drivers/usb/gadget/udc/omap_udc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * omap_udc.c -- for OMAP full speed udc; most chips support OTG.
   4  *
   5  * Copyright (C) 2004 Texas Instruments, Inc.
   6  * Copyright (C) 2004-2005 David Brownell
   7  *
   8  * OMAP2 & DMA support by Kyungmin Park <[email protected]>
   9  */
  10
  11 #undef  DEBUG
  12 #undef  VERBOSE
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/ioport.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/delay.h>
  20 #include <linux/slab.h>
  21 #include <linux/timer.h>
  22 #include <linux/list.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/usb/ch9.h>
  29 #include <linux/usb/gadget.h>
  30 #include <linux/usb/otg.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/clk.h>
  33 #include <linux/err.h>
  34 #include <linux/prefetch.h>
  35 #include <linux/io.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/unaligned.h>
  40 #include <asm/mach-types.h>
  41
  42 #include <linux/omap-dma.h>
  43 #include <linux/platform_data/usb-omap1.h>
  44
  45 #include <linux/soc/ti/omap1-usb.h>
  46 #include <linux/soc/ti/omap1-soc.h>
  47 #include <linux/soc/ti/omap1-io.h>
  48
  49 #include "omap_udc.h"
  50
  51 #undef  USB_TRACE
  52
  53 /* bulk DMA seems to be behaving for both IN and OUT */
  54 #define USE_DMA
  55
  56 /* ISO too */
  57 #define USE_ISO
  58
  59 #define DRIVER_DESC     "OMAP UDC driver"
  60 #define DRIVER_VERSION  "4 October 2004"
  61
  62 #define OMAP_DMA_USB_W2FC_TX0           29
  63 #define OMAP_DMA_USB_W2FC_RX0           26
  64
  65 /*
  66  * The OMAP UDC needs _very_ early endpoint setup:  before enabling the
  67  * D+ pullup to allow enumeration.  That's too early for the gadget
  68  * framework to use from usb_endpoint_enable(), which happens after
  69  * enumeration as part of activating an interface.  (But if we add an
  70  * optional new "UDC not yet running" state to the gadget driver model,
  71  * even just during driver binding, the endpoint autoconfig logic is the
  72  * natural spot to manufacture new endpoints.)
  73  *
  74  * So instead of using endpoint enable calls to control the hardware setup,
  75  * this driver defines a "fifo mode" parameter.  It's used during driver
  76  * initialization to choose among a set of pre-defined endpoint configs.
  77  * See omap_udc_setup() for available modes, or to add others.  That code
  78  * lives in an init section, so use this driver as a module if you need
  79  * to change the fifo mode after the kernel boots.
  80  *
  81  * Gadget drivers normally ignore endpoints they don't care about, and
  82  * won't include them in configuration descriptors.  That means only
  83  * misbehaving hosts would even notice they exist.
  84  */
  85 #ifdef  USE_ISO
  86 static unsigned fifo_mode = 3;
  87 #else
  88 static unsigned fifo_mode;
  89 #endif
  90
  91 /* "modprobe omap_udc fifo_mode=42", or else as a kernel
  92  * boot parameter "omap_udc:fifo_mode=42"
  93  */
  94 module_param(fifo_mode, uint, 0);
  95 MODULE_PARM_DESC(fifo_mode, "endpoint configuration");
  96
  97 #ifdef  USE_DMA
  98 static bool use_dma = 1;
  99
 100 /* "modprobe omap_udc use_dma=y", or else as a kernel
 101  * boot parameter "omap_udc:use_dma=y"
 102  */
 103 module_param(use_dma, bool, 0);
 104 MODULE_PARM_DESC(use_dma, "enable/disable DMA");
 105 #else   /* !USE_DMA */
 106
 107 /* save a bit of code */
 108 #define use_dma         0
 109 #endif  /* !USE_DMA */
 110
 111
 112 static const char driver_name[] = "omap_udc";
 113 static const char driver_desc[] = DRIVER_DESC;
 114
 115 /*-------------------------------------------------------------------------*/
 116
 117 /* there's a notion of "current endpoint" for modifying endpoint
 118  * state, and PIO access to its FIFO.
 119  */
 120
 121 static void use_ep(struct omap_ep *ep, u16 select)
 122 {
 123         u16     num = ep->bEndpointAddress & 0x0f;
 124
 125         if (ep->bEndpointAddress & USB_DIR_IN)
 126                 num |= UDC_EP_DIR;
 127         omap_writew(num | select, UDC_EP_NUM);
 128         /* when select, MUST deselect later !! */
 129 }
 130
 131 static inline void deselect_ep(void)
 132 {
 133         u16 w;
 134
 135         w = omap_readw(UDC_EP_NUM);
 136         w &= ~UDC_EP_SEL;
 137         omap_writew(w, UDC_EP_NUM);
 138         /* 6 wait states before TX will happen */
 139 }
 140
 141 static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);
 142
 143 /*-------------------------------------------------------------------------*/
 144
 145 static int omap_ep_enable(struct usb_ep *_ep,
 146                 const struct usb_endpoint_descriptor *desc)
 147 {
 148         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 149         struct omap_udc *udc;
 150         unsigned long   flags;
 151         u16             maxp;
 152
 153         /* catch various bogus parameters */
 154         if (!_ep || !desc
 155                         || desc->bDescriptorType != USB_DT_ENDPOINT
 156                         || ep->bEndpointAddress != desc->bEndpointAddress
 157                         || ep->maxpacket < usb_endpoint_maxp(desc)) {
 158                 DBG("%s, bad ep or descriptor\n", __func__);
 159                 return -EINVAL;
 160         }
 161         maxp = usb_endpoint_maxp(desc);
 162         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 163                                 && maxp != ep->maxpacket)
 164                         || usb_endpoint_maxp(desc) > ep->maxpacket
 165                         || !desc->wMaxPacketSize) {
 166                 DBG("%s, bad %s maxpacket\n", __func__, _ep->name);
 167                 return -ERANGE;
 168         }
 169
 170 #ifdef  USE_ISO
 171         if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
 172                                 && desc->bInterval != 1)) {
 173                 /* hardware wants period = 1; USB allows 2^(Interval-1) */
 174                 DBG("%s, unsupported ISO period %dms\n", _ep->name,
 175                                 1 << (desc->bInterval - 1));
 176                 return -EDOM;
 177         }
 178 #else
 179         if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 180                 DBG("%s, ISO nyet\n", _ep->name);
 181                 return -EDOM;
 182         }
 183 #endif
 184
 185         /* xfer types must match, except that interrupt ~= bulk */
 186         if (ep->bmAttributes != desc->bmAttributes
 187                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 188                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 189                 DBG("%s, %s type mismatch\n", __func__, _ep->name);
 190                 return -EINVAL;
 191         }
 192
 193         udc = ep->udc;
 194         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 195                 DBG("%s, bogus device state\n", __func__);
 196                 return -ESHUTDOWN;
 197         }
 198
 199         spin_lock_irqsave(&udc->lock, flags);
 200
 201         ep->ep.desc = desc;
 202         ep->irqs = 0;
 203         ep->stopped = 0;
 204         ep->ep.maxpacket = maxp;
 205
 206         /* set endpoint to initial state */
 207         ep->dma_channel = 0;
 208         ep->has_dma = 0;
 209         ep->lch = -1;
 210         use_ep(ep, UDC_EP_SEL);
 211         omap_writew(udc->clr_halt, UDC_CTRL);
 212         ep->ackwait = 0;
 213         deselect_ep();
 214
 215         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 216                 list_add(&ep->iso, &udc->iso);
 217
 218         /* maybe assign a DMA channel to this endpoint */
 219         if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
 220                 /* FIXME ISO can dma, but prefers first channel */
 221                 dma_channel_claim(ep, 0);
 222
 223         /* PIO OUT may RX packets */
 224         if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
 225                         && !ep->has_dma
 226                         && !(ep->bEndpointAddress & USB_DIR_IN)) {
 227                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 228                 ep->ackwait = 1 + ep->double_buf;
 229         }
 230
 231         spin_unlock_irqrestore(&udc->lock, flags);
 232         VDBG("%s enabled\n", _ep->name);
 233         return 0;
 234 }
 235
 236 static void nuke(struct omap_ep *, int status);
 237
 238 static int omap_ep_disable(struct usb_ep *_ep)
 239 {
 240         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 241         unsigned long   flags;
 242
 243         if (!_ep || !ep->ep.desc) {
 244                 DBG("%s, %s not enabled\n", __func__,
 245                         _ep ? ep->ep.name : NULL);
 246                 return -EINVAL;
 247         }
 248
 249         spin_lock_irqsave(&ep->udc->lock, flags);
 250         ep->ep.desc = NULL;
 251         nuke(ep, -ESHUTDOWN);
 252         ep->ep.maxpacket = ep->maxpacket;
 253         ep->has_dma = 0;
 254         omap_writew(UDC_SET_HALT, UDC_CTRL);
 255         list_del_init(&ep->iso);
 256         del_timer(&ep->timer);
 257
 258         spin_unlock_irqrestore(&ep->udc->lock, flags);
 259
 260         VDBG("%s disabled\n", _ep->name);
 261         return 0;
 262 }
 263
 264 /*-------------------------------------------------------------------------*/
 265
 266 static struct usb_request *
 267 omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 268 {
 269         struct omap_req *req;
 270
 271         req = kzalloc(sizeof(*req), gfp_flags);
 272         if (!req)
 273                 return NULL;
 274
 275         INIT_LIST_HEAD(&req->queue);
 276
 277         return &req->req;
 278 }
 279
 280 static void
 281 omap_free_request(struct usb_ep *ep, struct usb_request *_req)
 282 {
 283         struct omap_req *req = container_of(_req, struct omap_req, req);
 284
 285         kfree(req);
 286 }
 287
 288 /*-------------------------------------------------------------------------*/
 289
 290 static void
 291 done(struct omap_ep *ep, struct omap_req *req, int status)
 292 {
 293         struct omap_udc         *udc = ep->udc;
 294         unsigned                stopped = ep->stopped;
 295
 296         list_del_init(&req->queue);
 297
 298         if (req->req.status == -EINPROGRESS)
 299                 req->req.status = status;
 300         else
 301                 status = req->req.status;
 302
 303         if (use_dma && ep->has_dma)
 304                 usb_gadget_unmap_request(&udc->gadget, &req->req,
 305                                 (ep->bEndpointAddress & USB_DIR_IN));
 306
 307 #ifndef USB_TRACE
 308         if (status && status != -ESHUTDOWN)
 309 #endif
 310                 VDBG("complete %s req %p stat %d len %u/%u\n",
 311                         ep->ep.name, &req->req, status,
 312                         req->req.actual, req->req.length);
 313
 314         /* don't modify queue heads during completion callback */
 315         ep->stopped = 1;
 316         spin_unlock(&ep->udc->lock);
 317         usb_gadget_giveback_request(&ep->ep, &req->req);
 318         spin_lock(&ep->udc->lock);
 319         ep->stopped = stopped;
 320 }
 321
 322 /*-------------------------------------------------------------------------*/
 323
 324 #define UDC_FIFO_FULL           (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
 325 #define UDC_FIFO_UNWRITABLE     (UDC_EP_HALTED | UDC_FIFO_FULL)
 326
 327 #define FIFO_EMPTY      (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
 328 #define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
 329
 330 static inline int
 331 write_packet(u8 *buf, struct omap_req *req, unsigned max)
 332 {
 333         unsigned        len;
 334         u16             *wp;
 335
 336         len = min(req->req.length - req->req.actual, max);
 337         req->req.actual += len;
 338
 339         max = len;
 340         if (likely((((int)buf) & 1) == 0)) {
 341                 wp = (u16 *)buf;
 342                 while (max >= 2) {
 343                         omap_writew(*wp++, UDC_DATA);
 344                         max -= 2;
 345                 }
 346                 buf = (u8 *)wp;
 347         }
 348         while (max--)
 349                 omap_writeb(*buf++, UDC_DATA);
 350         return len;
 351 }
 352
 353 /* FIXME change r/w fifo calling convention */
 354
 355
 356 /* return:  0 = still running, 1 = completed, negative = errno */
 357 static int write_fifo(struct omap_ep *ep, struct omap_req *req)
 358 {
 359         u8              *buf;
 360         unsigned        count;
 361         int             is_last;
 362         u16             ep_stat;
 363
 364         buf = req->req.buf + req->req.actual;
 365         prefetch(buf);
 366
 367         /* PIO-IN isn't double buffered except for iso */
 368         ep_stat = omap_readw(UDC_STAT_FLG);
 369         if (ep_stat & UDC_FIFO_UNWRITABLE)
 370                 return 0;
 371
 372         count = ep->ep.maxpacket;
 373         count = write_packet(buf, req, count);
 374         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 375         ep->ackwait = 1;
 376
 377         /* last packet is often short (sometimes a zlp) */
 378         if (count != ep->ep.maxpacket)
 379                 is_last = 1;
 380         else if (req->req.length == req->req.actual
 381                         && !req->req.zero)
 382                 is_last = 1;
 383         else
 384                 is_last = 0;
 385
 386         /* NOTE:  requests complete when all IN data is in a
 387          * FIFO (or sometimes later, if a zlp was needed).
 388          * Use usb_ep_fifo_status() where needed.
 389          */
 390         if (is_last)
 391                 done(ep, req, 0);
 392         return is_last;
 393 }
 394
 395 static inline int
 396 read_packet(u8 *buf, struct omap_req *req, unsigned avail)
 397 {
 398         unsigned        len;
 399         u16             *wp;
 400
 401         len = min(req->req.length - req->req.actual, avail);
 402         req->req.actual += len;
 403         avail = len;
 404
 405         if (likely((((int)buf) & 1) == 0)) {
 406                 wp = (u16 *)buf;
 407                 while (avail >= 2) {
 408                         *wp++ = omap_readw(UDC_DATA);
 409                         avail -= 2;
 410                 }
 411                 buf = (u8 *)wp;
 412         }
 413         while (avail--)
 414                 *buf++ = omap_readb(UDC_DATA);
 415         return len;
 416 }
 417
 418 /* return:  0 = still running, 1 = queue empty, negative = errno */
 419 static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 420 {
 421         u8              *buf;
 422         unsigned        count, avail;
 423         int             is_last;
 424
 425         buf = req->req.buf + req->req.actual;
 426         prefetchw(buf);
 427
 428         for (;;) {
 429                 u16     ep_stat = omap_readw(UDC_STAT_FLG);
 430
 431                 is_last = 0;
 432                 if (ep_stat & FIFO_EMPTY) {
 433                         if (!ep->double_buf)
 434                                 break;
 435                         ep->fnf = 1;
 436                 }
 437                 if (ep_stat & UDC_EP_HALTED)
 438                         break;
 439
 440                 if (ep_stat & UDC_FIFO_FULL)
 441                         avail = ep->ep.maxpacket;
 442                 else  {
 443                         avail = omap_readw(UDC_RXFSTAT);
 444                         ep->fnf = ep->double_buf;
 445                 }
 446                 count = read_packet(buf, req, avail);
 447
 448                 /* partial packet reads may not be errors */
 449                 if (count < ep->ep.maxpacket) {
 450                         is_last = 1;
 451                         /* overflowed this request?  flush extra data */
 452                         if (count != avail) {
 453                                 req->req.status = -EOVERFLOW;
 454                                 avail -= count;
 455                                 while (avail--)
 456                                         omap_readw(UDC_DATA);
 457                         }
 458                 } else if (req->req.length == req->req.actual)
 459                         is_last = 1;
 460                 else
 461                         is_last = 0;
 462
 463                 if (!ep->bEndpointAddress)
 464                         break;
 465                 if (is_last)
 466                         done(ep, req, 0);
 467                 break;
 468         }
 469         return is_last;
 470 }
 471
 472 /*-------------------------------------------------------------------------*/
 473
 474 static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
 475 {
 476         dma_addr_t      end;
 477
 478         /* IN-DMA needs this on fault/cancel paths, so 15xx misreports
 479          * the last transfer's bytecount by more than a FIFO's worth.
 480          */
 481         if (cpu_is_omap15xx())
 482                 return 0;
 483
 484         end = omap_get_dma_src_pos(ep->lch);
 485         if (end == ep->dma_counter)
 486                 return 0;
 487
 488         end |= start & (0xffff << 16);
 489         if (end < start)
 490                 end += 0x10000;
 491         return end - start;
 492 }
 493
 494 static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
 495 {
 496         dma_addr_t      end;
 497
 498         end = omap_get_dma_dst_pos(ep->lch);
 499         if (end == ep->dma_counter)
 500                 return 0;
 501
 502         end |= start & (0xffff << 16);
 503         if (cpu_is_omap15xx())
 504                 end++;
 505         if (end < start)
 506                 end += 0x10000;
 507         return end - start;
 508 }
 509
 510
 511 /* Each USB transfer request using DMA maps to one or more DMA transfers.
 512  * When DMA completion isn't request completion, the UDC continues with
 513  * the next DMA transfer for that USB transfer.
 514  */
 515
 516 static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
 517 {
 518         u16             txdma_ctrl, w;
 519         unsigned        length = req->req.length - req->req.actual;
 520         const int       sync_mode = cpu_is_omap15xx()
 521                                 ? OMAP_DMA_SYNC_FRAME
 522                                 : OMAP_DMA_SYNC_ELEMENT;
 523         int             dma_trigger = 0;
 524
 525         /* measure length in either bytes or packets */
 526         if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC)
 527                         || (cpu_is_omap15xx() && length < ep->maxpacket)) {
 528                 txdma_ctrl = UDC_TXN_EOT | length;
 529                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
 530                                 length, 1, sync_mode, dma_trigger, 0);
 531         } else {
 532                 length = min(length / ep->maxpacket,
 533                                 (unsigned) UDC_TXN_TSC + 1);
 534                 txdma_ctrl = length;
 535                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 536                                 ep->ep.maxpacket >> 1, length, sync_mode,
 537                                 dma_trigger, 0);
 538                 length *= ep->maxpacket;
 539         }
 540         omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 541                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
 542                 0, 0);
 543
 544         omap_start_dma(ep->lch);
 545         ep->dma_counter = omap_get_dma_src_pos(ep->lch);
 546         w = omap_readw(UDC_DMA_IRQ_EN);
 547         w |= UDC_TX_DONE_IE(ep->dma_channel);
 548         omap_writew(w, UDC_DMA_IRQ_EN);
 549         omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel));
 550         req->dma_bytes = length;
 551 }
 552
 553 static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
 554 {
 555         u16 w;
 556
 557         if (status == 0) {
 558                 req->req.actual += req->dma_bytes;
 559
 560                 /* return if this request needs to send data or zlp */
 561                 if (req->req.actual < req->req.length)
 562                         return;
 563                 if (req->req.zero
 564                                 && req->dma_bytes != 0
 565                                 && (req->req.actual % ep->maxpacket) == 0)
 566                         return;
 567         } else
 568                 req->req.actual += dma_src_len(ep, req->req.dma
 569                                                         + req->req.actual);
 570
 571         /* tx completion */
 572         omap_stop_dma(ep->lch);
 573         w = omap_readw(UDC_DMA_IRQ_EN);
 574         w &= ~UDC_TX_DONE_IE(ep->dma_channel);
 575         omap_writew(w, UDC_DMA_IRQ_EN);
 576         done(ep, req, status);
 577 }
 578
 579 static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 580 {
 581         unsigned packets = req->req.length - req->req.actual;
 582         int dma_trigger = 0;
 583         u16 w;
 584
 585         /* set up this DMA transfer, enable the fifo, start */
 586         packets /= ep->ep.maxpacket;
 587         packets = min(packets, (unsigned)UDC_RXN_TC + 1);
 588         req->dma_bytes = packets * ep->ep.maxpacket;
 589         omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 590                         ep->ep.maxpacket >> 1, packets,
 591                         OMAP_DMA_SYNC_ELEMENT,
 592                         dma_trigger, 0);
 593         omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 594                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
 595                 0, 0);
 596         ep->dma_counter = omap_get_dma_dst_pos(ep->lch);
 597
 598         omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel));
 599         w = omap_readw(UDC_DMA_IRQ_EN);
 600         w |= UDC_RX_EOT_IE(ep->dma_channel);
 601         omap_writew(w, UDC_DMA_IRQ_EN);
 602         omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM);
 603         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 604
 605         omap_start_dma(ep->lch);
 606 }
 607
 608 static void
 609 finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
 610 {
 611         u16     count, w;
 612
 613         if (status == 0)
 614                 ep->dma_counter = (u16) (req->req.dma + req->req.actual);
 615         count = dma_dest_len(ep, req->req.dma + req->req.actual);
 616         count += req->req.actual;
 617         if (one)
 618                 count--;
 619         if (count <= req->req.length)
 620                 req->req.actual = count;
 621
 622         if (count != req->dma_bytes || status)
 623                 omap_stop_dma(ep->lch);
 624
 625         /* if this wasn't short, request may need another transfer */
 626         else if (req->req.actual < req->req.length)
 627                 return;
 628
 629         /* rx completion */
 630         w = omap_readw(UDC_DMA_IRQ_EN);
 631         w &= ~UDC_RX_EOT_IE(ep->dma_channel);
 632         omap_writew(w, UDC_DMA_IRQ_EN);
 633         done(ep, req, status);
 634 }
 635
 636 static void dma_irq(struct omap_udc *udc, u16 irq_src)
 637 {
 638         u16             dman_stat = omap_readw(UDC_DMAN_STAT);
 639         struct omap_ep  *ep;
 640         struct omap_req *req;
 641
 642         /* IN dma: tx to host */
 643         if (irq_src & UDC_TXN_DONE) {
 644                 ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
 645                 ep->irqs++;
 646                 /* can see TXN_DONE after dma abort */
 647                 if (!list_empty(&ep->queue)) {
 648                         req = container_of(ep->queue.next,
 649                                                 struct omap_req, queue);
 650                         finish_in_dma(ep, req, 0);
 651                 }
 652                 omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC);
 653
 654                 if (!list_empty(&ep->queue)) {
 655                         req = container_of(ep->queue.next,
 656                                         struct omap_req, queue);
 657                         next_in_dma(ep, req);
 658                 }
 659         }
 660
 661         /* OUT dma: rx from host */
 662         if (irq_src & UDC_RXN_EOT) {
 663                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 664                 ep->irqs++;
 665                 /* can see RXN_EOT after dma abort */
 666                 if (!list_empty(&ep->queue)) {
 667                         req = container_of(ep->queue.next,
 668                                         struct omap_req, queue);
 669                         finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
 670                 }
 671                 omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC);
 672
 673                 if (!list_empty(&ep->queue)) {
 674                         req = container_of(ep->queue.next,
 675                                         struct omap_req, queue);
 676                         next_out_dma(ep, req);
 677                 }
 678         }
 679
 680         if (irq_src & UDC_RXN_CNT) {
 681                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 682                 ep->irqs++;
 683                 /* omap15xx does this unasked... */
 684                 VDBG("%s, RX_CNT irq?\n", ep->ep.name);
 685                 omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC);
 686         }
 687 }
 688
 689 static void dma_error(int lch, u16 ch_status, void *data)
 690 {
 691         struct omap_ep  *ep = data;
 692
 693         /* if ch_status & OMAP_DMA_DROP_IRQ ... */
 694         /* if ch_status & OMAP1_DMA_TOUT_IRQ ... */
 695         ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);
 696
 697         /* complete current transfer ... */
 698 }
 699
 700 static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 701 {
 702         u16     reg;
 703         int     status, restart, is_in;
 704         int     dma_channel;
 705
 706         is_in = ep->bEndpointAddress & USB_DIR_IN;
 707         if (is_in)
 708                 reg = omap_readw(UDC_TXDMA_CFG);
 709         else
 710                 reg = omap_readw(UDC_RXDMA_CFG);
 711         reg |= UDC_DMA_REQ;             /* "pulse" activated */
 712
 713         ep->dma_channel = 0;
 714         ep->lch = -1;
 715         if (channel == 0 || channel > 3) {
 716                 if ((reg & 0x0f00) == 0)
 717                         channel = 3;
 718                 else if ((reg & 0x00f0) == 0)
 719                         channel = 2;
 720                 else if ((reg & 0x000f) == 0)   /* preferred for ISO */
 721                         channel = 1;
 722                 else {
 723                         status = -EMLINK;
 724                         goto just_restart;
 725                 }
 726         }
 727         reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
 728         ep->dma_channel = channel;
 729
 730         if (is_in) {
 731                 dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel;
 732                 status = omap_request_dma(dma_channel,
 733                         ep->ep.name, dma_error, ep, &ep->lch);
 734                 if (status == 0) {
 735                         omap_writew(reg, UDC_TXDMA_CFG);
 736                         /* EMIFF or SDRC */
 737                         omap_set_dma_src_burst_mode(ep->lch,
 738                                                 OMAP_DMA_DATA_BURST_4);
 739                         omap_set_dma_src_data_pack(ep->lch, 1);
 740                         /* TIPB */
 741                         omap_set_dma_dest_params(ep->lch,
 742                                 OMAP_DMA_PORT_TIPB,
 743                                 OMAP_DMA_AMODE_CONSTANT,
 744                                 UDC_DATA_DMA,
 745                                 0, 0);
 746                 }
 747         } else {
 748                 dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel;
 749                 status = omap_request_dma(dma_channel,
 750                         ep->ep.name, dma_error, ep, &ep->lch);
 751                 if (status == 0) {
 752                         omap_writew(reg, UDC_RXDMA_CFG);
 753                         /* TIPB */
 754                         omap_set_dma_src_params(ep->lch,
 755                                 OMAP_DMA_PORT_TIPB,
 756                                 OMAP_DMA_AMODE_CONSTANT,
 757                                 UDC_DATA_DMA,
 758                                 0, 0);
 759                         /* EMIFF or SDRC */
 760                         omap_set_dma_dest_burst_mode(ep->lch,
 761                                                 OMAP_DMA_DATA_BURST_4);
 762                         omap_set_dma_dest_data_pack(ep->lch, 1);
 763                 }
 764         }
 765         if (status)
 766                 ep->dma_channel = 0;
 767         else {
 768                 ep->has_dma = 1;
 769                 omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);
 770
 771                 /* channel type P: hw synch (fifo) */
 772                 if (!cpu_is_omap15xx())
 773                         omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P);
 774         }
 775
 776 just_restart:
 777         /* restart any queue, even if the claim failed  */
 778         restart = !ep->stopped && !list_empty(&ep->queue);
 779
 780         if (status)
 781                 DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
 782                         restart ? " (restart)" : "");
 783         else
 784                 DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
 785                         is_in ? 't' : 'r',
 786                         ep->dma_channel - 1, ep->lch,
 787                         restart ? " (restart)" : "");
 788
 789         if (restart) {
 790                 struct omap_req *req;
 791                 req = container_of(ep->queue.next, struct omap_req, queue);
 792                 if (ep->has_dma)
 793                         (is_in ? next_in_dma : next_out_dma)(ep, req);
 794                 else {
 795                         use_ep(ep, UDC_EP_SEL);
 796                         (is_in ? write_fifo : read_fifo)(ep, req);
 797                         deselect_ep();
 798                         if (!is_in) {
 799                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 800                                 ep->ackwait = 1 + ep->double_buf;
 801                         }
 802                         /* IN: 6 wait states before it'll tx */
 803                 }
 804         }
 805 }
 806
 807 static void dma_channel_release(struct omap_ep *ep)
 808 {
 809         int             shift = 4 * (ep->dma_channel - 1);
 810         u16             mask = 0x0f << shift;
 811         struct omap_req *req;
 812         int             active;
 813
 814         /* abort any active usb transfer request */
 815         if (!list_empty(&ep->queue))
 816                 req = container_of(ep->queue.next, struct omap_req, queue);
 817         else
 818                 req = NULL;
 819
 820         active = omap_get_dma_active_status(ep->lch);
 821
 822         DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
 823                         active ? "active" : "idle",
 824                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
 825                         ep->dma_channel - 1, req);
 826
 827         /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before
 828          * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them.
 829          */
 830
 831         /* wait till current packet DMA finishes, and fifo empties */
 832         if (ep->bEndpointAddress & USB_DIR_IN) {
 833                 omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ,
 834                                         UDC_TXDMA_CFG);
 835
 836                 if (req) {
 837                         finish_in_dma(ep, req, -ECONNRESET);
 838
 839                         /* clear FIFO; hosts probably won't empty it */
 840                         use_ep(ep, UDC_EP_SEL);
 841                         omap_writew(UDC_CLR_EP, UDC_CTRL);
 842                         deselect_ep();
 843                 }
 844                 while (omap_readw(UDC_TXDMA_CFG) & mask)
 845                         udelay(10);
 846         } else {
 847                 omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ,
 848                                         UDC_RXDMA_CFG);
 849
 850                 /* dma empties the fifo */
 851                 while (omap_readw(UDC_RXDMA_CFG) & mask)
 852                         udelay(10);
 853                 if (req)
 854                         finish_out_dma(ep, req, -ECONNRESET, 0);
 855         }
 856         omap_free_dma(ep->lch);
 857         ep->dma_channel = 0;
 858         ep->lch = -1;
 859         /* has_dma still set, till endpoint is fully quiesced */
 860 }
 861
 862
 863 /*-------------------------------------------------------------------------*/
 864
 865 static int
 866 omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 867 {
 868         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 869         struct omap_req *req = container_of(_req, struct omap_req, req);
 870         struct omap_udc *udc;
 871         unsigned long   flags;
 872         int             is_iso = 0;
 873
 874         /* catch various bogus parameters */
 875         if (!_req || !req->req.complete || !req->req.buf
 876                         || !list_empty(&req->queue)) {
 877                 DBG("%s, bad params\n", __func__);
 878                 return -EINVAL;
 879         }
 880         if (!_ep || (!ep->ep.desc && ep->bEndpointAddress)) {
 881                 DBG("%s, bad ep\n", __func__);
 882                 return -EINVAL;
 883         }
 884         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 885                 if (req->req.length > ep->ep.maxpacket)
 886                         return -EMSGSIZE;
 887                 is_iso = 1;
 888         }
 889
 890         /* this isn't bogus, but OMAP DMA isn't the only hardware to
 891          * have a hard time with partial packet reads...  reject it.
 892          */
 893         if (use_dma
 894                         && ep->has_dma
 895                         && ep->bEndpointAddress != 0
 896                         && (ep->bEndpointAddress & USB_DIR_IN) == 0
 897                         && (req->req.length % ep->ep.maxpacket) != 0) {
 898                 DBG("%s, no partial packet OUT reads\n", __func__);
 899                 return -EMSGSIZE;
 900         }
 901
 902         udc = ep->udc;
 903         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
 904                 return -ESHUTDOWN;
 905
 906         if (use_dma && ep->has_dma)
 907                 usb_gadget_map_request(&udc->gadget, &req->req,
 908                                 (ep->bEndpointAddress & USB_DIR_IN));
 909
 910         VDBG("%s queue req %p, len %d buf %p\n",
 911                 ep->ep.name, _req, _req->length, _req->buf);
 912
 913         spin_lock_irqsave(&udc->lock, flags);
 914
 915         req->req.status = -EINPROGRESS;
 916         req->req.actual = 0;
 917
 918         /* maybe kickstart non-iso i/o queues */
 919         if (is_iso) {
 920                 u16 w;
 921
 922                 w = omap_readw(UDC_IRQ_EN);
 923                 w |= UDC_SOF_IE;
 924                 omap_writew(w, UDC_IRQ_EN);
 925         } else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
 926                 int     is_in;
 927
 928                 if (ep->bEndpointAddress == 0) {
 929                         if (!udc->ep0_pending || !list_empty(&ep->queue)) {
 930                                 spin_unlock_irqrestore(&udc->lock, flags);
 931                                 return -EL2HLT;
 932                         }
 933
 934                         /* empty DATA stage? */
 935                         is_in = udc->ep0_in;
 936                         if (!req->req.length) {
 937
 938                                 /* chip became CONFIGURED or ADDRESSED
 939                                  * earlier; drivers may already have queued
 940                                  * requests to non-control endpoints
 941                                  */
 942                                 if (udc->ep0_set_config) {
 943                                         u16     irq_en = omap_readw(UDC_IRQ_EN);
 944
 945                                         irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
 946                                         if (!udc->ep0_reset_config)
 947                                                 irq_en |= UDC_EPN_RX_IE
 948                                                         | UDC_EPN_TX_IE;
 949                                         omap_writew(irq_en, UDC_IRQ_EN);
 950                                 }
 951
 952                                 /* STATUS for zero length DATA stages is
 953                                  * always an IN ... even for IN transfers,
 954                                  * a weird case which seem to stall OMAP.
 955                                  */
 956                                 omap_writew(UDC_EP_SEL | UDC_EP_DIR,
 957                                                 UDC_EP_NUM);
 958                                 omap_writew(UDC_CLR_EP, UDC_CTRL);
 959                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 960                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 961
 962                                 /* cleanup */
 963                                 udc->ep0_pending = 0;
 964                                 done(ep, req, 0);
 965                                 req = NULL;
 966
 967                         /* non-empty DATA stage */
 968                         } else if (is_in) {
 969                                 omap_writew(UDC_EP_SEL | UDC_EP_DIR,
 970                                                 UDC_EP_NUM);
 971                         } else {
 972                                 if (udc->ep0_setup)
 973                                         goto irq_wait;
 974                                 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
 975                         }
 976                 } else {
 977                         is_in = ep->bEndpointAddress & USB_DIR_IN;
 978                         if (!ep->has_dma)
 979                                 use_ep(ep, UDC_EP_SEL);
 980                         /* if ISO: SOF IRQs must be enabled/disabled! */
 981                 }
 982
 983                 if (ep->has_dma)
 984                         (is_in ? next_in_dma : next_out_dma)(ep, req);
 985                 else if (req) {
 986                         if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
 987                                 req = NULL;
 988                         deselect_ep();
 989                         if (!is_in) {
 990                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 991                                 ep->ackwait = 1 + ep->double_buf;
 992                         }
 993                         /* IN: 6 wait states before it'll tx */
 994                 }
 995         }
 996
 997 irq_wait:
 998         /* irq handler advances the queue */
 999         if (req != NULL)
1000                 list_add_tail(&req->queue, &ep->queue);
1001         spin_unlock_irqrestore(&udc->lock, flags);
1002
1003         return 0;
1004 }
1005
1006 static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1007 {
1008         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1009         struct omap_req *req = NULL, *iter;
1010         unsigned long   flags;
1011
1012         if (!_ep || !_req)
1013                 return -EINVAL;
1014
1015         spin_lock_irqsave(&ep->udc->lock, flags);
1016
1017         /* make sure it's actually queued on this endpoint */
1018         list_for_each_entry(iter, &ep->queue, queue) {
1019                 if (&iter->req != _req)
1020                         continue;
1021                 req = iter;
1022                 break;
1023         }
1024         if (!req) {
1025                 spin_unlock_irqrestore(&ep->udc->lock, flags);
1026                 return -EINVAL;
1027         }
1028
1029         if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
1030                 int channel = ep->dma_channel;
1031
1032                 /* releasing the channel cancels the request,
1033                  * reclaiming the channel restarts the queue
1034                  */
1035                 dma_channel_release(ep);
1036                 dma_channel_claim(ep, channel);
1037         } else
1038                 done(ep, req, -ECONNRESET);
1039         spin_unlock_irqrestore(&ep->udc->lock, flags);
1040         return 0;
1041 }
1042
1043 /*-------------------------------------------------------------------------*/
1044
1045 static int omap_ep_set_halt(struct usb_ep *_ep, int value)
1046 {
1047         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1048         unsigned long   flags;
1049         int             status = -EOPNOTSUPP;
1050
1051         spin_lock_irqsave(&ep->udc->lock, flags);
1052
1053         /* just use protocol stalls for ep0; real halts are annoying */
1054         if (ep->bEndpointAddress == 0) {
1055                 if (!ep->udc->ep0_pending)
1056                         status = -EINVAL;
1057                 else if (value) {
1058                         if (ep->udc->ep0_set_config) {
1059                                 WARNING("error changing config?\n");
1060                                 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1061                         }
1062                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1063                         ep->udc->ep0_pending = 0;
1064                         status = 0;
1065                 } else /* NOP */
1066                         status = 0;
1067
1068         /* otherwise, all active non-ISO endpoints can halt */
1069         } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->ep.desc) {
1070
1071                 /* IN endpoints must already be idle */
1072                 if ((ep->bEndpointAddress & USB_DIR_IN)
1073                                 && !list_empty(&ep->queue)) {
1074                         status = -EAGAIN;
1075                         goto done;
1076                 }
1077
1078                 if (value) {
1079                         int     channel;
1080
1081                         if (use_dma && ep->dma_channel
1082                                         && !list_empty(&ep->queue)) {
1083                                 channel = ep->dma_channel;
1084                                 dma_channel_release(ep);
1085                         } else
1086                                 channel = 0;
1087
1088                         use_ep(ep, UDC_EP_SEL);
1089                         if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) {
1090                                 omap_writew(UDC_SET_HALT, UDC_CTRL);
1091                                 status = 0;
1092                         } else
1093                                 status = -EAGAIN;
1094                         deselect_ep();
1095
1096                         if (channel)
1097                                 dma_channel_claim(ep, channel);
1098                 } else {
1099                         use_ep(ep, 0);
1100                         omap_writew(ep->udc->clr_halt, UDC_CTRL);
1101                         ep->ackwait = 0;
1102                         if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1103                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1104                                 ep->ackwait = 1 + ep->double_buf;
1105                         }
1106                 }
1107         }
1108 done:
1109         VDBG("%s %s halt stat %d\n", ep->ep.name,
1110                 value ? "set" : "clear", status);
1111
1112         spin_unlock_irqrestore(&ep->udc->lock, flags);
1113         return status;
1114 }
1115
1116 static const struct usb_ep_ops omap_ep_ops = {
1117         .enable         = omap_ep_enable,
1118         .disable        = omap_ep_disable,
1119
1120         .alloc_request  = omap_alloc_request,
1121         .free_request   = omap_free_request,
1122
1123         .queue          = omap_ep_queue,
1124         .dequeue        = omap_ep_dequeue,
1125
1126         .set_halt       = omap_ep_set_halt,
1127         /* fifo_status ... report bytes in fifo */
1128         /* fifo_flush ... flush fifo */
1129 };
1130
1131 /*-------------------------------------------------------------------------*/
1132
1133 static int omap_get_frame(struct usb_gadget *gadget)
1134 {
1135         u16     sof = omap_readw(UDC_SOF);
1136         return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
1137 }
1138
1139 static int omap_wakeup(struct usb_gadget *gadget)
1140 {
1141         struct omap_udc *udc;
1142         unsigned long   flags;
1143         int             retval = -EHOSTUNREACH;
1144
1145         udc = container_of(gadget, struct omap_udc, gadget);
1146
1147         spin_lock_irqsave(&udc->lock, flags);
1148         if (udc->devstat & UDC_SUS) {
1149                 /* NOTE:  OTG spec erratum says that OTG devices may
1150                  * issue wakeups without host enable.
1151                  */
1152                 if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
1153                         DBG("remote wakeup...\n");
1154                         omap_writew(UDC_RMT_WKP, UDC_SYSCON2);
1155                         retval = 0;
1156                 }
1157
1158         /* NOTE:  non-OTG systems may use SRP TOO... */
1159         } else if (!(udc->devstat & UDC_ATT)) {
1160                 if (!IS_ERR_OR_NULL(udc->transceiver))
1161                         retval = otg_start_srp(udc->transceiver->otg);
1162         }
1163         spin_unlock_irqrestore(&udc->lock, flags);
1164
1165         return retval;
1166 }
1167
1168 static int
1169 omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1170 {
1171         struct omap_udc *udc;
1172         unsigned long   flags;
1173         u16             syscon1;
1174
1175         gadget->is_selfpowered = (is_selfpowered != 0);
1176         udc = container_of(gadget, struct omap_udc, gadget);
1177         spin_lock_irqsave(&udc->lock, flags);
1178         syscon1 = omap_readw(UDC_SYSCON1);
1179         if (is_selfpowered)
1180                 syscon1 |= UDC_SELF_PWR;
1181         else
1182                 syscon1 &= ~UDC_SELF_PWR;
1183         omap_writew(syscon1, UDC_SYSCON1);
1184         spin_unlock_irqrestore(&udc->lock, flags);
1185
1186         return 0;
1187 }
1188
1189 static int can_pullup(struct omap_udc *udc)
1190 {
1191         return udc->driver && udc->softconnect && udc->vbus_active;
1192 }
1193
1194 static void pullup_enable(struct omap_udc *udc)
1195 {
1196         u16 w;
1197
1198         w = omap_readw(UDC_SYSCON1);
1199         w |= UDC_PULLUP_EN;
1200         omap_writew(w, UDC_SYSCON1);
1201         if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1202                 u32 l;
1203
1204                 l = omap_readl(OTG_CTRL);
1205                 l |= OTG_BSESSVLD;
1206                 omap_writel(l, OTG_CTRL);
1207         }
1208         omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1209 }
1210
1211 static void pullup_disable(struct omap_udc *udc)
1212 {
1213         u16 w;
1214
1215         if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1216                 u32 l;
1217
1218                 l = omap_readl(OTG_CTRL);
1219                 l &= ~OTG_BSESSVLD;
1220                 omap_writel(l, OTG_CTRL);
1221         }
1222         omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1223         w = omap_readw(UDC_SYSCON1);
1224         w &= ~UDC_PULLUP_EN;
1225         omap_writew(w, UDC_SYSCON1);
1226 }
1227
1228 static struct omap_udc *udc;
1229
1230 static void omap_udc_enable_clock(int enable)
1231 {
1232         if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL)
1233                 return;
1234
1235         if (enable) {
1236                 clk_enable(udc->dc_clk);
1237                 clk_enable(udc->hhc_clk);
1238                 udelay(100);
1239         } else {
1240                 clk_disable(udc->hhc_clk);
1241                 clk_disable(udc->dc_clk);
1242         }
1243 }
1244
1245 /*
1246  * Called by whatever detects VBUS sessions:  external transceiver
1247  * driver, or maybe GPIO0 VBUS IRQ.  May request 48 MHz clock.
1248  */
1249 static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
1250 {
1251         struct omap_udc *udc;
1252         unsigned long   flags;
1253         u32 l;
1254
1255         udc = container_of(gadget, struct omap_udc, gadget);
1256         spin_lock_irqsave(&udc->lock, flags);
1257         VDBG("VBUS %s\n", is_active ? "on" : "off");
1258         udc->vbus_active = (is_active != 0);
1259         if (cpu_is_omap15xx()) {
1260                 /* "software" detect, ignored if !VBUS_MODE_1510 */
1261                 l = omap_readl(FUNC_MUX_CTRL_0);
1262                 if (is_active)
1263                         l |= VBUS_CTRL_1510;
1264                 else
1265                         l &= ~VBUS_CTRL_1510;
1266                 omap_writel(l, FUNC_MUX_CTRL_0);
1267         }
1268         if (udc->dc_clk != NULL && is_active) {
1269                 if (!udc->clk_requested) {
1270                         omap_udc_enable_clock(1);
1271                         udc->clk_requested = 1;
1272                 }
1273         }
1274         if (can_pullup(udc))
1275                 pullup_enable(udc);
1276         else
1277                 pullup_disable(udc);
1278         if (udc->dc_clk != NULL && !is_active) {
1279                 if (udc->clk_requested) {
1280                         omap_udc_enable_clock(0);
1281                         udc->clk_requested = 0;
1282                 }
1283         }
1284         spin_unlock_irqrestore(&udc->lock, flags);
1285         return 0;
1286 }
1287
1288 static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1289 {
1290         struct omap_udc *udc;
1291
1292         udc = container_of(gadget, struct omap_udc, gadget);
1293         if (!IS_ERR_OR_NULL(udc->transceiver))
1294                 return usb_phy_set_power(udc->transceiver, mA);
1295         return -EOPNOTSUPP;
1296 }
1297
1298 static int omap_pullup(struct usb_gadget *gadget, int is_on)
1299 {
1300         struct omap_udc *udc;
1301         unsigned long   flags;
1302
1303         udc = container_of(gadget, struct omap_udc, gadget);
1304         spin_lock_irqsave(&udc->lock, flags);
1305         udc->softconnect = (is_on != 0);
1306         if (can_pullup(udc))
1307                 pullup_enable(udc);
1308         else
1309                 pullup_disable(udc);
1310         spin_unlock_irqrestore(&udc->lock, flags);
1311         return 0;
1312 }
1313
1314 static int omap_udc_start(struct usb_gadget *g,
1315                 struct usb_gadget_driver *driver);
1316 static int omap_udc_stop(struct usb_gadget *g);
1317
1318 static const struct usb_gadget_ops omap_gadget_ops = {
1319         .get_frame              = omap_get_frame,
1320         .wakeup                 = omap_wakeup,
1321         .set_selfpowered        = omap_set_selfpowered,
1322         .vbus_session           = omap_vbus_session,
1323         .vbus_draw              = omap_vbus_draw,
1324         .pullup                 = omap_pullup,
1325         .udc_start              = omap_udc_start,
1326         .udc_stop               = omap_udc_stop,
1327 };
1328
1329 /*-------------------------------------------------------------------------*/
1330
1331 /* dequeue ALL requests; caller holds udc->lock */
1332 static void nuke(struct omap_ep *ep, int status)
1333 {
1334         struct omap_req *req;
1335
1336         ep->stopped = 1;
1337
1338         if (use_dma && ep->dma_channel)
1339                 dma_channel_release(ep);
1340
1341         use_ep(ep, 0);
1342         omap_writew(UDC_CLR_EP, UDC_CTRL);
1343         if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
1344                 omap_writew(UDC_SET_HALT, UDC_CTRL);
1345
1346         while (!list_empty(&ep->queue)) {
1347                 req = list_entry(ep->queue.next, struct omap_req, queue);
1348                 done(ep, req, status);
1349         }
1350 }
1351
1352 /* caller holds udc->lock */
1353 static void udc_quiesce(struct omap_udc *udc)
1354 {
1355         struct omap_ep  *ep;
1356
1357         udc->gadget.speed = USB_SPEED_UNKNOWN;
1358         nuke(&udc->ep[0], -ESHUTDOWN);
1359         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list)
1360                 nuke(ep, -ESHUTDOWN);
1361 }
1362
1363 /*-------------------------------------------------------------------------*/
1364
1365 static void update_otg(struct omap_udc *udc)
1366 {
1367         u16     devstat;
1368
1369         if (!gadget_is_otg(&udc->gadget))
1370                 return;
1371
1372         if (omap_readl(OTG_CTRL) & OTG_ID)
1373                 devstat = omap_readw(UDC_DEVSTAT);
1374         else
1375                 devstat = 0;
1376
1377         udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
1378         udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
1379         udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);
1380
1381         /* Enable HNP early, avoiding races on suspend irq path.
1382          * ASSUMES OTG state machine B_BUS_REQ input is true.
1383          */
1384         if (udc->gadget.b_hnp_enable) {
1385                 u32 l;
1386
1387                 l = omap_readl(OTG_CTRL);
1388                 l |= OTG_B_HNPEN | OTG_B_BUSREQ;
1389                 l &= ~OTG_PULLUP;
1390                 omap_writel(l, OTG_CTRL);
1391         }
1392 }
1393
1394 static void ep0_irq(struct omap_udc *udc, u16 irq_src)
1395 {
1396         struct omap_ep  *ep0 = &udc->ep[0];
1397         struct omap_req *req = NULL;
1398
1399         ep0->irqs++;
1400
1401         /* Clear any pending requests and then scrub any rx/tx state
1402          * before starting to handle the SETUP request.
1403          */
1404         if (irq_src & UDC_SETUP) {
1405                 u16     ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);
1406
1407                 nuke(ep0, 0);
1408                 if (ack) {
1409                         omap_writew(ack, UDC_IRQ_SRC);
1410                         irq_src = UDC_SETUP;
1411                 }
1412         }
1413
1414         /* IN/OUT packets mean we're in the DATA or STATUS stage.
1415          * This driver uses only uses protocol stalls (ep0 never halts),
1416          * and if we got this far the gadget driver already had a
1417          * chance to stall.  Tries to be forgiving of host oddities.
1418          *
1419          * NOTE:  the last chance gadget drivers have to stall control
1420          * requests is during their request completion callback.
1421          */
1422         if (!list_empty(&ep0->queue))
1423                 req = container_of(ep0->queue.next, struct omap_req, queue);
1424
1425         /* IN == TX to host */
1426         if (irq_src & UDC_EP0_TX) {
1427                 int     stat;
1428
1429                 omap_writew(UDC_EP0_TX, UDC_IRQ_SRC);
1430                 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1431                 stat = omap_readw(UDC_STAT_FLG);
1432                 if (stat & UDC_ACK) {
1433                         if (udc->ep0_in) {
1434                                 /* write next IN packet from response,
1435                                  * or set up the status stage.
1436                                  */
1437                                 if (req)
1438                                         stat = write_fifo(ep0, req);
1439                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1440                                 if (!req && udc->ep0_pending) {
1441                                         omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1442                                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1443                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1444                                         omap_writew(0, UDC_EP_NUM);
1445                                         udc->ep0_pending = 0;
1446                                 } /* else:  6 wait states before it'll tx */
1447                         } else {
1448                                 /* ack status stage of OUT transfer */
1449                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1450                                 if (req)
1451                                         done(ep0, req, 0);
1452                         }
1453                         req = NULL;
1454                 } else if (stat & UDC_STALL) {
1455                         omap_writew(UDC_CLR_HALT, UDC_CTRL);
1456                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1457                 } else {
1458                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1459                 }
1460         }
1461
1462         /* OUT == RX from host */
1463         if (irq_src & UDC_EP0_RX) {
1464                 int     stat;
1465
1466                 omap_writew(UDC_EP0_RX, UDC_IRQ_SRC);
1467                 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1468                 stat = omap_readw(UDC_STAT_FLG);
1469                 if (stat & UDC_ACK) {
1470                         if (!udc->ep0_in) {
1471                                 stat = 0;
1472                                 /* read next OUT packet of request, maybe
1473                                  * reactivating the fifo; stall on errors.
1474                                  */
1475                                 stat = read_fifo(ep0, req);
1476                                 if (!req || stat < 0) {
1477                                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1478                                         udc->ep0_pending = 0;
1479                                         stat = 0;
1480                                 } else if (stat == 0)
1481                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1482                                 omap_writew(0, UDC_EP_NUM);
1483
1484                                 /* activate status stage */
1485                                 if (stat == 1) {
1486                                         done(ep0, req, 0);
1487                                         /* that may have STALLed ep0... */
1488                                         omap_writew(UDC_EP_SEL | UDC_EP_DIR,
1489                                                         UDC_EP_NUM);
1490                                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1491                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1492                                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1493                                         udc->ep0_pending = 0;
1494                                 }
1495                         } else {
1496                                 /* ack status stage of IN transfer */
1497                                 omap_writew(0, UDC_EP_NUM);
1498                                 if (req)
1499                                         done(ep0, req, 0);
1500                         }
1501                 } else if (stat & UDC_STALL) {
1502                         omap_writew(UDC_CLR_HALT, UDC_CTRL);
1503                         omap_writew(0, UDC_EP_NUM);
1504                 } else {
1505                         omap_writew(0, UDC_EP_NUM);
1506                 }
1507         }
1508
1509         /* SETUP starts all control transfers */
1510         if (irq_src & UDC_SETUP) {
1511                 union u {
1512                         u16                     word[4];
1513                         struct usb_ctrlrequest  r;
1514                 } u;
1515                 int                     status = -EINVAL;
1516                 struct omap_ep          *ep;
1517
1518                 /* read the (latest) SETUP message */
1519                 do {
1520                         omap_writew(UDC_SETUP_SEL, UDC_EP_NUM);
1521                         /* two bytes at a time */
1522                         u.word[0] = omap_readw(UDC_DATA);
1523                         u.word[1] = omap_readw(UDC_DATA);
1524                         u.word[2] = omap_readw(UDC_DATA);
1525                         u.word[3] = omap_readw(UDC_DATA);
1526                         omap_writew(0, UDC_EP_NUM);
1527                 } while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP);
1528
1529 #define w_value         le16_to_cpu(u.r.wValue)
1530 #define w_index         le16_to_cpu(u.r.wIndex)
1531 #define w_length        le16_to_cpu(u.r.wLength)
1532
1533                 /* Delegate almost all control requests to the gadget driver,
1534                  * except for a handful of ch9 status/feature requests that
1535                  * hardware doesn't autodecode _and_ the gadget API hides.
1536                  */
1537                 udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
1538                 udc->ep0_set_config = 0;
1539                 udc->ep0_pending = 1;
1540                 ep0->stopped = 0;
1541                 ep0->ackwait = 0;
1542                 switch (u.r.bRequest) {
1543                 case USB_REQ_SET_CONFIGURATION:
1544                         /* udc needs to know when ep != 0 is valid */
1545                         if (u.r.bRequestType != USB_RECIP_DEVICE)
1546                                 goto delegate;
1547                         if (w_length != 0)
1548                                 goto do_stall;
1549                         udc->ep0_set_config = 1;
1550                         udc->ep0_reset_config = (w_value == 0);
1551                         VDBG("set config %d\n", w_value);
1552
1553                         /* update udc NOW since gadget driver may start
1554                          * queueing requests immediately; clear config
1555                          * later if it fails the request.
1556                          */
1557                         if (udc->ep0_reset_config)
1558                                 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1559                         else
1560                                 omap_writew(UDC_DEV_CFG, UDC_SYSCON2);
1561                         update_otg(udc);
1562                         goto delegate;
1563                 case USB_REQ_CLEAR_FEATURE:
1564                         /* clear endpoint halt */
1565                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1566                                 goto delegate;
1567                         if (w_value != USB_ENDPOINT_HALT
1568                                         || w_length != 0)
1569                                 goto do_stall;
1570                         ep = &udc->ep[w_index & 0xf];
1571                         if (ep != ep0) {
1572                                 if (w_index & USB_DIR_IN)
1573                                         ep += 16;
1574                                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1575                                                 || !ep->ep.desc)
1576                                         goto do_stall;
1577                                 use_ep(ep, 0);
1578                                 omap_writew(udc->clr_halt, UDC_CTRL);
1579                                 ep->ackwait = 0;
1580                                 if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1581                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1582                                         ep->ackwait = 1 + ep->double_buf;
1583                                 }
1584                                 /* NOTE:  assumes the host behaves sanely,
1585                                  * only clearing real halts.  Else we may
1586                                  * need to kill pending transfers and then
1587                                  * restart the queue... very messy for DMA!
1588                                  */
1589                         }
1590                         VDBG("%s halt cleared by host\n", ep->name);
1591                         goto ep0out_status_stage;
1592                 case USB_REQ_SET_FEATURE:
1593                         /* set endpoint halt */
1594                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1595                                 goto delegate;
1596                         if (w_value != USB_ENDPOINT_HALT
1597                                         || w_length != 0)
1598                                 goto do_stall;
1599                         ep = &udc->ep[w_index & 0xf];
1600                         if (w_index & USB_DIR_IN)
1601                                 ep += 16;
1602                         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1603                                         || ep == ep0 || !ep->ep.desc)
1604                                 goto do_stall;
1605                         if (use_dma && ep->has_dma) {
1606                                 /* this has rude side-effects (aborts) and
1607                                  * can't really work if DMA-IN is active
1608                                  */
1609                                 DBG("%s host set_halt, NYET\n", ep->name);
1610                                 goto do_stall;
1611                         }
1612                         use_ep(ep, 0);
1613                         /* can't halt if fifo isn't empty... */
1614                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1615                         omap_writew(UDC_SET_HALT, UDC_CTRL);
1616                         VDBG("%s halted by host\n", ep->name);
1617 ep0out_status_stage:
1618                         status = 0;
1619                         omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1620                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1621                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1622                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1623                         udc->ep0_pending = 0;
1624                         break;
1625                 case USB_REQ_GET_STATUS:
1626                         /* USB_ENDPOINT_HALT status? */
1627                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
1628                                 goto intf_status;
1629
1630                         /* ep0 never stalls */
1631                         if (!(w_index & 0xf))
1632                                 goto zero_status;
1633
1634                         /* only active endpoints count */
1635                         ep = &udc->ep[w_index & 0xf];
1636                         if (w_index & USB_DIR_IN)
1637                                 ep += 16;
1638                         if (!ep->ep.desc)
1639                                 goto do_stall;
1640
1641                         /* iso never stalls */
1642                         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
1643                                 goto zero_status;
1644
1645                         /* FIXME don't assume non-halted endpoints!! */
1646                         ERR("%s status, can't report\n", ep->ep.name);
1647                         goto do_stall;
1648
1649 intf_status:
1650                         /* return interface status.  if we were pedantic,
1651                          * we'd detect non-existent interfaces, and stall.
1652                          */
1653                         if (u.r.bRequestType
1654                                         != (USB_DIR_IN|USB_RECIP_INTERFACE))
1655                                 goto delegate;
1656
1657 zero_status:
1658                         /* return two zero bytes */
1659                         omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1660                         omap_writew(0, UDC_DATA);
1661                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1662                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1663                         status = 0;
1664                         VDBG("GET_STATUS, interface %d\n", w_index);
1665                         /* next, status stage */
1666                         break;
1667                 default:
1668 delegate:
1669                         /* activate the ep0out fifo right away */
1670                         if (!udc->ep0_in && w_length) {
1671                                 omap_writew(0, UDC_EP_NUM);
1672                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1673                         }
1674
1675                         /* gadget drivers see class/vendor specific requests,
1676                          * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
1677                          * and more
1678                          */
1679                         VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1680                                 u.r.bRequestType, u.r.bRequest,
1681                                 w_value, w_index, w_length);
1682
1683 #undef  w_value
1684 #undef  w_index
1685 #undef  w_length
1686
1687                         /* The gadget driver may return an error here,
1688                          * causing an immediate protocol stall.
1689                          *
1690                          * Else it must issue a response, either queueing a
1691                          * response buffer for the DATA stage, or halting ep0
1692                          * (causing a protocol stall, not a real halt).  A
1693                          * zero length buffer means no DATA stage.
1694                          *
1695                          * It's fine to issue that response after the setup()
1696                          * call returns, and this IRQ was handled.
1697                          */
1698                         udc->ep0_setup = 1;
1699                         spin_unlock(&udc->lock);
1700                         status = udc->driver->setup(&udc->gadget, &u.r);
1701                         spin_lock(&udc->lock);
1702                         udc->ep0_setup = 0;
1703                 }
1704
1705                 if (status < 0) {
1706 do_stall:
1707                         VDBG("req %02x.%02x protocol STALL; stat %d\n",
1708                                         u.r.bRequestType, u.r.bRequest, status);
1709                         if (udc->ep0_set_config) {
1710                                 if (udc->ep0_reset_config)
1711                                         WARNING("error resetting config?\n");
1712                                 else
1713                                         omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1714                         }
1715                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1716                         udc->ep0_pending = 0;
1717                 }
1718         }
1719 }
1720
1721 /*-------------------------------------------------------------------------*/
1722
1723 #define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)
1724
1725 static void devstate_irq(struct omap_udc *udc, u16 irq_src)
1726 {
1727         u16     devstat, change;
1728
1729         devstat = omap_readw(UDC_DEVSTAT);
1730         change = devstat ^ udc->devstat;
1731         udc->devstat = devstat;
1732
1733         if (change & (UDC_USB_RESET|UDC_ATT)) {
1734                 udc_quiesce(udc);
1735
1736                 if (change & UDC_ATT) {
1737                         /* driver for any external transceiver will
1738                          * have called omap_vbus_session() already
1739                          */
1740                         if (devstat & UDC_ATT) {
1741                                 udc->gadget.speed = USB_SPEED_FULL;
1742                                 VDBG("connect\n");
1743                                 if (IS_ERR_OR_NULL(udc->transceiver))
1744                                         pullup_enable(udc);
1745                                 /* if (driver->connect) call it */
1746                         } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1747                                 udc->gadget.speed = USB_SPEED_UNKNOWN;
1748                                 if (IS_ERR_OR_NULL(udc->transceiver))
1749                                         pullup_disable(udc);
1750                                 DBG("disconnect, gadget %s\n",
1751                                         udc->driver->driver.name);
1752                                 if (udc->driver->disconnect) {
1753                                         spin_unlock(&udc->lock);
1754                                         udc->driver->disconnect(&udc->gadget);
1755                                         spin_lock(&udc->lock);
1756                                 }
1757                         }
1758                         change &= ~UDC_ATT;
1759                 }
1760
1761                 if (change & UDC_USB_RESET) {
1762                         if (devstat & UDC_USB_RESET) {
1763                                 VDBG("RESET=1\n");
1764                         } else {
1765                                 udc->gadget.speed = USB_SPEED_FULL;
1766                                 INFO("USB reset done, gadget %s\n",
1767                                         udc->driver->driver.name);
1768                                 /* ep0 traffic is legal from now on */
1769                                 omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE,
1770                                                 UDC_IRQ_EN);
1771                         }
1772                         change &= ~UDC_USB_RESET;
1773                 }
1774         }
1775         if (change & UDC_SUS) {
1776                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1777                         /* FIXME tell isp1301 to suspend/resume (?) */
1778                         if (devstat & UDC_SUS) {
1779                                 VDBG("suspend\n");
1780                                 update_otg(udc);
1781                                 /* HNP could be under way already */
1782                                 if (udc->gadget.speed == USB_SPEED_FULL
1783                                                 && udc->driver->suspend) {
1784                                         spin_unlock(&udc->lock);
1785                                         udc->driver->suspend(&udc->gadget);
1786                                         spin_lock(&udc->lock);
1787                                 }
1788                                 if (!IS_ERR_OR_NULL(udc->transceiver))
1789                                         usb_phy_set_suspend(
1790                                                         udc->transceiver, 1);
1791                         } else {
1792                                 VDBG("resume\n");
1793                                 if (!IS_ERR_OR_NULL(udc->transceiver))
1794                                         usb_phy_set_suspend(
1795                                                         udc->transceiver, 0);
1796                                 if (udc->gadget.speed == USB_SPEED_FULL
1797                                                 && udc->driver->resume) {
1798                                         spin_unlock(&udc->lock);
1799                                         udc->driver->resume(&udc->gadget);
1800                                         spin_lock(&udc->lock);
1801                                 }
1802                         }
1803                 }
1804                 change &= ~UDC_SUS;
1805         }
1806         if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
1807                 update_otg(udc);
1808                 change &= ~OTG_FLAGS;
1809         }
1810
1811         change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
1812         if (change)
1813                 VDBG("devstat %03x, ignore change %03x\n",
1814                         devstat,  change);
1815
1816         omap_writew(UDC_DS_CHG, UDC_IRQ_SRC);
1817 }
1818
1819 static irqreturn_t omap_udc_irq(int irq, void *_udc)
1820 {
1821         struct omap_udc *udc = _udc;
1822         u16             irq_src;
1823         irqreturn_t     status = IRQ_NONE;
1824         unsigned long   flags;
1825
1826         spin_lock_irqsave(&udc->lock, flags);
1827         irq_src = omap_readw(UDC_IRQ_SRC);
1828
1829         /* Device state change (usb ch9 stuff) */
1830         if (irq_src & UDC_DS_CHG) {
1831                 devstate_irq(_udc, irq_src);
1832                 status = IRQ_HANDLED;
1833                 irq_src &= ~UDC_DS_CHG;
1834         }
1835
1836         /* EP0 control transfers */
1837         if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
1838                 ep0_irq(_udc, irq_src);
1839                 status = IRQ_HANDLED;
1840                 irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
1841         }
1842
1843         /* DMA transfer completion */
1844         if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
1845                 dma_irq(_udc, irq_src);
1846                 status = IRQ_HANDLED;
1847                 irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
1848         }
1849
1850         irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX);
1851         if (irq_src)
1852                 DBG("udc_irq, unhandled %03x\n", irq_src);
1853         spin_unlock_irqrestore(&udc->lock, flags);
1854
1855         return status;
1856 }
1857
1858 /* workaround for seemingly-lost IRQs for RX ACKs... */
1859 #define PIO_OUT_TIMEOUT (jiffies + HZ/3)
1860 #define HALF_FULL(f)    (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))
1861
1862 static void pio_out_timer(struct timer_list *t)
1863 {
1864         struct omap_ep  *ep = from_timer(ep, t, timer);
1865         unsigned long   flags;
1866         u16             stat_flg;
1867
1868         spin_lock_irqsave(&ep->udc->lock, flags);
1869         if (!list_empty(&ep->queue) && ep->ackwait) {
1870                 use_ep(ep, UDC_EP_SEL);
1871                 stat_flg = omap_readw(UDC_STAT_FLG);
1872
1873                 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
1874                                 || (ep->double_buf && HALF_FULL(stat_flg)))) {
1875                         struct omap_req *req;
1876
1877                         VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
1878                         req = container_of(ep->queue.next,
1879                                         struct omap_req, queue);
1880                         (void) read_fifo(ep, req);
1881                         omap_writew(ep->bEndpointAddress, UDC_EP_NUM);
1882                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1883                         ep->ackwait = 1 + ep->double_buf;
1884                 } else
1885                         deselect_ep();
1886         }
1887         mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1888         spin_unlock_irqrestore(&ep->udc->lock, flags);
1889 }
1890
1891 static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
1892 {
1893         u16             epn_stat, irq_src;
1894         irqreturn_t     status = IRQ_NONE;
1895         struct omap_ep  *ep;
1896         int             epnum;
1897         struct omap_udc *udc = _dev;
1898         struct omap_req *req;
1899         unsigned long   flags;
1900
1901         spin_lock_irqsave(&udc->lock, flags);
1902         epn_stat = omap_readw(UDC_EPN_STAT);
1903         irq_src = omap_readw(UDC_IRQ_SRC);
1904
1905         /* handle OUT first, to avoid some wasteful NAKs */
1906         if (irq_src & UDC_EPN_RX) {
1907                 epnum = (epn_stat >> 8) & 0x0f;
1908                 omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
1909                 status = IRQ_HANDLED;
1910                 ep = &udc->ep[epnum];
1911                 ep->irqs++;
1912
1913                 omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM);
1914                 ep->fnf = 0;
1915                 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
1916                         ep->ackwait--;
1917                         if (!list_empty(&ep->queue)) {
1918                                 int stat;
1919                                 req = container_of(ep->queue.next,
1920                                                 struct omap_req, queue);
1921                                 stat = read_fifo(ep, req);
1922                                 if (!ep->double_buf)
1923                                         ep->fnf = 1;
1924                         }
1925                 }
1926                 /* min 6 clock delay before clearing EP_SEL ... */
1927                 epn_stat = omap_readw(UDC_EPN_STAT);
1928                 epn_stat = omap_readw(UDC_EPN_STAT);
1929                 omap_writew(epnum, UDC_EP_NUM);
1930
1931                 /* enabling fifo _after_ clearing ACK, contrary to docs,
1932                  * reduces lossage; timer still needed though (sigh).
1933                  */
1934                 if (ep->fnf) {
1935                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1936                         ep->ackwait = 1 + ep->double_buf;
1937                 }
1938                 mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1939         }
1940
1941         /* then IN transfers */
1942         else if (irq_src & UDC_EPN_TX) {
1943                 epnum = epn_stat & 0x0f;
1944                 omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
1945                 status = IRQ_HANDLED;
1946                 ep = &udc->ep[16 + epnum];
1947                 ep->irqs++;
1948
1949                 omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM);
1950                 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
1951                         ep->ackwait = 0;
1952                         if (!list_empty(&ep->queue)) {
1953                                 req = container_of(ep->queue.next,
1954                                                 struct omap_req, queue);
1955                                 (void) write_fifo(ep, req);
1956                         }
1957                 }
1958                 /* min 6 clock delay before clearing EP_SEL ... */
1959                 epn_stat = omap_readw(UDC_EPN_STAT);
1960                 epn_stat = omap_readw(UDC_EPN_STAT);
1961                 omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM);
1962                 /* then 6 clocks before it'd tx */
1963         }
1964
1965         spin_unlock_irqrestore(&udc->lock, flags);
1966         return status;
1967 }
1968
1969 #ifdef  USE_ISO
1970 static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
1971 {
1972         struct omap_udc *udc = _dev;
1973         struct omap_ep  *ep;
1974         int             pending = 0;
1975         unsigned long   flags;
1976
1977         spin_lock_irqsave(&udc->lock, flags);
1978
1979         /* handle all non-DMA ISO transfers */
1980         list_for_each_entry(ep, &udc->iso, iso) {
1981                 u16             stat;
1982                 struct omap_req *req;
1983
1984                 if (ep->has_dma || list_empty(&ep->queue))
1985                         continue;
1986                 req = list_entry(ep->queue.next, struct omap_req, queue);
1987
1988                 use_ep(ep, UDC_EP_SEL);
1989                 stat = omap_readw(UDC_STAT_FLG);
1990
1991                 /* NOTE: like the other controller drivers, this isn't
1992                  * currently reporting lost or damaged frames.
1993                  */
1994                 if (ep->bEndpointAddress & USB_DIR_IN) {
1995                         if (stat & UDC_MISS_IN)
1996                                 /* done(ep, req, -EPROTO) */;
1997                         else
1998                                 write_fifo(ep, req);
1999                 } else {
2000                         int     status = 0;
2001
2002                         if (stat & UDC_NO_RXPACKET)
2003                                 status = -EREMOTEIO;
2004                         else if (stat & UDC_ISO_ERR)
2005                                 status = -EILSEQ;
2006                         else if (stat & UDC_DATA_FLUSH)
2007                                 status = -ENOSR;
2008
2009                         if (status)
2010                                 /* done(ep, req, status) */;
2011                         else
2012                                 read_fifo(ep, req);
2013                 }
2014                 deselect_ep();
2015                 /* 6 wait states before next EP */
2016
2017                 ep->irqs++;
2018                 if (!list_empty(&ep->queue))
2019                         pending = 1;
2020         }
2021         if (!pending) {
2022                 u16 w;
2023
2024                 w = omap_readw(UDC_IRQ_EN);
2025                 w &= ~UDC_SOF_IE;
2026                 omap_writew(w, UDC_IRQ_EN);
2027         }
2028         omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC);
2029
2030         spin_unlock_irqrestore(&udc->lock, flags);
2031         return IRQ_HANDLED;
2032 }
2033 #endif
2034
2035 /*-------------------------------------------------------------------------*/
2036
2037 static inline int machine_without_vbus_sense(void)
2038 {
2039         return  machine_is_omap_osk() || machine_is_sx1();
2040 }
2041
2042 static int omap_udc_start(struct usb_gadget *g,
2043                 struct usb_gadget_driver *driver)
2044 {
2045         int             status;
2046         struct omap_ep  *ep;
2047         unsigned long   flags;
2048
2049
2050         spin_lock_irqsave(&udc->lock, flags);
2051         /* reset state */
2052         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
2053                 ep->irqs = 0;
2054                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
2055                         continue;
2056                 use_ep(ep, 0);
2057                 omap_writew(UDC_SET_HALT, UDC_CTRL);
2058         }
2059         udc->ep0_pending = 0;
2060         udc->ep[0].irqs = 0;
2061         udc->softconnect = 1;
2062
2063         /* hook up the driver */
2064         udc->driver = driver;
2065         spin_unlock_irqrestore(&udc->lock, flags);
2066
2067         if (udc->dc_clk != NULL)
2068                 omap_udc_enable_clock(1);
2069
2070         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2071
2072         /* connect to bus through transceiver */
2073         if (!IS_ERR_OR_NULL(udc->transceiver)) {
2074                 status = otg_set_peripheral(udc->transceiver->otg,
2075                                                 &udc->gadget);
2076                 if (status < 0) {
2077                         ERR("can't bind to transceiver\n");
2078                         udc->driver = NULL;
2079                         goto done;
2080                 }
2081         } else {
2082                 status = 0;
2083                 if (can_pullup(udc))
2084                         pullup_enable(udc);
2085                 else
2086                         pullup_disable(udc);
2087         }
2088
2089         /* boards that don't have VBUS sensing can't autogate 48MHz;
2090          * can't enter deep sleep while a gadget driver is active.
2091          */
2092         if (machine_without_vbus_sense())
2093                 omap_vbus_session(&udc->gadget, 1);
2094
2095 done:
2096         if (udc->dc_clk != NULL)
2097                 omap_udc_enable_clock(0);
2098
2099         return status;
2100 }
2101
2102 static int omap_udc_stop(struct usb_gadget *g)
2103 {
2104         unsigned long   flags;
2105
2106         if (udc->dc_clk != NULL)
2107                 omap_udc_enable_clock(1);
2108
2109         if (machine_without_vbus_sense())
2110                 omap_vbus_session(&udc->gadget, 0);
2111
2112         if (!IS_ERR_OR_NULL(udc->transceiver))
2113                 (void) otg_set_peripheral(udc->transceiver->otg, NULL);
2114         else
2115                 pullup_disable(udc);
2116
2117         spin_lock_irqsave(&udc->lock, flags);
2118         udc_quiesce(udc);
2119         spin_unlock_irqrestore(&udc->lock, flags);
2120
2121         udc->driver = NULL;
2122
2123         if (udc->dc_clk != NULL)
2124                 omap_udc_enable_clock(0);
2125
2126         return 0;
2127 }
2128
2129 /*-------------------------------------------------------------------------*/
2130
2131 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
2132
2133 #include <linux/seq_file.h>
2134
2135 static const char proc_filename[] = "driver/udc";
2136
2137 #define FOURBITS "%s%s%s%s"
2138 #define EIGHTBITS "%s%s%s%s%s%s%s%s"
2139
2140 static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
2141 {
2142         u16             stat_flg;
2143         struct omap_req *req;
2144         char            buf[20];
2145
2146         use_ep(ep, 0);
2147
2148         if (use_dma && ep->has_dma)
2149                 snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
2150                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
2151                         ep->dma_channel - 1, ep->lch);
2152         else
2153                 buf[0] = 0;
2154
2155         stat_flg = omap_readw(UDC_STAT_FLG);
2156         seq_printf(s,
2157                 "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
2158                 ep->name, buf,
2159                 ep->double_buf ? "dbuf " : "",
2160                 ({ char *s;
2161                 switch (ep->ackwait) {
2162                 case 0:
2163                         s = "";
2164                         break;
2165                 case 1:
2166                         s = "(ackw) ";
2167                         break;
2168                 case 2:
2169                         s = "(ackw2) ";
2170                         break;
2171                 default:
2172                         s = "(?) ";
2173                         break;
2174                 } s; }),
2175                 ep->irqs, stat_flg,
2176                 (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
2177                 (stat_flg & UDC_MISS_IN) ? "miss_in " : "",
2178                 (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
2179                 (stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
2180                 (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
2181                 (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
2182                 (stat_flg & UDC_EP_HALTED) ? "HALT " : "",
2183                 (stat_flg & UDC_STALL) ? "STALL " : "",
2184                 (stat_flg & UDC_NAK) ? "NAK " : "",
2185                 (stat_flg & UDC_ACK) ? "ACK " : "",
2186                 (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
2187                 (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
2188                 (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");
2189
2190         if (list_empty(&ep->queue))
2191                 seq_printf(s, "\t(queue empty)\n");
2192         else
2193                 list_for_each_entry(req, &ep->queue, queue) {
2194                         unsigned        length = req->req.actual;
2195
2196                         if (use_dma && buf[0]) {
2197                                 length += ((ep->bEndpointAddress & USB_DIR_IN)
2198                                                 ? dma_src_len : dma_dest_len)
2199                                         (ep, req->req.dma + length);
2200                                 buf[0] = 0;
2201                         }
2202                         seq_printf(s, "\treq %p len %d/%d buf %p\n",
2203                                         &req->req, length,
2204                                         req->req.length, req->req.buf);
2205                 }
2206 }
2207
2208 static char *trx_mode(unsigned m, int enabled)
2209 {
2210         switch (m) {
2211         case 0:
2212                 return enabled ? "*6wire" : "unused";
2213         case 1:
2214                 return "4wire";
2215         case 2:
2216                 return "3wire";
2217         case 3:
2218                 return "6wire";
2219         default:
2220                 return "unknown";
2221         }
2222 }
2223
2224 static int proc_otg_show(struct seq_file *s)
2225 {
2226         u32             tmp;
2227         u32             trans = 0;
2228         char            *ctrl_name = "(UNKNOWN)";
2229
2230         tmp = omap_readl(OTG_REV);
2231         ctrl_name = "transceiver_ctrl";
2232         trans = omap_readw(USB_TRANSCEIVER_CTRL);
2233         seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
2234                 tmp >> 4, tmp & 0xf, ctrl_name, trans);
2235         tmp = omap_readw(OTG_SYSCON_1);
2236         seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
2237                         FOURBITS "\n", tmp,
2238                 trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
2239                 trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
2240                 (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710())
2241                         ? "internal"
2242                         : trx_mode(USB0_TRX_MODE(tmp), 1),
2243                 (tmp & OTG_IDLE_EN) ? " !otg" : "",
2244                 (tmp & HST_IDLE_EN) ? " !host" : "",
2245                 (tmp & DEV_IDLE_EN) ? " !dev" : "",
2246                 (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
2247         tmp = omap_readl(OTG_SYSCON_2);
2248         seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
2249                         " b_ase_brst=%d hmc=%d\n", tmp,
2250                 (tmp & OTG_EN) ? " otg_en" : "",
2251                 (tmp & USBX_SYNCHRO) ? " synchro" : "",
2252                 /* much more SRP stuff */
2253                 (tmp & SRP_DATA) ? " srp_data" : "",
2254                 (tmp & SRP_VBUS) ? " srp_vbus" : "",
2255                 (tmp & OTG_PADEN) ? " otg_paden" : "",
2256                 (tmp & HMC_PADEN) ? " hmc_paden" : "",
2257                 (tmp & UHOST_EN) ? " uhost_en" : "",
2258                 (tmp & HMC_TLLSPEED) ? " tllspeed" : "",
2259                 (tmp & HMC_TLLATTACH) ? " tllattach" : "",
2260                 B_ASE_BRST(tmp),
2261                 OTG_HMC(tmp));
2262         tmp = omap_readl(OTG_CTRL);
2263         seq_printf(s, "otg_ctrl    %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
2264                 (tmp & OTG_ASESSVLD) ? " asess" : "",
2265                 (tmp & OTG_BSESSEND) ? " bsess_end" : "",
2266                 (tmp & OTG_BSESSVLD) ? " bsess" : "",
2267                 (tmp & OTG_VBUSVLD) ? " vbus" : "",
2268                 (tmp & OTG_ID) ? " id" : "",
2269                 (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
2270                 (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
2271                 (tmp & OTG_A_BUSREQ) ? " a_bus" : "",
2272                 (tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
2273                 (tmp & OTG_B_BUSREQ) ? " b_bus" : "",
2274                 (tmp & OTG_BUSDROP) ? " busdrop" : "",
2275                 (tmp & OTG_PULLDOWN) ? " down" : "",
2276                 (tmp & OTG_PULLUP) ? " up" : "",
2277                 (tmp & OTG_DRV_VBUS) ? " drv" : "",
2278                 (tmp & OTG_PD_VBUS) ? " pd_vb" : "",
2279                 (tmp & OTG_PU_VBUS) ? " pu_vb" : "",
2280                 (tmp & OTG_PU_ID) ? " pu_id" : ""
2281                 );
2282         tmp = omap_readw(OTG_IRQ_EN);
2283         seq_printf(s, "otg_irq_en  %04x" "\n", tmp);
2284         tmp = omap_readw(OTG_IRQ_SRC);
2285         seq_printf(s, "otg_irq_src %04x" "\n", tmp);
2286         tmp = omap_readw(OTG_OUTCTRL);
2287         seq_printf(s, "otg_outctrl %04x" "\n", tmp);
2288         tmp = omap_readw(OTG_TEST);
2289         seq_printf(s, "otg_test    %04x" "\n", tmp);
2290         return 0;
2291 }
2292
2293 static int proc_udc_show(struct seq_file *s, void *_)
2294 {
2295         u32             tmp;
2296         struct omap_ep  *ep;
2297         unsigned long   flags;
2298
2299         spin_lock_irqsave(&udc->lock, flags);
2300
2301         seq_printf(s, "%s, version: " DRIVER_VERSION
2302 #ifdef  USE_ISO
2303                 " (iso)"
2304 #endif
2305                 "%s\n",
2306                 driver_desc,
2307                 use_dma ?  " (dma)" : "");
2308
2309         tmp = omap_readw(UDC_REV) & 0xff;
2310         seq_printf(s,
2311                 "UDC rev %d.%d, fifo mode %d, gadget %s\n"
2312                 "hmc %d, transceiver %s\n",
2313                 tmp >> 4, tmp & 0xf,
2314                 fifo_mode,
2315                 udc->driver ? udc->driver->driver.name : "(none)",
2316                 HMC,
2317                 udc->transceiver
2318                         ? udc->transceiver->label
2319                         : (cpu_is_omap1710()
2320                                 ? "external" : "(none)"));
2321         seq_printf(s, "ULPD control %04x req %04x status %04x\n",
2322                 omap_readw(ULPD_CLOCK_CTRL),
2323                 omap_readw(ULPD_SOFT_REQ),
2324                 omap_readw(ULPD_STATUS_REQ));
2325
2326         /* OTG controller registers */
2327         if (!cpu_is_omap15xx())
2328                 proc_otg_show(s);
2329
2330         tmp = omap_readw(UDC_SYSCON1);
2331         seq_printf(s, "\nsyscon1     %04x" EIGHTBITS "\n", tmp,
2332                 (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
2333                 (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
2334                 (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
2335                 (tmp & UDC_NAK_EN) ? " nak" : "",
2336                 (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
2337                 (tmp & UDC_SELF_PWR) ? " self_pwr" : "",
2338                 (tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
2339                 (tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
2340         /* syscon2 is write-only */
2341
2342         /* UDC controller registers */
2343         if (!(tmp & UDC_PULLUP_EN)) {
2344                 seq_printf(s, "(suspended)\n");
2345                 spin_unlock_irqrestore(&udc->lock, flags);
2346                 return 0;
2347         }
2348
2349         tmp = omap_readw(UDC_DEVSTAT);
2350         seq_printf(s, "devstat     %04x" EIGHTBITS "%s%s\n", tmp,
2351                 (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
2352                 (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
2353                 (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
2354                 (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
2355                 (tmp & UDC_USB_RESET) ? " usb_reset" : "",
2356                 (tmp & UDC_SUS) ? " SUS" : "",
2357                 (tmp & UDC_CFG) ? " CFG" : "",
2358                 (tmp & UDC_ADD) ? " ADD" : "",
2359                 (tmp & UDC_DEF) ? " DEF" : "",
2360                 (tmp & UDC_ATT) ? " ATT" : "");
2361         seq_printf(s, "sof         %04x\n", omap_readw(UDC_SOF));
2362         tmp = omap_readw(UDC_IRQ_EN);
2363         seq_printf(s, "irq_en      %04x" FOURBITS "%s\n", tmp,
2364                 (tmp & UDC_SOF_IE) ? " sof" : "",
2365                 (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
2366                 (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
2367                 (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
2368                 (tmp & UDC_EP0_IE) ? " ep0" : "");
2369         tmp = omap_readw(UDC_IRQ_SRC);
2370         seq_printf(s, "irq_src     %04x" EIGHTBITS "%s%s\n", tmp,
2371                 (tmp & UDC_TXN_DONE) ? " txn_done" : "",
2372                 (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
2373                 (tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
2374                 (tmp & UDC_IRQ_SOF) ? " sof" : "",
2375                 (tmp & UDC_EPN_RX) ? " epn_rx" : "",
2376                 (tmp & UDC_EPN_TX) ? " epn_tx" : "",
2377                 (tmp & UDC_DS_CHG) ? " ds_chg" : "",
2378                 (tmp & UDC_SETUP) ? " setup" : "",
2379                 (tmp & UDC_EP0_RX) ? " ep0out" : "",
2380                 (tmp & UDC_EP0_TX) ? " ep0in" : "");
2381         if (use_dma) {
2382                 unsigned i;
2383
2384                 tmp = omap_readw(UDC_DMA_IRQ_EN);
2385                 seq_printf(s, "dma_irq_en  %04x%s" EIGHTBITS "\n", tmp,
2386                         (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
2387                         (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
2388                         (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",
2389
2390                         (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
2391                         (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
2392                         (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",
2393
2394                         (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
2395                         (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
2396                         (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
2397
2398                 tmp = omap_readw(UDC_RXDMA_CFG);
2399                 seq_printf(s, "rxdma_cfg   %04x\n", tmp);
2400                 if (tmp) {
2401                         for (i = 0; i < 3; i++) {
2402                                 if ((tmp & (0x0f << (i * 4))) == 0)
2403                                         continue;
2404                                 seq_printf(s, "rxdma[%d]    %04x\n", i,
2405                                                 omap_readw(UDC_RXDMA(i + 1)));
2406                         }
2407                 }
2408                 tmp = omap_readw(UDC_TXDMA_CFG);
2409                 seq_printf(s, "txdma_cfg   %04x\n", tmp);
2410                 if (tmp) {
2411                         for (i = 0; i < 3; i++) {
2412                                 if (!(tmp & (0x0f << (i * 4))))
2413                                         continue;
2414                                 seq_printf(s, "txdma[%d]    %04x\n", i,
2415                                                 omap_readw(UDC_TXDMA(i + 1)));
2416                         }
2417                 }
2418         }
2419
2420         tmp = omap_readw(UDC_DEVSTAT);
2421         if (tmp & UDC_ATT) {
2422                 proc_ep_show(s, &udc->ep[0]);
2423                 if (tmp & UDC_ADD) {
2424                         list_for_each_entry(ep, &udc->gadget.ep_list,
2425                                         ep.ep_list) {
2426                                 if (ep->ep.desc)
2427                                         proc_ep_show(s, ep);
2428                         }
2429                 }
2430         }
2431         spin_unlock_irqrestore(&udc->lock, flags);
2432         return 0;
2433 }
2434
2435 static void create_proc_file(void)
2436 {
2437         proc_create_single(proc_filename, 0, NULL, proc_udc_show);
2438 }
2439
2440 static void remove_proc_file(void)
2441 {
2442         remove_proc_entry(proc_filename, NULL);
2443 }
2444
2445 #else
2446
2447 static inline void create_proc_file(void) {}
2448 static inline void remove_proc_file(void) {}
2449
2450 #endif
2451
2452 /*-------------------------------------------------------------------------*/
2453
2454 /* Before this controller can enumerate, we need to pick an endpoint
2455  * configuration, or "fifo_mode"  That involves allocating 2KB of packet
2456  * buffer space among the endpoints we'll be operating.
2457  *
2458  * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
2459  * UDC_SYSCON_1.CFG_LOCK is set can now work.  We won't use that
2460  * capability yet though.
2461  */
2462 static unsigned
2463 omap_ep_setup(char *name, u8 addr, u8 type,
2464                 unsigned buf, unsigned maxp, int dbuf)
2465 {
2466         struct omap_ep  *ep;
2467         u16             epn_rxtx = 0;
2468
2469         /* OUT endpoints first, then IN */
2470         ep = &udc->ep[addr & 0xf];
2471         if (addr & USB_DIR_IN)
2472                 ep += 16;
2473
2474         /* in case of ep init table bugs */
2475         BUG_ON(ep->name[0]);
2476
2477         /* chip setup ... bit values are same for IN, OUT */
2478         if (type == USB_ENDPOINT_XFER_ISOC) {
2479                 switch (maxp) {
2480                 case 8:
2481                         epn_rxtx = 0 << 12;
2482                         break;
2483                 case 16:
2484                         epn_rxtx = 1 << 12;
2485                         break;
2486                 case 32:
2487                         epn_rxtx = 2 << 12;
2488                         break;
2489                 case 64:
2490                         epn_rxtx = 3 << 12;
2491                         break;
2492                 case 128:
2493                         epn_rxtx = 4 << 12;
2494                         break;
2495                 case 256:
2496                         epn_rxtx = 5 << 12;
2497                         break;
2498                 case 512:
2499                         epn_rxtx = 6 << 12;
2500                         break;
2501                 default:
2502                         BUG();
2503                 }
2504                 epn_rxtx |= UDC_EPN_RX_ISO;
2505                 dbuf = 1;
2506         } else {
2507                 /* double-buffering "not supported" on 15xx,
2508                  * and ignored for PIO-IN on newer chips
2509                  * (for more reliable behavior)
2510                  */
2511                 if (!use_dma || cpu_is_omap15xx())
2512                         dbuf = 0;
2513
2514                 switch (maxp) {
2515                 case 8:
2516                         epn_rxtx = 0 << 12;
2517                         break;
2518                 case 16:
2519                         epn_rxtx = 1 << 12;
2520                         break;
2521                 case 32:
2522                         epn_rxtx = 2 << 12;
2523                         break;
2524                 case 64:
2525                         epn_rxtx = 3 << 12;
2526                         break;
2527                 default:
2528                         BUG();
2529                 }
2530                 if (dbuf && addr)
2531                         epn_rxtx |= UDC_EPN_RX_DB;
2532                 timer_setup(&ep->timer, pio_out_timer, 0);
2533         }
2534         if (addr)
2535                 epn_rxtx |= UDC_EPN_RX_VALID;
2536         BUG_ON(buf & 0x07);
2537         epn_rxtx |= buf >> 3;
2538
2539         DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
2540                 name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
2541
2542         if (addr & USB_DIR_IN)
2543                 omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf));
2544         else
2545                 omap_writew(epn_rxtx, UDC_EP_RX(addr));
2546
2547         /* next endpoint's buffer starts after this one's */
2548         buf += maxp;
2549         if (dbuf)
2550                 buf += maxp;
2551         BUG_ON(buf > 2048);
2552
2553         /* set up driver data structures */
2554         BUG_ON(strlen(name) >= sizeof ep->name);
2555         strscpy(ep->name, name, sizeof(ep->name));
2556         INIT_LIST_HEAD(&ep->queue);
2557         INIT_LIST_HEAD(&ep->iso);
2558         ep->bEndpointAddress = addr;
2559         ep->bmAttributes = type;
2560         ep->double_buf = dbuf;
2561         ep->udc = udc;
2562
2563         switch (type) {
2564         case USB_ENDPOINT_XFER_CONTROL:
2565                 ep->ep.caps.type_control = true;
2566                 ep->ep.caps.dir_in = true;
2567                 ep->ep.caps.dir_out = true;
2568                 break;
2569         case USB_ENDPOINT_XFER_ISOC:
2570                 ep->ep.caps.type_iso = true;
2571                 break;
2572         case USB_ENDPOINT_XFER_BULK:
2573                 ep->ep.caps.type_bulk = true;
2574                 break;
2575         case USB_ENDPOINT_XFER_INT:
2576                 ep->ep.caps.type_int = true;
2577                 break;
2578         }
2579
2580         if (addr & USB_DIR_IN)
2581                 ep->ep.caps.dir_in = true;
2582         else
2583                 ep->ep.caps.dir_out = true;
2584
2585         ep->ep.name = ep->name;
2586         ep->ep.ops = &omap_ep_ops;
2587         ep->maxpacket = maxp;
2588         usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
2589         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2590
2591         return buf;
2592 }
2593
2594 static void omap_udc_release(struct device *dev)
2595 {
2596         pullup_disable(udc);
2597         if (!IS_ERR_OR_NULL(udc->transceiver)) {
2598                 usb_put_phy(udc->transceiver);
2599                 udc->transceiver = NULL;
2600         }
2601         omap_writew(0, UDC_SYSCON1);
2602         remove_proc_file();
2603         if (udc->dc_clk) {
2604                 if (udc->clk_requested)
2605                         omap_udc_enable_clock(0);
2606                 clk_unprepare(udc->hhc_clk);
2607                 clk_unprepare(udc->dc_clk);
2608                 clk_put(udc->hhc_clk);
2609                 clk_put(udc->dc_clk);
2610         }
2611         if (udc->done)
2612                 complete(udc->done);
2613         kfree(udc);
2614 }
2615
2616 static int
2617 omap_udc_setup(struct platform_device *odev, struct usb_phy *xceiv)
2618 {
2619         unsigned        tmp, buf;
2620
2621         /* abolish any previous hardware state */
2622         omap_writew(0, UDC_SYSCON1);
2623         omap_writew(0, UDC_IRQ_EN);
2624         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2625         omap_writew(0, UDC_DMA_IRQ_EN);
2626         omap_writew(0, UDC_RXDMA_CFG);
2627         omap_writew(0, UDC_TXDMA_CFG);
2628
2629         /* UDC_PULLUP_EN gates the chip clock */
2630         /* OTG_SYSCON_1 |= DEV_IDLE_EN; */
2631
2632         udc = kzalloc(sizeof(*udc), GFP_KERNEL);
2633         if (!udc)
2634                 return -ENOMEM;
2635
2636         spin_lock_init(&udc->lock);
2637
2638         udc->gadget.ops = &omap_gadget_ops;
2639         udc->gadget.ep0 = &udc->ep[0].ep;
2640         INIT_LIST_HEAD(&udc->gadget.ep_list);
2641         INIT_LIST_HEAD(&udc->iso);
2642         udc->gadget.speed = USB_SPEED_UNKNOWN;
2643         udc->gadget.max_speed = USB_SPEED_FULL;
2644         udc->gadget.name = driver_name;
2645         udc->gadget.quirk_ep_out_aligned_size = 1;
2646         udc->transceiver = xceiv;
2647
2648         /* ep0 is special; put it right after the SETUP buffer */
2649         buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
2650                         8 /* after SETUP */, 64 /* maxpacket */, 0);
2651         list_del_init(&udc->ep[0].ep.ep_list);
2652
2653         /* initially disable all non-ep0 endpoints */
2654         for (tmp = 1; tmp < 15; tmp++) {
2655                 omap_writew(0, UDC_EP_RX(tmp));
2656                 omap_writew(0, UDC_EP_TX(tmp));
2657         }
2658
2659 #define OMAP_BULK_EP(name, addr) \
2660         buf = omap_ep_setup(name "-bulk", addr, \
2661                         USB_ENDPOINT_XFER_BULK, buf, 64, 1);
2662 #define OMAP_INT_EP(name, addr, maxp) \
2663         buf = omap_ep_setup(name "-int", addr, \
2664                         USB_ENDPOINT_XFER_INT, buf, maxp, 0);
2665 #define OMAP_ISO_EP(name, addr, maxp) \
2666         buf = omap_ep_setup(name "-iso", addr, \
2667                         USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);
2668
2669         switch (fifo_mode) {
2670         case 0:
2671                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2672                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2673                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2674                 break;
2675         case 1:
2676                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2677                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2678                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2679
2680                 OMAP_BULK_EP("ep3in",  USB_DIR_IN  | 3);
2681                 OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);
2682                 OMAP_INT_EP("ep10in",  USB_DIR_IN  | 10, 16);
2683
2684                 OMAP_BULK_EP("ep5in",  USB_DIR_IN  | 5);
2685                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2686                 OMAP_INT_EP("ep11in",  USB_DIR_IN  | 11, 16);
2687
2688                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2689                 OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);
2690                 OMAP_INT_EP("ep12in",  USB_DIR_IN  | 12, 16);
2691
2692                 OMAP_BULK_EP("ep7in",  USB_DIR_IN  | 7);
2693                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2694                 OMAP_INT_EP("ep13in",  USB_DIR_IN  | 13, 16);
2695                 OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16);
2696
2697                 OMAP_BULK_EP("ep8in",  USB_DIR_IN  | 8);
2698                 OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);
2699                 OMAP_INT_EP("ep14in",  USB_DIR_IN  | 14, 16);
2700                 OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16);
2701
2702                 OMAP_BULK_EP("ep15in",  USB_DIR_IN  | 15);
2703                 OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15);
2704
2705                 break;
2706
2707 #ifdef  USE_ISO
2708         case 2:                 /* mixed iso/bulk */
2709                 OMAP_ISO_EP("ep1in",   USB_DIR_IN  | 1, 256);
2710                 OMAP_ISO_EP("ep2out",  USB_DIR_OUT | 2, 256);
2711                 OMAP_ISO_EP("ep3in",   USB_DIR_IN  | 3, 128);
2712                 OMAP_ISO_EP("ep4out",  USB_DIR_OUT | 4, 128);
2713
2714                 OMAP_INT_EP("ep5in",   USB_DIR_IN  | 5, 16);
2715
2716                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2717                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2718                 OMAP_INT_EP("ep8in",   USB_DIR_IN  | 8, 16);
2719                 break;
2720         case 3:                 /* mixed bulk/iso */
2721                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2722                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2723                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2724
2725                 OMAP_BULK_EP("ep4in",  USB_DIR_IN  | 4);
2726                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2727                 OMAP_INT_EP("ep6in",   USB_DIR_IN  | 6, 16);
2728
2729                 OMAP_ISO_EP("ep7in",   USB_DIR_IN  | 7, 256);
2730                 OMAP_ISO_EP("ep8out",  USB_DIR_OUT | 8, 256);
2731                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2732                 break;
2733 #endif
2734
2735         /* add more modes as needed */
2736
2737         default:
2738                 ERR("unsupported fifo_mode #%d\n", fifo_mode);
2739                 return -ENODEV;
2740         }
2741         omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1);
2742         INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
2743         return 0;
2744 }
2745
2746 static int omap_udc_probe(struct platform_device *pdev)
2747 {
2748         int                     status = -ENODEV;
2749         int                     hmc;
2750         struct usb_phy          *xceiv = NULL;
2751         const char              *type = NULL;
2752         struct omap_usb_config  *config = dev_get_platdata(&pdev->dev);
2753         struct clk              *dc_clk = NULL;
2754         struct clk              *hhc_clk = NULL;
2755
2756         /* NOTE:  "knows" the order of the resources! */
2757         if (!request_mem_region(pdev->resource[0].start,
2758                         resource_size(&pdev->resource[0]),
2759                         driver_name)) {
2760                 DBG("request_mem_region failed\n");
2761                 return -EBUSY;
2762         }
2763
2764         if (cpu_is_omap16xx()) {
2765                 dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
2766                 hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
2767                 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
2768                 /* can't use omap_udc_enable_clock yet */
2769                 clk_prepare_enable(dc_clk);
2770                 clk_prepare_enable(hhc_clk);
2771                 udelay(100);
2772         }
2773
2774         INFO("OMAP UDC rev %d.%d%s\n",
2775                 omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
2776                 config->otg ? ", Mini-AB" : "");
2777
2778         /* use the mode given to us by board init code */
2779         if (cpu_is_omap15xx()) {
2780                 hmc = HMC_1510;
2781                 type = "(unknown)";
2782
2783                 if (machine_without_vbus_sense()) {
2784                         /* just set up software VBUS detect, and then
2785                          * later rig it so we always report VBUS.
2786                          * FIXME without really sensing VBUS, we can't
2787                          * know when to turn PULLUP_EN on/off; and that
2788                          * means we always "need" the 48MHz clock.
2789                          */
2790                         u32 tmp = omap_readl(FUNC_MUX_CTRL_0);
2791                         tmp &= ~VBUS_CTRL_1510;
2792                         omap_writel(tmp, FUNC_MUX_CTRL_0);
2793                         tmp |= VBUS_MODE_1510;
2794                         tmp &= ~VBUS_CTRL_1510;
2795                         omap_writel(tmp, FUNC_MUX_CTRL_0);
2796                 }
2797         } else {
2798                 /* The transceiver may package some GPIO logic or handle
2799                  * loopback and/or transceiverless setup; if we find one,
2800                  * use it.  Except for OTG, we don't _need_ to talk to one;
2801                  * but not having one probably means no VBUS detection.
2802                  */
2803                 xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
2804                 if (!IS_ERR_OR_NULL(xceiv))
2805                         type = xceiv->label;
2806                 else if (config->otg) {
2807                         DBG("OTG requires external transceiver!\n");
2808                         goto cleanup0;
2809                 }
2810
2811                 hmc = HMC_1610;
2812
2813                 switch (hmc) {
2814                 case 0:                 /* POWERUP DEFAULT == 0 */
2815                 case 4:
2816                 case 12:
2817                 case 20:
2818                         if (!cpu_is_omap1710()) {
2819                                 type = "integrated";
2820                                 break;
2821                         }
2822                         fallthrough;
2823                 case 3:
2824                 case 11:
2825                 case 16:
2826                 case 19:
2827                 case 25:
2828                         if (IS_ERR_OR_NULL(xceiv)) {
2829                                 DBG("external transceiver not registered!\n");
2830                                 type = "unknown";
2831                         }
2832                         break;
2833                 case 21:                        /* internal loopback */
2834                         type = "loopback";
2835                         break;
2836                 case 14:                        /* transceiverless */
2837                         if (cpu_is_omap1710())
2838                                 goto bad_on_1710;
2839                         fallthrough;
2840                 case 13:
2841                 case 15:
2842                         type = "no";
2843                         break;
2844
2845                 default:
2846 bad_on_1710:
2847                         ERR("unrecognized UDC HMC mode %d\n", hmc);
2848                         goto cleanup0;
2849                 }
2850         }
2851
2852         INFO("hmc mode %d, %s transceiver\n", hmc, type);
2853
2854         /* a "gadget" abstracts/virtualizes the controller */
2855         status = omap_udc_setup(pdev, xceiv);
2856         if (status)
2857                 goto cleanup0;
2858
2859         xceiv = NULL;
2860         /* "udc" is now valid */
2861         pullup_disable(udc);
2862 #if     IS_ENABLED(CONFIG_USB_OHCI_HCD)
2863         udc->gadget.is_otg = (config->otg != 0);
2864 #endif
2865
2866         /* starting with omap1710 es2.0, clear toggle is a separate bit */
2867         if (omap_readw(UDC_REV) >= 0x61)
2868                 udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
2869         else
2870                 udc->clr_halt = UDC_RESET_EP;
2871
2872         /* USB general purpose IRQ:  ep0, state changes, dma, etc */
2873         status = devm_request_irq(&pdev->dev, pdev->resource[1].start,
2874                                   omap_udc_irq, 0, driver_name, udc);
2875         if (status != 0) {
2876                 ERR("can't get irq %d, err %d\n",
2877                         (int) pdev->resource[1].start, status);
2878                 goto cleanup1;
2879         }
2880
2881         /* USB "non-iso" IRQ (PIO for all but ep0) */
2882         status = devm_request_irq(&pdev->dev, pdev->resource[2].start,
2883                                   omap_udc_pio_irq, 0, "omap_udc pio", udc);
2884         if (status != 0) {
2885                 ERR("can't get irq %d, err %d\n",
2886                         (int) pdev->resource[2].start, status);
2887                 goto cleanup1;
2888         }
2889 #ifdef  USE_ISO
2890         status = devm_request_irq(&pdev->dev, pdev->resource[3].start,
2891                                   omap_udc_iso_irq, 0, "omap_udc iso", udc);
2892         if (status != 0) {
2893                 ERR("can't get irq %d, err %d\n",
2894                         (int) pdev->resource[3].start, status);
2895                 goto cleanup1;
2896         }
2897 #endif
2898         if (cpu_is_omap16xx()) {
2899                 udc->dc_clk = dc_clk;
2900                 udc->hhc_clk = hhc_clk;
2901                 clk_disable(hhc_clk);
2902                 clk_disable(dc_clk);
2903         }
2904
2905         create_proc_file();
2906         return usb_add_gadget_udc_release(&pdev->dev, &udc->gadget,
2907                                           omap_udc_release);
2908
2909 cleanup1:
2910         kfree(udc);
2911         udc = NULL;
2912
2913 cleanup0:
2914         if (!IS_ERR_OR_NULL(xceiv))
2915                 usb_put_phy(xceiv);
2916
2917         if (cpu_is_omap16xx()) {
2918                 clk_disable_unprepare(hhc_clk);
2919                 clk_disable_unprepare(dc_clk);
2920                 clk_put(hhc_clk);
2921                 clk_put(dc_clk);
2922         }
2923
2924         release_mem_region(pdev->resource[0].start,
2925                            resource_size(&pdev->resource[0]));
2926
2927         return status;
2928 }
2929
2930 static int omap_udc_remove(struct platform_device *pdev)
2931 {
2932         DECLARE_COMPLETION_ONSTACK(done);
2933
2934         udc->done = &done;
2935
2936         usb_del_gadget_udc(&udc->gadget);
2937
2938         wait_for_completion(&done);
2939
2940         release_mem_region(pdev->resource[0].start,
2941                            resource_size(&pdev->resource[0]));
2942
2943         return 0;
2944 }
2945
2946 /* suspend/resume/wakeup from sysfs (echo > power/state) or when the
2947  * system is forced into deep sleep
2948  *
2949  * REVISIT we should probably reject suspend requests when there's a host
2950  * session active, rather than disconnecting, at least on boards that can
2951  * report VBUS irqs (UDC_DEVSTAT.UDC_ATT).  And in any case, we need to
2952  * make host resumes and VBUS detection trigger OMAP wakeup events; that
2953  * may involve talking to an external transceiver (e.g. isp1301).
2954  */
2955
2956 static int omap_udc_suspend(struct platform_device *dev, pm_message_t message)
2957 {
2958         u32     devstat;
2959
2960         devstat = omap_readw(UDC_DEVSTAT);
2961
2962         /* we're requesting 48 MHz clock if the pullup is enabled
2963          * (== we're attached to the host) and we're not suspended,
2964          * which would prevent entry to deep sleep...
2965          */
2966         if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) {
2967                 WARNING("session active; suspend requires disconnect\n");
2968                 omap_pullup(&udc->gadget, 0);
2969         }
2970
2971         return 0;
2972 }
2973
2974 static int omap_udc_resume(struct platform_device *dev)
2975 {
2976         DBG("resume + wakeup/SRP\n");
2977         omap_pullup(&udc->gadget, 1);
2978
2979         /* maybe the host would enumerate us if we nudged it */
2980         msleep(100);
2981         return omap_wakeup(&udc->gadget);
2982 }
2983
2984 /*-------------------------------------------------------------------------*/
2985
2986 static struct platform_driver udc_driver = {
2987         .probe          = omap_udc_probe,
2988         .remove         = omap_udc_remove,
2989         .suspend        = omap_udc_suspend,
2990         .resume         = omap_udc_resume,
2991         .driver         = {
2992                 .name   = driver_name,
2993         },
2994 };
2995
2996 module_platform_driver(udc_driver);
2997
2998 MODULE_DESCRIPTION(DRIVER_DESC);
2999 MODULE_LICENSE("GPL");
3000 MODULE_ALIAS("platform:omap_udc");