;
1356         }
1357
1358         DEBUG("%s, %d\n", __FUNCTION__, ep_index(ep));
1359
1360         /* LPD can't report unclaimed bytes from IN fifos */
1361         if (ep_is_in(ep))
1362                 return -EOPNOTSUPP;
1363
1364         usb_set_index(ep_index(ep));
1365
1366         csr = usb_read(ep->csr1);
1367         if (ep->dev->gadget.speed != USB_SPEED_UNKNOWN ||
1368             csr & USB_OUT_CSR1_OUT_PKT_RDY) {
1369                 count = usb_read(USB_OUT_FIFO_WC1);
1370         }
1371
1372         return count;
1373 }
1374
1375 /** Flush EP FIFO
1376  *  NOTE: Sets INDEX register to EP
1377  */
1378 static void lh7a40x_fifo_flush(struct usb_ep *_ep)
1379 {
1380         struct lh7a40x_ep *ep;
1381
1382         ep = container_of(_ep, struct lh7a40x_ep, ep);
1383         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1384                 DEBUG("%s, bad ep\n", __FUNCTION__);
1385                 return;
1386         }
1387
1388         usb_set_index(ep_index(ep));
1389         flush(ep);
1390 }
1391
1392 /****************************************************************/
1393 /* End Point 0 related functions                                */
1394 /****************************************************************/
1395
1396 /* return:  0 = still running, 1 = completed, negative = errno */
1397 static int write_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
1398 {
1399         u32 max;
1400         unsigned count;
1401         int is_last;
1402
1403         max = ep_maxpacket(ep);
1404
1405         DEBUG_EP0("%s\n", __FUNCTION__);
1406
1407         count = write_packet(ep, req, max);
1408
1409         /* last packet is usually short (or a zlp) */
1410         if (unlikely(count != max))
1411                 is_last = 1;
1412         else {
1413                 if (likely(req->req.length != req->req.actual) || req->req.zero)
1414                         is_last = 0;
1415                 else
1416                         is_last = 1;
1417         }
1418
1419         DEBUG_EP0("%s: wrote %s %d bytes%s %d left %p\n", __FUNCTION__,
1420                   ep->ep.name, count,
1421                   is_last ? "/L" : "", req->req.length - req->req.actual, req);
1422
1423         /* requests complete when all IN data is in the FIFO */
1424         if (is_last) {
1425                 done(ep, req, 0);
1426                 return 1;
1427         }
1428
1429         return 0;
1430 }
1431
1432 static __inline__ int lh7a40x_fifo_read(struct lh7a40x_ep *ep,
1433                                         unsigned char *cp, int max)
1434 {
1435         int bytes;
1436         int count = usb_read(USB_OUT_FIFO_WC1);
1437         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1438
1439         if (count > max)
1440                 count = max;
1441         bytes = count;
1442         while (count--)
1443                 *cp++ = *fifo & 0xFF;
1444         return bytes;
1445 }
1446
1447 static __inline__ void lh7a40x_fifo_write(struct lh7a40x_ep *ep,
1448                                           unsigned char *cp, int count)
1449 {
1450         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1451         DEBUG_EP0("fifo_write: %d %d\n", ep_index(ep), count);
1452         while (count--)
1453                 *fifo = *cp++;
1454 }
1455
1456 static int read_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
1457 {
1458         u32 csr;
1459         u8 *buf;
1460         unsigned bufferspace, count, is_short;
1461         volatile u32 *fifo = (volatile u32 *)ep->fifo;
1462
1463         DEBUG_EP0("%s\n", __FUNCTION__);
1464
1465         csr = usb_read(USB_EP0_CSR);
1466         if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY))
1467                 return 0;
1468
1469         buf = req->req.buf + req->req.actual;
1470         prefetchw(buf);
1471         bufferspace = req->req.length - req->req.actual;
1472
1473         /* read all bytes from this packet */
1474         if (likely(csr & EP0_OUT_PKT_RDY)) {
1475                 count = usb_read(USB_OUT_FIFO_WC1);
1476                 req->req.actual += min(count, bufferspace);
1477         } else                  /* zlp */
1478                 count = 0;
1479
1480         is_short = (count < ep->ep.maxpacket);
1481         DEBUG_EP0("read %s %02x, %d bytes%s req %p %d/%d\n",
1482                   ep->ep.name, csr, count,
1483                   is_short ? "/S" : "", req, req->req.actual, req->req.length);
1484
1485         while (likely(count-- != 0)) {
1486                 u8 byte = (u8) (*fifo & 0xff);
1487
1488                 if (unlikely(bufferspace == 0)) {
1489                         /* this happens when the driver's buffer
1490                          * is smaller than what the host sent.
1491                          * discard the extra data.
1492                          */
1493                         if (req->req.status != -EOVERFLOW)
1494                                 DEBUG_EP0("%s overflow %d\n", ep->ep.name,
1495                                           count);
1496                         req->req.status = -EOVERFLOW;
1497                 } else {
1498                         *buf++ = byte;
1499                         bufferspace--;
1500                 }
1501         }
1502
1503         /* completion */
1504         if (is_short || req->req.actual == req->req.length) {
1505                 done(ep, req, 0);
1506                 return 1;
1507         }
1508
1509         /* finished that packet.  the next one may be waiting... */
1510         return 0;
1511 }
1512
1513 /**
1514  * udc_set_address - set the USB address for this device
1515  * @address:
1516  *
1517  * Called from control endpoint function after it decodes a set address setup packet.
1518  */
1519 static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address)
1520 {
1521         DEBUG_EP0("%s: %d\n", __FUNCTION__, address);
1522         /* c.f. 15.1.2.2 Table 15-4 address will be used after DATA_END is set */
1523         dev->usb_address = address;
1524         usb_set((address & USB_FA_FUNCTION_ADDR), USB_FA);
1525         usb_set(USB_FA_ADDR_UPDATE | (address & USB_FA_FUNCTION_ADDR), USB_FA);
1526         /* usb_read(USB_FA); */
1527 }
1528
1529 /*
1530  * DATA_STATE_RECV (OUT_PKT_RDY)
1531  *      - if error
1532  *              set EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL bits
1533  *      - else
1534  *              set EP0_CLR_OUT bit
1535                                 if last set EP0_DATA_END bit
1536  */
1537 static void lh7a40x_ep0_out(struct lh7a40x_udc *dev, u32 csr)
1538 {
1539         struct lh7a40x_request *req;
1540         struct lh7a40x_ep *ep = &dev->ep[0];
1541         int ret;
1542
1543         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1544
1545         if (list_empty(&ep->queue))
1546                 req = 0;
1547         else
1548                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
1549
1550         if (req) {
1551
1552                 if (req->req.length == 0) {
1553                         DEBUG_EP0("ZERO LENGTH OUT!\n");
1554                         usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1555                         dev->ep0state = WAIT_FOR_SETUP;
1556                         return;
1557                 }
1558                 ret = read_fifo_ep0(ep, req);
1559                 if (ret) {
1560                         /* Done! */
1561                         DEBUG_EP0("%s: finished, waiting for status\n",
1562                                   __FUNCTION__);
1563
1564                         usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1565                         dev->ep0state = WAIT_FOR_SETUP;
1566                 } else {
1567                         /* Not done yet.. */
1568                         DEBUG_EP0("%s: not finished\n", __FUNCTION__);
1569                         usb_set(EP0_CLR_OUT, USB_EP0_CSR);
1570                 }
1571         } else {
1572                 DEBUG_EP0("NO REQ??!\n");
1573         }
1574 }
1575
1576 /*
1577  * DATA_STATE_XMIT
1578  */
1579 static int lh7a40x_ep0_in(struct lh7a40x_udc *dev, u32 csr)
1580 {
1581         struct lh7a40x_request *req;
1582         struct lh7a40x_ep *ep = &dev->ep[0];
1583         int ret, need_zlp = 0;
1584
1585         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1586
1587         if (list_empty(&ep->queue))
1588                 req = 0;
1589         else
1590                 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
1591
1592         if (!req) {
1593                 DEBUG_EP0("%s: NULL REQ\n", __FUNCTION__);
1594                 return 0;
1595         }
1596
1597         if (req->req.length == 0) {
1598
1599                 usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1600                 dev->ep0state = WAIT_FOR_SETUP;
1601                 return 1;
1602         }
1603
1604         if (req->req.length - req->req.actual == EP0_PACKETSIZE) {
1605                 /* Next write will end with the packet size, */
1606                 /* so we need Zero-length-packet */
1607                 need_zlp = 1;
1608         }
1609
1610         ret = write_fifo_ep0(ep, req);
1611
1612         if (ret == 1 && !need_zlp) {
1613                 /* Last packet */
1614                 DEBUG_EP0("%s: finished, waiting for status\n", __FUNCTION__);
1615
1616                 usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1617                 dev->ep0state = WAIT_FOR_SETUP;
1618         } else {
1619                 DEBUG_EP0("%s: not finished\n", __FUNCTION__);
1620                 usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
1621         }
1622
1623         if (need_zlp) {
1624                 DEBUG_EP0("%s: Need ZLP!\n", __FUNCTION__);
1625                 usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
1626                 dev->ep0state = DATA_STATE_NEED_ZLP;
1627         }
1628
1629         return 1;
1630 }
1631
1632 static int lh7a40x_handle_get_status(struct lh7a40x_udc *dev,
1633                                      struct usb_ctrlrequest *ctrl)
1634 {
1635         struct lh7a40x_ep *ep0 = &dev->ep[0];
1636         struct lh7a40x_ep *qep;
1637         int reqtype = (ctrl->bRequestType & USB_RECIP_MASK);
1638         u16 val = 0;
1639
1640         if (reqtype == USB_RECIP_INTERFACE) {
1641                 /* This is not supported.
1642                  * And according to the USB spec, this one does nothing..
1643                  * Just return 0
1644                  */
1645                 DEBUG_SETUP("GET_STATUS: USB_RECIP_INTERFACE\n");
1646         } else if (reqtype == USB_RECIP_DEVICE) {
1647                 DEBUG_SETUP("GET_STATUS: USB_RECIP_DEVICE\n");
1648                 val |= (1 << 0);        /* Self powered */
1649                 /*val |= (1<<1); *//* Remote wakeup */
1650         } else if (reqtype == USB_RECIP_ENDPOINT) {
1651                 int ep_num = (ctrl->wIndex & ~USB_DIR_IN);
1652
1653                 DEBUG_SETUP
1654                     ("GET_STATUS: USB_RECIP_ENDPOINT (%d), ctrl->wLength = %d\n",
1655                      ep_num, ctrl->wLength);
1656
1657                 if (ctrl->wLength > 2 || ep_num > 3)
1658                         return -EOPNOTSUPP;
1659
1660                 qep = &dev->ep[ep_num];
1661                 if (ep_is_in(qep) != ((ctrl->wIndex & USB_DIR_IN) ? 1 : 0)
1662                     && ep_index(qep) != 0) {
1663                         return -EOPNOTSUPP;
1664                 }
1665
1666                 usb_set_index(ep_index(qep));
1667
1668                 /* Return status on next IN token */
1669                 switch (qep->ep_type) {
1670                 case ep_control:
1671                         val =
1672                             (usb_read(qep->csr1) & EP0_SEND_STALL) ==
1673                             EP0_SEND_STALL;
1674                         break;
1675                 case ep_bulk_in:
1676                 case ep_interrupt:
1677                         val =
1678                             (usb_read(qep->csr1) & USB_IN_CSR1_SEND_STALL) ==
1679                             USB_IN_CSR1_SEND_STALL;
1680                         break;
1681                 case ep_bulk_out:
1682                         val =
1683                             (usb_read(qep->csr1) & USB_OUT_CSR1_SEND_STALL) ==
1684                             USB_OUT_CSR1_SEND_STALL;
1685                         break;
1686                 }
1687
1688                 /* Back to EP0 index */
1689                 usb_set_index(0);
1690
1691                 DEBUG_SETUP("GET_STATUS, ep: %d (%x), val = %d\n", ep_num,
1692                             ctrl->wIndex, val);
1693         } else {
1694                 DEBUG_SETUP("Unknown REQ TYPE: %d\n", reqtype);
1695                 return -EOPNOTSUPP;
1696         }
1697
1698         /* Clear "out packet ready" */
1699         usb_set((EP0_CLR_OUT), USB_EP0_CSR);
1700         /* Put status to FIFO */
1701         lh7a40x_fifo_write(ep0, (u8 *) & val, sizeof(val));
1702         /* Issue "In packet ready" */
1703         usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1704
1705         return 0;
1706 }
1707
1708 /*
1709  * WAIT_FOR_SETUP (OUT_PKT_RDY)
1710  *      - read data packet from EP0 FIFO
1711  *      - decode command
1712  *      - if error
1713  *              set EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL bits
1714  *      - else
1715  *              set EP0_CLR_OUT | EP0_DATA_END bits
1716  */
1717 static void lh7a40x_ep0_setup(struct lh7a40x_udc *dev, u32 csr)
1718 {
1719         struct lh7a40x_ep *ep = &dev->ep[0];
1720         struct usb_ctrlrequest ctrl;
1721         int i, bytes, is_in;
1722
1723         DEBUG_SETUP("%s: %x\n", __FUNCTION__, csr);
1724
1725         /* Nuke all previous transfers */
1726         nuke(ep, -EPROTO);
1727
1728         /* read control req from fifo (8 bytes) */
1729         bytes = lh7a40x_fifo_read(ep, (unsigned char *)&ctrl, 8);
1730
1731         DEBUG_SETUP("Read CTRL REQ %d bytes\n", bytes);
1732         DEBUG_SETUP("CTRL.bRequestType = %d (is_in %d)\n", ctrl.bRequestType,
1733                     ctrl.bRequestType == USB_DIR_IN);
1734         DEBUG_SETUP("CTRL.bRequest = %d\n", ctrl.bRequest);
1735         DEBUG_SETUP("CTRL.wLength = %d\n", ctrl.wLength);
1736         DEBUG_SETUP("CTRL.wValue = %d (%d)\n", ctrl.wValue, ctrl.wValue >> 8);
1737         DEBUG_SETUP("CTRL.wIndex = %d\n", ctrl.wIndex);
1738
1739         /* Set direction of EP0 */
1740         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1741                 ep->bEndpointAddress |= USB_DIR_IN;
1742                 is_in = 1;
1743         } else {
1744                 ep->bEndpointAddress &= ~USB_DIR_IN;
1745                 is_in = 0;
1746         }
1747
1748         dev->req_pending = 1;
1749
1750         /* Handle some SETUP packets ourselves */
1751         switch (ctrl.bRequest) {
1752         case USB_REQ_SET_ADDRESS:
1753                 if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
1754                         break;
1755
1756                 DEBUG_SETUP("USB_REQ_SET_ADDRESS (%d)\n", ctrl.wValue);
1757                 udc_set_address(dev, ctrl.wValue);
1758                 usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
1759                 return;
1760
1761         case USB_REQ_GET_STATUS:{
1762                         if (lh7a40x_handle_get_status(dev, &ctrl) == 0)
1763                                 return;
1764
1765         case USB_REQ_CLEAR_FEATURE:
1766         case USB_REQ_SET_FEATURE:
1767                         if (ctrl.bRequestType == USB_RECIP_ENDPOINT) {
1768                                 struct lh7a40x_ep *qep;
1769                                 int ep_num = (ctrl.wIndex & 0x0f);
1770
1771                                 /* Support only HALT feature */
1772                                 if (ctrl.wValue != 0 || ctrl.wLength != 0
1773                                     || ep_num > 3 || ep_num < 1)
1774                                         break;
1775
1776                                 qep = &dev->ep[ep_num];
1777                                 spin_unlock(&dev->lock);
1778                                 if (ctrl.bRequest == USB_REQ_SET_FEATURE) {
1779                                         DEBUG_SETUP("SET_FEATURE (%d)\n",
1780                                                     ep_num);
1781                                         lh7a40x_set_halt(&qep->ep, 1);
1782                                 } else {
1783                                         DEBUG_SETUP("CLR_FEATURE (%d)\n",
1784                                                     ep_num);
1785                                         lh7a40x_set_halt(&qep->ep, 0);
1786                                 }
1787                                 spin_lock(&dev->lock);
1788                                 usb_set_index(0);
1789
1790                                 /* Reply with a ZLP on next IN token */
1791                                 usb_set((EP0_CLR_OUT | EP0_DATA_END),
1792                                         USB_EP0_CSR);
1793                                 return;
1794                         }
1795                         break;
1796                 }
1797
1798         default:
1799                 break;
1800         }
1801
1802         if (likely(dev->driver)) {
1803                 /* device-2-host (IN) or no data setup command, process immediately */
1804                 spin_unlock(&dev->lock);
1805                 i = dev->driver->setup(&dev->gadget, &ctrl);
1806                 spin_lock(&dev->lock);
1807
1808                 if (i < 0) {
1809                         /* setup processing failed, force stall */
1810                         DEBUG_SETUP
1811                             ("  --> ERROR: gadget setup FAILED (stalling), setup returned %d\n",
1812                              i);
1813                         usb_set_index(0);
1814                         usb_set((EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL),
1815                                 USB_EP0_CSR);
1816
1817                         /* ep->stopped = 1; */
1818                         dev->ep0state = WAIT_FOR_SETUP;
1819                 }
1820         }
1821 }
1822
1823 /*
1824  * DATA_STATE_NEED_ZLP
1825  */
1826 static void lh7a40x_ep0_in_zlp(struct lh7a40x_udc *dev, u32 csr)
1827 {
1828         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1829
1830         /* c.f. Table 15-14 */
1831         usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
1832         dev->ep0state = WAIT_FOR_SETUP;
1833 }
1834
1835 /*
1836  * handle ep0 interrupt
1837  */
1838 static void lh7a40x_handle_ep0(struct lh7a40x_udc *dev, u32 intr)
1839 {
1840         struct lh7a40x_ep *ep = &dev->ep[0];
1841         u32 csr;
1842
1843         /* Set index 0 */
1844         usb_set_index(0);
1845         csr = usb_read(USB_EP0_CSR);
1846
1847         DEBUG_EP0("%s: csr = %x\n", __FUNCTION__, csr);
1848
1849         /*
1850          * For overview of what we should be doing see c.f. Chapter 18.1.2.4
1851          * We will follow that outline here modified by our own global state
1852          * indication which provides hints as to what we think should be
1853          * happening..
1854          */
1855
1856         /*
1857          * if SENT_STALL is set
1858          *      - clear the SENT_STALL bit
1859          */
1860         if (csr & EP0_SENT_STALL) {
1861                 DEBUG_EP0("%s: EP0_SENT_STALL is set: %x\n", __FUNCTION__, csr);
1862                 usb_clear((EP0_SENT_STALL | EP0_SEND_STALL), USB_EP0_CSR);
1863                 nuke(ep, -ECONNABORTED);
1864                 dev->ep0state = WAIT_FOR_SETUP;
1865                 return;
1866         }
1867
1868         /*
1869          * if a transfer is in progress && IN_PKT_RDY and OUT_PKT_RDY are clear
1870          *      - fill EP0 FIFO
1871          *      - if last packet
1872          *      -       set IN_PKT_RDY | DATA_END
1873          *      - else
1874          *              set IN_PKT_RDY
1875          */
1876         if (!(csr & (EP0_IN_PKT_RDY | EP0_OUT_PKT_RDY))) {
1877                 DEBUG_EP0("%s: IN_PKT_RDY and OUT_PKT_RDY are clear\n",
1878                           __FUNCTION__);
1879
1880                 switch (dev->ep0state) {
1881                 case DATA_STATE_XMIT:
1882                         DEBUG_EP0("continue with DATA_STATE_XMIT\n");
1883                         lh7a40x_ep0_in(dev, csr);
1884                         return;
1885                 case DATA_STATE_NEED_ZLP:
1886                         DEBUG_EP0("continue with DATA_STATE_NEED_ZLP\n");
1887                         lh7a40x_ep0_in_zlp(dev, csr);
1888                         return;
1889                 default:
1890                         /* Stall? */
1891                         DEBUG_EP0("Odd state!! state = %s\n",
1892                                   state_names[dev->ep0state]);
1893                         dev->ep0state = WAIT_FOR_SETUP;
1894                         /* nuke(ep, 0); */
1895                         /* usb_set(EP0_SEND_STALL, ep->csr1); */
1896                         break;
1897                 }
1898         }
1899
1900         /*
1901          * if SETUP_END is set
1902          *      - abort the last transfer
1903          *      - set SERVICED_SETUP_END_BIT
1904          */
1905         if (csr & EP0_SETUP_END) {
1906                 DEBUG_EP0("%s: EP0_SETUP_END is set: %x\n", __FUNCTION__, csr);
1907
1908                 usb_set(EP0_CLR_SETUP_END, USB_EP0_CSR);
1909
1910                 nuke(ep, 0);
1911                 dev->ep0state = WAIT_FOR_SETUP;
1912         }
1913
1914         /*
1915          * if EP0_OUT_PKT_RDY is set
1916          *      - read data packet from EP0 FIFO
1917          *      - decode command
1918          *      - if error
1919          *              set SERVICED_OUT_PKT_RDY | DATA_END bits | SEND_STALL
1920          *      - else
1921          *              set SERVICED_OUT_PKT_RDY | DATA_END bits
1922          */
1923         if (csr & EP0_OUT_PKT_RDY) {
1924
1925                 DEBUG_EP0("%s: EP0_OUT_PKT_RDY is set: %x\n", __FUNCTION__,
1926                           csr);
1927
1928                 switch (dev->ep0state) {
1929                 case WAIT_FOR_SETUP:
1930                         DEBUG_EP0("WAIT_FOR_SETUP\n");
1931                         lh7a40x_ep0_setup(dev, csr);
1932                         break;
1933
1934                 case DATA_STATE_RECV:
1935                         DEBUG_EP0("DATA_STATE_RECV\n");
1936                         lh7a40x_ep0_out(dev, csr);
1937                         break;
1938
1939                 default:
1940                         /* send stall? */
1941                         DEBUG_EP0("strange state!! 2. send stall? state = %d\n",
1942                                   dev->ep0state);
1943                         break;
1944                 }
1945         }
1946 }
1947
1948 static void lh7a40x_ep0_kick(struct lh7a40x_udc *dev, struct lh7a40x_ep *ep)
1949 {
1950         u32 csr;
1951
1952         usb_set_index(0);
1953         csr = usb_read(USB_EP0_CSR);
1954
1955         DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
1956
1957         /* Clear "out packet ready" */
1958         usb_set(EP0_CLR_OUT, USB_EP0_CSR);
1959
1960         if (ep_is_in(ep)) {
1961                 dev->ep0state = DATA_STATE_XMIT;
1962                 lh7a40x_ep0_in(dev, csr);
1963         } else {
1964                 dev->ep0state = DATA_STATE_RECV;
1965                 lh7a40x_ep0_out(dev, csr);
1966         }
1967 }
1968
1969 /* ---------------------------------------------------------------------------
1970  *      device-scoped parts of the api to the usb controller hardware
1971  * ---------------------------------------------------------------------------
1972  */
1973
1974 static int lh7a40x_udc_get_frame(struct usb_gadget *_gadget)
1975 {
1976         u32 frame1 = usb_read(USB_FRM_NUM1);    /* Least significant 8 bits */
1977         u32 frame2 = usb_read(USB_FRM_NUM2);    /* Most significant 3 bits */
1978         DEBUG("%s, %p\n", __FUNCTION__, _gadget);
1979         return ((frame2 & 0x07) << 8) | (frame1 & 0xff);
1980 }
1981
1982 static int lh7a40x_udc_wakeup(struct usb_gadget *_gadget)
1983 {
1984         /* host may not have enabled remote wakeup */
1985         /*if ((UDCCS0 & UDCCS0_DRWF) == 0)
1986            return -EHOSTUNREACH;
1987            udc_set_mask_UDCCR(UDCCR_RSM); */
1988         return -ENOTSUPP;
1989 }
1990
1991 static const struct usb_gadget_ops lh7a40x_udc_ops = {
1992         .get_frame = lh7a40x_udc_get_frame,
1993         .wakeup = lh7a40x_udc_wakeup,
1994         /* current versions must always be self-powered */
1995 };
1996
1997 static void nop_release(struct device *dev)
1998 {
1999         DEBUG("%s %s\n", __FUNCTION__, dev->bus_id);
2000 }
2001
2002 static struct lh7a40x_udc memory = {
2003         .usb_address = 0,
2004
2005         .gadget = {
2006                    .ops = &lh7a40x_udc_ops,
2007                    .ep0 = &memory.ep[0].ep,
2008                    .name = driver_name,
2009                    .dev = {
2010                            .bus_id = "gadget",
2011                            .release = nop_release,
2012                            },
2013                    },
2014
2015         /* control endpoint */
2016         .ep[0] = {
2017                   .ep = {
2018                          .name = ep0name,
2019                          .ops = &lh7a40x_ep_ops,
2020                          .maxpacket = EP0_PACKETSIZE,
2021                          },
2022                   .dev = &memory,
2023
2024                   .bEndpointAddress = 0,
2025                   .bmAttributes = 0,
2026
2027                   .ep_type = ep_control,
2028                   .fifo = io_p2v(USB_EP0_FIFO),
2029                   .csr1 = USB_EP0_CSR,
2030                   .csr2 = USB_EP0_CSR,
2031                   },
2032
2033         /* first group of endpoints */
2034         .ep[1] = {
2035                   .ep = {
2036                          .name = "ep1in-bulk",
2037                          .ops = &lh7a40x_ep_ops,
2038                          .maxpacket = 64,
2039                          },
2040                   .dev = &memory,
2041
2042                   .bEndpointAddress = USB_DIR_IN | 1,
2043                   .bmAttributes = USB_ENDPOINT_XFER_BULK,
2044
2045                   .ep_type = ep_bulk_in,
2046                   .fifo = io_p2v(USB_EP1_FIFO),
2047                   .csr1 = USB_IN_CSR1,
2048                   .csr2 = USB_IN_CSR2,
2049                   },
2050
2051         .ep[2] = {
2052                   .ep = {
2053                          .name = "ep2out-bulk",
2054                          .ops = &lh7a40x_ep_ops,
2055                          .maxpacket = 64,
2056                          },
2057                   .dev = &memory,
2058
2059                   .bEndpointAddress = 2,
2060                   .bmAttributes = USB_ENDPOINT_XFER_BULK,
2061
2062                   .ep_type = ep_bulk_out,
2063                   .fifo = io_p2v(USB_EP2_FIFO),
2064                   .csr1 = USB_OUT_CSR1,
2065                   .csr2 = USB_OUT_CSR2,
2066                   },
2067
2068         .ep[3] = {
2069                   .ep = {
2070                          .name = "ep3in-int",
2071                          .ops = &lh7a40x_ep_ops,
2072                          .maxpacket = 64,
2073                          },
2074                   .dev = &memory,
2075
2076                   .bEndpointAddress = USB_DIR_IN | 3,
2077                   .bmAttributes = USB_ENDPOINT_XFER_INT,
2078
2079                   .ep_type = ep_interrupt,
2080                   .fifo = io_p2v(USB_EP3_FIFO),
2081                   .csr1 = USB_IN_CSR1,
2082                   .csr2 = USB_IN_CSR2,
2083                   },
2084 };
2085
2086 /*
2087  *      probe - binds to the platform device
2088  */
2089 static int lh7a40x_udc_probe(struct platform_device *pdev)
2090 {
2091         struct lh7a40x_udc *dev = &memory;
2092         int retval;
2093
2094         DEBUG("%s: %p\n", __FUNCTION__, pdev);
2095
2096         spin_lock_init(&dev->lock);
2097         dev->dev = &pdev->dev;
2098
2099         device_initialize(&dev->gadget.dev);
2100         dev->gadget.dev.parent = &pdev->dev;
2101
2102         the_controller = dev;
2103         platform_set_drvdata(pdev, dev);
2104
2105         udc_disable(dev);
2106         udc_reinit(dev);
2107
2108         /* irq setup after old hardware state is cleaned up */
2109         retval =
2110             request_irq(IRQ_USBINTR, lh7a40x_udc_irq, IRQF_DISABLED, driver_name,
2111                         dev);
2112         if (retval != 0) {
2113                 DEBUG(KERN_ERR "%s: can't get irq %i, err %d\n", driver_name,
2114                       IRQ_USBINTR, retval);
2115                 return -EBUSY;
2116         }
2117
2118         create_proc_files();
2119
2120         return retval;
2121 }
2122
2123 static int lh7a40x_udc_remove(struct platform_device *pdev)
2124 {
2125         struct lh7a40x_udc *dev = platform_get_drvdata(pdev);
2126
2127         DEBUG("%s: %p\n", __FUNCTION__, pdev);
2128
2129         if (dev->driver)
2130                 return -EBUSY;
2131
2132         udc_disable(dev);
2133         remove_proc_files();
2134
2135         free_irq(IRQ_USBINTR, dev);
2136
2137         platform_set_drvdata(pdev, 0);
2138
2139         the_controller = 0;
2140
2141         return 0;
2142 }
2143
2144 /*-------------------------------------------------------------------------*/
2145
2146 static struct platform_driver udc_driver = {
2147         .probe = lh7a40x_udc_probe,
2148         .remove = lh7a40x_udc_remove,
2149             /* FIXME power management support */
2150             /* .suspend = ... disable UDC */
2151             /* .resume = ... re-enable UDC */
2152         .driver = {
2153                 .name = (char *)driver_name,
2154                 .owner = THIS_MODULE,
2155         },
2156 };
2157
2158 static int __init udc_init(void)
2159 {
2160         DEBUG("%s: %s version %s\n", __FUNCTION__, driver_name, DRIVER_VERSION);
2161         return platform_driver_register(&udc_driver);
2162 }
2163
2164 static void __exit udc_exit(void)
2165 {
2166         platform_driver_unregister(&udc_driver);
2167 }
2168
2169 module_init(udc_init);
2170 module_exit(udc_exit);
2171
2172 MODULE_DESCRIPTION(DRIVER_DESC);
2173 MODULE_AUTHOR("Mikko Lahteenmaki, Bo Henriksen");
2174 MODULE_LICENSE("GPL");