linux/drivers/usb/gadget/udc/at91_udc.c
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   1/*
   2 * at91_udc -- driver for at91-series USB peripheral controller
   3 *
   4 * Copyright (C) 2004 by Thomas Rathbone
   5 * Copyright (C) 2005 by HP Labs
   6 * Copyright (C) 2005 by David Brownell
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 */
  13
  14#undef  VERBOSE_DEBUG
  15#undef  PACKET_TRACE
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/platform_device.h>
  20#include <linux/delay.h>
  21#include <linux/ioport.h>
  22#include <linux/slab.h>
  23#include <linux/errno.h>
  24#include <linux/list.h>
  25#include <linux/interrupt.h>
  26#include <linux/proc_fs.h>
  27#include <linux/prefetch.h>
  28#include <linux/clk.h>
  29#include <linux/usb/ch9.h>
  30#include <linux/usb/gadget.h>
  31#include <linux/of.h>
  32#include <linux/of_gpio.h>
  33#include <linux/platform_data/atmel.h>
  34#include <linux/regmap.h>
  35#include <linux/mfd/syscon.h>
  36#include <linux/mfd/syscon/atmel-matrix.h>
  37
  38#include "at91_udc.h"
  39
  40
  41/*
  42 * This controller is simple and PIO-only.  It's used in many AT91-series
  43 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
  44 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
  45 *
  46 * This driver expects the board has been wired with two GPIOs supporting
  47 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
  48 * testing hasn't covered such cases.)
  49 *
  50 * The pullup is most important (so it's integrated on sam926x parts).  It
  51 * provides software control over whether the host enumerates the device.
  52 *
  53 * The VBUS sensing helps during enumeration, and allows both USB clocks
  54 * (and the transceiver) to stay gated off until they're necessary, saving
  55 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
  56 * it may also be gated off by software during some Linux sleep states.
  57 */
  58
  59#define DRIVER_VERSION  "3 May 2006"
  60
  61static const char driver_name [] = "at91_udc";
  62
  63static const struct {
  64        const char *name;
  65        const struct usb_ep_caps caps;
  66} ep_info[] = {
  67#define EP_INFO(_name, _caps) \
  68        { \
  69                .name = _name, \
  70                .caps = _caps, \
  71        }
  72
  73        EP_INFO("ep0",
  74                USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  75        EP_INFO("ep1",
  76                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  77        EP_INFO("ep2",
  78                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  79        EP_INFO("ep3-int",
  80                USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)),
  81        EP_INFO("ep4",
  82                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  83        EP_INFO("ep5",
  84                USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  85
  86#undef EP_INFO
  87};
  88
  89#define ep0name         ep_info[0].name
  90
  91#define VBUS_POLL_TIMEOUT       msecs_to_jiffies(1000)
  92
  93#define at91_udp_read(udc, reg) \
  94        __raw_readl((udc)->udp_baseaddr + (reg))
  95#define at91_udp_write(udc, reg, val) \
  96        __raw_writel((val), (udc)->udp_baseaddr + (reg))
  97
  98/*-------------------------------------------------------------------------*/
  99
 100#ifdef CONFIG_USB_GADGET_DEBUG_FILES
 101
 102#include <linux/seq_file.h>
 103
 104static const char debug_filename[] = "driver/udc";
 105
 106#define FOURBITS "%s%s%s%s"
 107#define EIGHTBITS FOURBITS FOURBITS
 108
 109static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
 110{
 111        static char             *types[] = {
 112                "control", "out-iso", "out-bulk", "out-int",
 113                "BOGUS",   "in-iso",  "in-bulk",  "in-int"};
 114
 115        u32                     csr;
 116        struct at91_request     *req;
 117        unsigned long   flags;
 118        struct at91_udc *udc = ep->udc;
 119
 120        spin_lock_irqsave(&udc->lock, flags);
 121
 122        csr = __raw_readl(ep->creg);
 123
 124        /* NOTE:  not collecting per-endpoint irq statistics... */
 125
 126        seq_printf(s, "\n");
 127        seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
 128                        ep->ep.name, ep->ep.maxpacket,
 129                        ep->is_in ? "in" : "out",
 130                        ep->is_iso ? " iso" : "",
 131                        ep->is_pingpong
 132                                ? (ep->fifo_bank ? "pong" : "ping")
 133                                : "",
 134                        ep->stopped ? " stopped" : "");
 135        seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
 136                csr,
 137                (csr & 0x07ff0000) >> 16,
 138                (csr & (1 << 15)) ? "enabled" : "disabled",
 139                (csr & (1 << 11)) ? "DATA1" : "DATA0",
 140                types[(csr & 0x700) >> 8],
 141
 142                /* iff type is control then print current direction */
 143                (!(csr & 0x700))
 144                        ? ((csr & (1 << 7)) ? " IN" : " OUT")
 145                        : "",
 146                (csr & (1 << 6)) ? " rxdatabk1" : "",
 147                (csr & (1 << 5)) ? " forcestall" : "",
 148                (csr & (1 << 4)) ? " txpktrdy" : "",
 149
 150                (csr & (1 << 3)) ? " stallsent" : "",
 151                (csr & (1 << 2)) ? " rxsetup" : "",
 152                (csr & (1 << 1)) ? " rxdatabk0" : "",
 153                (csr & (1 << 0)) ? " txcomp" : "");
 154        if (list_empty (&ep->queue))
 155                seq_printf(s, "\t(queue empty)\n");
 156
 157        else list_for_each_entry (req, &ep->queue, queue) {
 158                unsigned        length = req->req.actual;
 159
 160                seq_printf(s, "\treq %p len %d/%d buf %p\n",
 161                                &req->req, length,
 162                                req->req.length, req->req.buf);
 163        }
 164        spin_unlock_irqrestore(&udc->lock, flags);
 165}
 166
 167static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
 168{
 169        int i;
 170
 171        seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
 172                (mask & (1 << 13)) ? " wakeup" : "",
 173                (mask & (1 << 12)) ? " endbusres" : "",
 174
 175                (mask & (1 << 11)) ? " sofint" : "",
 176                (mask & (1 << 10)) ? " extrsm" : "",
 177                (mask & (1 << 9)) ? " rxrsm" : "",
 178                (mask & (1 << 8)) ? " rxsusp" : "");
 179        for (i = 0; i < 8; i++) {
 180                if (mask & (1 << i))
 181                        seq_printf(s, " ep%d", i);
 182        }
 183        seq_printf(s, "\n");
 184}
 185
 186static int proc_udc_show(struct seq_file *s, void *unused)
 187{
 188        struct at91_udc *udc = s->private;
 189        struct at91_ep  *ep;
 190        u32             tmp;
 191
 192        seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
 193
 194        seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
 195                udc->vbus ? "present" : "off",
 196                udc->enabled
 197                        ? (udc->vbus ? "active" : "enabled")
 198                        : "disabled",
 199                udc->gadget.is_selfpowered ? "self" : "VBUS",
 200                udc->suspended ? ", suspended" : "",
 201                udc->driver ? udc->driver->driver.name : "(none)");
 202
 203        /* don't access registers when interface isn't clocked */
 204        if (!udc->clocked) {
 205                seq_printf(s, "(not clocked)\n");
 206                return 0;
 207        }
 208
 209        tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
 210        seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
 211                (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
 212                (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
 213                (tmp & AT91_UDP_NUM));
 214
 215        tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 216        seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
 217                (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
 218                (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
 219                (tmp & AT91_UDP_ESR) ? " esr" : "",
 220                (tmp & AT91_UDP_CONFG) ? " confg" : "",
 221                (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
 222
 223        tmp = at91_udp_read(udc, AT91_UDP_FADDR);
 224        seq_printf(s, "faddr   %03x:%s fadd=%d\n", tmp,
 225                (tmp & AT91_UDP_FEN) ? " fen" : "",
 226                (tmp & AT91_UDP_FADD));
 227
 228        proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
 229        proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
 230
 231        if (udc->enabled && udc->vbus) {
 232                proc_ep_show(s, &udc->ep[0]);
 233                list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
 234                        if (ep->ep.desc)
 235                                proc_ep_show(s, ep);
 236                }
 237        }
 238        return 0;
 239}
 240
 241static int proc_udc_open(struct inode *inode, struct file *file)
 242{
 243        return single_open(file, proc_udc_show, PDE_DATA(inode));
 244}
 245
 246static const struct file_operations proc_ops = {
 247        .owner          = THIS_MODULE,
 248        .open           = proc_udc_open,
 249        .read           = seq_read,
 250        .llseek         = seq_lseek,
 251        .release        = single_release,
 252};
 253
 254static void create_debug_file(struct at91_udc *udc)
 255{
 256        udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
 257}
 258
 259static void remove_debug_file(struct at91_udc *udc)
 260{
 261        if (udc->pde)
 262                remove_proc_entry(debug_filename, NULL);
 263}
 264
 265#else
 266
 267static inline void create_debug_file(struct at91_udc *udc) {}
 268static inline void remove_debug_file(struct at91_udc *udc) {}
 269
 270#endif
 271
 272
 273/*-------------------------------------------------------------------------*/
 274
 275static void done(struct at91_ep *ep, struct at91_request *req, int status)
 276{
 277        unsigned        stopped = ep->stopped;
 278        struct at91_udc *udc = ep->udc;
 279
 280        list_del_init(&req->queue);
 281        if (req->req.status == -EINPROGRESS)
 282                req->req.status = status;
 283        else
 284                status = req->req.status;
 285        if (status && status != -ESHUTDOWN)
 286                VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
 287
 288        ep->stopped = 1;
 289        spin_unlock(&udc->lock);
 290        usb_gadget_giveback_request(&ep->ep, &req->req);
 291        spin_lock(&udc->lock);
 292        ep->stopped = stopped;
 293
 294        /* ep0 is always ready; other endpoints need a non-empty queue */
 295        if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
 296                at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
 297}
 298
 299/*-------------------------------------------------------------------------*/
 300
 301/* bits indicating OUT fifo has data ready */
 302#define RX_DATA_READY   (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
 303
 304/*
 305 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 306 * back most of the value you just read (because of side effects, including
 307 * bits that may change after reading and before writing).
 308 *
 309 * Except when changing a specific bit, always write values which:
 310 *  - clear SET_FX bits (setting them could change something)
 311 *  - set CLR_FX bits (clearing them could change something)
 312 *
 313 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 314 * that shouldn't normally be changed.
 315 *
 316 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 317 * implying a need to wait for one write to complete (test relevant bits)
 318 * before starting the next write.  This shouldn't be an issue given how
 319 * infrequently we write, except maybe for write-then-read idioms.
 320 */
 321#define SET_FX  (AT91_UDP_TXPKTRDY)
 322#define CLR_FX  (RX_DATA_READY | AT91_UDP_RXSETUP \
 323                | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
 324
 325/* pull OUT packet data from the endpoint's fifo */
 326static int read_fifo (struct at91_ep *ep, struct at91_request *req)
 327{
 328        u32 __iomem     *creg = ep->creg;
 329        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 330        u32             csr;
 331        u8              *buf;
 332        unsigned int    count, bufferspace, is_done;
 333
 334        buf = req->req.buf + req->req.actual;
 335        bufferspace = req->req.length - req->req.actual;
 336
 337        /*
 338         * there might be nothing to read if ep_queue() calls us,
 339         * or if we already emptied both pingpong buffers
 340         */
 341rescan:
 342        csr = __raw_readl(creg);
 343        if ((csr & RX_DATA_READY) == 0)
 344                return 0;
 345
 346        count = (csr & AT91_UDP_RXBYTECNT) >> 16;
 347        if (count > ep->ep.maxpacket)
 348                count = ep->ep.maxpacket;
 349        if (count > bufferspace) {
 350                DBG("%s buffer overflow\n", ep->ep.name);
 351                req->req.status = -EOVERFLOW;
 352                count = bufferspace;
 353        }
 354        __raw_readsb(dreg, buf, count);
 355
 356        /* release and swap pingpong mem bank */
 357        csr |= CLR_FX;
 358        if (ep->is_pingpong) {
 359                if (ep->fifo_bank == 0) {
 360                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 361                        ep->fifo_bank = 1;
 362                } else {
 363                        csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
 364                        ep->fifo_bank = 0;
 365                }
 366        } else
 367                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 368        __raw_writel(csr, creg);
 369
 370        req->req.actual += count;
 371        is_done = (count < ep->ep.maxpacket);
 372        if (count == bufferspace)
 373                is_done = 1;
 374
 375        PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
 376                        is_done ? " (done)" : "");
 377
 378        /*
 379         * avoid extra trips through IRQ logic for packets already in
 380         * the fifo ... maybe preventing an extra (expensive) OUT-NAK
 381         */
 382        if (is_done)
 383                done(ep, req, 0);
 384        else if (ep->is_pingpong) {
 385                /*
 386                 * One dummy read to delay the code because of a HW glitch:
 387                 * CSR returns bad RXCOUNT when read too soon after updating
 388                 * RX_DATA_BK flags.
 389                 */
 390                csr = __raw_readl(creg);
 391
 392                bufferspace -= count;
 393                buf += count;
 394                goto rescan;
 395        }
 396
 397        return is_done;
 398}
 399
 400/* load fifo for an IN packet */
 401static int write_fifo(struct at91_ep *ep, struct at91_request *req)
 402{
 403        u32 __iomem     *creg = ep->creg;
 404        u32             csr = __raw_readl(creg);
 405        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 406        unsigned        total, count, is_last;
 407        u8              *buf;
 408
 409        /*
 410         * TODO: allow for writing two packets to the fifo ... that'll
 411         * reduce the amount of IN-NAKing, but probably won't affect
 412         * throughput much.  (Unlike preventing OUT-NAKing!)
 413         */
 414
 415        /*
 416         * If ep_queue() calls us, the queue is empty and possibly in
 417         * odd states like TXCOMP not yet cleared (we do it, saving at
 418         * least one IRQ) or the fifo not yet being free.  Those aren't
 419         * issues normally (IRQ handler fast path).
 420         */
 421        if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
 422                if (csr & AT91_UDP_TXCOMP) {
 423                        csr |= CLR_FX;
 424                        csr &= ~(SET_FX | AT91_UDP_TXCOMP);
 425                        __raw_writel(csr, creg);
 426                        csr = __raw_readl(creg);
 427                }
 428                if (csr & AT91_UDP_TXPKTRDY)
 429                        return 0;
 430        }
 431
 432        buf = req->req.buf + req->req.actual;
 433        prefetch(buf);
 434        total = req->req.length - req->req.actual;
 435        if (ep->ep.maxpacket < total) {
 436                count = ep->ep.maxpacket;
 437                is_last = 0;
 438        } else {
 439                count = total;
 440                is_last = (count < ep->ep.maxpacket) || !req->req.zero;
 441        }
 442
 443        /*
 444         * Write the packet, maybe it's a ZLP.
 445         *
 446         * NOTE:  incrementing req->actual before we receive the ACK means
 447         * gadget driver IN bytecounts can be wrong in fault cases.  That's
 448         * fixable with PIO drivers like this one (save "count" here, and
 449         * do the increment later on TX irq), but not for most DMA hardware.
 450         *
 451         * So all gadget drivers must accept that potential error.  Some
 452         * hardware supports precise fifo status reporting, letting them
 453         * recover when the actual bytecount matters (e.g. for USB Test
 454         * and Measurement Class devices).
 455         */
 456        __raw_writesb(dreg, buf, count);
 457        csr &= ~SET_FX;
 458        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
 459        __raw_writel(csr, creg);
 460        req->req.actual += count;
 461
 462        PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
 463                        is_last ? " (done)" : "");
 464        if (is_last)
 465                done(ep, req, 0);
 466        return is_last;
 467}
 468
 469static void nuke(struct at91_ep *ep, int status)
 470{
 471        struct at91_request *req;
 472
 473        /* terminate any request in the queue */
 474        ep->stopped = 1;
 475        if (list_empty(&ep->queue))
 476                return;
 477
 478        VDBG("%s %s\n", __func__, ep->ep.name);
 479        while (!list_empty(&ep->queue)) {
 480                req = list_entry(ep->queue.next, struct at91_request, queue);
 481                done(ep, req, status);
 482        }
 483}
 484
 485/*-------------------------------------------------------------------------*/
 486
 487static int at91_ep_enable(struct usb_ep *_ep,
 488                                const struct usb_endpoint_descriptor *desc)
 489{
 490        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 491        struct at91_udc *udc;
 492        u16             maxpacket;
 493        u32             tmp;
 494        unsigned long   flags;
 495
 496        if (!_ep || !ep
 497                        || !desc || _ep->name == ep0name
 498                        || desc->bDescriptorType != USB_DT_ENDPOINT
 499                        || (maxpacket = usb_endpoint_maxp(desc)) == 0
 500                        || maxpacket > ep->maxpacket) {
 501                DBG("bad ep or descriptor\n");
 502                return -EINVAL;
 503        }
 504
 505        udc = ep->udc;
 506        if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 507                DBG("bogus device state\n");
 508                return -ESHUTDOWN;
 509        }
 510
 511        tmp = usb_endpoint_type(desc);
 512        switch (tmp) {
 513        case USB_ENDPOINT_XFER_CONTROL:
 514                DBG("only one control endpoint\n");
 515                return -EINVAL;
 516        case USB_ENDPOINT_XFER_INT:
 517                if (maxpacket > 64)
 518                        goto bogus_max;
 519                break;
 520        case USB_ENDPOINT_XFER_BULK:
 521                switch (maxpacket) {
 522                case 8:
 523                case 16:
 524                case 32:
 525                case 64:
 526                        goto ok;
 527                }
 528bogus_max:
 529                DBG("bogus maxpacket %d\n", maxpacket);
 530                return -EINVAL;
 531        case USB_ENDPOINT_XFER_ISOC:
 532                if (!ep->is_pingpong) {
 533                        DBG("iso requires double buffering\n");
 534                        return -EINVAL;
 535                }
 536                break;
 537        }
 538
 539ok:
 540        spin_lock_irqsave(&udc->lock, flags);
 541
 542        /* initialize endpoint to match this descriptor */
 543        ep->is_in = usb_endpoint_dir_in(desc);
 544        ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
 545        ep->stopped = 0;
 546        if (ep->is_in)
 547                tmp |= 0x04;
 548        tmp <<= 8;
 549        tmp |= AT91_UDP_EPEDS;
 550        __raw_writel(tmp, ep->creg);
 551
 552        ep->ep.maxpacket = maxpacket;
 553
 554        /*
 555         * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
 556         * since endpoint resets don't reset hw pingpong state.
 557         */
 558        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 559        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 560
 561        spin_unlock_irqrestore(&udc->lock, flags);
 562        return 0;
 563}
 564
 565static int at91_ep_disable (struct usb_ep * _ep)
 566{
 567        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 568        struct at91_udc *udc = ep->udc;
 569        unsigned long   flags;
 570
 571        if (ep == &ep->udc->ep[0])
 572                return -EINVAL;
 573
 574        spin_lock_irqsave(&udc->lock, flags);
 575
 576        nuke(ep, -ESHUTDOWN);
 577
 578        /* restore the endpoint's pristine config */
 579        ep->ep.desc = NULL;
 580        ep->ep.maxpacket = ep->maxpacket;
 581
 582        /* reset fifos and endpoint */
 583        if (ep->udc->clocked) {
 584                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 585                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 586                __raw_writel(0, ep->creg);
 587        }
 588
 589        spin_unlock_irqrestore(&udc->lock, flags);
 590        return 0;
 591}
 592
 593/*
 594 * this is a PIO-only driver, so there's nothing
 595 * interesting for request or buffer allocation.
 596 */
 597
 598static struct usb_request *
 599at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 600{
 601        struct at91_request *req;
 602
 603        req = kzalloc(sizeof (struct at91_request), gfp_flags);
 604        if (!req)
 605                return NULL;
 606
 607        INIT_LIST_HEAD(&req->queue);
 608        return &req->req;
 609}
 610
 611static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 612{
 613        struct at91_request *req;
 614
 615        req = container_of(_req, struct at91_request, req);
 616        BUG_ON(!list_empty(&req->queue));
 617        kfree(req);
 618}
 619
 620static int at91_ep_queue(struct usb_ep *_ep,
 621                        struct usb_request *_req, gfp_t gfp_flags)
 622{
 623        struct at91_request     *req;
 624        struct at91_ep          *ep;
 625        struct at91_udc         *udc;
 626        int                     status;
 627        unsigned long           flags;
 628
 629        req = container_of(_req, struct at91_request, req);
 630        ep = container_of(_ep, struct at91_ep, ep);
 631
 632        if (!_req || !_req->complete
 633                        || !_req->buf || !list_empty(&req->queue)) {
 634                DBG("invalid request\n");
 635                return -EINVAL;
 636        }
 637
 638        if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
 639                DBG("invalid ep\n");
 640                return -EINVAL;
 641        }
 642
 643        udc = ep->udc;
 644
 645        if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 646                DBG("invalid device\n");
 647                return -EINVAL;
 648        }
 649
 650        _req->status = -EINPROGRESS;
 651        _req->actual = 0;
 652
 653        spin_lock_irqsave(&udc->lock, flags);
 654
 655        /* try to kickstart any empty and idle queue */
 656        if (list_empty(&ep->queue) && !ep->stopped) {
 657                int     is_ep0;
 658
 659                /*
 660                 * If this control request has a non-empty DATA stage, this
 661                 * will start that stage.  It works just like a non-control
 662                 * request (until the status stage starts, maybe early).
 663                 *
 664                 * If the data stage is empty, then this starts a successful
 665                 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
 666                 */
 667                is_ep0 = (ep->ep.name == ep0name);
 668                if (is_ep0) {
 669                        u32     tmp;
 670
 671                        if (!udc->req_pending) {
 672                                status = -EINVAL;
 673                                goto done;
 674                        }
 675
 676                        /*
 677                         * defer changing CONFG until after the gadget driver
 678                         * reconfigures the endpoints.
 679                         */
 680                        if (udc->wait_for_config_ack) {
 681                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 682                                tmp ^= AT91_UDP_CONFG;
 683                                VDBG("toggle config\n");
 684                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 685                        }
 686                        if (req->req.length == 0) {
 687ep0_in_status:
 688                                PACKET("ep0 in/status\n");
 689                                status = 0;
 690                                tmp = __raw_readl(ep->creg);
 691                                tmp &= ~SET_FX;
 692                                tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
 693                                __raw_writel(tmp, ep->creg);
 694                                udc->req_pending = 0;
 695                                goto done;
 696                        }
 697                }
 698
 699                if (ep->is_in)
 700                        status = write_fifo(ep, req);
 701                else {
 702                        status = read_fifo(ep, req);
 703
 704                        /* IN/STATUS stage is otherwise triggered by irq */
 705                        if (status && is_ep0)
 706                                goto ep0_in_status;
 707                }
 708        } else
 709                status = 0;
 710
 711        if (req && !status) {
 712                list_add_tail (&req->queue, &ep->queue);
 713                at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
 714        }
 715done:
 716        spin_unlock_irqrestore(&udc->lock, flags);
 717        return (status < 0) ? status : 0;
 718}
 719
 720static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 721{
 722        struct at91_ep          *ep;
 723        struct at91_request     *req;
 724        unsigned long           flags;
 725        struct at91_udc         *udc;
 726
 727        ep = container_of(_ep, struct at91_ep, ep);
 728        if (!_ep || ep->ep.name == ep0name)
 729                return -EINVAL;
 730
 731        udc = ep->udc;
 732
 733        spin_lock_irqsave(&udc->lock, flags);
 734
 735        /* make sure it's actually queued on this endpoint */
 736        list_for_each_entry (req, &ep->queue, queue) {
 737                if (&req->req == _req)
 738                        break;
 739        }
 740        if (&req->req != _req) {
 741                spin_unlock_irqrestore(&udc->lock, flags);
 742                return -EINVAL;
 743        }
 744
 745        done(ep, req, -ECONNRESET);
 746        spin_unlock_irqrestore(&udc->lock, flags);
 747        return 0;
 748}
 749
 750static int at91_ep_set_halt(struct usb_ep *_ep, int value)
 751{
 752        struct at91_ep  *ep = container_of(_ep, struct at91_ep, ep);
 753        struct at91_udc *udc = ep->udc;
 754        u32 __iomem     *creg;
 755        u32             csr;
 756        unsigned long   flags;
 757        int             status = 0;
 758
 759        if (!_ep || ep->is_iso || !ep->udc->clocked)
 760                return -EINVAL;
 761
 762        creg = ep->creg;
 763        spin_lock_irqsave(&udc->lock, flags);
 764
 765        csr = __raw_readl(creg);
 766
 767        /*
 768         * fail with still-busy IN endpoints, ensuring correct sequencing
 769         * of data tx then stall.  note that the fifo rx bytecount isn't
 770         * completely accurate as a tx bytecount.
 771         */
 772        if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
 773                status = -EAGAIN;
 774        else {
 775                csr |= CLR_FX;
 776                csr &= ~SET_FX;
 777                if (value) {
 778                        csr |= AT91_UDP_FORCESTALL;
 779                        VDBG("halt %s\n", ep->ep.name);
 780                } else {
 781                        at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 782                        at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 783                        csr &= ~AT91_UDP_FORCESTALL;
 784                }
 785                __raw_writel(csr, creg);
 786        }
 787
 788        spin_unlock_irqrestore(&udc->lock, flags);
 789        return status;
 790}
 791
 792static const struct usb_ep_ops at91_ep_ops = {
 793        .enable         = at91_ep_enable,
 794        .disable        = at91_ep_disable,
 795        .alloc_request  = at91_ep_alloc_request,
 796        .free_request   = at91_ep_free_request,
 797        .queue          = at91_ep_queue,
 798        .dequeue        = at91_ep_dequeue,
 799        .set_halt       = at91_ep_set_halt,
 800        /* there's only imprecise fifo status reporting */
 801};
 802
 803/*-------------------------------------------------------------------------*/
 804
 805static int at91_get_frame(struct usb_gadget *gadget)
 806{
 807        struct at91_udc *udc = to_udc(gadget);
 808
 809        if (!to_udc(gadget)->clocked)
 810                return -EINVAL;
 811        return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
 812}
 813
 814static int at91_wakeup(struct usb_gadget *gadget)
 815{
 816        struct at91_udc *udc = to_udc(gadget);
 817        u32             glbstate;
 818        int             status = -EINVAL;
 819        unsigned long   flags;
 820
 821        DBG("%s\n", __func__ );
 822        spin_lock_irqsave(&udc->lock, flags);
 823
 824        if (!udc->clocked || !udc->suspended)
 825                goto done;
 826
 827        /* NOTE:  some "early versions" handle ESR differently ... */
 828
 829        glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 830        if (!(glbstate & AT91_UDP_ESR))
 831                goto done;
 832        glbstate |= AT91_UDP_ESR;
 833        at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
 834
 835done:
 836        spin_unlock_irqrestore(&udc->lock, flags);
 837        return status;
 838}
 839
 840/* reinit == restore initial software state */
 841static void udc_reinit(struct at91_udc *udc)
 842{
 843        u32 i;
 844
 845        INIT_LIST_HEAD(&udc->gadget.ep_list);
 846        INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
 847        udc->gadget.quirk_stall_not_supp = 1;
 848
 849        for (i = 0; i < NUM_ENDPOINTS; i++) {
 850                struct at91_ep *ep = &udc->ep[i];
 851
 852                if (i != 0)
 853                        list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 854                ep->ep.desc = NULL;
 855                ep->stopped = 0;
 856                ep->fifo_bank = 0;
 857                usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
 858                ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
 859                /* initialize one queue per endpoint */
 860                INIT_LIST_HEAD(&ep->queue);
 861        }
 862}
 863
 864static void reset_gadget(struct at91_udc *udc)
 865{
 866        struct usb_gadget_driver *driver = udc->driver;
 867        int i;
 868
 869        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 870                driver = NULL;
 871        udc->gadget.speed = USB_SPEED_UNKNOWN;
 872        udc->suspended = 0;
 873
 874        for (i = 0; i < NUM_ENDPOINTS; i++) {
 875                struct at91_ep *ep = &udc->ep[i];
 876
 877                ep->stopped = 1;
 878                nuke(ep, -ESHUTDOWN);
 879        }
 880        if (driver) {
 881                spin_unlock(&udc->lock);
 882                usb_gadget_udc_reset(&udc->gadget, driver);
 883                spin_lock(&udc->lock);
 884        }
 885
 886        udc_reinit(udc);
 887}
 888
 889static void stop_activity(struct at91_udc *udc)
 890{
 891        struct usb_gadget_driver *driver = udc->driver;
 892        int i;
 893
 894        if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 895                driver = NULL;
 896        udc->gadget.speed = USB_SPEED_UNKNOWN;
 897        udc->suspended = 0;
 898
 899        for (i = 0; i < NUM_ENDPOINTS; i++) {
 900                struct at91_ep *ep = &udc->ep[i];
 901                ep->stopped = 1;
 902                nuke(ep, -ESHUTDOWN);
 903        }
 904        if (driver) {
 905                spin_unlock(&udc->lock);
 906                driver->disconnect(&udc->gadget);
 907                spin_lock(&udc->lock);
 908        }
 909
 910        udc_reinit(udc);
 911}
 912
 913static void clk_on(struct at91_udc *udc)
 914{
 915        if (udc->clocked)
 916                return;
 917        udc->clocked = 1;
 918
 919        clk_enable(udc->iclk);
 920        clk_enable(udc->fclk);
 921}
 922
 923static void clk_off(struct at91_udc *udc)
 924{
 925        if (!udc->clocked)
 926                return;
 927        udc->clocked = 0;
 928        udc->gadget.speed = USB_SPEED_UNKNOWN;
 929        clk_disable(udc->fclk);
 930        clk_disable(udc->iclk);
 931}
 932
 933/*
 934 * activate/deactivate link with host; minimize power usage for
 935 * inactive links by cutting clocks and transceiver power.
 936 */
 937static void pullup(struct at91_udc *udc, int is_on)
 938{
 939        if (!udc->enabled || !udc->vbus)
 940                is_on = 0;
 941        DBG("%sactive\n", is_on ? "" : "in");
 942
 943        if (is_on) {
 944                clk_on(udc);
 945                at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
 946                at91_udp_write(udc, AT91_UDP_TXVC, 0);
 947        } else {
 948                stop_activity(udc);
 949                at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
 950                at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
 951                clk_off(udc);
 952        }
 953
 954        if (udc->caps && udc->caps->pullup)
 955                udc->caps->pullup(udc, is_on);
 956}
 957
 958/* vbus is here!  turn everything on that's ready */
 959static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
 960{
 961        struct at91_udc *udc = to_udc(gadget);
 962        unsigned long   flags;
 963
 964        /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
 965        spin_lock_irqsave(&udc->lock, flags);
 966        udc->vbus = (is_active != 0);
 967        if (udc->driver)
 968                pullup(udc, is_active);
 969        else
 970                pullup(udc, 0);
 971        spin_unlock_irqrestore(&udc->lock, flags);
 972        return 0;
 973}
 974
 975static int at91_pullup(struct usb_gadget *gadget, int is_on)
 976{
 977        struct at91_udc *udc = to_udc(gadget);
 978        unsigned long   flags;
 979
 980        spin_lock_irqsave(&udc->lock, flags);
 981        udc->enabled = is_on = !!is_on;
 982        pullup(udc, is_on);
 983        spin_unlock_irqrestore(&udc->lock, flags);
 984        return 0;
 985}
 986
 987static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
 988{
 989        struct at91_udc *udc = to_udc(gadget);
 990        unsigned long   flags;
 991
 992        spin_lock_irqsave(&udc->lock, flags);
 993        gadget->is_selfpowered = (is_on != 0);
 994        spin_unlock_irqrestore(&udc->lock, flags);
 995        return 0;
 996}
 997
 998static int at91_start(struct usb_gadget *gadget,
 999                struct usb_gadget_driver *driver);
1000static int at91_stop(struct usb_gadget *gadget);
1001
1002static const struct usb_gadget_ops at91_udc_ops = {
1003        .get_frame              = at91_get_frame,
1004        .wakeup                 = at91_wakeup,
1005        .set_selfpowered        = at91_set_selfpowered,
1006        .vbus_session           = at91_vbus_session,
1007        .pullup                 = at91_pullup,
1008        .udc_start              = at91_start,
1009        .udc_stop               = at91_stop,
1010
1011        /*
1012         * VBUS-powered devices may also also want to support bigger
1013         * power budgets after an appropriate SET_CONFIGURATION.
1014         */
1015        /* .vbus_power          = at91_vbus_power, */
1016};
1017
1018/*-------------------------------------------------------------------------*/
1019
1020static int handle_ep(struct at91_ep *ep)
1021{
1022        struct at91_request     *req;
1023        u32 __iomem             *creg = ep->creg;
1024        u32                     csr = __raw_readl(creg);
1025
1026        if (!list_empty(&ep->queue))
1027                req = list_entry(ep->queue.next,
1028                        struct at91_request, queue);
1029        else
1030                req = NULL;
1031
1032        if (ep->is_in) {
1033                if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1034                        csr |= CLR_FX;
1035                        csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1036                        __raw_writel(csr, creg);
1037                }
1038                if (req)
1039                        return write_fifo(ep, req);
1040
1041        } else {
1042                if (csr & AT91_UDP_STALLSENT) {
1043                        /* STALLSENT bit == ISOERR */
1044                        if (ep->is_iso && req)
1045                                req->req.status = -EILSEQ;
1046                        csr |= CLR_FX;
1047                        csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1048                        __raw_writel(csr, creg);
1049                        csr = __raw_readl(creg);
1050                }
1051                if (req && (csr & RX_DATA_READY))
1052                        return read_fifo(ep, req);
1053        }
1054        return 0;
1055}
1056
1057union setup {
1058        u8                      raw[8];
1059        struct usb_ctrlrequest  r;
1060};
1061
1062static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1063{
1064        u32 __iomem     *creg = ep->creg;
1065        u8 __iomem      *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1066        unsigned        rxcount, i = 0;
1067        u32             tmp;
1068        union setup     pkt;
1069        int             status = 0;
1070
1071        /* read and ack SETUP; hard-fail for bogus packets */
1072        rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1073        if (likely(rxcount == 8)) {
1074                while (rxcount--)
1075                        pkt.raw[i++] = __raw_readb(dreg);
1076                if (pkt.r.bRequestType & USB_DIR_IN) {
1077                        csr |= AT91_UDP_DIR;
1078                        ep->is_in = 1;
1079                } else {
1080                        csr &= ~AT91_UDP_DIR;
1081                        ep->is_in = 0;
1082                }
1083        } else {
1084                /* REVISIT this happens sometimes under load; why?? */
1085                ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1086                status = -EINVAL;
1087        }
1088        csr |= CLR_FX;
1089        csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1090        __raw_writel(csr, creg);
1091        udc->wait_for_addr_ack = 0;
1092        udc->wait_for_config_ack = 0;
1093        ep->stopped = 0;
1094        if (unlikely(status != 0))
1095                goto stall;
1096
1097#define w_index         le16_to_cpu(pkt.r.wIndex)
1098#define w_value         le16_to_cpu(pkt.r.wValue)
1099#define w_length        le16_to_cpu(pkt.r.wLength)
1100
1101        VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1102                        pkt.r.bRequestType, pkt.r.bRequest,
1103                        w_value, w_index, w_length);
1104
1105        /*
1106         * A few standard requests get handled here, ones that touch
1107         * hardware ... notably for device and endpoint features.
1108         */
1109        udc->req_pending = 1;
1110        csr = __raw_readl(creg);
1111        csr |= CLR_FX;
1112        csr &= ~SET_FX;
1113        switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1114
1115        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1116                        | USB_REQ_SET_ADDRESS:
1117                __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1118                udc->addr = w_value;
1119                udc->wait_for_addr_ack = 1;
1120                udc->req_pending = 0;
1121                /* FADDR is set later, when we ack host STATUS */
1122                return;
1123
1124        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1125                        | USB_REQ_SET_CONFIGURATION:
1126                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1127                if (pkt.r.wValue)
1128                        udc->wait_for_config_ack = (tmp == 0);
1129                else
1130                        udc->wait_for_config_ack = (tmp != 0);
1131                if (udc->wait_for_config_ack)
1132                        VDBG("wait for config\n");
1133                /* CONFG is toggled later, if gadget driver succeeds */
1134                break;
1135
1136        /*
1137         * Hosts may set or clear remote wakeup status, and
1138         * devices may report they're VBUS powered.
1139         */
1140        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1141                        | USB_REQ_GET_STATUS:
1142                tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1143                if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1144                        tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1145                PACKET("get device status\n");
1146                __raw_writeb(tmp, dreg);
1147                __raw_writeb(0, dreg);
1148                goto write_in;
1149                /* then STATUS starts later, automatically */
1150        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1151                        | USB_REQ_SET_FEATURE:
1152                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1153                        goto stall;
1154                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1155                tmp |= AT91_UDP_ESR;
1156                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1157                goto succeed;
1158        case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1159                        | USB_REQ_CLEAR_FEATURE:
1160                if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1161                        goto stall;
1162                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1163                tmp &= ~AT91_UDP_ESR;
1164                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1165                goto succeed;
1166
1167        /*
1168         * Interfaces have no feature settings; this is pretty useless.
1169         * we won't even insist the interface exists...
1170         */
1171        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1172                        | USB_REQ_GET_STATUS:
1173                PACKET("get interface status\n");
1174                __raw_writeb(0, dreg);
1175                __raw_writeb(0, dreg);
1176                goto write_in;
1177                /* then STATUS starts later, automatically */
1178        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1179                        | USB_REQ_SET_FEATURE:
1180        case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1181                        | USB_REQ_CLEAR_FEATURE:
1182                goto stall;
1183
1184        /*
1185         * Hosts may clear bulk/intr endpoint halt after the gadget
1186         * driver sets it (not widely used); or set it (for testing)
1187         */
1188        case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1189                        | USB_REQ_GET_STATUS:
1190                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1191                ep = &udc->ep[tmp];
1192                if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1193                        goto stall;
1194
1195                if (tmp) {
1196                        if ((w_index & USB_DIR_IN)) {
1197                                if (!ep->is_in)
1198                                        goto stall;
1199                        } else if (ep->is_in)
1200                                goto stall;
1201                }
1202                PACKET("get %s status\n", ep->ep.name);
1203                if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1204                        tmp = (1 << USB_ENDPOINT_HALT);
1205                else
1206                        tmp = 0;
1207                __raw_writeb(tmp, dreg);
1208                __raw_writeb(0, dreg);
1209                goto write_in;
1210                /* then STATUS starts later, automatically */
1211        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1212                        | USB_REQ_SET_FEATURE:
1213                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1214                ep = &udc->ep[tmp];
1215                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1216                        goto stall;
1217                if (!ep->ep.desc || ep->is_iso)
1218                        goto stall;
1219                if ((w_index & USB_DIR_IN)) {
1220                        if (!ep->is_in)
1221                                goto stall;
1222                } else if (ep->is_in)
1223                        goto stall;
1224
1225                tmp = __raw_readl(ep->creg);
1226                tmp &= ~SET_FX;
1227                tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1228                __raw_writel(tmp, ep->creg);
1229                goto succeed;
1230        case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1231                        | USB_REQ_CLEAR_FEATURE:
1232                tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1233                ep = &udc->ep[tmp];
1234                if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1235                        goto stall;
1236                if (tmp == 0)
1237                        goto succeed;
1238                if (!ep->ep.desc || ep->is_iso)
1239                        goto stall;
1240                if ((w_index & USB_DIR_IN)) {
1241                        if (!ep->is_in)
1242                                goto stall;
1243                } else if (ep->is_in)
1244                        goto stall;
1245
1246                at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1247                at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1248                tmp = __raw_readl(ep->creg);
1249                tmp |= CLR_FX;
1250                tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1251                __raw_writel(tmp, ep->creg);
1252                if (!list_empty(&ep->queue))
1253                        handle_ep(ep);
1254                goto succeed;
1255        }
1256
1257#undef w_value
1258#undef w_index
1259#undef w_length
1260
1261        /* pass request up to the gadget driver */
1262        if (udc->driver) {
1263                spin_unlock(&udc->lock);
1264                status = udc->driver->setup(&udc->gadget, &pkt.r);
1265                spin_lock(&udc->lock);
1266        }
1267        else
1268                status = -ENODEV;
1269        if (status < 0) {
1270stall:
1271                VDBG("req %02x.%02x protocol STALL; stat %d\n",
1272                                pkt.r.bRequestType, pkt.r.bRequest, status);
1273                csr |= AT91_UDP_FORCESTALL;
1274                __raw_writel(csr, creg);
1275                udc->req_pending = 0;
1276        }
1277        return;
1278
1279succeed:
1280        /* immediate successful (IN) STATUS after zero length DATA */
1281        PACKET("ep0 in/status\n");
1282write_in:
1283        csr |= AT91_UDP_TXPKTRDY;
1284        __raw_writel(csr, creg);
1285        udc->req_pending = 0;
1286}
1287
1288static void handle_ep0(struct at91_udc *udc)
1289{
1290        struct at91_ep          *ep0 = &udc->ep[0];
1291        u32 __iomem             *creg = ep0->creg;
1292        u32                     csr = __raw_readl(creg);
1293        struct at91_request     *req;
1294
1295        if (unlikely(csr & AT91_UDP_STALLSENT)) {
1296                nuke(ep0, -EPROTO);
1297                udc->req_pending = 0;
1298                csr |= CLR_FX;
1299                csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1300                __raw_writel(csr, creg);
1301                VDBG("ep0 stalled\n");
1302                csr = __raw_readl(creg);
1303        }
1304        if (csr & AT91_UDP_RXSETUP) {
1305                nuke(ep0, 0);
1306                udc->req_pending = 0;
1307                handle_setup(udc, ep0, csr);
1308                return;
1309        }
1310
1311        if (list_empty(&ep0->queue))
1312                req = NULL;
1313        else
1314                req = list_entry(ep0->queue.next, struct at91_request, queue);
1315
1316        /* host ACKed an IN packet that we sent */
1317        if (csr & AT91_UDP_TXCOMP) {
1318                csr |= CLR_FX;
1319                csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1320
1321                /* write more IN DATA? */
1322                if (req && ep0->is_in) {
1323                        if (handle_ep(ep0))
1324                                udc->req_pending = 0;
1325
1326                /*
1327                 * Ack after:
1328                 *  - last IN DATA packet (including GET_STATUS)
1329                 *  - IN/STATUS for OUT DATA
1330                 *  - IN/STATUS for any zero-length DATA stage
1331                 * except for the IN DATA case, the host should send
1332                 * an OUT status later, which we'll ack.
1333                 */
1334                } else {
1335                        udc->req_pending = 0;
1336                        __raw_writel(csr, creg);
1337
1338                        /*
1339                         * SET_ADDRESS takes effect only after the STATUS
1340                         * (to the original address) gets acked.
1341                         */
1342                        if (udc->wait_for_addr_ack) {
1343                                u32     tmp;
1344
1345                                at91_udp_write(udc, AT91_UDP_FADDR,
1346                                                AT91_UDP_FEN | udc->addr);
1347                                tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1348                                tmp &= ~AT91_UDP_FADDEN;
1349                                if (udc->addr)
1350                                        tmp |= AT91_UDP_FADDEN;
1351                                at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1352
1353                                udc->wait_for_addr_ack = 0;
1354                                VDBG("address %d\n", udc->addr);
1355                        }
1356                }
1357        }
1358
1359        /* OUT packet arrived ... */
1360        else if (csr & AT91_UDP_RX_DATA_BK0) {
1361                csr |= CLR_FX;
1362                csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1363
1364                /* OUT DATA stage */
1365                if (!ep0->is_in) {
1366                        if (req) {
1367                                if (handle_ep(ep0)) {
1368                                        /* send IN/STATUS */
1369                                        PACKET("ep0 in/status\n");
1370                                        csr = __raw_readl(creg);
1371                                        csr &= ~SET_FX;
1372                                        csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1373                                        __raw_writel(csr, creg);
1374                                        udc->req_pending = 0;
1375                                }
1376                        } else if (udc->req_pending) {
1377                                /*
1378                                 * AT91 hardware has a hard time with this
1379                                 * "deferred response" mode for control-OUT
1380                                 * transfers.  (For control-IN it's fine.)
1381                                 *
1382                                 * The normal solution leaves OUT data in the
1383                                 * fifo until the gadget driver is ready.
1384                                 * We couldn't do that here without disabling
1385                                 * the IRQ that tells about SETUP packets,
1386                                 * e.g. when the host gets impatient...
1387                                 *
1388                                 * Working around it by copying into a buffer
1389                                 * would almost be a non-deferred response,
1390                                 * except that it wouldn't permit reliable
1391                                 * stalling of the request.  Instead, demand
1392                                 * that gadget drivers not use this mode.
1393                                 */
1394                                DBG("no control-OUT deferred responses!\n");
1395                                __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1396                                udc->req_pending = 0;
1397                        }
1398
1399                /* STATUS stage for control-IN; ack.  */
1400                } else {
1401                        PACKET("ep0 out/status ACK\n");
1402                        __raw_writel(csr, creg);
1403
1404                        /* "early" status stage */
1405                        if (req)
1406                                done(ep0, req, 0);
1407                }
1408        }
1409}
1410
1411static irqreturn_t at91_udc_irq (int irq, void *_udc)
1412{
1413        struct at91_udc         *udc = _udc;
1414        u32                     rescans = 5;
1415        int                     disable_clock = 0;
1416        unsigned long           flags;
1417
1418        spin_lock_irqsave(&udc->lock, flags);
1419
1420        if (!udc->clocked) {
1421                clk_on(udc);
1422                disable_clock = 1;
1423        }
1424
1425        while (rescans--) {
1426                u32 status;
1427
1428                status = at91_udp_read(udc, AT91_UDP_ISR)
1429                        & at91_udp_read(udc, AT91_UDP_IMR);
1430                if (!status)
1431                        break;
1432
1433                /* USB reset irq:  not maskable */
1434                if (status & AT91_UDP_ENDBUSRES) {
1435                        at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1436                        at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1437                        /* Atmel code clears this irq twice */
1438                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1439                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1440                        VDBG("end bus reset\n");
1441                        udc->addr = 0;
1442                        reset_gadget(udc);
1443
1444                        /* enable ep0 */
1445                        at91_udp_write(udc, AT91_UDP_CSR(0),
1446                                        AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1447                        udc->gadget.speed = USB_SPEED_FULL;
1448                        udc->suspended = 0;
1449                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1450
1451                        /*
1452                         * NOTE:  this driver keeps clocks off unless the
1453                         * USB host is present.  That saves power, but for
1454                         * boards that don't support VBUS detection, both
1455                         * clocks need to be active most of the time.
1456                         */
1457
1458                /* host initiated suspend (3+ms bus idle) */
1459                } else if (status & AT91_UDP_RXSUSP) {
1460                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1461                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1462                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1463                        /* VDBG("bus suspend\n"); */
1464                        if (udc->suspended)
1465                                continue;
1466                        udc->suspended = 1;
1467
1468                        /*
1469                         * NOTE:  when suspending a VBUS-powered device, the
1470                         * gadget driver should switch into slow clock mode
1471                         * and then into standby to avoid drawing more than
1472                         * 500uA power (2500uA for some high-power configs).
1473                         */
1474                        if (udc->driver && udc->driver->suspend) {
1475                                spin_unlock(&udc->lock);
1476                                udc->driver->suspend(&udc->gadget);
1477                                spin_lock(&udc->lock);
1478                        }
1479
1480                /* host initiated resume */
1481                } else if (status & AT91_UDP_RXRSM) {
1482                        at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1483                        at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1484                        at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1485                        /* VDBG("bus resume\n"); */
1486                        if (!udc->suspended)
1487                                continue;
1488                        udc->suspended = 0;
1489
1490                        /*
1491                         * NOTE:  for a VBUS-powered device, the gadget driver
1492                         * would normally want to switch out of slow clock
1493                         * mode into normal mode.
1494                         */
1495                        if (udc->driver && udc->driver->resume) {
1496                                spin_unlock(&udc->lock);
1497                                udc->driver->resume(&udc->gadget);
1498                                spin_lock(&udc->lock);
1499                        }
1500
1501                /* endpoint IRQs are cleared by handling them */
1502                } else {
1503                        int             i;
1504                        unsigned        mask = 1;
1505                        struct at91_ep  *ep = &udc->ep[1];
1506
1507                        if (status & mask)
1508                                handle_ep0(udc);
1509                        for (i = 1; i < NUM_ENDPOINTS; i++) {
1510                                mask <<= 1;
1511                                if (status & mask)
1512                                        handle_ep(ep);
1513                                ep++;
1514                        }
1515                }
1516        }
1517
1518        if (disable_clock)
1519                clk_off(udc);
1520
1521        spin_unlock_irqrestore(&udc->lock, flags);
1522
1523        return IRQ_HANDLED;
1524}
1525
1526/*-------------------------------------------------------------------------*/
1527
1528static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1529{
1530        value ^= udc->board.vbus_active_low;
1531        if (value != udc->vbus)
1532                at91_vbus_session(&udc->gadget, value);
1533}
1534
1535static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1536{
1537        struct at91_udc *udc = _udc;
1538
1539        /* vbus needs at least brief debouncing */
1540        udelay(10);
1541        at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1542
1543        return IRQ_HANDLED;
1544}
1545
1546static void at91_vbus_timer_work(struct work_struct *work)
1547{
1548        struct at91_udc *udc = container_of(work, struct at91_udc,
1549                                            vbus_timer_work);
1550
1551        at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1552
1553        if (!timer_pending(&udc->vbus_timer))
1554                mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1555}
1556
1557static void at91_vbus_timer(unsigned long data)
1558{
1559        struct at91_udc *udc = (struct at91_udc *)data;
1560
1561        /*
1562         * If we are polling vbus it is likely that the gpio is on an
1563         * bus such as i2c or spi which may sleep, so schedule some work
1564         * to read the vbus gpio
1565         */
1566        schedule_work(&udc->vbus_timer_work);
1567}
1568
1569static int at91_start(struct usb_gadget *gadget,
1570                struct usb_gadget_driver *driver)
1571{
1572        struct at91_udc *udc;
1573
1574        udc = container_of(gadget, struct at91_udc, gadget);
1575        udc->driver = driver;
1576        udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1577        udc->enabled = 1;
1578        udc->gadget.is_selfpowered = 1;
1579
1580        return 0;
1581}
1582
1583static int at91_stop(struct usb_gadget *gadget)
1584{
1585        struct at91_udc *udc;
1586        unsigned long   flags;
1587
1588        udc = container_of(gadget, struct at91_udc, gadget);
1589        spin_lock_irqsave(&udc->lock, flags);
1590        udc->enabled = 0;
1591        at91_udp_write(udc, AT91_UDP_IDR, ~0);
1592        spin_unlock_irqrestore(&udc->lock, flags);
1593
1594        udc->driver = NULL;
1595
1596        return 0;
1597}
1598
1599/*-------------------------------------------------------------------------*/
1600
1601static void at91udc_shutdown(struct platform_device *dev)
1602{
1603        struct at91_udc *udc = platform_get_drvdata(dev);
1604        unsigned long   flags;
1605
1606        /* force disconnect on reboot */
1607        spin_lock_irqsave(&udc->lock, flags);
1608        pullup(platform_get_drvdata(dev), 0);
1609        spin_unlock_irqrestore(&udc->lock, flags);
1610}
1611
1612static int at91rm9200_udc_init(struct at91_udc *udc)
1613{
1614        struct at91_ep *ep;
1615        int ret;
1616        int i;
1617
1618        for (i = 0; i < NUM_ENDPOINTS; i++) {
1619                ep = &udc->ep[i];
1620
1621                switch (i) {
1622                case 0:
1623                case 3:
1624                        ep->maxpacket = 8;
1625                        break;
1626                case 1 ... 2:
1627                        ep->maxpacket = 64;
1628                        break;
1629                case 4 ... 5:
1630                        ep->maxpacket = 256;
1631                        break;
1632                }
1633        }
1634
1635        if (!gpio_is_valid(udc->board.pullup_pin)) {
1636                DBG("no D+ pullup?\n");
1637                return -ENODEV;
1638        }
1639
1640        ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
1641                                "udc_pullup");
1642        if (ret) {
1643                DBG("D+ pullup is busy\n");
1644                return ret;
1645        }
1646
1647        gpio_direction_output(udc->board.pullup_pin,
1648                              udc->board.pullup_active_low);
1649
1650        return 0;
1651}
1652
1653static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1654{
1655        int active = !udc->board.pullup_active_low;
1656
1657        if (is_on)
1658                gpio_set_value(udc->board.pullup_pin, active);
1659        else
1660                gpio_set_value(udc->board.pullup_pin, !active);
1661}
1662
1663static const struct at91_udc_caps at91rm9200_udc_caps = {
1664        .init = at91rm9200_udc_init,
1665        .pullup = at91rm9200_udc_pullup,
1666};
1667
1668static int at91sam9260_udc_init(struct at91_udc *udc)
1669{
1670        struct at91_ep *ep;
1671        int i;
1672
1673        for (i = 0; i < NUM_ENDPOINTS; i++) {
1674                ep = &udc->ep[i];
1675
1676                switch (i) {
1677                case 0 ... 3:
1678                        ep->maxpacket = 64;
1679                        break;
1680                case 4 ... 5:
1681                        ep->maxpacket = 512;
1682                        break;
1683                }
1684        }
1685
1686        return 0;
1687}
1688
1689static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1690{
1691        u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1692
1693        if (is_on)
1694                txvc |= AT91_UDP_TXVC_PUON;
1695        else
1696                txvc &= ~AT91_UDP_TXVC_PUON;
1697
1698        at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1699}
1700
1701static const struct at91_udc_caps at91sam9260_udc_caps = {
1702        .init = at91sam9260_udc_init,
1703        .pullup = at91sam9260_udc_pullup,
1704};
1705
1706static int at91sam9261_udc_init(struct at91_udc *udc)
1707{
1708        struct at91_ep *ep;
1709        int i;
1710
1711        for (i = 0; i < NUM_ENDPOINTS; i++) {
1712                ep = &udc->ep[i];
1713
1714                switch (i) {
1715                case 0:
1716                        ep->maxpacket = 8;
1717                        break;
1718                case 1 ... 3:
1719                        ep->maxpacket = 64;
1720                        break;
1721                case 4 ... 5:
1722                        ep->maxpacket = 256;
1723                        break;
1724                }
1725        }
1726
1727        udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1728                                                      "atmel,matrix");
1729        return PTR_ERR_OR_ZERO(udc->matrix);
1730}
1731
1732static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1733{
1734        u32 usbpucr = 0;
1735
1736        if (is_on)
1737                usbpucr = AT91_MATRIX_USBPUCR_PUON;
1738
1739        regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1740                           AT91_MATRIX_USBPUCR_PUON, usbpucr);
1741}
1742
1743static const struct at91_udc_caps at91sam9261_udc_caps = {
1744        .init = at91sam9261_udc_init,
1745        .pullup = at91sam9261_udc_pullup,
1746};
1747
1748static int at91sam9263_udc_init(struct at91_udc *udc)
1749{
1750        struct at91_ep *ep;
1751        int i;
1752
1753        for (i = 0; i < NUM_ENDPOINTS; i++) {
1754                ep = &udc->ep[i];
1755
1756                switch (i) {
1757                case 0:
1758                case 1:
1759                case 2:
1760                case 3:
1761                        ep->maxpacket = 64;
1762                        break;
1763                case 4:
1764                case 5:
1765                        ep->maxpacket = 256;
1766                        break;
1767                }
1768        }
1769
1770        return 0;
1771}
1772
1773static const struct at91_udc_caps at91sam9263_udc_caps = {
1774        .init = at91sam9263_udc_init,
1775        .pullup = at91sam9260_udc_pullup,
1776};
1777
1778static const struct of_device_id at91_udc_dt_ids[] = {
1779        {
1780                .compatible = "atmel,at91rm9200-udc",
1781                .data = &at91rm9200_udc_caps,
1782        },
1783        {
1784                .compatible = "atmel,at91sam9260-udc",
1785                .data = &at91sam9260_udc_caps,
1786        },
1787        {
1788                .compatible = "atmel,at91sam9261-udc",
1789                .data = &at91sam9261_udc_caps,
1790        },
1791        {
1792                .compatible = "atmel,at91sam9263-udc",
1793                .data = &at91sam9263_udc_caps,
1794        },
1795        { /* sentinel */ }
1796};
1797MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1798
1799static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1800{
1801        struct at91_udc_data *board = &udc->board;
1802        const struct of_device_id *match;
1803        enum of_gpio_flags flags;
1804        u32 val;
1805
1806        if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1807                board->vbus_polled = 1;
1808
1809        board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1810                                                  &flags);
1811        board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1812
1813        board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1814                                                  &flags);
1815
1816        board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1817
1818        match = of_match_node(at91_udc_dt_ids, np);
1819        if (match)
1820                udc->caps = match->data;
1821}
1822
1823static int at91udc_probe(struct platform_device *pdev)
1824{
1825        struct device   *dev = &pdev->dev;
1826        struct at91_udc *udc;
1827        int             retval;
1828        struct resource *res;
1829        struct at91_ep  *ep;
1830        int             i;
1831
1832        udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1833        if (!udc)
1834                return -ENOMEM;
1835
1836        /* init software state */
1837        udc->gadget.dev.parent = dev;
1838        at91udc_of_init(udc, pdev->dev.of_node);
1839        udc->pdev = pdev;
1840        udc->enabled = 0;
1841        spin_lock_init(&udc->lock);
1842
1843        udc->gadget.ops = &at91_udc_ops;
1844        udc->gadget.ep0 = &udc->ep[0].ep;
1845        udc->gadget.name = driver_name;
1846        udc->gadget.dev.init_name = "gadget";
1847
1848        for (i = 0; i < NUM_ENDPOINTS; i++) {
1849                ep = &udc->ep[i];
1850                ep->ep.name = ep_info[i].name;
1851                ep->ep.caps = ep_info[i].caps;
1852                ep->ep.ops = &at91_ep_ops;
1853                ep->udc = udc;
1854                ep->int_mask = BIT(i);
1855                if (i != 0 && i != 3)
1856                        ep->is_pingpong = 1;
1857        }
1858
1859        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1860        udc->udp_baseaddr = devm_ioremap_resource(dev, res);
1861        if (IS_ERR(udc->udp_baseaddr))
1862                return PTR_ERR(udc->udp_baseaddr);
1863
1864        if (udc->caps && udc->caps->init) {
1865                retval = udc->caps->init(udc);
1866                if (retval)
1867                        return retval;
1868        }
1869
1870        udc_reinit(udc);
1871
1872        /* get interface and function clocks */
1873        udc->iclk = devm_clk_get(dev, "pclk");
1874        if (IS_ERR(udc->iclk))
1875                return PTR_ERR(udc->iclk);
1876
1877        udc->fclk = devm_clk_get(dev, "hclk");
1878        if (IS_ERR(udc->fclk))
1879                return PTR_ERR(udc->fclk);
1880
1881        /* don't do anything until we have both gadget driver and VBUS */
1882        clk_set_rate(udc->fclk, 48000000);
1883        retval = clk_prepare(udc->fclk);
1884        if (retval)
1885                return retval;
1886
1887        retval = clk_prepare_enable(udc->iclk);
1888        if (retval)
1889                goto err_unprepare_fclk;
1890
1891        at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1892        at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1893        /* Clear all pending interrupts - UDP may be used by bootloader. */
1894        at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1895        clk_disable(udc->iclk);
1896
1897        /* request UDC and maybe VBUS irqs */
1898        udc->udp_irq = platform_get_irq(pdev, 0);
1899        retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1900                                  driver_name, udc);
1901        if (retval) {
1902                DBG("request irq %d failed\n", udc->udp_irq);
1903                goto err_unprepare_iclk;
1904        }
1905
1906        if (gpio_is_valid(udc->board.vbus_pin)) {
1907                retval = devm_gpio_request(dev, udc->board.vbus_pin,
1908                                           "udc_vbus");
1909                if (retval) {
1910                        DBG("request vbus pin failed\n");
1911                        goto err_unprepare_iclk;
1912                }
1913
1914                gpio_direction_input(udc->board.vbus_pin);
1915
1916                /*
1917                 * Get the initial state of VBUS - we cannot expect
1918                 * a pending interrupt.
1919                 */
1920                udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1921                        udc->board.vbus_active_low;
1922
1923                if (udc->board.vbus_polled) {
1924                        INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1925                        setup_timer(&udc->vbus_timer, at91_vbus_timer,
1926                                    (unsigned long)udc);
1927                        mod_timer(&udc->vbus_timer,
1928                                  jiffies + VBUS_POLL_TIMEOUT);
1929                } else {
1930                        retval = devm_request_irq(dev,
1931                                        gpio_to_irq(udc->board.vbus_pin),
1932                                        at91_vbus_irq, 0, driver_name, udc);
1933                        if (retval) {
1934                                DBG("request vbus irq %d failed\n",
1935                                    udc->board.vbus_pin);
1936                                goto err_unprepare_iclk;
1937                        }
1938                }
1939        } else {
1940                DBG("no VBUS detection, assuming always-on\n");
1941                udc->vbus = 1;
1942        }
1943        retval = usb_add_gadget_udc(dev, &udc->gadget);
1944        if (retval)
1945                goto err_unprepare_iclk;
1946        dev_set_drvdata(dev, udc);
1947        device_init_wakeup(dev, 1);
1948        create_debug_file(udc);
1949
1950        INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1951        return 0;
1952
1953err_unprepare_iclk:
1954        clk_unprepare(udc->iclk);
1955err_unprepare_fclk:
1956        clk_unprepare(udc->fclk);
1957
1958        DBG("%s probe failed, %d\n", driver_name, retval);
1959
1960        return retval;
1961}
1962
1963static int at91udc_remove(struct platform_device *pdev)
1964{
1965        struct at91_udc *udc = platform_get_drvdata(pdev);
1966        unsigned long   flags;
1967
1968        DBG("remove\n");
1969
1970        usb_del_gadget_udc(&udc->gadget);
1971        if (udc->driver)
1972                return -EBUSY;
1973
1974        spin_lock_irqsave(&udc->lock, flags);
1975        pullup(udc, 0);
1976        spin_unlock_irqrestore(&udc->lock, flags);
1977
1978        device_init_wakeup(&pdev->dev, 0);
1979        remove_debug_file(udc);
1980        clk_unprepare(udc->fclk);
1981        clk_unprepare(udc->iclk);
1982
1983        return 0;
1984}
1985
1986#ifdef CONFIG_PM
1987static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1988{
1989        struct at91_udc *udc = platform_get_drvdata(pdev);
1990        int             wake = udc->driver && device_may_wakeup(&pdev->dev);
1991        unsigned long   flags;
1992
1993        /* Unless we can act normally to the host (letting it wake us up
1994         * whenever it has work for us) force disconnect.  Wakeup requires
1995         * PLLB for USB events (signaling for reset, wakeup, or incoming
1996         * tokens) and VBUS irqs (on systems which support them).
1997         */
1998        if ((!udc->suspended && udc->addr)
1999                        || !wake
2000                        || at91_suspend_entering_slow_clock()) {
2001                spin_lock_irqsave(&udc->lock, flags);
2002                pullup(udc, 0);
2003                wake = 0;
2004                spin_unlock_irqrestore(&udc->lock, flags);
2005        } else
2006                enable_irq_wake(udc->udp_irq);
2007
2008        udc->active_suspend = wake;
2009        if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
2010                enable_irq_wake(udc->board.vbus_pin);
2011        return 0;
2012}
2013
2014static int at91udc_resume(struct platform_device *pdev)
2015{
2016        struct at91_udc *udc = platform_get_drvdata(pdev);
2017        unsigned long   flags;
2018
2019        if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
2020            udc->active_suspend)
2021                disable_irq_wake(udc->board.vbus_pin);
2022
2023        /* maybe reconnect to host; if so, clocks on */
2024        if (udc->active_suspend)
2025                disable_irq_wake(udc->udp_irq);
2026        else {
2027                spin_lock_irqsave(&udc->lock, flags);
2028                pullup(udc, 1);
2029                spin_unlock_irqrestore(&udc->lock, flags);
2030        }
2031        return 0;
2032}
2033#else
2034#define at91udc_suspend NULL
2035#define at91udc_resume  NULL
2036#endif
2037
2038static struct platform_driver at91_udc_driver = {
2039        .remove         = at91udc_remove,
2040        .shutdown       = at91udc_shutdown,
2041        .suspend        = at91udc_suspend,
2042        .resume         = at91udc_resume,
2043        .driver         = {
2044                .name   = (char *) driver_name,
2045                .of_match_table = at91_udc_dt_ids,
2046        },
2047};
2048
2049module_platform_driver_probe(at91_udc_driver, at91udc_probe);
2050
2051MODULE_DESCRIPTION("AT91 udc driver");
2052MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2053MODULE_LICENSE("GPL");
2054MODULE_ALIAS("platform:at91_udc");
2055