drivers/usb/cdns3/ep0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS DRD Driver - gadget side.
   4  *
   5  * Copyright (C) 2018 Cadence Design Systems.
   6  * Copyright (C) 2017-2018 NXP
   7  *
   8  * Authors: Pawel Jez <pjez@cadence.com>,
   9  *          Pawel Laszczak <pawell@cadence.com>
  10  *          Peter Chen <peter.chen@nxp.com>
  11  */
  12
  13 #include <linux/usb/composite.h>
  14 #include <linux/iopoll.h>
  15
  16 #include "gadget.h"
  17 #include "trace.h"
  18
  19 static struct usb_endpoint_descriptor cdns3_gadget_ep0_desc = {
  20         .bLength = USB_DT_ENDPOINT_SIZE,
  21         .bDescriptorType = USB_DT_ENDPOINT,
  22         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  23 };
  24
  25 /**
  26  * cdns3_ep0_run_transfer - Do transfer on default endpoint hardware
  27  * @priv_dev: extended gadget object
  28  * @dma_addr: physical address where data is/will be stored
  29  * @length: data length
  30  * @erdy: set it to 1 when ERDY packet should be sent -
  31  *        exit from flow control state
  32  */
  33 static void cdns3_ep0_run_transfer(struct cdns3_device *priv_dev,
  34                                    dma_addr_t dma_addr,
  35                                    unsigned int length, int erdy, int zlp)
  36 {
  37         struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
  38         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
  39
  40         priv_ep->trb_pool[0].buffer = TRB_BUFFER(dma_addr);
  41         priv_ep->trb_pool[0].length = TRB_LEN(length);
  42
  43         if (zlp) {
  44                 priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_TYPE(TRB_NORMAL);
  45                 priv_ep->trb_pool[1].buffer = TRB_BUFFER(dma_addr);
  46                 priv_ep->trb_pool[1].length = TRB_LEN(0);
  47                 priv_ep->trb_pool[1].control = TRB_CYCLE | TRB_IOC |
  48                     TRB_TYPE(TRB_NORMAL);
  49         } else {
  50                 priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_IOC |
  51                     TRB_TYPE(TRB_NORMAL);
  52                 priv_ep->trb_pool[1].control = 0;
  53         }
  54
  55         trace_cdns3_prepare_trb(priv_ep, priv_ep->trb_pool);
  56
  57         cdns3_select_ep(priv_dev, priv_dev->ep0_data_dir);
  58
  59         writel(EP_STS_TRBERR, &regs->ep_sts);
  60         writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), &regs->ep_traddr);
  61         trace_cdns3_doorbell_ep0(priv_dev->ep0_data_dir ? "ep0in" : "ep0out",
  62                                  readl(&regs->ep_traddr));
  63
  64         /* TRB should be prepared before starting transfer. */
  65         writel(EP_CMD_DRDY, &regs->ep_cmd);
  66
  67         /* Resume controller before arming transfer. */
  68         __cdns3_gadget_wakeup(priv_dev);
  69
  70         if (erdy)
  71                 writel(EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
  72 }
  73
  74 /**
  75  * cdns3_ep0_delegate_req - Returns status of handling setup packet
  76  * Setup is handled by gadget driver
  77  * @priv_dev: extended gadget object
  78  * @ctrl_req: pointer to received setup packet
  79  *
  80  * Returns zero on success or negative value on failure
  81  */
  82 static int cdns3_ep0_delegate_req(struct cdns3_device *priv_dev,
  83                                   struct usb_ctrlrequest *ctrl_req)
  84 {
  85         int ret;
  86
  87         spin_unlock(&priv_dev->lock);
  88         priv_dev->setup_pending = 1;
  89         ret = priv_dev->gadget_driver->setup(&priv_dev->gadget, ctrl_req);
  90         priv_dev->setup_pending = 0;
  91         spin_lock(&priv_dev->lock);
  92         return ret;
  93 }
  94
  95 static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
  96 {
  97         priv_dev->ep0_data_dir = 0;
  98         priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
  99         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
 100                                sizeof(struct usb_ctrlrequest), 0, 0);
 101 }
 102
 103 static void cdns3_ep0_complete_setup(struct cdns3_device *priv_dev,
 104                                      u8 send_stall, u8 send_erdy)
 105 {
 106         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 107         struct usb_request *request;
 108
 109         request = cdns3_next_request(&priv_ep->pending_req_list);
 110         if (request)
 111                 list_del_init(&request->list);
 112
 113         if (send_stall) {
 114                 trace_cdns3_halt(priv_ep, send_stall, 0);
 115                 /* set_stall on ep0 */
 116                 cdns3_select_ep(priv_dev, 0x00);
 117                 writel(EP_CMD_SSTALL, &priv_dev->regs->ep_cmd);
 118         } else {
 119                 cdns3_prepare_setup_packet(priv_dev);
 120         }
 121
 122         priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
 123         writel((send_erdy ? EP_CMD_ERDY : 0) | EP_CMD_REQ_CMPL,
 124                &priv_dev->regs->ep_cmd);
 125
 126         cdns3_allow_enable_l1(priv_dev, 1);
 127 }
 128
 129 /**
 130  * cdns3_req_ep0_set_configuration - Handling of SET_CONFIG standard USB request
 131  * @priv_dev: extended gadget object
 132  * @ctrl_req: pointer to received setup packet
 133  *
 134  * Returns 0 if success, USB_GADGET_DELAYED_STATUS on deferred status stage,
 135  * error code on error
 136  */
 137 static int cdns3_req_ep0_set_configuration(struct cdns3_device *priv_dev,
 138                                            struct usb_ctrlrequest *ctrl_req)
 139 {
 140         enum usb_device_state device_state = priv_dev->gadget.state;
 141         struct cdns3_endpoint *priv_ep;
 142         u32 config = le16_to_cpu(ctrl_req->wValue);
 143         int result = 0;
 144         int i;
 145
 146         switch (device_state) {
 147         case USB_STATE_ADDRESS:
 148                 /* Configure non-control EPs */
 149                 for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
 150                         priv_ep = priv_dev->eps[i];
 151                         if (!priv_ep)
 152                                 continue;
 153
 154                         if (priv_ep->flags & EP_CLAIMED)
 155                                 cdns3_ep_config(priv_ep);
 156                 }
 157
 158                 result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 159
 160                 if (result)
 161                         return result;
 162
 163                 if (config) {
 164                         cdns3_set_hw_configuration(priv_dev);
 165                 } else {
 166                         cdns3_hw_reset_eps_config(priv_dev);
 167                         usb_gadget_set_state(&priv_dev->gadget,
 168                                              USB_STATE_ADDRESS);
 169                 }
 170                 break;
 171         case USB_STATE_CONFIGURED:
 172                 result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 173
 174                 if (!config && !result) {
 175                         cdns3_hw_reset_eps_config(priv_dev);
 176                         usb_gadget_set_state(&priv_dev->gadget,
 177                                              USB_STATE_ADDRESS);
 178                 }
 179                 break;
 180         default:
 181                 result = -EINVAL;
 182         }
 183
 184         return result;
 185 }
 186
 187 /**
 188  * cdns3_req_ep0_set_address - Handling of SET_ADDRESS standard USB request
 189  * @priv_dev: extended gadget object
 190  * @ctrl_req: pointer to received setup packet
 191  *
 192  * Returns 0 if success, error code on error
 193  */
 194 static int cdns3_req_ep0_set_address(struct cdns3_device *priv_dev,
 195                                      struct usb_ctrlrequest *ctrl_req)
 196 {
 197         enum usb_device_state device_state = priv_dev->gadget.state;
 198         u32 reg;
 199         u32 addr;
 200
 201         addr = le16_to_cpu(ctrl_req->wValue);
 202
 203         if (addr > USB_DEVICE_MAX_ADDRESS) {
 204                 dev_err(priv_dev->dev,
 205                         "Device address (%d) cannot be greater than %d\n",
 206                         addr, USB_DEVICE_MAX_ADDRESS);
 207                 return -EINVAL;
 208         }
 209
 210         if (device_state == USB_STATE_CONFIGURED) {
 211                 dev_err(priv_dev->dev,
 212                         "can't set_address from configured state\n");
 213                 return -EINVAL;
 214         }
 215
 216         reg = readl(&priv_dev->regs->usb_cmd);
 217
 218         writel(reg | USB_CMD_FADDR(addr) | USB_CMD_SET_ADDR,
 219                &priv_dev->regs->usb_cmd);
 220
 221         usb_gadget_set_state(&priv_dev->gadget,
 222                              (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));
 223
 224         return 0;
 225 }
 226
 227 /**
 228  * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
 229  * @priv_dev: extended gadget object
 230  * @ctrl_req: pointer to received setup packet
 231  *
 232  * Returns 0 if success, error code on error
 233  */
 234 static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
 235                                     struct usb_ctrlrequest *ctrl)
 236 {
 237         struct cdns3_endpoint *priv_ep;
 238         __le16 *response_pkt;
 239         u16 usb_status = 0;
 240         u32 recip;
 241         u8 index;
 242
 243         recip = ctrl->bRequestType & USB_RECIP_MASK;
 244
 245         switch (recip) {
 246         case USB_RECIP_DEVICE:
 247                 /* self powered */
 248                 if (priv_dev->is_selfpowered)
 249                         usb_status = BIT(USB_DEVICE_SELF_POWERED);
 250
 251                 if (priv_dev->wake_up_flag)
 252                         usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
 253
 254                 if (priv_dev->gadget.speed != USB_SPEED_SUPER)
 255                         break;
 256
 257                 if (priv_dev->u1_allowed)
 258                         usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);
 259
 260                 if (priv_dev->u2_allowed)
 261                         usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);
 262
 263                 break;
 264         case USB_RECIP_INTERFACE:
 265                 return cdns3_ep0_delegate_req(priv_dev, ctrl);
 266         case USB_RECIP_ENDPOINT:
 267                 index = cdns3_ep_addr_to_index(ctrl->wIndex);
 268                 priv_ep = priv_dev->eps[index];
 269
 270                 /* check if endpoint is stalled or stall is pending */
 271                 cdns3_select_ep(priv_dev, ctrl->wIndex);
 272                 if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)) ||
 273                     (priv_ep->flags & EP_STALL_PENDING))
 274                         usb_status =  BIT(USB_ENDPOINT_HALT);
 275                 break;
 276         default:
 277                 return -EINVAL;
 278         }
 279
 280         response_pkt = (__le16 *)priv_dev->setup_buf;
 281         *response_pkt = cpu_to_le16(usb_status);
 282
 283         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
 284                                sizeof(*response_pkt), 1, 0);
 285         return 0;
 286 }
 287
 288 static int cdns3_ep0_feature_handle_device(struct cdns3_device *priv_dev,
 289                                            struct usb_ctrlrequest *ctrl,
 290                                            int set)
 291 {
 292         enum usb_device_state state;
 293         enum usb_device_speed speed;
 294         int ret = 0;
 295         u32 wValue;
 296         u16 tmode;
 297
 298         wValue = le16_to_cpu(ctrl->wValue);
 299         state = priv_dev->gadget.state;
 300         speed = priv_dev->gadget.speed;
 301
 302         switch (wValue) {
 303         case USB_DEVICE_REMOTE_WAKEUP:
 304                 priv_dev->wake_up_flag = !!set;
 305                 break;
 306         case USB_DEVICE_U1_ENABLE:
 307                 if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
 308                         return -EINVAL;
 309
 310                 priv_dev->u1_allowed = !!set;
 311                 break;
 312         case USB_DEVICE_U2_ENABLE:
 313                 if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
 314                         return -EINVAL;
 315
 316                 priv_dev->u2_allowed = !!set;
 317                 break;
 318         case USB_DEVICE_LTM_ENABLE:
 319                 ret = -EINVAL;
 320                 break;
 321         case USB_DEVICE_TEST_MODE:
 322                 if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
 323                         return -EINVAL;
 324
 325                 tmode = le16_to_cpu(ctrl->wIndex);
 326
 327                 if (!set || (tmode & 0xff) != 0)
 328                         return -EINVAL;
 329
 330                 switch (tmode >> 8) {
 331                 case TEST_J:
 332                 case TEST_K:
 333                 case TEST_SE0_NAK:
 334                 case TEST_PACKET:
 335                         cdns3_ep0_complete_setup(priv_dev, 0, 1);
 336                         /**
 337                          *  Little delay to give the controller some time
 338                          * for sending status stage.
 339                          * This time should be less then 3ms.
 340                          */
 341                         mdelay(1);
 342                         cdns3_set_register_bit(&priv_dev->regs->usb_cmd,
 343                                                USB_CMD_STMODE |
 344                                                USB_STS_TMODE_SEL(tmode - 1));
 345                         break;
 346                 default:
 347                         ret = -EINVAL;
 348                 }
 349                 break;
 350         default:
 351                 ret = -EINVAL;
 352         }
 353
 354         return ret;
 355 }
 356
 357 static int cdns3_ep0_feature_handle_intf(struct cdns3_device *priv_dev,
 358                                          struct usb_ctrlrequest *ctrl,
 359                                          int set)
 360 {
 361         u32 wValue;
 362         int ret = 0;
 363
 364         wValue = le16_to_cpu(ctrl->wValue);
 365
 366         switch (wValue) {
 367         case USB_INTRF_FUNC_SUSPEND:
 368                 break;
 369         default:
 370                 ret = -EINVAL;
 371         }
 372
 373         return ret;
 374 }
 375
 376 static int cdns3_ep0_feature_handle_endpoint(struct cdns3_device *priv_dev,
 377                                              struct usb_ctrlrequest *ctrl,
 378                                              int set)
 379 {
 380         struct cdns3_endpoint *priv_ep;
 381         int ret = 0;
 382         u8 index;
 383
 384         if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
 385                 return -EINVAL;
 386
 387         if (!(ctrl->wIndex & ~USB_DIR_IN))
 388                 return 0;
 389
 390         index = cdns3_ep_addr_to_index(ctrl->wIndex);
 391         priv_ep = priv_dev->eps[index];
 392
 393         cdns3_select_ep(priv_dev, ctrl->wIndex);
 394
 395         if (set)
 396                 __cdns3_gadget_ep_set_halt(priv_ep);
 397         else if (!(priv_ep->flags & EP_WEDGE))
 398                 ret = __cdns3_gadget_ep_clear_halt(priv_ep);
 399
 400         cdns3_select_ep(priv_dev, 0x00);
 401
 402         return ret;
 403 }
 404
 405 /**
 406  * cdns3_req_ep0_handle_feature -
 407  * Handling of GET/SET_FEATURE standard USB request
 408  *
 409  * @priv_dev: extended gadget object
 410  * @ctrl_req: pointer to received setup packet
 411  * @set: must be set to 1 for SET_FEATURE request
 412  *
 413  * Returns 0 if success, error code on error
 414  */
 415 static int cdns3_req_ep0_handle_feature(struct cdns3_device *priv_dev,
 416                                         struct usb_ctrlrequest *ctrl,
 417                                         int set)
 418 {
 419         int ret = 0;
 420         u32 recip;
 421
 422         recip = ctrl->bRequestType & USB_RECIP_MASK;
 423
 424         switch (recip) {
 425         case USB_RECIP_DEVICE:
 426                 ret = cdns3_ep0_feature_handle_device(priv_dev, ctrl, set);
 427                 break;
 428         case USB_RECIP_INTERFACE:
 429                 ret = cdns3_ep0_feature_handle_intf(priv_dev, ctrl, set);
 430                 break;
 431         case USB_RECIP_ENDPOINT:
 432                 ret = cdns3_ep0_feature_handle_endpoint(priv_dev, ctrl, set);
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         return ret;
 439 }
 440
 441 /**
 442  * cdns3_req_ep0_set_sel - Handling of SET_SEL standard USB request
 443  * @priv_dev: extended gadget object
 444  * @ctrl_req: pointer to received setup packet
 445  *
 446  * Returns 0 if success, error code on error
 447  */
 448 static int cdns3_req_ep0_set_sel(struct cdns3_device *priv_dev,
 449                                  struct usb_ctrlrequest *ctrl_req)
 450 {
 451         if (priv_dev->gadget.state < USB_STATE_ADDRESS)
 452                 return -EINVAL;
 453
 454         if (ctrl_req->wLength != 6) {
 455                 dev_err(priv_dev->dev, "Set SEL should be 6 bytes, got %d\n",
 456                         ctrl_req->wLength);
 457                 return -EINVAL;
 458         }
 459
 460         cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma, 6, 1, 0);
 461         return 0;
 462 }
 463
 464 /**
 465  * cdns3_req_ep0_set_isoch_delay -
 466  * Handling of GET_ISOCH_DELAY standard USB request
 467  * @priv_dev: extended gadget object
 468  * @ctrl_req: pointer to received setup packet
 469  *
 470  * Returns 0 if success, error code on error
 471  */
 472 static int cdns3_req_ep0_set_isoch_delay(struct cdns3_device *priv_dev,
 473                                          struct usb_ctrlrequest *ctrl_req)
 474 {
 475         if (ctrl_req->wIndex || ctrl_req->wLength)
 476                 return -EINVAL;
 477
 478         priv_dev->isoch_delay = ctrl_req->wValue;
 479
 480         return 0;
 481 }
 482
 483 /**
 484  * cdns3_ep0_standard_request - Handling standard USB requests
 485  * @priv_dev: extended gadget object
 486  * @ctrl_req: pointer to received setup packet
 487  *
 488  * Returns 0 if success, error code on error
 489  */
 490 static int cdns3_ep0_standard_request(struct cdns3_device *priv_dev,
 491                                       struct usb_ctrlrequest *ctrl_req)
 492 {
 493         int ret;
 494
 495         switch (ctrl_req->bRequest) {
 496         case USB_REQ_SET_ADDRESS:
 497                 ret = cdns3_req_ep0_set_address(priv_dev, ctrl_req);
 498                 break;
 499         case USB_REQ_SET_CONFIGURATION:
 500                 ret = cdns3_req_ep0_set_configuration(priv_dev, ctrl_req);
 501                 break;
 502         case USB_REQ_GET_STATUS:
 503                 ret = cdns3_req_ep0_get_status(priv_dev, ctrl_req);
 504                 break;
 505         case USB_REQ_CLEAR_FEATURE:
 506                 ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 0);
 507                 break;
 508         case USB_REQ_SET_FEATURE:
 509                 ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 1);
 510                 break;
 511         case USB_REQ_SET_SEL:
 512                 ret = cdns3_req_ep0_set_sel(priv_dev, ctrl_req);
 513                 break;
 514         case USB_REQ_SET_ISOCH_DELAY:
 515                 ret = cdns3_req_ep0_set_isoch_delay(priv_dev, ctrl_req);
 516                 break;
 517         default:
 518                 ret = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
 519                 break;
 520         }
 521
 522         return ret;
 523 }
 524
 525 static void __pending_setup_status_handler(struct cdns3_device *priv_dev)
 526 {
 527         struct usb_request *request = priv_dev->pending_status_request;
 528
 529         if (priv_dev->status_completion_no_call && request &&
 530             request->complete) {
 531                 request->complete(&priv_dev->eps[0]->endpoint, request);
 532                 priv_dev->status_completion_no_call = 0;
 533         }
 534 }
 535
 536 void cdns3_pending_setup_status_handler(struct work_struct *work)
 537 {
 538         struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
 539                         pending_status_wq);
 540         unsigned long flags;
 541
 542         spin_lock_irqsave(&priv_dev->lock, flags);
 543         __pending_setup_status_handler(priv_dev);
 544         spin_unlock_irqrestore(&priv_dev->lock, flags);
 545 }
 546
 547 /**
 548  * cdns3_ep0_setup_phase - Handling setup USB requests
 549  * @priv_dev: extended gadget object
 550  */
 551 static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
 552 {
 553         struct usb_ctrlrequest *ctrl = priv_dev->setup_buf;
 554         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 555         int result;
 556
 557         priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;
 558
 559         trace_cdns3_ctrl_req(ctrl);
 560
 561         if (!list_empty(&priv_ep->pending_req_list)) {
 562                 struct usb_request *request;
 563
 564                 request = cdns3_next_request(&priv_ep->pending_req_list);
 565                 priv_ep->dir = priv_dev->ep0_data_dir;
 566                 cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
 567                                       -ECONNRESET);
 568         }
 569
 570         if (le16_to_cpu(ctrl->wLength))
 571                 priv_dev->ep0_stage = CDNS3_DATA_STAGE;
 572         else
 573                 priv_dev->ep0_stage = CDNS3_STATUS_STAGE;
 574
 575         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 576                 result = cdns3_ep0_standard_request(priv_dev, ctrl);
 577         else
 578                 result = cdns3_ep0_delegate_req(priv_dev, ctrl);
 579
 580         if (result == USB_GADGET_DELAYED_STATUS)
 581                 return;
 582
 583         if (result < 0)
 584                 cdns3_ep0_complete_setup(priv_dev, 1, 1);
 585         else if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE)
 586                 cdns3_ep0_complete_setup(priv_dev, 0, 1);
 587 }
 588
 589 static void cdns3_transfer_completed(struct cdns3_device *priv_dev)
 590 {
 591         struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 592
 593         if (!list_empty(&priv_ep->pending_req_list)) {
 594                 struct usb_request *request;
 595
 596                 trace_cdns3_complete_trb(priv_ep, priv_ep->trb_pool);
 597                 request = cdns3_next_request(&priv_ep->pending_req_list);
 598
 599                 request->actual =
 600                         TRB_LEN(le32_to_cpu(priv_ep->trb_pool->length));
 601
 602                 priv_ep->dir = priv_dev->ep0_data_dir;
 603                 cdns3_gadget_giveback(priv_ep, to_cdns3_request(request), 0);
 604         }
 605
 606         cdns3_ep0_complete_setup(priv_dev, 0, 0);
 607 }
 608
 609 /**
 610  * cdns3_check_new_setup - Check if controller receive new SETUP packet.
 611  * @priv_dev: extended gadget object
 612  *
 613  * The SETUP packet can be kept in on-chip memory or in system memory.
 614  */
 615 static bool cdns3_check_new_setup(struct cdns3_device *priv_dev)
 616 {
 617         u32 ep_sts_reg;
 618
 619         cdns3_select_ep(priv_dev, 0 | USB_DIR_OUT);
 620         ep_sts_reg = readl(&priv_dev->regs->ep_sts);
 621
 622         return !!(ep_sts_reg & (EP_STS_SETUP | EP_STS_STPWAIT));
 623 }
 624
 625 /**
 626  * cdns3_check_ep0_interrupt_proceed - Processes interrupt related to endpoint 0
 627  * @priv_dev: extended gadget object
 628  * @dir: USB_DIR_IN for IN direction, USB_DIR_OUT for OUT direction
 629  */
 630 void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
 631 {
 632         u32 ep_sts_reg;
 633
 634         cdns3_select_ep(priv_dev, dir);
 635
 636         ep_sts_reg = readl(&priv_dev->regs->ep_sts);
 637         writel(ep_sts_reg, &priv_dev->regs->ep_sts);
 638
 639         trace_cdns3_ep0_irq(priv_dev, ep_sts_reg);
 640
 641         __pending_setup_status_handler(priv_dev);
 642
 643         if (ep_sts_reg & EP_STS_SETUP)
 644                 priv_dev->wait_for_setup = 1;
 645
 646         if (priv_dev->wait_for_setup && ep_sts_reg & EP_STS_IOC) {
 647                 priv_dev->wait_for_setup = 0;
 648                 cdns3_allow_enable_l1(priv_dev, 0);
 649                 cdns3_ep0_setup_phase(priv_dev);
 650         } else if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
 651                 priv_dev->ep0_data_dir = dir;
 652                 cdns3_transfer_completed(priv_dev);
 653         }
 654
 655         if (ep_sts_reg & EP_STS_DESCMIS) {
 656                 if (dir == 0 && !priv_dev->setup_pending)
 657                         cdns3_prepare_setup_packet(priv_dev);
 658         }
 659 }
 660
 661 /**
 662  * cdns3_gadget_ep0_enable
 663  * Function shouldn't be called by gadget driver,
 664  * endpoint 0 is allways active
 665  */
 666 static int cdns3_gadget_ep0_enable(struct usb_ep *ep,
 667                                    const struct usb_endpoint_descriptor *desc)
 668 {
 669         return -EINVAL;
 670 }
 671
 672 /**
 673  * cdns3_gadget_ep0_disable
 674  * Function shouldn't be called by gadget driver,
 675  * endpoint 0 is allways active
 676  */
 677 static int cdns3_gadget_ep0_disable(struct usb_ep *ep)
 678 {
 679         return -EINVAL;
 680 }
 681
 682 /**
 683  * cdns3_gadget_ep0_set_halt
 684  * @ep: pointer to endpoint zero object
 685  * @value: 1 for set stall, 0 for clear stall
 686  *
 687  * Returns 0
 688  */
 689 static int cdns3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 690 {
 691         /* TODO */
 692         return 0;
 693 }
 694
 695 /**
 696  * cdns3_gadget_ep0_queue Transfer data on endpoint zero
 697  * @ep: pointer to endpoint zero object
 698  * @request: pointer to request object
 699  * @gfp_flags: gfp flags
 700  *
 701  * Returns 0 on success, error code elsewhere
 702  */
 703 static int cdns3_gadget_ep0_queue(struct usb_ep *ep,
 704                                   struct usb_request *request,
 705                                   gfp_t gfp_flags)
 706 {
 707         struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
 708         struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
 709         unsigned long flags;
 710         int erdy_sent = 0;
 711         int ret = 0;
 712         u8 zlp = 0;
 713
 714         trace_cdns3_ep0_queue(priv_dev, request);
 715
 716         /* cancel the request if controller receive new SETUP packet. */
 717         if (cdns3_check_new_setup(priv_dev))
 718                 return -ECONNRESET;
 719
 720         /* send STATUS stage. Should be called only for SET_CONFIGURATION */
 721         if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
 722                 spin_lock_irqsave(&priv_dev->lock, flags);
 723                 cdns3_select_ep(priv_dev, 0x00);
 724
 725                 erdy_sent = !priv_dev->hw_configured_flag;
 726                 cdns3_set_hw_configuration(priv_dev);
 727
 728                 if (!erdy_sent)
 729                         cdns3_ep0_complete_setup(priv_dev, 0, 1);
 730
 731                 cdns3_allow_enable_l1(priv_dev, 1);
 732
 733                 request->actual = 0;
 734                 priv_dev->status_completion_no_call = true;
 735                 priv_dev->pending_status_request = request;
 736                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 737
 738                 /*
 739                  * Since there is no completion interrupt for status stage,
 740                  * it needs to call ->completion in software after
 741                  * ep0_queue is back.
 742                  */
 743                 queue_work(system_freezable_wq, &priv_dev->pending_status_wq);
 744                 return 0;
 745         }
 746
 747         spin_lock_irqsave(&priv_dev->lock, flags);
 748         if (!list_empty(&priv_ep->pending_req_list)) {
 749                 dev_err(priv_dev->dev,
 750                         "can't handle multiple requests for ep0\n");
 751                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 752                 return -EBUSY;
 753         }
 754
 755         ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
 756                                             priv_dev->ep0_data_dir);
 757         if (ret) {
 758                 spin_unlock_irqrestore(&priv_dev->lock, flags);
 759                 dev_err(priv_dev->dev, "failed to map request\n");
 760                 return -EINVAL;
 761         }
 762
 763         request->status = -EINPROGRESS;
 764         list_add_tail(&request->list, &priv_ep->pending_req_list);
 765
 766         if (request->zero && request->length &&
 767             (request->length % ep->maxpacket == 0))
 768                 zlp = 1;
 769
 770         cdns3_ep0_run_transfer(priv_dev, request->dma, request->length, 1, zlp);
 771
 772         spin_unlock_irqrestore(&priv_dev->lock, flags);
 773
 774         return ret;
 775 }
 776
 777 /**
 778  * cdns3_gadget_ep_set_wedge Set wedge on selected endpoint
 779  * @ep: endpoint object
 780  *
 781  * Returns 0
 782  */
 783 int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
 784 {
 785         struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
 786         struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
 787
 788         dev_dbg(priv_dev->dev, "Wedge for %s\n", ep->name);
 789         cdns3_gadget_ep_set_halt(ep, 1);
 790         priv_ep->flags |= EP_WEDGE;
 791
 792         return 0;
 793 }
 794
 795 const struct usb_ep_ops cdns3_gadget_ep0_ops = {
 796         .enable = cdns3_gadget_ep0_enable,
 797         .disable = cdns3_gadget_ep0_disable,
 798         .alloc_request = cdns3_gadget_ep_alloc_request,
 799         .free_request = cdns3_gadget_ep_free_request,
 800         .queue = cdns3_gadget_ep0_queue,
 801         .dequeue = cdns3_gadget_ep_dequeue,
 802         .set_halt = cdns3_gadget_ep0_set_halt,
 803         .set_wedge = cdns3_gadget_ep_set_wedge,
 804 };
 805
 806 /**
 807  * cdns3_ep0_config - Configures default endpoint
 808  * @priv_dev: extended gadget object
 809  *
 810  * Functions sets parameters: maximal packet size and enables interrupts
 811  */
 812 void cdns3_ep0_config(struct cdns3_device *priv_dev)
 813 {
 814         struct cdns3_usb_regs __iomem *regs;
 815         struct cdns3_endpoint *priv_ep;
 816         u32 max_packet_size = 64;
 817
 818         regs = priv_dev->regs;
 819
 820         if (priv_dev->gadget.speed == USB_SPEED_SUPER)
 821                 max_packet_size = 512;
 822
 823         priv_ep = priv_dev->eps[0];
 824
 825         if (!list_empty(&priv_ep->pending_req_list)) {
 826                 struct usb_request *request;
 827
 828                 request = cdns3_next_request(&priv_ep->pending_req_list);
 829                 list_del_init(&request->list);
 830         }
 831
 832         priv_dev->u1_allowed = 0;
 833         priv_dev->u2_allowed = 0;
 834
 835         priv_dev->gadget.ep0->maxpacket = max_packet_size;
 836         cdns3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(max_packet_size);
 837
 838         /* init ep out */
 839         cdns3_select_ep(priv_dev, USB_DIR_OUT);
 840
 841         if (priv_dev->dev_ver >= DEV_VER_V3) {
 842                 cdns3_set_register_bit(&priv_dev->regs->dtrans,
 843                                        BIT(0) | BIT(16));
 844                 cdns3_set_register_bit(&priv_dev->regs->tdl_from_trb,
 845                                        BIT(0) | BIT(16));
 846         }
 847
 848         writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
 849                &regs->ep_cfg);
 850
 851         writel(EP_STS_EN_SETUPEN | EP_STS_EN_DESCMISEN | EP_STS_EN_TRBERREN,
 852                &regs->ep_sts_en);
 853
 854         /* init ep in */
 855         cdns3_select_ep(priv_dev, USB_DIR_IN);
 856
 857         writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
 858                &regs->ep_cfg);
 859
 860         writel(EP_STS_EN_SETUPEN | EP_STS_EN_TRBERREN, &regs->ep_sts_en);
 861
 862         cdns3_set_register_bit(&regs->usb_conf, USB_CONF_U1DS | USB_CONF_U2DS);
 863 }
 864
 865 /**
 866  * cdns3_init_ep0 Initializes software endpoint 0 of gadget
 867  * @priv_dev: extended gadget object
 868  * @ep_priv: extended endpoint object
 869  *
 870  * Returns 0 on success else error code.
 871  */
 872 int cdns3_init_ep0(struct cdns3_device *priv_dev,
 873                    struct cdns3_endpoint *priv_ep)
 874 {
 875         sprintf(priv_ep->name, "ep0");
 876
 877         /* fill linux fields */
 878         priv_ep->endpoint.ops = &cdns3_gadget_ep0_ops;
 879         priv_ep->endpoint.maxburst = 1;
 880         usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
 881                                    CDNS3_EP0_MAX_PACKET_LIMIT);
 882         priv_ep->endpoint.address = 0;
 883         priv_ep->endpoint.caps.type_control = 1;
 884         priv_ep->endpoint.caps.dir_in = 1;
 885         priv_ep->endpoint.caps.dir_out = 1;
 886         priv_ep->endpoint.name = priv_ep->name;
 887         priv_ep->endpoint.desc = &cdns3_gadget_ep0_desc;
 888         priv_dev->gadget.ep0 = &priv_ep->endpoint;
 889         priv_ep->type = USB_ENDPOINT_XFER_CONTROL;
 890
 891         return cdns3_allocate_trb_pool(priv_ep);
 892 }