1 /* 2 * Driver for the NXP ISP1761 device controller 3 * 4 * Copyright 2014 Ideas on Board Oy 5 * 6 * Contacts: 7 * Laurent Pinchart <laurent.pinchart@ideasonboard.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 */ 13 14 #include <linux/interrupt.h> 15 #include <linux/io.h> 16 #include <linux/kernel.h> 17 #include <linux/list.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/timer.h> 21 #include <linux/usb.h> 22 23 #include "isp1760-core.h" 24 #include "isp1760-regs.h" 25 #include "isp1760-udc.h" 26 27 #define ISP1760_VBUS_POLL_INTERVAL msecs_to_jiffies(500) 28 29 struct isp1760_request { 30 struct usb_request req; 31 struct list_head queue; 32 struct isp1760_ep *ep; 33 unsigned int packet_size; 34 }; 35 36 static inline struct isp1760_udc *gadget_to_udc(struct usb_gadget *gadget) 37 { 38 return container_of(gadget, struct isp1760_udc, gadget); 39 } 40 41 static inline struct isp1760_ep *ep_to_udc_ep(struct usb_ep *ep) 42 { 43 return container_of(ep, struct isp1760_ep, ep); 44 } 45 46 static inline struct isp1760_request *req_to_udc_req(struct usb_request *req) 47 { 48 return container_of(req, struct isp1760_request, req); 49 } 50 51 static inline u32 isp1760_udc_read(struct isp1760_udc *udc, u16 reg) 52 { 53 return isp1760_read32(udc->regs, reg); 54 } 55 56 static inline void isp1760_udc_write(struct isp1760_udc *udc, u16 reg, u32 val) 57 { 58 isp1760_write32(udc->regs, reg, val); 59 } 60 61 /* ----------------------------------------------------------------------------- 62 * Endpoint Management 63 */ 64 65 static struct isp1760_ep *isp1760_udc_find_ep(struct isp1760_udc *udc, 66 u16 index) 67 { 68 unsigned int i; 69 70 if (index == 0) 71 return &udc->ep[0]; 72 73 for (i = 1; i < ARRAY_SIZE(udc->ep); ++i) { 74 if (udc->ep[i].addr == index) 75 return udc->ep[i].desc ? &udc->ep[i] : NULL; 76 } 77 78 return NULL; 79 } 80 81 static void __isp1760_udc_select_ep(struct isp1760_ep *ep, int dir) 82 { 83 isp1760_udc_write(ep->udc, DC_EPINDEX, 84 DC_ENDPIDX(ep->addr & USB_ENDPOINT_NUMBER_MASK) | 85 (dir == USB_DIR_IN ? DC_EPDIR : 0)); 86 } 87 88 /** 89 * isp1760_udc_select_ep - Select an endpoint for register access 90 * @ep: The endpoint 91 * 92 * The ISP1761 endpoint registers are banked. This function selects the target 93 * endpoint for banked register access. The selection remains valid until the 94 * next call to this function, the next direct access to the EPINDEX register 95 * or the next reset, whichever comes first. 96 * 97 * Called with the UDC spinlock held. 98 */ 99 static void isp1760_udc_select_ep(struct isp1760_ep *ep) 100 { 101 __isp1760_udc_select_ep(ep, ep->addr & USB_ENDPOINT_DIR_MASK); 102 } 103 104 /* Called with the UDC spinlock held. */ 105 static void isp1760_udc_ctrl_send_status(struct isp1760_ep *ep, int dir) 106 { 107 struct isp1760_udc *udc = ep->udc; 108 109 /* 110 * Proceed to the status stage. The status stage data packet flows in 111 * the direction opposite to the data stage data packets, we thus need 112 * to select the OUT/IN endpoint for IN/OUT transfers. 113 */ 114 isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | 115 (dir == USB_DIR_IN ? 0 : DC_EPDIR)); 116 isp1760_udc_write(udc, DC_CTRLFUNC, DC_STATUS); 117 118 /* 119 * The hardware will terminate the request automatically and go back to 120 * the setup stage without notifying us. 121 */ 122 udc->ep0_state = ISP1760_CTRL_SETUP; 123 } 124 125 /* Called without the UDC spinlock held. */ 126 static void isp1760_udc_request_complete(struct isp1760_ep *ep, 127 struct isp1760_request *req, 128 int status) 129 { 130 struct isp1760_udc *udc = ep->udc; 131 unsigned long flags; 132 133 dev_dbg(ep->udc->isp->dev, "completing request %p with status %d\n", 134 req, status); 135 136 req->ep = NULL; 137 req->req.status = status; 138 req->req.complete(&ep->ep, &req->req); 139 140 spin_lock_irqsave(&udc->lock, flags); 141 142 /* 143 * When completing control OUT requests, move to the status stage after 144 * calling the request complete callback. This gives the gadget an 145 * opportunity to stall the control transfer if needed. 146 */ 147 if (status == 0 && ep->addr == 0 && udc->ep0_dir == USB_DIR_OUT) 148 isp1760_udc_ctrl_send_status(ep, USB_DIR_OUT); 149 150 spin_unlock_irqrestore(&udc->lock, flags); 151 } 152 153 static void isp1760_udc_ctrl_send_stall(struct isp1760_ep *ep) 154 { 155 struct isp1760_udc *udc = ep->udc; 156 unsigned long flags; 157 158 dev_dbg(ep->udc->isp->dev, "%s(ep%02x)\n", __func__, ep->addr); 159 160 spin_lock_irqsave(&udc->lock, flags); 161 162 /* Stall both the IN and OUT endpoints. */ 163 __isp1760_udc_select_ep(ep, USB_DIR_OUT); 164 isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); 165 __isp1760_udc_select_ep(ep, USB_DIR_IN); 166 isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); 167 168 /* A protocol stall completes the control transaction. */ 169 udc->ep0_state = ISP1760_CTRL_SETUP; 170 171 spin_unlock_irqrestore(&udc->lock, flags); 172 } 173 174 /* ----------------------------------------------------------------------------- 175 * Data Endpoints 176 */ 177 178 /* Called with the UDC spinlock held. */ 179 static bool isp1760_udc_receive(struct isp1760_ep *ep, 180 struct isp1760_request *req) 181 { 182 struct isp1760_udc *udc = ep->udc; 183 unsigned int len; 184 u32 *buf; 185 int i; 186 187 isp1760_udc_select_ep(ep); 188 len = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; 189 190 dev_dbg(udc->isp->dev, "%s: received %u bytes (%u/%u done)\n", 191 __func__, len, req->req.actual, req->req.length); 192 193 len = min(len, req->req.length - req->req.actual); 194 195 if (!len) { 196 /* 197 * There's no data to be read from the FIFO, acknowledge the RX 198 * interrupt by clearing the buffer. 199 * 200 * TODO: What if another packet arrives in the meantime ? The 201 * datasheet doesn't clearly document how this should be 202 * handled. 203 */ 204 isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); 205 return false; 206 } 207 208 buf = req->req.buf + req->req.actual; 209 210 /* 211 * Make sure not to read more than one extra byte, otherwise data from 212 * the next packet might be removed from the FIFO. 213 */ 214 for (i = len; i > 2; i -= 4, ++buf) 215 *buf = le32_to_cpu(isp1760_udc_read(udc, DC_DATAPORT)); 216 if (i > 0) 217 *(u16 *)buf = le16_to_cpu(readw(udc->regs + DC_DATAPORT)); 218 219 req->req.actual += len; 220 221 /* 222 * TODO: The short_not_ok flag isn't supported yet, but isn't used by 223 * any gadget driver either. 224 */ 225 226 dev_dbg(udc->isp->dev, 227 "%s: req %p actual/length %u/%u maxpacket %u packet size %u\n", 228 __func__, req, req->req.actual, req->req.length, ep->maxpacket, 229 len); 230 231 ep->rx_pending = false; 232 233 /* 234 * Complete the request if all data has been received or if a short 235 * packet has been received. 236 */ 237 if (req->req.actual == req->req.length || len < ep->maxpacket) { 238 list_del(&req->queue); 239 return true; 240 } 241 242 return false; 243 } 244 245 static void isp1760_udc_transmit(struct isp1760_ep *ep, 246 struct isp1760_request *req) 247 { 248 struct isp1760_udc *udc = ep->udc; 249 u32 *buf = req->req.buf + req->req.actual; 250 int i; 251 252 req->packet_size = min(req->req.length - req->req.actual, 253 ep->maxpacket); 254 255 dev_dbg(udc->isp->dev, "%s: transferring %u bytes (%u/%u done)\n", 256 __func__, req->packet_size, req->req.actual, 257 req->req.length); 258 259 __isp1760_udc_select_ep(ep, USB_DIR_IN); 260 261 if (req->packet_size) 262 isp1760_udc_write(udc, DC_BUFLEN, req->packet_size); 263 264 /* 265 * Make sure not to write more than one extra byte, otherwise extra data 266 * will stay in the FIFO and will be transmitted during the next control 267 * request. The endpoint control CLBUF bit is supposed to allow flushing 268 * the FIFO for this kind of conditions, but doesn't seem to work. 269 */ 270 for (i = req->packet_size; i > 2; i -= 4, ++buf) 271 isp1760_udc_write(udc, DC_DATAPORT, cpu_to_le32(*buf)); 272 if (i > 0) 273 writew(cpu_to_le16(*(u16 *)buf), udc->regs + DC_DATAPORT); 274 275 if (ep->addr == 0) 276 isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); 277 if (!req->packet_size) 278 isp1760_udc_write(udc, DC_CTRLFUNC, DC_VENDP); 279 } 280 281 static void isp1760_ep_rx_ready(struct isp1760_ep *ep) 282 { 283 struct isp1760_udc *udc = ep->udc; 284 struct isp1760_request *req; 285 bool complete; 286 287 spin_lock(&udc->lock); 288 289 if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_OUT) { 290 spin_unlock(&udc->lock); 291 dev_dbg(udc->isp->dev, "%s: invalid ep0 state %u\n", __func__, 292 udc->ep0_state); 293 return; 294 } 295 296 if (ep->addr != 0 && !ep->desc) { 297 spin_unlock(&udc->lock); 298 dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, 299 ep->addr); 300 return; 301 } 302 303 if (list_empty(&ep->queue)) { 304 ep->rx_pending = true; 305 spin_unlock(&udc->lock); 306 dev_dbg(udc->isp->dev, "%s: ep%02x (%p) has no request queued\n", 307 __func__, ep->addr, ep); 308 return; 309 } 310 311 req = list_first_entry(&ep->queue, struct isp1760_request, 312 queue); 313 complete = isp1760_udc_receive(ep, req); 314 315 spin_unlock(&udc->lock); 316 317 if (complete) 318 isp1760_udc_request_complete(ep, req, 0); 319 } 320 321 static void isp1760_ep_tx_complete(struct isp1760_ep *ep) 322 { 323 struct isp1760_udc *udc = ep->udc; 324 struct isp1760_request *complete = NULL; 325 struct isp1760_request *req; 326 bool need_zlp; 327 328 spin_lock(&udc->lock); 329 330 if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_IN) { 331 spin_unlock(&udc->lock); 332 dev_dbg(udc->isp->dev, "TX IRQ: invalid endpoint state %u\n", 333 udc->ep0_state); 334 return; 335 } 336 337 if (list_empty(&ep->queue)) { 338 /* 339 * This can happen for the control endpoint when the reply to 340 * the GET_STATUS IN control request is sent directly by the 341 * setup IRQ handler. Just proceed to the status stage. 342 */ 343 if (ep->addr == 0) { 344 isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); 345 spin_unlock(&udc->lock); 346 return; 347 } 348 349 spin_unlock(&udc->lock); 350 dev_dbg(udc->isp->dev, "%s: ep%02x has no request queued\n", 351 __func__, ep->addr); 352 return; 353 } 354 355 req = list_first_entry(&ep->queue, struct isp1760_request, 356 queue); 357 req->req.actual += req->packet_size; 358 359 need_zlp = req->req.actual == req->req.length && 360 !(req->req.length % ep->maxpacket) && 361 req->packet_size && req->req.zero; 362 363 dev_dbg(udc->isp->dev, 364 "TX IRQ: req %p actual/length %u/%u maxpacket %u packet size %u zero %u need zlp %u\n", 365 req, req->req.actual, req->req.length, ep->maxpacket, 366 req->packet_size, req->req.zero, need_zlp); 367 368 /* 369 * Complete the request if all data has been sent and we don't need to 370 * transmit a zero length packet. 371 */ 372 if (req->req.actual == req->req.length && !need_zlp) { 373 complete = req; 374 list_del(&req->queue); 375 376 if (ep->addr == 0) 377 isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); 378 379 if (!list_empty(&ep->queue)) 380 req = list_first_entry(&ep->queue, 381 struct isp1760_request, queue); 382 else 383 req = NULL; 384 } 385 386 /* 387 * Transmit the next packet or start the next request, if any. 388 * 389 * TODO: If the endpoint is stalled the next request shouldn't be 390 * started, but what about the next packet ? 391 */ 392 if (req) 393 isp1760_udc_transmit(ep, req); 394 395 spin_unlock(&udc->lock); 396 397 if (complete) 398 isp1760_udc_request_complete(ep, complete, 0); 399 } 400 401 static int __isp1760_udc_set_halt(struct isp1760_ep *ep, bool halt) 402 { 403 struct isp1760_udc *udc = ep->udc; 404 405 dev_dbg(udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, 406 halt ? "set" : "clear", ep->addr); 407 408 if (ep->desc && usb_endpoint_xfer_isoc(ep->desc)) { 409 dev_dbg(udc->isp->dev, "%s: ep%02x is isochronous\n", __func__, 410 ep->addr); 411 return -EINVAL; 412 } 413 414 isp1760_udc_select_ep(ep); 415 isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); 416 417 if (ep->addr == 0) { 418 /* When halting the control endpoint, stall both IN and OUT. */ 419 __isp1760_udc_select_ep(ep, USB_DIR_IN); 420 isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); 421 } else if (!halt) { 422 /* Reset the data PID by cycling the endpoint enable bit. */ 423 u16 eptype = isp1760_udc_read(udc, DC_EPTYPE); 424 425 isp1760_udc_write(udc, DC_EPTYPE, eptype & ~DC_EPENABLE); 426 isp1760_udc_write(udc, DC_EPTYPE, eptype); 427 428 /* 429 * Disabling the endpoint emptied the transmit FIFO, fill it 430 * again if a request is pending. 431 * 432 * TODO: Does the gadget framework require synchronizatino with 433 * the TX IRQ handler ? 434 */ 435 if ((ep->addr & USB_DIR_IN) && !list_empty(&ep->queue)) { 436 struct isp1760_request *req; 437 438 req = list_first_entry(&ep->queue, 439 struct isp1760_request, queue); 440 isp1760_udc_transmit(ep, req); 441 } 442 } 443 444 ep->halted = halt; 445 446 return 0; 447 } 448 449 /* ----------------------------------------------------------------------------- 450 * Control Endpoint 451 */ 452 453 static int isp1760_udc_get_status(struct isp1760_udc *udc, 454 const struct usb_ctrlrequest *req) 455 { 456 struct isp1760_ep *ep; 457 u16 status; 458 459 if (req->wLength != cpu_to_le16(2) || req->wValue != cpu_to_le16(0)) 460 return -EINVAL; 461 462 switch (req->bRequestType) { 463 case USB_DIR_IN | USB_RECIP_DEVICE: 464 status = udc->devstatus; 465 break; 466 467 case USB_DIR_IN | USB_RECIP_INTERFACE: 468 status = 0; 469 break; 470 471 case USB_DIR_IN | USB_RECIP_ENDPOINT: 472 ep = isp1760_udc_find_ep(udc, le16_to_cpu(req->wIndex)); 473 if (!ep) 474 return -EINVAL; 475 476 status = 0; 477 if (ep->halted) 478 status |= 1 << USB_ENDPOINT_HALT; 479 break; 480 481 default: 482 return -EINVAL; 483 } 484 485 isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | DC_EPDIR); 486 isp1760_udc_write(udc, DC_BUFLEN, 2); 487 488 writew(cpu_to_le16(status), udc->regs + DC_DATAPORT); 489 490 isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); 491 492 dev_dbg(udc->isp->dev, "%s: status 0x%04x\n", __func__, status); 493 494 return 0; 495 } 496 497 static int isp1760_udc_set_address(struct isp1760_udc *udc, u16 addr) 498 { 499 if (addr > 127) { 500 dev_dbg(udc->isp->dev, "invalid device address %u\n", addr); 501 return -EINVAL; 502 } 503 504 if (udc->gadget.state != USB_STATE_DEFAULT && 505 udc->gadget.state != USB_STATE_ADDRESS) { 506 dev_dbg(udc->isp->dev, "can't set address in state %u\n", 507 udc->gadget.state); 508 return -EINVAL; 509 } 510 511 usb_gadget_set_state(&udc->gadget, addr ? USB_STATE_ADDRESS : 512 USB_STATE_DEFAULT); 513 514 isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN | addr); 515 516 spin_lock(&udc->lock); 517 isp1760_udc_ctrl_send_status(&udc->ep[0], USB_DIR_OUT); 518 spin_unlock(&udc->lock); 519 520 return 0; 521 } 522 523 static bool isp1760_ep0_setup_standard(struct isp1760_udc *udc, 524 struct usb_ctrlrequest *req) 525 { 526 bool stall; 527 528 switch (req->bRequest) { 529 case USB_REQ_GET_STATUS: 530 return isp1760_udc_get_status(udc, req); 531 532 case USB_REQ_CLEAR_FEATURE: 533 switch (req->bRequestType) { 534 case USB_DIR_OUT | USB_RECIP_DEVICE: { 535 /* TODO: Handle remote wakeup feature. */ 536 return true; 537 } 538 539 case USB_DIR_OUT | USB_RECIP_ENDPOINT: { 540 u16 index = le16_to_cpu(req->wIndex); 541 struct isp1760_ep *ep; 542 543 if (req->wLength != cpu_to_le16(0) || 544 req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) 545 return true; 546 547 ep = isp1760_udc_find_ep(udc, index); 548 if (!ep) 549 return true; 550 551 spin_lock(&udc->lock); 552 553 /* 554 * If the endpoint is wedged only the gadget can clear 555 * the halt feature. Pretend success in that case, but 556 * keep the endpoint halted. 557 */ 558 if (!ep->wedged) 559 stall = __isp1760_udc_set_halt(ep, false); 560 else 561 stall = false; 562 563 if (!stall) 564 isp1760_udc_ctrl_send_status(&udc->ep[0], 565 USB_DIR_OUT); 566 567 spin_unlock(&udc->lock); 568 return stall; 569 } 570 571 default: 572 return true; 573 } 574 break; 575 576 case USB_REQ_SET_FEATURE: 577 switch (req->bRequestType) { 578 case USB_DIR_OUT | USB_RECIP_DEVICE: { 579 /* TODO: Handle remote wakeup and test mode features */ 580 return true; 581 } 582 583 case USB_DIR_OUT | USB_RECIP_ENDPOINT: { 584 u16 index = le16_to_cpu(req->wIndex); 585 struct isp1760_ep *ep; 586 587 if (req->wLength != cpu_to_le16(0) || 588 req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) 589 return true; 590 591 ep = isp1760_udc_find_ep(udc, index); 592 if (!ep) 593 return true; 594 595 spin_lock(&udc->lock); 596 597 stall = __isp1760_udc_set_halt(ep, true); 598 if (!stall) 599 isp1760_udc_ctrl_send_status(&udc->ep[0], 600 USB_DIR_OUT); 601 602 spin_unlock(&udc->lock); 603 return stall; 604 } 605 606 default: 607 return true; 608 } 609 break; 610 611 case USB_REQ_SET_ADDRESS: 612 if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) 613 return true; 614 615 return isp1760_udc_set_address(udc, le16_to_cpu(req->wValue)); 616 617 case USB_REQ_SET_CONFIGURATION: 618 if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) 619 return true; 620 621 if (udc->gadget.state != USB_STATE_ADDRESS && 622 udc->gadget.state != USB_STATE_CONFIGURED) 623 return true; 624 625 stall = udc->driver->setup(&udc->gadget, req) < 0; 626 if (stall) 627 return true; 628 629 usb_gadget_set_state(&udc->gadget, req->wValue ? 630 USB_STATE_CONFIGURED : USB_STATE_ADDRESS); 631 632 /* 633 * SET_CONFIGURATION (and SET_INTERFACE) must reset the halt 634 * feature on all endpoints. There is however no need to do so 635 * explicitly here as the gadget driver will disable and 636 * reenable endpoints, clearing the halt feature. 637 */ 638 return false; 639 640 default: 641 return udc->driver->setup(&udc->gadget, req) < 0; 642 } 643 } 644 645 static void isp1760_ep0_setup(struct isp1760_udc *udc) 646 { 647 union { 648 struct usb_ctrlrequest r; 649 u32 data[2]; 650 } req; 651 unsigned int count; 652 bool stall = false; 653 654 spin_lock(&udc->lock); 655 656 isp1760_udc_write(udc, DC_EPINDEX, DC_EP0SETUP); 657 658 count = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; 659 if (count != sizeof(req)) { 660 spin_unlock(&udc->lock); 661 662 dev_err(udc->isp->dev, "invalid length %u for setup packet\n", 663 count); 664 665 isp1760_udc_ctrl_send_stall(&udc->ep[0]); 666 return; 667 } 668 669 req.data[0] = isp1760_udc_read(udc, DC_DATAPORT); 670 req.data[1] = isp1760_udc_read(udc, DC_DATAPORT); 671 672 if (udc->ep0_state != ISP1760_CTRL_SETUP) { 673 spin_unlock(&udc->lock); 674 dev_dbg(udc->isp->dev, "unexpected SETUP packet\n"); 675 return; 676 } 677 678 /* Move to the data stage. */ 679 if (!req.r.wLength) 680 udc->ep0_state = ISP1760_CTRL_STATUS; 681 else if (req.r.bRequestType & USB_DIR_IN) 682 udc->ep0_state = ISP1760_CTRL_DATA_IN; 683 else 684 udc->ep0_state = ISP1760_CTRL_DATA_OUT; 685 686 udc->ep0_dir = req.r.bRequestType & USB_DIR_IN; 687 udc->ep0_length = le16_to_cpu(req.r.wLength); 688 689 spin_unlock(&udc->lock); 690 691 dev_dbg(udc->isp->dev, 692 "%s: bRequestType 0x%02x bRequest 0x%02x wValue 0x%04x wIndex 0x%04x wLength 0x%04x\n", 693 __func__, req.r.bRequestType, req.r.bRequest, 694 le16_to_cpu(req.r.wValue), le16_to_cpu(req.r.wIndex), 695 le16_to_cpu(req.r.wLength)); 696 697 if ((req.r.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) 698 stall = isp1760_ep0_setup_standard(udc, &req.r); 699 else 700 stall = udc->driver->setup(&udc->gadget, &req.r) < 0; 701 702 if (stall) 703 isp1760_udc_ctrl_send_stall(&udc->ep[0]); 704 } 705 706 /* ----------------------------------------------------------------------------- 707 * Gadget Endpoint Operations 708 */ 709 710 static int isp1760_ep_enable(struct usb_ep *ep, 711 const struct usb_endpoint_descriptor *desc) 712 { 713 struct isp1760_ep *uep = ep_to_udc_ep(ep); 714 struct isp1760_udc *udc = uep->udc; 715 unsigned long flags; 716 unsigned int type; 717 718 dev_dbg(uep->udc->isp->dev, "%s\n", __func__); 719 720 /* 721 * Validate the descriptor. The control endpoint can't be enabled 722 * manually. 723 */ 724 if (desc->bDescriptorType != USB_DT_ENDPOINT || 725 desc->bEndpointAddress == 0 || 726 desc->bEndpointAddress != uep->addr || 727 le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket) { 728 dev_dbg(udc->isp->dev, 729 "%s: invalid descriptor type %u addr %02x ep addr %02x max packet size %u/%u\n", 730 __func__, desc->bDescriptorType, 731 desc->bEndpointAddress, uep->addr, 732 le16_to_cpu(desc->wMaxPacketSize), ep->maxpacket); 733 return -EINVAL; 734 } 735 736 switch (usb_endpoint_type(desc)) { 737 case USB_ENDPOINT_XFER_ISOC: 738 type = DC_ENDPTYP_ISOC; 739 break; 740 case USB_ENDPOINT_XFER_BULK: 741 type = DC_ENDPTYP_BULK; 742 break; 743 case USB_ENDPOINT_XFER_INT: 744 type = DC_ENDPTYP_INTERRUPT; 745 break; 746 case USB_ENDPOINT_XFER_CONTROL: 747 default: 748 dev_dbg(udc->isp->dev, "%s: control endpoints unsupported\n", 749 __func__); 750 return -EINVAL; 751 } 752 753 spin_lock_irqsave(&udc->lock, flags); 754 755 uep->desc = desc; 756 uep->maxpacket = le16_to_cpu(desc->wMaxPacketSize); 757 uep->rx_pending = false; 758 uep->halted = false; 759 uep->wedged = false; 760 761 isp1760_udc_select_ep(uep); 762 isp1760_udc_write(udc, DC_EPMAXPKTSZ, uep->maxpacket); 763 isp1760_udc_write(udc, DC_BUFLEN, uep->maxpacket); 764 isp1760_udc_write(udc, DC_EPTYPE, DC_EPENABLE | type); 765 766 spin_unlock_irqrestore(&udc->lock, flags); 767 768 return 0; 769 } 770 771 static int isp1760_ep_disable(struct usb_ep *ep) 772 { 773 struct isp1760_ep *uep = ep_to_udc_ep(ep); 774 struct isp1760_udc *udc = uep->udc; 775 struct isp1760_request *req, *nreq; 776 LIST_HEAD(req_list); 777 unsigned long flags; 778 779 dev_dbg(udc->isp->dev, "%s\n", __func__); 780 781 spin_lock_irqsave(&udc->lock, flags); 782 783 if (!uep->desc) { 784 dev_dbg(udc->isp->dev, "%s: endpoint not enabled\n", __func__); 785 spin_unlock_irqrestore(&udc->lock, flags); 786 return -EINVAL; 787 } 788 789 uep->desc = NULL; 790 uep->maxpacket = 0; 791 792 isp1760_udc_select_ep(uep); 793 isp1760_udc_write(udc, DC_EPTYPE, 0); 794 795 /* TODO Synchronize with the IRQ handler */ 796 797 list_splice_init(&uep->queue, &req_list); 798 799 spin_unlock_irqrestore(&udc->lock, flags); 800 801 list_for_each_entry_safe(req, nreq, &req_list, queue) { 802 list_del(&req->queue); 803 isp1760_udc_request_complete(uep, req, -ESHUTDOWN); 804 } 805 806 return 0; 807 } 808 809 static struct usb_request *isp1760_ep_alloc_request(struct usb_ep *ep, 810 gfp_t gfp_flags) 811 { 812 struct isp1760_request *req; 813 814 req = kzalloc(sizeof(*req), gfp_flags); 815 if (!req) 816 return NULL; 817 818 return &req->req; 819 } 820 821 static void isp1760_ep_free_request(struct usb_ep *ep, struct usb_request *_req) 822 { 823 struct isp1760_request *req = req_to_udc_req(_req); 824 825 kfree(req); 826 } 827 828 static int isp1760_ep_queue(struct usb_ep *ep, struct usb_request *_req, 829 gfp_t gfp_flags) 830 { 831 struct isp1760_request *req = req_to_udc_req(_req); 832 struct isp1760_ep *uep = ep_to_udc_ep(ep); 833 struct isp1760_udc *udc = uep->udc; 834 bool complete = false; 835 unsigned long flags; 836 int ret = 0; 837 838 _req->status = -EINPROGRESS; 839 _req->actual = 0; 840 841 spin_lock_irqsave(&udc->lock, flags); 842 843 dev_dbg(udc->isp->dev, 844 "%s: req %p (%u bytes%s) ep %p(0x%02x)\n", __func__, _req, 845 _req->length, _req->zero ? " (zlp)" : "", uep, uep->addr); 846 847 req->ep = uep; 848 849 if (uep->addr == 0) { 850 if (_req->length != udc->ep0_length && 851 udc->ep0_state != ISP1760_CTRL_DATA_IN) { 852 dev_dbg(udc->isp->dev, 853 "%s: invalid length %u for req %p\n", 854 __func__, _req->length, req); 855 ret = -EINVAL; 856 goto done; 857 } 858 859 switch (udc->ep0_state) { 860 case ISP1760_CTRL_DATA_IN: 861 dev_dbg(udc->isp->dev, "%s: transmitting req %p\n", 862 __func__, req); 863 864 list_add_tail(&req->queue, &uep->queue); 865 isp1760_udc_transmit(uep, req); 866 break; 867 868 case ISP1760_CTRL_DATA_OUT: 869 list_add_tail(&req->queue, &uep->queue); 870 __isp1760_udc_select_ep(uep, USB_DIR_OUT); 871 isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); 872 break; 873 874 case ISP1760_CTRL_STATUS: 875 complete = true; 876 break; 877 878 default: 879 dev_dbg(udc->isp->dev, "%s: invalid ep0 state\n", 880 __func__); 881 ret = -EINVAL; 882 break; 883 } 884 } else if (uep->desc) { 885 bool empty = list_empty(&uep->queue); 886 887 list_add_tail(&req->queue, &uep->queue); 888 if ((uep->addr & USB_DIR_IN) && !uep->halted && empty) 889 isp1760_udc_transmit(uep, req); 890 else if (!(uep->addr & USB_DIR_IN) && uep->rx_pending) 891 complete = isp1760_udc_receive(uep, req); 892 } else { 893 dev_dbg(udc->isp->dev, 894 "%s: can't queue request to disabled ep%02x\n", 895 __func__, uep->addr); 896 ret = -ESHUTDOWN; 897 } 898 899 done: 900 if (ret < 0) 901 req->ep = NULL; 902 903 spin_unlock_irqrestore(&udc->lock, flags); 904 905 if (complete) 906 isp1760_udc_request_complete(uep, req, 0); 907 908 return ret; 909 } 910 911 static int isp1760_ep_dequeue(struct usb_ep *ep, struct usb_request *_req) 912 { 913 struct isp1760_request *req = req_to_udc_req(_req); 914 struct isp1760_ep *uep = ep_to_udc_ep(ep); 915 struct isp1760_udc *udc = uep->udc; 916 unsigned long flags; 917 918 dev_dbg(uep->udc->isp->dev, "%s(ep%02x)\n", __func__, uep->addr); 919 920 spin_lock_irqsave(&udc->lock, flags); 921 922 if (req->ep != uep) 923 req = NULL; 924 else 925 list_del(&req->queue); 926 927 spin_unlock_irqrestore(&udc->lock, flags); 928 929 if (!req) 930 return -EINVAL; 931 932 isp1760_udc_request_complete(uep, req, -ECONNRESET); 933 return 0; 934 } 935 936 static int __isp1760_ep_set_halt(struct isp1760_ep *uep, bool stall, bool wedge) 937 { 938 struct isp1760_udc *udc = uep->udc; 939 int ret; 940 941 if (!uep->addr) { 942 /* 943 * Halting the control endpoint is only valid as a delayed error 944 * response to a SETUP packet. Make sure EP0 is in the right 945 * stage and that the gadget isn't trying to clear the halt 946 * condition. 947 */ 948 if (WARN_ON(udc->ep0_state == ISP1760_CTRL_SETUP || !stall || 949 wedge)) { 950 return -EINVAL; 951 } 952 } 953 954 if (uep->addr && !uep->desc) { 955 dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, 956 uep->addr); 957 return -EINVAL; 958 } 959 960 if (uep->addr & USB_DIR_IN) { 961 /* Refuse to halt IN endpoints with active transfers. */ 962 if (!list_empty(&uep->queue)) { 963 dev_dbg(udc->isp->dev, 964 "%s: ep%02x has request pending\n", __func__, 965 uep->addr); 966 return -EAGAIN; 967 } 968 } 969 970 ret = __isp1760_udc_set_halt(uep, stall); 971 if (ret < 0) 972 return ret; 973 974 if (!uep->addr) { 975 /* 976 * Stalling EP0 completes the control transaction, move back to 977 * the SETUP state. 978 */ 979 udc->ep0_state = ISP1760_CTRL_SETUP; 980 return 0; 981 } 982 983 if (wedge) 984 uep->wedged = true; 985 else if (!stall) 986 uep->wedged = false; 987 988 return 0; 989 } 990 991 static int isp1760_ep_set_halt(struct usb_ep *ep, int value) 992 { 993 struct isp1760_ep *uep = ep_to_udc_ep(ep); 994 unsigned long flags; 995 int ret; 996 997 dev_dbg(uep->udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, 998 value ? "set" : "clear", uep->addr); 999 1000 spin_lock_irqsave(&uep->udc->lock, flags); 1001 ret = __isp1760_ep_set_halt(uep, value, false); 1002 spin_unlock_irqrestore(&uep->udc->lock, flags); 1003 1004 return ret; 1005 } 1006 1007 static int isp1760_ep_set_wedge(struct usb_ep *ep) 1008 { 1009 struct isp1760_ep *uep = ep_to_udc_ep(ep); 1010 unsigned long flags; 1011 int ret; 1012 1013 dev_dbg(uep->udc->isp->dev, "%s: set wedge on ep%02x)\n", __func__, 1014 uep->addr); 1015 1016 spin_lock_irqsave(&uep->udc->lock, flags); 1017 ret = __isp1760_ep_set_halt(uep, true, true); 1018 spin_unlock_irqrestore(&uep->udc->lock, flags); 1019 1020 return ret; 1021 } 1022 1023 static void isp1760_ep_fifo_flush(struct usb_ep *ep) 1024 { 1025 struct isp1760_ep *uep = ep_to_udc_ep(ep); 1026 struct isp1760_udc *udc = uep->udc; 1027 unsigned long flags; 1028 1029 spin_lock_irqsave(&udc->lock, flags); 1030 1031 isp1760_udc_select_ep(uep); 1032 1033 /* 1034 * Set the CLBUF bit twice to flush both buffers in case double 1035 * buffering is enabled. 1036 */ 1037 isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); 1038 isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); 1039 1040 spin_unlock_irqrestore(&udc->lock, flags); 1041 } 1042 1043 static const struct usb_ep_ops isp1760_ep_ops = { 1044 .enable = isp1760_ep_enable, 1045 .disable = isp1760_ep_disable, 1046 .alloc_request = isp1760_ep_alloc_request, 1047 .free_request = isp1760_ep_free_request, 1048 .queue = isp1760_ep_queue, 1049 .dequeue = isp1760_ep_dequeue, 1050 .set_halt = isp1760_ep_set_halt, 1051 .set_wedge = isp1760_ep_set_wedge, 1052 .fifo_flush = isp1760_ep_fifo_flush, 1053 }; 1054 1055 /* ----------------------------------------------------------------------------- 1056 * Device States 1057 */ 1058 1059 /* Called with the UDC spinlock held. */ 1060 static void isp1760_udc_connect(struct isp1760_udc *udc) 1061 { 1062 usb_gadget_set_state(&udc->gadget, USB_STATE_POWERED); 1063 mod_timer(&udc->vbus_timer, jiffies + ISP1760_VBUS_POLL_INTERVAL); 1064 } 1065 1066 /* Called with the UDC spinlock held. */ 1067 static void isp1760_udc_disconnect(struct isp1760_udc *udc) 1068 { 1069 if (udc->gadget.state < USB_STATE_POWERED) 1070 return; 1071 1072 dev_dbg(udc->isp->dev, "Device disconnected in state %u\n", 1073 udc->gadget.state); 1074 1075 udc->gadget.speed = USB_SPEED_UNKNOWN; 1076 usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); 1077 1078 if (udc->driver->disconnect) 1079 udc->driver->disconnect(&udc->gadget); 1080 1081 del_timer(&udc->vbus_timer); 1082 1083 /* TODO Reset all endpoints ? */ 1084 } 1085 1086 static void isp1760_udc_init_hw(struct isp1760_udc *udc) 1087 { 1088 /* 1089 * The device controller currently shares its interrupt with the host 1090 * controller, the DC_IRQ polarity and signaling mode are ignored. Set 1091 * the to active-low level-triggered. 1092 * 1093 * Configure the control, in and out pipes to generate interrupts on 1094 * ACK tokens only (and NYET for the out pipe). The default 1095 * configuration also generates an interrupt on the first NACK token. 1096 */ 1097 isp1760_udc_write(udc, DC_INTCONF, DC_CDBGMOD_ACK | DC_DDBGMODIN_ACK | 1098 DC_DDBGMODOUT_ACK_NYET); 1099 1100 isp1760_udc_write(udc, DC_INTENABLE, DC_IEPRXTX(7) | DC_IEPRXTX(6) | 1101 DC_IEPRXTX(5) | DC_IEPRXTX(4) | DC_IEPRXTX(3) | 1102 DC_IEPRXTX(2) | DC_IEPRXTX(1) | DC_IEPRXTX(0) | 1103 DC_IEP0SETUP | DC_IEVBUS | DC_IERESM | DC_IESUSP | 1104 DC_IEHS_STA | DC_IEBRST); 1105 1106 if (udc->connected) 1107 isp1760_set_pullup(udc->isp, true); 1108 1109 isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN); 1110 } 1111 1112 static void isp1760_udc_reset(struct isp1760_udc *udc) 1113 { 1114 unsigned long flags; 1115 1116 spin_lock_irqsave(&udc->lock, flags); 1117 1118 /* 1119 * The bus reset has reset most registers to their default value, 1120 * reinitialize the UDC hardware. 1121 */ 1122 isp1760_udc_init_hw(udc); 1123 1124 udc->ep0_state = ISP1760_CTRL_SETUP; 1125 udc->gadget.speed = USB_SPEED_FULL; 1126 1127 usb_gadget_udc_reset(&udc->gadget, udc->driver); 1128 1129 spin_unlock_irqrestore(&udc->lock, flags); 1130 } 1131 1132 static void isp1760_udc_suspend(struct isp1760_udc *udc) 1133 { 1134 if (udc->gadget.state < USB_STATE_DEFAULT) 1135 return; 1136 1137 if (udc->driver->suspend) 1138 udc->driver->suspend(&udc->gadget); 1139 } 1140 1141 static void isp1760_udc_resume(struct isp1760_udc *udc) 1142 { 1143 if (udc->gadget.state < USB_STATE_DEFAULT) 1144 return; 1145 1146 if (udc->driver->resume) 1147 udc->driver->resume(&udc->gadget); 1148 } 1149 1150 /* ----------------------------------------------------------------------------- 1151 * Gadget Operations 1152 */ 1153 1154 static int isp1760_udc_get_frame(struct usb_gadget *gadget) 1155 { 1156 struct isp1760_udc *udc = gadget_to_udc(gadget); 1157 1158 return isp1760_udc_read(udc, DC_FRAMENUM) & ((1 << 11) - 1); 1159 } 1160 1161 static int isp1760_udc_wakeup(struct usb_gadget *gadget) 1162 { 1163 struct isp1760_udc *udc = gadget_to_udc(gadget); 1164 1165 dev_dbg(udc->isp->dev, "%s\n", __func__); 1166 return -ENOTSUPP; 1167 } 1168 1169 static int isp1760_udc_set_selfpowered(struct usb_gadget *gadget, 1170 int is_selfpowered) 1171 { 1172 struct isp1760_udc *udc = gadget_to_udc(gadget); 1173 1174 if (is_selfpowered) 1175 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED; 1176 else 1177 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 1178 1179 return 0; 1180 } 1181 1182 static int isp1760_udc_pullup(struct usb_gadget *gadget, int is_on) 1183 { 1184 struct isp1760_udc *udc = gadget_to_udc(gadget); 1185 1186 isp1760_set_pullup(udc->isp, is_on); 1187 udc->connected = is_on; 1188 1189 return 0; 1190 } 1191 1192 static int isp1760_udc_start(struct usb_gadget *gadget, 1193 struct usb_gadget_driver *driver) 1194 { 1195 struct isp1760_udc *udc = gadget_to_udc(gadget); 1196 unsigned long flags; 1197 1198 /* The hardware doesn't support low speed. */ 1199 if (driver->max_speed < USB_SPEED_FULL) { 1200 dev_err(udc->isp->dev, "Invalid gadget driver\n"); 1201 return -EINVAL; 1202 } 1203 1204 spin_lock_irqsave(&udc->lock, flags); 1205 1206 if (udc->driver) { 1207 dev_err(udc->isp->dev, "UDC already has a gadget driver\n"); 1208 spin_unlock_irqrestore(&udc->lock, flags); 1209 return -EBUSY; 1210 } 1211 1212 udc->driver = driver; 1213 1214 spin_unlock_irqrestore(&udc->lock, flags); 1215 1216 dev_dbg(udc->isp->dev, "starting UDC with driver %s\n", 1217 driver->function); 1218 1219 udc->devstatus = 0; 1220 udc->connected = true; 1221 1222 usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); 1223 1224 /* DMA isn't supported yet, don't enable the DMA clock. */ 1225 isp1760_udc_write(udc, DC_MODE, DC_GLINTENA); 1226 1227 isp1760_udc_init_hw(udc); 1228 1229 dev_dbg(udc->isp->dev, "UDC started with driver %s\n", 1230 driver->function); 1231 1232 return 0; 1233 } 1234 1235 static int isp1760_udc_stop(struct usb_gadget *gadget) 1236 { 1237 struct isp1760_udc *udc = gadget_to_udc(gadget); 1238 unsigned long flags; 1239 1240 dev_dbg(udc->isp->dev, "%s\n", __func__); 1241 1242 del_timer_sync(&udc->vbus_timer); 1243 1244 isp1760_udc_write(udc, DC_MODE, 0); 1245 1246 spin_lock_irqsave(&udc->lock, flags); 1247 udc->driver = NULL; 1248 spin_unlock_irqrestore(&udc->lock, flags); 1249 1250 return 0; 1251 } 1252 1253 static struct usb_gadget_ops isp1760_udc_ops = { 1254 .get_frame = isp1760_udc_get_frame, 1255 .wakeup = isp1760_udc_wakeup, 1256 .set_selfpowered = isp1760_udc_set_selfpowered, 1257 .pullup = isp1760_udc_pullup, 1258 .udc_start = isp1760_udc_start, 1259 .udc_stop = isp1760_udc_stop, 1260 }; 1261 1262 /* ----------------------------------------------------------------------------- 1263 * Interrupt Handling 1264 */ 1265 1266 static irqreturn_t isp1760_udc_irq(int irq, void *dev) 1267 { 1268 struct isp1760_udc *udc = dev; 1269 unsigned int i; 1270 u32 status; 1271 1272 status = isp1760_udc_read(udc, DC_INTERRUPT) 1273 & isp1760_udc_read(udc, DC_INTENABLE); 1274 isp1760_udc_write(udc, DC_INTERRUPT, status); 1275 1276 if (status & DC_IEVBUS) { 1277 dev_dbg(udc->isp->dev, "%s(VBUS)\n", __func__); 1278 /* The VBUS interrupt is only triggered when VBUS appears. */ 1279 spin_lock(&udc->lock); 1280 isp1760_udc_connect(udc); 1281 spin_unlock(&udc->lock); 1282 } 1283 1284 if (status & DC_IEBRST) { 1285 dev_dbg(udc->isp->dev, "%s(BRST)\n", __func__); 1286 1287 isp1760_udc_reset(udc); 1288 } 1289 1290 for (i = 0; i <= 7; ++i) { 1291 struct isp1760_ep *ep = &udc->ep[i*2]; 1292 1293 if (status & DC_IEPTX(i)) { 1294 dev_dbg(udc->isp->dev, "%s(EPTX%u)\n", __func__, i); 1295 isp1760_ep_tx_complete(ep); 1296 } 1297 1298 if (status & DC_IEPRX(i)) { 1299 dev_dbg(udc->isp->dev, "%s(EPRX%u)\n", __func__, i); 1300 isp1760_ep_rx_ready(i ? ep - 1 : ep); 1301 } 1302 } 1303 1304 if (status & DC_IEP0SETUP) { 1305 dev_dbg(udc->isp->dev, "%s(EP0SETUP)\n", __func__); 1306 1307 isp1760_ep0_setup(udc); 1308 } 1309 1310 if (status & DC_IERESM) { 1311 dev_dbg(udc->isp->dev, "%s(RESM)\n", __func__); 1312 isp1760_udc_resume(udc); 1313 } 1314 1315 if (status & DC_IESUSP) { 1316 dev_dbg(udc->isp->dev, "%s(SUSP)\n", __func__); 1317 1318 spin_lock(&udc->lock); 1319 if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) 1320 isp1760_udc_disconnect(udc); 1321 else 1322 isp1760_udc_suspend(udc); 1323 spin_unlock(&udc->lock); 1324 } 1325 1326 if (status & DC_IEHS_STA) { 1327 dev_dbg(udc->isp->dev, "%s(HS_STA)\n", __func__); 1328 udc->gadget.speed = USB_SPEED_HIGH; 1329 } 1330 1331 return status ? IRQ_HANDLED : IRQ_NONE; 1332 } 1333 1334 static void isp1760_udc_vbus_poll(unsigned long data) 1335 { 1336 struct isp1760_udc *udc = (struct isp1760_udc *)data; 1337 unsigned long flags; 1338 1339 spin_lock_irqsave(&udc->lock, flags); 1340 1341 if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) 1342 isp1760_udc_disconnect(udc); 1343 else if (udc->gadget.state >= USB_STATE_POWERED) 1344 mod_timer(&udc->vbus_timer, 1345 jiffies + ISP1760_VBUS_POLL_INTERVAL); 1346 1347 spin_unlock_irqrestore(&udc->lock, flags); 1348 } 1349 1350 /* ----------------------------------------------------------------------------- 1351 * Registration 1352 */ 1353 1354 static void isp1760_udc_init_eps(struct isp1760_udc *udc) 1355 { 1356 unsigned int i; 1357 1358 INIT_LIST_HEAD(&udc->gadget.ep_list); 1359 1360 for (i = 0; i < ARRAY_SIZE(udc->ep); ++i) { 1361 struct isp1760_ep *ep = &udc->ep[i]; 1362 unsigned int ep_num = (i + 1) / 2; 1363 bool is_in = !(i & 1); 1364 1365 ep->udc = udc; 1366 1367 INIT_LIST_HEAD(&ep->queue); 1368 1369 ep->addr = (ep_num && is_in ? USB_DIR_IN : USB_DIR_OUT) 1370 | ep_num; 1371 ep->desc = NULL; 1372 1373 sprintf(ep->name, "ep%u%s", ep_num, 1374 ep_num ? (is_in ? "in" : "out") : ""); 1375 1376 ep->ep.ops = &isp1760_ep_ops; 1377 ep->ep.name = ep->name; 1378 1379 /* 1380 * Hardcode the maximum packet sizes for now, to 64 bytes for 1381 * the control endpoint and 512 bytes for all other endpoints. 1382 * This fits in the 8kB FIFO without double-buffering. 1383 */ 1384 if (ep_num == 0) { 1385 ep->ep.maxpacket = 64; 1386 ep->maxpacket = 64; 1387 udc->gadget.ep0 = &ep->ep; 1388 } else { 1389 ep->ep.maxpacket = 512; 1390 ep->maxpacket = 0; 1391 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 1392 } 1393 } 1394 } 1395 1396 static int isp1760_udc_init(struct isp1760_udc *udc) 1397 { 1398 u16 scratch; 1399 u32 chipid; 1400 1401 /* 1402 * Check that the controller is present by writing to the scratch 1403 * register, modifying the bus pattern by reading from the chip ID 1404 * register, and reading the scratch register value back. The chip ID 1405 * and scratch register contents must match the expected values. 1406 */ 1407 isp1760_udc_write(udc, DC_SCRATCH, 0xbabe); 1408 chipid = isp1760_udc_read(udc, DC_CHIPID); 1409 scratch = isp1760_udc_read(udc, DC_SCRATCH); 1410 1411 if (scratch != 0xbabe) { 1412 dev_err(udc->isp->dev, 1413 "udc: scratch test failed (0x%04x/0x%08x)\n", 1414 scratch, chipid); 1415 return -ENODEV; 1416 } 1417 1418 if (chipid != 0x00011582 && chipid != 0x00158210) { 1419 dev_err(udc->isp->dev, "udc: invalid chip ID 0x%08x\n", chipid); 1420 return -ENODEV; 1421 } 1422 1423 /* Reset the device controller. */ 1424 isp1760_udc_write(udc, DC_MODE, DC_SFRESET); 1425 usleep_range(10000, 11000); 1426 isp1760_udc_write(udc, DC_MODE, 0); 1427 usleep_range(10000, 11000); 1428 1429 return 0; 1430 } 1431 1432 int isp1760_udc_register(struct isp1760_device *isp, int irq, 1433 unsigned long irqflags) 1434 { 1435 struct isp1760_udc *udc = &isp->udc; 1436 const char *devname; 1437 int ret; 1438 1439 udc->irq = -1; 1440 udc->isp = isp; 1441 udc->regs = isp->regs; 1442 1443 spin_lock_init(&udc->lock); 1444 setup_timer(&udc->vbus_timer, isp1760_udc_vbus_poll, 1445 (unsigned long)udc); 1446 1447 ret = isp1760_udc_init(udc); 1448 if (ret < 0) 1449 return ret; 1450 1451 devname = dev_name(isp->dev); 1452 udc->irqname = kmalloc(strlen(devname) + 7, GFP_KERNEL); 1453 if (!udc->irqname) 1454 return -ENOMEM; 1455 1456 sprintf(udc->irqname, "%s (udc)", devname); 1457 1458 ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags, 1459 udc->irqname, udc); 1460 if (ret < 0) 1461 goto error; 1462 1463 udc->irq = irq; 1464 1465 /* 1466 * Initialize the gadget static fields and register its device. Gadget 1467 * fields that vary during the life time of the gadget are initialized 1468 * by the UDC core. 1469 */ 1470 udc->gadget.ops = &isp1760_udc_ops; 1471 udc->gadget.speed = USB_SPEED_UNKNOWN; 1472 udc->gadget.max_speed = USB_SPEED_HIGH; 1473 udc->gadget.name = "isp1761_udc"; 1474 1475 isp1760_udc_init_eps(udc); 1476 1477 ret = usb_add_gadget_udc(isp->dev, &udc->gadget); 1478 if (ret < 0) 1479 goto error; 1480 1481 return 0; 1482 1483 error: 1484 if (udc->irq >= 0) 1485 free_irq(udc->irq, udc); 1486 kfree(udc->irqname); 1487 1488 return ret; 1489 } 1490 1491 void isp1760_udc_unregister(struct isp1760_device *isp) 1492 { 1493 struct isp1760_udc *udc = &isp->udc; 1494 1495 if (!udc->isp) 1496 return; 1497 1498 usb_del_gadget_udc(&udc->gadget); 1499 1500 free_irq(udc->irq, udc); 1501 kfree(udc->irqname); 1502 } 1503