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 Mass 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
  38 #undef  DEBUG           /* messages on error and most fault paths */
  39 #undef  VERBOSE         /* extra debug messages (success too) */
  40
  41 #include <linux/module.h>
  42 #include <linux/pci.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/kernel.h>
  45 #include <linux/delay.h>
  46 #include <linux/ioport.h>
  47 #include <linux/slab.h>
  48 #include <linux/errno.h>
  49 #include <linux/init.h>
  50 #include <linux/timer.h>
  51 #include <linux/list.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/moduleparam.h>
  54 #include <linux/device.h>
  55 #include <linux/usb/ch9.h>
  56 #include <linux/usb/gadget.h>
  57 #include <linux/prefetch.h>
  58
  59 #include <asm/byteorder.h>
  60 #include <asm/io.h>
  61 #include <asm/irq.h>
  62 #include <asm/unaligned.h>
  63
  64
  65 #define DRIVER_DESC             "PLX NET228x USB Peripheral Controller"
  66 #define DRIVER_VERSION          "2005 Sept 27"
  67
  68 #define EP_DONTUSE              13      /* nonzero */
  69
  70 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  71
  72
  73 static const char driver_name [] = "net2280";
  74 static const char driver_desc [] = DRIVER_DESC;
  75
  76 static const char ep0name [] = "ep0";
  77 static const char *const ep_name [] = {
  78         ep0name,
  79         "ep-a", "ep-b", "ep-c", "ep-d",
  80         "ep-e", "ep-f",
  81 };
  82
  83 /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
  84  * use_dma_chaining -- dma descriptor queueing gives even more irq reduction
  85  *
  86  * The net2280 DMA engines are not tightly integrated with their FIFOs;
  87  * not all cases are (yet) handled well in this driver or the silicon.
  88  * Some gadget drivers work better with the dma support here than others.
  89  * These two parameters let you use PIO or more aggressive DMA.
  90  */
  91 static bool use_dma = 1;
  92 static bool use_dma_chaining = 0;
  93
  94 /* "modprobe net2280 use_dma=n" etc */
  95 module_param (use_dma, bool, S_IRUGO);
  96 module_param (use_dma_chaining, bool, S_IRUGO);
  97
  98
  99 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 100  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 101  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 102  */
 103 static ushort fifo_mode = 0;
 104
 105 /* "modprobe net2280 fifo_mode=1" etc */
 106 module_param (fifo_mode, ushort, 0644);
 107
 108 /* enable_suspend -- When enabled, the driver will respond to
 109  * USB suspend requests by powering down the NET2280.  Otherwise,
 110  * USB suspend requests will be ignored.  This is acceptable for
 111  * self-powered devices
 112  */
 113 static bool enable_suspend = 0;
 114
 115 /* "modprobe net2280 enable_suspend=1" etc */
 116 module_param (enable_suspend, bool, S_IRUGO);
 117
 118 /* force full-speed operation */
 119 static bool full_speed;
 120 module_param(full_speed, bool, 0444);
 121 MODULE_PARM_DESC(full_speed, "force full-speed mode -- for testing only!");
 122
 123 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 124
 125 #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
 126 static char *type_string (u8 bmAttributes)
 127 {
 128         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 129         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 130         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 131         case USB_ENDPOINT_XFER_INT:     return "intr";
 132         }
 133         return "control";
 134 }
 135 #endif
 136
 137 #include "net2280.h"
 138
 139 #define valid_bit       cpu_to_le32 (1 << VALID_BIT)
 140 #define dma_done_ie     cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
 141
 142 /*-------------------------------------------------------------------------*/
 143
 144 static int
 145 net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 146 {
 147         struct net2280          *dev;
 148         struct net2280_ep       *ep;
 149         u32                     max, tmp;
 150         unsigned long           flags;
 151
 152         ep = container_of (_ep, struct net2280_ep, ep);
 153         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 154                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 155                 return -EINVAL;
 156         dev = ep->dev;
 157         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 158                 return -ESHUTDOWN;
 159
 160         /* erratum 0119 workaround ties up an endpoint number */
 161         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
 162                 return -EDOM;
 163
 164         /* sanity check ep-e/ep-f since their fifos are small */
 165         max = usb_endpoint_maxp (desc) & 0x1fff;
 166         if (ep->num > 4 && max > 64)
 167                 return -ERANGE;
 168
 169         spin_lock_irqsave (&dev->lock, flags);
 170         _ep->maxpacket = max & 0x7ff;
 171         ep->desc = desc;
 172
 173         /* ep_reset() has already been called */
 174         ep->stopped = 0;
 175         ep->wedged = 0;
 176         ep->out_overflow = 0;
 177
 178         /* set speed-dependent max packet; may kick in high bandwidth */
 179         set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
 180
 181         /* FIFO lines can't go to different packets.  PIO is ok, so
 182          * use it instead of troublesome (non-bulk) multi-packet DMA.
 183          */
 184         if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
 185                 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
 186                         ep->ep.name, ep->ep.maxpacket);
 187                 ep->dma = NULL;
 188         }
 189
 190         /* set type, direction, address; reset fifo counters */
 191         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
 192         tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 193         if (tmp == USB_ENDPOINT_XFER_INT) {
 194                 /* erratum 0105 workaround prevents hs NYET */
 195                 if (dev->chiprev == 0100
 196                                 && dev->gadget.speed == USB_SPEED_HIGH
 197                                 && !(desc->bEndpointAddress & USB_DIR_IN))
 198                         writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
 199                                 &ep->regs->ep_rsp);
 200         } else if (tmp == USB_ENDPOINT_XFER_BULK) {
 201                 /* catch some particularly blatant driver bugs */
 202                 if ((dev->gadget.speed == USB_SPEED_HIGH
 203                                         && max != 512)
 204                                 || (dev->gadget.speed == USB_SPEED_FULL
 205                                         && max > 64)) {
 206                         spin_unlock_irqrestore (&dev->lock, flags);
 207                         return -ERANGE;
 208                 }
 209         }
 210         ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
 211         tmp <<= ENDPOINT_TYPE;
 212         tmp |= desc->bEndpointAddress;
 213         tmp |= (4 << ENDPOINT_BYTE_COUNT);      /* default full fifo lines */
 214         tmp |= 1 << ENDPOINT_ENABLE;
 215         wmb ();
 216
 217         /* for OUT transfers, block the rx fifo until a read is posted */
 218         ep->is_in = (tmp & USB_DIR_IN) != 0;
 219         if (!ep->is_in)
 220                 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 221         else if (dev->pdev->device != 0x2280) {
 222                 /* Added for 2282, Don't use nak packets on an in endpoint,
 223                  * this was ignored on 2280
 224                  */
 225                 writel ((1 << CLEAR_NAK_OUT_PACKETS)
 226                         | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 227         }
 228
 229         writel (tmp, &ep->regs->ep_cfg);
 230
 231         /* enable irqs */
 232         if (!ep->dma) {                         /* pio, per-packet */
 233                 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
 234                 writel (tmp, &dev->regs->pciirqenb0);
 235
 236                 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
 237                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 238                 if (dev->pdev->device == 0x2280)
 239                         tmp |= readl (&ep->regs->ep_irqenb);
 240                 writel (tmp, &ep->regs->ep_irqenb);
 241         } else {                                /* dma, per-request */
 242                 tmp = (1 << (8 + ep->num));     /* completion */
 243                 tmp |= readl (&dev->regs->pciirqenb1);
 244                 writel (tmp, &dev->regs->pciirqenb1);
 245
 246                 /* for short OUT transfers, dma completions can't
 247                  * advance the queue; do it pio-style, by hand.
 248                  * NOTE erratum 0112 workaround #2
 249                  */
 250                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 251                         tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 252                         writel (tmp, &ep->regs->ep_irqenb);
 253
 254                         tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
 255                         writel (tmp, &dev->regs->pciirqenb0);
 256                 }
 257         }
 258
 259         tmp = desc->bEndpointAddress;
 260         DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 261                 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
 262                 type_string (desc->bmAttributes),
 263                 ep->dma ? "dma" : "pio", max);
 264
 265         /* pci writes may still be posted */
 266         spin_unlock_irqrestore (&dev->lock, flags);
 267         return 0;
 268 }
 269
 270 static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
 271 {
 272         u32     result;
 273
 274         do {
 275                 result = readl (ptr);
 276                 if (result == ~(u32)0)          /* "device unplugged" */
 277                         return -ENODEV;
 278                 result &= mask;
 279                 if (result == done)
 280                         return 0;
 281                 udelay (1);
 282                 usec--;
 283         } while (usec > 0);
 284         return -ETIMEDOUT;
 285 }
 286
 287 static const struct usb_ep_ops net2280_ep_ops;
 288
 289 static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
 290 {
 291         u32             tmp;
 292
 293         ep->desc = NULL;
 294         INIT_LIST_HEAD (&ep->queue);
 295
 296         ep->ep.maxpacket = ~0;
 297         ep->ep.ops = &net2280_ep_ops;
 298
 299         /* disable the dma, irqs, endpoint... */
 300         if (ep->dma) {
 301                 writel (0, &ep->dma->dmactl);
 302                 writel (  (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
 303                         | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
 304                         | (1 << DMA_ABORT)
 305                         , &ep->dma->dmastat);
 306
 307                 tmp = readl (&regs->pciirqenb0);
 308                 tmp &= ~(1 << ep->num);
 309                 writel (tmp, &regs->pciirqenb0);
 310         } else {
 311                 tmp = readl (&regs->pciirqenb1);
 312                 tmp &= ~(1 << (8 + ep->num));   /* completion */
 313                 writel (tmp, &regs->pciirqenb1);
 314         }
 315         writel (0, &ep->regs->ep_irqenb);
 316
 317         /* init to our chosen defaults, notably so that we NAK OUT
 318          * packets until the driver queues a read (+note erratum 0112)
 319          */
 320         if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
 321                 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
 322                 | (1 << SET_NAK_OUT_PACKETS)
 323                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
 324                 | (1 << CLEAR_INTERRUPT_MODE);
 325         } else {
 326                 /* added for 2282 */
 327                 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
 328                 | (1 << CLEAR_NAK_OUT_PACKETS)
 329                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
 330                 | (1 << CLEAR_INTERRUPT_MODE);
 331         }
 332
 333         if (ep->num != 0) {
 334                 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
 335                         | (1 << CLEAR_ENDPOINT_HALT);
 336         }
 337         writel (tmp, &ep->regs->ep_rsp);
 338
 339         /* scrub most status bits, and flush any fifo state */
 340         if (ep->dev->pdev->device == 0x2280)
 341                 tmp = (1 << FIFO_OVERFLOW)
 342                         | (1 << FIFO_UNDERFLOW);
 343         else
 344                 tmp = 0;
 345
 346         writel (tmp | (1 << TIMEOUT)
 347                 | (1 << USB_STALL_SENT)
 348                 | (1 << USB_IN_NAK_SENT)
 349                 | (1 << USB_IN_ACK_RCVD)
 350                 | (1 << USB_OUT_PING_NAK_SENT)
 351                 | (1 << USB_OUT_ACK_SENT)
 352                 | (1 << FIFO_FLUSH)
 353                 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
 354                 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
 355                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
 356                 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
 357                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 358                 | (1 << DATA_IN_TOKEN_INTERRUPT)
 359                 , &ep->regs->ep_stat);
 360
 361         /* fifo size is handled separately */
 362 }
 363
 364 static void nuke (struct net2280_ep *);
 365
 366 static int net2280_disable (struct usb_ep *_ep)
 367 {
 368         struct net2280_ep       *ep;
 369         unsigned long           flags;
 370
 371         ep = container_of (_ep, struct net2280_ep, ep);
 372         if (!_ep || !ep->desc || _ep->name == ep0name)
 373                 return -EINVAL;
 374
 375         spin_lock_irqsave (&ep->dev->lock, flags);
 376         nuke (ep);
 377         ep_reset (ep->dev->regs, ep);
 378
 379         VDEBUG (ep->dev, "disabled %s %s\n",
 380                         ep->dma ? "dma" : "pio", _ep->name);
 381
 382         /* synch memory views with the device */
 383         (void) readl (&ep->regs->ep_cfg);
 384
 385         if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
 386                 ep->dma = &ep->dev->dma [ep->num - 1];
 387
 388         spin_unlock_irqrestore (&ep->dev->lock, flags);
 389         return 0;
 390 }
 391
 392 /*-------------------------------------------------------------------------*/
 393
 394 static struct usb_request *
 395 net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 396 {
 397         struct net2280_ep       *ep;
 398         struct net2280_request  *req;
 399
 400         if (!_ep)
 401                 return NULL;
 402         ep = container_of (_ep, struct net2280_ep, ep);
 403
 404         req = kzalloc(sizeof(*req), gfp_flags);
 405         if (!req)
 406                 return NULL;
 407
 408         INIT_LIST_HEAD (&req->queue);
 409
 410         /* this dma descriptor may be swapped with the previous dummy */
 411         if (ep->dma) {
 412                 struct net2280_dma      *td;
 413
 414                 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
 415                                 &req->td_dma);
 416                 if (!td) {
 417                         kfree (req);
 418                         return NULL;
 419                 }
 420                 td->dmacount = 0;       /* not VALID */
 421                 td->dmadesc = td->dmaaddr;
 422                 req->td = td;
 423         }
 424         return &req->req;
 425 }
 426
 427 static void
 428 net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
 429 {
 430         struct net2280_ep       *ep;
 431         struct net2280_request  *req;
 432
 433         ep = container_of (_ep, struct net2280_ep, ep);
 434         if (!_ep || !_req)
 435                 return;
 436
 437         req = container_of (_req, struct net2280_request, req);
 438         WARN_ON (!list_empty (&req->queue));
 439         if (req->td)
 440                 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
 441         kfree (req);
 442 }
 443
 444 /*-------------------------------------------------------------------------*/
 445
 446 /* load a packet into the fifo we use for usb IN transfers.
 447  * works for all endpoints.
 448  *
 449  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 450  * at a time, but this code is simpler because it knows it only writes
 451  * one packet.  ep-a..ep-d should use dma instead.
 452  */
 453 static void
 454 write_fifo (struct net2280_ep *ep, struct usb_request *req)
 455 {
 456         struct net2280_ep_regs  __iomem *regs = ep->regs;
 457         u8                      *buf;
 458         u32                     tmp;
 459         unsigned                count, total;
 460
 461         /* INVARIANT:  fifo is currently empty. (testable) */
 462
 463         if (req) {
 464                 buf = req->buf + req->actual;
 465                 prefetch (buf);
 466                 total = req->length - req->actual;
 467         } else {
 468                 total = 0;
 469                 buf = NULL;
 470         }
 471
 472         /* write just one packet at a time */
 473         count = ep->ep.maxpacket;
 474         if (count > total)      /* min() cannot be used on a bitfield */
 475                 count = total;
 476
 477         VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 478                         ep->ep.name, count,
 479                         (count != ep->ep.maxpacket) ? " (short)" : "",
 480                         req);
 481         while (count >= 4) {
 482                 /* NOTE be careful if you try to align these. fifo lines
 483                  * should normally be full (4 bytes) and successive partial
 484                  * lines are ok only in certain cases.
 485                  */
 486                 tmp = get_unaligned ((u32 *)buf);
 487                 cpu_to_le32s (&tmp);
 488                 writel (tmp, &regs->ep_data);
 489                 buf += 4;
 490                 count -= 4;
 491         }
 492
 493         /* last fifo entry is "short" unless we wrote a full packet.
 494          * also explicitly validate last word in (periodic) transfers
 495          * when maxpacket is not a multiple of 4 bytes.
 496          */
 497         if (count || total < ep->ep.maxpacket) {
 498                 tmp = count ? get_unaligned ((u32 *)buf) : count;
 499                 cpu_to_le32s (&tmp);
 500                 set_fifo_bytecount (ep, count & 0x03);
 501                 writel (tmp, &regs->ep_data);
 502         }
 503
 504         /* pci writes may still be posted */
 505 }
 506
 507 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 508  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 509  * there's no real data in the fifo.
 510  *
 511  * NOTE:  also used in cases where that erratum doesn't apply:
 512  * where the host wrote "too much" data to us.
 513  */
 514 static void out_flush (struct net2280_ep *ep)
 515 {
 516         u32     __iomem *statp;
 517         u32     tmp;
 518
 519         ASSERT_OUT_NAKING (ep);
 520
 521         statp = &ep->regs->ep_stat;
 522         writel (  (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 523                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
 524                 , statp);
 525         writel ((1 << FIFO_FLUSH), statp);
 526         mb ();
 527         tmp = readl (statp);
 528         if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
 529                         /* high speed did bulk NYET; fifo isn't filling */
 530                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
 531                 unsigned        usec;
 532
 533                 usec = 50;              /* 64 byte bulk/interrupt */
 534                 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
 535                                 (1 << USB_OUT_PING_NAK_SENT), usec);
 536                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 537         }
 538 }
 539
 540 /* unload packet(s) from the fifo we use for usb OUT transfers.
 541  * returns true iff the request completed, because of short packet
 542  * or the request buffer having filled with full packets.
 543  *
 544  * for ep-a..ep-d this will read multiple packets out when they
 545  * have been accepted.
 546  */
 547 static int
 548 read_fifo (struct net2280_ep *ep, struct net2280_request *req)
 549 {
 550         struct net2280_ep_regs  __iomem *regs = ep->regs;
 551         u8                      *buf = req->req.buf + req->req.actual;
 552         unsigned                count, tmp, is_short;
 553         unsigned                cleanup = 0, prevent = 0;
 554
 555         /* erratum 0106 ... packets coming in during fifo reads might
 556          * be incompletely rejected.  not all cases have workarounds.
 557          */
 558         if (ep->dev->chiprev == 0x0100
 559                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
 560                 udelay (1);
 561                 tmp = readl (&ep->regs->ep_stat);
 562                 if ((tmp & (1 << NAK_OUT_PACKETS)))
 563                         cleanup = 1;
 564                 else if ((tmp & (1 << FIFO_FULL))) {
 565                         start_out_naking (ep);
 566                         prevent = 1;
 567                 }
 568                 /* else: hope we don't see the problem */
 569         }
 570
 571         /* never overflow the rx buffer. the fifo reads packets until
 572          * it sees a short one; we might not be ready for them all.
 573          */
 574         prefetchw (buf);
 575         count = readl (&regs->ep_avail);
 576         if (unlikely (count == 0)) {
 577                 udelay (1);
 578                 tmp = readl (&ep->regs->ep_stat);
 579                 count = readl (&regs->ep_avail);
 580                 /* handled that data already? */
 581                 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
 582                         return 0;
 583         }
 584
 585         tmp = req->req.length - req->req.actual;
 586         if (count > tmp) {
 587                 /* as with DMA, data overflow gets flushed */
 588                 if ((tmp % ep->ep.maxpacket) != 0) {
 589                         ERROR (ep->dev,
 590                                 "%s out fifo %d bytes, expected %d\n",
 591                                 ep->ep.name, count, tmp);
 592                         req->req.status = -EOVERFLOW;
 593                         cleanup = 1;
 594                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 595                          * the next read will start with the next packet
 596                          */
 597                 } /* else it's a ZLP, no worries */
 598                 count = tmp;
 599         }
 600         req->req.actual += count;
 601
 602         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 603
 604         VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 605                         ep->ep.name, count, is_short ? " (short)" : "",
 606                         cleanup ? " flush" : "", prevent ? " nak" : "",
 607                         req, req->req.actual, req->req.length);
 608
 609         while (count >= 4) {
 610                 tmp = readl (&regs->ep_data);
 611                 cpu_to_le32s (&tmp);
 612                 put_unaligned (tmp, (u32 *)buf);
 613                 buf += 4;
 614                 count -= 4;
 615         }
 616         if (count) {
 617                 tmp = readl (&regs->ep_data);
 618                 /* LE conversion is implicit here: */
 619                 do {
 620                         *buf++ = (u8) tmp;
 621                         tmp >>= 8;
 622                 } while (--count);
 623         }
 624         if (cleanup)
 625                 out_flush (ep);
 626         if (prevent) {
 627                 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 628                 (void) readl (&ep->regs->ep_rsp);
 629         }
 630
 631         return is_short || ((req->req.actual == req->req.length)
 632                                 && !req->req.zero);
 633 }
 634
 635 /* fill out dma descriptor to match a given request */
 636 static void
 637 fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
 638 {
 639         struct net2280_dma      *td = req->td;
 640         u32                     dmacount = req->req.length;
 641
 642         /* don't let DMA continue after a short OUT packet,
 643          * so overruns can't affect the next transfer.
 644          * in case of overruns on max-size packets, we can't
 645          * stop the fifo from filling but we can flush it.
 646          */
 647         if (ep->is_in)
 648                 dmacount |= (1 << DMA_DIRECTION);
 649         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
 650                         || ep->dev->pdev->device != 0x2280)
 651                 dmacount |= (1 << END_OF_CHAIN);
 652
 653         req->valid = valid;
 654         if (valid)
 655                 dmacount |= (1 << VALID_BIT);
 656         if (likely(!req->req.no_interrupt || !use_dma_chaining))
 657                 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
 658
 659         /* td->dmadesc = previously set by caller */
 660         td->dmaaddr = cpu_to_le32 (req->req.dma);
 661
 662         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 663         wmb ();
 664         td->dmacount = cpu_to_le32(dmacount);
 665 }
 666
 667 static const u32 dmactl_default =
 668                   (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
 669                 | (1 << DMA_CLEAR_COUNT_ENABLE)
 670                 /* erratum 0116 workaround part 1 (use POLLING) */
 671                 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
 672                 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
 673                 | (1 << DMA_VALID_BIT_ENABLE)
 674                 | (1 << DMA_SCATTER_GATHER_ENABLE)
 675                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 676                 | (1 << DMA_ENABLE);
 677
 678 static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
 679 {
 680         handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
 681 }
 682
 683 static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
 684 {
 685         writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
 686         spin_stop_dma (dma);
 687 }
 688
 689 static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 690 {
 691         struct net2280_dma_regs __iomem *dma = ep->dma;
 692         unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 693
 694         if (ep->dev->pdev->device != 0x2280)
 695                 tmp |= (1 << END_OF_CHAIN);
 696
 697         writel (tmp, &dma->dmacount);
 698         writel (readl (&dma->dmastat), &dma->dmastat);
 699
 700         writel (td_dma, &dma->dmadesc);
 701         writel (dmactl, &dma->dmactl);
 702
 703         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 704         (void) readl (&ep->dev->pci->pcimstctl);
 705
 706         writel ((1 << DMA_START), &dma->dmastat);
 707
 708         if (!ep->is_in)
 709                 stop_out_naking (ep);
 710 }
 711
 712 static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
 713 {
 714         u32                     tmp;
 715         struct net2280_dma_regs __iomem *dma = ep->dma;
 716
 717         /* FIXME can't use DMA for ZLPs */
 718
 719         /* on this path we "know" there's no dma active (yet) */
 720         WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
 721         writel (0, &ep->dma->dmactl);
 722
 723         /* previous OUT packet might have been short */
 724         if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
 725                                 & (1 << NAK_OUT_PACKETS)) != 0) {
 726                 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
 727                         &ep->regs->ep_stat);
 728
 729                 tmp = readl (&ep->regs->ep_avail);
 730                 if (tmp) {
 731                         writel (readl (&dma->dmastat), &dma->dmastat);
 732
 733                         /* transfer all/some fifo data */
 734                         writel (req->req.dma, &dma->dmaaddr);
 735                         tmp = min (tmp, req->req.length);
 736
 737                         /* dma irq, faking scatterlist status */
 738                         req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
 739                         writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
 740                                 | tmp, &dma->dmacount);
 741                         req->td->dmadesc = 0;
 742                         req->valid = 1;
 743
 744                         writel ((1 << DMA_ENABLE), &dma->dmactl);
 745                         writel ((1 << DMA_START), &dma->dmastat);
 746                         return;
 747                 }
 748         }
 749
 750         tmp = dmactl_default;
 751
 752         /* force packet boundaries between dma requests, but prevent the
 753          * controller from automagically writing a last "short" packet
 754          * (zero length) unless the driver explicitly said to do that.
 755          */
 756         if (ep->is_in) {
 757                 if (likely ((req->req.length % ep->ep.maxpacket) != 0
 758                                 || req->req.zero)) {
 759                         tmp |= (1 << DMA_FIFO_VALIDATE);
 760                         ep->in_fifo_validate = 1;
 761                 } else
 762                         ep->in_fifo_validate = 0;
 763         }
 764
 765         /* init req->td, pointing to the current dummy */
 766         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 767         fill_dma_desc (ep, req, 1);
 768
 769         if (!use_dma_chaining)
 770                 req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
 771
 772         start_queue (ep, tmp, req->td_dma);
 773 }
 774
 775 static inline void
 776 queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
 777 {
 778         struct net2280_dma      *end;
 779         dma_addr_t              tmp;
 780
 781         /* swap new dummy for old, link; fill and maybe activate */
 782         end = ep->dummy;
 783         ep->dummy = req->td;
 784         req->td = end;
 785
 786         tmp = ep->td_dma;
 787         ep->td_dma = req->td_dma;
 788         req->td_dma = tmp;
 789
 790         end->dmadesc = cpu_to_le32 (ep->td_dma);
 791
 792         fill_dma_desc (ep, req, valid);
 793 }
 794
 795 static void
 796 done (struct net2280_ep *ep, struct net2280_request *req, int status)
 797 {
 798         struct net2280          *dev;
 799         unsigned                stopped = ep->stopped;
 800
 801         list_del_init (&req->queue);
 802
 803         if (req->req.status == -EINPROGRESS)
 804                 req->req.status = status;
 805         else
 806                 status = req->req.status;
 807
 808         dev = ep->dev;
 809         if (ep->dma)
 810                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 811
 812         if (status && status != -ESHUTDOWN)
 813                 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
 814                         ep->ep.name, &req->req, status,
 815                         req->req.actual, req->req.length);
 816
 817         /* don't modify queue heads during completion callback */
 818         ep->stopped = 1;
 819         spin_unlock (&dev->lock);
 820         req->req.complete (&ep->ep, &req->req);
 821         spin_lock (&dev->lock);
 822         ep->stopped = stopped;
 823 }
 824
 825 /*-------------------------------------------------------------------------*/
 826
 827 static int
 828 net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 829 {
 830         struct net2280_request  *req;
 831         struct net2280_ep       *ep;
 832         struct net2280          *dev;
 833         unsigned long           flags;
 834
 835         /* we always require a cpu-view buffer, so that we can
 836          * always use pio (as fallback or whatever).
 837          */
 838         req = container_of (_req, struct net2280_request, req);
 839         if (!_req || !_req->complete || !_req->buf
 840                         || !list_empty (&req->queue))
 841                 return -EINVAL;
 842         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
 843                 return -EDOM;
 844         ep = container_of (_ep, struct net2280_ep, ep);
 845         if (!_ep || (!ep->desc && ep->num != 0))
 846                 return -EINVAL;
 847         dev = ep->dev;
 848         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 849                 return -ESHUTDOWN;
 850
 851         /* FIXME implement PIO fallback for ZLPs with DMA */
 852         if (ep->dma && _req->length == 0)
 853                 return -EOPNOTSUPP;
 854
 855         /* set up dma mapping in case the caller didn't */
 856         if (ep->dma) {
 857                 int ret;
 858
 859                 ret = usb_gadget_map_request(&dev->gadget, _req,
 860                                 ep->is_in);
 861                 if (ret)
 862                         return ret;
 863         }
 864
 865 #if 0
 866         VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
 867                         _ep->name, _req, _req->length, _req->buf);
 868 #endif
 869
 870         spin_lock_irqsave (&dev->lock, flags);
 871
 872         _req->status = -EINPROGRESS;
 873         _req->actual = 0;
 874
 875         /* kickstart this i/o queue? */
 876         if (list_empty (&ep->queue) && !ep->stopped) {
 877                 /* use DMA if the endpoint supports it, else pio */
 878                 if (ep->dma)
 879                         start_dma (ep, req);
 880                 else {
 881                         /* maybe there's no control data, just status ack */
 882                         if (ep->num == 0 && _req->length == 0) {
 883                                 allow_status (ep);
 884                                 done (ep, req, 0);
 885                                 VDEBUG (dev, "%s status ack\n", ep->ep.name);
 886                                 goto done;
 887                         }
 888
 889                         /* PIO ... stuff the fifo, or unblock it.  */
 890                         if (ep->is_in)
 891                                 write_fifo (ep, _req);
 892                         else if (list_empty (&ep->queue)) {
 893                                 u32     s;
 894
 895                                 /* OUT FIFO might have packet(s) buffered */
 896                                 s = readl (&ep->regs->ep_stat);
 897                                 if ((s & (1 << FIFO_EMPTY)) == 0) {
 898                                         /* note:  _req->short_not_ok is
 899                                          * ignored here since PIO _always_
 900                                          * stops queue advance here, and
 901                                          * _req->status doesn't change for
 902                                          * short reads (only _req->actual)
 903                                          */
 904                                         if (read_fifo (ep, req)) {
 905                                                 done (ep, req, 0);
 906                                                 if (ep->num == 0)
 907                                                         allow_status (ep);
 908                                                 /* don't queue it */
 909                                                 req = NULL;
 910                                         } else
 911                                                 s = readl (&ep->regs->ep_stat);
 912                                 }
 913
 914                                 /* don't NAK, let the fifo fill */
 915                                 if (req && (s & (1 << NAK_OUT_PACKETS)))
 916                                         writel ((1 << CLEAR_NAK_OUT_PACKETS),
 917                                                         &ep->regs->ep_rsp);
 918                         }
 919                 }
 920
 921         } else if (ep->dma) {
 922                 int     valid = 1;
 923
 924                 if (ep->is_in) {
 925                         int     expect;
 926
 927                         /* preventing magic zlps is per-engine state, not
 928                          * per-transfer; irq logic must recover hiccups.
 929                          */
 930                         expect = likely (req->req.zero
 931                                 || (req->req.length % ep->ep.maxpacket) != 0);
 932                         if (expect != ep->in_fifo_validate)
 933                                 valid = 0;
 934                 }
 935                 queue_dma (ep, req, valid);
 936
 937         } /* else the irq handler advances the queue. */
 938
 939         ep->responded = 1;
 940         if (req)
 941                 list_add_tail (&req->queue, &ep->queue);
 942 done:
 943         spin_unlock_irqrestore (&dev->lock, flags);
 944
 945         /* pci writes may still be posted */
 946         return 0;
 947 }
 948
 949 static inline void
 950 dma_done (
 951         struct net2280_ep *ep,
 952         struct net2280_request *req,
 953         u32 dmacount,
 954         int status
 955 )
 956 {
 957         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
 958         done (ep, req, status);
 959 }
 960
 961 static void restart_dma (struct net2280_ep *ep);
 962
 963 static void scan_dma_completions (struct net2280_ep *ep)
 964 {
 965         /* only look at descriptors that were "naturally" retired,
 966          * so fifo and list head state won't matter
 967          */
 968         while (!list_empty (&ep->queue)) {
 969                 struct net2280_request  *req;
 970                 u32                     tmp;
 971
 972                 req = list_entry (ep->queue.next,
 973                                 struct net2280_request, queue);
 974                 if (!req->valid)
 975                         break;
 976                 rmb ();
 977                 tmp = le32_to_cpup (&req->td->dmacount);
 978                 if ((tmp & (1 << VALID_BIT)) != 0)
 979                         break;
 980
 981                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
 982                  * cases where DMA must be aborted; this code handles
 983                  * all non-abort DMA completions.
 984                  */
 985                 if (unlikely (req->td->dmadesc == 0)) {
 986                         /* paranoia */
 987                         tmp = readl (&ep->dma->dmacount);
 988                         if (tmp & DMA_BYTE_COUNT_MASK)
 989                                 break;
 990                         /* single transfer mode */
 991                         dma_done (ep, req, tmp, 0);
 992                         break;
 993                 } else if (!ep->is_in
 994                                 && (req->req.length % ep->ep.maxpacket) != 0) {
 995                         tmp = readl (&ep->regs->ep_stat);
 996
 997                         /* AVOID TROUBLE HERE by not issuing short reads from
 998                          * your gadget driver.  That helps avoids errata 0121,
 999                          * 0122, and 0124; not all cases trigger the warning.
1000                          */
1001                         if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
1002                                 WARNING (ep->dev, "%s lost packet sync!\n",
1003                                                 ep->ep.name);
1004                                 req->req.status = -EOVERFLOW;
1005                         } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1006                                 /* fifo gets flushed later */
1007                                 ep->out_overflow = 1;
1008                                 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1009                                                 ep->ep.name, tmp,
1010                                                 req->req.length);
1011                                 req->req.status = -EOVERFLOW;
1012                         }
1013                 }
1014                 dma_done (ep, req, tmp, 0);
1015         }
1016 }
1017
1018 static void restart_dma (struct net2280_ep *ep)
1019 {
1020         struct net2280_request  *req;
1021         u32                     dmactl = dmactl_default;
1022
1023         if (ep->stopped)
1024                 return;
1025         req = list_entry (ep->queue.next, struct net2280_request, queue);
1026
1027         if (!use_dma_chaining) {
1028                 start_dma (ep, req);
1029                 return;
1030         }
1031
1032         /* the 2280 will be processing the queue unless queue hiccups after
1033          * the previous transfer:
1034          *  IN:   wanted automagic zlp, head doesn't (or vice versa)
1035          *        DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1036          *  OUT:  was "usb-short", we must restart.
1037          */
1038         if (ep->is_in && !req->valid) {
1039                 struct net2280_request  *entry, *prev = NULL;
1040                 int                     reqmode, done = 0;
1041
1042                 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1043                 ep->in_fifo_validate = likely (req->req.zero
1044                         || (req->req.length % ep->ep.maxpacket) != 0);
1045                 if (ep->in_fifo_validate)
1046                         dmactl |= (1 << DMA_FIFO_VALIDATE);
1047                 list_for_each_entry (entry, &ep->queue, queue) {
1048                         __le32          dmacount;
1049
1050                         if (entry == req)
1051                                 continue;
1052                         dmacount = entry->td->dmacount;
1053                         if (!done) {
1054                                 reqmode = likely (entry->req.zero
1055                                         || (entry->req.length
1056                                                 % ep->ep.maxpacket) != 0);
1057                                 if (reqmode == ep->in_fifo_validate) {
1058                                         entry->valid = 1;
1059                                         dmacount |= valid_bit;
1060                                         entry->td->dmacount = dmacount;
1061                                         prev = entry;
1062                                         continue;
1063                                 } else {
1064                                         /* force a hiccup */
1065                                         prev->td->dmacount |= dma_done_ie;
1066                                         done = 1;
1067                                 }
1068                         }
1069
1070                         /* walk the rest of the queue so unlinks behave */
1071                         entry->valid = 0;
1072                         dmacount &= ~valid_bit;
1073                         entry->td->dmacount = dmacount;
1074                         prev = entry;
1075                 }
1076         }
1077
1078         writel (0, &ep->dma->dmactl);
1079         start_queue (ep, dmactl, req->td_dma);
1080 }
1081
1082 static void abort_dma (struct net2280_ep *ep)
1083 {
1084         /* abort the current transfer */
1085         if (likely (!list_empty (&ep->queue))) {
1086                 /* FIXME work around errata 0121, 0122, 0124 */
1087                 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1088                 spin_stop_dma (ep->dma);
1089         } else
1090                 stop_dma (ep->dma);
1091         scan_dma_completions (ep);
1092 }
1093
1094 /* dequeue ALL requests */
1095 static void nuke (struct net2280_ep *ep)
1096 {
1097         struct net2280_request  *req;
1098
1099         /* called with spinlock held */
1100         ep->stopped = 1;
1101         if (ep->dma)
1102                 abort_dma (ep);
1103         while (!list_empty (&ep->queue)) {
1104                 req = list_entry (ep->queue.next,
1105                                 struct net2280_request,
1106                                 queue);
1107                 done (ep, req, -ESHUTDOWN);
1108         }
1109 }
1110
1111 /* dequeue JUST ONE request */
1112 static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1113 {
1114         struct net2280_ep       *ep;
1115         struct net2280_request  *req;
1116         unsigned long           flags;
1117         u32                     dmactl;
1118         int                     stopped;
1119
1120         ep = container_of (_ep, struct net2280_ep, ep);
1121         if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1122                 return -EINVAL;
1123
1124         spin_lock_irqsave (&ep->dev->lock, flags);
1125         stopped = ep->stopped;
1126
1127         /* quiesce dma while we patch the queue */
1128         dmactl = 0;
1129         ep->stopped = 1;
1130         if (ep->dma) {
1131                 dmactl = readl (&ep->dma->dmactl);
1132                 /* WARNING erratum 0127 may kick in ... */
1133                 stop_dma (ep->dma);
1134                 scan_dma_completions (ep);
1135         }
1136
1137         /* make sure it's still queued on this endpoint */
1138         list_for_each_entry (req, &ep->queue, queue) {
1139                 if (&req->req == _req)
1140                         break;
1141         }
1142         if (&req->req != _req) {
1143                 spin_unlock_irqrestore (&ep->dev->lock, flags);
1144                 return -EINVAL;
1145         }
1146
1147         /* queue head may be partially complete. */
1148         if (ep->queue.next == &req->queue) {
1149                 if (ep->dma) {
1150                         DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1151                         _req->status = -ECONNRESET;
1152                         abort_dma (ep);
1153                         if (likely (ep->queue.next == &req->queue)) {
1154                                 // NOTE: misreports single-transfer mode
1155                                 req->td->dmacount = 0;  /* invalidate */
1156                                 dma_done (ep, req,
1157                                         readl (&ep->dma->dmacount),
1158                                         -ECONNRESET);
1159                         }
1160                 } else {
1161                         DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1162                         done (ep, req, -ECONNRESET);
1163                 }
1164                 req = NULL;
1165
1166         /* patch up hardware chaining data */
1167         } else if (ep->dma && use_dma_chaining) {
1168                 if (req->queue.prev == ep->queue.next) {
1169                         writel (le32_to_cpu (req->td->dmadesc),
1170                                 &ep->dma->dmadesc);
1171                         if (req->td->dmacount & dma_done_ie)
1172                                 writel (readl (&ep->dma->dmacount)
1173                                                 | le32_to_cpu(dma_done_ie),
1174                                         &ep->dma->dmacount);
1175                 } else {
1176                         struct net2280_request  *prev;
1177
1178                         prev = list_entry (req->queue.prev,
1179                                 struct net2280_request, queue);
1180                         prev->td->dmadesc = req->td->dmadesc;
1181                         if (req->td->dmacount & dma_done_ie)
1182                                 prev->td->dmacount |= dma_done_ie;
1183                 }
1184         }
1185
1186         if (req)
1187                 done (ep, req, -ECONNRESET);
1188         ep->stopped = stopped;
1189
1190         if (ep->dma) {
1191                 /* turn off dma on inactive queues */
1192                 if (list_empty (&ep->queue))
1193                         stop_dma (ep->dma);
1194                 else if (!ep->stopped) {
1195                         /* resume current request, or start new one */
1196                         if (req)
1197                                 writel (dmactl, &ep->dma->dmactl);
1198                         else
1199                                 start_dma (ep, list_entry (ep->queue.next,
1200                                         struct net2280_request, queue));
1201                 }
1202         }
1203
1204         spin_unlock_irqrestore (&ep->dev->lock, flags);
1205         return 0;
1206 }
1207
1208 /*-------------------------------------------------------------------------*/
1209
1210 static int net2280_fifo_status (struct usb_ep *_ep);
1211
1212 static int
1213 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1214 {
1215         struct net2280_ep       *ep;
1216         unsigned long           flags;
1217         int                     retval = 0;
1218
1219         ep = container_of (_ep, struct net2280_ep, ep);
1220         if (!_ep || (!ep->desc && ep->num != 0))
1221                 return -EINVAL;
1222         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1223                 return -ESHUTDOWN;
1224         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1225                                                 == USB_ENDPOINT_XFER_ISOC)
1226                 return -EINVAL;
1227
1228         spin_lock_irqsave (&ep->dev->lock, flags);
1229         if (!list_empty (&ep->queue))
1230                 retval = -EAGAIN;
1231         else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1232                 retval = -EAGAIN;
1233         else {
1234                 VDEBUG (ep->dev, "%s %s %s\n", _ep->name,
1235                                 value ? "set" : "clear",
1236                                 wedged ? "wedge" : "halt");
1237                 /* set/clear, then synch memory views with the device */
1238                 if (value) {
1239                         if (ep->num == 0)
1240                                 ep->dev->protocol_stall = 1;
1241                         else
1242                                 set_halt (ep);
1243                         if (wedged)
1244                                 ep->wedged = 1;
1245                 } else {
1246                         clear_halt (ep);
1247                         ep->wedged = 0;
1248                 }
1249                 (void) readl (&ep->regs->ep_rsp);
1250         }
1251         spin_unlock_irqrestore (&ep->dev->lock, flags);
1252
1253         return retval;
1254 }
1255
1256 static int
1257 net2280_set_halt(struct usb_ep *_ep, int value)
1258 {
1259         return net2280_set_halt_and_wedge(_ep, value, 0);
1260 }
1261
1262 static int
1263 net2280_set_wedge(struct usb_ep *_ep)
1264 {
1265         if (!_ep || _ep->name == ep0name)
1266                 return -EINVAL;
1267         return net2280_set_halt_and_wedge(_ep, 1, 1);
1268 }
1269
1270 static int
1271 net2280_fifo_status (struct usb_ep *_ep)
1272 {
1273         struct net2280_ep       *ep;
1274         u32                     avail;
1275
1276         ep = container_of (_ep, struct net2280_ep, ep);
1277         if (!_ep || (!ep->desc && ep->num != 0))
1278                 return -ENODEV;
1279         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1280                 return -ESHUTDOWN;
1281
1282         avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1283         if (avail > ep->fifo_size)
1284                 return -EOVERFLOW;
1285         if (ep->is_in)
1286                 avail = ep->fifo_size - avail;
1287         return avail;
1288 }
1289
1290 static void
1291 net2280_fifo_flush (struct usb_ep *_ep)
1292 {
1293         struct net2280_ep       *ep;
1294
1295         ep = container_of (_ep, struct net2280_ep, ep);
1296         if (!_ep || (!ep->desc && ep->num != 0))
1297                 return;
1298         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1299                 return;
1300
1301         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1302         (void) readl (&ep->regs->ep_rsp);
1303 }
1304
1305 static const struct usb_ep_ops net2280_ep_ops = {
1306         .enable         = net2280_enable,
1307         .disable        = net2280_disable,
1308
1309         .alloc_request  = net2280_alloc_request,
1310         .free_request   = net2280_free_request,
1311
1312         .queue          = net2280_queue,
1313         .dequeue        = net2280_dequeue,
1314
1315         .set_halt       = net2280_set_halt,
1316         .set_wedge      = net2280_set_wedge,
1317         .fifo_status    = net2280_fifo_status,
1318         .fifo_flush     = net2280_fifo_flush,
1319 };
1320
1321 /*-------------------------------------------------------------------------*/
1322
1323 static int net2280_get_frame (struct usb_gadget *_gadget)
1324 {
1325         struct net2280          *dev;
1326         unsigned long           flags;
1327         u16                     retval;
1328
1329         if (!_gadget)
1330                 return -ENODEV;
1331         dev = container_of (_gadget, struct net2280, gadget);
1332         spin_lock_irqsave (&dev->lock, flags);
1333         retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1334         spin_unlock_irqrestore (&dev->lock, flags);
1335         return retval;
1336 }
1337
1338 static int net2280_wakeup (struct usb_gadget *_gadget)
1339 {
1340         struct net2280          *dev;
1341         u32                     tmp;
1342         unsigned long           flags;
1343
1344         if (!_gadget)
1345                 return 0;
1346         dev = container_of (_gadget, struct net2280, gadget);
1347
1348         spin_lock_irqsave (&dev->lock, flags);
1349         tmp = readl (&dev->usb->usbctl);
1350         if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1351                 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1352         spin_unlock_irqrestore (&dev->lock, flags);
1353
1354         /* pci writes may still be posted */
1355         return 0;
1356 }
1357
1358 static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1359 {
1360         struct net2280          *dev;
1361         u32                     tmp;
1362         unsigned long           flags;
1363
1364         if (!_gadget)
1365                 return 0;
1366         dev = container_of (_gadget, struct net2280, gadget);
1367
1368         spin_lock_irqsave (&dev->lock, flags);
1369         tmp = readl (&dev->usb->usbctl);
1370         if (value)
1371                 tmp |= (1 << SELF_POWERED_STATUS);
1372         else
1373                 tmp &= ~(1 << SELF_POWERED_STATUS);
1374         writel (tmp, &dev->usb->usbctl);
1375         spin_unlock_irqrestore (&dev->lock, flags);
1376
1377         return 0;
1378 }
1379
1380 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1381 {
1382         struct net2280  *dev;
1383         u32             tmp;
1384         unsigned long   flags;
1385
1386         if (!_gadget)
1387                 return -ENODEV;
1388         dev = container_of (_gadget, struct net2280, gadget);
1389
1390         spin_lock_irqsave (&dev->lock, flags);
1391         tmp = readl (&dev->usb->usbctl);
1392         dev->softconnect = (is_on != 0);
1393         if (is_on)
1394                 tmp |= (1 << USB_DETECT_ENABLE);
1395         else
1396                 tmp &= ~(1 << USB_DETECT_ENABLE);
1397         writel (tmp, &dev->usb->usbctl);
1398         spin_unlock_irqrestore (&dev->lock, flags);
1399
1400         return 0;
1401 }
1402
1403 static int net2280_start(struct usb_gadget *_gadget,
1404                 struct usb_gadget_driver *driver);
1405 static int net2280_stop(struct usb_gadget *_gadget,
1406                 struct usb_gadget_driver *driver);
1407
1408 static const struct usb_gadget_ops net2280_ops = {
1409         .get_frame      = net2280_get_frame,
1410         .wakeup         = net2280_wakeup,
1411         .set_selfpowered = net2280_set_selfpowered,
1412         .pullup         = net2280_pullup,
1413         .udc_start      = net2280_start,
1414         .udc_stop       = net2280_stop,
1415 };
1416
1417 /*-------------------------------------------------------------------------*/
1418
1419 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1420
1421 /* FIXME move these into procfs, and use seq_file.
1422  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1423  * and also doesn't help products using this with 2.4 kernels.
1424  */
1425
1426 /* "function" sysfs attribute */
1427 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1428                              char *buf)
1429 {
1430         struct net2280  *dev = dev_get_drvdata (_dev);
1431
1432         if (!dev->driver
1433                         || !dev->driver->function
1434                         || strlen (dev->driver->function) > PAGE_SIZE)
1435                 return 0;
1436         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1437 }
1438 static DEVICE_ATTR_RO(function);
1439
1440 static ssize_t registers_show(struct device *_dev,
1441                               struct device_attribute *attr, char *buf)
1442 {
1443         struct net2280          *dev;
1444         char                    *next;
1445         unsigned                size, t;
1446         unsigned long           flags;
1447         int                     i;
1448         u32                     t1, t2;
1449         const char              *s;
1450
1451         dev = dev_get_drvdata (_dev);
1452         next = buf;
1453         size = PAGE_SIZE;
1454         spin_lock_irqsave (&dev->lock, flags);
1455
1456         if (dev->driver)
1457                 s = dev->driver->driver.name;
1458         else
1459                 s = "(none)";
1460
1461         /* Main Control Registers */
1462         t = scnprintf (next, size, "%s version " DRIVER_VERSION
1463                         ", chiprev %04x, dma %s\n\n"
1464                         "devinit %03x fifoctl %08x gadget '%s'\n"
1465                         "pci irqenb0 %02x irqenb1 %08x "
1466                         "irqstat0 %04x irqstat1 %08x\n",
1467                         driver_name, dev->chiprev,
1468                         use_dma
1469                                 ? (use_dma_chaining ? "chaining" : "enabled")
1470                                 : "disabled",
1471                         readl (&dev->regs->devinit),
1472                         readl (&dev->regs->fifoctl),
1473                         s,
1474                         readl (&dev->regs->pciirqenb0),
1475                         readl (&dev->regs->pciirqenb1),
1476                         readl (&dev->regs->irqstat0),
1477                         readl (&dev->regs->irqstat1));
1478         size -= t;
1479         next += t;
1480
1481         /* USB Control Registers */
1482         t1 = readl (&dev->usb->usbctl);
1483         t2 = readl (&dev->usb->usbstat);
1484         if (t1 & (1 << VBUS_PIN)) {
1485                 if (t2 & (1 << HIGH_SPEED))
1486                         s = "high speed";
1487                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1488                         s = "powered";
1489                 else
1490                         s = "full speed";
1491                 /* full speed bit (6) not working?? */
1492         } else
1493                         s = "not attached";
1494         t = scnprintf (next, size,
1495                         "stdrsp %08x usbctl %08x usbstat %08x "
1496                                 "addr 0x%02x (%s)\n",
1497                         readl (&dev->usb->stdrsp), t1, t2,
1498                         readl (&dev->usb->ouraddr), s);
1499         size -= t;
1500         next += t;
1501
1502         /* PCI Master Control Registers */
1503
1504         /* DMA Control Registers */
1505
1506         /* Configurable EP Control Registers */
1507         for (i = 0; i < 7; i++) {
1508                 struct net2280_ep       *ep;
1509
1510                 ep = &dev->ep [i];
1511                 if (i && !ep->desc)
1512                         continue;
1513
1514                 t1 = readl (&ep->regs->ep_cfg);
1515                 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1516                 t = scnprintf (next, size,
1517                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1518                                         "irqenb %02x\n",
1519                                 ep->ep.name, t1, t2,
1520                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1521                                         ? "NAK " : "",
1522                                 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1523                                         ? "hide " : "",
1524                                 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1525                                         ? "CRC " : "",
1526                                 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1527                                         ? "interrupt " : "",
1528                                 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1529                                         ? "status " : "",
1530                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1531                                         ? "NAKmode " : "",
1532                                 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1533                                         ? "DATA1 " : "DATA0 ",
1534                                 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1535                                         ? "HALT " : "",
1536                                 readl (&ep->regs->ep_irqenb));
1537                 size -= t;
1538                 next += t;
1539
1540                 t = scnprintf (next, size,
1541                                 "\tstat %08x avail %04x "
1542                                 "(ep%d%s-%s)%s\n",
1543                                 readl (&ep->regs->ep_stat),
1544                                 readl (&ep->regs->ep_avail),
1545                                 t1 & 0x0f, DIR_STRING (t1),
1546                                 type_string (t1 >> 8),
1547                                 ep->stopped ? "*" : "");
1548                 size -= t;
1549                 next += t;
1550
1551                 if (!ep->dma)
1552                         continue;
1553
1554                 t = scnprintf (next, size,
1555                                 "  dma\tctl %08x stat %08x count %08x\n"
1556                                 "\taddr %08x desc %08x\n",
1557                                 readl (&ep->dma->dmactl),
1558                                 readl (&ep->dma->dmastat),
1559                                 readl (&ep->dma->dmacount),
1560                                 readl (&ep->dma->dmaaddr),
1561                                 readl (&ep->dma->dmadesc));
1562                 size -= t;
1563                 next += t;
1564
1565         }
1566
1567         /* Indexed Registers */
1568                 // none yet
1569
1570         /* Statistics */
1571         t = scnprintf (next, size, "\nirqs:  ");
1572         size -= t;
1573         next += t;
1574         for (i = 0; i < 7; i++) {
1575                 struct net2280_ep       *ep;
1576
1577                 ep = &dev->ep [i];
1578                 if (i && !ep->irqs)
1579                         continue;
1580                 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1581                 size -= t;
1582                 next += t;
1583
1584         }
1585         t = scnprintf (next, size, "\n");
1586         size -= t;
1587         next += t;
1588
1589         spin_unlock_irqrestore (&dev->lock, flags);
1590
1591         return PAGE_SIZE - size;
1592 }
1593 static DEVICE_ATTR_RO(registers);
1594
1595 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1596                            char *buf)
1597 {
1598         struct net2280          *dev;
1599         char                    *next;
1600         unsigned                size;
1601         unsigned long           flags;
1602         int                     i;
1603
1604         dev = dev_get_drvdata (_dev);
1605         next = buf;
1606         size = PAGE_SIZE;
1607         spin_lock_irqsave (&dev->lock, flags);
1608
1609         for (i = 0; i < 7; i++) {
1610                 struct net2280_ep               *ep = &dev->ep [i];
1611                 struct net2280_request          *req;
1612                 int                             t;
1613
1614                 if (i != 0) {
1615                         const struct usb_endpoint_descriptor    *d;
1616
1617                         d = ep->desc;
1618                         if (!d)
1619                                 continue;
1620                         t = d->bEndpointAddress;
1621                         t = scnprintf (next, size,
1622                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1623                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1624                                 (t & USB_DIR_IN) ? "in" : "out",
1625                                 ({ char *val;
1626                                  switch (d->bmAttributes & 0x03) {
1627                                  case USB_ENDPOINT_XFER_BULK:
1628                                         val = "bulk"; break;
1629                                  case USB_ENDPOINT_XFER_INT:
1630                                         val = "intr"; break;
1631                                  default:
1632                                         val = "iso"; break;
1633                                  } val; }),
1634                                 usb_endpoint_maxp (d) & 0x1fff,
1635                                 ep->dma ? "dma" : "pio", ep->fifo_size
1636                                 );
1637                 } else /* ep0 should only have one transfer queued */
1638                         t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1639                                         ep->is_in ? "in" : "out");
1640                 if (t <= 0 || t > size)
1641                         goto done;
1642                 size -= t;
1643                 next += t;
1644
1645                 if (list_empty (&ep->queue)) {
1646                         t = scnprintf (next, size, "\t(nothing queued)\n");
1647                         if (t <= 0 || t > size)
1648                                 goto done;
1649                         size -= t;
1650                         next += t;
1651                         continue;
1652                 }
1653                 list_for_each_entry (req, &ep->queue, queue) {
1654                         if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1655                                 t = scnprintf (next, size,
1656                                         "\treq %p len %d/%d "
1657                                         "buf %p (dmacount %08x)\n",
1658                                         &req->req, req->req.actual,
1659                                         req->req.length, req->req.buf,
1660                                         readl (&ep->dma->dmacount));
1661                         else
1662                                 t = scnprintf (next, size,
1663                                         "\treq %p len %d/%d buf %p\n",
1664                                         &req->req, req->req.actual,
1665                                         req->req.length, req->req.buf);
1666                         if (t <= 0 || t > size)
1667                                 goto done;
1668                         size -= t;
1669                         next += t;
1670
1671                         if (ep->dma) {
1672                                 struct net2280_dma      *td;
1673
1674                                 td = req->td;
1675                                 t = scnprintf (next, size, "\t    td %08x "
1676                                         " count %08x buf %08x desc %08x\n",
1677                                         (u32) req->td_dma,
1678                                         le32_to_cpu (td->dmacount),
1679                                         le32_to_cpu (td->dmaaddr),
1680                                         le32_to_cpu (td->dmadesc));
1681                                 if (t <= 0 || t > size)
1682                                         goto done;
1683                                 size -= t;
1684                                 next += t;
1685                         }
1686                 }
1687         }
1688
1689 done:
1690         spin_unlock_irqrestore (&dev->lock, flags);
1691         return PAGE_SIZE - size;
1692 }
1693 static DEVICE_ATTR_RO(queues);
1694
1695
1696 #else
1697
1698 #define device_create_file(a,b) (0)
1699 #define device_remove_file(a,b) do { } while (0)
1700
1701 #endif
1702
1703 /*-------------------------------------------------------------------------*/
1704
1705 /* another driver-specific mode might be a request type doing dma
1706  * to/from another device fifo instead of to/from memory.
1707  */
1708
1709 static void set_fifo_mode (struct net2280 *dev, int mode)
1710 {
1711         /* keeping high bits preserves BAR2 */
1712         writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1713
1714         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1715         INIT_LIST_HEAD (&dev->gadget.ep_list);
1716         list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1717         list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1718         switch (mode) {
1719         case 0:
1720                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1721                 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1722                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1723                 break;
1724         case 1:
1725                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1726                 break;
1727         case 2:
1728                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1729                 dev->ep [1].fifo_size = 2048;
1730                 dev->ep [2].fifo_size = 1024;
1731                 break;
1732         }
1733         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1734         list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1735         list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1736 }
1737
1738 /* keeping it simple:
1739  * - one bus driver, initted first;
1740  * - one function driver, initted second
1741  *
1742  * most of the work to support multiple net2280 controllers would
1743  * be to associate this gadget driver (yes?) with all of them, or
1744  * perhaps to bind specific drivers to specific devices.
1745  */
1746
1747 static void usb_reset (struct net2280 *dev)
1748 {
1749         u32     tmp;
1750
1751         dev->gadget.speed = USB_SPEED_UNKNOWN;
1752         (void) readl (&dev->usb->usbctl);
1753
1754         net2280_led_init (dev);
1755
1756         /* disable automatic responses, and irqs */
1757         writel (0, &dev->usb->stdrsp);
1758         writel (0, &dev->regs->pciirqenb0);
1759         writel (0, &dev->regs->pciirqenb1);
1760
1761         /* clear old dma and irq state */
1762         for (tmp = 0; tmp < 4; tmp++) {
1763                 struct net2280_ep       *ep = &dev->ep [tmp + 1];
1764
1765                 if (ep->dma)
1766                         abort_dma (ep);
1767         }
1768         writel (~0, &dev->regs->irqstat0),
1769         writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1770
1771         /* reset, and enable pci */
1772         tmp = readl (&dev->regs->devinit)
1773                 | (1 << PCI_ENABLE)
1774                 | (1 << FIFO_SOFT_RESET)
1775                 | (1 << USB_SOFT_RESET)
1776                 | (1 << M8051_RESET);
1777         writel (tmp, &dev->regs->devinit);
1778
1779         /* standard fifo and endpoint allocations */
1780         set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1781 }
1782
1783 static void usb_reinit (struct net2280 *dev)
1784 {
1785         u32     tmp;
1786         int     init_dma;
1787
1788         /* use_dma changes are ignored till next device re-init */
1789         init_dma = use_dma;
1790
1791         /* basic endpoint init */
1792         for (tmp = 0; tmp < 7; tmp++) {
1793                 struct net2280_ep       *ep = &dev->ep [tmp];
1794
1795                 ep->ep.name = ep_name [tmp];
1796                 ep->dev = dev;
1797                 ep->num = tmp;
1798
1799                 if (tmp > 0 && tmp <= 4) {
1800                         ep->fifo_size = 1024;
1801                         if (init_dma)
1802                                 ep->dma = &dev->dma [tmp - 1];
1803                 } else
1804                         ep->fifo_size = 64;
1805                 ep->regs = &dev->epregs [tmp];
1806                 ep_reset (dev->regs, ep);
1807         }
1808         dev->ep [0].ep.maxpacket = 64;
1809         dev->ep [5].ep.maxpacket = 64;
1810         dev->ep [6].ep.maxpacket = 64;
1811
1812         dev->gadget.ep0 = &dev->ep [0].ep;
1813         dev->ep [0].stopped = 0;
1814         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1815
1816         /* we want to prevent lowlevel/insecure access from the USB host,
1817          * but erratum 0119 means this enable bit is ignored
1818          */
1819         for (tmp = 0; tmp < 5; tmp++)
1820                 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1821 }
1822
1823 static void ep0_start (struct net2280 *dev)
1824 {
1825         writel (  (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1826                 | (1 << CLEAR_NAK_OUT_PACKETS)
1827                 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1828                 , &dev->epregs [0].ep_rsp);
1829
1830         /*
1831          * hardware optionally handles a bunch of standard requests
1832          * that the API hides from drivers anyway.  have it do so.
1833          * endpoint status/features are handled in software, to
1834          * help pass tests for some dubious behavior.
1835          */
1836         writel (  (1 << SET_TEST_MODE)
1837                 | (1 << SET_ADDRESS)
1838                 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1839                 | (1 << GET_DEVICE_STATUS)
1840                 | (1 << GET_INTERFACE_STATUS)
1841                 , &dev->usb->stdrsp);
1842         writel (  (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1843                 | (1 << SELF_POWERED_USB_DEVICE)
1844                 | (1 << REMOTE_WAKEUP_SUPPORT)
1845                 | (dev->softconnect << USB_DETECT_ENABLE)
1846                 | (1 << SELF_POWERED_STATUS)
1847                 , &dev->usb->usbctl);
1848
1849         /* enable irqs so we can see ep0 and general operation  */
1850         writel (  (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1851                 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1852                 , &dev->regs->pciirqenb0);
1853         writel (  (1 << PCI_INTERRUPT_ENABLE)
1854                 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1855                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1856                 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1857                 | (1 << VBUS_INTERRUPT_ENABLE)
1858                 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1859                 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1860                 , &dev->regs->pciirqenb1);
1861
1862         /* don't leave any writes posted */
1863         (void) readl (&dev->usb->usbctl);
1864 }
1865
1866 /* when a driver is successfully registered, it will receive
1867  * control requests including set_configuration(), which enables
1868  * non-control requests.  then usb traffic follows until a
1869  * disconnect is reported.  then a host may connect again, or
1870  * the driver might get unbound.
1871  */
1872 static int net2280_start(struct usb_gadget *_gadget,
1873                 struct usb_gadget_driver *driver)
1874 {
1875         struct net2280          *dev;
1876         int                     retval;
1877         unsigned                i;
1878
1879         /* insist on high speed support from the driver, since
1880          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
1881          * "must not be used in normal operation"
1882          */
1883         if (!driver || driver->max_speed < USB_SPEED_HIGH
1884                         || !driver->setup)
1885                 return -EINVAL;
1886
1887         dev = container_of (_gadget, struct net2280, gadget);
1888
1889         for (i = 0; i < 7; i++)
1890                 dev->ep [i].irqs = 0;
1891
1892         /* hook up the driver ... */
1893         dev->softconnect = 1;
1894         driver->driver.bus = NULL;
1895         dev->driver = driver;
1896
1897         retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
1898         if (retval) goto err_unbind;
1899         retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
1900         if (retval) goto err_func;
1901
1902         /* Enable force-full-speed testing mode, if desired */
1903         if (full_speed)
1904                 writel(1 << FORCE_FULL_SPEED_MODE, &dev->usb->xcvrdiag);
1905
1906         /* ... then enable host detection and ep0; and we're ready
1907          * for set_configuration as well as eventual disconnect.
1908          */
1909         net2280_led_active (dev, 1);
1910         ep0_start (dev);
1911
1912         DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
1913                         driver->driver.name,
1914                         readl (&dev->usb->usbctl),
1915                         readl (&dev->usb->stdrsp));
1916
1917         /* pci writes may still be posted */
1918         return 0;
1919
1920 err_func:
1921         device_remove_file (&dev->pdev->dev, &dev_attr_function);
1922 err_unbind:
1923         dev->driver = NULL;
1924         return retval;
1925 }
1926
1927 static void
1928 stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
1929 {
1930         int                     i;
1931
1932         /* don't disconnect if it's not connected */
1933         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1934                 driver = NULL;
1935
1936         /* stop hardware; prevent new request submissions;
1937          * and kill any outstanding requests.
1938          */
1939         usb_reset (dev);
1940         for (i = 0; i < 7; i++)
1941                 nuke (&dev->ep [i]);
1942
1943         /* report disconnect; the driver is already quiesced */
1944         if (driver) {
1945                 spin_unlock(&dev->lock);
1946                 driver->disconnect(&dev->gadget);
1947                 spin_lock(&dev->lock);
1948         }
1949
1950         usb_reinit (dev);
1951 }
1952
1953 static int net2280_stop(struct usb_gadget *_gadget,
1954                 struct usb_gadget_driver *driver)
1955 {
1956         struct net2280  *dev;
1957         unsigned long   flags;
1958
1959         dev = container_of (_gadget, struct net2280, gadget);
1960
1961         spin_lock_irqsave (&dev->lock, flags);
1962         stop_activity (dev, driver);
1963         spin_unlock_irqrestore (&dev->lock, flags);
1964
1965         dev->driver = NULL;
1966
1967         net2280_led_active (dev, 0);
1968
1969         /* Disable full-speed test mode */
1970         writel(0, &dev->usb->xcvrdiag);
1971
1972         device_remove_file (&dev->pdev->dev, &dev_attr_function);
1973         device_remove_file (&dev->pdev->dev, &dev_attr_queues);
1974
1975         DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
1976         return 0;
1977 }
1978
1979 /*-------------------------------------------------------------------------*/
1980
1981 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
1982  * also works for dma-capable endpoints, in pio mode or just
1983  * to manually advance the queue after short OUT transfers.
1984  */
1985 static void handle_ep_small (struct net2280_ep *ep)
1986 {
1987         struct net2280_request  *req;
1988         u32                     t;
1989         /* 0 error, 1 mid-data, 2 done */
1990         int                     mode = 1;
1991
1992         if (!list_empty (&ep->queue))
1993                 req = list_entry (ep->queue.next,
1994                         struct net2280_request, queue);
1995         else
1996                 req = NULL;
1997
1998         /* ack all, and handle what we care about */
1999         t = readl (&ep->regs->ep_stat);
2000         ep->irqs++;
2001 #if 0
2002         VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2003                         ep->ep.name, t, req ? &req->req : 0);
2004 #endif
2005         if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2006                 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2007         else
2008                 /* Added for 2282 */
2009                 writel (t, &ep->regs->ep_stat);
2010
2011         /* for ep0, monitor token irqs to catch data stage length errors
2012          * and to synchronize on status.
2013          *
2014          * also, to defer reporting of protocol stalls ... here's where
2015          * data or status first appears, handling stalls here should never
2016          * cause trouble on the host side..
2017          *
2018          * control requests could be slightly faster without token synch for
2019          * status, but status can jam up that way.
2020          */
2021         if (unlikely (ep->num == 0)) {
2022                 if (ep->is_in) {
2023                         /* status; stop NAKing */
2024                         if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2025                                 if (ep->dev->protocol_stall) {
2026                                         ep->stopped = 1;
2027                                         set_halt (ep);
2028                                 }
2029                                 if (!req)
2030                                         allow_status (ep);
2031                                 mode = 2;
2032                         /* reply to extra IN data tokens with a zlp */
2033                         } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2034                                 if (ep->dev->protocol_stall) {
2035                                         ep->stopped = 1;
2036                                         set_halt (ep);
2037                                         mode = 2;
2038                                 } else if (ep->responded &&
2039                                                 !req && !ep->stopped)
2040                                         write_fifo (ep, NULL);
2041                         }
2042                 } else {
2043                         /* status; stop NAKing */
2044                         if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2045                                 if (ep->dev->protocol_stall) {
2046                                         ep->stopped = 1;
2047                                         set_halt (ep);
2048                                 }
2049                                 mode = 2;
2050                         /* an extra OUT token is an error */
2051                         } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2052                                         && req
2053                                         && req->req.actual == req->req.length)
2054                                         || (ep->responded && !req)) {
2055                                 ep->dev->protocol_stall = 1;
2056                                 set_halt (ep);
2057                                 ep->stopped = 1;
2058                                 if (req)
2059                                         done (ep, req, -EOVERFLOW);
2060                                 req = NULL;
2061                         }
2062                 }
2063         }
2064
2065         if (unlikely (!req))
2066                 return;
2067
2068         /* manual DMA queue advance after short OUT */
2069         if (likely (ep->dma)) {
2070                 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2071                         u32     count;
2072                         int     stopped = ep->stopped;
2073
2074                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2075                          * we expect (N <= maxpacket) bytes; host wrote M.
2076                          * iff (M < N) we won't ever see a DMA interrupt.
2077                          */
2078                         ep->stopped = 1;
2079                         for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2080
2081                                 /* any preceding dma transfers must finish.
2082                                  * dma handles (M >= N), may empty the queue
2083                                  */
2084                                 scan_dma_completions (ep);
2085                                 if (unlikely (list_empty (&ep->queue)
2086                                                 || ep->out_overflow)) {
2087                                         req = NULL;
2088                                         break;
2089                                 }
2090                                 req = list_entry (ep->queue.next,
2091                                         struct net2280_request, queue);
2092
2093                                 /* here either (M < N), a "real" short rx;
2094                                  * or (M == N) and the queue didn't empty
2095                                  */
2096                                 if (likely (t & (1 << FIFO_EMPTY))) {
2097                                         count = readl (&ep->dma->dmacount);
2098                                         count &= DMA_BYTE_COUNT_MASK;
2099                                         if (readl (&ep->dma->dmadesc)
2100                                                         != req->td_dma)
2101                                                 req = NULL;
2102                                         break;
2103                                 }
2104                                 udelay(1);
2105                         }
2106
2107                         /* stop DMA, leave ep NAKing */
2108                         writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2109                         spin_stop_dma (ep->dma);
2110
2111                         if (likely (req)) {
2112                                 req->td->dmacount = 0;
2113                                 t = readl (&ep->regs->ep_avail);
2114                                 dma_done (ep, req, count,
2115                                         (ep->out_overflow || t)
2116                                                 ? -EOVERFLOW : 0);
2117                         }
2118
2119                         /* also flush to prevent erratum 0106 trouble */
2120                         if (unlikely (ep->out_overflow
2121                                         || (ep->dev->chiprev == 0x0100
2122                                                 && ep->dev->gadget.speed
2123                                                         == USB_SPEED_FULL))) {
2124                                 out_flush (ep);
2125                                 ep->out_overflow = 0;
2126                         }
2127
2128                         /* (re)start dma if needed, stop NAKing */
2129                         ep->stopped = stopped;
2130                         if (!list_empty (&ep->queue))
2131                                 restart_dma (ep);
2132                 } else
2133                         DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2134                                         ep->ep.name, t);
2135                 return;
2136
2137         /* data packet(s) received (in the fifo, OUT) */
2138         } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2139                 if (read_fifo (ep, req) && ep->num != 0)
2140                         mode = 2;
2141
2142         /* data packet(s) transmitted (IN) */
2143         } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2144                 unsigned        len;
2145
2146                 len = req->req.length - req->req.actual;
2147                 if (len > ep->ep.maxpacket)
2148                         len = ep->ep.maxpacket;
2149                 req->req.actual += len;
2150
2151                 /* if we wrote it all, we're usually done */
2152                 if (req->req.actual == req->req.length) {
2153                         if (ep->num == 0) {
2154                                 /* send zlps until the status stage */
2155                         } else if (!req->req.zero || len != ep->ep.maxpacket)
2156                                 mode = 2;
2157                 }
2158
2159         /* there was nothing to do ...  */
2160         } else if (mode == 1)
2161                 return;
2162
2163         /* done */
2164         if (mode == 2) {
2165                 /* stream endpoints often resubmit/unlink in completion */
2166                 done (ep, req, 0);
2167
2168                 /* maybe advance queue to next request */
2169                 if (ep->num == 0) {
2170                         /* NOTE:  net2280 could let gadget driver start the
2171                          * status stage later. since not all controllers let
2172                          * them control that, the api doesn't (yet) allow it.
2173                          */
2174                         if (!ep->stopped)
2175                                 allow_status (ep);
2176                         req = NULL;
2177                 } else {
2178                         if (!list_empty (&ep->queue) && !ep->stopped)
2179                                 req = list_entry (ep->queue.next,
2180                                         struct net2280_request, queue);
2181                         else
2182                                 req = NULL;
2183                         if (req && !ep->is_in)
2184                                 stop_out_naking (ep);
2185                 }
2186         }
2187
2188         /* is there a buffer for the next packet?
2189          * for best streaming performance, make sure there is one.
2190          */
2191         if (req && !ep->stopped) {
2192
2193                 /* load IN fifo with next packet (may be zlp) */
2194                 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2195                         write_fifo (ep, &req->req);
2196         }
2197 }
2198
2199 static struct net2280_ep *
2200 get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2201 {
2202         struct net2280_ep       *ep;
2203
2204         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2205                 return &dev->ep [0];
2206         list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2207                 u8      bEndpointAddress;
2208
2209                 if (!ep->desc)
2210                         continue;
2211                 bEndpointAddress = ep->desc->bEndpointAddress;
2212                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2213                         continue;
2214                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2215                         return ep;
2216         }
2217         return NULL;
2218 }
2219
2220 static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2221 {
2222         struct net2280_ep       *ep;
2223         u32                     num, scratch;
2224
2225         /* most of these don't need individual acks */
2226         stat &= ~(1 << INTA_ASSERTED);
2227         if (!stat)
2228                 return;
2229         // DEBUG (dev, "irqstat0 %04x\n", stat);
2230
2231         /* starting a control request? */
2232         if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2233                 union {
2234                         u32                     raw [2];
2235                         struct usb_ctrlrequest  r;
2236                 } u;
2237                 int                             tmp;
2238                 struct net2280_request          *req;
2239
2240                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2241                         if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2242                                 dev->gadget.speed = USB_SPEED_HIGH;
2243                         else
2244                                 dev->gadget.speed = USB_SPEED_FULL;
2245                         net2280_led_speed (dev, dev->gadget.speed);
2246                         DEBUG(dev, "%s\n", usb_speed_string(dev->gadget.speed));
2247                 }
2248
2249                 ep = &dev->ep [0];
2250                 ep->irqs++;
2251
2252                 /* make sure any leftover request state is cleared */
2253                 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2254                 while (!list_empty (&ep->queue)) {
2255                         req = list_entry (ep->queue.next,
2256                                         struct net2280_request, queue);
2257                         done (ep, req, (req->req.actual == req->req.length)
2258                                                 ? 0 : -EPROTO);
2259                 }
2260                 ep->stopped = 0;
2261                 dev->protocol_stall = 0;
2262
2263                 if (ep->dev->pdev->device == 0x2280)
2264                         tmp = (1 << FIFO_OVERFLOW)
2265                                 | (1 << FIFO_UNDERFLOW);
2266                 else
2267                         tmp = 0;
2268
2269                 writel (tmp | (1 << TIMEOUT)
2270                         | (1 << USB_STALL_SENT)
2271                         | (1 << USB_IN_NAK_SENT)
2272                         | (1 << USB_IN_ACK_RCVD)
2273                         | (1 << USB_OUT_PING_NAK_SENT)
2274                         | (1 << USB_OUT_ACK_SENT)
2275                         | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2276                         | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2277                         | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2278                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2279                         | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2280                         | (1 << DATA_IN_TOKEN_INTERRUPT)
2281                         , &ep->regs->ep_stat);
2282                 u.raw [0] = readl (&dev->usb->setup0123);
2283                 u.raw [1] = readl (&dev->usb->setup4567);
2284
2285                 cpu_to_le32s (&u.raw [0]);
2286                 cpu_to_le32s (&u.raw [1]);
2287
2288                 tmp = 0;
2289
2290 #define w_value         le16_to_cpu(u.r.wValue)
2291 #define w_index         le16_to_cpu(u.r.wIndex)
2292 #define w_length        le16_to_cpu(u.r.wLength)
2293
2294                 /* ack the irq */
2295                 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2296                 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2297
2298                 /* watch control traffic at the token level, and force
2299                  * synchronization before letting the status stage happen.
2300                  * FIXME ignore tokens we'll NAK, until driver responds.
2301                  * that'll mean a lot less irqs for some drivers.
2302                  */
2303                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2304                 if (ep->is_in) {
2305                         scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2306                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2307                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2308                         stop_out_naking (ep);
2309                 } else
2310                         scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2311                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2312                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2313                 writel (scratch, &dev->epregs [0].ep_irqenb);
2314
2315                 /* we made the hardware handle most lowlevel requests;
2316                  * everything else goes uplevel to the gadget code.
2317                  */
2318                 ep->responded = 1;
2319                 switch (u.r.bRequest) {
2320                 case USB_REQ_GET_STATUS: {
2321                         struct net2280_ep       *e;
2322                         __le32                  status;
2323
2324                         /* hw handles device and interface status */
2325                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2326                                 goto delegate;
2327                         if ((e = get_ep_by_addr (dev, w_index)) == NULL
2328                                         || w_length > 2)
2329                                 goto do_stall;
2330
2331                         if (readl (&e->regs->ep_rsp)
2332                                         & (1 << SET_ENDPOINT_HALT))
2333                                 status = cpu_to_le32 (1);
2334                         else
2335                                 status = cpu_to_le32 (0);
2336
2337                         /* don't bother with a request object! */
2338                         writel (0, &dev->epregs [0].ep_irqenb);
2339                         set_fifo_bytecount (ep, w_length);
2340                         writel ((__force u32)status, &dev->epregs [0].ep_data);
2341                         allow_status (ep);
2342                         VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2343                         goto next_endpoints;
2344                         }
2345                         break;
2346                 case USB_REQ_CLEAR_FEATURE: {
2347                         struct net2280_ep       *e;
2348
2349                         /* hw handles device features */
2350                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2351                                 goto delegate;
2352                         if (w_value != USB_ENDPOINT_HALT
2353                                         || w_length != 0)
2354                                 goto do_stall;
2355                         if ((e = get_ep_by_addr (dev, w_index)) == NULL)
2356                                 goto do_stall;
2357                         if (e->wedged) {
2358                                 VDEBUG(dev, "%s wedged, halt not cleared\n",
2359                                                 ep->ep.name);
2360                         } else {
2361                                 VDEBUG(dev, "%s clear halt\n", ep->ep.name);
2362                                 clear_halt(e);
2363                         }
2364                         allow_status (ep);
2365                         goto next_endpoints;
2366                         }
2367                         break;
2368                 case USB_REQ_SET_FEATURE: {
2369                         struct net2280_ep       *e;
2370
2371                         /* hw handles device features */
2372                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2373                                 goto delegate;
2374                         if (w_value != USB_ENDPOINT_HALT
2375                                         || w_length != 0)
2376                                 goto do_stall;
2377                         if ((e = get_ep_by_addr (dev, w_index)) == NULL)
2378                                 goto do_stall;
2379                         if (e->ep.name == ep0name)
2380                                 goto do_stall;
2381                         set_halt (e);
2382                         allow_status (ep);
2383                         VDEBUG (dev, "%s set halt\n", ep->ep.name);
2384                         goto next_endpoints;
2385                         }
2386                         break;
2387                 default:
2388 delegate:
2389                         VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x "
2390                                 "ep_cfg %08x\n",
2391                                 u.r.bRequestType, u.r.bRequest,
2392                                 w_value, w_index, w_length,
2393                                 readl (&ep->regs->ep_cfg));
2394                         ep->responded = 0;
2395                         spin_unlock (&dev->lock);
2396                         tmp = dev->driver->setup (&dev->gadget, &u.r);
2397                         spin_lock (&dev->lock);
2398                 }
2399
2400                 /* stall ep0 on error */
2401                 if (tmp < 0) {
2402 do_stall:
2403                         VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2404                                         u.r.bRequestType, u.r.bRequest, tmp);
2405                         dev->protocol_stall = 1;
2406                 }
2407
2408                 /* some in/out token irq should follow; maybe stall then.
2409                  * driver must queue a request (even zlp) or halt ep0
2410                  * before the host times out.
2411                  */
2412         }
2413
2414 #undef  w_value
2415 #undef  w_index
2416 #undef  w_length
2417
2418 next_endpoints:
2419         /* endpoint data irq ? */
2420         scratch = stat & 0x7f;
2421         stat &= ~0x7f;
2422         for (num = 0; scratch; num++) {
2423                 u32             t;
2424
2425                 /* do this endpoint's FIFO and queue need tending? */
2426                 t = 1 << num;
2427                 if ((scratch & t) == 0)
2428                         continue;
2429                 scratch ^= t;
2430
2431                 ep = &dev->ep [num];
2432                 handle_ep_small (ep);
2433         }
2434
2435         if (stat)
2436                 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2437 }
2438
2439 #define DMA_INTERRUPTS ( \
2440                   (1 << DMA_D_INTERRUPT) \
2441                 | (1 << DMA_C_INTERRUPT) \
2442                 | (1 << DMA_B_INTERRUPT) \
2443                 | (1 << DMA_A_INTERRUPT))
2444 #define PCI_ERROR_INTERRUPTS ( \
2445                   (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2446                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2447                 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2448
2449 static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2450 {
2451         struct net2280_ep       *ep;
2452         u32                     tmp, num, mask, scratch;
2453
2454         /* after disconnect there's nothing else to do! */
2455         tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2456         mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2457
2458         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
2459          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
2460          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
2461          * only indicates a change in the reset state).
2462          */
2463         if (stat & tmp) {
2464                 writel (tmp, &dev->regs->irqstat1);
2465                 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2466                                         && ((readl (&dev->usb->usbstat) & mask)
2467                                                         == 0))
2468                                 || ((readl (&dev->usb->usbctl)
2469                                         & (1 << VBUS_PIN)) == 0)
2470                             ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2471                         DEBUG (dev, "disconnect %s\n",
2472                                         dev->driver->driver.name);
2473                         stop_activity (dev, dev->driver);
2474                         ep0_start (dev);
2475                         return;
2476                 }
2477                 stat &= ~tmp;
2478
2479                 /* vBUS can bounce ... one of many reasons to ignore the
2480                  * notion of hotplug events on bus connect/disconnect!
2481                  */
2482                 if (!stat)
2483                         return;
2484         }
2485
2486         /* NOTE: chip stays in PCI D0 state for now, but it could
2487          * enter D1 to save more power
2488          */
2489         tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2490         if (stat & tmp) {
2491                 writel (tmp, &dev->regs->irqstat1);
2492                 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2493                         if (dev->driver->suspend)
2494                                 dev->driver->suspend (&dev->gadget);
2495                         if (!enable_suspend)
2496                                 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2497                 } else {
2498                         if (dev->driver->resume)
2499                                 dev->driver->resume (&dev->gadget);
2500                         /* at high speed, note erratum 0133 */
2501                 }
2502                 stat &= ~tmp;
2503         }
2504
2505         /* clear any other status/irqs */
2506         if (stat)
2507                 writel (stat, &dev->regs->irqstat1);
2508
2509         /* some status we can just ignore */
2510         if (dev->pdev->device == 0x2280)
2511                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2512                           | (1 << SUSPEND_REQUEST_INTERRUPT)
2513                           | (1 << RESUME_INTERRUPT)
2514                           | (1 << SOF_INTERRUPT));
2515         else
2516                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2517                           | (1 << RESUME_INTERRUPT)
2518                           | (1 << SOF_DOWN_INTERRUPT)
2519                           | (1 << SOF_INTERRUPT));
2520
2521         if (!stat)
2522                 return;
2523         // DEBUG (dev, "irqstat1 %08x\n", stat);
2524
2525         /* DMA status, for ep-{a,b,c,d} */
2526         scratch = stat & DMA_INTERRUPTS;
2527         stat &= ~DMA_INTERRUPTS;
2528         scratch >>= 9;
2529         for (num = 0; scratch; num++) {
2530                 struct net2280_dma_regs __iomem *dma;
2531
2532                 tmp = 1 << num;
2533                 if ((tmp & scratch) == 0)
2534                         continue;
2535                 scratch ^= tmp;
2536
2537                 ep = &dev->ep [num + 1];
2538                 dma = ep->dma;
2539
2540                 if (!dma)
2541                         continue;
2542
2543                 /* clear ep's dma status */
2544                 tmp = readl (&dma->dmastat);
2545                 writel (tmp, &dma->dmastat);
2546
2547                 /* chaining should stop on abort, short OUT from fifo,
2548                  * or (stat0 codepath) short OUT transfer.
2549                  */
2550                 if (!use_dma_chaining) {
2551                         if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2552                                         == 0) {
2553                                 DEBUG (ep->dev, "%s no xact done? %08x\n",
2554                                         ep->ep.name, tmp);
2555                                 continue;
2556                         }
2557                         stop_dma (ep->dma);
2558                 }
2559
2560                 /* OUT transfers terminate when the data from the
2561                  * host is in our memory.  Process whatever's done.
2562                  * On this path, we know transfer's last packet wasn't
2563                  * less than req->length. NAK_OUT_PACKETS may be set,
2564                  * or the FIFO may already be holding new packets.
2565                  *
2566                  * IN transfers can linger in the FIFO for a very
2567                  * long time ... we ignore that for now, accounting
2568                  * precisely (like PIO does) needs per-packet irqs
2569                  */
2570                 scan_dma_completions (ep);
2571
2572                 /* disable dma on inactive queues; else maybe restart */
2573                 if (list_empty (&ep->queue)) {
2574                         if (use_dma_chaining)
2575                                 stop_dma (ep->dma);
2576                 } else {
2577                         tmp = readl (&dma->dmactl);
2578                         if (!use_dma_chaining
2579                                         || (tmp & (1 << DMA_ENABLE)) == 0)
2580                                 restart_dma (ep);
2581                         else if (ep->is_in && use_dma_chaining) {
2582                                 struct net2280_request  *req;
2583                                 __le32                  dmacount;
2584
2585                                 /* the descriptor at the head of the chain
2586                                  * may still have VALID_BIT clear; that's
2587                                  * used to trigger changing DMA_FIFO_VALIDATE
2588                                  * (affects automagic zlp writes).
2589                                  */
2590                                 req = list_entry (ep->queue.next,
2591                                                 struct net2280_request, queue);
2592                                 dmacount = req->td->dmacount;
2593                                 dmacount &= cpu_to_le32 (
2594                                                 (1 << VALID_BIT)
2595                                                 | DMA_BYTE_COUNT_MASK);
2596                                 if (dmacount && (dmacount & valid_bit) == 0)
2597                                         restart_dma (ep);
2598                         }
2599                 }
2600                 ep->irqs++;
2601         }
2602
2603         /* NOTE:  there are other PCI errors we might usefully notice.
2604          * if they appear very often, here's where to try recovering.
2605          */
2606         if (stat & PCI_ERROR_INTERRUPTS) {
2607                 ERROR (dev, "pci dma error; stat %08x\n", stat);
2608                 stat &= ~PCI_ERROR_INTERRUPTS;
2609                 /* these are fatal errors, but "maybe" they won't
2610                  * happen again ...
2611                  */
2612                 stop_activity (dev, dev->driver);
2613                 ep0_start (dev);
2614                 stat = 0;
2615         }
2616
2617         if (stat)
2618                 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2619 }
2620
2621 static irqreturn_t net2280_irq (int irq, void *_dev)
2622 {
2623         struct net2280          *dev = _dev;
2624
2625         /* shared interrupt, not ours */
2626         if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2627                 return IRQ_NONE;
2628
2629         spin_lock (&dev->lock);
2630
2631         /* handle disconnect, dma, and more */
2632         handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2633
2634         /* control requests and PIO */
2635         handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2636
2637         spin_unlock (&dev->lock);
2638
2639         return IRQ_HANDLED;
2640 }
2641
2642 /*-------------------------------------------------------------------------*/
2643
2644 static void gadget_release (struct device *_dev)
2645 {
2646         struct net2280  *dev = dev_get_drvdata (_dev);
2647
2648         kfree (dev);
2649 }
2650
2651 /* tear down the binding between this driver and the pci device */
2652
2653 static void net2280_remove (struct pci_dev *pdev)
2654 {
2655         struct net2280          *dev = pci_get_drvdata (pdev);
2656
2657         usb_del_gadget_udc(&dev->gadget);
2658
2659         BUG_ON(dev->driver);
2660
2661         /* then clean up the resources we allocated during probe() */
2662         net2280_led_shutdown (dev);
2663         if (dev->requests) {
2664                 int             i;
2665                 for (i = 1; i < 5; i++) {
2666                         if (!dev->ep [i].dummy)
2667                                 continue;
2668                         pci_pool_free (dev->requests, dev->ep [i].dummy,
2669                                         dev->ep [i].td_dma);
2670                 }
2671                 pci_pool_destroy (dev->requests);
2672         }
2673         if (dev->got_irq)
2674                 free_irq (pdev->irq, dev);
2675         if (dev->regs)
2676                 iounmap (dev->regs);
2677         if (dev->region)
2678                 release_mem_region (pci_resource_start (pdev, 0),
2679                                 pci_resource_len (pdev, 0));
2680         if (dev->enabled)
2681                 pci_disable_device (pdev);
2682         device_remove_file (&pdev->dev, &dev_attr_registers);
2683
2684         INFO (dev, "unbind\n");
2685 }
2686
2687 /* wrap this driver around the specified device, but
2688  * don't respond over USB until a gadget driver binds to us.
2689  */
2690
2691 static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2692 {
2693         struct net2280          *dev;
2694         unsigned long           resource, len;
2695         void                    __iomem *base = NULL;
2696         int                     retval, i;
2697
2698         /* alloc, and start init */
2699         dev = kzalloc (sizeof *dev, GFP_KERNEL);
2700         if (dev == NULL){
2701                 retval = -ENOMEM;
2702                 goto done;
2703         }
2704
2705         pci_set_drvdata (pdev, dev);
2706         spin_lock_init (&dev->lock);
2707         dev->pdev = pdev;
2708         dev->gadget.ops = &net2280_ops;
2709         dev->gadget.max_speed = USB_SPEED_HIGH;
2710
2711         /* the "gadget" abstracts/virtualizes the controller */
2712         dev->gadget.name = driver_name;
2713
2714         /* now all the pci goodies ... */
2715         if (pci_enable_device (pdev) < 0) {
2716                 retval = -ENODEV;
2717                 goto done;
2718         }
2719         dev->enabled = 1;
2720
2721         /* BAR 0 holds all the registers
2722          * BAR 1 is 8051 memory; unused here (note erratum 0103)
2723          * BAR 2 is fifo memory; unused here
2724          */
2725         resource = pci_resource_start (pdev, 0);
2726         len = pci_resource_len (pdev, 0);
2727         if (!request_mem_region (resource, len, driver_name)) {
2728                 DEBUG (dev, "controller already in use\n");
2729                 retval = -EBUSY;
2730                 goto done;
2731         }
2732         dev->region = 1;
2733
2734         /* FIXME provide firmware download interface to put
2735          * 8051 code into the chip, e.g. to turn on PCI PM.
2736          */
2737
2738         base = ioremap_nocache (resource, len);
2739         if (base == NULL) {
2740                 DEBUG (dev, "can't map memory\n");
2741                 retval = -EFAULT;
2742                 goto done;
2743         }
2744         dev->regs = (struct net2280_regs __iomem *) base;
2745         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2746         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2747         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2748         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2749         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2750
2751         /* put into initial config, link up all endpoints */
2752         writel (0, &dev->usb->usbctl);
2753         usb_reset (dev);
2754         usb_reinit (dev);
2755
2756         /* irq setup after old hardware is cleaned up */
2757         if (!pdev->irq) {
2758                 ERROR (dev, "No IRQ.  Check PCI setup!\n");
2759                 retval = -ENODEV;
2760                 goto done;
2761         }
2762
2763         if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
2764                         != 0) {
2765                 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
2766                 retval = -EBUSY;
2767                 goto done;
2768         }
2769         dev->got_irq = 1;
2770
2771         /* DMA setup */
2772         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
2773         dev->requests = pci_pool_create ("requests", pdev,
2774                 sizeof (struct net2280_dma),
2775                 0 /* no alignment requirements */,
2776                 0 /* or page-crossing issues */);
2777         if (!dev->requests) {
2778                 DEBUG (dev, "can't get request pool\n");
2779                 retval = -ENOMEM;
2780                 goto done;
2781         }
2782         for (i = 1; i < 5; i++) {
2783                 struct net2280_dma      *td;
2784
2785                 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2786                                 &dev->ep [i].td_dma);
2787                 if (!td) {
2788                         DEBUG (dev, "can't get dummy %d\n", i);
2789                         retval = -ENOMEM;
2790                         goto done;
2791                 }
2792                 td->dmacount = 0;       /* not VALID */
2793                 td->dmadesc = td->dmaaddr;
2794                 dev->ep [i].dummy = td;
2795         }
2796
2797         /* enable lower-overhead pci memory bursts during DMA */
2798         writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2799                         // 256 write retries may not be enough...
2800                         // | (1 << PCI_RETRY_ABORT_ENABLE)
2801                         | (1 << DMA_READ_MULTIPLE_ENABLE)
2802                         | (1 << DMA_READ_LINE_ENABLE)
2803                         , &dev->pci->pcimstctl);
2804         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2805         pci_set_master (pdev);
2806         pci_try_set_mwi (pdev);
2807
2808         /* ... also flushes any posted pci writes */
2809         dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2810
2811         /* done */
2812         INFO (dev, "%s\n", driver_desc);
2813         INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2814                         pdev->irq, base, dev->chiprev);
2815         INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2816                         use_dma
2817                                 ? (use_dma_chaining ? "chaining" : "enabled")
2818                                 : "disabled");
2819         retval = device_create_file (&pdev->dev, &dev_attr_registers);
2820         if (retval) goto done;
2821
2822         retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
2823                         gadget_release);
2824         if (retval)
2825                 goto done;
2826         return 0;
2827
2828 done:
2829         if (dev)
2830                 net2280_remove (pdev);
2831         return retval;
2832 }
2833
2834 /* make sure the board is quiescent; otherwise it will continue
2835  * generating IRQs across the upcoming reboot.
2836  */
2837
2838 static void net2280_shutdown (struct pci_dev *pdev)
2839 {
2840         struct net2280          *dev = pci_get_drvdata (pdev);
2841
2842         /* disable IRQs */
2843         writel (0, &dev->regs->pciirqenb0);
2844         writel (0, &dev->regs->pciirqenb1);
2845
2846         /* disable the pullup so the host will think we're gone */
2847         writel (0, &dev->usb->usbctl);
2848
2849         /* Disable full-speed test mode */
2850         writel(0, &dev->usb->xcvrdiag);
2851 }
2852
2853
2854 /*-------------------------------------------------------------------------*/
2855
2856 static const struct pci_device_id pci_ids [] = { {
2857         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2858         .class_mask =   ~0,
2859         .vendor =       0x17cc,
2860         .device =       0x2280,
2861         .subvendor =    PCI_ANY_ID,
2862         .subdevice =    PCI_ANY_ID,
2863 }, {
2864         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2865         .class_mask =   ~0,
2866         .vendor =       0x17cc,
2867         .device =       0x2282,
2868         .subvendor =    PCI_ANY_ID,
2869         .subdevice =    PCI_ANY_ID,
2870
2871 }, { /* end: all zeroes */ }
2872 };
2873 MODULE_DEVICE_TABLE (pci, pci_ids);
2874
2875 /* pci driver glue; this is a "new style" PCI driver module */
2876 static struct pci_driver net2280_pci_driver = {
2877         .name =         (char *) driver_name,
2878         .id_table =     pci_ids,
2879
2880         .probe =        net2280_probe,
2881         .remove =       net2280_remove,
2882         .shutdown =     net2280_shutdown,
2883
2884         /* FIXME add power management support */
2885 };
2886
2887 MODULE_DESCRIPTION (DRIVER_DESC);
2888 MODULE_AUTHOR ("David Brownell");
2889 MODULE_LICENSE ("GPL");
2890
2891 static int __init init (void)
2892 {
2893         if (!use_dma)
2894                 use_dma_chaining = 0;
2895         return pci_register_driver (&net2280_pci_driver);
2896 }
2897 module_init (init);
2898
2899 static void __exit cleanup (void)
2900 {
2901         pci_unregister_driver (&net2280_pci_driver);
2902 }
2903 module_exit (cleanup);