drivers/usb/cdns3/cdnsp-ep0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence CDNSP DRD Driver.
   4  *
   5  * Copyright (C) 2020 Cadence.
   6  *
   7  * Author: Pawel Laszczak <pawell@cadence.com>
   8  *
   9  */
  10
  11 #include <linux/usb/composite.h>
  12 #include <linux/usb/gadget.h>
  13 #include <linux/list.h>
  14
  15 #include "cdnsp-gadget.h"
  16 #include "cdnsp-trace.h"
  17
  18 static void cdnsp_ep0_stall(struct cdnsp_device *pdev)
  19 {
  20         struct cdnsp_request *preq;
  21         struct cdnsp_ep *pep;
  22
  23         pep = &pdev->eps[0];
  24         preq = next_request(&pep->pending_list);
  25
  26         if (pdev->three_stage_setup) {
  27                 cdnsp_halt_endpoint(pdev, pep, true);
  28
  29                 if (preq)
  30                         cdnsp_gadget_giveback(pep, preq, -ECONNRESET);
  31         } else {
  32                 pep->ep_state |= EP0_HALTED_STATUS;
  33
  34                 if (preq)
  35                         list_del(&preq->list);
  36
  37                 cdnsp_status_stage(pdev);
  38         }
  39 }
  40
  41 static int cdnsp_ep0_delegate_req(struct cdnsp_device *pdev,
  42                                   struct usb_ctrlrequest *ctrl)
  43 {
  44         int ret;
  45
  46         spin_unlock(&pdev->lock);
  47         ret = pdev->gadget_driver->setup(&pdev->gadget, ctrl);
  48         spin_lock(&pdev->lock);
  49
  50         return ret;
  51 }
  52
  53 static int cdnsp_ep0_set_config(struct cdnsp_device *pdev,
  54                                 struct usb_ctrlrequest *ctrl)
  55 {
  56         enum usb_device_state state = pdev->gadget.state;
  57         u32 cfg;
  58         int ret;
  59
  60         cfg = le16_to_cpu(ctrl->wValue);
  61
  62         switch (state) {
  63         case USB_STATE_ADDRESS:
  64                 trace_cdnsp_ep0_set_config("from Address state");
  65                 break;
  66         case USB_STATE_CONFIGURED:
  67                 trace_cdnsp_ep0_set_config("from Configured state");
  68                 break;
  69         default:
  70                 dev_err(pdev->dev, "Set Configuration - bad device state\n");
  71                 return -EINVAL;
  72         }
  73
  74         ret = cdnsp_ep0_delegate_req(pdev, ctrl);
  75         if (ret)
  76                 return ret;
  77
  78         if (!cfg)
  79                 usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
  80
  81         return 0;
  82 }
  83
  84 static int cdnsp_ep0_set_address(struct cdnsp_device *pdev,
  85                                  struct usb_ctrlrequest *ctrl)
  86 {
  87         enum usb_device_state state = pdev->gadget.state;
  88         struct cdnsp_slot_ctx *slot_ctx;
  89         unsigned int slot_state;
  90         int ret;
  91         u32 addr;
  92
  93         addr = le16_to_cpu(ctrl->wValue);
  94
  95         if (addr > 127) {
  96                 dev_err(pdev->dev, "Invalid device address %d\n", addr);
  97                 return -EINVAL;
  98         }
  99
 100         slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
 101
 102         if (state == USB_STATE_CONFIGURED) {
 103                 dev_err(pdev->dev, "Can't Set Address from Configured State\n");
 104                 return -EINVAL;
 105         }
 106
 107         pdev->device_address = le16_to_cpu(ctrl->wValue);
 108
 109         slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
 110         slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
 111         if (slot_state == SLOT_STATE_ADDRESSED)
 112                 cdnsp_reset_device(pdev);
 113
 114         /*set device address*/
 115         ret = cdnsp_setup_device(pdev, SETUP_CONTEXT_ADDRESS);
 116         if (ret)
 117                 return ret;
 118
 119         if (addr)
 120                 usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
 121         else
 122                 usb_gadget_set_state(&pdev->gadget, USB_STATE_DEFAULT);
 123
 124         return 0;
 125 }
 126
 127 int cdnsp_status_stage(struct cdnsp_device *pdev)
 128 {
 129         pdev->ep0_stage = CDNSP_STATUS_STAGE;
 130         pdev->ep0_preq.request.length = 0;
 131
 132         return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
 133 }
 134
 135 static int cdnsp_w_index_to_ep_index(u16 wIndex)
 136 {
 137         if (!(wIndex & USB_ENDPOINT_NUMBER_MASK))
 138                 return 0;
 139
 140         return ((wIndex & USB_ENDPOINT_NUMBER_MASK) * 2) +
 141                 (wIndex & USB_ENDPOINT_DIR_MASK ? 1 : 0) - 1;
 142 }
 143
 144 static int cdnsp_ep0_handle_status(struct cdnsp_device *pdev,
 145                                    struct usb_ctrlrequest *ctrl)
 146 {
 147         struct cdnsp_ep *pep;
 148         __le16 *response;
 149         int ep_sts = 0;
 150         u16 status = 0;
 151         u32 recipient;
 152
 153         recipient = ctrl->bRequestType & USB_RECIP_MASK;
 154
 155         switch (recipient) {
 156         case USB_RECIP_DEVICE:
 157                 status = pdev->gadget.is_selfpowered;
 158                 status |= pdev->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
 159
 160                 if (pdev->gadget.speed >= USB_SPEED_SUPER) {
 161                         status |= pdev->u1_allowed << USB_DEV_STAT_U1_ENABLED;
 162                         status |= pdev->u2_allowed << USB_DEV_STAT_U2_ENABLED;
 163                 }
 164                 break;
 165         case USB_RECIP_INTERFACE:
 166                 /*
 167                  * Function Remote Wake Capable D0
 168                  * Function Remote Wakeup       D1
 169                  */
 170                 return cdnsp_ep0_delegate_req(pdev, ctrl);
 171         case USB_RECIP_ENDPOINT:
 172                 ep_sts = cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex));
 173                 pep = &pdev->eps[ep_sts];
 174                 ep_sts = GET_EP_CTX_STATE(pep->out_ctx);
 175
 176                 /* check if endpoint is stalled */
 177                 if (ep_sts == EP_STATE_HALTED)
 178                         status =  BIT(USB_ENDPOINT_HALT);
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183
 184         response = (__le16 *)pdev->setup_buf;
 185         *response = cpu_to_le16(status);
 186
 187         pdev->ep0_preq.request.length = sizeof(*response);
 188         pdev->ep0_preq.request.buf = pdev->setup_buf;
 189
 190         return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
 191 }
 192
 193 static void cdnsp_enter_test_mode(struct cdnsp_device *pdev)
 194 {
 195         u32 temp;
 196
 197         temp = readl(&pdev->active_port->regs->portpmsc) & ~GENMASK(31, 28);
 198         temp |= PORT_TEST_MODE(pdev->test_mode);
 199         writel(temp, &pdev->active_port->regs->portpmsc);
 200 }
 201
 202 static int cdnsp_ep0_handle_feature_device(struct cdnsp_device *pdev,
 203                                            struct usb_ctrlrequest *ctrl,
 204                                            int set)
 205 {
 206         enum usb_device_state state;
 207         enum usb_device_speed speed;
 208         u16 tmode;
 209
 210         state = pdev->gadget.state;
 211         speed = pdev->gadget.speed;
 212
 213         switch (le16_to_cpu(ctrl->wValue)) {
 214         case USB_DEVICE_REMOTE_WAKEUP:
 215                 pdev->may_wakeup = !!set;
 216                 trace_cdnsp_may_wakeup(set);
 217                 break;
 218         case USB_DEVICE_U1_ENABLE:
 219                 if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
 220                         return -EINVAL;
 221
 222                 pdev->u1_allowed = !!set;
 223                 trace_cdnsp_u1(set);
 224                 break;
 225         case USB_DEVICE_U2_ENABLE:
 226                 if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
 227                         return -EINVAL;
 228
 229                 pdev->u2_allowed = !!set;
 230                 trace_cdnsp_u2(set);
 231                 break;
 232         case USB_DEVICE_LTM_ENABLE:
 233                 return -EINVAL;
 234         case USB_DEVICE_TEST_MODE:
 235                 if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
 236                         return -EINVAL;
 237
 238                 tmode = le16_to_cpu(ctrl->wIndex);
 239
 240                 if (!set || (tmode & 0xff) != 0)
 241                         return -EINVAL;
 242
 243                 tmode = tmode >> 8;
 244
 245                 if (tmode > USB_TEST_FORCE_ENABLE || tmode < USB_TEST_J)
 246                         return -EINVAL;
 247
 248                 pdev->test_mode = tmode;
 249
 250                 /*
 251                  * Test mode must be set before Status Stage but controller
 252                  * will start testing sequence after Status Stage.
 253                  */
 254                 cdnsp_enter_test_mode(pdev);
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int cdnsp_ep0_handle_feature_intf(struct cdnsp_device *pdev,
 264                                          struct usb_ctrlrequest *ctrl,
 265                                          int set)
 266 {
 267         u16 wValue, wIndex;
 268         int ret;
 269
 270         wValue = le16_to_cpu(ctrl->wValue);
 271         wIndex = le16_to_cpu(ctrl->wIndex);
 272
 273         switch (wValue) {
 274         case USB_INTRF_FUNC_SUSPEND:
 275                 ret = cdnsp_ep0_delegate_req(pdev, ctrl);
 276                 if (ret)
 277                         return ret;
 278
 279                 /*
 280                  * Remote wakeup is enabled when any function within a device
 281                  * is enabled for function remote wakeup.
 282                  */
 283                 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
 284                         pdev->may_wakeup++;
 285                 else
 286                         if (pdev->may_wakeup > 0)
 287                                 pdev->may_wakeup--;
 288
 289                 return 0;
 290         default:
 291                 return -EINVAL;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static int cdnsp_ep0_handle_feature_endpoint(struct cdnsp_device *pdev,
 298                                              struct usb_ctrlrequest *ctrl,
 299                                              int set)
 300 {
 301         struct cdnsp_ep *pep;
 302         u16 wValue;
 303
 304         wValue = le16_to_cpu(ctrl->wValue);
 305         pep = &pdev->eps[cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex))];
 306
 307         switch (wValue) {
 308         case USB_ENDPOINT_HALT:
 309                 if (!set && (pep->ep_state & EP_WEDGE)) {
 310                         /* Resets Sequence Number */
 311                         cdnsp_halt_endpoint(pdev, pep, 0);
 312                         cdnsp_halt_endpoint(pdev, pep, 1);
 313                         break;
 314                 }
 315
 316                 return cdnsp_halt_endpoint(pdev, pep, set);
 317         default:
 318                 dev_warn(pdev->dev, "WARN Incorrect wValue %04x\n", wValue);
 319                 return -EINVAL;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int cdnsp_ep0_handle_feature(struct cdnsp_device *pdev,
 326                                     struct usb_ctrlrequest *ctrl,
 327                                     int set)
 328 {
 329         switch (ctrl->bRequestType & USB_RECIP_MASK) {
 330         case USB_RECIP_DEVICE:
 331                 return cdnsp_ep0_handle_feature_device(pdev, ctrl, set);
 332         case USB_RECIP_INTERFACE:
 333                 return cdnsp_ep0_handle_feature_intf(pdev, ctrl, set);
 334         case USB_RECIP_ENDPOINT:
 335                 return cdnsp_ep0_handle_feature_endpoint(pdev, ctrl, set);
 336         default:
 337                 return -EINVAL;
 338         }
 339 }
 340
 341 static int cdnsp_ep0_set_sel(struct cdnsp_device *pdev,
 342                              struct usb_ctrlrequest *ctrl)
 343 {
 344         enum usb_device_state state = pdev->gadget.state;
 345         u16 wLength;
 346
 347         if (state == USB_STATE_DEFAULT)
 348                 return -EINVAL;
 349
 350         wLength = le16_to_cpu(ctrl->wLength);
 351
 352         if (wLength != 6) {
 353                 dev_err(pdev->dev, "Set SEL should be 6 bytes, got %d\n",
 354                         wLength);
 355                 return -EINVAL;
 356         }
 357
 358         /*
 359          * To handle Set SEL we need to receive 6 bytes from Host. So let's
 360          * queue a usb_request for 6 bytes.
 361          */
 362         pdev->ep0_preq.request.length = 6;
 363         pdev->ep0_preq.request.buf = pdev->setup_buf;
 364
 365         return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
 366 }
 367
 368 static int cdnsp_ep0_set_isoch_delay(struct cdnsp_device *pdev,
 369                                      struct usb_ctrlrequest *ctrl)
 370 {
 371         if (le16_to_cpu(ctrl->wIndex) || le16_to_cpu(ctrl->wLength))
 372                 return -EINVAL;
 373
 374         pdev->gadget.isoch_delay = le16_to_cpu(ctrl->wValue);
 375
 376         return 0;
 377 }
 378
 379 static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
 380                                  struct usb_ctrlrequest *ctrl)
 381 {
 382         int ret;
 383
 384         switch (ctrl->bRequest) {
 385         case USB_REQ_GET_STATUS:
 386                 ret = cdnsp_ep0_handle_status(pdev, ctrl);
 387                 break;
 388         case USB_REQ_CLEAR_FEATURE:
 389                 ret = cdnsp_ep0_handle_feature(pdev, ctrl, 0);
 390                 break;
 391         case USB_REQ_SET_FEATURE:
 392                 ret = cdnsp_ep0_handle_feature(pdev, ctrl, 1);
 393                 break;
 394         case USB_REQ_SET_ADDRESS:
 395                 ret = cdnsp_ep0_set_address(pdev, ctrl);
 396                 break;
 397         case USB_REQ_SET_CONFIGURATION:
 398                 ret = cdnsp_ep0_set_config(pdev, ctrl);
 399                 break;
 400         case USB_REQ_SET_SEL:
 401                 ret = cdnsp_ep0_set_sel(pdev, ctrl);
 402                 break;
 403         case USB_REQ_SET_ISOCH_DELAY:
 404                 ret = cdnsp_ep0_set_isoch_delay(pdev, ctrl);
 405                 break;
 406         default:
 407                 ret = cdnsp_ep0_delegate_req(pdev, ctrl);
 408                 break;
 409         }
 410
 411         return ret;
 412 }
 413
 414 void cdnsp_setup_analyze(struct cdnsp_device *pdev)
 415 {
 416         struct usb_ctrlrequest *ctrl = &pdev->setup;
 417         int ret = -EINVAL;
 418         u16 len;
 419
 420         trace_cdnsp_ctrl_req(ctrl);
 421
 422         if (!pdev->gadget_driver)
 423                 goto out;
 424
 425         if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
 426                 dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
 427                 goto out;
 428         }
 429
 430         /* Restore the ep0 to Stopped/Running state. */
 431         if (pdev->eps[0].ep_state & EP_HALTED) {
 432                 trace_cdnsp_ep0_halted("Restore to normal state");
 433                 cdnsp_halt_endpoint(pdev, &pdev->eps[0], 0);
 434         }
 435
 436         /*
 437          * Finishing previous SETUP transfer by removing request from
 438          * list and informing upper layer
 439          */
 440         if (!list_empty(&pdev->eps[0].pending_list)) {
 441                 struct cdnsp_request    *req;
 442
 443                 trace_cdnsp_ep0_request("Remove previous");
 444                 req = next_request(&pdev->eps[0].pending_list);
 445                 cdnsp_ep_dequeue(&pdev->eps[0], req);
 446         }
 447
 448         len = le16_to_cpu(ctrl->wLength);
 449         if (!len) {
 450                 pdev->three_stage_setup = false;
 451                 pdev->ep0_expect_in = false;
 452         } else {
 453                 pdev->three_stage_setup = true;
 454                 pdev->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
 455         }
 456
 457         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 458                 ret = cdnsp_ep0_std_request(pdev, ctrl);
 459         else
 460                 ret = cdnsp_ep0_delegate_req(pdev, ctrl);
 461
 462         if (ret == USB_GADGET_DELAYED_STATUS) {
 463                 trace_cdnsp_ep0_status_stage("delayed");
 464                 return;
 465         }
 466 out:
 467         if (ret < 0)
 468                 cdnsp_ep0_stall(pdev);
 469         else if (!len && pdev->ep0_stage != CDNSP_STATUS_STAGE)
 470                 cdnsp_status_stage(pdev);
 471 }