drivers/usb/gadget/net2280.c

   1 /*
   2  * Driver for the PLX NET2280 USB device controller.
   3  * Specs and errata are available from <http://www.plxtech.com>.
   4  *
   5  * PLX Technology Inc. (formerly NetChip Technology) supported the
   6  * development of this driver.
   7  *
   8  *
   9  * CODE STATUS HIGHLIGHTS
  10  *
  11  * This driver should work well with most "gadget" drivers, including
  12  * the File Storage, Serial, and Ethernet/RNDIS gadget drivers
  13  * as well as Gadget Zero and Gadgetfs.
  14  *
  15  * DMA is enabled by default.  Drivers using transfer queues might use
  16  * DMA chaining to remove IRQ latencies between transfers.  (Except when
  17  * short OUT transfers happen.)  Drivers can use the req->no_interrupt
  18  * hint to completely eliminate some IRQs, if a later IRQ is guaranteed
  19  * and DMA chaining is enabled.
  20  *
  21  * Note that almost all the errata workarounds here are only needed for
  22  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  23  */
  24
  25 /*
  26  * Copyright (C) 2003 David Brownell
  27  * Copyright (C) 2003-2005 PLX Technology, Inc.
  28  *
  29  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  30  *      with 2282 chip
  31  *
  32  * This program is free software; you can redistribute it and/or modify
  33  * it under the terms of the GNU General Public License as published by
  34  * the Free Software Foundation; either version 2 of the License, or
  35  * (at your option) any later version.
  36  *
  37  * This program is distributed in the hope that it will be useful,
  38  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  39  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  40  * GNU General Public License for more details.
  41  *
  42  * You should have received a copy of the GNU General Public License
  43  * along with this program; if not, write to the Free Software
  44  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  45  */
  46
  47 #undef  DEBUG           /* messages on error and most fault paths */
  48 #undef  VERBOSE         /* extra debug messages (success too) */
  49
  50 #include <linux/module.h>
  51 #include <linux/pci.h>
  52 #include <linux/dma-mapping.h>
  53 #include <linux/kernel.h>
  54 #include <linux/delay.h>
  55 #include <linux/ioport.h>
  56 #include <linux/slab.h>
  57 #include <linux/errno.h>
  58 #include <linux/init.h>
  59 #include <linux/timer.h>
  60 #include <linux/list.h>
  61 #include <linux/interrupt.h>
  62 #include <linux/moduleparam.h>
  63 #include <linux/device.h>
  64 #include <linux/usb/ch9.h>
  65 #include <linux/usb/gadget.h>
  66 #include <linux/prefetch.h>
  67
  68 #include <asm/byteorder.h>
  69 #include <asm/io.h>
  70 #include <asm/irq.h>
  71 #include <asm/system.h>
  72 #include <asm/unaligned.h>
  73
  74
  75 #define DRIVER_DESC             "PLX NET228x USB Peripheral Controller"
  76 #define DRIVER_VERSION          "2005 Sept 27"
  77
  78 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  79 #define EP_DONTUSE              13      /* nonzero */
  80
  81 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  82
  83
  84 static const char driver_name [] = "net2280";
  85 static const char driver_desc [] = DRIVER_DESC;
  86
  87 static const char ep0name [] = "ep0";
  88 static const char *const ep_name [] = {
  89         ep0name,
  90         "ep-a", "ep-b", "ep-c", "ep-d",
  91         "ep-e", "ep-f",
  92 };
  93
  94 /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
  95  * use_dma_chaining -- dma descriptor queueing gives even more irq reduction
  96  *
  97  * The net2280 DMA engines are not tightly integrated with their FIFOs;
  98  * not all cases are (yet) handled well in this driver or the silicon.
  99  * Some gadget drivers work better with the dma support here than others.
 100  * These two parameters let you use PIO or more aggressive DMA.
 101  */
 102 static int use_dma = 1;
 103 static int use_dma_chaining = 0;
 104
 105 /* "modprobe net2280 use_dma=n" etc */
 106 module_param (use_dma, bool, S_IRUGO);
 107 module_param (use_dma_chaining, bool, S_IRUGO);
 108
 109
 110 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 111  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 112  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 113  */
 114 static ushort fifo_mode = 0;
 115
 116 /* "modprobe net2280 fifo_mode=1" etc */
 117 module_param (fifo_mode, ushort, 0644);
 118
 119 /* enable_suspend -- When enabled, the driver will respond to
 120  * USB suspend requests by powering down the NET2280.  Otherwise,
 121  * USB suspend requests will be ignored.  This is acceptable for
 122  * self-powered devices
 123  */
 124 static int enable_suspend = 0;
 125
 126 /* "modprobe net2280 enable_suspend=1" etc */
 127 module_param (enable_suspend, bool, S_IRUGO);
 128
 129
 130 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 131
 132 #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
 133 static char *type_string (u8 bmAttributes)
 134 {
 135         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 136         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 137         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 138         case USB_ENDPOINT_XFER_INT:     return "intr";
 139         };
 140         return "control";
 141 }
 142 #endif
 143
 144 #include "net2280.h"
 145
 146 #define valid_bit       cpu_to_le32 (1 << VALID_BIT)
 147 #define dma_done_ie     cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
 148
 149 /*-------------------------------------------------------------------------*/
 150
 151 static int
 152 net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 153 {
 154         struct net2280          *dev;
 155         struct net2280_ep       *ep;
 156         u32                     max, tmp;
 157         unsigned long           flags;
 158
 159         ep = container_of (_ep, struct net2280_ep, ep);
 160         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 161                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 162                 return -EINVAL;
 163         dev = ep->dev;
 164         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 165                 return -ESHUTDOWN;
 166
 167         /* erratum 0119 workaround ties up an endpoint number */
 168         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
 169                 return -EDOM;
 170
 171         /* sanity check ep-e/ep-f since their fifos are small */
 172         max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff;
 173         if (ep->num > 4 && max > 64)
 174                 return -ERANGE;
 175
 176         spin_lock_irqsave (&dev->lock, flags);
 177         _ep->maxpacket = max & 0x7ff;
 178         ep->desc = desc;
 179
 180         /* ep_reset() has already been called */
 181         ep->stopped = 0;
 182         ep->wedged = 0;
 183         ep->out_overflow = 0;
 184
 185         /* set speed-dependent max packet; may kick in high bandwidth */
 186         set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
 187
 188         /* FIFO lines can't go to different packets.  PIO is ok, so
 189          * use it instead of troublesome (non-bulk) multi-packet DMA.
 190          */
 191         if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
 192                 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
 193                         ep->ep.name, ep->ep.maxpacket);
 194                 ep->dma = NULL;
 195         }
 196
 197         /* set type, direction, address; reset fifo counters */
 198         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
 199         tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 200         if (tmp == USB_ENDPOINT_XFER_INT) {
 201                 /* erratum 0105 workaround prevents hs NYET */
 202                 if (dev->chiprev == 0100
 203                                 && dev->gadget.speed == USB_SPEED_HIGH
 204                                 && !(desc->bEndpointAddress & USB_DIR_IN))
 205                         writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
 206                                 &ep->regs->ep_rsp);
 207         } else if (tmp == USB_ENDPOINT_XFER_BULK) {
 208                 /* catch some particularly blatant driver bugs */
 209                 if ((dev->gadget.speed == USB_SPEED_HIGH
 210                                         && max != 512)
 211                                 || (dev->gadget.speed == USB_SPEED_FULL
 212                                         && max > 64)) {
 213                         spin_unlock_irqrestore (&dev->lock, flags);
 214                         return -ERANGE;
 215                 }
 216         }
 217         ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
 218         tmp <<= ENDPOINT_TYPE;
 219         tmp |= desc->bEndpointAddress;
 220         tmp |= (4 << ENDPOINT_BYTE_COUNT);      /* default full fifo lines */
 221         tmp |= 1 << ENDPOINT_ENABLE;
 222         wmb ();
 223
 224         /* for OUT transfers, block the rx fifo until a read is posted */
 225         ep->is_in = (tmp & USB_DIR_IN) != 0;
 226         if (!ep->is_in)
 227                 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 228         else if (dev->pdev->device != 0x2280) {
 229                 /* Added for 2282, Don't use nak packets on an in endpoint,
 230                  * this was ignored on 2280
 231                  */
 232                 writel ((1 << CLEAR_NAK_OUT_PACKETS)
 233                         | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 234         }
 235
 236         writel (tmp, &ep->regs->ep_cfg);
 237
 238         /* enable irqs */
 239         if (!ep->dma) {                         /* pio, per-packet */
 240                 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
 241                 writel (tmp, &dev->regs->pciirqenb0);
 242
 243                 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
 244                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 245                 if (dev->pdev->device == 0x2280)
 246                         tmp |= readl (&ep->regs->ep_irqenb);
 247                 writel (tmp, &ep->regs->ep_irqenb);
 248         } else {                                /* dma, per-request */
 249                 tmp = (1 << (8 + ep->num));     /* completion */
 250                 tmp |= readl (&dev->regs->pciirqenb1);
 251                 writel (tmp, &dev->regs->pciirqenb1);
 252
 253                 /* for short OUT transfers, dma completions can't
 254                  * advance the queue; do it pio-style, by hand.
 255                  * NOTE erratum 0112 workaround #2
 256                  */
 257                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 258                         tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 259                         writel (tmp, &ep->regs->ep_irqenb);
 260
 261                         tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
 262                         writel (tmp, &dev->regs->pciirqenb0);
 263                 }
 264         }
 265
 266         tmp = desc->bEndpointAddress;
 267         DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 268                 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
 269                 type_string (desc->bmAttributes),
 270                 ep->dma ? "dma" : "pio", max);
 271
 272         /* pci writes may still be posted */
 273         spin_unlock_irqrestore (&dev->lock, flags);
 274         return 0;
 275 }
 276
 277 static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
 278 {
 279         u32     result;
 280
 281         do {
 282                 result = readl (ptr);
 283                 if (result == ~(u32)0)          /* "device unplugged" */
 284                         return -ENODEV;
 285                 result &= mask;
 286                 if (result == done)
 287                         return 0;
 288                 udelay (1);
 289                 usec--;
 290         } while (usec > 0);
 291         return -ETIMEDOUT;
 292 }
 293
 294 static const struct usb_ep_ops net2280_ep_ops;
 295
 296 static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
 297 {
 298         u32             tmp;
 299
 300         ep->desc = NULL;
 301         INIT_LIST_HEAD (&ep->queue);
 302
 303         ep->ep.maxpacket = ~0;
 304         ep->ep.ops = &net2280_ep_ops;
 305
 306         /* disable the dma, irqs, endpoint... */
 307         if (ep->dma) {
 308                 writel (0, &ep->dma->dmactl);
 309                 writel (  (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
 310                         | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
 311                         | (1 << DMA_ABORT)
 312                         , &ep->dma->dmastat);
 313
 314                 tmp = readl (&regs->pciirqenb0);
 315                 tmp &= ~(1 << ep->num);
 316                 writel (tmp, &regs->pciirqenb0);
 317         } else {
 318                 tmp = readl (&regs->pciirqenb1);
 319                 tmp &= ~(1 << (8 + ep->num));   /* completion */
 320                 writel (tmp, &regs->pciirqenb1);
 321         }
 322         writel (0, &ep->regs->ep_irqenb);
 323
 324         /* init to our chosen defaults, notably so that we NAK OUT
 325          * packets until the driver queues a read (+note erratum 0112)
 326          */
 327         if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
 328                 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
 329                 | (1 << SET_NAK_OUT_PACKETS)
 330                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
 331                 | (1 << CLEAR_INTERRUPT_MODE);
 332         } else {
 333                 /* added for 2282 */
 334                 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
 335                 | (1 << CLEAR_NAK_OUT_PACKETS)
 336                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
 337                 | (1 << CLEAR_INTERRUPT_MODE);
 338         }
 339
 340         if (ep->num != 0) {
 341                 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
 342                         | (1 << CLEAR_ENDPOINT_HALT);
 343         }
 344         writel (tmp, &ep->regs->ep_rsp);
 345
 346         /* scrub most status bits, and flush any fifo state */
 347         if (ep->dev->pdev->device == 0x2280)
 348                 tmp = (1 << FIFO_OVERFLOW)
 349                         | (1 << FIFO_UNDERFLOW);
 350         else
 351                 tmp = 0;
 352
 353         writel (tmp | (1 << TIMEOUT)
 354                 | (1 << USB_STALL_SENT)
 355                 | (1 << USB_IN_NAK_SENT)
 356                 | (1 << USB_IN_ACK_RCVD)
 357                 | (1 << USB_OUT_PING_NAK_SENT)
 358                 | (1 << USB_OUT_ACK_SENT)
 359                 | (1 << FIFO_FLUSH)
 360                 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
 361                 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
 362                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
 363                 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
 364                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 365                 | (1 << DATA_IN_TOKEN_INTERRUPT)
 366                 , &ep->regs->ep_stat);
 367
 368         /* fifo size is handled separately */
 369 }
 370
 371 static void nuke (struct net2280_ep *);
 372
 373 static int net2280_disable (struct usb_ep *_ep)
 374 {
 375         struct net2280_ep       *ep;
 376         unsigned long           flags;
 377
 378         ep = container_of (_ep, struct net2280_ep, ep);
 379         if (!_ep || !ep->desc || _ep->name == ep0name)
 380                 return -EINVAL;
 381
 382         spin_lock_irqsave (&ep->dev->lock, flags);
 383         nuke (ep);
 384         ep_reset (ep->dev->regs, ep);
 385
 386         VDEBUG (ep->dev, "disabled %s %s\n",
 387                         ep->dma ? "dma" : "pio", _ep->name);
 388
 389         /* synch memory views with the device */
 390         (void) readl (&ep->regs->ep_cfg);
 391
 392         if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
 393                 ep->dma = &ep->dev->dma [ep->num - 1];
 394
 395         spin_unlock_irqrestore (&ep->dev->lock, flags);
 396         return 0;
 397 }
 398
 399 /*-------------------------------------------------------------------------*/
 400
 401 static struct usb_request *
 402 net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 403 {
 404         struct net2280_ep       *ep;
 405         struct net2280_request  *req;
 406
 407         if (!_ep)
 408                 return NULL;
 409         ep = container_of (_ep, struct net2280_ep, ep);
 410
 411         req = kzalloc(sizeof(*req), gfp_flags);
 412         if (!req)
 413                 return NULL;
 414
 415         req->req.dma = DMA_ADDR_INVALID;
 416         INIT_LIST_HEAD (&req->queue);
 417
 418         /* this dma descriptor may be swapped with the previous dummy */
 419         if (ep->dma) {
 420                 struct net2280_dma      *td;
 421
 422                 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
 423                                 &req->td_dma);
 424                 if (!td) {
 425                         kfree (req);
 426                         return NULL;
 427                 }
 428                 td->dmacount = 0;       /* not VALID */
 429                 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
 430                 td->dmadesc = td->dmaaddr;
 431                 req->td = td;
 432         }
 433         return &req->req;
 434 }
 435
 436 static void
 437 net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
 438 {
 439         struct net2280_ep       *ep;
 440         struct net2280_request  *req;
 441
 442         ep = container_of (_ep, struct net2280_ep, ep);
 443         if (!_ep || !_req)
 444                 return;
 445
 446         req = container_of (_req, struct net2280_request, req);
 447         WARN_ON (!list_empty (&req->queue));
 448         if (req->td)
 449                 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
 450         kfree (req);
 451 }
 452
 453 /*-------------------------------------------------------------------------*/
 454
 455 /* load a packet into the fifo we use for usb IN transfers.
 456  * works for all endpoints.
 457  *
 458  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 459  * at a time, but this code is simpler because it knows it only writes
 460  * one packet.  ep-a..ep-d should use dma instead.
 461  */
 462 static void
 463 write_fifo (struct net2280_ep *ep, struct usb_request *req)
 464 {
 465         struct net2280_ep_regs  __iomem *regs = ep->regs;
 466         u8                      *buf;
 467         u32                     tmp;
 468         unsigned                count, total;
 469
 470         /* INVARIANT:  fifo is currently empty. (testable) */
 471
 472         if (req) {
 473                 buf = req->buf + req->actual;
 474                 prefetch (buf);
 475                 total = req->length - req->actual;
 476         } else {
 477                 total = 0;
 478                 buf = NULL;
 479         }
 480
 481         /* write just one packet at a time */
 482         count = ep->ep.maxpacket;
 483         if (count > total)      /* min() cannot be used on a bitfield */
 484                 count = total;
 485
 486         VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 487                         ep->ep.name, count,
 488                         (count != ep->ep.maxpacket) ? " (short)" : "",
 489                         req);
 490         while (count >= 4) {
 491                 /* NOTE be careful if you try to align these. fifo lines
 492                  * should normally be full (4 bytes) and successive partial
 493                  * lines are ok only in certain cases.
 494                  */
 495                 tmp = get_unaligned ((u32 *)buf);
 496                 cpu_to_le32s (&tmp);
 497                 writel (tmp, &regs->ep_data);
 498                 buf += 4;
 499                 count -= 4;
 500         }
 501
 502         /* last fifo entry is "short" unless we wrote a full packet.
 503          * also explicitly validate last word in (periodic) transfers
 504          * when maxpacket is not a multiple of 4 bytes.
 505          */
 506         if (count || total < ep->ep.maxpacket) {
 507                 tmp = count ? get_unaligned ((u32 *)buf) : count;
 508                 cpu_to_le32s (&tmp);
 509                 set_fifo_bytecount (ep, count & 0x03);
 510                 writel (tmp, &regs->ep_data);
 511         }
 512
 513         /* pci writes may still be posted */
 514 }
 515
 516 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 517  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 518  * there's no real data in the fifo.
 519  *
 520  * NOTE:  also used in cases where that erratum doesn't apply:
 521  * where the host wrote "too much" data to us.
 522  */
 523 static void out_flush (struct net2280_ep *ep)
 524 {
 525         u32     __iomem *statp;
 526         u32     tmp;
 527
 528         ASSERT_OUT_NAKING (ep);
 529
 530         statp = &ep->regs->ep_stat;
 531         writel (  (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 532                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
 533                 , statp);
 534         writel ((1 << FIFO_FLUSH), statp);
 535         mb ();
 536         tmp = readl (statp);
 537         if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 538                         /* high speed did bulk NYET; fifo isn't filling */
 539                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
 540                 unsigned        usec;
 541
 542                 usec = 50;              /* 64 byte bulk/interrupt */
 543                 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
 544                                 (1 << USB_OUT_PING_NAK_SENT), usec);
 545                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 546         }
 547 }
 548
 549 /* unload packet(s) from the fifo we use for usb OUT transfers.
 550  * returns true iff the request completed, because of short packet
 551  * or the request buffer having filled with full packets.
 552  *
 553  * for ep-a..ep-d this will read multiple packets out when they
 554  * have been accepted.
 555  */
 556 static int
 557 read_fifo (struct net2280_ep *ep, struct net2280_request *req)
 558 {
 559         struct net2280_ep_regs  __iomem *regs = ep->regs;
 560         u8                      *buf = req->req.buf + req->req.actual;
 561         unsigned                count, tmp, is_short;
 562         unsigned                cleanup = 0, prevent = 0;
 563
 564         /* erratum 0106 ... packets coming in during fifo reads might
 565          * be incompletely rejected.  not all cases have workarounds.
 566          */
 567         if (ep->dev->chiprev == 0x0100
 568                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
 569                 udelay (1);
 570                 tmp = readl (&ep->regs->ep_stat);
 571                 if ((tmp & (1 << NAK_OUT_PACKETS)))
 572                         cleanup = 1;
 573                 else if ((tmp & (1 << FIFO_FULL))) {
 574                         start_out_naking (ep);
 575                         prevent = 1;
 576                 }
 577                 /* else: hope we don't see the problem */
 578         }
 579
 580         /* never overflow the rx buffer. the fifo reads packets until
 581          * it sees a short one; we might not be ready for them all.
 582          */
 583         prefetchw (buf);
 584         count = readl (&regs->ep_avail);
 585         if (unlikely (count == 0)) {
 586                 udelay (1);
 587                 tmp = readl (&ep->regs->ep_stat);
 588                 count = readl (&regs->ep_avail);
 589                 /* handled that data already? */
 590                 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
 591                         return 0;
 592         }
 593
 594         tmp = req->req.length - req->req.actual;
 595         if (count > tmp) {
 596                 /* as with DMA, data overflow gets flushed */
 597                 if ((tmp % ep->ep.maxpacket) != 0) {
 598                         ERROR (ep->dev,
 599                                 "%s out fifo %d bytes, expected %d\n",
 600                                 ep->ep.name, count, tmp);
 601                         req->req.status = -EOVERFLOW;
 602                         cleanup = 1;
 603                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 604                          * the next read will start with the next packet
 605                          */
 606                 } /* else it's a ZLP, no worries */
 607                 count = tmp;
 608         }
 609         req->req.actual += count;
 610
 611         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 612
 613         VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 614                         ep->ep.name, count, is_short ? " (short)" : "",
 615                         cleanup ? " flush" : "", prevent ? " nak" : "",
 616                         req, req->req.actual, req->req.length);
 617
 618         while (count >= 4) {
 619                 tmp = readl (&regs->ep_data);
 620                 cpu_to_le32s (&tmp);
 621                 put_unaligned (tmp, (u32 *)buf);
 622                 buf += 4;
 623                 count -= 4;
 624         }
 625         if (count) {
 626                 tmp = readl (&regs->ep_data);
 627                 /* LE conversion is implicit here: */
 628                 do {
 629                         *buf++ = (u8) tmp;
 630                         tmp >>= 8;
 631                 } while (--count);
 632         }
 633         if (cleanup)
 634                 out_flush (ep);
 635         if (prevent) {
 636                 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 637                 (void) readl (&ep->regs->ep_rsp);
 638         }
 639
 640         return is_short || ((req->req.actual == req->req.length)
 641                                 && !req->req.zero);
 642 }
 643
 644 /* fill out dma descriptor to match a given request */
 645 static void
 646 fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
 647 {
 648         struct net2280_dma      *td = req->td;
 649         u32                     dmacount = req->req.length;
 650
 651         /* don't let DMA continue after a short OUT packet,
 652          * so overruns can't affect the next transfer.
 653          * in case of overruns on max-size packets, we can't
 654          * stop the fifo from filling but we can flush it.
 655          */
 656         if (ep->is_in)
 657                 dmacount |= (1 << DMA_DIRECTION);
 658         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
 659                         || ep->dev->pdev->device != 0x2280)
 660                 dmacount |= (1 << END_OF_CHAIN);
 661
 662         req->valid = valid;
 663         if (valid)
 664                 dmacount |= (1 << VALID_BIT);
 665         if (likely(!req->req.no_interrupt || !use_dma_chaining))
 666                 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
 667
 668         /* td->dmadesc = previously set by caller */
 669         td->dmaaddr = cpu_to_le32 (req->req.dma);
 670
 671         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 672         wmb ();
 673         td->dmacount = cpu_to_le32(dmacount);
 674 }
 675
 676 static const u32 dmactl_default =
 677                   (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
 678                 | (1 << DMA_CLEAR_COUNT_ENABLE)
 679                 /* erratum 0116 workaround part 1 (use POLLING) */
 680                 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
 681                 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
 682                 | (1 << DMA_VALID_BIT_ENABLE)
 683                 | (1 << DMA_SCATTER_GATHER_ENABLE)
 684                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 685                 | (1 << DMA_ENABLE);
 686
 687 static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
 688 {
 689         handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
 690 }
 691
 692 static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
 693 {
 694         writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
 695         spin_stop_dma (dma);
 696 }
 697
 698 static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 699 {
 700         struct net2280_dma_regs __iomem *dma = ep->dma;
 701         unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 702
 703         if (ep->dev->pdev->device != 0x2280)
 704                 tmp |= (1 << END_OF_CHAIN);
 705
 706         writel (tmp, &dma->dmacount);
 707         writel (readl (&dma->dmastat), &dma->dmastat);
 708
 709         writel (td_dma, &dma->dmadesc);
 710         writel (dmactl, &dma->dmactl);
 711
 712         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 713         (void) readl (&ep->dev->pci->pcimstctl);
 714
 715         writel ((1 << DMA_START), &dma->dmastat);
 716
 717         if (!ep->is_in)
 718                 stop_out_naking (ep);
 719 }
 720
 721 static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
 722 {
 723         u32                     tmp;
 724         struct net2280_dma_regs __iomem *dma = ep->dma;
 725
 726         /* FIXME can't use DMA for ZLPs */
 727
 728         /* on this path we "know" there's no dma active (yet) */
 729         WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
 730         writel (0, &ep->dma->dmactl);
 731
 732         /* previous OUT packet might have been short */
 733         if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
 734                                 & (1 << NAK_OUT_PACKETS)) != 0) {
 735                 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
 736                         &ep->regs->ep_stat);
 737
 738                 tmp = readl (&ep->regs->ep_avail);
 739                 if (tmp) {
 740                         writel (readl (&dma->dmastat), &dma->dmastat);
 741
 742                         /* transfer all/some fifo data */
 743                         writel (req->req.dma, &dma->dmaaddr);
 744                         tmp = min (tmp, req->req.length);
 745
 746                         /* dma irq, faking scatterlist status */
 747                         req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
 748                         writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
 749                                 | tmp, &dma->dmacount);
 750                         req->td->dmadesc = 0;
 751                         req->valid = 1;
 752
 753                         writel ((1 << DMA_ENABLE), &dma->dmactl);
 754                         writel ((1 << DMA_START), &dma->dmastat);
 755                         return;
 756                 }
 757         }
 758
 759         tmp = dmactl_default;
 760
 761         /* force packet boundaries between dma requests, but prevent the
 762          * controller from automagically writing a last "short" packet
 763          * (zero length) unless the driver explicitly said to do that.
 764          */
 765         if (ep->is_in) {
 766                 if (likely ((req->req.length % ep->ep.maxpacket) != 0
 767                                 || req->req.zero)) {
 768                         tmp |= (1 << DMA_FIFO_VALIDATE);
 769                         ep->in_fifo_validate = 1;
 770                 } else
 771                         ep->in_fifo_validate = 0;
 772         }
 773
 774         /* init req->td, pointing to the current dummy */
 775         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 776         fill_dma_desc (ep, req, 1);
 777
 778         if (!use_dma_chaining)
 779                 req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
 780
 781         start_queue (ep, tmp, req->td_dma);
 782 }
 783
 784 static inline void
 785 queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
 786 {
 787         struct net2280_dma      *end;
 788         dma_addr_t              tmp;
 789
 790         /* swap new dummy for old, link; fill and maybe activate */
 791         end = ep->dummy;
 792         ep->dummy = req->td;
 793         req->td = end;
 794
 795         tmp = ep->td_dma;
 796         ep->td_dma = req->td_dma;
 797         req->td_dma = tmp;
 798
 799         end->dmadesc = cpu_to_le32 (ep->td_dma);
 800
 801         fill_dma_desc (ep, req, valid);
 802 }
 803
 804 static void
 805 done (struct net2280_ep *ep, struct net2280_request *req, int status)
 806 {
 807         struct net2280          *dev;
 808         unsigned                stopped = ep->stopped;
 809
 810         list_del_init (&req->queue);
 811
 812         if (req->req.status == -EINPROGRESS)
 813                 req->req.status = status;
 814         else
 815                 status = req->req.status;
 816
 817         dev = ep->dev;
 818         if (req->mapped) {
 819                 pci_unmap_single (dev->pdev, req->req.dma, req->req.length,
 820                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 821                 req->req.dma = DMA_ADDR_INVALID;
 822                 req->mapped = 0;
 823         }
 824
 825         if (status && status != -ESHUTDOWN)
 826                 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
 827                         ep->ep.name, &req->req, status,
 828                         req->req.actual, req->req.length);
 829
 830         /* don't modify queue heads during completion callback */
 831         ep->stopped = 1;
 832         spin_unlock (&dev->lock);
 833         req->req.complete (&ep->ep, &req->req);
 834         spin_lock (&dev->lock);
 835         ep->stopped = stopped;
 836 }
 837
 838 /*-------------------------------------------------------------------------*/
 839
 840 static int
 841 net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 842 {
 843         struct net2280_request  *req;
 844         struct net2280_ep       *ep;
 845         struct net2280          *dev;
 846         unsigned long           flags;
 847
 848         /* we always require a cpu-view buffer, so that we can
 849          * always use pio (as fallback or whatever).
 850          */
 851         req = container_of (_req, struct net2280_request, req);
 852         if (!_req || !_req->complete || !_req->buf
 853                         || !list_empty (&req->queue))
 854                 return -EINVAL;
 855         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
 856                 return -EDOM;
 857         ep = container_of (_ep, struct net2280_ep, ep);
 858         if (!_ep || (!ep->desc && ep->num != 0))
 859                 return -EINVAL;
 860         dev = ep->dev;
 861         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 862                 return -ESHUTDOWN;
 863
 864         /* FIXME implement PIO fallback for ZLPs with DMA */
 865         if (ep->dma && _req->length == 0)
 866                 return -EOPNOTSUPP;
 867
 868         /* set up dma mapping in case the caller didn't */
 869         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 870                 _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length,
 871                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 872                 req->mapped = 1;
 873         }
 874
 875 #if 0
 876         VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
 877                         _ep->name, _req, _req->length, _req->buf);
 878 #endif
 879
 880         spin_lock_irqsave (&dev->lock, flags);
 881
 882         _req->status = -EINPROGRESS;
 883         _req->actual = 0;
 884
 885         /* kickstart this i/o queue? */
 886         if (list_empty (&ep->queue) && !ep->stopped) {
 887                 /* use DMA if the endpoint supports it, else pio */
 888                 if (ep->dma)
 889                         start_dma (ep, req);
 890                 else {
 891                         /* maybe there's no control data, just status ack */
 892                         if (ep->num == 0 && _req->length == 0) {
 893                                 allow_status (ep);
 894                                 done (ep, req, 0);
 895                                 VDEBUG (dev, "%s status ack\n", ep->ep.name);
 896                                 goto done;
 897                         }
 898
 899                         /* PIO ... stuff the fifo, or unblock it.  */
 900                         if (ep->is_in)
 901                                 write_fifo (ep, _req);
 902                         else if (list_empty (&ep->queue)) {
 903                                 u32     s;
 904
 905                                 /* OUT FIFO might have packet(s) buffered */
 906                                 s = readl (&ep->regs->ep_stat);
 907                                 if ((s & (1 << FIFO_EMPTY)) == 0) {
 908                                         /* note:  _req->short_not_ok is
 909                                          * ignored here since PIO _always_
 910                                          * stops queue advance here, and
 911                                          * _req->status doesn't change for
 912                                          * short reads (only _req->actual)
 913                                          */
 914                                         if (read_fifo (ep, req)) {
 915                                                 done (ep, req, 0);
 916                                                 if (ep->num == 0)
 917                                                         allow_status (ep);
 918                                                 /* don't queue it */
 919                                                 req = NULL;
 920                                         } else
 921                                                 s = readl (&ep->regs->ep_stat);
 922                                 }
 923
 924                                 /* don't NAK, let the fifo fill */
 925                                 if (req && (s & (1 << NAK_OUT_PACKETS)))
 926                                         writel ((1 << CLEAR_NAK_OUT_PACKETS),
 927                                                         &ep->regs->ep_rsp);
 928                         }
 929                 }
 930
 931         } else if (ep->dma) {
 932                 int     valid = 1;
 933
 934                 if (ep->is_in) {
 935                         int     expect;
 936
 937                         /* preventing magic zlps is per-engine state, not
 938                          * per-transfer; irq logic must recover hiccups.
 939                          */
 940                         expect = likely (req->req.zero
 941                                 || (req->req.length % ep->ep.maxpacket) != 0);
 942                         if (expect != ep->in_fifo_validate)
 943                                 valid = 0;
 944                 }
 945                 queue_dma (ep, req, valid);
 946
 947         } /* else the irq handler advances the queue. */
 948
 949         ep->responded = 1;
 950         if (req)
 951                 list_add_tail (&req->queue, &ep->queue);
 952 done:
 953         spin_unlock_irqrestore (&dev->lock, flags);
 954
 955         /* pci writes may still be posted */
 956         return 0;
 957 }
 958
 959 static inline void
 960 dma_done (
 961         struct net2280_ep *ep,
 962         struct net2280_request *req,
 963         u32 dmacount,
 964         int status
 965 )
 966 {
 967         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
 968         done (ep, req, status);
 969 }
 970
 971 static void restart_dma (struct net2280_ep *ep);
 972
 973 static void scan_dma_completions (struct net2280_ep *ep)
 974 {
 975         /* only look at descriptors that were "naturally" retired,
 976          * so fifo and list head state won't matter
 977          */
 978         while (!list_empty (&ep->queue)) {
 979                 struct net2280_request  *req;
 980                 u32                     tmp;
 981
 982                 req = list_entry (ep->queue.next,
 983                                 struct net2280_request, queue);
 984                 if (!req->valid)
 985                         break;
 986                 rmb ();
 987                 tmp = le32_to_cpup (&req->td->dmacount);
 988                 if ((tmp & (1 << VALID_BIT)) != 0)
 989                         break;
 990
 991                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
 992                  * cases where DMA must be aborted; this code handles
 993                  * all non-abort DMA completions.
 994                  */
 995                 if (unlikely (req->td->dmadesc == 0)) {
 996                         /* paranoia */
 997                         tmp = readl (&ep->dma->dmacount);
 998                         if (tmp & DMA_BYTE_COUNT_MASK)
 999                                 break;
1000                         /* single transfer mode */
1001                         dma_done (ep, req, tmp, 0);
1002                         break;
1003                 } else if (!ep->is_in
1004                                 && (req->req.length % ep->ep.maxpacket) != 0) {
1005                         tmp = readl (&ep->regs->ep_stat);
1006
1007                         /* AVOID TROUBLE HERE by not issuing short reads from
1008                          * your gadget driver.  That helps avoids errata 0121,
1009                          * 0122, and 0124; not all cases trigger the warning.
1010                          */
1011                         if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
1012                                 WARNING (ep->dev, "%s lost packet sync!\n",
1013                                                 ep->ep.name);
1014                                 req->req.status = -EOVERFLOW;
1015                         } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1016                                 /* fifo gets flushed later */
1017                                 ep->out_overflow = 1;
1018                                 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1019                                                 ep->ep.name, tmp,
1020                                                 req->req.length);
1021                                 req->req.status = -EOVERFLOW;
1022                         }
1023                 }
1024                 dma_done (ep, req, tmp, 0);
1025         }
1026 }
1027
1028 static void restart_dma (struct net2280_ep *ep)
1029 {
1030         struct net2280_request  *req;
1031         u32                     dmactl = dmactl_default;
1032
1033         if (ep->stopped)
1034                 return;
1035         req = list_entry (ep->queue.next, struct net2280_request, queue);
1036
1037         if (!use_dma_chaining) {
1038                 start_dma (ep, req);
1039                 return;
1040         }
1041
1042         /* the 2280 will be processing the queue unless queue hiccups after
1043          * the previous transfer:
1044          *  IN:   wanted automagic zlp, head doesn't (or vice versa)
1045          *        DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1046          *  OUT:  was "usb-short", we must restart.
1047          */
1048         if (ep->is_in && !req->valid) {
1049                 struct net2280_request  *entry, *prev = NULL;
1050                 int                     reqmode, done = 0;
1051
1052                 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1053                 ep->in_fifo_validate = likely (req->req.zero
1054                         || (req->req.length % ep->ep.maxpacket) != 0);
1055                 if (ep->in_fifo_validate)
1056                         dmactl |= (1 << DMA_FIFO_VALIDATE);
1057                 list_for_each_entry (entry, &ep->queue, queue) {
1058                         __le32          dmacount;
1059
1060                         if (entry == req)
1061                                 continue;
1062                         dmacount = entry->td->dmacount;
1063                         if (!done) {
1064                                 reqmode = likely (entry->req.zero
1065                                         || (entry->req.length
1066                                                 % ep->ep.maxpacket) != 0);
1067                                 if (reqmode == ep->in_fifo_validate) {
1068                                         entry->valid = 1;
1069                                         dmacount |= valid_bit;
1070                                         entry->td->dmacount = dmacount;
1071                                         prev = entry;
1072                                         continue;
1073                                 } else {
1074                                         /* force a hiccup */
1075                                         prev->td->dmacount |= dma_done_ie;
1076                                         done = 1;
1077                                 }
1078                         }
1079
1080                         /* walk the rest of the queue so unlinks behave */
1081                         entry->valid = 0;
1082                         dmacount &= ~valid_bit;
1083                         entry->td->dmacount = dmacount;
1084                         prev = entry;
1085                 }
1086         }
1087
1088         writel (0, &ep->dma->dmactl);
1089         start_queue (ep, dmactl, req->td_dma);
1090 }
1091
1092 static void abort_dma (struct net2280_ep *ep)
1093 {
1094         /* abort the current transfer */
1095         if (likely (!list_empty (&ep->queue))) {
1096                 /* FIXME work around errata 0121, 0122, 0124 */
1097                 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1098                 spin_stop_dma (ep->dma);
1099         } else
1100                 stop_dma (ep->dma);
1101         scan_dma_completions (ep);
1102 }
1103
1104 /* dequeue ALL requests */
1105 static void nuke (struct net2280_ep *ep)
1106 {
1107         struct net2280_request  *req;
1108
1109         /* called with spinlock held */
1110         ep->stopped = 1;
1111         if (ep->dma)
1112                 abort_dma (ep);
1113         while (!list_empty (&ep->queue)) {
1114                 req = list_entry (ep->queue.next,
1115                                 struct net2280_request,
1116                                 queue);
1117                 done (ep, req, -ESHUTDOWN);
1118         }
1119 }
1120
1121 /* dequeue JUST ONE request */
1122 static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1123 {
1124         struct net2280_ep       *ep;
1125         struct net2280_request  *req;
1126         unsigned long           flags;
1127         u32                     dmactl;
1128         int                     stopped;
1129
1130         ep = container_of (_ep, struct net2280_ep, ep);
1131         if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1132                 return -EINVAL;
1133
1134         spin_lock_irqsave (&ep->dev->lock, flags);
1135         stopped = ep->stopped;
1136
1137         /* quiesce dma while we patch the queue */
1138         dmactl = 0;
1139         ep->stopped = 1;
1140         if (ep->dma) {
1141                 dmactl = readl (&ep->dma->dmactl);
1142                 /* WARNING erratum 0127 may kick in ... */
1143                 stop_dma (ep->dma);
1144                 scan_dma_completions (ep);
1145         }
1146
1147         /* make sure it's still queued on this endpoint */
1148         list_for_each_entry (req, &ep->queue, queue) {
1149                 if (&req->req == _req)
1150                         break;
1151         }
1152         if (&req->req != _req) {
1153                 spin_unlock_irqrestore (&ep->dev->lock, flags);
1154                 return -EINVAL;
1155         }
1156
1157         /* queue head may be partially complete. */
1158         if (ep->queue.next == &req->queue) {
1159                 if (ep->dma) {
1160                         DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1161                         _req->status = -ECONNRESET;
1162                         abort_dma (ep);
1163                         if (likely (ep->queue.next == &req->queue)) {
1164                                 // NOTE: misreports single-transfer mode
1165                                 req->td->dmacount = 0;  /* invalidate */
1166                                 dma_done (ep, req,
1167                                         readl (&ep->dma->dmacount),
1168                                         -ECONNRESET);
1169                         }
1170                 } else {
1171                         DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1172                         done (ep, req, -ECONNRESET);
1173                 }
1174                 req = NULL;
1175
1176         /* patch up hardware chaining data */
1177         } else if (ep->dma && use_dma_chaining) {
1178                 if (req->queue.prev == ep->queue.next) {
1179                         writel (le32_to_cpu (req->td->dmadesc),
1180                                 &ep->dma->dmadesc);
1181                         if (req->td->dmacount & dma_done_ie)
1182                                 writel (readl (&ep->dma->dmacount)
1183                                                 | le32_to_cpu(dma_done_ie),
1184                                         &ep->dma->dmacount);
1185                 } else {
1186                         struct net2280_request  *prev;
1187
1188                         prev = list_entry (req->queue.prev,
1189                                 struct net2280_request, queue);
1190                         prev->td->dmadesc = req->td->dmadesc;
1191                         if (req->td->dmacount & dma_done_ie)
1192                                 prev->td->dmacount |= dma_done_ie;
1193                 }
1194         }
1195
1196         if (req)
1197                 done (ep, req, -ECONNRESET);
1198         ep->stopped = stopped;
1199
1200         if (ep->dma) {
1201                 /* turn off dma on inactive queues */
1202                 if (list_empty (&ep->queue))
1203                         stop_dma (ep->dma);
1204                 else if (!ep->stopped) {
1205                         /* resume current request, or start new one */
1206                         if (req)
1207                                 writel (dmactl, &ep->dma->dmactl);
1208                         else
1209                                 start_dma (ep, list_entry (ep->queue.next,
1210                                         struct net2280_request, queue));
1211                 }
1212         }
1213
1214         spin_unlock_irqrestore (&ep->dev->lock, flags);
1215         return 0;
1216 }
1217
1218 /*-------------------------------------------------------------------------*/
1219
1220 static int net2280_fifo_status (struct usb_ep *_ep);
1221
1222 static int
1223 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1224 {
1225         struct net2280_ep       *ep;
1226         unsigned long           flags;
1227         int                     retval = 0;
1228
1229         ep = container_of (_ep, struct net2280_ep, ep);
1230         if (!_ep || (!ep->desc && ep->num != 0))
1231                 return -EINVAL;
1232         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1233                 return -ESHUTDOWN;
1234         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1235                                                 == USB_ENDPOINT_XFER_ISOC)
1236                 return -EINVAL;
1237
1238         spin_lock_irqsave (&ep->dev->lock, flags);
1239         if (!list_empty (&ep->queue))
1240                 retval = -EAGAIN;
1241         else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1242                 retval = -EAGAIN;
1243         else {
1244                 VDEBUG (ep->dev, "%s %s %s\n", _ep->name,
1245                                 value ? "set" : "clear",
1246                                 wedged ? "wedge" : "halt");
1247                 /* set/clear, then synch memory views with the device */
1248                 if (value) {
1249                         if (ep->num == 0)
1250                                 ep->dev->protocol_stall = 1;
1251                         else
1252                                 set_halt (ep);
1253                         if (wedged)
1254                                 ep->wedged = 1;
1255                 } else {
1256                         clear_halt (ep);
1257                         ep->wedged = 0;
1258                 }
1259                 (void) readl (&ep->regs->ep_rsp);
1260         }
1261         spin_unlock_irqrestore (&ep->dev->lock, flags);
1262
1263         return retval;
1264 }
1265
1266 static int
1267 net2280_set_halt(struct usb_ep *_ep, int value)
1268 {
1269         return net2280_set_halt_and_wedge(_ep, value, 0);
1270 }
1271
1272 static int
1273 net2280_set_wedge(struct usb_ep *_ep)
1274 {
1275         if (!_ep || _ep->name == ep0name)
1276                 return -EINVAL;
1277         return net2280_set_halt_and_wedge(_ep, 1, 1);
1278 }
1279
1280 static int
1281 net2280_fifo_status (struct usb_ep *_ep)
1282 {
1283         struct net2280_ep       *ep;
1284         u32                     avail;
1285
1286         ep = container_of (_ep, struct net2280_ep, ep);
1287         if (!_ep || (!ep->desc && ep->num != 0))
1288                 return -ENODEV;
1289         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1290                 return -ESHUTDOWN;
1291
1292         avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1293         if (avail > ep->fifo_size)
1294                 return -EOVERFLOW;
1295         if (ep->is_in)
1296                 avail = ep->fifo_size - avail;
1297         return avail;
1298 }
1299
1300 static void
1301 net2280_fifo_flush (struct usb_ep *_ep)
1302 {
1303         struct net2280_ep       *ep;
1304
1305         ep = container_of (_ep, struct net2280_ep, ep);
1306         if (!_ep || (!ep->desc && ep->num != 0))
1307                 return;
1308         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1309                 return;
1310
1311         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1312         (void) readl (&ep->regs->ep_rsp);
1313 }
1314
1315 static const struct usb_ep_ops net2280_ep_ops = {
1316         .enable         = net2280_enable,
1317         .disable        = net2280_disable,
1318
1319         .alloc_request  = net2280_alloc_request,
1320         .free_request   = net2280_free_request,
1321
1322         .queue          = net2280_queue,
1323         .dequeue        = net2280_dequeue,
1324
1325         .set_halt       = net2280_set_halt,
1326         .set_wedge      = net2280_set_wedge,
1327         .fifo_status    = net2280_fifo_status,
1328         .fifo_flush     = net2280_fifo_flush,
1329 };
1330
1331 /*-------------------------------------------------------------------------*/
1332
1333 static int net2280_get_frame (struct usb_gadget *_gadget)
1334 {
1335         struct net2280          *dev;
1336         unsigned long           flags;
1337         u16                     retval;
1338
1339         if (!_gadget)
1340                 return -ENODEV;
1341         dev = container_of (_gadget, struct net2280, gadget);
1342         spin_lock_irqsave (&dev->lock, flags);
1343         retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1344         spin_unlock_irqrestore (&dev->lock, flags);
1345         return retval;
1346 }
1347
1348 static int net2280_wakeup (struct usb_gadget *_gadget)
1349 {
1350         struct net2280          *dev;
1351         u32                     tmp;
1352         unsigned long           flags;
1353
1354         if (!_gadget)
1355                 return 0;
1356         dev = container_of (_gadget, struct net2280, gadget);
1357
1358         spin_lock_irqsave (&dev->lock, flags);
1359         tmp = readl (&dev->usb->usbctl);
1360         if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1361                 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1362         spin_unlock_irqrestore (&dev->lock, flags);
1363
1364         /* pci writes may still be posted */
1365         return 0;
1366 }
1367
1368 static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1369 {
1370         struct net2280          *dev;
1371         u32                     tmp;
1372         unsigned long           flags;
1373
1374         if (!_gadget)
1375                 return 0;
1376         dev = container_of (_gadget, struct net2280, gadget);
1377
1378         spin_lock_irqsave (&dev->lock, flags);
1379         tmp = readl (&dev->usb->usbctl);
1380         if (value)
1381                 tmp |= (1 << SELF_POWERED_STATUS);
1382         else
1383                 tmp &= ~(1 << SELF_POWERED_STATUS);
1384         writel (tmp, &dev->usb->usbctl);
1385         spin_unlock_irqrestore (&dev->lock, flags);
1386
1387         return 0;
1388 }
1389
1390 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1391 {
1392         struct net2280  *dev;
1393         u32             tmp;
1394         unsigned long   flags;
1395
1396         if (!_gadget)
1397                 return -ENODEV;
1398         dev = container_of (_gadget, struct net2280, gadget);
1399
1400         spin_lock_irqsave (&dev->lock, flags);
1401         tmp = readl (&dev->usb->usbctl);
1402         dev->softconnect = (is_on != 0);
1403         if (is_on)
1404                 tmp |= (1 << USB_DETECT_ENABLE);
1405         else
1406                 tmp &= ~(1 << USB_DETECT_ENABLE);
1407         writel (tmp, &dev->usb->usbctl);
1408         spin_unlock_irqrestore (&dev->lock, flags);
1409
1410         return 0;
1411 }
1412
1413 static int net2280_start(struct usb_gadget_driver *driver,
1414                 int (*bind)(struct usb_gadget *));
1415 static int net2280_stop(struct usb_gadget_driver *driver);
1416
1417 static const struct usb_gadget_ops net2280_ops = {
1418         .get_frame      = net2280_get_frame,
1419         .wakeup         = net2280_wakeup,
1420         .set_selfpowered = net2280_set_selfpowered,
1421         .pullup         = net2280_pullup,
1422         .start          = net2280_start,
1423         .stop           = net2280_stop,
1424 };
1425
1426 /*-------------------------------------------------------------------------*/
1427
1428 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1429
1430 /* FIXME move these into procfs, and use seq_file.
1431  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1432  * and also doesn't help products using this with 2.4 kernels.
1433  */
1434
1435 /* "function" sysfs attribute */
1436 static ssize_t
1437 show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1438 {
1439         struct net2280  *dev = dev_get_drvdata (_dev);
1440
1441         if (!dev->driver
1442                         || !dev->driver->function
1443                         || strlen (dev->driver->function) > PAGE_SIZE)
1444                 return 0;
1445         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1446 }
1447 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1448
1449 static ssize_t net2280_show_registers(struct device *_dev,
1450                                 struct device_attribute *attr, char *buf)
1451 {
1452         struct net2280          *dev;
1453         char                    *next;
1454         unsigned                size, t;
1455         unsigned long           flags;
1456         int                     i;
1457         u32                     t1, t2;
1458         const char              *s;
1459
1460         dev = dev_get_drvdata (_dev);
1461         next = buf;
1462         size = PAGE_SIZE;
1463         spin_lock_irqsave (&dev->lock, flags);
1464
1465         if (dev->driver)
1466                 s = dev->driver->driver.name;
1467         else
1468                 s = "(none)";
1469
1470         /* Main Control Registers */
1471         t = scnprintf (next, size, "%s version " DRIVER_VERSION
1472                         ", chiprev %04x, dma %s\n\n"
1473                         "devinit %03x fifoctl %08x gadget '%s'\n"
1474                         "pci irqenb0 %02x irqenb1 %08x "
1475                         "irqstat0 %04x irqstat1 %08x\n",
1476                         driver_name, dev->chiprev,
1477                         use_dma
1478                                 ? (use_dma_chaining ? "chaining" : "enabled")
1479                                 : "disabled",
1480                         readl (&dev->regs->devinit),
1481                         readl (&dev->regs->fifoctl),
1482                         s,
1483                         readl (&dev->regs->pciirqenb0),
1484                         readl (&dev->regs->pciirqenb1),
1485                         readl (&dev->regs->irqstat0),
1486                         readl (&dev->regs->irqstat1));
1487         size -= t;
1488         next += t;
1489
1490         /* USB Control Registers */
1491         t1 = readl (&dev->usb->usbctl);
1492         t2 = readl (&dev->usb->usbstat);
1493         if (t1 & (1 << VBUS_PIN)) {
1494                 if (t2 & (1 << HIGH_SPEED))
1495                         s = "high speed";
1496                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1497                         s = "powered";
1498                 else
1499                         s = "full speed";
1500                 /* full speed bit (6) not working?? */
1501         } else
1502                         s = "not attached";
1503         t = scnprintf (next, size,
1504                         "stdrsp %08x usbctl %08x usbstat %08x "
1505                                 "addr 0x%02x (%s)\n",
1506                         readl (&dev->usb->stdrsp), t1, t2,
1507                         readl (&dev->usb->ouraddr), s);
1508         size -= t;
1509         next += t;
1510
1511         /* PCI Master Control Registers */
1512
1513         /* DMA Control Registers */
1514
1515         /* Configurable EP Control Registers */
1516         for (i = 0; i < 7; i++) {
1517                 struct net2280_ep       *ep;
1518
1519                 ep = &dev->ep [i];
1520                 if (i && !ep->desc)
1521                         continue;
1522
1523                 t1 = readl (&ep->regs->ep_cfg);
1524                 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1525                 t = scnprintf (next, size,
1526                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1527                                         "irqenb %02x\n",
1528                                 ep->ep.name, t1, t2,
1529                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1530                                         ? "NAK " : "",
1531                                 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1532                                         ? "hide " : "",
1533                                 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1534                                         ? "CRC " : "",
1535                                 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1536                                         ? "interrupt " : "",
1537                                 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1538                                         ? "status " : "",
1539                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1540                                         ? "NAKmode " : "",
1541                                 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1542                                         ? "DATA1 " : "DATA0 ",
1543                                 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1544                                         ? "HALT " : "",
1545                                 readl (&ep->regs->ep_irqenb));
1546                 size -= t;
1547                 next += t;
1548
1549                 t = scnprintf (next, size,
1550                                 "\tstat %08x avail %04x "
1551                                 "(ep%d%s-%s)%s\n",
1552                                 readl (&ep->regs->ep_stat),
1553                                 readl (&ep->regs->ep_avail),
1554                                 t1 & 0x0f, DIR_STRING (t1),
1555                                 type_string (t1 >> 8),
1556                                 ep->stopped ? "*" : "");
1557                 size -= t;
1558                 next += t;
1559
1560                 if (!ep->dma)
1561                         continue;
1562
1563                 t = scnprintf (next, size,
1564                                 "  dma\tctl %08x stat %08x count %08x\n"
1565                                 "\taddr %08x desc %08x\n",
1566                                 readl (&ep->dma->dmactl),
1567                                 readl (&ep->dma->dmastat),
1568                                 readl (&ep->dma->dmacount),
1569                                 readl (&ep->dma->dmaaddr),
1570                                 readl (&ep->dma->dmadesc));
1571                 size -= t;
1572                 next += t;
1573
1574         }
1575
1576         /* Indexed Registers */
1577                 // none yet
1578
1579         /* Statistics */
1580         t = scnprintf (next, size, "\nirqs:  ");
1581         size -= t;
1582         next += t;
1583         for (i = 0; i < 7; i++) {
1584                 struct net2280_ep       *ep;
1585
1586                 ep = &dev->ep [i];
1587                 if (i && !ep->irqs)
1588                         continue;
1589                 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1590                 size -= t;
1591                 next += t;
1592
1593         }
1594         t = scnprintf (next, size, "\n");
1595         size -= t;
1596         next += t;
1597
1598         spin_unlock_irqrestore (&dev->lock, flags);
1599
1600         return PAGE_SIZE - size;
1601 }
1602 static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL);
1603
1604 static ssize_t
1605 show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
1606 {
1607         struct net2280          *dev;
1608         char                    *next;
1609         unsigned                size;
1610         unsigned long           flags;
1611         int                     i;
1612
1613         dev = dev_get_drvdata (_dev);
1614         next = buf;
1615         size = PAGE_SIZE;
1616         spin_lock_irqsave (&dev->lock, flags);
1617
1618         for (i = 0; i < 7; i++) {
1619                 struct net2280_ep               *ep = &dev->ep [i];
1620                 struct net2280_request          *req;
1621                 int                             t;
1622
1623                 if (i != 0) {
1624                         const struct usb_endpoint_descriptor    *d;
1625
1626                         d = ep->desc;
1627                         if (!d)
1628                                 continue;
1629                         t = d->bEndpointAddress;
1630                         t = scnprintf (next, size,
1631                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1632                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1633                                 (t & USB_DIR_IN) ? "in" : "out",
1634                                 ({ char *val;
1635                                  switch (d->bmAttributes & 0x03) {
1636                                  case USB_ENDPOINT_XFER_BULK:
1637                                         val = "bulk"; break;
1638                                  case USB_ENDPOINT_XFER_INT:
1639                                         val = "intr"; break;
1640                                  default:
1641                                         val = "iso"; break;
1642                                  }; val; }),
1643                                 le16_to_cpu (d->wMaxPacketSize) & 0x1fff,
1644                                 ep->dma ? "dma" : "pio", ep->fifo_size
1645                                 );
1646                 } else /* ep0 should only have one transfer queued */
1647                         t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1648                                         ep->is_in ? "in" : "out");
1649                 if (t <= 0 || t > size)
1650                         goto done;
1651                 size -= t;
1652                 next += t;
1653
1654                 if (list_empty (&ep->queue)) {
1655                         t = scnprintf (next, size, "\t(nothing queued)\n");
1656                         if (t <= 0 || t > size)
1657                                 goto done;
1658                         size -= t;
1659                         next += t;
1660                         continue;
1661                 }
1662                 list_for_each_entry (req, &ep->queue, queue) {
1663                         if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1664                                 t = scnprintf (next, size,
1665                                         "\treq %p len %d/%d "
1666                                         "buf %p (dmacount %08x)\n",
1667                                         &req->req, req->req.actual,
1668                                         req->req.length, req->req.buf,
1669                                         readl (&ep->dma->dmacount));
1670                         else
1671                                 t = scnprintf (next, size,
1672                                         "\treq %p len %d/%d buf %p\n",
1673                                         &req->req, req->req.actual,
1674                                         req->req.length, req->req.buf);
1675                         if (t <= 0 || t > size)
1676                                 goto done;
1677                         size -= t;
1678                         next += t;
1679
1680                         if (ep->dma) {
1681                                 struct net2280_dma      *td;
1682
1683                                 td = req->td;
1684                                 t = scnprintf (next, size, "\t    td %08x "
1685                                         " count %08x buf %08x desc %08x\n",
1686                                         (u32) req->td_dma,
1687                                         le32_to_cpu (td->dmacount),
1688                                         le32_to_cpu (td->dmaaddr),
1689                                         le32_to_cpu (td->dmadesc));
1690                                 if (t <= 0 || t > size)
1691                                         goto done;
1692                                 size -= t;
1693                                 next += t;
1694                         }
1695                 }
1696         }
1697
1698 done:
1699         spin_unlock_irqrestore (&dev->lock, flags);
1700         return PAGE_SIZE - size;
1701 }
1702 static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
1703
1704
1705 #else
1706
1707 #define device_create_file(a,b) (0)
1708 #define device_remove_file(a,b) do { } while (0)
1709
1710 #endif
1711
1712 /*-------------------------------------------------------------------------*/
1713
1714 /* another driver-specific mode might be a request type doing dma
1715  * to/from another device fifo instead of to/from memory.
1716  */
1717
1718 static void set_fifo_mode (struct net2280 *dev, int mode)
1719 {
1720         /* keeping high bits preserves BAR2 */
1721         writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1722
1723         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1724         INIT_LIST_HEAD (&dev->gadget.ep_list);
1725         list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1726         list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1727         switch (mode) {
1728         case 0:
1729                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1730                 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1731                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1732                 break;
1733         case 1:
1734                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1735                 break;
1736         case 2:
1737                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1738                 dev->ep [1].fifo_size = 2048;
1739                 dev->ep [2].fifo_size = 1024;
1740                 break;
1741         }
1742         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1743         list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1744         list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1745 }
1746
1747 /* keeping it simple:
1748  * - one bus driver, initted first;
1749  * - one function driver, initted second
1750  *
1751  * most of the work to support multiple net2280 controllers would
1752  * be to associate this gadget driver (yes?) with all of them, or
1753  * perhaps to bind specific drivers to specific devices.
1754  */
1755
1756 static struct net2280   *the_controller;
1757
1758 static void usb_reset (struct net2280 *dev)
1759 {
1760         u32     tmp;
1761
1762         dev->gadget.speed = USB_SPEED_UNKNOWN;
1763         (void) readl (&dev->usb->usbctl);
1764
1765         net2280_led_init (dev);
1766
1767         /* disable automatic responses, and irqs */
1768         writel (0, &dev->usb->stdrsp);
1769         writel (0, &dev->regs->pciirqenb0);
1770         writel (0, &dev->regs->pciirqenb1);
1771
1772         /* clear old dma and irq state */
1773         for (tmp = 0; tmp < 4; tmp++) {
1774                 struct net2280_ep       *ep = &dev->ep [tmp + 1];
1775
1776                 if (ep->dma)
1777                         abort_dma (ep);
1778         }
1779         writel (~0, &dev->regs->irqstat0),
1780         writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1781
1782         /* reset, and enable pci */
1783         tmp = readl (&dev->regs->devinit)
1784                 | (1 << PCI_ENABLE)
1785                 | (1 << FIFO_SOFT_RESET)
1786                 | (1 << USB_SOFT_RESET)
1787                 | (1 << M8051_RESET);
1788         writel (tmp, &dev->regs->devinit);
1789
1790         /* standard fifo and endpoint allocations */
1791         set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1792 }
1793
1794 static void usb_reinit (struct net2280 *dev)
1795 {
1796         u32     tmp;
1797         int     init_dma;
1798
1799         /* use_dma changes are ignored till next device re-init */
1800         init_dma = use_dma;
1801
1802         /* basic endpoint init */
1803         for (tmp = 0; tmp < 7; tmp++) {
1804                 struct net2280_ep       *ep = &dev->ep [tmp];
1805
1806                 ep->ep.name = ep_name [tmp];
1807                 ep->dev = dev;
1808                 ep->num = tmp;
1809
1810                 if (tmp > 0 && tmp <= 4) {
1811                         ep->fifo_size = 1024;
1812                         if (init_dma)
1813                                 ep->dma = &dev->dma [tmp - 1];
1814                 } else
1815                         ep->fifo_size = 64;
1816                 ep->regs = &dev->epregs [tmp];
1817                 ep_reset (dev->regs, ep);
1818         }
1819         dev->ep [0].ep.maxpacket = 64;
1820         dev->ep [5].ep.maxpacket = 64;
1821         dev->ep [6].ep.maxpacket = 64;
1822
1823         dev->gadget.ep0 = &dev->ep [0].ep;
1824         dev->ep [0].stopped = 0;
1825         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1826
1827         /* we want to prevent lowlevel/insecure access from the USB host,
1828          * but erratum 0119 means this enable bit is ignored
1829          */
1830         for (tmp = 0; tmp < 5; tmp++)
1831                 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1832 }
1833
1834 static void ep0_start (struct net2280 *dev)
1835 {
1836         writel (  (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1837                 | (1 << CLEAR_NAK_OUT_PACKETS)
1838                 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1839                 , &dev->epregs [0].ep_rsp);
1840
1841         /*
1842          * hardware optionally handles a bunch of standard requests
1843          * that the API hides from drivers anyway.  have it do so.
1844          * endpoint status/features are handled in software, to
1845          * help pass tests for some dubious behavior.
1846          */
1847         writel (  (1 << SET_TEST_MODE)
1848                 | (1 << SET_ADDRESS)
1849                 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1850                 | (1 << GET_DEVICE_STATUS)
1851                 | (1 << GET_INTERFACE_STATUS)
1852                 , &dev->usb->stdrsp);
1853         writel (  (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1854                 | (1 << SELF_POWERED_USB_DEVICE)
1855                 | (1 << REMOTE_WAKEUP_SUPPORT)
1856                 | (dev->softconnect << USB_DETECT_ENABLE)
1857                 | (1 << SELF_POWERED_STATUS)
1858                 , &dev->usb->usbctl);
1859
1860         /* enable irqs so we can see ep0 and general operation  */
1861         writel (  (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1862                 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1863                 , &dev->regs->pciirqenb0);
1864         writel (  (1 << PCI_INTERRUPT_ENABLE)
1865                 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1866                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1867                 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1868                 | (1 << VBUS_INTERRUPT_ENABLE)
1869                 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1870                 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1871                 , &dev->regs->pciirqenb1);
1872
1873         /* don't leave any writes posted */
1874         (void) readl (&dev->usb->usbctl);
1875 }
1876
1877 /* when a driver is successfully registered, it will receive
1878  * control requests including set_configuration(), which enables
1879  * non-control requests.  then usb traffic follows until a
1880  * disconnect is reported.  then a host may connect again, or
1881  * the driver might get unbound.
1882  */
1883 static int net2280_start(struct usb_gadget_driver *driver,
1884                 int (*bind)(struct usb_gadget *))
1885 {
1886         struct net2280          *dev = the_controller;
1887         int                     retval;
1888         unsigned                i;
1889
1890         /* insist on high speed support from the driver, since
1891          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
1892          * "must not be used in normal operation"
1893          */
1894         if (!driver
1895                         || driver->speed != USB_SPEED_HIGH
1896                         || !bind || !driver->setup)
1897                 return -EINVAL;
1898         if (!dev)
1899                 return -ENODEV;
1900         if (dev->driver)
1901                 return -EBUSY;
1902
1903         for (i = 0; i < 7; i++)
1904                 dev->ep [i].irqs = 0;
1905
1906         /* hook up the driver ... */
1907         dev->softconnect = 1;
1908         driver->driver.bus = NULL;
1909         dev->driver = driver;
1910         dev->gadget.dev.driver = &driver->driver;
1911         retval = bind(&dev->gadget);
1912         if (retval) {
1913                 DEBUG (dev, "bind to driver %s --> %d\n",
1914                                 driver->driver.name, retval);
1915                 dev->driver = NULL;
1916                 dev->gadget.dev.driver = NULL;
1917                 return retval;
1918         }
1919
1920         retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
1921         if (retval) goto err_unbind;
1922         retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
1923         if (retval) goto err_func;
1924
1925         /* ... then enable host detection and ep0; and we're ready
1926          * for set_configuration as well as eventual disconnect.
1927          */
1928         net2280_led_active (dev, 1);
1929         ep0_start (dev);
1930
1931         DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
1932                         driver->driver.name,
1933                         readl (&dev->usb->usbctl),
1934                         readl (&dev->usb->stdrsp));
1935
1936         /* pci writes may still be posted */
1937         return 0;
1938
1939 err_func:
1940         device_remove_file (&dev->pdev->dev, &dev_attr_function);
1941 err_unbind:
1942         driver->unbind (&dev->gadget);
1943         dev->gadget.dev.driver = NULL;
1944         dev->driver = NULL;
1945         return retval;
1946 }
1947
1948 static void
1949 stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
1950 {
1951         int                     i;
1952
1953         /* don't disconnect if it's not connected */
1954         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1955                 driver = NULL;
1956
1957         /* stop hardware; prevent new request submissions;
1958          * and kill any outstanding requests.
1959          */
1960         usb_reset (dev);
1961         for (i = 0; i < 7; i++)
1962                 nuke (&dev->ep [i]);
1963
1964         /* report disconnect; the driver is already quiesced */
1965         if (driver) {
1966                 spin_unlock (&dev->lock);
1967                 driver->disconnect (&dev->gadget);
1968                 spin_lock (&dev->lock);
1969         }
1970
1971         usb_reinit (dev);
1972 }
1973
1974 static int net2280_stop(struct usb_gadget_driver *driver)
1975 {
1976         struct net2280  *dev = the_controller;
1977         unsigned long   flags;
1978
1979         if (!dev)
1980                 return -ENODEV;
1981         if (!driver || driver != dev->driver || !driver->unbind)
1982                 return -EINVAL;
1983
1984         spin_lock_irqsave (&dev->lock, flags);
1985         stop_activity (dev, driver);
1986         spin_unlock_irqrestore (&dev->lock, flags);
1987
1988         net2280_pullup (&dev->gadget, 0);
1989
1990         driver->unbind (&dev->gadget);
1991         dev->gadget.dev.driver = NULL;
1992         dev->driver = NULL;
1993
1994         net2280_led_active (dev, 0);
1995         device_remove_file (&dev->pdev->dev, &dev_attr_function);
1996         device_remove_file (&dev->pdev->dev, &dev_attr_queues);
1997
1998         DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
1999         return 0;
2000 }
2001
2002 /*-------------------------------------------------------------------------*/
2003
2004 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2005  * also works for dma-capable endpoints, in pio mode or just
2006  * to manually advance the queue after short OUT transfers.
2007  */
2008 static void handle_ep_small (struct net2280_ep *ep)
2009 {
2010         struct net2280_request  *req;
2011         u32                     t;
2012         /* 0 error, 1 mid-data, 2 done */
2013         int                     mode = 1;
2014
2015         if (!list_empty (&ep->queue))
2016                 req = list_entry (ep->queue.next,
2017                         struct net2280_request, queue);
2018         else
2019                 req = NULL;
2020
2021         /* ack all, and handle what we care about */
2022         t = readl (&ep->regs->ep_stat);
2023         ep->irqs++;
2024 #if 0
2025         VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2026                         ep->ep.name, t, req ? &req->req : 0);
2027 #endif
2028         if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2029                 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2030         else
2031                 /* Added for 2282 */
2032                 writel (t, &ep->regs->ep_stat);
2033
2034         /* for ep0, monitor token irqs to catch data stage length errors
2035          * and to synchronize on status.
2036          *
2037          * also, to defer reporting of protocol stalls ... here's where
2038          * data or status first appears, handling stalls here should never
2039          * cause trouble on the host side..
2040          *
2041          * control requests could be slightly faster without token synch for
2042          * status, but status can jam up that way.
2043          */
2044         if (unlikely (ep->num == 0)) {
2045                 if (ep->is_in) {
2046                         /* status; stop NAKing */
2047                         if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2048                                 if (ep->dev->protocol_stall) {
2049                                         ep->stopped = 1;
2050                                         set_halt (ep);
2051                                 }
2052                                 if (!req)
2053                                         allow_status (ep);
2054                                 mode = 2;
2055                         /* reply to extra IN data tokens with a zlp */
2056                         } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2057                                 if (ep->dev->protocol_stall) {
2058                                         ep->stopped = 1;
2059                                         set_halt (ep);
2060                                         mode = 2;
2061                                 } else if (ep->responded &&
2062                                                 !req && !ep->stopped)
2063                                         write_fifo (ep, NULL);
2064                         }
2065                 } else {
2066                         /* status; stop NAKing */
2067                         if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2068                                 if (ep->dev->protocol_stall) {
2069                                         ep->stopped = 1;
2070                                         set_halt (ep);
2071                                 }
2072                                 mode = 2;
2073                         /* an extra OUT token is an error */
2074                         } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2075                                         && req
2076                                         && req->req.actual == req->req.length)
2077                                         || (ep->responded && !req)) {
2078                                 ep->dev->protocol_stall = 1;
2079                                 set_halt (ep);
2080                                 ep->stopped = 1;
2081                                 if (req)
2082                                         done (ep, req, -EOVERFLOW);
2083                                 req = NULL;
2084                         }
2085                 }
2086         }
2087
2088         if (unlikely (!req))
2089                 return;
2090
2091         /* manual DMA queue advance after short OUT */
2092         if (likely (ep->dma != 0)) {
2093                 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2094                         u32     count;
2095                         int     stopped = ep->stopped;
2096
2097                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2098                          * we expect (N <= maxpacket) bytes; host wrote M.
2099                          * iff (M < N) we won't ever see a DMA interrupt.
2100                          */
2101                         ep->stopped = 1;
2102                         for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2103
2104                                 /* any preceding dma transfers must finish.
2105                                  * dma handles (M >= N), may empty the queue
2106                                  */
2107                                 scan_dma_completions (ep);
2108                                 if (unlikely (list_empty (&ep->queue)
2109                                                 || ep->out_overflow)) {
2110                                         req = NULL;
2111                                         break;
2112                                 }
2113                                 req = list_entry (ep->queue.next,
2114                                         struct net2280_request, queue);
2115
2116                                 /* here either (M < N), a "real" short rx;
2117                                  * or (M == N) and the queue didn't empty
2118                                  */
2119                                 if (likely (t & (1 << FIFO_EMPTY))) {
2120                                         count = readl (&ep->dma->dmacount);
2121                                         count &= DMA_BYTE_COUNT_MASK;
2122                                         if (readl (&ep->dma->dmadesc)
2123                                                         != req->td_dma)
2124                                                 req = NULL;
2125                                         break;
2126                                 }
2127                                 udelay(1);
2128                         }
2129
2130                         /* stop DMA, leave ep NAKing */
2131                         writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2132                         spin_stop_dma (ep->dma);
2133
2134                         if (likely (req)) {
2135                                 req->td->dmacount = 0;
2136                                 t = readl (&ep->regs->ep_avail);
2137                                 dma_done (ep, req, count,
2138                                         (ep->out_overflow || t)
2139                                                 ? -EOVERFLOW : 0);
2140                         }
2141
2142                         /* also flush to prevent erratum 0106 trouble */
2143                         if (unlikely (ep->out_overflow
2144                                         || (ep->dev->chiprev == 0x0100
2145                                                 && ep->dev->gadget.speed
2146                                                         == USB_SPEED_FULL))) {
2147                                 out_flush (ep);
2148                                 ep->out_overflow = 0;
2149                         }
2150
2151                         /* (re)start dma if needed, stop NAKing */
2152                         ep->stopped = stopped;
2153                         if (!list_empty (&ep->queue))
2154                                 restart_dma (ep);
2155                 } else
2156                         DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2157                                         ep->ep.name, t);
2158                 return;
2159
2160         /* data packet(s) received (in the fifo, OUT) */
2161         } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2162                 if (read_fifo (ep, req) && ep->num != 0)
2163                         mode = 2;
2164
2165         /* data packet(s) transmitted (IN) */
2166         } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2167                 unsigned        len;
2168
2169                 len = req->req.length - req->req.actual;
2170                 if (len > ep->ep.maxpacket)
2171                         len = ep->ep.maxpacket;
2172                 req->req.actual += len;
2173
2174                 /* if we wrote it all, we're usually done */
2175                 if (req->req.actual == req->req.length) {
2176                         if (ep->num == 0) {
2177                                 /* send zlps until the status stage */
2178                         } else if (!req->req.zero || len != ep->ep.maxpacket)
2179                                 mode = 2;
2180                 }
2181
2182         /* there was nothing to do ...  */
2183         } else if (mode == 1)
2184                 return;
2185
2186         /* done */
2187         if (mode == 2) {
2188                 /* stream endpoints often resubmit/unlink in completion */
2189                 done (ep, req, 0);
2190
2191                 /* maybe advance queue to next request */
2192                 if (ep->num == 0) {
2193                         /* NOTE:  net2280 could let gadget driver start the
2194                          * status stage later. since not all controllers let
2195                          * them control that, the api doesn't (yet) allow it.
2196                          */
2197                         if (!ep->stopped)
2198                                 allow_status (ep);
2199                         req = NULL;
2200                 } else {
2201                         if (!list_empty (&ep->queue) && !ep->stopped)
2202                                 req = list_entry (ep->queue.next,
2203                                         struct net2280_request, queue);
2204                         else
2205                                 req = NULL;
2206                         if (req && !ep->is_in)
2207                                 stop_out_naking (ep);
2208                 }
2209         }
2210
2211         /* is there a buffer for the next packet?
2212          * for best streaming performance, make sure there is one.
2213          */
2214         if (req && !ep->stopped) {
2215
2216                 /* load IN fifo with next packet (may be zlp) */
2217                 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2218                         write_fifo (ep, &req->req);
2219         }
2220 }
2221
2222 static struct net2280_ep *
2223 get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2224 {
2225         struct net2280_ep       *ep;
2226
2227         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2228                 return &dev->ep [0];
2229         list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2230                 u8      bEndpointAddress;
2231
2232                 if (!ep->desc)
2233                         continue;
2234                 bEndpointAddress = ep->desc->bEndpointAddress;
2235                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2236                         continue;
2237                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2238                         return ep;
2239         }
2240         return NULL;
2241 }
2242
2243 static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2244 {
2245         struct net2280_ep       *ep;
2246         u32                     num, scratch;
2247
2248         /* most of these don't need individual acks */
2249         stat &= ~(1 << INTA_ASSERTED);
2250         if (!stat)
2251                 return;
2252         // DEBUG (dev, "irqstat0 %04x\n", stat);
2253
2254         /* starting a control request? */
2255         if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2256                 union {
2257                         u32                     raw [2];
2258                         struct usb_ctrlrequest  r;
2259                 } u;
2260                 int                             tmp;
2261                 struct net2280_request          *req;
2262
2263                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2264                         if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2265                                 dev->gadget.speed = USB_SPEED_HIGH;
2266                         else
2267                                 dev->gadget.speed = USB_SPEED_FULL;
2268                         net2280_led_speed (dev, dev->gadget.speed);
2269                         DEBUG (dev, "%s speed\n",
2270                                 (dev->gadget.speed == USB_SPEED_HIGH)
2271                                         ? "high" : "full");
2272                 }
2273
2274                 ep = &dev->ep [0];
2275                 ep->irqs++;
2276
2277                 /* make sure any leftover request state is cleared */
2278                 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2279                 while (!list_empty (&ep->queue)) {
2280                         req = list_entry (ep->queue.next,
2281                                         struct net2280_request, queue);
2282                         done (ep, req, (req->req.actual == req->req.length)
2283                                                 ? 0 : -EPROTO);
2284                 }
2285                 ep->stopped = 0;
2286                 dev->protocol_stall = 0;
2287
2288                 if (ep->dev->pdev->device == 0x2280)
2289                         tmp = (1 << FIFO_OVERFLOW)
2290                                 | (1 << FIFO_UNDERFLOW);
2291                 else
2292                         tmp = 0;
2293
2294                 writel (tmp | (1 << TIMEOUT)
2295                         | (1 << USB_STALL_SENT)
2296                         | (1 << USB_IN_NAK_SENT)
2297                         | (1 << USB_IN_ACK_RCVD)
2298                         | (1 << USB_OUT_PING_NAK_SENT)
2299                         | (1 << USB_OUT_ACK_SENT)
2300                         | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2301                         | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2302                         | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2303                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2304                         | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2305                         | (1 << DATA_IN_TOKEN_INTERRUPT)
2306                         , &ep->regs->ep_stat);
2307                 u.raw [0] = readl (&dev->usb->setup0123);
2308                 u.raw [1] = readl (&dev->usb->setup4567);
2309
2310                 cpu_to_le32s (&u.raw [0]);
2311                 cpu_to_le32s (&u.raw [1]);
2312
2313                 tmp = 0;
2314
2315 #define w_value         le16_to_cpu(u.r.wValue)
2316 #define w_index         le16_to_cpu(u.r.wIndex)
2317 #define w_length        le16_to_cpu(u.r.wLength)
2318
2319                 /* ack the irq */
2320                 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2321                 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2322
2323                 /* watch control traffic at the token level, and force
2324                  * synchronization before letting the status stage happen.
2325                  * FIXME ignore tokens we'll NAK, until driver responds.
2326                  * that'll mean a lot less irqs for some drivers.
2327                  */
2328                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2329                 if (ep->is_in) {
2330                         scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2331                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2332                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2333                         stop_out_naking (ep);
2334                 } else
2335                         scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2336                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2337                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2338                 writel (scratch, &dev->epregs [0].ep_irqenb);
2339
2340                 /* we made the hardware handle most lowlevel requests;
2341                  * everything else goes uplevel to the gadget code.
2342                  */
2343                 ep->responded = 1;
2344                 switch (u.r.bRequest) {
2345                 case USB_REQ_GET_STATUS: {
2346                         struct net2280_ep       *e;
2347                         __le32                  status;
2348
2349                         /* hw handles device and interface status */
2350                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2351                                 goto delegate;
2352                         if ((e = get_ep_by_addr (dev, w_index)) == 0
2353                                         || w_length > 2)
2354                                 goto do_stall;
2355
2356                         if (readl (&e->regs->ep_rsp)
2357                                         & (1 << SET_ENDPOINT_HALT))
2358                                 status = cpu_to_le32 (1);
2359                         else
2360                                 status = cpu_to_le32 (0);
2361
2362                         /* don't bother with a request object! */
2363                         writel (0, &dev->epregs [0].ep_irqenb);
2364                         set_fifo_bytecount (ep, w_length);
2365                         writel ((__force u32)status, &dev->epregs [0].ep_data);
2366                         allow_status (ep);
2367                         VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2368                         goto next_endpoints;
2369                         }
2370                         break;
2371                 case USB_REQ_CLEAR_FEATURE: {
2372                         struct net2280_ep       *e;
2373
2374                         /* hw handles device features */
2375                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2376                                 goto delegate;
2377                         if (w_value != USB_ENDPOINT_HALT
2378                                         || w_length != 0)
2379                                 goto do_stall;
2380                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2381                                 goto do_stall;
2382                         if (e->wedged) {
2383                                 VDEBUG(dev, "%s wedged, halt not cleared\n",
2384                                                 ep->ep.name);
2385                         } else {
2386                                 VDEBUG(dev, "%s clear halt\n", ep->ep.name);
2387                                 clear_halt(e);
2388                         }
2389                         allow_status (ep);
2390                         goto next_endpoints;
2391                         }
2392                         break;
2393                 case USB_REQ_SET_FEATURE: {
2394                         struct net2280_ep       *e;
2395
2396                         /* hw handles device features */
2397                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2398                                 goto delegate;
2399                         if (w_value != USB_ENDPOINT_HALT
2400                                         || w_length != 0)
2401                                 goto do_stall;
2402                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2403                                 goto do_stall;
2404                         if (e->ep.name == ep0name)
2405                                 goto do_stall;
2406                         set_halt (e);
2407                         allow_status (ep);
2408                         VDEBUG (dev, "%s set halt\n", ep->ep.name);
2409                         goto next_endpoints;
2410                         }
2411                         break;
2412                 default:
2413 delegate:
2414                         VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x "
2415                                 "ep_cfg %08x\n",
2416                                 u.r.bRequestType, u.r.bRequest,
2417                                 w_value, w_index, w_length,
2418                                 readl (&ep->regs->ep_cfg));
2419                         ep->responded = 0;
2420                         spin_unlock (&dev->lock);
2421                         tmp = dev->driver->setup (&dev->gadget, &u.r);
2422                         spin_lock (&dev->lock);
2423                 }
2424
2425                 /* stall ep0 on error */
2426                 if (tmp < 0) {
2427 do_stall:
2428                         VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2429                                         u.r.bRequestType, u.r.bRequest, tmp);
2430                         dev->protocol_stall = 1;
2431                 }
2432
2433                 /* some in/out token irq should follow; maybe stall then.
2434                  * driver must queue a request (even zlp) or halt ep0
2435                  * before the host times out.
2436                  */
2437         }
2438
2439 #undef  w_value
2440 #undef  w_index
2441 #undef  w_length
2442
2443 next_endpoints:
2444         /* endpoint data irq ? */
2445         scratch = stat & 0x7f;
2446         stat &= ~0x7f;
2447         for (num = 0; scratch; num++) {
2448                 u32             t;
2449
2450                 /* do this endpoint's FIFO and queue need tending? */
2451                 t = 1 << num;
2452                 if ((scratch & t) == 0)
2453                         continue;
2454                 scratch ^= t;
2455
2456                 ep = &dev->ep [num];
2457                 handle_ep_small (ep);
2458         }
2459
2460         if (stat)
2461                 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2462 }
2463
2464 #define DMA_INTERRUPTS ( \
2465                   (1 << DMA_D_INTERRUPT) \
2466                 | (1 << DMA_C_INTERRUPT) \
2467                 | (1 << DMA_B_INTERRUPT) \
2468                 | (1 << DMA_A_INTERRUPT))
2469 #define PCI_ERROR_INTERRUPTS ( \
2470                   (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2471                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2472                 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2473
2474 static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2475 {
2476         struct net2280_ep       *ep;
2477         u32                     tmp, num, mask, scratch;
2478
2479         /* after disconnect there's nothing else to do! */
2480         tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2481         mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2482
2483         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
2484          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
2485          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
2486          * only indicates a change in the reset state).
2487          */
2488         if (stat & tmp) {
2489                 writel (tmp, &dev->regs->irqstat1);
2490                 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2491                                         && ((readl (&dev->usb->usbstat) & mask)
2492                                                         == 0))
2493                                 || ((readl (&dev->usb->usbctl)
2494                                         & (1 << VBUS_PIN)) == 0)
2495                             ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2496                         DEBUG (dev, "disconnect %s\n",
2497                                         dev->driver->driver.name);
2498                         stop_activity (dev, dev->driver);
2499                         ep0_start (dev);
2500                         return;
2501                 }
2502                 stat &= ~tmp;
2503
2504                 /* vBUS can bounce ... one of many reasons to ignore the
2505                  * notion of hotplug events on bus connect/disconnect!
2506                  */
2507                 if (!stat)
2508                         return;
2509         }
2510
2511         /* NOTE: chip stays in PCI D0 state for now, but it could
2512          * enter D1 to save more power
2513          */
2514         tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2515         if (stat & tmp) {
2516                 writel (tmp, &dev->regs->irqstat1);
2517                 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2518                         if (dev->driver->suspend)
2519                                 dev->driver->suspend (&dev->gadget);
2520                         if (!enable_suspend)
2521                                 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2522                 } else {
2523                         if (dev->driver->resume)
2524                                 dev->driver->resume (&dev->gadget);
2525                         /* at high speed, note erratum 0133 */
2526                 }
2527                 stat &= ~tmp;
2528         }
2529
2530         /* clear any other status/irqs */
2531         if (stat)
2532                 writel (stat, &dev->regs->irqstat1);
2533
2534         /* some status we can just ignore */
2535         if (dev->pdev->device == 0x2280)
2536                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2537                           | (1 << SUSPEND_REQUEST_INTERRUPT)
2538                           | (1 << RESUME_INTERRUPT)
2539                           | (1 << SOF_INTERRUPT));
2540         else
2541                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2542                           | (1 << RESUME_INTERRUPT)
2543                           | (1 << SOF_DOWN_INTERRUPT)
2544                           | (1 << SOF_INTERRUPT));
2545
2546         if (!stat)
2547                 return;
2548         // DEBUG (dev, "irqstat1 %08x\n", stat);
2549
2550         /* DMA status, for ep-{a,b,c,d} */
2551         scratch = stat & DMA_INTERRUPTS;
2552         stat &= ~DMA_INTERRUPTS;
2553         scratch >>= 9;
2554         for (num = 0; scratch; num++) {
2555                 struct net2280_dma_regs __iomem *dma;
2556
2557                 tmp = 1 << num;
2558                 if ((tmp & scratch) == 0)
2559                         continue;
2560                 scratch ^= tmp;
2561
2562                 ep = &dev->ep [num + 1];
2563                 dma = ep->dma;
2564
2565                 if (!dma)
2566                         continue;
2567
2568                 /* clear ep's dma status */
2569                 tmp = readl (&dma->dmastat);
2570                 writel (tmp, &dma->dmastat);
2571
2572                 /* chaining should stop on abort, short OUT from fifo,
2573                  * or (stat0 codepath) short OUT transfer.
2574                  */
2575                 if (!use_dma_chaining) {
2576                         if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2577                                         == 0) {
2578                                 DEBUG (ep->dev, "%s no xact done? %08x\n",
2579                                         ep->ep.name, tmp);
2580                                 continue;
2581                         }
2582                         stop_dma (ep->dma);
2583                 }
2584
2585                 /* OUT transfers terminate when the data from the
2586                  * host is in our memory.  Process whatever's done.
2587                  * On this path, we know transfer's last packet wasn't
2588                  * less than req->length. NAK_OUT_PACKETS may be set,
2589                  * or the FIFO may already be holding new packets.
2590                  *
2591                  * IN transfers can linger in the FIFO for a very
2592                  * long time ... we ignore that for now, accounting
2593                  * precisely (like PIO does) needs per-packet irqs
2594                  */
2595                 scan_dma_completions (ep);
2596
2597                 /* disable dma on inactive queues; else maybe restart */
2598                 if (list_empty (&ep->queue)) {
2599                         if (use_dma_chaining)
2600                                 stop_dma (ep->dma);
2601                 } else {
2602                         tmp = readl (&dma->dmactl);
2603                         if (!use_dma_chaining
2604                                         || (tmp & (1 << DMA_ENABLE)) == 0)
2605                                 restart_dma (ep);
2606                         else if (ep->is_in && use_dma_chaining) {
2607                                 struct net2280_request  *req;
2608                                 __le32                  dmacount;
2609
2610                                 /* the descriptor at the head of the chain
2611                                  * may still have VALID_BIT clear; that's
2612                                  * used to trigger changing DMA_FIFO_VALIDATE
2613                                  * (affects automagic zlp writes).
2614                                  */
2615                                 req = list_entry (ep->queue.next,
2616                                                 struct net2280_request, queue);
2617                                 dmacount = req->td->dmacount;
2618                                 dmacount &= cpu_to_le32 (
2619                                                 (1 << VALID_BIT)
2620                                                 | DMA_BYTE_COUNT_MASK);
2621                                 if (dmacount && (dmacount & valid_bit) == 0)
2622                                         restart_dma (ep);
2623                         }
2624                 }
2625                 ep->irqs++;
2626         }
2627
2628         /* NOTE:  there are other PCI errors we might usefully notice.
2629          * if they appear very often, here's where to try recovering.
2630          */
2631         if (stat & PCI_ERROR_INTERRUPTS) {
2632                 ERROR (dev, "pci dma error; stat %08x\n", stat);
2633                 stat &= ~PCI_ERROR_INTERRUPTS;
2634                 /* these are fatal errors, but "maybe" they won't
2635                  * happen again ...
2636                  */
2637                 stop_activity (dev, dev->driver);
2638                 ep0_start (dev);
2639                 stat = 0;
2640         }
2641
2642         if (stat)
2643                 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2644 }
2645
2646 static irqreturn_t net2280_irq (int irq, void *_dev)
2647 {
2648         struct net2280          *dev = _dev;
2649
2650         /* shared interrupt, not ours */
2651         if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2652                 return IRQ_NONE;
2653
2654         spin_lock (&dev->lock);
2655
2656         /* handle disconnect, dma, and more */
2657         handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2658
2659         /* control requests and PIO */
2660         handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2661
2662         spin_unlock (&dev->lock);
2663
2664         return IRQ_HANDLED;
2665 }
2666
2667 /*-------------------------------------------------------------------------*/
2668
2669 static void gadget_release (struct device *_dev)
2670 {
2671         struct net2280  *dev = dev_get_drvdata (_dev);
2672
2673         kfree (dev);
2674 }
2675
2676 /* tear down the binding between this driver and the pci device */
2677
2678 static void net2280_remove (struct pci_dev *pdev)
2679 {
2680         struct net2280          *dev = pci_get_drvdata (pdev);
2681
2682         usb_del_gadget_udc(&dev->gadget);
2683
2684         BUG_ON(dev->driver);
2685
2686         /* then clean up the resources we allocated during probe() */
2687         net2280_led_shutdown (dev);
2688         if (dev->requests) {
2689                 int             i;
2690                 for (i = 1; i < 5; i++) {
2691                         if (!dev->ep [i].dummy)
2692                                 continue;
2693                         pci_pool_free (dev->requests, dev->ep [i].dummy,
2694                                         dev->ep [i].td_dma);
2695                 }
2696                 pci_pool_destroy (dev->requests);
2697         }
2698         if (dev->got_irq)
2699                 free_irq (pdev->irq, dev);
2700         if (dev->regs)
2701                 iounmap (dev->regs);
2702         if (dev->region)
2703                 release_mem_region (pci_resource_start (pdev, 0),
2704                                 pci_resource_len (pdev, 0));
2705         if (dev->enabled)
2706                 pci_disable_device (pdev);
2707         device_unregister (&dev->gadget.dev);
2708         device_remove_file (&pdev->dev, &dev_attr_registers);
2709         pci_set_drvdata (pdev, NULL);
2710
2711         INFO (dev, "unbind\n");
2712
2713         the_controller = NULL;
2714 }
2715
2716 /* wrap this driver around the specified device, but
2717  * don't respond over USB until a gadget driver binds to us.
2718  */
2719
2720 static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2721 {
2722         struct net2280          *dev;
2723         unsigned long           resource, len;
2724         void                    __iomem *base = NULL;
2725         int                     retval, i;
2726
2727         /* if you want to support more than one controller in a system,
2728          * usb_gadget_driver_{register,unregister}() must change.
2729          */
2730         if (the_controller) {
2731                 dev_warn (&pdev->dev, "ignoring\n");
2732                 return -EBUSY;
2733         }
2734
2735         /* alloc, and start init */
2736         dev = kzalloc (sizeof *dev, GFP_KERNEL);
2737         if (dev == NULL){
2738                 retval = -ENOMEM;
2739                 goto done;
2740         }
2741
2742         pci_set_drvdata (pdev, dev);
2743         spin_lock_init (&dev->lock);
2744         dev->pdev = pdev;
2745         dev->gadget.ops = &net2280_ops;
2746         dev->gadget.is_dualspeed = 1;
2747
2748         /* the "gadget" abstracts/virtualizes the controller */
2749         dev_set_name(&dev->gadget.dev, "gadget");
2750         dev->gadget.dev.parent = &pdev->dev;
2751         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2752         dev->gadget.dev.release = gadget_release;
2753         dev->gadget.name = driver_name;
2754
2755         /* now all the pci goodies ... */
2756         if (pci_enable_device (pdev) < 0) {
2757                 retval = -ENODEV;
2758                 goto done;
2759         }
2760         dev->enabled = 1;
2761
2762         /* BAR 0 holds all the registers
2763          * BAR 1 is 8051 memory; unused here (note erratum 0103)
2764          * BAR 2 is fifo memory; unused here
2765          */
2766         resource = pci_resource_start (pdev, 0);
2767         len = pci_resource_len (pdev, 0);
2768         if (!request_mem_region (resource, len, driver_name)) {
2769                 DEBUG (dev, "controller already in use\n");
2770                 retval = -EBUSY;
2771                 goto done;
2772         }
2773         dev->region = 1;
2774
2775         /* FIXME provide firmware download interface to put
2776          * 8051 code into the chip, e.g. to turn on PCI PM.
2777          */
2778
2779         base = ioremap_nocache (resource, len);
2780         if (base == NULL) {
2781                 DEBUG (dev, "can't map memory\n");
2782                 retval = -EFAULT;
2783                 goto done;
2784         }
2785         dev->regs = (struct net2280_regs __iomem *) base;
2786         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2787         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2788         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2789         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2790         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2791
2792         /* put into initial config, link up all endpoints */
2793         writel (0, &dev->usb->usbctl);
2794         usb_reset (dev);
2795         usb_reinit (dev);
2796
2797         /* irq setup after old hardware is cleaned up */
2798         if (!pdev->irq) {
2799                 ERROR (dev, "No IRQ.  Check PCI setup!\n");
2800                 retval = -ENODEV;
2801                 goto done;
2802         }
2803
2804         if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
2805                         != 0) {
2806                 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
2807                 retval = -EBUSY;
2808                 goto done;
2809         }
2810         dev->got_irq = 1;
2811
2812         /* DMA setup */
2813         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
2814         dev->requests = pci_pool_create ("requests", pdev,
2815                 sizeof (struct net2280_dma),
2816                 0 /* no alignment requirements */,
2817                 0 /* or page-crossing issues */);
2818         if (!dev->requests) {
2819                 DEBUG (dev, "can't get request pool\n");
2820                 retval = -ENOMEM;
2821                 goto done;
2822         }
2823         for (i = 1; i < 5; i++) {
2824                 struct net2280_dma      *td;
2825
2826                 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2827                                 &dev->ep [i].td_dma);
2828                 if (!td) {
2829                         DEBUG (dev, "can't get dummy %d\n", i);
2830                         retval = -ENOMEM;
2831                         goto done;
2832                 }
2833                 td->dmacount = 0;       /* not VALID */
2834                 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
2835                 td->dmadesc = td->dmaaddr;
2836                 dev->ep [i].dummy = td;
2837         }
2838
2839         /* enable lower-overhead pci memory bursts during DMA */
2840         writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2841                         // 256 write retries may not be enough...
2842                         // | (1 << PCI_RETRY_ABORT_ENABLE)
2843                         | (1 << DMA_READ_MULTIPLE_ENABLE)
2844                         | (1 << DMA_READ_LINE_ENABLE)
2845                         , &dev->pci->pcimstctl);
2846         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2847         pci_set_master (pdev);
2848         pci_try_set_mwi (pdev);
2849
2850         /* ... also flushes any posted pci writes */
2851         dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2852
2853         /* done */
2854         INFO (dev, "%s\n", driver_desc);
2855         INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2856                         pdev->irq, base, dev->chiprev);
2857         INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2858                         use_dma
2859                                 ? (use_dma_chaining ? "chaining" : "enabled")
2860                                 : "disabled");
2861         the_controller = dev;
2862
2863         retval = device_register (&dev->gadget.dev);
2864         if (retval) goto done;
2865         retval = device_create_file (&pdev->dev, &dev_attr_registers);
2866         if (retval) goto done;
2867
2868         retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
2869         if (retval)
2870                 goto done;
2871         return 0;
2872
2873 done:
2874         if (dev)
2875                 net2280_remove (pdev);
2876         return retval;
2877 }
2878
2879 /* make sure the board is quiescent; otherwise it will continue
2880  * generating IRQs across the upcoming reboot.
2881  */
2882
2883 static void net2280_shutdown (struct pci_dev *pdev)
2884 {
2885         struct net2280          *dev = pci_get_drvdata (pdev);
2886
2887         /* disable IRQs */
2888         writel (0, &dev->regs->pciirqenb0);
2889         writel (0, &dev->regs->pciirqenb1);
2890
2891         /* disable the pullup so the host will think we're gone */
2892         writel (0, &dev->usb->usbctl);
2893 }
2894
2895
2896 /*-------------------------------------------------------------------------*/
2897
2898 static const struct pci_device_id pci_ids [] = { {
2899         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2900         .class_mask =   ~0,
2901         .vendor =       0x17cc,
2902         .device =       0x2280,
2903         .subvendor =    PCI_ANY_ID,
2904         .subdevice =    PCI_ANY_ID,
2905 }, {
2906         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2907         .class_mask =   ~0,
2908         .vendor =       0x17cc,
2909         .device =       0x2282,
2910         .subvendor =    PCI_ANY_ID,
2911         .subdevice =    PCI_ANY_ID,
2912
2913 }, { /* end: all zeroes */ }
2914 };
2915 MODULE_DEVICE_TABLE (pci, pci_ids);
2916
2917 /* pci driver glue; this is a "new style" PCI driver module */
2918 static struct pci_driver net2280_pci_driver = {
2919         .name =         (char *) driver_name,
2920         .id_table =     pci_ids,
2921
2922         .probe =        net2280_probe,
2923         .remove =       net2280_remove,
2924         .shutdown =     net2280_shutdown,
2925
2926         /* FIXME add power management support */
2927 };
2928
2929 MODULE_DESCRIPTION (DRIVER_DESC);
2930 MODULE_AUTHOR ("David Brownell");
2931 MODULE_LICENSE ("GPL");
2932
2933 static int __init init (void)
2934 {
2935         if (!use_dma)
2936                 use_dma_chaining = 0;
2937         return pci_register_driver (&net2280_pci_driver);
2938 }
2939 module_init (init);
2940
2941 static void __exit cleanup (void)
2942 {
2943         pci_unregister_driver (&net2280_pci_driver);
2944 }
2945 module_exit (cleanup);