drivers/usb/chipidea/udc.c

   1 /*
   2  * udc.c - ChipIdea UDC driver
   3  *
   4  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   5  *
   6  * Author: David Lopo
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/dmapool.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/module.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/irq.h>
  24 #include <linux/kernel.h>
  25 #include <linux/slab.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/usb/ch9.h>
  28 #include <linux/usb/gadget.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/usb/chipidea.h>
  31
  32 #include "ci.h"
  33 #include "udc.h"
  34 #include "bits.h"
  35 #include "debug.h"
  36
  37 /* control endpoint description */
  38 static const struct usb_endpoint_descriptor
  39 ctrl_endpt_out_desc = {
  40         .bLength         = USB_DT_ENDPOINT_SIZE,
  41         .bDescriptorType = USB_DT_ENDPOINT,
  42
  43         .bEndpointAddress = USB_DIR_OUT,
  44         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  45         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  46 };
  47
  48 static const struct usb_endpoint_descriptor
  49 ctrl_endpt_in_desc = {
  50         .bLength         = USB_DT_ENDPOINT_SIZE,
  51         .bDescriptorType = USB_DT_ENDPOINT,
  52
  53         .bEndpointAddress = USB_DIR_IN,
  54         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  55         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  56 };
  57
  58 /**
  59  * hw_ep_bit: calculates the bit number
  60  * @num: endpoint number
  61  * @dir: endpoint direction
  62  *
  63  * This function returns bit number
  64  */
  65 static inline int hw_ep_bit(int num, int dir)
  66 {
  67         return num + (dir ? 16 : 0);
  68 }
  69
  70 static inline int ep_to_bit(struct ci13xxx *ci, int n)
  71 {
  72         int fill = 16 - ci->hw_ep_max / 2;
  73
  74         if (n >= ci->hw_ep_max / 2)
  75                 n += fill;
  76
  77         return n;
  78 }
  79
  80 /**
  81  * hw_device_state: enables/disables interrupts (execute without interruption)
  82  * @dma: 0 => disable, !0 => enable and set dma engine
  83  *
  84  * This function returns an error code
  85  */
  86 static int hw_device_state(struct ci13xxx *ci, u32 dma)
  87 {
  88         if (dma) {
  89                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  90                 /* interrupt, error, port change, reset, sleep/suspend */
  91                 hw_write(ci, OP_USBINTR, ~0,
  92                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  93         } else {
  94                 hw_write(ci, OP_USBINTR, ~0, 0);
  95         }
  96         return 0;
  97 }
  98
  99 /**
 100  * hw_ep_flush: flush endpoint fifo (execute without interruption)
 101  * @num: endpoint number
 102  * @dir: endpoint direction
 103  *
 104  * This function returns an error code
 105  */
 106 static int hw_ep_flush(struct ci13xxx *ci, int num, int dir)
 107 {
 108         int n = hw_ep_bit(num, dir);
 109
 110         do {
 111                 /* flush any pending transfer */
 112                 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
 113                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 114                         cpu_relax();
 115         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 116
 117         return 0;
 118 }
 119
 120 /**
 121  * hw_ep_disable: disables endpoint (execute without interruption)
 122  * @num: endpoint number
 123  * @dir: endpoint direction
 124  *
 125  * This function returns an error code
 126  */
 127 static int hw_ep_disable(struct ci13xxx *ci, int num, int dir)
 128 {
 129         hw_ep_flush(ci, num, dir);
 130         hw_write(ci, OP_ENDPTCTRL + num,
 131                  dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 132         return 0;
 133 }
 134
 135 /**
 136  * hw_ep_enable: enables endpoint (execute without interruption)
 137  * @num:  endpoint number
 138  * @dir:  endpoint direction
 139  * @type: endpoint type
 140  *
 141  * This function returns an error code
 142  */
 143 static int hw_ep_enable(struct ci13xxx *ci, int num, int dir, int type)
 144 {
 145         u32 mask, data;
 146
 147         if (dir) {
 148                 mask  = ENDPTCTRL_TXT;  /* type    */
 149                 data  = type << ffs_nr(mask);
 150
 151                 mask |= ENDPTCTRL_TXS;  /* unstall */
 152                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 153                 data |= ENDPTCTRL_TXR;
 154                 mask |= ENDPTCTRL_TXE;  /* enable  */
 155                 data |= ENDPTCTRL_TXE;
 156         } else {
 157                 mask  = ENDPTCTRL_RXT;  /* type    */
 158                 data  = type << ffs_nr(mask);
 159
 160                 mask |= ENDPTCTRL_RXS;  /* unstall */
 161                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 162                 data |= ENDPTCTRL_RXR;
 163                 mask |= ENDPTCTRL_RXE;  /* enable  */
 164                 data |= ENDPTCTRL_RXE;
 165         }
 166         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 167         return 0;
 168 }
 169
 170 /**
 171  * hw_ep_get_halt: return endpoint halt status
 172  * @num: endpoint number
 173  * @dir: endpoint direction
 174  *
 175  * This function returns 1 if endpoint halted
 176  */
 177 static int hw_ep_get_halt(struct ci13xxx *ci, int num, int dir)
 178 {
 179         u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 180
 181         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 182 }
 183
 184 /**
 185  * hw_test_and_clear_setup_status: test & clear setup status (execute without
 186  *                                 interruption)
 187  * @n: endpoint number
 188  *
 189  * This function returns setup status
 190  */
 191 static int hw_test_and_clear_setup_status(struct ci13xxx *ci, int n)
 192 {
 193         n = ep_to_bit(ci, n);
 194         return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n));
 195 }
 196
 197 /**
 198  * hw_ep_prime: primes endpoint (execute without interruption)
 199  * @num:     endpoint number
 200  * @dir:     endpoint direction
 201  * @is_ctrl: true if control endpoint
 202  *
 203  * This function returns an error code
 204  */
 205 static int hw_ep_prime(struct ci13xxx *ci, int num, int dir, int is_ctrl)
 206 {
 207         int n = hw_ep_bit(num, dir);
 208
 209         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 210                 return -EAGAIN;
 211
 212         hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
 213
 214         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 215                 cpu_relax();
 216         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 217                 return -EAGAIN;
 218
 219         /* status shoult be tested according with manual but it doesn't work */
 220         return 0;
 221 }
 222
 223 /**
 224  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 225  *                 without interruption)
 226  * @num:   endpoint number
 227  * @dir:   endpoint direction
 228  * @value: true => stall, false => unstall
 229  *
 230  * This function returns an error code
 231  */
 232 static int hw_ep_set_halt(struct ci13xxx *ci, int num, int dir, int value)
 233 {
 234         if (value != 0 && value != 1)
 235                 return -EINVAL;
 236
 237         do {
 238                 enum ci13xxx_regs reg = OP_ENDPTCTRL + num;
 239                 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 240                 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 241
 242                 /* data toggle - reserved for EP0 but it's in ESS */
 243                 hw_write(ci, reg, mask_xs|mask_xr,
 244                           value ? mask_xs : mask_xr);
 245         } while (value != hw_ep_get_halt(ci, num, dir));
 246
 247         return 0;
 248 }
 249
 250 /**
 251  * hw_is_port_high_speed: test if port is high speed
 252  *
 253  * This function returns true if high speed port
 254  */
 255 static int hw_port_is_high_speed(struct ci13xxx *ci)
 256 {
 257         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 258                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 259 }
 260
 261 /**
 262  * hw_read_intr_enable: returns interrupt enable register
 263  *
 264  * This function returns register data
 265  */
 266 static u32 hw_read_intr_enable(struct ci13xxx *ci)
 267 {
 268         return hw_read(ci, OP_USBINTR, ~0);
 269 }
 270
 271 /**
 272  * hw_read_intr_status: returns interrupt status register
 273  *
 274  * This function returns register data
 275  */
 276 static u32 hw_read_intr_status(struct ci13xxx *ci)
 277 {
 278         return hw_read(ci, OP_USBSTS, ~0);
 279 }
 280
 281 /**
 282  * hw_test_and_clear_complete: test & clear complete status (execute without
 283  *                             interruption)
 284  * @n: endpoint number
 285  *
 286  * This function returns complete status
 287  */
 288 static int hw_test_and_clear_complete(struct ci13xxx *ci, int n)
 289 {
 290         n = ep_to_bit(ci, n);
 291         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 292 }
 293
 294 /**
 295  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 296  *                                without interruption)
 297  *
 298  * This function returns active interrutps
 299  */
 300 static u32 hw_test_and_clear_intr_active(struct ci13xxx *ci)
 301 {
 302         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 303
 304         hw_write(ci, OP_USBSTS, ~0, reg);
 305         return reg;
 306 }
 307
 308 /**
 309  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 310  *                                interruption)
 311  *
 312  * This function returns guard value
 313  */
 314 static int hw_test_and_clear_setup_guard(struct ci13xxx *ci)
 315 {
 316         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 317 }
 318
 319 /**
 320  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 321  *                              interruption)
 322  *
 323  * This function returns guard value
 324  */
 325 static int hw_test_and_set_setup_guard(struct ci13xxx *ci)
 326 {
 327         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 328 }
 329
 330 /**
 331  * hw_usb_set_address: configures USB address (execute without interruption)
 332  * @value: new USB address
 333  *
 334  * This function explicitly sets the address, without the "USBADRA" (advance)
 335  * feature, which is not supported by older versions of the controller.
 336  */
 337 static void hw_usb_set_address(struct ci13xxx *ci, u8 value)
 338 {
 339         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 340                  value << ffs_nr(DEVICEADDR_USBADR));
 341 }
 342
 343 /**
 344  * hw_usb_reset: restart device after a bus reset (execute without
 345  *               interruption)
 346  *
 347  * This function returns an error code
 348  */
 349 static int hw_usb_reset(struct ci13xxx *ci)
 350 {
 351         hw_usb_set_address(ci, 0);
 352
 353         /* ESS flushes only at end?!? */
 354         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 355
 356         /* clear setup token semaphores */
 357         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 358
 359         /* clear complete status */
 360         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 361
 362         /* wait until all bits cleared */
 363         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 364                 udelay(10);             /* not RTOS friendly */
 365
 366         /* reset all endpoints ? */
 367
 368         /* reset internal status and wait for further instructions
 369            no need to verify the port reset status (ESS does it) */
 370
 371         return 0;
 372 }
 373
 374 /******************************************************************************
 375  * UTIL block
 376  *****************************************************************************/
 377 /**
 378  * _usb_addr: calculates endpoint address from direction & number
 379  * @ep:  endpoint
 380  */
 381 static inline u8 _usb_addr(struct ci13xxx_ep *ep)
 382 {
 383         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 384 }
 385
 386 /**
 387  * _hardware_queue: configures a request at hardware level
 388  * @gadget: gadget
 389  * @mEp:    endpoint
 390  *
 391  * This function returns an error code
 392  */
 393 static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
 394 {
 395         struct ci13xxx *ci = mEp->ci;
 396         unsigned i;
 397         int ret = 0;
 398         unsigned length = mReq->req.length;
 399
 400         /* don't queue twice */
 401         if (mReq->req.status == -EALREADY)
 402                 return -EALREADY;
 403
 404         mReq->req.status = -EALREADY;
 405
 406         if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
 407                 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
 408                                            &mReq->zdma);
 409                 if (mReq->zptr == NULL)
 410                         return -ENOMEM;
 411
 412                 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
 413                 mReq->zptr->next    = TD_TERMINATE;
 414                 mReq->zptr->token   = TD_STATUS_ACTIVE;
 415                 if (!mReq->req.no_interrupt)
 416                         mReq->zptr->token   |= TD_IOC;
 417         }
 418         ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
 419         if (ret)
 420                 return ret;
 421
 422         /*
 423          * TD configuration
 424          * TODO - handle requests which spawns into several TDs
 425          */
 426         memset(mReq->ptr, 0, sizeof(*mReq->ptr));
 427         mReq->ptr->token    = length << ffs_nr(TD_TOTAL_BYTES);
 428         mReq->ptr->token   &= TD_TOTAL_BYTES;
 429         mReq->ptr->token   |= TD_STATUS_ACTIVE;
 430         if (mReq->zptr) {
 431                 mReq->ptr->next    = mReq->zdma;
 432         } else {
 433                 mReq->ptr->next    = TD_TERMINATE;
 434                 if (!mReq->req.no_interrupt)
 435                         mReq->ptr->token  |= TD_IOC;
 436         }
 437         mReq->ptr->page[0]  = mReq->req.dma;
 438         for (i = 1; i < 5; i++)
 439                 mReq->ptr->page[i] =
 440                         (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
 441
 442         if (!list_empty(&mEp->qh.queue)) {
 443                 struct ci13xxx_req *mReqPrev;
 444                 int n = hw_ep_bit(mEp->num, mEp->dir);
 445                 int tmp_stat;
 446
 447                 mReqPrev = list_entry(mEp->qh.queue.prev,
 448                                 struct ci13xxx_req, queue);
 449                 if (mReqPrev->zptr)
 450                         mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK;
 451                 else
 452                         mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK;
 453                 wmb();
 454                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 455                         goto done;
 456                 do {
 457                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 458                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 459                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 460                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 461                 if (tmp_stat)
 462                         goto done;
 463         }
 464
 465         /*  QH configuration */
 466         mEp->qh.ptr->td.next   = mReq->dma;    /* TERMINATE = 0 */
 467         mEp->qh.ptr->td.token &= ~TD_STATUS;   /* clear status */
 468         mEp->qh.ptr->cap |=  QH_ZLT;
 469
 470         wmb();   /* synchronize before ep prime */
 471
 472         ret = hw_ep_prime(ci, mEp->num, mEp->dir,
 473                            mEp->type == USB_ENDPOINT_XFER_CONTROL);
 474 done:
 475         return ret;
 476 }
 477
 478 /**
 479  * _hardware_dequeue: handles a request at hardware level
 480  * @gadget: gadget
 481  * @mEp:    endpoint
 482  *
 483  * This function returns an error code
 484  */
 485 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
 486 {
 487         if (mReq->req.status != -EALREADY)
 488                 return -EINVAL;
 489
 490         if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0)
 491                 return -EBUSY;
 492
 493         if (mReq->zptr) {
 494                 if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0)
 495                         return -EBUSY;
 496                 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
 497                 mReq->zptr = NULL;
 498         }
 499
 500         mReq->req.status = 0;
 501
 502         usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
 503
 504         mReq->req.status = mReq->ptr->token & TD_STATUS;
 505         if ((TD_STATUS_HALTED & mReq->req.status) != 0)
 506                 mReq->req.status = -1;
 507         else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
 508                 mReq->req.status = -1;
 509         else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
 510                 mReq->req.status = -1;
 511
 512         mReq->req.actual   = mReq->ptr->token & TD_TOTAL_BYTES;
 513         mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
 514         mReq->req.actual   = mReq->req.length - mReq->req.actual;
 515         mReq->req.actual   = mReq->req.status ? 0 : mReq->req.actual;
 516
 517         return mReq->req.actual;
 518 }
 519
 520 /**
 521  * _ep_nuke: dequeues all endpoint requests
 522  * @mEp: endpoint
 523  *
 524  * This function returns an error code
 525  * Caller must hold lock
 526  */
 527 static int _ep_nuke(struct ci13xxx_ep *mEp)
 528 __releases(mEp->lock)
 529 __acquires(mEp->lock)
 530 {
 531         if (mEp == NULL)
 532                 return -EINVAL;
 533
 534         hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
 535
 536         while (!list_empty(&mEp->qh.queue)) {
 537
 538                 /* pop oldest request */
 539                 struct ci13xxx_req *mReq = \
 540                         list_entry(mEp->qh.queue.next,
 541                                    struct ci13xxx_req, queue);
 542                 list_del_init(&mReq->queue);
 543                 mReq->req.status = -ESHUTDOWN;
 544
 545                 if (mReq->req.complete != NULL) {
 546                         spin_unlock(mEp->lock);
 547                         mReq->req.complete(&mEp->ep, &mReq->req);
 548                         spin_lock(mEp->lock);
 549                 }
 550         }
 551         return 0;
 552 }
 553
 554 /**
 555  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 556  * @gadget: gadget
 557  *
 558  * This function returns an error code
 559  */
 560 static int _gadget_stop_activity(struct usb_gadget *gadget)
 561 {
 562         struct usb_ep *ep;
 563         struct ci13xxx    *ci = container_of(gadget, struct ci13xxx, gadget);
 564         unsigned long flags;
 565
 566         spin_lock_irqsave(&ci->lock, flags);
 567         ci->gadget.speed = USB_SPEED_UNKNOWN;
 568         ci->remote_wakeup = 0;
 569         ci->suspended = 0;
 570         spin_unlock_irqrestore(&ci->lock, flags);
 571
 572         /* flush all endpoints */
 573         gadget_for_each_ep(ep, gadget) {
 574                 usb_ep_fifo_flush(ep);
 575         }
 576         usb_ep_fifo_flush(&ci->ep0out->ep);
 577         usb_ep_fifo_flush(&ci->ep0in->ep);
 578
 579         if (ci->driver)
 580                 ci->driver->disconnect(gadget);
 581
 582         /* make sure to disable all endpoints */
 583         gadget_for_each_ep(ep, gadget) {
 584                 usb_ep_disable(ep);
 585         }
 586
 587         if (ci->status != NULL) {
 588                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 589                 ci->status = NULL;
 590         }
 591
 592         return 0;
 593 }
 594
 595 /******************************************************************************
 596  * ISR block
 597  *****************************************************************************/
 598 /**
 599  * isr_reset_handler: USB reset interrupt handler
 600  * @ci: UDC device
 601  *
 602  * This function resets USB engine after a bus reset occurred
 603  */
 604 static void isr_reset_handler(struct ci13xxx *ci)
 605 __releases(ci->lock)
 606 __acquires(ci->lock)
 607 {
 608         int retval;
 609
 610         dbg_event(0xFF, "BUS RST", 0);
 611
 612         spin_unlock(&ci->lock);
 613         retval = _gadget_stop_activity(&ci->gadget);
 614         if (retval)
 615                 goto done;
 616
 617         retval = hw_usb_reset(ci);
 618         if (retval)
 619                 goto done;
 620
 621         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 622         if (ci->status == NULL)
 623                 retval = -ENOMEM;
 624
 625 done:
 626         spin_lock(&ci->lock);
 627
 628         if (retval)
 629                 dev_err(ci->dev, "error: %i\n", retval);
 630 }
 631
 632 /**
 633  * isr_get_status_complete: get_status request complete function
 634  * @ep:  endpoint
 635  * @req: request handled
 636  *
 637  * Caller must release lock
 638  */
 639 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 640 {
 641         if (ep == NULL || req == NULL)
 642                 return;
 643
 644         kfree(req->buf);
 645         usb_ep_free_request(ep, req);
 646 }
 647
 648 /**
 649  * isr_get_status_response: get_status request response
 650  * @ci: ci struct
 651  * @setup: setup request packet
 652  *
 653  * This function returns an error code
 654  */
 655 static int isr_get_status_response(struct ci13xxx *ci,
 656                                    struct usb_ctrlrequest *setup)
 657 __releases(mEp->lock)
 658 __acquires(mEp->lock)
 659 {
 660         struct ci13xxx_ep *mEp = ci->ep0in;
 661         struct usb_request *req = NULL;
 662         gfp_t gfp_flags = GFP_ATOMIC;
 663         int dir, num, retval;
 664
 665         if (mEp == NULL || setup == NULL)
 666                 return -EINVAL;
 667
 668         spin_unlock(mEp->lock);
 669         req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
 670         spin_lock(mEp->lock);
 671         if (req == NULL)
 672                 return -ENOMEM;
 673
 674         req->complete = isr_get_status_complete;
 675         req->length   = 2;
 676         req->buf      = kzalloc(req->length, gfp_flags);
 677         if (req->buf == NULL) {
 678                 retval = -ENOMEM;
 679                 goto err_free_req;
 680         }
 681
 682         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 683                 /* Assume that device is bus powered for now. */
 684                 *(u16 *)req->buf = ci->remote_wakeup << 1;
 685                 retval = 0;
 686         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 687                    == USB_RECIP_ENDPOINT) {
 688                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 689                         TX : RX;
 690                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 691                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 692         }
 693         /* else do nothing; reserved for future use */
 694
 695         spin_unlock(mEp->lock);
 696         retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
 697         spin_lock(mEp->lock);
 698         if (retval)
 699                 goto err_free_buf;
 700
 701         return 0;
 702
 703  err_free_buf:
 704         kfree(req->buf);
 705  err_free_req:
 706         spin_unlock(mEp->lock);
 707         usb_ep_free_request(&mEp->ep, req);
 708         spin_lock(mEp->lock);
 709         return retval;
 710 }
 711
 712 /**
 713  * isr_setup_status_complete: setup_status request complete function
 714  * @ep:  endpoint
 715  * @req: request handled
 716  *
 717  * Caller must release lock. Put the port in test mode if test mode
 718  * feature is selected.
 719  */
 720 static void
 721 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 722 {
 723         struct ci13xxx *ci = req->context;
 724         unsigned long flags;
 725
 726         if (ci->setaddr) {
 727                 hw_usb_set_address(ci, ci->address);
 728                 ci->setaddr = false;
 729         }
 730
 731         spin_lock_irqsave(&ci->lock, flags);
 732         if (ci->test_mode)
 733                 hw_port_test_set(ci, ci->test_mode);
 734         spin_unlock_irqrestore(&ci->lock, flags);
 735 }
 736
 737 /**
 738  * isr_setup_status_phase: queues the status phase of a setup transation
 739  * @ci: ci struct
 740  *
 741  * This function returns an error code
 742  */
 743 static int isr_setup_status_phase(struct ci13xxx *ci)
 744 __releases(mEp->lock)
 745 __acquires(mEp->lock)
 746 {
 747         int retval;
 748         struct ci13xxx_ep *mEp;
 749
 750         mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 751         ci->status->context = ci;
 752         ci->status->complete = isr_setup_status_complete;
 753
 754         spin_unlock(mEp->lock);
 755         retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
 756         spin_lock(mEp->lock);
 757
 758         return retval;
 759 }
 760
 761 /**
 762  * isr_tr_complete_low: transaction complete low level handler
 763  * @mEp: endpoint
 764  *
 765  * This function returns an error code
 766  * Caller must hold lock
 767  */
 768 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
 769 __releases(mEp->lock)
 770 __acquires(mEp->lock)
 771 {
 772         struct ci13xxx_req *mReq, *mReqTemp;
 773         struct ci13xxx_ep *mEpTemp = mEp;
 774         int retval = 0;
 775
 776         list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
 777                         queue) {
 778                 retval = _hardware_dequeue(mEp, mReq);
 779                 if (retval < 0)
 780                         break;
 781                 list_del_init(&mReq->queue);
 782                 dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
 783                 if (mReq->req.complete != NULL) {
 784                         spin_unlock(mEp->lock);
 785                         if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
 786                                         mReq->req.length)
 787                                 mEpTemp = mEp->ci->ep0in;
 788                         mReq->req.complete(&mEpTemp->ep, &mReq->req);
 789                         spin_lock(mEp->lock);
 790                 }
 791         }
 792
 793         if (retval == -EBUSY)
 794                 retval = 0;
 795         if (retval < 0)
 796                 dbg_event(_usb_addr(mEp), "DONE", retval);
 797
 798         return retval;
 799 }
 800
 801 /**
 802  * isr_tr_complete_handler: transaction complete interrupt handler
 803  * @ci: UDC descriptor
 804  *
 805  * This function handles traffic events
 806  */
 807 static void isr_tr_complete_handler(struct ci13xxx *ci)
 808 __releases(ci->lock)
 809 __acquires(ci->lock)
 810 {
 811         unsigned i;
 812         u8 tmode = 0;
 813
 814         for (i = 0; i < ci->hw_ep_max; i++) {
 815                 struct ci13xxx_ep *mEp  = &ci->ci13xxx_ep[i];
 816                 int type, num, dir, err = -EINVAL;
 817                 struct usb_ctrlrequest req;
 818
 819                 if (mEp->ep.desc == NULL)
 820                         continue;   /* not configured */
 821
 822                 if (hw_test_and_clear_complete(ci, i)) {
 823                         err = isr_tr_complete_low(mEp);
 824                         if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
 825                                 if (err > 0)   /* needs status phase */
 826                                         err = isr_setup_status_phase(ci);
 827                                 if (err < 0) {
 828                                         dbg_event(_usb_addr(mEp),
 829                                                   "ERROR", err);
 830                                         spin_unlock(&ci->lock);
 831                                         if (usb_ep_set_halt(&mEp->ep))
 832                                                 dev_err(ci->dev,
 833                                                         "error: ep_set_halt\n");
 834                                         spin_lock(&ci->lock);
 835                                 }
 836                         }
 837                 }
 838
 839                 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
 840                     !hw_test_and_clear_setup_status(ci, i))
 841                         continue;
 842
 843                 if (i != 0) {
 844                         dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
 845                         continue;
 846                 }
 847
 848                 /*
 849                  * Flush data and handshake transactions of previous
 850                  * setup packet.
 851                  */
 852                 _ep_nuke(ci->ep0out);
 853                 _ep_nuke(ci->ep0in);
 854
 855                 /* read_setup_packet */
 856                 do {
 857                         hw_test_and_set_setup_guard(ci);
 858                         memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
 859                 } while (!hw_test_and_clear_setup_guard(ci));
 860
 861                 type = req.bRequestType;
 862
 863                 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
 864
 865                 dbg_setup(_usb_addr(mEp), &req);
 866
 867                 switch (req.bRequest) {
 868                 case USB_REQ_CLEAR_FEATURE:
 869                         if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
 870                                         le16_to_cpu(req.wValue) ==
 871                                         USB_ENDPOINT_HALT) {
 872                                 if (req.wLength != 0)
 873                                         break;
 874                                 num  = le16_to_cpu(req.wIndex);
 875                                 dir = num & USB_ENDPOINT_DIR_MASK;
 876                                 num &= USB_ENDPOINT_NUMBER_MASK;
 877                                 if (dir) /* TX */
 878                                         num += ci->hw_ep_max/2;
 879                                 if (!ci->ci13xxx_ep[num].wedge) {
 880                                         spin_unlock(&ci->lock);
 881                                         err = usb_ep_clear_halt(
 882                                                 &ci->ci13xxx_ep[num].ep);
 883                                         spin_lock(&ci->lock);
 884                                         if (err)
 885                                                 break;
 886                                 }
 887                                 err = isr_setup_status_phase(ci);
 888                         } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
 889                                         le16_to_cpu(req.wValue) ==
 890                                         USB_DEVICE_REMOTE_WAKEUP) {
 891                                 if (req.wLength != 0)
 892                                         break;
 893                                 ci->remote_wakeup = 0;
 894                                 err = isr_setup_status_phase(ci);
 895                         } else {
 896                                 goto delegate;
 897                         }
 898                         break;
 899                 case USB_REQ_GET_STATUS:
 900                         if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
 901                             type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
 902                             type != (USB_DIR_IN|USB_RECIP_INTERFACE))
 903                                 goto delegate;
 904                         if (le16_to_cpu(req.wLength) != 2 ||
 905                             le16_to_cpu(req.wValue)  != 0)
 906                                 break;
 907                         err = isr_get_status_response(ci, &req);
 908                         break;
 909                 case USB_REQ_SET_ADDRESS:
 910                         if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
 911                                 goto delegate;
 912                         if (le16_to_cpu(req.wLength) != 0 ||
 913                             le16_to_cpu(req.wIndex)  != 0)
 914                                 break;
 915                         ci->address = (u8)le16_to_cpu(req.wValue);
 916                         ci->setaddr = true;
 917                         err = isr_setup_status_phase(ci);
 918                         break;
 919                 case USB_REQ_SET_FEATURE:
 920                         if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
 921                                         le16_to_cpu(req.wValue) ==
 922                                         USB_ENDPOINT_HALT) {
 923                                 if (req.wLength != 0)
 924                                         break;
 925                                 num  = le16_to_cpu(req.wIndex);
 926                                 dir = num & USB_ENDPOINT_DIR_MASK;
 927                                 num &= USB_ENDPOINT_NUMBER_MASK;
 928                                 if (dir) /* TX */
 929                                         num += ci->hw_ep_max/2;
 930
 931                                 spin_unlock(&ci->lock);
 932                                 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
 933                                 spin_lock(&ci->lock);
 934                                 if (!err)
 935                                         isr_setup_status_phase(ci);
 936                         } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
 937                                 if (req.wLength != 0)
 938                                         break;
 939                                 switch (le16_to_cpu(req.wValue)) {
 940                                 case USB_DEVICE_REMOTE_WAKEUP:
 941                                         ci->remote_wakeup = 1;
 942                                         err = isr_setup_status_phase(ci);
 943                                         break;
 944                                 case USB_DEVICE_TEST_MODE:
 945                                         tmode = le16_to_cpu(req.wIndex) >> 8;
 946                                         switch (tmode) {
 947                                         case TEST_J:
 948                                         case TEST_K:
 949                                         case TEST_SE0_NAK:
 950                                         case TEST_PACKET:
 951                                         case TEST_FORCE_EN:
 952                                                 ci->test_mode = tmode;
 953                                                 err = isr_setup_status_phase(
 954                                                                 ci);
 955                                                 break;
 956                                         default:
 957                                                 break;
 958                                         }
 959                                 default:
 960                                         goto delegate;
 961                                 }
 962                         } else {
 963                                 goto delegate;
 964                         }
 965                         break;
 966                 default:
 967 delegate:
 968                         if (req.wLength == 0)   /* no data phase */
 969                                 ci->ep0_dir = TX;
 970
 971                         spin_unlock(&ci->lock);
 972                         err = ci->driver->setup(&ci->gadget, &req);
 973                         spin_lock(&ci->lock);
 974                         break;
 975                 }
 976
 977                 if (err < 0) {
 978                         dbg_event(_usb_addr(mEp), "ERROR", err);
 979
 980                         spin_unlock(&ci->lock);
 981                         if (usb_ep_set_halt(&mEp->ep))
 982                                 dev_err(ci->dev, "error: ep_set_halt\n");
 983                         spin_lock(&ci->lock);
 984                 }
 985         }
 986 }
 987
 988 /******************************************************************************
 989  * ENDPT block
 990  *****************************************************************************/
 991 /**
 992  * ep_enable: configure endpoint, making it usable
 993  *
 994  * Check usb_ep_enable() at "usb_gadget.h" for details
 995  */
 996 static int ep_enable(struct usb_ep *ep,
 997                      const struct usb_endpoint_descriptor *desc)
 998 {
 999         struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1000         int retval = 0;
1001         unsigned long flags;
1002
1003         if (ep == NULL || desc == NULL)
1004                 return -EINVAL;
1005
1006         spin_lock_irqsave(mEp->lock, flags);
1007
1008         /* only internal SW should enable ctrl endpts */
1009
1010         mEp->ep.desc = desc;
1011
1012         if (!list_empty(&mEp->qh.queue))
1013                 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1014
1015         mEp->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1016         mEp->num  = usb_endpoint_num(desc);
1017         mEp->type = usb_endpoint_type(desc);
1018
1019         mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1020
1021         dbg_event(_usb_addr(mEp), "ENABLE", 0);
1022
1023         mEp->qh.ptr->cap = 0;
1024
1025         if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1026                 mEp->qh.ptr->cap |=  QH_IOS;
1027         else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
1028                 mEp->qh.ptr->cap &= ~QH_MULT;
1029         else
1030                 mEp->qh.ptr->cap &= ~QH_ZLT;
1031
1032         mEp->qh.ptr->cap |=
1033                 (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
1034         mEp->qh.ptr->td.next |= TD_TERMINATE;   /* needed? */
1035
1036         /*
1037          * Enable endpoints in the HW other than ep0 as ep0
1038          * is always enabled
1039          */
1040         if (mEp->num)
1041                 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1042
1043         spin_unlock_irqrestore(mEp->lock, flags);
1044         return retval;
1045 }
1046
1047 /**
1048  * ep_disable: endpoint is no longer usable
1049  *
1050  * Check usb_ep_disable() at "usb_gadget.h" for details
1051  */
1052 static int ep_disable(struct usb_ep *ep)
1053 {
1054         struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1055         int direction, retval = 0;
1056         unsigned long flags;
1057
1058         if (ep == NULL)
1059                 return -EINVAL;
1060         else if (mEp->ep.desc == NULL)
1061                 return -EBUSY;
1062
1063         spin_lock_irqsave(mEp->lock, flags);
1064
1065         /* only internal SW should disable ctrl endpts */
1066
1067         direction = mEp->dir;
1068         do {
1069                 dbg_event(_usb_addr(mEp), "DISABLE", 0);
1070
1071                 retval |= _ep_nuke(mEp);
1072                 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1073
1074                 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1075                         mEp->dir = (mEp->dir == TX) ? RX : TX;
1076
1077         } while (mEp->dir != direction);
1078
1079         mEp->ep.desc = NULL;
1080
1081         spin_unlock_irqrestore(mEp->lock, flags);
1082         return retval;
1083 }
1084
1085 /**
1086  * ep_alloc_request: allocate a request object to use with this endpoint
1087  *
1088  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1089  */
1090 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1091 {
1092         struct ci13xxx_ep  *mEp  = container_of(ep, struct ci13xxx_ep, ep);
1093         struct ci13xxx_req *mReq = NULL;
1094
1095         if (ep == NULL)
1096                 return NULL;
1097
1098         mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1099         if (mReq != NULL) {
1100                 INIT_LIST_HEAD(&mReq->queue);
1101
1102                 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1103                                            &mReq->dma);
1104                 if (mReq->ptr == NULL) {
1105                         kfree(mReq);
1106                         mReq = NULL;
1107                 }
1108         }
1109
1110         dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
1111
1112         return (mReq == NULL) ? NULL : &mReq->req;
1113 }
1114
1115 /**
1116  * ep_free_request: frees a request object
1117  *
1118  * Check usb_ep_free_request() at "usb_gadget.h" for details
1119  */
1120 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1121 {
1122         struct ci13xxx_ep  *mEp  = container_of(ep,  struct ci13xxx_ep, ep);
1123         struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1124         unsigned long flags;
1125
1126         if (ep == NULL || req == NULL) {
1127                 return;
1128         } else if (!list_empty(&mReq->queue)) {
1129                 dev_err(mEp->ci->dev, "freeing queued request\n");
1130                 return;
1131         }
1132
1133         spin_lock_irqsave(mEp->lock, flags);
1134
1135         if (mReq->ptr)
1136                 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1137         kfree(mReq);
1138
1139         dbg_event(_usb_addr(mEp), "FREE", 0);
1140
1141         spin_unlock_irqrestore(mEp->lock, flags);
1142 }
1143
1144 /**
1145  * ep_queue: queues (submits) an I/O request to an endpoint
1146  *
1147  * Check usb_ep_queue()* at usb_gadget.h" for details
1148  */
1149 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1150                     gfp_t __maybe_unused gfp_flags)
1151 {
1152         struct ci13xxx_ep  *mEp  = container_of(ep,  struct ci13xxx_ep, ep);
1153         struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1154         struct ci13xxx *ci = mEp->ci;
1155         int retval = 0;
1156         unsigned long flags;
1157
1158         if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1159                 return -EINVAL;
1160
1161         spin_lock_irqsave(mEp->lock, flags);
1162
1163         if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1164                 if (req->length)
1165                         mEp = (ci->ep0_dir == RX) ?
1166                                ci->ep0out : ci->ep0in;
1167                 if (!list_empty(&mEp->qh.queue)) {
1168                         _ep_nuke(mEp);
1169                         retval = -EOVERFLOW;
1170                         dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
1171                                  _usb_addr(mEp));
1172                 }
1173         }
1174
1175         /* first nuke then test link, e.g. previous status has not sent */
1176         if (!list_empty(&mReq->queue)) {
1177                 retval = -EBUSY;
1178                 dev_err(mEp->ci->dev, "request already in queue\n");
1179                 goto done;
1180         }
1181
1182         if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1183                 req->length = 4 * CI13XXX_PAGE_SIZE;
1184                 retval = -EMSGSIZE;
1185                 dev_warn(mEp->ci->dev, "request length truncated\n");
1186         }
1187
1188         dbg_queue(_usb_addr(mEp), req, retval);
1189
1190         /* push request */
1191         mReq->req.status = -EINPROGRESS;
1192         mReq->req.actual = 0;
1193
1194         retval = _hardware_enqueue(mEp, mReq);
1195
1196         if (retval == -EALREADY) {
1197                 dbg_event(_usb_addr(mEp), "QUEUE", retval);
1198                 retval = 0;
1199         }
1200         if (!retval)
1201                 list_add_tail(&mReq->queue, &mEp->qh.queue);
1202
1203  done:
1204         spin_unlock_irqrestore(mEp->lock, flags);
1205         return retval;
1206 }
1207
1208 /**
1209  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1210  *
1211  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1212  */
1213 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1214 {
1215         struct ci13xxx_ep  *mEp  = container_of(ep,  struct ci13xxx_ep, ep);
1216         struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1217         unsigned long flags;
1218
1219         if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1220                 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1221                 list_empty(&mEp->qh.queue))
1222                 return -EINVAL;
1223
1224         spin_lock_irqsave(mEp->lock, flags);
1225
1226         dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
1227
1228         hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1229
1230         /* pop request */
1231         list_del_init(&mReq->queue);
1232
1233         usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1234
1235         req->status = -ECONNRESET;
1236
1237         if (mReq->req.complete != NULL) {
1238                 spin_unlock(mEp->lock);
1239                 mReq->req.complete(&mEp->ep, &mReq->req);
1240                 spin_lock(mEp->lock);
1241         }
1242
1243         spin_unlock_irqrestore(mEp->lock, flags);
1244         return 0;
1245 }
1246
1247 /**
1248  * ep_set_halt: sets the endpoint halt feature
1249  *
1250  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1251  */
1252 static int ep_set_halt(struct usb_ep *ep, int value)
1253 {
1254         struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1255         int direction, retval = 0;
1256         unsigned long flags;
1257
1258         if (ep == NULL || mEp->ep.desc == NULL)
1259                 return -EINVAL;
1260
1261         spin_lock_irqsave(mEp->lock, flags);
1262
1263 #ifndef STALL_IN
1264         /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1265         if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1266             !list_empty(&mEp->qh.queue)) {
1267                 spin_unlock_irqrestore(mEp->lock, flags);
1268                 return -EAGAIN;
1269         }
1270 #endif
1271
1272         direction = mEp->dir;
1273         do {
1274                 dbg_event(_usb_addr(mEp), "HALT", value);
1275                 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1276
1277                 if (!value)
1278                         mEp->wedge = 0;
1279
1280                 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1281                         mEp->dir = (mEp->dir == TX) ? RX : TX;
1282
1283         } while (mEp->dir != direction);
1284
1285         spin_unlock_irqrestore(mEp->lock, flags);
1286         return retval;
1287 }
1288
1289 /**
1290  * ep_set_wedge: sets the halt feature and ignores clear requests
1291  *
1292  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1293  */
1294 static int ep_set_wedge(struct usb_ep *ep)
1295 {
1296         struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1297         unsigned long flags;
1298
1299         if (ep == NULL || mEp->ep.desc == NULL)
1300                 return -EINVAL;
1301
1302         spin_lock_irqsave(mEp->lock, flags);
1303
1304         dbg_event(_usb_addr(mEp), "WEDGE", 0);
1305         mEp->wedge = 1;
1306
1307         spin_unlock_irqrestore(mEp->lock, flags);
1308
1309         return usb_ep_set_halt(ep);
1310 }
1311
1312 /**
1313  * ep_fifo_flush: flushes contents of a fifo
1314  *
1315  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1316  */
1317 static void ep_fifo_flush(struct usb_ep *ep)
1318 {
1319         struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1320         unsigned long flags;
1321
1322         if (ep == NULL) {
1323                 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1324                 return;
1325         }
1326
1327         spin_lock_irqsave(mEp->lock, flags);
1328
1329         dbg_event(_usb_addr(mEp), "FFLUSH", 0);
1330         hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1331
1332         spin_unlock_irqrestore(mEp->lock, flags);
1333 }
1334
1335 /**
1336  * Endpoint-specific part of the API to the USB controller hardware
1337  * Check "usb_gadget.h" for details
1338  */
1339 static const struct usb_ep_ops usb_ep_ops = {
1340         .enable        = ep_enable,
1341         .disable       = ep_disable,
1342         .alloc_request = ep_alloc_request,
1343         .free_request  = ep_free_request,
1344         .queue         = ep_queue,
1345         .dequeue       = ep_dequeue,
1346         .set_halt      = ep_set_halt,
1347         .set_wedge     = ep_set_wedge,
1348         .fifo_flush    = ep_fifo_flush,
1349 };
1350
1351 /******************************************************************************
1352  * GADGET block
1353  *****************************************************************************/
1354 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1355 {
1356         struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1357         unsigned long flags;
1358         int gadget_ready = 0;
1359
1360         if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1361                 return -EOPNOTSUPP;
1362
1363         spin_lock_irqsave(&ci->lock, flags);
1364         ci->vbus_active = is_active;
1365         if (ci->driver)
1366                 gadget_ready = 1;
1367         spin_unlock_irqrestore(&ci->lock, flags);
1368
1369         if (gadget_ready) {
1370                 if (is_active) {
1371                         pm_runtime_get_sync(&_gadget->dev);
1372                         hw_device_reset(ci, USBMODE_CM_DC);
1373                         hw_device_state(ci, ci->ep0out->qh.dma);
1374                 } else {
1375                         hw_device_state(ci, 0);
1376                         if (ci->platdata->notify_event)
1377                                 ci->platdata->notify_event(ci,
1378                                 CI13XXX_CONTROLLER_STOPPED_EVENT);
1379                         _gadget_stop_activity(&ci->gadget);
1380                         pm_runtime_put_sync(&_gadget->dev);
1381                 }
1382         }
1383
1384         return 0;
1385 }
1386
1387 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1388 {
1389         struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1390         unsigned long flags;
1391         int ret = 0;
1392
1393         spin_lock_irqsave(&ci->lock, flags);
1394         if (!ci->remote_wakeup) {
1395                 ret = -EOPNOTSUPP;
1396                 goto out;
1397         }
1398         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1399                 ret = -EINVAL;
1400                 goto out;
1401         }
1402         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1403 out:
1404         spin_unlock_irqrestore(&ci->lock, flags);
1405         return ret;
1406 }
1407
1408 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1409 {
1410         struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1411
1412         if (ci->transceiver)
1413                 return usb_phy_set_power(ci->transceiver, mA);
1414         return -ENOTSUPP;
1415 }
1416
1417 /* Change Data+ pullup status
1418  * this func is used by usb_gadget_connect/disconnet
1419  */
1420 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1421 {
1422         struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1423
1424         if (is_on)
1425                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1426         else
1427                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1428
1429         return 0;
1430 }
1431
1432 static int ci13xxx_start(struct usb_gadget *gadget,
1433                          struct usb_gadget_driver *driver);
1434 static int ci13xxx_stop(struct usb_gadget *gadget,
1435                         struct usb_gadget_driver *driver);
1436 /**
1437  * Device operations part of the API to the USB controller hardware,
1438  * which don't involve endpoints (or i/o)
1439  * Check  "usb_gadget.h" for details
1440  */
1441 static const struct usb_gadget_ops usb_gadget_ops = {
1442         .vbus_session   = ci13xxx_vbus_session,
1443         .wakeup         = ci13xxx_wakeup,
1444         .pullup         = ci13xxx_pullup,
1445         .vbus_draw      = ci13xxx_vbus_draw,
1446         .udc_start      = ci13xxx_start,
1447         .udc_stop       = ci13xxx_stop,
1448 };
1449
1450 static int init_eps(struct ci13xxx *ci)
1451 {
1452         int retval = 0, i, j;
1453
1454         for (i = 0; i < ci->hw_ep_max/2; i++)
1455                 for (j = RX; j <= TX; j++) {
1456                         int k = i + j * ci->hw_ep_max/2;
1457                         struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1458
1459                         scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1460                                         (j == TX)  ? "in" : "out");
1461
1462                         mEp->ci          = ci;
1463                         mEp->lock         = &ci->lock;
1464                         mEp->td_pool      = ci->td_pool;
1465
1466                         mEp->ep.name      = mEp->name;
1467                         mEp->ep.ops       = &usb_ep_ops;
1468                         /*
1469                          * for ep0: maxP defined in desc, for other
1470                          * eps, maxP is set by epautoconfig() called
1471                          * by gadget layer
1472                          */
1473                         mEp->ep.maxpacket = (unsigned short)~0;
1474
1475                         INIT_LIST_HEAD(&mEp->qh.queue);
1476                         mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1477                                                      &mEp->qh.dma);
1478                         if (mEp->qh.ptr == NULL)
1479                                 retval = -ENOMEM;
1480                         else
1481                                 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1482
1483                         /*
1484                          * set up shorthands for ep0 out and in endpoints,
1485                          * don't add to gadget's ep_list
1486                          */
1487                         if (i == 0) {
1488                                 if (j == RX)
1489                                         ci->ep0out = mEp;
1490                                 else
1491                                         ci->ep0in = mEp;
1492
1493                                 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1494                                 continue;
1495                         }
1496
1497                         list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1498                 }
1499
1500         return retval;
1501 }
1502
1503 static void destroy_eps(struct ci13xxx *ci)
1504 {
1505         int i;
1506
1507         for (i = 0; i < ci->hw_ep_max; i++) {
1508                 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1509
1510                 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1511         }
1512 }
1513
1514 /**
1515  * ci13xxx_start: register a gadget driver
1516  * @gadget: our gadget
1517  * @driver: the driver being registered
1518  *
1519  * Interrupts are enabled here.
1520  */
1521 static int ci13xxx_start(struct usb_gadget *gadget,
1522                          struct usb_gadget_driver *driver)
1523 {
1524         struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1525         unsigned long flags;
1526         int retval = -ENOMEM;
1527
1528         if (driver->disconnect == NULL)
1529                 return -EINVAL;
1530
1531
1532         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1533         retval = usb_ep_enable(&ci->ep0out->ep);
1534         if (retval)
1535                 return retval;
1536
1537         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1538         retval = usb_ep_enable(&ci->ep0in->ep);
1539         if (retval)
1540                 return retval;
1541         spin_lock_irqsave(&ci->lock, flags);
1542
1543         ci->driver = driver;
1544         pm_runtime_get_sync(&ci->gadget.dev);
1545         if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1546                 if (ci->vbus_active) {
1547                         if (ci->platdata->flags & CI13XXX_REGS_SHARED)
1548                                 hw_device_reset(ci, USBMODE_CM_DC);
1549                 } else {
1550                         pm_runtime_put_sync(&ci->gadget.dev);
1551                         goto done;
1552                 }
1553         }
1554
1555         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1556         if (retval)
1557                 pm_runtime_put_sync(&ci->gadget.dev);
1558
1559  done:
1560         spin_unlock_irqrestore(&ci->lock, flags);
1561         return retval;
1562 }
1563
1564 /**
1565  * ci13xxx_stop: unregister a gadget driver
1566  */
1567 static int ci13xxx_stop(struct usb_gadget *gadget,
1568                         struct usb_gadget_driver *driver)
1569 {
1570         struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1571         unsigned long flags;
1572
1573         spin_lock_irqsave(&ci->lock, flags);
1574
1575         if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1576                         ci->vbus_active) {
1577                 hw_device_state(ci, 0);
1578                 if (ci->platdata->notify_event)
1579                         ci->platdata->notify_event(ci,
1580                         CI13XXX_CONTROLLER_STOPPED_EVENT);
1581                 ci->driver = NULL;
1582                 spin_unlock_irqrestore(&ci->lock, flags);
1583                 _gadget_stop_activity(&ci->gadget);
1584                 spin_lock_irqsave(&ci->lock, flags);
1585                 pm_runtime_put(&ci->gadget.dev);
1586         }
1587
1588         spin_unlock_irqrestore(&ci->lock, flags);
1589
1590         return 0;
1591 }
1592
1593 /******************************************************************************
1594  * BUS block
1595  *****************************************************************************/
1596 /**
1597  * udc_irq: ci interrupt handler
1598  *
1599  * This function returns IRQ_HANDLED if the IRQ has been handled
1600  * It locks access to registers
1601  */
1602 static irqreturn_t udc_irq(struct ci13xxx *ci)
1603 {
1604         irqreturn_t retval;
1605         u32 intr;
1606
1607         if (ci == NULL)
1608                 return IRQ_HANDLED;
1609
1610         spin_lock(&ci->lock);
1611
1612         if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1613                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1614                                 USBMODE_CM_DC) {
1615                         spin_unlock(&ci->lock);
1616                         return IRQ_NONE;
1617                 }
1618         }
1619         intr = hw_test_and_clear_intr_active(ci);
1620         dbg_interrupt(intr);
1621
1622         if (intr) {
1623                 /* order defines priority - do NOT change it */
1624                 if (USBi_URI & intr)
1625                         isr_reset_handler(ci);
1626
1627                 if (USBi_PCI & intr) {
1628                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1629                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1630                         if (ci->suspended && ci->driver->resume) {
1631                                 spin_unlock(&ci->lock);
1632                                 ci->driver->resume(&ci->gadget);
1633                                 spin_lock(&ci->lock);
1634                                 ci->suspended = 0;
1635                         }
1636                 }
1637
1638                 if (USBi_UI  & intr)
1639                         isr_tr_complete_handler(ci);
1640
1641                 if (USBi_SLI & intr) {
1642                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1643                             ci->driver->suspend) {
1644                                 ci->suspended = 1;
1645                                 spin_unlock(&ci->lock);
1646                                 ci->driver->suspend(&ci->gadget);
1647                                 spin_lock(&ci->lock);
1648                         }
1649                 }
1650                 retval = IRQ_HANDLED;
1651         } else {
1652                 retval = IRQ_NONE;
1653         }
1654         spin_unlock(&ci->lock);
1655
1656         return retval;
1657 }
1658
1659 /**
1660  * udc_release: driver release function
1661  * @dev: device
1662  *
1663  * Currently does nothing
1664  */
1665 static void udc_release(struct device *dev)
1666 {
1667 }
1668
1669 /**
1670  * udc_start: initialize gadget role
1671  * @ci: chipidea controller
1672  */
1673 static int udc_start(struct ci13xxx *ci)
1674 {
1675         struct device *dev = ci->dev;
1676         int retval = 0;
1677
1678         spin_lock_init(&ci->lock);
1679
1680         ci->gadget.ops          = &usb_gadget_ops;
1681         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1682         ci->gadget.max_speed    = USB_SPEED_HIGH;
1683         ci->gadget.is_otg       = 0;
1684         ci->gadget.name         = ci->platdata->name;
1685
1686         INIT_LIST_HEAD(&ci->gadget.ep_list);
1687
1688         dev_set_name(&ci->gadget.dev, "gadget");
1689         ci->gadget.dev.dma_mask = dev->dma_mask;
1690         ci->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1691         ci->gadget.dev.parent   = dev;
1692         ci->gadget.dev.release  = udc_release;
1693
1694         /* alloc resources */
1695         ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1696                                        sizeof(struct ci13xxx_qh),
1697                                        64, CI13XXX_PAGE_SIZE);
1698         if (ci->qh_pool == NULL)
1699                 return -ENOMEM;
1700
1701         ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1702                                        sizeof(struct ci13xxx_td),
1703                                        64, CI13XXX_PAGE_SIZE);
1704         if (ci->td_pool == NULL) {
1705                 retval = -ENOMEM;
1706                 goto free_qh_pool;
1707         }
1708
1709         retval = init_eps(ci);
1710         if (retval)
1711                 goto free_pools;
1712
1713         ci->gadget.ep0 = &ci->ep0in->ep;
1714
1715         if (ci->global_phy)
1716                 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1717
1718         if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1719                 if (ci->transceiver == NULL) {
1720                         retval = -ENODEV;
1721                         goto destroy_eps;
1722                 }
1723         }
1724
1725         if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1726                 retval = hw_device_reset(ci, USBMODE_CM_DC);
1727                 if (retval)
1728                         goto put_transceiver;
1729         }
1730
1731         retval = device_register(&ci->gadget.dev);
1732         if (retval) {
1733                 put_device(&ci->gadget.dev);
1734                 goto put_transceiver;
1735         }
1736
1737         retval = dbg_create_files(&ci->gadget.dev);
1738         if (retval)
1739                 goto unreg_device;
1740
1741         if (!IS_ERR_OR_NULL(ci->transceiver)) {
1742                 retval = otg_set_peripheral(ci->transceiver->otg,
1743                                                 &ci->gadget);
1744                 if (retval)
1745                         goto remove_dbg;
1746         }
1747
1748         retval = usb_add_gadget_udc(dev, &ci->gadget);
1749         if (retval)
1750                 goto remove_trans;
1751
1752         pm_runtime_no_callbacks(&ci->gadget.dev);
1753         pm_runtime_enable(&ci->gadget.dev);
1754
1755         return retval;
1756
1757 remove_trans:
1758         if (!IS_ERR_OR_NULL(ci->transceiver)) {
1759                 otg_set_peripheral(ci->transceiver->otg, NULL);
1760                 if (ci->global_phy)
1761                         usb_put_phy(ci->transceiver);
1762         }
1763
1764         dev_err(dev, "error = %i\n", retval);
1765 remove_dbg:
1766         dbg_remove_files(&ci->gadget.dev);
1767 unreg_device:
1768         device_unregister(&ci->gadget.dev);
1769 put_transceiver:
1770         if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1771                 usb_put_phy(ci->transceiver);
1772 destroy_eps:
1773         destroy_eps(ci);
1774 free_pools:
1775         dma_pool_destroy(ci->td_pool);
1776 free_qh_pool:
1777         dma_pool_destroy(ci->qh_pool);
1778         return retval;
1779 }
1780
1781 /**
1782  * udc_remove: parent remove must call this to remove UDC
1783  *
1784  * No interrupts active, the IRQ has been released
1785  */
1786 static void udc_stop(struct ci13xxx *ci)
1787 {
1788         if (ci == NULL)
1789                 return;
1790
1791         usb_del_gadget_udc(&ci->gadget);
1792
1793         destroy_eps(ci);
1794
1795         dma_pool_destroy(ci->td_pool);
1796         dma_pool_destroy(ci->qh_pool);
1797
1798         if (!IS_ERR_OR_NULL(ci->transceiver)) {
1799                 otg_set_peripheral(ci->transceiver->otg, NULL);
1800                 if (ci->global_phy)
1801                         usb_put_phy(ci->transceiver);
1802         }
1803         dbg_remove_files(&ci->gadget.dev);
1804         device_unregister(&ci->gadget.dev);
1805         /* my kobject is dynamic, I swear! */
1806         memset(&ci->gadget, 0, sizeof(ci->gadget));
1807 }
1808
1809 /**
1810  * ci_hdrc_gadget_init - initialize device related bits
1811  * ci: the controller
1812  *
1813  * This function enables the gadget role, if the device is "device capable".
1814  */
1815 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1816 {
1817         struct ci_role_driver *rdrv;
1818
1819         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1820                 return -ENXIO;
1821
1822         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1823         if (!rdrv)
1824                 return -ENOMEM;
1825
1826         rdrv->start     = udc_start;
1827         rdrv->stop      = udc_stop;
1828         rdrv->irq       = udc_irq;
1829         rdrv->name      = "gadget";
1830         ci->roles[CI_ROLE_GADGET] = rdrv;
1831
1832         return 0;
1833 }