linux/drivers/usb/gadget/udc/at91_udc.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * at91_udc -- driver for at91-series USB peripheral controller
   4 *
   5 * Copyright (C) 2004 by Thomas Rathbone
   6 * Copyright (C) 2005 by HP Labs
   7 * Copyright (C) 2005 by David Brownell
   8 */
   9
  10#undef  VERBOSE_DEBUG
  11#undef  PACKET_TRACE
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16#include <linux/delay.h>
  17#include <linux/ioport.h>
  18#include <linux/slab.h>
  19#include <linux/errno.h>
  20#include <linux/list.h>
  21#include <linux/interrupt.h>
  22#include <linux/proc_fs.h>
  23#include <linux/prefetch.h>
  24#include <linux/clk.h>
  25#include <linux/usb/ch9.h>
  26#include <linux/usb/gadget.h>
  27#include <linux/of.h>
  28#include <linux/of_gpio.h>
  29#include <linux/platform_data/atmel.h>
  30#include <linux/regmap.h>
  31#include <linux/mfd/syscon.h>
  32#include <linux/mfd/syscon/atmel-matrix.h>
  33
  34#include "at91_udc.h"
  35
  36
  37/*
  38 * This controller is simple and PIO-only.  It's used in many AT91-series
  39 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
  40 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
  41 *
  42 * This driver expects the board has been wired with two GPIOs supporting
  43 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
  44 * testing hasn't covered such cases.)
  45 *
  46 * The pullup is most important (so it's integrated on sam926x parts).  It
  47 * provides software control over whether the host enumerates the device.
  48 *
  49 * The VBUS sensing helps during enumeration, and allows both USB clocks
  50 * (and the transceiver) to stay gated off until they're necessary, saving
  51 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
  52 * it may also be gated off by software during some Linux sleep states.
  53 */
  54
  55#define DRIVER_VERSION  "3 May 2006"
  56
  57static const char driver_name [] = "at91_udc";
  58
  59static const struct {
  60        const char *name;
  61        const struct usb_ep_caps caps;
  62} ep_info[] = {
  63#define EP_INFO(_name, _caps) \
  64        { \
  65                .name = _name, \
  66                .caps = _caps, \
  67        }
  68
  69        EP_INFO("ep0",
  70                USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  71        EP_INFO("ep1",
  72                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  73        EP_INFO("ep2",
  74                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  75        EP_INFO("ep3-int",
  76                USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)),
  77        EP_INFO("ep4",
  78                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  79        EP_INFO("ep5",
  80                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  81
  82#undef EP_INFO
  83};
  84
  85#define ep0name         ep_info[0].name
  86
  87#define VBUS_POLL_TIMEOUT       msecs_to_jiffies(1000)
  88
  89#define at91_udp_read(udc, reg) \
  90        __raw_readl((udc)->udp_baseaddr + (reg))
  91#define at91_udp_write(udc, reg, val) \
  92        __raw_writel((val), (udc)->udp_baseaddr + (reg))
  93
  94/*-------------------------------------------------------------------------*/
  95
  96#ifdef CONFIG_USB_GADGET_DEBUG_FILES
  97
  98#include <linux/seq_file.h>
  99
 100static const char debug_filename[] = "driver/udc";
 101
 102#define FOURBITS "%s%s%s%s"
 103#define EIGHTBITS FOURBITS FOURBITS
 104
 105static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
 106{
 107        static char             *types[] = {
 108                "control", "out-iso", "out-bulk", "out-int",
 109                "BOGUS",   "in-iso",  "in-bulk",  "in-int"};
 110
 111        u32                     csr;
 112        struct at91_request     *req;
 113        unsigned long   flags;
 114        struct at91_udc *udc = ep->udc;
 115
 116        spin_lock_irqsave(&udc->lock, flags);
 117
 118        csr = __raw_readl(ep->creg);
 119
 120        /* NOTE:  not collecting per-endpoint irq statistics... */
 121
 122        seq_printf(s, "\n");
 123        seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
 124                        ep->ep.name, ep->ep.maxpacket,
 125                        ep->is_in ? "in" : "out",
 126                        ep->is_iso ? " iso" : "",
 127                        ep->is_pingpong
 128                                ? (ep->fifo_bank ? "pong" : "ping")
 129                                : "",
 130                        ep->stopped ? " stopped" : "");
 131        seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
 132                csr,
 133                (csr & 0x07ff0000) >> 16,
 134                (csr & (1 << 15)) ? "enabled" : "disabled",
 135                (csr & (1 << 11)) ? "DATA1" : "DATA0",
 136                types[(csr & 0x700) >> 8],
 137
 138                /* iff type is control then print current direction */
 139                (!(csr & 0x700))
 140                        ? ((csr & (1 << 7)) ? " IN" : " OUT")
 141                        : "",
 142                (csr & (1 << 6)) ? " rxdatabk1" : "",
 143                (csr & (1 << 5)) ? " forcestall" : "",
 144                (csr & (1 << 4)) ? " txpktrdy" : "",
 145
 146                (csr & (1 << 3)) ? " stallsent" : "",
 147                (csr & (1 << 2)) ? " rxsetup" : "",
 148                (csr & (1 << 1)) ? " rxdatabk0" : "",
 149                (csr & (1 << 0)) ? " txcomp" : "");
 150        if (list_empty (&ep->queue))
 151                seq_printf(s, "\t(queue empty)\n");
 152
 153        else list_for_each_entry (req, &ep->queue, queue) {
 154                unsigned        length = req->req.actual;
 155
 156                seq_printf(s, "\treq %p len %d/%d buf %p\n",
 157                                &req->req, length,
 158                                req->req.length, req->req.buf);
 159        }
 160        spin_unlock_irqrestore(&udc->lock, flags);
 161}
 162
 163static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
 164{
 165        int i;
 166
 167        seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
 168                (mask & (1 << 13)) ? " wakeup" : "",
 169                (mask & (1 << 12)) ? " endbusres" : "",
 170
 171                (mask & (1 << 11)) ? " sofint" : "",
 172                (mask & (1 << 10)) ? " extrsm" : "",
 173                (mask & (1 << 9)) ? " rxrsm" : "",
 174                (mask & (1 << 8)) ? " rxsusp" : "");
 175        for (i = 0; i < 8; i++) {
 176                if (mask & (1 << i))
 177                        seq_printf(s, " ep%d", i);
 178        }
 179        seq_printf(s, "\n");
 180}
 181
 182static int proc_udc_show(struct seq_file *s, void *unused)
 183{
 184        struct at91_udc *udc = s->private;
 185        struct at91_ep  *ep;
 186        u32             tmp;
 187
 188        seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
 189
 190        seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
 191                udc->vbus ? "present" : "off",
 192                udc->enabled
 193                        ? (udc->vbus ? "active" : "enabled")
 194                        : "disabled",
 195                udc->gadget.is_selfpowered ? "self" : "VBUS",
 196                udc->suspended ? ", suspended" : "",
 197                udc->driver ? udc->driver->driver.name : "(none)");
 198
 199        /* don't access registers when interface isn't clocked */
 200        if (!udc->clocked) {
 201                seq_printf(s, "(not clocked)\n");
 202                return 0;
 203        }
 204
 205        tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
 206        seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
 207                (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
 208                (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
 209                (tmp & AT91_UDP_NUM));
 210
 211        tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 212        seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
 213                (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
 214                (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
 215                (tmp & AT91_UDP_ESR) ? " esr" : "",
 216                (tmp & AT91_UDP_CONFG) ? " confg" : "",
 217                (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
 218
 219        tmp = at91_udp_read(udc, AT91_UDP_FADDR);
 220        seq_printf(s, "faddr   %03x:%s fadd=%d\n", tmp,
 221                (tmp & AT91_UDP_FEN) ? " fen" : "",
 222                (tmp & AT91_UDP_FADD));
 223
 224        proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
 225        proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
 226
 227        if (udc->enabled && udc->vbus) {
 228                proc_ep_show(s, &udc->ep[0]);
 229                list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
 230                        if (ep->ep.desc)
 231                                proc_ep_show(s, ep);
 232                }
 233        }
 234        return 0;
 235}
 236
 237static void create_debug_file(struct at91_udc *udc)
 238{
 239        udc->pde = proc_create_single_data(debug_filename, 0, NULL,
 240                        proc_udc_show, udc);
 241}
 242
 243static void remove_debug_file(struct at91_udc *udc)
 244{
 245        if (udc->pde)
 246                remove_proc_entry(debug_filename, NULL);
 247}
 248
 249#else
 250
 251static inline void create_debug_file(struct at91_udc *udc) {}
 252static inline void remove_debug_file(struct at91_udc *udc) {}
 253
 254#endif
 255
 256
 257/*-------------------------------------------------------------------------*/
 258
 259static void done(struct at91_ep *ep, struct at91_request *req, int status)
 260{
 261        unsigned        stopped = ep->stopped;
 262        struct at91_udc *udc = ep->udc;
 263
 264        list_del_init(&req->queue);
 265        if (req->req.status == -EINPROGRESS)
 266                req->req.status = status;
 267        else
 268                status = req->req.status;
 269        if (status && status != -ESHUTDOWN)
 270                VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
 271
 272        ep->stopped = 1;
 273        spin_unlock(&udc->lock);
 274        usb_gadget_giveback_request(&ep->ep, &req->req);
 275        spin_lock(&udc->lock);
 276        ep->stopped = stopped;
 277
 278        /* ep0 is always ready; other endpoints need a non-empty queue */
 279        if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
 280                at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
 281}
 282
 283/*-------------------------------------------------------------------------*/
 284
 285/* bits indicating OUT fifo has data ready */
 286#define RX_DATA_READY   (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
 287
 288/*
 289 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 290 * back most of the value you just read (because of side effects, including
 291 * bits that may change after reading and before writing).
 292 *
 293 * Except when changing a specific bit, always write values which:
 294 *  - clear SET_FX bits (setting them could change something)
 295 *  - set CLR_FX bits (clearing them could change something)
 296 *
 297 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 298 * that shouldn't normally be changed.
 299 *
 300 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 301 * implying a need to wait for one write to complete (test relevant bits)
 302 * before starting the next write.  This shouldn't be an issue given how
 303 * infrequently we write, except maybe for write-then-read idioms.
 304 */
 305#define SET_FX  (AT91_UDP_TXPKTRDY)
 306#define CLR_FX  (RX_DATA_READY | AT91_UDP_RXSETUP \
 307                | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
 308
 309/* pull OUT packet data from the endpoint's fifo */
 310static int read_fifo (struct at91_ep *ep, struct at91_request *req)
 311{
 312        u32 __iomem     *creg = ep->creg;
 313        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 314        u32             csr;
 315        u8              *buf;
 316        unsigned int    count, bufferspace, is_done;
 317
 318        buf = req->req.buf + req->req.actual;
 319        bufferspace = req->req.length - req->req.actual;
 320
 321        /*
 322         * there might be nothing to read if ep_queue() calls us,
 323         * or if we already emptied both pingpong buffers
 324         */
 325rescan:
 326        csr = __raw_readl(creg);
 327        if ((csr & RX_DATA_READY) == 0)
 328                return 0;
 329
 330        count = (csr & AT91_UDP_RXBYTECNT) >> 16;
 331        if (count > ep->ep.maxpacket)
 332                count = ep->ep.maxpacket;
 333        if (count > bufferspace) {
 334                DBG("%s buffer overflow\n", ep->ep.name);
 335                req->req.status = -EOVERFLOW;
 336                count = bufferspace;
 337        }
 338        __raw_readsb(dreg, buf, count);
 339
 340        /* release and swap pingpong mem bank */
 341        csr |= CLR_FX;
 342        if (ep->is_pingpong) {
 343                if (ep->fifo_bank == 0) {
 344                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 345                        ep->fifo_bank = 1;
 346                } else {
 347                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
 348                        ep->fifo_bank = 0;
 349                }
 350        } else
 351                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 352        __raw_writel(csr, creg);
 353
 354        req->req.actual += count;
 355        is_done = (count < ep->ep.maxpacket);
 356        if (count == bufferspace)
 357                is_done = 1;
 358
 359        PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
 360                        is_done ? " (done)" : "");
 361
 362        /*
 363         * avoid extra trips through IRQ logic for packets already in
 364         * the fifo ... maybe preventing an extra (expensive) OUT-NAK
 365         */
 366        if (is_done)
 367                done(ep, req, 0);
 368        else if (ep->is_pingpong) {
 369                /*
 370                 * One dummy read to delay the code because of a HW glitch:
 371                 * CSR returns bad RXCOUNT when read too soon after updating
 372                 * RX_DATA_BK flags.
 373                 */
 374                csr = __raw_readl(creg);
 375
 376                bufferspace -= count;
 377                buf += count;
 378                goto rescan;
 379        }
 380
 381        return is_done;
 382}
 383
 384/* load fifo for an IN packet */
 385static int write_fifo(struct at91_ep *ep, struct at91_request *req)
 386{
 387        u32 __iomem     *creg = ep->creg;
 388        u32             csr = __raw_readl(creg);
 389        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 390        unsigned        total, count, is_last;
 391        u8              *buf;
 392
 393        /*
 394         * TODO: allow for writing two packets to the fifo ... that'll
 395         * reduce the amount of IN-NAKing, but probably won't affect
 396         * throughput much.  (Unlike preventing OUT-NAKing!)
 397         */
 398
 399        /*
 400         * If ep_queue() calls us, the queue is empty and possibly in
 401         * odd states like TXCOMP not yet cleared (we do it, saving at
 402         * least one IRQ) or the fifo not yet being free.  Those aren't
 403         * issues normally (IRQ handler fast path).
 404         */
 405        if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
 406                if (csr & AT91_UDP_TXCOMP) {
 407                        csr |= CLR_FX;
 408                        csr &= ~(SET_FX | AT91_UDP_TXCOMP);
 409                        __raw_writel(csr, creg);
 410                        csr = __raw_readl(creg);
 411                }
 412                if (csr & AT91_UDP_TXPKTRDY)
 413                        return 0;
 414        }
 415
 416        buf = req->req.buf + req->req.actual;
 417        prefetch(buf);
 418        total = req->req.length - req->req.actual;
 419        if (ep->ep.maxpacket < total) {
 420                count = ep->ep.maxpacket;
 421                is_last = 0;
 422        } else {
 423                count = total;
 424                is_last = (count < ep->ep.maxpacket) || !req->req.zero;
 425        }
 426
 427        /*
 428         * Write the packet, maybe it's a ZLP.
 429         *
 430         * NOTE:  incrementing req->actual before we receive the ACK means
 431         * gadget driver IN bytecounts can be wrong in fault cases.  That's
 432         * fixable with PIO drivers like this one (save "count" here, and
 433         * do the increment later on TX irq), but not for most DMA hardware.
 434         *
 435         * So all gadget drivers must accept that potential error.  Some
 436         * hardware supports precise fifo status reporting, letting them
 437         * recover when the actual bytecount matters (e.g. for USB Test
 438         * and Measurement Class devices).
 439         */
 440        __raw_writesb(dreg, buf, count);
 441        csr &= ~SET_FX;
 442        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
 443        __raw_writel(csr, creg);
 444        req->req.actual += count;
 445
 446        PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
 447                        is_last ? " (done)" : "");
 448        if (is_last)
 449                done(ep, req, 0);
 450        return is_last;
 451}
 452
 453static void nuke(struct at91_ep *ep, int status)
 454{
 455        struct at91_request *req;
 456
 457        /* terminate any request in the queue */
 458        ep->stopped = 1;
 459        if (list_empty(&ep->queue))
 460                return;
 461
 462        VDBG("%s %s\n", __func__, ep->ep.name);
 463        while (!list_empty(&ep->queue)) {
 464                req = list_entry(ep->queue.next, struct at91_request, queue);
 465                done(ep, req, status);
 466        }
 467}
 468
 469/*-------------------------------------------------------------------------*/
 470
 471static int at91_ep_enable(struct usb_ep *_ep,
 472                                const struct usb_endpoint_descriptor *desc)
 473{
 474        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 475        struct at91_udc *udc;
 476        u16             maxpacket;
 477        u32             tmp;
 478        unsigned long   flags;
 479
 480        if (!_ep || !ep
 481                        || !desc || _ep->name == ep0name
 482                        || desc->bDescriptorType != USB_DT_ENDPOINT
 483                        || (maxpacket = usb_endpoint_maxp(desc)) == 0
 484                        || maxpacket > ep->maxpacket) {
 485                DBG("bad ep or descriptor\n");
 486                return -EINVAL;
 487        }
 488
 489        udc = ep->udc;
 490        if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 491                DBG("bogus device state\n");
 492                return -ESHUTDOWN;
 493        }
 494
 495        tmp = usb_endpoint_type(desc);
 496        switch (tmp) {
 497        case USB_ENDPOINT_XFER_CONTROL:
 498                DBG("only one control endpoint\n");
 499                return -EINVAL;
 500        case USB_ENDPOINT_XFER_INT:
 501                if (maxpacket > 64)
 502                        goto bogus_max;
 503                break;
 504        case USB_ENDPOINT_XFER_BULK:
 505                switch (maxpacket) {
 506                case 8:
 507                case 16:
 508                case 32:
 509                case 64:
 510                        goto ok;
 511                }
 512bogus_max:
 513                DBG("bogus maxpacket %d\n", maxpacket);
 514                return -EINVAL;
 515        case USB_ENDPOINT_XFER_ISOC:
 516                if (!ep->is_pingpong) {
 517                        DBG("iso requires double buffering\n");
 518                        return -EINVAL;
 519                }
 520                break;
 521        }
 522
 523ok:
 524        spin_lock_irqsave(&udc->lock, flags);
 525
 526        /* initialize endpoint to match this descriptor */
 527        ep->is_in = usb_endpoint_dir_in(desc);
 528        ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
 529        ep->stopped = 0;
 530        if (ep->is_in)
 531                tmp |= 0x04;
 532        tmp <<= 8;
 533        tmp |= AT91_UDP_EPEDS;
 534        __raw_writel(tmp, ep->creg);
 535
 536        ep->ep.maxpacket = maxpacket;
 537
 538        /*
 539         * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
 540         * since endpoint resets don't reset hw pingpong state.
 541         */
 542        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 543        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 544
 545        spin_unlock_irqrestore(&udc->lock, flags);
 546        return 0;
 547}
 548
 549static int at91_ep_disable (struct usb_ep * _ep)
 550{
 551        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 552        struct at91_udc *udc = ep->udc;
 553        unsigned long   flags;
 554
 555        if (ep == &ep->udc->ep[0])
 556                return -EINVAL;
 557
 558        spin_lock_irqsave(&udc->lock, flags);
 559
 560        nuke(ep, -ESHUTDOWN);
 561
 562        /* restore the endpoint's pristine config */
 563        ep->ep.desc = NULL;
 564        ep->ep.maxpacket = ep->maxpacket;
 565
 566        /* reset fifos and endpoint */
 567        if (ep->udc->clocked) {
 568                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 569                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 570                __raw_writel(0, ep->creg);
 571        }
 572
 573        spin_unlock_irqrestore(&udc->lock, flags);
 574        return 0;
 575}
 576
 577/*
 578 * this is a PIO-only driver, so there's nothing
 579 * interesting for request or buffer allocation.
 580 */
 581
 582static struct usb_request *
 583at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 584{
 585        struct at91_request *req;
 586
 587        req = kzalloc(sizeof (struct at91_request), gfp_flags);
 588        if (!req)
 589                return NULL;
 590
 591        INIT_LIST_HEAD(&req->queue);
 592        return &req->req;
 593}
 594
 595static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 596{
 597        struct at91_request *req;
 598
 599        req = container_of(_req, struct at91_request, req);
 600        BUG_ON(!list_empty(&req->queue));
 601        kfree(req);
 602}
 603
 604static int at91_ep_queue(struct usb_ep *_ep,
 605                        struct usb_request *_req, gfp_t gfp_flags)
 606{
 607        struct at91_request     *req;
 608        struct at91_ep          *ep;
 609        struct at91_udc         *udc;
 610        int                     status;
 611        unsigned long           flags;
 612
 613        req = container_of(_req, struct at91_request, req);
 614        ep = container_of(_ep, struct at91_ep, ep);
 615
 616        if (!_req || !_req->complete
 617                        || !_req->buf || !list_empty(&req->queue)) {
 618                DBG("invalid request\n");
 619                return -EINVAL;
 620        }
 621
 622        if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
 623                DBG("invalid ep\n");
 624                return -EINVAL;
 625        }
 626
 627        udc = ep->udc;
 628
 629        if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 630                DBG("invalid device\n");
 631                return -EINVAL;
 632        }
 633
 634        _req->status = -EINPROGRESS;
 635        _req->actual = 0;
 636
 637        spin_lock_irqsave(&udc->lock, flags);
 638
 639        /* try to kickstart any empty and idle queue */
 640        if (list_empty(&ep->queue) && !ep->stopped) {
 641                int     is_ep0;
 642
 643                /*
 644                 * If this control request has a non-empty DATA stage, this
 645                 * will start that stage.  It works just like a non-control
 646                 * request (until the status stage starts, maybe early).
 647                 *
 648                 * If the data stage is empty, then this starts a successful
 649                 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
 650                 */
 651                is_ep0 = (ep->ep.name == ep0name);
 652                if (is_ep0) {
 653                        u32     tmp;
 654
 655                        if (!udc->req_pending) {
 656                                status = -EINVAL;
 657                                goto done;
 658                        }
 659
 660                        /*
 661                         * defer changing CONFG until after the gadget driver
 662                         * reconfigures the endpoints.
 663                         */
 664                        if (udc->wait_for_config_ack) {
 665                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 666                                tmp ^= AT91_UDP_CONFG;
 667                                VDBG("toggle config\n");
 668                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 669                        }
 670                        if (req->req.length == 0) {
 671ep0_in_status:
 672                                PACKET("ep0 in/status\n");
 673                                status = 0;
 674                                tmp = __raw_readl(ep->creg);
 675                                tmp &= ~SET_FX;
 676                                tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
 677                                __raw_writel(tmp, ep->creg);
 678                                udc->req_pending = 0;
 679                                goto done;
 680                        }
 681                }
 682
 683                if (ep->is_in)
 684                        status = write_fifo(ep, req);
 685                else {
 686                        status = read_fifo(ep, req);
 687
 688                        /* IN/STATUS stage is otherwise triggered by irq */
 689                        if (status && is_ep0)
 690                                goto ep0_in_status;
 691                }
 692        } else
 693                status = 0;
 694
 695        if (req && !status) {
 696                list_add_tail (&req->queue, &ep->queue);
 697                at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
 698        }
 699done:
 700        spin_unlock_irqrestore(&udc->lock, flags);
 701        return (status < 0) ? status : 0;
 702}
 703
 704static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 705{
 706        struct at91_ep          *ep;
 707        struct at91_request     *req;
 708        unsigned long           flags;
 709        struct at91_udc         *udc;
 710
 711        ep = container_of(_ep, struct at91_ep, ep);
 712        if (!_ep || ep->ep.name == ep0name)
 713                return -EINVAL;
 714
 715        udc = ep->udc;
 716
 717        spin_lock_irqsave(&udc->lock, flags);
 718
 719        /* make sure it's actually queued on this endpoint */
 720        list_for_each_entry (req, &ep->queue, queue) {
 721                if (&req->req == _req)
 722                        break;
 723        }
 724        if (&req->req != _req) {
 725                spin_unlock_irqrestore(&udc->lock, flags);
 726                return -EINVAL;
 727        }
 728
 729        done(ep, req, -ECONNRESET);
 730        spin_unlock_irqrestore(&udc->lock, flags);
 731        return 0;
 732}
 733
 734static int at91_ep_set_halt(struct usb_ep *_ep, int value)
 735{
 736        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 737        struct at91_udc *udc = ep->udc;
 738        u32 __iomem     *creg;
 739        u32             csr;
 740        unsigned long   flags;
 741        int             status = 0;
 742
 743        if (!_ep || ep->is_iso || !ep->udc->clocked)
 744                return -EINVAL;
 745
 746        creg = ep->creg;
 747        spin_lock_irqsave(&udc->lock, flags);
 748
 749        csr = __raw_readl(creg);
 750
 751        /*
 752         * fail with still-busy IN endpoints, ensuring correct sequencing
 753         * of data tx then stall.  note that the fifo rx bytecount isn't
 754         * completely accurate as a tx bytecount.
 755         */
 756        if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
 757                status = -EAGAIN;
 758        else {
 759                csr |= CLR_FX;
 760                csr &= ~SET_FX;
 761                if (value) {
 762                        csr |= AT91_UDP_FORCESTALL;
 763                        VDBG("halt %s\n", ep->ep.name);
 764                } else {
 765                        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 766                        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 767                        csr &= ~AT91_UDP_FORCESTALL;
 768                }
 769                __raw_writel(csr, creg);
 770        }
 771
 772        spin_unlock_irqrestore(&udc->lock, flags);
 773        return status;
 774}
 775
 776static const struct usb_ep_ops at91_ep_ops = {
 777        .enable         = at91_ep_enable,
 778        .disable        = at91_ep_disable,
 779        .alloc_request  = at91_ep_alloc_request,
 780        .free_request   = at91_ep_free_request,
 781        .queue          = at91_ep_queue,
 782        .dequeue        = at91_ep_dequeue,
 783        .set_halt       = at91_ep_set_halt,
 784        /* there's only imprecise fifo status reporting */
 785};
 786
 787/*-------------------------------------------------------------------------*/
 788
 789static int at91_get_frame(struct usb_gadget *gadget)
 790{
 791        struct at91_udc *udc = to_udc(gadget);
 792
 793        if (!to_udc(gadget)->clocked)
 794                return -EINVAL;
 795        return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
 796}
 797
 798static int at91_wakeup(struct usb_gadget *gadget)
 799{
 800        struct at91_udc *udc = to_udc(gadget);
 801        u32             glbstate;
 802        unsigned long   flags;
 803
 804        DBG("%s\n", __func__ );
 805        spin_lock_irqsave(&udc->lock, flags);
 806
 807        if (!udc->clocked || !udc->suspended)
 808                goto done;
 809
 810        /* NOTE:  some "early versions" handle ESR differently ... */
 811
 812        glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 813        if (!(glbstate & AT91_UDP_ESR))
 814                goto done;
 815        glbstate |= AT91_UDP_ESR;
 816        at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
 817
 818done:
 819        spin_unlock_irqrestore(&udc->lock, flags);
 820        return 0;
 821}
 822
 823/* reinit == restore initial software state */
 824static void udc_reinit(struct at91_udc *udc)
 825{
 826        u32 i;
 827
 828        INIT_LIST_HEAD(&udc->gadget.ep_list);
 829        INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
 830        udc->gadget.quirk_stall_not_supp = 1;
 831
 832        for (i = 0; i < NUM_ENDPOINTS; i++) {
 833                struct at91_ep *ep = &udc->ep[i];
 834
 835                if (i != 0)
 836                        list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 837                ep->ep.desc = NULL;
 838                ep->stopped = 0;
 839                ep->fifo_bank = 0;
 840                usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
 841                ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
 842                /* initialize one queue per endpoint */
 843                INIT_LIST_HEAD(&ep->queue);
 844        }
 845}
 846
 847static void reset_gadget(struct at91_udc *udc)
 848{
 849        struct usb_gadget_driver *driver = udc->driver;
 850        int i;
 851
 852        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 853                driver = NULL;
 854        udc->gadget.speed = USB_SPEED_UNKNOWN;
 855        udc->suspended = 0;
 856
 857        for (i = 0; i < NUM_ENDPOINTS; i++) {
 858                struct at91_ep *ep = &udc->ep[i];
 859
 860                ep->stopped = 1;
 861                nuke(ep, -ESHUTDOWN);
 862        }
 863        if (driver) {
 864                spin_unlock(&udc->lock);
 865                usb_gadget_udc_reset(&udc->gadget, driver);
 866                spin_lock(&udc->lock);
 867        }
 868
 869        udc_reinit(udc);
 870}
 871
 872static void stop_activity(struct at91_udc *udc)
 873{
 874        struct usb_gadget_driver *driver = udc->driver;
 875        int i;
 876
 877        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 878                driver = NULL;
 879        udc->gadget.speed = USB_SPEED_UNKNOWN;
 880        udc->suspended = 0;
 881
 882        for (i = 0; i < NUM_ENDPOINTS; i++) {
 883                struct at91_ep *ep = &udc->ep[i];
 884                ep->stopped = 1;
 885                nuke(ep, -ESHUTDOWN);
 886        }
 887        if (driver) {
 888                spin_unlock(&udc->lock);
 889                driver->disconnect(&udc->gadget);
 890                spin_lock(&udc->lock);
 891        }
 892
 893        udc_reinit(udc);
 894}
 895
 896static void clk_on(struct at91_udc *udc)
 897{
 898        if (udc->clocked)
 899                return;
 900        udc->clocked = 1;
 901
 902        clk_enable(udc->iclk);
 903        clk_enable(udc->fclk);
 904}
 905
 906static void clk_off(struct at91_udc *udc)
 907{
 908        if (!udc->clocked)
 909                return;
 910        udc->clocked = 0;
 911        udc->gadget.speed = USB_SPEED_UNKNOWN;
 912        clk_disable(udc->fclk);
 913        clk_disable(udc->iclk);
 914}
 915
 916/*
 917 * activate/deactivate link with host; minimize power usage for
 918 * inactive links by cutting clocks and transceiver power.
 919 */
 920static void pullup(struct at91_udc *udc, int is_on)
 921{
 922        if (!udc->enabled || !udc->vbus)
 923                is_on = 0;
 924        DBG("%sactive\n", is_on ? "" : "in");
 925
 926        if (is_on) {
 927                clk_on(udc);
 928                at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
 929                at91_udp_write(udc, AT91_UDP_TXVC, 0);
 930        } else {
 931                stop_activity(udc);
 932                at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
 933                at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
 934                clk_off(udc);
 935        }
 936
 937        if (udc->caps && udc->caps->pullup)
 938                udc->caps->pullup(udc, is_on);
 939}
 940
 941/* vbus is here!  turn everything on that's ready */
 942static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
 943{
 944        struct at91_udc *udc = to_udc(gadget);
 945        unsigned long   flags;
 946
 947        /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
 948        spin_lock_irqsave(&udc->lock, flags);
 949        udc->vbus = (is_active != 0);
 950        if (udc->driver)
 951                pullup(udc, is_active);
 952        else
 953                pullup(udc, 0);
 954        spin_unlock_irqrestore(&udc->lock, flags);
 955        return 0;
 956}
 957
 958static int at91_pullup(struct usb_gadget *gadget, int is_on)
 959{
 960        struct at91_udc *udc = to_udc(gadget);
 961        unsigned long   flags;
 962
 963        spin_lock_irqsave(&udc->lock, flags);
 964        udc->enabled = is_on = !!is_on;
 965        pullup(udc, is_on);
 966        spin_unlock_irqrestore(&udc->lock, flags);
 967        return 0;
 968}
 969
 970static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
 971{
 972        struct at91_udc *udc = to_udc(gadget);
 973        unsigned long   flags;
 974
 975        spin_lock_irqsave(&udc->lock, flags);
 976        gadget->is_selfpowered = (is_on != 0);
 977        spin_unlock_irqrestore(&udc->lock, flags);
 978        return 0;
 979}
 980
 981static int at91_start(struct usb_gadget *gadget,
 982                struct usb_gadget_driver *driver);
 983static int at91_stop(struct usb_gadget *gadget);
 984
 985static const struct usb_gadget_ops at91_udc_ops = {
 986        .get_frame              = at91_get_frame,
 987        .wakeup                 = at91_wakeup,
 988        .set_selfpowered        = at91_set_selfpowered,
 989        .vbus_session           = at91_vbus_session,
 990        .pullup                 = at91_pullup,
 991        .udc_start              = at91_start,
 992        .udc_stop               = at91_stop,
 993
 994        /*
 995         * VBUS-powered devices may also also want to support bigger
 996         * power budgets after an appropriate SET_CONFIGURATION.
 997         */
 998        /* .vbus_power          = at91_vbus_power, */
 999};
1000
1001/*-------------------------------------------------------------------------*/
1002
1003static int handle_ep(struct at91_ep *ep)
1004{
1005        struct at91_request     *req;
1006        u32 __iomem             *creg = ep->creg;
1007        u32                     csr = __raw_readl(creg);
1008
1009        if (!list_empty(&ep->queue))
1010                req = list_entry(ep->queue.next,
1011                        struct at91_request, queue);
1012        else
1013                req = NULL;
1014
1015        if (ep->is_in) {
1016                if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1017                        csr |= CLR_FX;
1018                        csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1019                        __raw_writel(csr, creg);
1020                }
1021                if (req)
1022                        return write_fifo(ep, req);
1023
1024        } else {
1025                if (csr & AT91_UDP_STALLSENT) {
1026                        /* STALLSENT bit == ISOERR */
1027                        if (ep->is_iso && req)
1028                                req->req.status = -EILSEQ;
1029                        csr |= CLR_FX;
1030                        csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1031                        __raw_writel(csr, creg);
1032                        csr = __raw_readl(creg);
1033                }
1034                if (req && (csr & RX_DATA_READY))
1035                        return read_fifo(ep, req);
1036        }
1037        return 0;
1038}
1039
1040union setup {
1041        u8                      raw[8];
1042        struct usb_ctrlrequest  r;
1043};
1044
1045static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1046{
1047        u32 __iomem     *creg = ep->creg;
1048        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1049        unsigned        rxcount, i = 0;
1050        u32             tmp;
1051        union setup     pkt;
1052        int             status = 0;
1053
1054        /* read and ack SETUP; hard-fail for bogus packets */
1055        rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1056        if (likely(rxcount == 8)) {
1057                while (rxcount--)
1058                        pkt.raw[i++] = __raw_readb(dreg);
1059                if (pkt.r.bRequestType & USB_DIR_IN) {
1060                        csr |= AT91_UDP_DIR;
1061                        ep->is_in = 1;
1062                } else {
1063                        csr &= ~AT91_UDP_DIR;
1064                        ep->is_in = 0;
1065                }
1066        } else {
1067                /* REVISIT this happens sometimes under load; why?? */
1068                ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1069                status = -EINVAL;
1070        }
1071        csr |= CLR_FX;
1072        csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1073        __raw_writel(csr, creg);
1074        udc->wait_for_addr_ack = 0;
1075        udc->wait_for_config_ack = 0;
1076        ep->stopped = 0;
1077        if (unlikely(status != 0))
1078                goto stall;
1079
1080#define w_index         le16_to_cpu(pkt.r.wIndex)
1081#define w_value         le16_to_cpu(pkt.r.wValue)
1082#define w_length        le16_to_cpu(pkt.r.wLength)
1083
1084        VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1085                        pkt.r.bRequestType, pkt.r.bRequest,
1086                        w_value, w_index, w_length);
1087
1088        /*
1089         * A few standard requests get handled here, ones that touch
1090         * hardware ... notably for device and endpoint features.
1091         */
1092        udc->req_pending = 1;
1093        csr = __raw_readl(creg);
1094        csr |= CLR_FX;
1095        csr &= ~SET_FX;
1096        switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1097
1098        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1099                        | USB_REQ_SET_ADDRESS:
1100                __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1101                udc->addr = w_value;
1102                udc->wait_for_addr_ack = 1;
1103                udc->req_pending = 0;
1104                /* FADDR is set later, when we ack host STATUS */
1105                return;
1106
1107        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1108                        | USB_REQ_SET_CONFIGURATION:
1109                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1110                if (pkt.r.wValue)
1111                        udc->wait_for_config_ack = (tmp == 0);
1112                else
1113                        udc->wait_for_config_ack = (tmp != 0);
1114                if (udc->wait_for_config_ack)
1115                        VDBG("wait for config\n");
1116                /* CONFG is toggled later, if gadget driver succeeds */
1117                break;
1118
1119        /*
1120         * Hosts may set or clear remote wakeup status, and
1121         * devices may report they're VBUS powered.
1122         */
1123        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1124                        | USB_REQ_GET_STATUS:
1125                tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1126                if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1127                        tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1128                PACKET("get device status\n");
1129                __raw_writeb(tmp, dreg);
1130                __raw_writeb(0, dreg);
1131                goto write_in;
1132                /* then STATUS starts later, automatically */
1133        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1134                        | USB_REQ_SET_FEATURE:
1135                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1136                        goto stall;
1137                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1138                tmp |= AT91_UDP_ESR;
1139                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1140                goto succeed;
1141        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1142                        | USB_REQ_CLEAR_FEATURE:
1143                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1144                        goto stall;
1145                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1146                tmp &= ~AT91_UDP_ESR;
1147                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1148                goto succeed;
1149
1150        /*
1151         * Interfaces have no feature settings; this is pretty useless.
1152         * we won't even insist the interface exists...
1153         */
1154        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1155                        | USB_REQ_GET_STATUS:
1156                PACKET("get interface status\n");
1157                __raw_writeb(0, dreg);
1158                __raw_writeb(0, dreg);
1159                goto write_in;
1160                /* then STATUS starts later, automatically */
1161        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1162                        | USB_REQ_SET_FEATURE:
1163        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1164                        | USB_REQ_CLEAR_FEATURE:
1165                goto stall;
1166
1167        /*
1168         * Hosts may clear bulk/intr endpoint halt after the gadget
1169         * driver sets it (not widely used); or set it (for testing)
1170         */
1171        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1172                        | USB_REQ_GET_STATUS:
1173                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1174                ep = &udc->ep[tmp];
1175                if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1176                        goto stall;
1177
1178                if (tmp) {
1179                        if ((w_index & USB_DIR_IN)) {
1180                                if (!ep->is_in)
1181                                        goto stall;
1182                        } else if (ep->is_in)
1183                                goto stall;
1184                }
1185                PACKET("get %s status\n", ep->ep.name);
1186                if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1187                        tmp = (1 << USB_ENDPOINT_HALT);
1188                else
1189                        tmp = 0;
1190                __raw_writeb(tmp, dreg);
1191                __raw_writeb(0, dreg);
1192                goto write_in;
1193                /* then STATUS starts later, automatically */
1194        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1195                        | USB_REQ_SET_FEATURE:
1196                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1197                ep = &udc->ep[tmp];
1198                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1199                        goto stall;
1200                if (!ep->ep.desc || ep->is_iso)
1201                        goto stall;
1202                if ((w_index & USB_DIR_IN)) {
1203                        if (!ep->is_in)
1204                                goto stall;
1205                } else if (ep->is_in)
1206                        goto stall;
1207
1208                tmp = __raw_readl(ep->creg);
1209                tmp &= ~SET_FX;
1210                tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1211                __raw_writel(tmp, ep->creg);
1212                goto succeed;
1213        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1214                        | USB_REQ_CLEAR_FEATURE:
1215                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1216                ep = &udc->ep[tmp];
1217                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1218                        goto stall;
1219                if (tmp == 0)
1220                        goto succeed;
1221                if (!ep->ep.desc || ep->is_iso)
1222                        goto stall;
1223                if ((w_index & USB_DIR_IN)) {
1224                        if (!ep->is_in)
1225                                goto stall;
1226                } else if (ep->is_in)
1227                        goto stall;
1228
1229                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1230                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1231                tmp = __raw_readl(ep->creg);
1232                tmp |= CLR_FX;
1233                tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1234                __raw_writel(tmp, ep->creg);
1235                if (!list_empty(&ep->queue))
1236                        handle_ep(ep);
1237                goto succeed;
1238        }
1239
1240#undef w_value
1241#undef w_index
1242#undef w_length
1243
1244        /* pass request up to the gadget driver */
1245        if (udc->driver) {
1246                spin_unlock(&udc->lock);
1247                status = udc->driver->setup(&udc->gadget, &pkt.r);
1248                spin_lock(&udc->lock);
1249        }
1250        else
1251                status = -ENODEV;
1252        if (status < 0) {
1253stall:
1254                VDBG("req %02x.%02x protocol STALL; stat %d\n",
1255                                pkt.r.bRequestType, pkt.r.bRequest, status);
1256                csr |= AT91_UDP_FORCESTALL;
1257                __raw_writel(csr, creg);
1258                udc->req_pending = 0;
1259        }
1260        return;
1261
1262succeed:
1263        /* immediate successful (IN) STATUS after zero length DATA */
1264        PACKET("ep0 in/status\n");
1265write_in:
1266        csr |= AT91_UDP_TXPKTRDY;
1267        __raw_writel(csr, creg);
1268        udc->req_pending = 0;
1269}
1270
1271static void handle_ep0(struct at91_udc *udc)
1272{
1273        struct at91_ep          *ep0 = &udc->ep[0];
1274        u32 __iomem             *creg = ep0->creg;
1275        u32                     csr = __raw_readl(creg);
1276        struct at91_request     *req;
1277
1278        if (unlikely(csr & AT91_UDP_STALLSENT)) {
1279                nuke(ep0, -EPROTO);
1280                udc->req_pending = 0;
1281                csr |= CLR_FX;
1282                csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1283                __raw_writel(csr, creg);
1284                VDBG("ep0 stalled\n");
1285                csr = __raw_readl(creg);
1286        }
1287        if (csr & AT91_UDP_RXSETUP) {
1288                nuke(ep0, 0);
1289                udc->req_pending = 0;
1290                handle_setup(udc, ep0, csr);
1291                return;
1292        }
1293
1294        if (list_empty(&ep0->queue))
1295                req = NULL;
1296        else
1297                req = list_entry(ep0->queue.next, struct at91_request, queue);
1298
1299        /* host ACKed an IN packet that we sent */
1300        if (csr & AT91_UDP_TXCOMP) {
1301                csr |= CLR_FX;
1302                csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1303
1304                /* write more IN DATA? */
1305                if (req && ep0->is_in) {
1306                        if (handle_ep(ep0))
1307                                udc->req_pending = 0;
1308
1309                /*
1310                 * Ack after:
1311                 *  - last IN DATA packet (including GET_STATUS)
1312                 *  - IN/STATUS for OUT DATA
1313                 *  - IN/STATUS for any zero-length DATA stage
1314                 * except for the IN DATA case, the host should send
1315                 * an OUT status later, which we'll ack.
1316                 */
1317                } else {
1318                        udc->req_pending = 0;
1319                        __raw_writel(csr, creg);
1320
1321                        /*
1322                         * SET_ADDRESS takes effect only after the STATUS
1323                         * (to the original address) gets acked.
1324                         */
1325                        if (udc->wait_for_addr_ack) {
1326                                u32     tmp;
1327
1328                                at91_udp_write(udc, AT91_UDP_FADDR,
1329                                                AT91_UDP_FEN | udc->addr);
1330                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1331                                tmp &= ~AT91_UDP_FADDEN;
1332                                if (udc->addr)
1333                                        tmp |= AT91_UDP_FADDEN;
1334                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1335
1336                                udc->wait_for_addr_ack = 0;
1337                                VDBG("address %d\n", udc->addr);
1338                        }
1339                }
1340        }
1341
1342        /* OUT packet arrived ... */
1343        else if (csr & AT91_UDP_RX_DATA_BK0) {
1344                csr |= CLR_FX;
1345                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1346
1347                /* OUT DATA stage */
1348                if (!ep0->is_in) {
1349                        if (req) {
1350                                if (handle_ep(ep0)) {
1351                                        /* send IN/STATUS */
1352                                        PACKET("ep0 in/status\n");
1353                                        csr = __raw_readl(creg);
1354                                        csr &= ~SET_FX;
1355                                        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1356                                        __raw_writel(csr, creg);
1357                                        udc->req_pending = 0;
1358                                }
1359                        } else if (udc->req_pending) {
1360                                /*
1361                                 * AT91 hardware has a hard time with this
1362                                 * "deferred response" mode for control-OUT
1363                                 * transfers.  (For control-IN it's fine.)
1364                                 *
1365                                 * The normal solution leaves OUT data in the
1366                                 * fifo until the gadget driver is ready.
1367                                 * We couldn't do that here without disabling
1368                                 * the IRQ that tells about SETUP packets,
1369                                 * e.g. when the host gets impatient...
1370                                 *
1371                                 * Working around it by copying into a buffer
1372                                 * would almost be a non-deferred response,
1373                                 * except that it wouldn't permit reliable
1374                                 * stalling of the request.  Instead, demand
1375                                 * that gadget drivers not use this mode.
1376                                 */
1377                                DBG("no control-OUT deferred responses!\n");
1378                                __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1379                                udc->req_pending = 0;
1380                        }
1381
1382                /* STATUS stage for control-IN; ack.  */
1383                } else {
1384                        PACKET("ep0 out/status ACK\n");
1385                        __raw_writel(csr, creg);
1386
1387                        /* "early" status stage */
1388                        if (req)
1389                                done(ep0, req, 0);
1390                }
1391        }
1392}
1393
1394static irqreturn_t at91_udc_irq (int irq, void *_udc)
1395{
1396        struct at91_udc         *udc = _udc;
1397        u32                     rescans = 5;
1398        int                     disable_clock = 0;
1399        unsigned long           flags;
1400
1401        spin_lock_irqsave(&udc->lock, flags);
1402
1403        if (!udc->clocked) {
1404                clk_on(udc);
1405                disable_clock = 1;
1406        }
1407
1408        while (rescans--) {
1409                u32 status;
1410
1411                status = at91_udp_read(udc, AT91_UDP_ISR)
1412                        & at91_udp_read(udc, AT91_UDP_IMR);
1413                if (!status)
1414                        break;
1415
1416                /* USB reset irq:  not maskable */
1417                if (status & AT91_UDP_ENDBUSRES) {
1418                        at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1419                        at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1420                        /* Atmel code clears this irq twice */
1421                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1422                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1423                        VDBG("end bus reset\n");
1424                        udc->addr = 0;
1425                        reset_gadget(udc);
1426
1427                        /* enable ep0 */
1428                        at91_udp_write(udc, AT91_UDP_CSR(0),
1429                                        AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1430                        udc->gadget.speed = USB_SPEED_FULL;
1431                        udc->suspended = 0;
1432                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1433
1434                        /*
1435                         * NOTE:  this driver keeps clocks off unless the
1436                         * USB host is present.  That saves power, but for
1437                         * boards that don't support VBUS detection, both
1438                         * clocks need to be active most of the time.
1439                         */
1440
1441                /* host initiated suspend (3+ms bus idle) */
1442                } else if (status & AT91_UDP_RXSUSP) {
1443                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1444                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1445                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1446                        /* VDBG("bus suspend\n"); */
1447                        if (udc->suspended)
1448                                continue;
1449                        udc->suspended = 1;
1450
1451                        /*
1452                         * NOTE:  when suspending a VBUS-powered device, the
1453                         * gadget driver should switch into slow clock mode
1454                         * and then into standby to avoid drawing more than
1455                         * 500uA power (2500uA for some high-power configs).
1456                         */
1457                        if (udc->driver && udc->driver->suspend) {
1458                                spin_unlock(&udc->lock);
1459                                udc->driver->suspend(&udc->gadget);
1460                                spin_lock(&udc->lock);
1461                        }
1462
1463                /* host initiated resume */
1464                } else if (status & AT91_UDP_RXRSM) {
1465                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1466                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1467                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1468                        /* VDBG("bus resume\n"); */
1469                        if (!udc->suspended)
1470                                continue;
1471                        udc->suspended = 0;
1472
1473                        /*
1474                         * NOTE:  for a VBUS-powered device, the gadget driver
1475                         * would normally want to switch out of slow clock
1476                         * mode into normal mode.
1477                         */
1478                        if (udc->driver && udc->driver->resume) {
1479                                spin_unlock(&udc->lock);
1480                                udc->driver->resume(&udc->gadget);
1481                                spin_lock(&udc->lock);
1482                        }
1483
1484                /* endpoint IRQs are cleared by handling them */
1485                } else {
1486                        int             i;
1487                        unsigned        mask = 1;
1488                        struct at91_ep  *ep = &udc->ep[1];
1489
1490                        if (status & mask)
1491                                handle_ep0(udc);
1492                        for (i = 1; i < NUM_ENDPOINTS; i++) {
1493                                mask <<= 1;
1494                                if (status & mask)
1495                                        handle_ep(ep);
1496                                ep++;
1497                        }
1498                }
1499        }
1500
1501        if (disable_clock)
1502                clk_off(udc);
1503
1504        spin_unlock_irqrestore(&udc->lock, flags);
1505
1506        return IRQ_HANDLED;
1507}
1508
1509/*-------------------------------------------------------------------------*/
1510
1511static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1512{
1513        value ^= udc->board.vbus_active_low;
1514        if (value != udc->vbus)
1515                at91_vbus_session(&udc->gadget, value);
1516}
1517
1518static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1519{
1520        struct at91_udc *udc = _udc;
1521
1522        /* vbus needs at least brief debouncing */
1523        udelay(10);
1524        at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1525
1526        return IRQ_HANDLED;
1527}
1528
1529static void at91_vbus_timer_work(struct work_struct *work)
1530{
1531        struct at91_udc *udc = container_of(work, struct at91_udc,
1532                                            vbus_timer_work);
1533
1534        at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1535
1536        if (!timer_pending(&udc->vbus_timer))
1537                mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1538}
1539
1540static void at91_vbus_timer(struct timer_list *t)
1541{
1542        struct at91_udc *udc = from_timer(udc, t, vbus_timer);
1543
1544        /*
1545         * If we are polling vbus it is likely that the gpio is on an
1546         * bus such as i2c or spi which may sleep, so schedule some work
1547         * to read the vbus gpio
1548         */
1549        schedule_work(&udc->vbus_timer_work);
1550}
1551
1552static int at91_start(struct usb_gadget *gadget,
1553                struct usb_gadget_driver *driver)
1554{
1555        struct at91_udc *udc;
1556
1557        udc = container_of(gadget, struct at91_udc, gadget);
1558        udc->driver = driver;
1559        udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1560        udc->enabled = 1;
1561        udc->gadget.is_selfpowered = 1;
1562
1563        return 0;
1564}
1565
1566static int at91_stop(struct usb_gadget *gadget)
1567{
1568        struct at91_udc *udc;
1569        unsigned long   flags;
1570
1571        udc = container_of(gadget, struct at91_udc, gadget);
1572        spin_lock_irqsave(&udc->lock, flags);
1573        udc->enabled = 0;
1574        at91_udp_write(udc, AT91_UDP_IDR, ~0);
1575        spin_unlock_irqrestore(&udc->lock, flags);
1576
1577        udc->driver = NULL;
1578
1579        return 0;
1580}
1581
1582/*-------------------------------------------------------------------------*/
1583
1584static void at91udc_shutdown(struct platform_device *dev)
1585{
1586        struct at91_udc *udc = platform_get_drvdata(dev);
1587        unsigned long   flags;
1588
1589        /* force disconnect on reboot */
1590        spin_lock_irqsave(&udc->lock, flags);
1591        pullup(platform_get_drvdata(dev), 0);
1592        spin_unlock_irqrestore(&udc->lock, flags);
1593}
1594
1595static int at91rm9200_udc_init(struct at91_udc *udc)
1596{
1597        struct at91_ep *ep;
1598        int ret;
1599        int i;
1600
1601        for (i = 0; i < NUM_ENDPOINTS; i++) {
1602                ep = &udc->ep[i];
1603
1604                switch (i) {
1605                case 0:
1606                case 3:
1607                        ep->maxpacket = 8;
1608                        break;
1609                case 1 ... 2:
1610                        ep->maxpacket = 64;
1611                        break;
1612                case 4 ... 5:
1613                        ep->maxpacket = 256;
1614                        break;
1615                }
1616        }
1617
1618        if (!gpio_is_valid(udc->board.pullup_pin)) {
1619                DBG("no D+ pullup?\n");
1620                return -ENODEV;
1621        }
1622
1623        ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
1624                                "udc_pullup");
1625        if (ret) {
1626                DBG("D+ pullup is busy\n");
1627                return ret;
1628        }
1629
1630        gpio_direction_output(udc->board.pullup_pin,
1631                              udc->board.pullup_active_low);
1632
1633        return 0;
1634}
1635
1636static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1637{
1638        int active = !udc->board.pullup_active_low;
1639
1640        if (is_on)
1641                gpio_set_value(udc->board.pullup_pin, active);
1642        else
1643                gpio_set_value(udc->board.pullup_pin, !active);
1644}
1645
1646static const struct at91_udc_caps at91rm9200_udc_caps = {
1647        .init = at91rm9200_udc_init,
1648        .pullup = at91rm9200_udc_pullup,
1649};
1650
1651static int at91sam9260_udc_init(struct at91_udc *udc)
1652{
1653        struct at91_ep *ep;
1654        int i;
1655
1656        for (i = 0; i < NUM_ENDPOINTS; i++) {
1657                ep = &udc->ep[i];
1658
1659                switch (i) {
1660                case 0 ... 3:
1661                        ep->maxpacket = 64;
1662                        break;
1663                case 4 ... 5:
1664                        ep->maxpacket = 512;
1665                        break;
1666                }
1667        }
1668
1669        return 0;
1670}
1671
1672static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1673{
1674        u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1675
1676        if (is_on)
1677                txvc |= AT91_UDP_TXVC_PUON;
1678        else
1679                txvc &= ~AT91_UDP_TXVC_PUON;
1680
1681        at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1682}
1683
1684static const struct at91_udc_caps at91sam9260_udc_caps = {
1685        .init = at91sam9260_udc_init,
1686        .pullup = at91sam9260_udc_pullup,
1687};
1688
1689static int at91sam9261_udc_init(struct at91_udc *udc)
1690{
1691        struct at91_ep *ep;
1692        int i;
1693
1694        for (i = 0; i < NUM_ENDPOINTS; i++) {
1695                ep = &udc->ep[i];
1696
1697                switch (i) {
1698                case 0:
1699                        ep->maxpacket = 8;
1700                        break;
1701                case 1 ... 3:
1702                        ep->maxpacket = 64;
1703                        break;
1704                case 4 ... 5:
1705                        ep->maxpacket = 256;
1706                        break;
1707                }
1708        }
1709
1710        udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1711                                                      "atmel,matrix");
1712        return PTR_ERR_OR_ZERO(udc->matrix);
1713}
1714
1715static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1716{
1717        u32 usbpucr = 0;
1718
1719        if (is_on)
1720                usbpucr = AT91_MATRIX_USBPUCR_PUON;
1721
1722        regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1723                           AT91_MATRIX_USBPUCR_PUON, usbpucr);
1724}
1725
1726static const struct at91_udc_caps at91sam9261_udc_caps = {
1727        .init = at91sam9261_udc_init,
1728        .pullup = at91sam9261_udc_pullup,
1729};
1730
1731static int at91sam9263_udc_init(struct at91_udc *udc)
1732{
1733        struct at91_ep *ep;
1734        int i;
1735
1736        for (i = 0; i < NUM_ENDPOINTS; i++) {
1737                ep = &udc->ep[i];
1738
1739                switch (i) {
1740                case 0:
1741                case 1:
1742                case 2:
1743                case 3:
1744                        ep->maxpacket = 64;
1745                        break;
1746                case 4:
1747                case 5:
1748                        ep->maxpacket = 256;
1749                        break;
1750                }
1751        }
1752
1753        return 0;
1754}
1755
1756static const struct at91_udc_caps at91sam9263_udc_caps = {
1757        .init = at91sam9263_udc_init,
1758        .pullup = at91sam9260_udc_pullup,
1759};
1760
1761static const struct of_device_id at91_udc_dt_ids[] = {
1762        {
1763                .compatible = "atmel,at91rm9200-udc",
1764                .data = &at91rm9200_udc_caps,
1765        },
1766        {
1767                .compatible = "atmel,at91sam9260-udc",
1768                .data = &at91sam9260_udc_caps,
1769        },
1770        {
1771                .compatible = "atmel,at91sam9261-udc",
1772                .data = &at91sam9261_udc_caps,
1773        },
1774        {
1775                .compatible = "atmel,at91sam9263-udc",
1776                .data = &at91sam9263_udc_caps,
1777        },
1778        { /* sentinel */ }
1779};
1780MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1781
1782static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1783{
1784        struct at91_udc_data *board = &udc->board;
1785        const struct of_device_id *match;
1786        enum of_gpio_flags flags;
1787        u32 val;
1788
1789        if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1790                board->vbus_polled = 1;
1791
1792        board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1793                                                  &flags);
1794        board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1795
1796        board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1797                                                  &flags);
1798
1799        board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1800
1801        match = of_match_node(at91_udc_dt_ids, np);
1802        if (match)
1803                udc->caps = match->data;
1804}
1805
1806static int at91udc_probe(struct platform_device *pdev)
1807{
1808        struct device   *dev = &pdev->dev;
1809        struct at91_udc *udc;
1810        int             retval;
1811        struct at91_ep  *ep;
1812        int             i;
1813
1814        udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1815        if (!udc)
1816                return -ENOMEM;
1817
1818        /* init software state */
1819        udc->gadget.dev.parent = dev;
1820        at91udc_of_init(udc, pdev->dev.of_node);
1821        udc->pdev = pdev;
1822        udc->enabled = 0;
1823        spin_lock_init(&udc->lock);
1824
1825        udc->gadget.ops = &at91_udc_ops;
1826        udc->gadget.ep0 = &udc->ep[0].ep;
1827        udc->gadget.name = driver_name;
1828        udc->gadget.dev.init_name = "gadget";
1829
1830        for (i = 0; i < NUM_ENDPOINTS; i++) {
1831                ep = &udc->ep[i];
1832                ep->ep.name = ep_info[i].name;
1833                ep->ep.caps = ep_info[i].caps;
1834                ep->ep.ops = &at91_ep_ops;
1835                ep->udc = udc;
1836                ep->int_mask = BIT(i);
1837                if (i != 0 && i != 3)
1838                        ep->is_pingpong = 1;
1839        }
1840
1841        udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0);
1842        if (IS_ERR(udc->udp_baseaddr))
1843                return PTR_ERR(udc->udp_baseaddr);
1844
1845        if (udc->caps && udc->caps->init) {
1846                retval = udc->caps->init(udc);
1847                if (retval)
1848                        return retval;
1849        }
1850
1851        udc_reinit(udc);
1852
1853        /* get interface and function clocks */
1854        udc->iclk = devm_clk_get(dev, "pclk");
1855        if (IS_ERR(udc->iclk))
1856                return PTR_ERR(udc->iclk);
1857
1858        udc->fclk = devm_clk_get(dev, "hclk");
1859        if (IS_ERR(udc->fclk))
1860                return PTR_ERR(udc->fclk);
1861
1862        /* don't do anything until we have both gadget driver and VBUS */
1863        clk_set_rate(udc->fclk, 48000000);
1864        retval = clk_prepare(udc->fclk);
1865        if (retval)
1866                return retval;
1867
1868        retval = clk_prepare_enable(udc->iclk);
1869        if (retval)
1870                goto err_unprepare_fclk;
1871
1872        at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1873        at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1874        /* Clear all pending interrupts - UDP may be used by bootloader. */
1875        at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1876        clk_disable(udc->iclk);
1877
1878        /* request UDC and maybe VBUS irqs */
1879        udc->udp_irq = platform_get_irq(pdev, 0);
1880        retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1881                                  driver_name, udc);
1882        if (retval) {
1883                DBG("request irq %d failed\n", udc->udp_irq);
1884                goto err_unprepare_iclk;
1885        }
1886
1887        if (gpio_is_valid(udc->board.vbus_pin)) {
1888                retval = devm_gpio_request(dev, udc->board.vbus_pin,
1889                                           "udc_vbus");
1890                if (retval) {
1891                        DBG("request vbus pin failed\n");
1892                        goto err_unprepare_iclk;
1893                }
1894
1895                gpio_direction_input(udc->board.vbus_pin);
1896
1897                /*
1898                 * Get the initial state of VBUS - we cannot expect
1899                 * a pending interrupt.
1900                 */
1901                udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1902                        udc->board.vbus_active_low;
1903
1904                if (udc->board.vbus_polled) {
1905                        INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1906                        timer_setup(&udc->vbus_timer, at91_vbus_timer, 0);
1907                        mod_timer(&udc->vbus_timer,
1908                                  jiffies + VBUS_POLL_TIMEOUT);
1909                } else {
1910                        retval = devm_request_irq(dev,
1911                                        gpio_to_irq(udc->board.vbus_pin),
1912                                        at91_vbus_irq, 0, driver_name, udc);
1913                        if (retval) {
1914                                DBG("request vbus irq %d failed\n",
1915                                    udc->board.vbus_pin);
1916                                goto err_unprepare_iclk;
1917                        }
1918                }
1919        } else {
1920                DBG("no VBUS detection, assuming always-on\n");
1921                udc->vbus = 1;
1922        }
1923        retval = usb_add_gadget_udc(dev, &udc->gadget);
1924        if (retval)
1925                goto err_unprepare_iclk;
1926        dev_set_drvdata(dev, udc);
1927        device_init_wakeup(dev, 1);
1928        create_debug_file(udc);
1929
1930        INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1931        return 0;
1932
1933err_unprepare_iclk:
1934        clk_unprepare(udc->iclk);
1935err_unprepare_fclk:
1936        clk_unprepare(udc->fclk);
1937
1938        DBG("%s probe failed, %d\n", driver_name, retval);
1939
1940        return retval;
1941}
1942
1943static int at91udc_remove(struct platform_device *pdev)
1944{
1945        struct at91_udc *udc = platform_get_drvdata(pdev);
1946        unsigned long   flags;
1947
1948        DBG("remove\n");
1949
1950        usb_del_gadget_udc(&udc->gadget);
1951        if (udc->driver)
1952                return -EBUSY;
1953
1954        spin_lock_irqsave(&udc->lock, flags);
1955        pullup(udc, 0);
1956        spin_unlock_irqrestore(&udc->lock, flags);
1957
1958        device_init_wakeup(&pdev->dev, 0);
1959        remove_debug_file(udc);
1960        clk_unprepare(udc->fclk);
1961        clk_unprepare(udc->iclk);
1962
1963        return 0;
1964}
1965
1966#ifdef CONFIG_PM
1967static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1968{
1969        struct at91_udc *udc = platform_get_drvdata(pdev);
1970        int             wake = udc->driver && device_may_wakeup(&pdev->dev);
1971        unsigned long   flags;
1972
1973        /* Unless we can act normally to the host (letting it wake us up
1974         * whenever it has work for us) force disconnect.  Wakeup requires
1975         * PLLB for USB events (signaling for reset, wakeup, or incoming
1976         * tokens) and VBUS irqs (on systems which support them).
1977         */
1978        if ((!udc->suspended && udc->addr)
1979                        || !wake
1980                        || at91_suspend_entering_slow_clock()) {
1981                spin_lock_irqsave(&udc->lock, flags);
1982                pullup(udc, 0);
1983                wake = 0;
1984                spin_unlock_irqrestore(&udc->lock, flags);
1985        } else
1986                enable_irq_wake(udc->udp_irq);
1987
1988        udc->active_suspend = wake;
1989        if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1990                enable_irq_wake(udc->board.vbus_pin);
1991        return 0;
1992}
1993
1994static int at91udc_resume(struct platform_device *pdev)
1995{
1996        struct at91_udc *udc = platform_get_drvdata(pdev);
1997        unsigned long   flags;
1998
1999        if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
2000            udc->active_suspend)
2001                disable_irq_wake(udc->board.vbus_pin);
2002
2003        /* maybe reconnect to host; if so, clocks on */
2004        if (udc->active_suspend)
2005                disable_irq_wake(udc->udp_irq);
2006        else {
2007                spin_lock_irqsave(&udc->lock, flags);
2008                pullup(udc, 1);
2009                spin_unlock_irqrestore(&udc->lock, flags);
2010        }
2011        return 0;
2012}
2013#else
2014#define at91udc_suspend NULL
2015#define at91udc_resume  NULL
2016#endif
2017
2018static struct platform_driver at91_udc_driver = {
2019        .remove         = at91udc_remove,
2020        .shutdown       = at91udc_shutdown,
2021        .suspend        = at91udc_suspend,
2022        .resume         = at91udc_resume,
2023        .driver         = {
2024                .name   = driver_name,
2025                .of_match_table = at91_udc_dt_ids,
2026        },
2027};
2028
2029module_platform_driver_probe(at91_udc_driver, at91udc_probe);
2030
2031MODULE_DESCRIPTION("AT91 udc driver");
2032MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2033MODULE_LICENSE("GPL");
2034MODULE_ALIAS("platform:at91_udc");
2035
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