uboot/drivers/usb/gadget/at91_udc.c
<<
>>
Prefs
   1/*
   2 * from linux:
   3 * c94e289f195e: usb: gadget: remove incorrect __init/__exit annotations
   4 *
   5 * at91_udc -- driver for at91-series USB peripheral controller
   6 *
   7 * Copyright (C) 2004 by Thomas Rathbone
   8 * Copyright (C) 2005 by HP Labs
   9 * Copyright (C) 2005 by David Brownell
  10 *
  11 * SPDX-License-Identifier:     GPL-2.0+
  12 */
  13
  14#undef  VERBOSE_DEBUG
  15#undef  PACKET_TRACE
  16
  17#include <common.h>
  18#include <linux/errno.h>
  19#include <asm/io.h>
  20#include <asm/gpio.h>
  21#include <asm/hardware.h>
  22#include <mach/at91_matrix.h>
  23#include <linux/list.h>
  24#include <linux/usb/ch9.h>
  25#include <linux/usb/gadget.h>
  26#include <linux/usb/at91_udc.h>
  27#include <malloc.h>
  28#include <usb/lin_gadget_compat.h>
  29
  30#include "at91_udc.h"
  31
  32/*
  33 * This controller is simple and PIO-only.  It's used in many AT91-series
  34 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
  35 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
  36 *
  37 * This driver expects the board has been wired with two GPIOs supporting
  38 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
  39 * testing hasn't covered such cases.)
  40 *
  41 * The pullup is most important (so it's integrated on sam926x parts).  It
  42 * provides software control over whether the host enumerates the device.
  43 *
  44 * The VBUS sensing helps during enumeration, and allows both USB clocks
  45 * (and the transceiver) to stay gated off until they're necessary, saving
  46 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
  47 * it may also be gated off by software during some Linux sleep states.
  48 */
  49
  50#define DRIVER_VERSION  "3 May 2006"
  51
  52static const char driver_name [] = "at91_udc";
  53static const char * const ep_names[] = {
  54        "ep0",
  55        "ep1",
  56        "ep2",
  57        "ep3-int",
  58        "ep4",
  59        "ep5",
  60};
  61#define ep0name         ep_names[0]
  62
  63#define at91_udp_read(udc, reg) \
  64        __raw_readl((udc)->udp_baseaddr + (reg))
  65#define at91_udp_write(udc, reg, val) \
  66        __raw_writel((val), (udc)->udp_baseaddr + (reg))
  67
  68static struct at91_udc *controller;
  69
  70/*-------------------------------------------------------------------------*/
  71
  72static void done(struct at91_ep *ep, struct at91_request *req, int status)
  73{
  74        unsigned        stopped = ep->stopped;
  75        struct at91_udc *udc = ep->udc;
  76
  77        list_del_init(&req->queue);
  78        if (req->req.status == -EINPROGRESS)
  79                req->req.status = status;
  80        else
  81                status = req->req.status;
  82        if (status && status != -ESHUTDOWN)
  83                VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
  84
  85        ep->stopped = 1;
  86        spin_unlock(&udc->lock);
  87        req->req.complete(&ep->ep, &req->req);
  88        spin_lock(&udc->lock);
  89        ep->stopped = stopped;
  90
  91        /* ep0 is always ready; other endpoints need a non-empty queue */
  92        if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
  93                at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
  94}
  95
  96/*-------------------------------------------------------------------------*/
  97
  98/* bits indicating OUT fifo has data ready */
  99#define RX_DATA_READY   (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
 100
 101/*
 102 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 103 * back most of the value you just read (because of side effects, including
 104 * bits that may change after reading and before writing).
 105 *
 106 * Except when changing a specific bit, always write values which:
 107 *  - clear SET_FX bits (setting them could change something)
 108 *  - set CLR_FX bits (clearing them could change something)
 109 *
 110 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 111 * that shouldn't normally be changed.
 112 *
 113 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 114 * implying a need to wait for one write to complete (test relevant bits)
 115 * before starting the next write.  This shouldn't be an issue given how
 116 * infrequently we write, except maybe for write-then-read idioms.
 117 */
 118#define SET_FX  (AT91_UDP_TXPKTRDY)
 119#define CLR_FX  (RX_DATA_READY | AT91_UDP_RXSETUP \
 120                | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
 121
 122/* pull OUT packet data from the endpoint's fifo */
 123static int read_fifo (struct at91_ep *ep, struct at91_request *req)
 124{
 125        u32 __iomem     *creg = ep->creg;
 126        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 127        u32             csr;
 128        u8              *buf;
 129        unsigned int    count, bufferspace, is_done;
 130
 131        buf = req->req.buf + req->req.actual;
 132        bufferspace = req->req.length - req->req.actual;
 133
 134        /*
 135         * there might be nothing to read if ep_queue() calls us,
 136         * or if we already emptied both pingpong buffers
 137         */
 138rescan:
 139        csr = __raw_readl(creg);
 140        if ((csr & RX_DATA_READY) == 0)
 141                return 0;
 142
 143        count = (csr & AT91_UDP_RXBYTECNT) >> 16;
 144        if (count > ep->ep.maxpacket)
 145                count = ep->ep.maxpacket;
 146        if (count > bufferspace) {
 147                DBG("%s buffer overflow\n", ep->ep.name);
 148                req->req.status = -EOVERFLOW;
 149                count = bufferspace;
 150        }
 151        __raw_readsb((unsigned long)dreg, buf, count);
 152
 153        /* release and swap pingpong mem bank */
 154        csr |= CLR_FX;
 155        if (ep->is_pingpong) {
 156                if (ep->fifo_bank == 0) {
 157                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 158                        ep->fifo_bank = 1;
 159                } else {
 160                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
 161                        ep->fifo_bank = 0;
 162                }
 163        } else
 164                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 165        __raw_writel(csr, creg);
 166
 167        req->req.actual += count;
 168        is_done = (count < ep->ep.maxpacket);
 169        if (count == bufferspace)
 170                is_done = 1;
 171
 172        PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
 173                        is_done ? " (done)" : "");
 174
 175        /*
 176         * avoid extra trips through IRQ logic for packets already in
 177         * the fifo ... maybe preventing an extra (expensive) OUT-NAK
 178         */
 179        if (is_done)
 180                done(ep, req, 0);
 181        else if (ep->is_pingpong) {
 182                /*
 183                 * One dummy read to delay the code because of a HW glitch:
 184                 * CSR returns bad RXCOUNT when read too soon after updating
 185                 * RX_DATA_BK flags.
 186                 */
 187                csr = __raw_readl(creg);
 188
 189                bufferspace -= count;
 190                buf += count;
 191                goto rescan;
 192        }
 193
 194        return is_done;
 195}
 196
 197/* load fifo for an IN packet */
 198static int write_fifo(struct at91_ep *ep, struct at91_request *req)
 199{
 200        u32 __iomem     *creg = ep->creg;
 201        u32             csr = __raw_readl(creg);
 202        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 203        unsigned        total, count, is_last;
 204        u8              *buf;
 205
 206        /*
 207         * TODO: allow for writing two packets to the fifo ... that'll
 208         * reduce the amount of IN-NAKing, but probably won't affect
 209         * throughput much.  (Unlike preventing OUT-NAKing!)
 210         */
 211
 212        /*
 213         * If ep_queue() calls us, the queue is empty and possibly in
 214         * odd states like TXCOMP not yet cleared (we do it, saving at
 215         * least one IRQ) or the fifo not yet being free.  Those aren't
 216         * issues normally (IRQ handler fast path).
 217         */
 218        if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
 219                if (csr & AT91_UDP_TXCOMP) {
 220                        csr |= CLR_FX;
 221                        csr &= ~(SET_FX | AT91_UDP_TXCOMP);
 222                        __raw_writel(csr, creg);
 223                        csr = __raw_readl(creg);
 224                }
 225                if (csr & AT91_UDP_TXPKTRDY)
 226                        return 0;
 227        }
 228
 229        buf = req->req.buf + req->req.actual;
 230        prefetch(buf);
 231        total = req->req.length - req->req.actual;
 232        if (ep->ep.maxpacket < total) {
 233                count = ep->ep.maxpacket;
 234                is_last = 0;
 235        } else {
 236                count = total;
 237                is_last = (count < ep->ep.maxpacket) || !req->req.zero;
 238        }
 239
 240        /*
 241         * Write the packet, maybe it's a ZLP.
 242         *
 243         * NOTE:  incrementing req->actual before we receive the ACK means
 244         * gadget driver IN bytecounts can be wrong in fault cases.  That's
 245         * fixable with PIO drivers like this one (save "count" here, and
 246         * do the increment later on TX irq), but not for most DMA hardware.
 247         *
 248         * So all gadget drivers must accept that potential error.  Some
 249         * hardware supports precise fifo status reporting, letting them
 250         * recover when the actual bytecount matters (e.g. for USB Test
 251         * and Measurement Class devices).
 252         */
 253        __raw_writesb((unsigned long)dreg, buf, count);
 254        csr &= ~SET_FX;
 255        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
 256        __raw_writel(csr, creg);
 257        req->req.actual += count;
 258
 259        PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
 260                        is_last ? " (done)" : "");
 261        if (is_last)
 262                done(ep, req, 0);
 263        return is_last;
 264}
 265
 266static void nuke(struct at91_ep *ep, int status)
 267{
 268        struct at91_request *req;
 269
 270        /* terminate any request in the queue */
 271        ep->stopped = 1;
 272        if (list_empty(&ep->queue))
 273                return;
 274
 275        VDBG("%s %s\n", __func__, ep->ep.name);
 276        while (!list_empty(&ep->queue)) {
 277                req = list_entry(ep->queue.next, struct at91_request, queue);
 278                done(ep, req, status);
 279        }
 280}
 281
 282/*-------------------------------------------------------------------------*/
 283
 284static int at91_ep_enable(struct usb_ep *_ep,
 285                                const struct usb_endpoint_descriptor *desc)
 286{
 287        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 288        struct at91_udc *udc;
 289        u16             maxpacket;
 290        u32             tmp;
 291        unsigned long   flags;
 292
 293        if (!_ep || !ep
 294                        || !desc || _ep->name == ep0name
 295                        || desc->bDescriptorType != USB_DT_ENDPOINT
 296                        || (maxpacket = usb_endpoint_maxp(desc)) == 0
 297                        || maxpacket > ep->maxpacket) {
 298                DBG("bad ep or descriptor\n");
 299                return -EINVAL;
 300        }
 301
 302        udc = ep->udc;
 303        if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 304                DBG("bogus device state\n");
 305                return -ESHUTDOWN;
 306        }
 307
 308        tmp = usb_endpoint_type(desc);
 309        switch (tmp) {
 310        case USB_ENDPOINT_XFER_CONTROL:
 311                DBG("only one control endpoint\n");
 312                return -EINVAL;
 313        case USB_ENDPOINT_XFER_INT:
 314                if (maxpacket > 64)
 315                        goto bogus_max;
 316                break;
 317        case USB_ENDPOINT_XFER_BULK:
 318                switch (maxpacket) {
 319                case 8:
 320                case 16:
 321                case 32:
 322                case 64:
 323                        goto ok;
 324                }
 325bogus_max:
 326                DBG("bogus maxpacket %d\n", maxpacket);
 327                return -EINVAL;
 328        case USB_ENDPOINT_XFER_ISOC:
 329                if (!ep->is_pingpong) {
 330                        DBG("iso requires double buffering\n");
 331                        return -EINVAL;
 332                }
 333                break;
 334        }
 335
 336ok:
 337        spin_lock_irqsave(&udc->lock, flags);
 338
 339        /* initialize endpoint to match this descriptor */
 340        ep->is_in = usb_endpoint_dir_in(desc);
 341        ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
 342        ep->stopped = 0;
 343        if (ep->is_in)
 344                tmp |= 0x04;
 345        tmp <<= 8;
 346        tmp |= AT91_UDP_EPEDS;
 347        __raw_writel(tmp, ep->creg);
 348
 349        ep->ep.maxpacket = maxpacket;
 350
 351        /*
 352         * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
 353         * since endpoint resets don't reset hw pingpong state.
 354         */
 355        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 356        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 357
 358        spin_unlock_irqrestore(&udc->lock, flags);
 359        return 0;
 360}
 361
 362static int at91_ep_disable (struct usb_ep * _ep)
 363{
 364        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 365        struct at91_udc *udc = ep->udc;
 366        unsigned long   flags;
 367
 368        if (ep == &ep->udc->ep[0])
 369                return -EINVAL;
 370
 371        spin_lock_irqsave(&udc->lock, flags);
 372
 373        nuke(ep, -ESHUTDOWN);
 374
 375        /* restore the endpoint's pristine config */
 376        ep->ep.desc = NULL;
 377        ep->ep.maxpacket = ep->maxpacket;
 378
 379        /* reset fifos and endpoint */
 380        if (ep->udc->clocked) {
 381                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 382                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 383                __raw_writel(0, ep->creg);
 384        }
 385
 386        spin_unlock_irqrestore(&udc->lock, flags);
 387        return 0;
 388}
 389
 390/*
 391 * this is a PIO-only driver, so there's nothing
 392 * interesting for request or buffer allocation.
 393 */
 394
 395static struct usb_request *
 396at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 397{
 398        struct at91_request *req;
 399
 400        req = kzalloc(sizeof (struct at91_request), gfp_flags);
 401        if (!req)
 402                return NULL;
 403
 404        INIT_LIST_HEAD(&req->queue);
 405        return &req->req;
 406}
 407
 408static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 409{
 410        struct at91_request *req;
 411
 412        req = container_of(_req, struct at91_request, req);
 413        BUG_ON(!list_empty(&req->queue));
 414        kfree(req);
 415}
 416
 417static int at91_ep_queue(struct usb_ep *_ep,
 418                        struct usb_request *_req, gfp_t gfp_flags)
 419{
 420        struct at91_request     *req;
 421        struct at91_ep          *ep;
 422        struct at91_udc         *udc;
 423        int                     status;
 424        unsigned long           flags;
 425
 426        req = container_of(_req, struct at91_request, req);
 427        ep = container_of(_ep, struct at91_ep, ep);
 428
 429        if (!_req || !_req->complete
 430                        || !_req->buf || !list_empty(&req->queue)) {
 431                DBG("invalid request\n");
 432                return -EINVAL;
 433        }
 434
 435        if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
 436                DBG("invalid ep\n");
 437                return -EINVAL;
 438        }
 439
 440        udc = ep->udc;
 441
 442        if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 443                DBG("invalid device\n");
 444                return -EINVAL;
 445        }
 446
 447        _req->status = -EINPROGRESS;
 448        _req->actual = 0;
 449
 450        spin_lock_irqsave(&udc->lock, flags);
 451
 452        /* try to kickstart any empty and idle queue */
 453        if (list_empty(&ep->queue) && !ep->stopped) {
 454                int     is_ep0;
 455
 456                /*
 457                 * If this control request has a non-empty DATA stage, this
 458                 * will start that stage.  It works just like a non-control
 459                 * request (until the status stage starts, maybe early).
 460                 *
 461                 * If the data stage is empty, then this starts a successful
 462                 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
 463                 */
 464                is_ep0 = (ep->ep.name == ep0name);
 465                if (is_ep0) {
 466                        u32     tmp;
 467
 468                        if (!udc->req_pending) {
 469                                status = -EINVAL;
 470                                goto done;
 471                        }
 472
 473                        /*
 474                         * defer changing CONFG until after the gadget driver
 475                         * reconfigures the endpoints.
 476                         */
 477                        if (udc->wait_for_config_ack) {
 478                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 479                                tmp ^= AT91_UDP_CONFG;
 480                                VDBG("toggle config\n");
 481                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 482                        }
 483                        if (req->req.length == 0) {
 484ep0_in_status:
 485                                PACKET("ep0 in/status\n");
 486                                status = 0;
 487                                tmp = __raw_readl(ep->creg);
 488                                tmp &= ~SET_FX;
 489                                tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
 490                                __raw_writel(tmp, ep->creg);
 491                                udc->req_pending = 0;
 492                                goto done;
 493                        }
 494                }
 495
 496                if (ep->is_in)
 497                        status = write_fifo(ep, req);
 498                else {
 499                        status = read_fifo(ep, req);
 500
 501                        /* IN/STATUS stage is otherwise triggered by irq */
 502                        if (status && is_ep0)
 503                                goto ep0_in_status;
 504                }
 505        } else
 506                status = 0;
 507
 508        if (req && !status) {
 509                list_add_tail (&req->queue, &ep->queue);
 510                at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
 511        }
 512done:
 513        spin_unlock_irqrestore(&udc->lock, flags);
 514        return (status < 0) ? status : 0;
 515}
 516
 517static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 518{
 519        struct at91_ep          *ep;
 520        struct at91_request     *req;
 521        unsigned long           flags;
 522
 523        ep = container_of(_ep, struct at91_ep, ep);
 524        if (!_ep || ep->ep.name == ep0name)
 525                return -EINVAL;
 526
 527        spin_lock_irqsave(&udc->lock, flags);
 528
 529        /* make sure it's actually queued on this endpoint */
 530        list_for_each_entry (req, &ep->queue, queue) {
 531                if (&req->req == _req)
 532                        break;
 533        }
 534        if (&req->req != _req) {
 535                spin_unlock_irqrestore(&udc->lock, flags);
 536                return -EINVAL;
 537        }
 538
 539        done(ep, req, -ECONNRESET);
 540        spin_unlock_irqrestore(&udc->lock, flags);
 541        return 0;
 542}
 543
 544static int at91_ep_set_halt(struct usb_ep *_ep, int value)
 545{
 546        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 547        struct at91_udc *udc = ep->udc;
 548        u32 __iomem     *creg;
 549        u32             csr;
 550        unsigned long   flags;
 551        int             status = 0;
 552
 553        if (!_ep || ep->is_iso || !ep->udc->clocked)
 554                return -EINVAL;
 555
 556        creg = ep->creg;
 557        spin_lock_irqsave(&udc->lock, flags);
 558
 559        csr = __raw_readl(creg);
 560
 561        /*
 562         * fail with still-busy IN endpoints, ensuring correct sequencing
 563         * of data tx then stall.  note that the fifo rx bytecount isn't
 564         * completely accurate as a tx bytecount.
 565         */
 566        if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
 567                status = -EAGAIN;
 568        else {
 569                csr |= CLR_FX;
 570                csr &= ~SET_FX;
 571                if (value) {
 572                        csr |= AT91_UDP_FORCESTALL;
 573                        VDBG("halt %s\n", ep->ep.name);
 574                } else {
 575                        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 576                        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 577                        csr &= ~AT91_UDP_FORCESTALL;
 578                }
 579                __raw_writel(csr, creg);
 580        }
 581
 582        spin_unlock_irqrestore(&udc->lock, flags);
 583        return status;
 584}
 585
 586static const struct usb_ep_ops at91_ep_ops = {
 587        .enable         = at91_ep_enable,
 588        .disable        = at91_ep_disable,
 589        .alloc_request  = at91_ep_alloc_request,
 590        .free_request   = at91_ep_free_request,
 591        .queue          = at91_ep_queue,
 592        .dequeue        = at91_ep_dequeue,
 593        .set_halt       = at91_ep_set_halt,
 594        /* there's only imprecise fifo status reporting */
 595};
 596
 597/*-------------------------------------------------------------------------*/
 598
 599static int at91_get_frame(struct usb_gadget *gadget)
 600{
 601        struct at91_udc *udc = to_udc(gadget);
 602
 603        if (!to_udc(gadget)->clocked)
 604                return -EINVAL;
 605        return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
 606}
 607
 608static int at91_wakeup(struct usb_gadget *gadget)
 609{
 610        struct at91_udc *udc = to_udc(gadget);
 611        u32             glbstate;
 612        int             status = -EINVAL;
 613        unsigned long   flags;
 614
 615        DBG("%s\n", __func__ );
 616        spin_lock_irqsave(&udc->lock, flags);
 617
 618        if (!udc->clocked || !udc->suspended)
 619                goto done;
 620
 621        /* NOTE:  some "early versions" handle ESR differently ... */
 622
 623        glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 624        if (!(glbstate & AT91_UDP_ESR))
 625                goto done;
 626        glbstate |= AT91_UDP_ESR;
 627        at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
 628
 629done:
 630        spin_unlock_irqrestore(&udc->lock, flags);
 631        return status;
 632}
 633
 634/* reinit == restore initial software state */
 635static void udc_reinit(struct at91_udc *udc)
 636{
 637        u32 i;
 638
 639        INIT_LIST_HEAD(&udc->gadget.ep_list);
 640        INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
 641
 642        for (i = 0; i < NUM_ENDPOINTS; i++) {
 643                struct at91_ep *ep = &udc->ep[i];
 644
 645                if (i != 0)
 646                        list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 647                ep->ep.desc = NULL;
 648                ep->stopped = 0;
 649                ep->fifo_bank = 0;
 650                usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
 651                ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
 652                /* initialize one queue per endpoint */
 653                INIT_LIST_HEAD(&ep->queue);
 654        }
 655}
 656
 657static void reset_gadget(struct at91_udc *udc)
 658{
 659        struct usb_gadget_driver *driver = udc->driver;
 660        int i;
 661
 662        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 663                driver = NULL;
 664        udc->gadget.speed = USB_SPEED_UNKNOWN;
 665        udc->suspended = 0;
 666
 667        for (i = 0; i < NUM_ENDPOINTS; i++) {
 668                struct at91_ep *ep = &udc->ep[i];
 669
 670                ep->stopped = 1;
 671                nuke(ep, -ESHUTDOWN);
 672        }
 673        if (driver) {
 674                spin_unlock(&udc->lock);
 675                udc->driver->disconnect(&udc->gadget);
 676                spin_lock(&udc->lock);
 677        }
 678
 679        udc_reinit(udc);
 680}
 681
 682static void stop_activity(struct at91_udc *udc)
 683{
 684        struct usb_gadget_driver *driver = udc->driver;
 685        int i;
 686
 687        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 688                driver = NULL;
 689        udc->gadget.speed = USB_SPEED_UNKNOWN;
 690        udc->suspended = 0;
 691
 692        for (i = 0; i < NUM_ENDPOINTS; i++) {
 693                struct at91_ep *ep = &udc->ep[i];
 694                ep->stopped = 1;
 695                nuke(ep, -ESHUTDOWN);
 696        }
 697        if (driver) {
 698                spin_unlock(&udc->lock);
 699                driver->disconnect(&udc->gadget);
 700                spin_lock(&udc->lock);
 701        }
 702
 703        udc_reinit(udc);
 704}
 705
 706static void clk_on(struct at91_udc *udc)
 707{
 708        if (udc->clocked)
 709                return;
 710        udc->clocked = 1;
 711}
 712
 713static void clk_off(struct at91_udc *udc)
 714{
 715        if (!udc->clocked)
 716                return;
 717        udc->clocked = 0;
 718        udc->gadget.speed = USB_SPEED_UNKNOWN;
 719}
 720
 721/*
 722 * activate/deactivate link with host; minimize power usage for
 723 * inactive links by cutting clocks and transceiver power.
 724 */
 725static void pullup(struct at91_udc *udc, int is_on)
 726{
 727        if (!udc->enabled || !udc->vbus)
 728                is_on = 0;
 729        DBG("%sactive\n", is_on ? "" : "in");
 730
 731        if (is_on) {
 732                clk_on(udc);
 733                at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
 734                at91_udp_write(udc, AT91_UDP_TXVC, 0);
 735        } else {
 736                stop_activity(udc);
 737                at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
 738                at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
 739                clk_off(udc);
 740        }
 741
 742        if (udc->caps && udc->caps->pullup)
 743                udc->caps->pullup(udc, is_on);
 744}
 745
 746/* vbus is here!  turn everything on that's ready */
 747static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
 748{
 749        struct at91_udc *udc = to_udc(gadget);
 750        unsigned long   flags;
 751
 752        /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
 753        spin_lock_irqsave(&udc->lock, flags);
 754        udc->vbus = (is_active != 0);
 755        if (udc->driver)
 756                pullup(udc, is_active);
 757        else
 758                pullup(udc, 0);
 759        spin_unlock_irqrestore(&udc->lock, flags);
 760        return 0;
 761}
 762
 763static int at91_pullup(struct usb_gadget *gadget, int is_on)
 764{
 765        struct at91_udc *udc = to_udc(gadget);
 766        unsigned long   flags;
 767
 768        spin_lock_irqsave(&udc->lock, flags);
 769        udc->enabled = is_on = !!is_on;
 770        pullup(udc, is_on);
 771        spin_unlock_irqrestore(&udc->lock, flags);
 772        return 0;
 773}
 774
 775static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
 776{
 777        struct at91_udc *udc = to_udc(gadget);
 778        unsigned long   flags;
 779
 780        spin_lock_irqsave(&udc->lock, flags);
 781        udc->selfpowered = (is_on != 0);
 782        spin_unlock_irqrestore(&udc->lock, flags);
 783        return 0;
 784}
 785
 786static int at91_start(struct usb_gadget *gadget,
 787                struct usb_gadget_driver *driver);
 788static int at91_stop(struct usb_gadget *gadget);
 789
 790static const struct usb_gadget_ops at91_udc_ops = {
 791        .get_frame              = at91_get_frame,
 792        .wakeup                 = at91_wakeup,
 793        .set_selfpowered        = at91_set_selfpowered,
 794        .vbus_session           = at91_vbus_session,
 795        .pullup                 = at91_pullup,
 796        .udc_start              = at91_start,
 797        .udc_stop               = at91_stop,
 798
 799        /*
 800         * VBUS-powered devices may also also want to support bigger
 801         * power budgets after an appropriate SET_CONFIGURATION.
 802         */
 803        /* .vbus_power          = at91_vbus_power, */
 804};
 805
 806/*-------------------------------------------------------------------------*/
 807
 808static int handle_ep(struct at91_ep *ep)
 809{
 810        struct at91_request     *req;
 811        u32 __iomem             *creg = ep->creg;
 812        u32                     csr = __raw_readl(creg);
 813
 814        if (!list_empty(&ep->queue))
 815                req = list_entry(ep->queue.next,
 816                        struct at91_request, queue);
 817        else
 818                req = NULL;
 819
 820        if (ep->is_in) {
 821                if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
 822                        csr |= CLR_FX;
 823                        csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
 824                        __raw_writel(csr, creg);
 825                }
 826                if (req)
 827                        return write_fifo(ep, req);
 828
 829        } else {
 830                if (csr & AT91_UDP_STALLSENT) {
 831                        /* STALLSENT bit == ISOERR */
 832                        if (ep->is_iso && req)
 833                                req->req.status = -EILSEQ;
 834                        csr |= CLR_FX;
 835                        csr &= ~(SET_FX | AT91_UDP_STALLSENT);
 836                        __raw_writel(csr, creg);
 837                        csr = __raw_readl(creg);
 838                }
 839                if (req && (csr & RX_DATA_READY))
 840                        return read_fifo(ep, req);
 841        }
 842        return 0;
 843}
 844
 845union setup {
 846        u8                      raw[8];
 847        struct usb_ctrlrequest  r;
 848};
 849
 850static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
 851{
 852        u32 __iomem     *creg = ep->creg;
 853        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 854        unsigned        rxcount, i = 0;
 855        u32             tmp;
 856        union setup     pkt;
 857        int             status = 0;
 858
 859        /* read and ack SETUP; hard-fail for bogus packets */
 860        rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
 861        if (likely(rxcount == 8)) {
 862                while (rxcount--)
 863                        pkt.raw[i++] = __raw_readb(dreg);
 864                if (pkt.r.bRequestType & USB_DIR_IN) {
 865                        csr |= AT91_UDP_DIR;
 866                        ep->is_in = 1;
 867                } else {
 868                        csr &= ~AT91_UDP_DIR;
 869                        ep->is_in = 0;
 870                }
 871        } else {
 872                /* REVISIT this happens sometimes under load; why?? */
 873                ERR("SETUP len %d, csr %08x\n", rxcount, csr);
 874                status = -EINVAL;
 875        }
 876        csr |= CLR_FX;
 877        csr &= ~(SET_FX | AT91_UDP_RXSETUP);
 878        __raw_writel(csr, creg);
 879        udc->wait_for_addr_ack = 0;
 880        udc->wait_for_config_ack = 0;
 881        ep->stopped = 0;
 882        if (unlikely(status != 0))
 883                goto stall;
 884
 885#define w_index         le16_to_cpu(pkt.r.wIndex)
 886#define w_value         le16_to_cpu(pkt.r.wValue)
 887#define w_length        le16_to_cpu(pkt.r.wLength)
 888
 889        VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
 890                        pkt.r.bRequestType, pkt.r.bRequest,
 891                        w_value, w_index, w_length);
 892
 893        /*
 894         * A few standard requests get handled here, ones that touch
 895         * hardware ... notably for device and endpoint features.
 896         */
 897        udc->req_pending = 1;
 898        csr = __raw_readl(creg);
 899        csr |= CLR_FX;
 900        csr &= ~SET_FX;
 901        switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
 902
 903        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
 904                        | USB_REQ_SET_ADDRESS:
 905                __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
 906                udc->addr = w_value;
 907                udc->wait_for_addr_ack = 1;
 908                udc->req_pending = 0;
 909                /* FADDR is set later, when we ack host STATUS */
 910                return;
 911
 912        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
 913                        | USB_REQ_SET_CONFIGURATION:
 914                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
 915                if (pkt.r.wValue)
 916                        udc->wait_for_config_ack = (tmp == 0);
 917                else
 918                        udc->wait_for_config_ack = (tmp != 0);
 919                if (udc->wait_for_config_ack)
 920                        VDBG("wait for config\n");
 921                /* CONFG is toggled later, if gadget driver succeeds */
 922                break;
 923
 924        /*
 925         * Hosts may set or clear remote wakeup status, and
 926         * devices may report they're VBUS powered.
 927         */
 928        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
 929                        | USB_REQ_GET_STATUS:
 930                tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
 931                if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
 932                        tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
 933                PACKET("get device status\n");
 934                __raw_writeb(tmp, dreg);
 935                __raw_writeb(0, dreg);
 936                goto write_in;
 937                /* then STATUS starts later, automatically */
 938        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
 939                        | USB_REQ_SET_FEATURE:
 940                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
 941                        goto stall;
 942                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 943                tmp |= AT91_UDP_ESR;
 944                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 945                goto succeed;
 946        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
 947                        | USB_REQ_CLEAR_FEATURE:
 948                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
 949                        goto stall;
 950                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 951                tmp &= ~AT91_UDP_ESR;
 952                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 953                goto succeed;
 954
 955        /*
 956         * Interfaces have no feature settings; this is pretty useless.
 957         * we won't even insist the interface exists...
 958         */
 959        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
 960                        | USB_REQ_GET_STATUS:
 961                PACKET("get interface status\n");
 962                __raw_writeb(0, dreg);
 963                __raw_writeb(0, dreg);
 964                goto write_in;
 965                /* then STATUS starts later, automatically */
 966        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
 967                        | USB_REQ_SET_FEATURE:
 968        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
 969                        | USB_REQ_CLEAR_FEATURE:
 970                goto stall;
 971
 972        /*
 973         * Hosts may clear bulk/intr endpoint halt after the gadget
 974         * driver sets it (not widely used); or set it (for testing)
 975         */
 976        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
 977                        | USB_REQ_GET_STATUS:
 978                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
 979                ep = &udc->ep[tmp];
 980                if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
 981                        goto stall;
 982
 983                if (tmp) {
 984                        if ((w_index & USB_DIR_IN)) {
 985                                if (!ep->is_in)
 986                                        goto stall;
 987                        } else if (ep->is_in)
 988                                goto stall;
 989                }
 990                PACKET("get %s status\n", ep->ep.name);
 991                if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
 992                        tmp = (1 << USB_ENDPOINT_HALT);
 993                else
 994                        tmp = 0;
 995                __raw_writeb(tmp, dreg);
 996                __raw_writeb(0, dreg);
 997                goto write_in;
 998                /* then STATUS starts later, automatically */
 999        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1000                        | USB_REQ_SET_FEATURE:
1001                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1002                ep = &udc->ep[tmp];
1003                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1004                        goto stall;
1005                if (!ep->ep.desc || ep->is_iso)
1006                        goto stall;
1007                if ((w_index & USB_DIR_IN)) {
1008                        if (!ep->is_in)
1009                                goto stall;
1010                } else if (ep->is_in)
1011                        goto stall;
1012
1013                tmp = __raw_readl(ep->creg);
1014                tmp &= ~SET_FX;
1015                tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1016                __raw_writel(tmp, ep->creg);
1017                goto succeed;
1018        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1019                        | USB_REQ_CLEAR_FEATURE:
1020                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1021                ep = &udc->ep[tmp];
1022                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1023                        goto stall;
1024                if (tmp == 0)
1025                        goto succeed;
1026                if (!ep->ep.desc || ep->is_iso)
1027                        goto stall;
1028                if ((w_index & USB_DIR_IN)) {
1029                        if (!ep->is_in)
1030                                goto stall;
1031                } else if (ep->is_in)
1032                        goto stall;
1033
1034                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1035                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1036                tmp = __raw_readl(ep->creg);
1037                tmp |= CLR_FX;
1038                tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1039                __raw_writel(tmp, ep->creg);
1040                if (!list_empty(&ep->queue))
1041                        handle_ep(ep);
1042                goto succeed;
1043        }
1044
1045#undef w_value
1046#undef w_index
1047#undef w_length
1048
1049        /* pass request up to the gadget driver */
1050        if (udc->driver) {
1051                spin_unlock(&udc->lock);
1052                status = udc->driver->setup(&udc->gadget, &pkt.r);
1053                spin_lock(&udc->lock);
1054        }
1055        else
1056                status = -ENODEV;
1057        if (status < 0) {
1058stall:
1059                VDBG("req %02x.%02x protocol STALL; stat %d\n",
1060                                pkt.r.bRequestType, pkt.r.bRequest, status);
1061                csr |= AT91_UDP_FORCESTALL;
1062                __raw_writel(csr, creg);
1063                udc->req_pending = 0;
1064        }
1065        return;
1066
1067succeed:
1068        /* immediate successful (IN) STATUS after zero length DATA */
1069        PACKET("ep0 in/status\n");
1070write_in:
1071        csr |= AT91_UDP_TXPKTRDY;
1072        __raw_writel(csr, creg);
1073        udc->req_pending = 0;
1074}
1075
1076static void handle_ep0(struct at91_udc *udc)
1077{
1078        struct at91_ep          *ep0 = &udc->ep[0];
1079        u32 __iomem             *creg = ep0->creg;
1080        u32                     csr = __raw_readl(creg);
1081        struct at91_request     *req;
1082
1083        if (unlikely(csr & AT91_UDP_STALLSENT)) {
1084                nuke(ep0, -EPROTO);
1085                udc->req_pending = 0;
1086                csr |= CLR_FX;
1087                csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1088                __raw_writel(csr, creg);
1089                VDBG("ep0 stalled\n");
1090                csr = __raw_readl(creg);
1091        }
1092        if (csr & AT91_UDP_RXSETUP) {
1093                nuke(ep0, 0);
1094                udc->req_pending = 0;
1095                handle_setup(udc, ep0, csr);
1096                return;
1097        }
1098
1099        if (list_empty(&ep0->queue))
1100                req = NULL;
1101        else
1102                req = list_entry(ep0->queue.next, struct at91_request, queue);
1103
1104        /* host ACKed an IN packet that we sent */
1105        if (csr & AT91_UDP_TXCOMP) {
1106                csr |= CLR_FX;
1107                csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1108
1109                /* write more IN DATA? */
1110                if (req && ep0->is_in) {
1111                        if (handle_ep(ep0))
1112                                udc->req_pending = 0;
1113
1114                /*
1115                 * Ack after:
1116                 *  - last IN DATA packet (including GET_STATUS)
1117                 *  - IN/STATUS for OUT DATA
1118                 *  - IN/STATUS for any zero-length DATA stage
1119                 * except for the IN DATA case, the host should send
1120                 * an OUT status later, which we'll ack.
1121                 */
1122                } else {
1123                        udc->req_pending = 0;
1124                        __raw_writel(csr, creg);
1125
1126                        /*
1127                         * SET_ADDRESS takes effect only after the STATUS
1128                         * (to the original address) gets acked.
1129                         */
1130                        if (udc->wait_for_addr_ack) {
1131                                u32     tmp;
1132
1133                                at91_udp_write(udc, AT91_UDP_FADDR,
1134                                                AT91_UDP_FEN | udc->addr);
1135                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1136                                tmp &= ~AT91_UDP_FADDEN;
1137                                if (udc->addr)
1138                                        tmp |= AT91_UDP_FADDEN;
1139                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1140
1141                                udc->wait_for_addr_ack = 0;
1142                                VDBG("address %d\n", udc->addr);
1143                        }
1144                }
1145        }
1146
1147        /* OUT packet arrived ... */
1148        else if (csr & AT91_UDP_RX_DATA_BK0) {
1149                csr |= CLR_FX;
1150                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1151
1152                /* OUT DATA stage */
1153                if (!ep0->is_in) {
1154                        if (req) {
1155                                if (handle_ep(ep0)) {
1156                                        /* send IN/STATUS */
1157                                        PACKET("ep0 in/status\n");
1158                                        csr = __raw_readl(creg);
1159                                        csr &= ~SET_FX;
1160                                        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1161                                        __raw_writel(csr, creg);
1162                                        udc->req_pending = 0;
1163                                }
1164                        } else if (udc->req_pending) {
1165                                /*
1166                                 * AT91 hardware has a hard time with this
1167                                 * "deferred response" mode for control-OUT
1168                                 * transfers.  (For control-IN it's fine.)
1169                                 *
1170                                 * The normal solution leaves OUT data in the
1171                                 * fifo until the gadget driver is ready.
1172                                 * We couldn't do that here without disabling
1173                                 * the IRQ that tells about SETUP packets,
1174                                 * e.g. when the host gets impatient...
1175                                 *
1176                                 * Working around it by copying into a buffer
1177                                 * would almost be a non-deferred response,
1178                                 * except that it wouldn't permit reliable
1179                                 * stalling of the request.  Instead, demand
1180                                 * that gadget drivers not use this mode.
1181                                 */
1182                                DBG("no control-OUT deferred responses!\n");
1183                                __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1184                                udc->req_pending = 0;
1185                        }
1186
1187                /* STATUS stage for control-IN; ack.  */
1188                } else {
1189                        PACKET("ep0 out/status ACK\n");
1190                        __raw_writel(csr, creg);
1191
1192                        /* "early" status stage */
1193                        if (req)
1194                                done(ep0, req, 0);
1195                }
1196        }
1197}
1198
1199static irqreturn_t at91_udc_irq(struct at91_udc *udc)
1200{
1201        u32                     rescans = 5;
1202        int                     disable_clock = 0;
1203        unsigned long           flags;
1204
1205        spin_lock_irqsave(&udc->lock, flags);
1206
1207        if (!udc->clocked) {
1208                clk_on(udc);
1209                disable_clock = 1;
1210        }
1211
1212        while (rescans--) {
1213                u32 status;
1214
1215                status = at91_udp_read(udc, AT91_UDP_ISR)
1216                        & at91_udp_read(udc, AT91_UDP_IMR);
1217                if (!status)
1218                        break;
1219
1220                /* USB reset irq:  not maskable */
1221                if (status & AT91_UDP_ENDBUSRES) {
1222                        at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1223                        at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1224                        /* Atmel code clears this irq twice */
1225                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1226                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1227                        VDBG("end bus reset\n");
1228                        udc->addr = 0;
1229                        reset_gadget(udc);
1230
1231                        /* enable ep0 */
1232                        at91_udp_write(udc, AT91_UDP_CSR(0),
1233                                        AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1234                        udc->gadget.speed = USB_SPEED_FULL;
1235                        udc->suspended = 0;
1236                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1237
1238                        /*
1239                         * NOTE:  this driver keeps clocks off unless the
1240                         * USB host is present.  That saves power, but for
1241                         * boards that don't support VBUS detection, both
1242                         * clocks need to be active most of the time.
1243                         */
1244
1245                /* host initiated suspend (3+ms bus idle) */
1246                } else if (status & AT91_UDP_RXSUSP) {
1247                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1248                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1249                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1250                        /* VDBG("bus suspend\n"); */
1251                        if (udc->suspended)
1252                                continue;
1253                        udc->suspended = 1;
1254
1255                        /*
1256                         * NOTE:  when suspending a VBUS-powered device, the
1257                         * gadget driver should switch into slow clock mode
1258                         * and then into standby to avoid drawing more than
1259                         * 500uA power (2500uA for some high-power configs).
1260                         */
1261                        if (udc->driver && udc->driver->suspend) {
1262                                spin_unlock(&udc->lock);
1263                                udc->driver->suspend(&udc->gadget);
1264                                spin_lock(&udc->lock);
1265                        }
1266
1267                /* host initiated resume */
1268                } else if (status & AT91_UDP_RXRSM) {
1269                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1270                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1271                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1272                        /* VDBG("bus resume\n"); */
1273                        if (!udc->suspended)
1274                                continue;
1275                        udc->suspended = 0;
1276
1277                        /*
1278                         * NOTE:  for a VBUS-powered device, the gadget driver
1279                         * would normally want to switch out of slow clock
1280                         * mode into normal mode.
1281                         */
1282                        if (udc->driver && udc->driver->resume) {
1283                                spin_unlock(&udc->lock);
1284                                udc->driver->resume(&udc->gadget);
1285                                spin_lock(&udc->lock);
1286                        }
1287
1288                /* endpoint IRQs are cleared by handling them */
1289                } else {
1290                        int             i;
1291                        unsigned        mask = 1;
1292                        struct at91_ep  *ep = &udc->ep[1];
1293
1294                        if (status & mask)
1295                                handle_ep0(udc);
1296                        for (i = 1; i < NUM_ENDPOINTS; i++) {
1297                                mask <<= 1;
1298                                if (status & mask)
1299                                        handle_ep(ep);
1300                                ep++;
1301                        }
1302                }
1303        }
1304
1305        if (disable_clock)
1306                clk_off(udc);
1307
1308        spin_unlock_irqrestore(&udc->lock, flags);
1309
1310        return IRQ_HANDLED;
1311}
1312
1313/*-------------------------------------------------------------------------*/
1314
1315static int at91_start(struct usb_gadget *gadget,
1316                struct usb_gadget_driver *driver)
1317{
1318        struct at91_udc *udc = controller;
1319
1320        udc->driver = driver;
1321        udc->enabled = 1;
1322        udc->selfpowered = 1;
1323
1324        return 0;
1325}
1326
1327static int at91_stop(struct usb_gadget *gadget)
1328{
1329        struct at91_udc *udc = controller;
1330        unsigned long   flags;
1331
1332        spin_lock_irqsave(&udc->lock, flags);
1333        udc->enabled = 0;
1334        at91_udp_write(udc, AT91_UDP_IDR, ~0);
1335        spin_unlock_irqrestore(&udc->lock, flags);
1336
1337        udc->driver = NULL;
1338
1339        return 0;
1340}
1341
1342/*-------------------------------------------------------------------------*/
1343
1344#if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20)
1345static int at91sam9260_udc_init(struct at91_udc *udc)
1346{
1347        struct at91_ep *ep;
1348        int i;
1349
1350        for (i = 0; i < NUM_ENDPOINTS; i++) {
1351                ep = &udc->ep[i];
1352
1353                switch (i) {
1354                case 0 ... 3:
1355                        ep->maxpacket = 64;
1356                        break;
1357                case 4 ... 5:
1358                        ep->maxpacket = 512;
1359                        break;
1360                }
1361        }
1362
1363        return 0;
1364}
1365
1366static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1367{
1368        u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1369
1370        if (is_on)
1371                txvc |= AT91_UDP_TXVC_PUON;
1372        else
1373                txvc &= ~AT91_UDP_TXVC_PUON;
1374
1375        at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1376}
1377
1378static const struct at91_udc_caps at91sam9260_udc_caps = {
1379        .init = at91sam9260_udc_init,
1380        .pullup = at91sam9260_udc_pullup,
1381};
1382#endif
1383
1384#if defined(CONFIG_AT91SAM9261)
1385static int at91sam9261_udc_init(struct at91_udc *udc)
1386{
1387        struct at91_ep *ep;
1388        int i;
1389
1390        for (i = 0; i < NUM_ENDPOINTS; i++) {
1391                ep = &udc->ep[i];
1392
1393                switch (i) {
1394                case 0:
1395                        ep->maxpacket = 8;
1396                        break;
1397                case 1 ... 3:
1398                        ep->maxpacket = 64;
1399                        break;
1400                case 4 ... 5:
1401                        ep->maxpacket = 256;
1402                        break;
1403                }
1404        }
1405
1406        udc->matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX;
1407
1408        if (IS_ERR(udc->matrix))
1409                return PTR_ERR(udc->matrix);
1410
1411        return 0;
1412}
1413
1414static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1415{
1416        u32 usbpucr = 0;
1417
1418        usbpucr = readl(&udc->matrix->pucr);
1419        if (is_on)
1420                usbpucr |= AT91_MATRIX_USBPUCR_PUON;
1421
1422        writel(usbpucr, &udc->matrix->pucr);
1423}
1424
1425static const struct at91_udc_caps at91sam9261_udc_caps = {
1426        .init = at91sam9261_udc_init,
1427        .pullup = at91sam9261_udc_pullup,
1428};
1429#endif
1430
1431int usb_gadget_handle_interrupts(int index)
1432{
1433        struct at91_udc *udc = controller;
1434
1435        return at91_udc_irq(udc);
1436}
1437
1438int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1439{
1440        struct at91_udc *udc = controller;
1441        int ret;
1442
1443        if (!driver || !driver->bind || !driver->setup) {
1444                printf("bad paramter\n");
1445                return -EINVAL;
1446        }
1447
1448        if (udc->driver) {
1449                printf("UDC already has a gadget driver\n");
1450                return -EBUSY;
1451        }
1452
1453        at91_start(&udc->gadget, driver);
1454
1455        udc->driver = driver;
1456
1457        ret = driver->bind(&udc->gadget);
1458        if (ret) {
1459                pr_err("driver->bind() returned %d\n", ret);
1460                udc->driver = NULL;
1461        }
1462
1463        return ret;
1464}
1465
1466int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1467{
1468        struct at91_udc *udc = controller;
1469
1470        if (!driver || !driver->unbind || !driver->disconnect) {
1471                pr_err("bad paramter\n");
1472                return -EINVAL;
1473        }
1474
1475        driver->disconnect(&udc->gadget);
1476        driver->unbind(&udc->gadget);
1477        udc->driver = NULL;
1478
1479        at91_stop(&udc->gadget);
1480
1481        return 0;
1482}
1483
1484int at91_udc_probe(struct at91_udc_data *pdata)
1485{
1486        struct at91_udc *udc;
1487        int             retval;
1488        struct at91_ep  *ep;
1489        int             i;
1490
1491        udc = kzalloc(sizeof(*udc), GFP_KERNEL);
1492        if (!udc)
1493                return -ENOMEM;
1494
1495        controller = udc;
1496        memcpy(&udc->board, pdata, sizeof(struct at91_udc_data));
1497        if (udc->board.vbus_pin) {
1498                printf("%s: gpio vbus pin not supported yet.\n", __func__);
1499                return -ENXIO;
1500        } else {
1501                DBG("no VBUS detection, assuming always-on\n");
1502                udc->vbus = 1;
1503        }
1504
1505#if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20)
1506        udc->caps = &at91sam9260_udc_caps;
1507#endif
1508
1509        udc->enabled = 0;
1510        spin_lock_init(&udc->lock);
1511
1512        udc->gadget.ops = &at91_udc_ops;
1513        udc->gadget.ep0 = &udc->ep[0].ep;
1514        udc->gadget.name = driver_name;
1515
1516        for (i = 0; i < NUM_ENDPOINTS; i++) {
1517                ep = &udc->ep[i];
1518                ep->ep.name = ep_names[i];
1519                ep->ep.ops = &at91_ep_ops;
1520                ep->udc = udc;
1521                ep->int_mask = (1 << i);
1522                if (i != 0 && i != 3)
1523                        ep->is_pingpong = 1;
1524        }
1525
1526        udc->udp_baseaddr = (void *)udc->board.baseaddr;
1527        if (IS_ERR(udc->udp_baseaddr))
1528                return PTR_ERR(udc->udp_baseaddr);
1529
1530        if (udc->caps && udc->caps->init) {
1531                retval = udc->caps->init(udc);
1532                if (retval)
1533                        return retval;
1534        }
1535
1536        udc_reinit(udc);
1537
1538        at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1539        at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1540        /* Clear all pending interrupts - UDP may be used by bootloader. */
1541        at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1542
1543        INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1544        return 0;
1545}
1546