1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * from linux: 4 * c94e289f195e: usb: gadget: remove incorrect __init/__exit annotations 5 * 6 * at91_udc -- driver for at91-series USB peripheral controller 7 * 8 * Copyright (C) 2004 by Thomas Rathbone 9 * Copyright (C) 2005 by HP Labs 10 * Copyright (C) 2005 by David Brownell 11 */ 12 13 #undef VERBOSE_DEBUG 14 #undef PACKET_TRACE 15 16 #include <common.h> 17 #include <linux/errno.h> 18 #include <asm/io.h> 19 #include <asm/gpio.h> 20 #include <asm/hardware.h> 21 #include <mach/at91_matrix.h> 22 #include <linux/list.h> 23 #include <linux/usb/ch9.h> 24 #include <linux/usb/gadget.h> 25 #include <linux/usb/at91_udc.h> 26 #include <malloc.h> 27 #include <usb/lin_gadget_compat.h> 28 29 #include "at91_udc.h" 30 31 /* 32 * This controller is simple and PIO-only. It's used in many AT91-series 33 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), 34 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. 35 * 36 * This driver expects the board has been wired with two GPIOs supporting 37 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the 38 * testing hasn't covered such cases.) 39 * 40 * The pullup is most important (so it's integrated on sam926x parts). It 41 * provides software control over whether the host enumerates the device. 42 * 43 * The VBUS sensing helps during enumeration, and allows both USB clocks 44 * (and the transceiver) to stay gated off until they're necessary, saving 45 * power. During USB suspend, the 48 MHz clock is gated off in hardware; 46 * it may also be gated off by software during some Linux sleep states. 47 */ 48 49 #define DRIVER_VERSION "3 May 2006" 50 51 static const char driver_name [] = "at91_udc"; 52 static const char * const ep_names[] = { 53 "ep0", 54 "ep1", 55 "ep2", 56 "ep3-int", 57 "ep4", 58 "ep5", 59 }; 60 #define ep0name ep_names[0] 61 62 #define at91_udp_read(udc, reg) \ 63 __raw_readl((udc)->udp_baseaddr + (reg)) 64 #define at91_udp_write(udc, reg, val) \ 65 __raw_writel((val), (udc)->udp_baseaddr + (reg)) 66 67 static struct at91_udc *controller; 68 69 /*-------------------------------------------------------------------------*/ 70 71 static void done(struct at91_ep *ep, struct at91_request *req, int status) 72 { 73 unsigned stopped = ep->stopped; 74 struct at91_udc *udc = ep->udc; 75 76 list_del_init(&req->queue); 77 if (req->req.status == -EINPROGRESS) 78 req->req.status = status; 79 else 80 status = req->req.status; 81 if (status && status != -ESHUTDOWN) 82 VDBG("%s done %p, status %d\n", ep->ep.name, req, status); 83 84 ep->stopped = 1; 85 spin_unlock(&udc->lock); 86 req->req.complete(&ep->ep, &req->req); 87 spin_lock(&udc->lock); 88 ep->stopped = stopped; 89 90 /* ep0 is always ready; other endpoints need a non-empty queue */ 91 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) 92 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask); 93 } 94 95 /*-------------------------------------------------------------------------*/ 96 97 /* bits indicating OUT fifo has data ready */ 98 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) 99 100 /* 101 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write 102 * back most of the value you just read (because of side effects, including 103 * bits that may change after reading and before writing). 104 * 105 * Except when changing a specific bit, always write values which: 106 * - clear SET_FX bits (setting them could change something) 107 * - set CLR_FX bits (clearing them could change something) 108 * 109 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE 110 * that shouldn't normally be changed. 111 * 112 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, 113 * implying a need to wait for one write to complete (test relevant bits) 114 * before starting the next write. This shouldn't be an issue given how 115 * infrequently we write, except maybe for write-then-read idioms. 116 */ 117 #define SET_FX (AT91_UDP_TXPKTRDY) 118 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ 119 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) 120 121 /* pull OUT packet data from the endpoint's fifo */ 122 static int read_fifo (struct at91_ep *ep, struct at91_request *req) 123 { 124 u32 __iomem *creg = ep->creg; 125 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 126 u32 csr; 127 u8 *buf; 128 unsigned int count, bufferspace, is_done; 129 130 buf = req->req.buf + req->req.actual; 131 bufferspace = req->req.length - req->req.actual; 132 133 /* 134 * there might be nothing to read if ep_queue() calls us, 135 * or if we already emptied both pingpong buffers 136 */ 137 rescan: 138 csr = __raw_readl(creg); 139 if ((csr & RX_DATA_READY) == 0) 140 return 0; 141 142 count = (csr & AT91_UDP_RXBYTECNT) >> 16; 143 if (count > ep->ep.maxpacket) 144 count = ep->ep.maxpacket; 145 if (count > bufferspace) { 146 DBG("%s buffer overflow\n", ep->ep.name); 147 req->req.status = -EOVERFLOW; 148 count = bufferspace; 149 } 150 __raw_readsb((unsigned long)dreg, buf, count); 151 152 /* release and swap pingpong mem bank */ 153 csr |= CLR_FX; 154 if (ep->is_pingpong) { 155 if (ep->fifo_bank == 0) { 156 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 157 ep->fifo_bank = 1; 158 } else { 159 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); 160 ep->fifo_bank = 0; 161 } 162 } else 163 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 164 __raw_writel(csr, creg); 165 166 req->req.actual += count; 167 is_done = (count < ep->ep.maxpacket); 168 if (count == bufferspace) 169 is_done = 1; 170 171 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, 172 is_done ? " (done)" : ""); 173 174 /* 175 * avoid extra trips through IRQ logic for packets already in 176 * the fifo ... maybe preventing an extra (expensive) OUT-NAK 177 */ 178 if (is_done) 179 done(ep, req, 0); 180 else if (ep->is_pingpong) { 181 /* 182 * One dummy read to delay the code because of a HW glitch: 183 * CSR returns bad RXCOUNT when read too soon after updating 184 * RX_DATA_BK flags. 185 */ 186 csr = __raw_readl(creg); 187 188 bufferspace -= count; 189 buf += count; 190 goto rescan; 191 } 192 193 return is_done; 194 } 195 196 /* load fifo for an IN packet */ 197 static int write_fifo(struct at91_ep *ep, struct at91_request *req) 198 { 199 u32 __iomem *creg = ep->creg; 200 u32 csr = __raw_readl(creg); 201 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 202 unsigned total, count, is_last; 203 u8 *buf; 204 205 /* 206 * TODO: allow for writing two packets to the fifo ... that'll 207 * reduce the amount of IN-NAKing, but probably won't affect 208 * throughput much. (Unlike preventing OUT-NAKing!) 209 */ 210 211 /* 212 * If ep_queue() calls us, the queue is empty and possibly in 213 * odd states like TXCOMP not yet cleared (we do it, saving at 214 * least one IRQ) or the fifo not yet being free. Those aren't 215 * issues normally (IRQ handler fast path). 216 */ 217 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { 218 if (csr & AT91_UDP_TXCOMP) { 219 csr |= CLR_FX; 220 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 221 __raw_writel(csr, creg); 222 csr = __raw_readl(creg); 223 } 224 if (csr & AT91_UDP_TXPKTRDY) 225 return 0; 226 } 227 228 buf = req->req.buf + req->req.actual; 229 prefetch(buf); 230 total = req->req.length - req->req.actual; 231 if (ep->ep.maxpacket < total) { 232 count = ep->ep.maxpacket; 233 is_last = 0; 234 } else { 235 count = total; 236 is_last = (count < ep->ep.maxpacket) || !req->req.zero; 237 } 238 239 /* 240 * Write the packet, maybe it's a ZLP. 241 * 242 * NOTE: incrementing req->actual before we receive the ACK means 243 * gadget driver IN bytecounts can be wrong in fault cases. That's 244 * fixable with PIO drivers like this one (save "count" here, and 245 * do the increment later on TX irq), but not for most DMA hardware. 246 * 247 * So all gadget drivers must accept that potential error. Some 248 * hardware supports precise fifo status reporting, letting them 249 * recover when the actual bytecount matters (e.g. for USB Test 250 * and Measurement Class devices). 251 */ 252 __raw_writesb((unsigned long)dreg, buf, count); 253 csr &= ~SET_FX; 254 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 255 __raw_writel(csr, creg); 256 req->req.actual += count; 257 258 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, 259 is_last ? " (done)" : ""); 260 if (is_last) 261 done(ep, req, 0); 262 return is_last; 263 } 264 265 static void nuke(struct at91_ep *ep, int status) 266 { 267 struct at91_request *req; 268 269 /* terminate any request in the queue */ 270 ep->stopped = 1; 271 if (list_empty(&ep->queue)) 272 return; 273 274 VDBG("%s %s\n", __func__, ep->ep.name); 275 while (!list_empty(&ep->queue)) { 276 req = list_entry(ep->queue.next, struct at91_request, queue); 277 done(ep, req, status); 278 } 279 } 280 281 /*-------------------------------------------------------------------------*/ 282 283 static int at91_ep_enable(struct usb_ep *_ep, 284 const struct usb_endpoint_descriptor *desc) 285 { 286 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 287 struct at91_udc *udc; 288 u16 maxpacket; 289 u32 tmp; 290 unsigned long flags; 291 292 if (!_ep || !ep 293 || !desc || _ep->name == ep0name 294 || desc->bDescriptorType != USB_DT_ENDPOINT 295 || (maxpacket = usb_endpoint_maxp(desc)) == 0 296 || maxpacket > ep->maxpacket) { 297 DBG("bad ep or descriptor\n"); 298 return -EINVAL; 299 } 300 301 udc = ep->udc; 302 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 303 DBG("bogus device state\n"); 304 return -ESHUTDOWN; 305 } 306 307 tmp = usb_endpoint_type(desc); 308 switch (tmp) { 309 case USB_ENDPOINT_XFER_CONTROL: 310 DBG("only one control endpoint\n"); 311 return -EINVAL; 312 case USB_ENDPOINT_XFER_INT: 313 if (maxpacket > 64) 314 goto bogus_max; 315 break; 316 case USB_ENDPOINT_XFER_BULK: 317 switch (maxpacket) { 318 case 8: 319 case 16: 320 case 32: 321 case 64: 322 goto ok; 323 } 324 bogus_max: 325 DBG("bogus maxpacket %d\n", maxpacket); 326 return -EINVAL; 327 case USB_ENDPOINT_XFER_ISOC: 328 if (!ep->is_pingpong) { 329 DBG("iso requires double buffering\n"); 330 return -EINVAL; 331 } 332 break; 333 } 334 335 ok: 336 spin_lock_irqsave(&udc->lock, flags); 337 338 /* initialize endpoint to match this descriptor */ 339 ep->is_in = usb_endpoint_dir_in(desc); 340 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); 341 ep->stopped = 0; 342 if (ep->is_in) 343 tmp |= 0x04; 344 tmp <<= 8; 345 tmp |= AT91_UDP_EPEDS; 346 __raw_writel(tmp, ep->creg); 347 348 ep->ep.maxpacket = maxpacket; 349 350 /* 351 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, 352 * since endpoint resets don't reset hw pingpong state. 353 */ 354 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 355 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 356 357 spin_unlock_irqrestore(&udc->lock, flags); 358 return 0; 359 } 360 361 static int at91_ep_disable (struct usb_ep * _ep) 362 { 363 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 364 struct at91_udc *udc = ep->udc; 365 unsigned long flags; 366 367 if (ep == &ep->udc->ep[0]) 368 return -EINVAL; 369 370 spin_lock_irqsave(&udc->lock, flags); 371 372 nuke(ep, -ESHUTDOWN); 373 374 /* restore the endpoint's pristine config */ 375 ep->ep.desc = NULL; 376 ep->ep.maxpacket = ep->maxpacket; 377 378 /* reset fifos and endpoint */ 379 if (ep->udc->clocked) { 380 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 381 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 382 __raw_writel(0, ep->creg); 383 } 384 385 spin_unlock_irqrestore(&udc->lock, flags); 386 return 0; 387 } 388 389 /* 390 * this is a PIO-only driver, so there's nothing 391 * interesting for request or buffer allocation. 392 */ 393 394 static struct usb_request * 395 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 396 { 397 struct at91_request *req; 398 399 req = kzalloc(sizeof (struct at91_request), gfp_flags); 400 if (!req) 401 return NULL; 402 403 INIT_LIST_HEAD(&req->queue); 404 return &req->req; 405 } 406 407 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) 408 { 409 struct at91_request *req; 410 411 req = container_of(_req, struct at91_request, req); 412 BUG_ON(!list_empty(&req->queue)); 413 kfree(req); 414 } 415 416 static int at91_ep_queue(struct usb_ep *_ep, 417 struct usb_request *_req, gfp_t gfp_flags) 418 { 419 struct at91_request *req; 420 struct at91_ep *ep; 421 struct at91_udc *udc; 422 int status; 423 unsigned long flags; 424 425 req = container_of(_req, struct at91_request, req); 426 ep = container_of(_ep, struct at91_ep, ep); 427 428 if (!_req || !_req->complete 429 || !_req->buf || !list_empty(&req->queue)) { 430 DBG("invalid request\n"); 431 return -EINVAL; 432 } 433 434 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) { 435 DBG("invalid ep\n"); 436 return -EINVAL; 437 } 438 439 udc = ep->udc; 440 441 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 442 DBG("invalid device\n"); 443 return -EINVAL; 444 } 445 446 _req->status = -EINPROGRESS; 447 _req->actual = 0; 448 449 spin_lock_irqsave(&udc->lock, flags); 450 451 /* try to kickstart any empty and idle queue */ 452 if (list_empty(&ep->queue) && !ep->stopped) { 453 int is_ep0; 454 455 /* 456 * If this control request has a non-empty DATA stage, this 457 * will start that stage. It works just like a non-control 458 * request (until the status stage starts, maybe early). 459 * 460 * If the data stage is empty, then this starts a successful 461 * IN/STATUS stage. (Unsuccessful ones use set_halt.) 462 */ 463 is_ep0 = (ep->ep.name == ep0name); 464 if (is_ep0) { 465 u32 tmp; 466 467 if (!udc->req_pending) { 468 status = -EINVAL; 469 goto done; 470 } 471 472 /* 473 * defer changing CONFG until after the gadget driver 474 * reconfigures the endpoints. 475 */ 476 if (udc->wait_for_config_ack) { 477 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 478 tmp ^= AT91_UDP_CONFG; 479 VDBG("toggle config\n"); 480 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 481 } 482 if (req->req.length == 0) { 483 ep0_in_status: 484 PACKET("ep0 in/status\n"); 485 status = 0; 486 tmp = __raw_readl(ep->creg); 487 tmp &= ~SET_FX; 488 tmp |= CLR_FX | AT91_UDP_TXPKTRDY; 489 __raw_writel(tmp, ep->creg); 490 udc->req_pending = 0; 491 goto done; 492 } 493 } 494 495 if (ep->is_in) 496 status = write_fifo(ep, req); 497 else { 498 status = read_fifo(ep, req); 499 500 /* IN/STATUS stage is otherwise triggered by irq */ 501 if (status && is_ep0) 502 goto ep0_in_status; 503 } 504 } else 505 status = 0; 506 507 if (req && !status) { 508 list_add_tail (&req->queue, &ep->queue); 509 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask); 510 } 511 done: 512 spin_unlock_irqrestore(&udc->lock, flags); 513 return (status < 0) ? status : 0; 514 } 515 516 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 517 { 518 struct at91_ep *ep; 519 struct at91_request *req; 520 unsigned long flags; 521 522 ep = container_of(_ep, struct at91_ep, ep); 523 if (!_ep || ep->ep.name == ep0name) 524 return -EINVAL; 525 526 spin_lock_irqsave(&udc->lock, flags); 527 528 /* make sure it's actually queued on this endpoint */ 529 list_for_each_entry (req, &ep->queue, queue) { 530 if (&req->req == _req) 531 break; 532 } 533 if (&req->req != _req) { 534 spin_unlock_irqrestore(&udc->lock, flags); 535 return -EINVAL; 536 } 537 538 done(ep, req, -ECONNRESET); 539 spin_unlock_irqrestore(&udc->lock, flags); 540 return 0; 541 } 542 543 static int at91_ep_set_halt(struct usb_ep *_ep, int value) 544 { 545 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 546 struct at91_udc *udc = ep->udc; 547 u32 __iomem *creg; 548 u32 csr; 549 unsigned long flags; 550 int status = 0; 551 552 if (!_ep || ep->is_iso || !ep->udc->clocked) 553 return -EINVAL; 554 555 creg = ep->creg; 556 spin_lock_irqsave(&udc->lock, flags); 557 558 csr = __raw_readl(creg); 559 560 /* 561 * fail with still-busy IN endpoints, ensuring correct sequencing 562 * of data tx then stall. note that the fifo rx bytecount isn't 563 * completely accurate as a tx bytecount. 564 */ 565 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) 566 status = -EAGAIN; 567 else { 568 csr |= CLR_FX; 569 csr &= ~SET_FX; 570 if (value) { 571 csr |= AT91_UDP_FORCESTALL; 572 VDBG("halt %s\n", ep->ep.name); 573 } else { 574 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 575 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 576 csr &= ~AT91_UDP_FORCESTALL; 577 } 578 __raw_writel(csr, creg); 579 } 580 581 spin_unlock_irqrestore(&udc->lock, flags); 582 return status; 583 } 584 585 static const struct usb_ep_ops at91_ep_ops = { 586 .enable = at91_ep_enable, 587 .disable = at91_ep_disable, 588 .alloc_request = at91_ep_alloc_request, 589 .free_request = at91_ep_free_request, 590 .queue = at91_ep_queue, 591 .dequeue = at91_ep_dequeue, 592 .set_halt = at91_ep_set_halt, 593 /* there's only imprecise fifo status reporting */ 594 }; 595 596 /*-------------------------------------------------------------------------*/ 597 598 static int at91_get_frame(struct usb_gadget *gadget) 599 { 600 struct at91_udc *udc = to_udc(gadget); 601 602 if (!to_udc(gadget)->clocked) 603 return -EINVAL; 604 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; 605 } 606 607 static int at91_wakeup(struct usb_gadget *gadget) 608 { 609 struct at91_udc *udc = to_udc(gadget); 610 u32 glbstate; 611 int status = -EINVAL; 612 unsigned long flags; 613 614 DBG("%s\n", __func__ ); 615 spin_lock_irqsave(&udc->lock, flags); 616 617 if (!udc->clocked || !udc->suspended) 618 goto done; 619 620 /* NOTE: some "early versions" handle ESR differently ... */ 621 622 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); 623 if (!(glbstate & AT91_UDP_ESR)) 624 goto done; 625 glbstate |= AT91_UDP_ESR; 626 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); 627 628 done: 629 spin_unlock_irqrestore(&udc->lock, flags); 630 return status; 631 } 632 633 /* reinit == restore initial software state */ 634 static void udc_reinit(struct at91_udc *udc) 635 { 636 u32 i; 637 638 INIT_LIST_HEAD(&udc->gadget.ep_list); 639 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); 640 641 for (i = 0; i < NUM_ENDPOINTS; i++) { 642 struct at91_ep *ep = &udc->ep[i]; 643 644 if (i != 0) 645 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 646 ep->ep.desc = NULL; 647 ep->stopped = 0; 648 ep->fifo_bank = 0; 649 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 650 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); 651 /* initialize one queue per endpoint */ 652 INIT_LIST_HEAD(&ep->queue); 653 } 654 } 655 656 static void reset_gadget(struct at91_udc *udc) 657 { 658 struct usb_gadget_driver *driver = udc->driver; 659 int i; 660 661 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 662 driver = NULL; 663 udc->gadget.speed = USB_SPEED_UNKNOWN; 664 udc->suspended = 0; 665 666 for (i = 0; i < NUM_ENDPOINTS; i++) { 667 struct at91_ep *ep = &udc->ep[i]; 668 669 ep->stopped = 1; 670 nuke(ep, -ESHUTDOWN); 671 } 672 if (driver) { 673 spin_unlock(&udc->lock); 674 udc->driver->disconnect(&udc->gadget); 675 spin_lock(&udc->lock); 676 } 677 678 udc_reinit(udc); 679 } 680 681 static void stop_activity(struct at91_udc *udc) 682 { 683 struct usb_gadget_driver *driver = udc->driver; 684 int i; 685 686 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 687 driver = NULL; 688 udc->gadget.speed = USB_SPEED_UNKNOWN; 689 udc->suspended = 0; 690 691 for (i = 0; i < NUM_ENDPOINTS; i++) { 692 struct at91_ep *ep = &udc->ep[i]; 693 ep->stopped = 1; 694 nuke(ep, -ESHUTDOWN); 695 } 696 if (driver) { 697 spin_unlock(&udc->lock); 698 driver->disconnect(&udc->gadget); 699 spin_lock(&udc->lock); 700 } 701 702 udc_reinit(udc); 703 } 704 705 static void clk_on(struct at91_udc *udc) 706 { 707 if (udc->clocked) 708 return; 709 udc->clocked = 1; 710 } 711 712 static void clk_off(struct at91_udc *udc) 713 { 714 if (!udc->clocked) 715 return; 716 udc->clocked = 0; 717 udc->gadget.speed = USB_SPEED_UNKNOWN; 718 } 719 720 /* 721 * activate/deactivate link with host; minimize power usage for 722 * inactive links by cutting clocks and transceiver power. 723 */ 724 static void pullup(struct at91_udc *udc, int is_on) 725 { 726 if (!udc->enabled || !udc->vbus) 727 is_on = 0; 728 DBG("%sactive\n", is_on ? "" : "in"); 729 730 if (is_on) { 731 clk_on(udc); 732 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 733 at91_udp_write(udc, AT91_UDP_TXVC, 0); 734 } else { 735 stop_activity(udc); 736 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 737 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 738 clk_off(udc); 739 } 740 741 if (udc->caps && udc->caps->pullup) 742 udc->caps->pullup(udc, is_on); 743 } 744 745 /* vbus is here! turn everything on that's ready */ 746 static int at91_vbus_session(struct usb_gadget *gadget, int is_active) 747 { 748 struct at91_udc *udc = to_udc(gadget); 749 unsigned long flags; 750 751 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ 752 spin_lock_irqsave(&udc->lock, flags); 753 udc->vbus = (is_active != 0); 754 if (udc->driver) 755 pullup(udc, is_active); 756 else 757 pullup(udc, 0); 758 spin_unlock_irqrestore(&udc->lock, flags); 759 return 0; 760 } 761 762 static int at91_pullup(struct usb_gadget *gadget, int is_on) 763 { 764 struct at91_udc *udc = to_udc(gadget); 765 unsigned long flags; 766 767 spin_lock_irqsave(&udc->lock, flags); 768 udc->enabled = is_on = !!is_on; 769 pullup(udc, is_on); 770 spin_unlock_irqrestore(&udc->lock, flags); 771 return 0; 772 } 773 774 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) 775 { 776 struct at91_udc *udc = to_udc(gadget); 777 unsigned long flags; 778 779 spin_lock_irqsave(&udc->lock, flags); 780 udc->selfpowered = (is_on != 0); 781 spin_unlock_irqrestore(&udc->lock, flags); 782 return 0; 783 } 784 785 static int at91_start(struct usb_gadget *gadget, 786 struct usb_gadget_driver *driver); 787 static int at91_stop(struct usb_gadget *gadget); 788 789 static const struct usb_gadget_ops at91_udc_ops = { 790 .get_frame = at91_get_frame, 791 .wakeup = at91_wakeup, 792 .set_selfpowered = at91_set_selfpowered, 793 .vbus_session = at91_vbus_session, 794 .pullup = at91_pullup, 795 .udc_start = at91_start, 796 .udc_stop = at91_stop, 797 798 /* 799 * VBUS-powered devices may also also want to support bigger 800 * power budgets after an appropriate SET_CONFIGURATION. 801 */ 802 /* .vbus_power = at91_vbus_power, */ 803 }; 804 805 /*-------------------------------------------------------------------------*/ 806 807 static int handle_ep(struct at91_ep *ep) 808 { 809 struct at91_request *req; 810 u32 __iomem *creg = ep->creg; 811 u32 csr = __raw_readl(creg); 812 813 if (!list_empty(&ep->queue)) 814 req = list_entry(ep->queue.next, 815 struct at91_request, queue); 816 else 817 req = NULL; 818 819 if (ep->is_in) { 820 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { 821 csr |= CLR_FX; 822 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); 823 __raw_writel(csr, creg); 824 } 825 if (req) 826 return write_fifo(ep, req); 827 828 } else { 829 if (csr & AT91_UDP_STALLSENT) { 830 /* STALLSENT bit == ISOERR */ 831 if (ep->is_iso && req) 832 req->req.status = -EILSEQ; 833 csr |= CLR_FX; 834 csr &= ~(SET_FX | AT91_UDP_STALLSENT); 835 __raw_writel(csr, creg); 836 csr = __raw_readl(creg); 837 } 838 if (req && (csr & RX_DATA_READY)) 839 return read_fifo(ep, req); 840 } 841 return 0; 842 } 843 844 union setup { 845 u8 raw[8]; 846 struct usb_ctrlrequest r; 847 }; 848 849 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) 850 { 851 u32 __iomem *creg = ep->creg; 852 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 853 unsigned rxcount, i = 0; 854 u32 tmp; 855 union setup pkt; 856 int status = 0; 857 858 /* read and ack SETUP; hard-fail for bogus packets */ 859 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; 860 if (likely(rxcount == 8)) { 861 while (rxcount--) 862 pkt.raw[i++] = __raw_readb(dreg); 863 if (pkt.r.bRequestType & USB_DIR_IN) { 864 csr |= AT91_UDP_DIR; 865 ep->is_in = 1; 866 } else { 867 csr &= ~AT91_UDP_DIR; 868 ep->is_in = 0; 869 } 870 } else { 871 /* REVISIT this happens sometimes under load; why?? */ 872 ERR("SETUP len %d, csr %08x\n", rxcount, csr); 873 status = -EINVAL; 874 } 875 csr |= CLR_FX; 876 csr &= ~(SET_FX | AT91_UDP_RXSETUP); 877 __raw_writel(csr, creg); 878 udc->wait_for_addr_ack = 0; 879 udc->wait_for_config_ack = 0; 880 ep->stopped = 0; 881 if (unlikely(status != 0)) 882 goto stall; 883 884 #define w_index le16_to_cpu(pkt.r.wIndex) 885 #define w_value le16_to_cpu(pkt.r.wValue) 886 #define w_length le16_to_cpu(pkt.r.wLength) 887 888 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 889 pkt.r.bRequestType, pkt.r.bRequest, 890 w_value, w_index, w_length); 891 892 /* 893 * A few standard requests get handled here, ones that touch 894 * hardware ... notably for device and endpoint features. 895 */ 896 udc->req_pending = 1; 897 csr = __raw_readl(creg); 898 csr |= CLR_FX; 899 csr &= ~SET_FX; 900 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { 901 902 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 903 | USB_REQ_SET_ADDRESS: 904 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); 905 udc->addr = w_value; 906 udc->wait_for_addr_ack = 1; 907 udc->req_pending = 0; 908 /* FADDR is set later, when we ack host STATUS */ 909 return; 910 911 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 912 | USB_REQ_SET_CONFIGURATION: 913 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; 914 if (pkt.r.wValue) 915 udc->wait_for_config_ack = (tmp == 0); 916 else 917 udc->wait_for_config_ack = (tmp != 0); 918 if (udc->wait_for_config_ack) 919 VDBG("wait for config\n"); 920 /* CONFG is toggled later, if gadget driver succeeds */ 921 break; 922 923 /* 924 * Hosts may set or clear remote wakeup status, and 925 * devices may report they're VBUS powered. 926 */ 927 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 928 | USB_REQ_GET_STATUS: 929 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); 930 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) 931 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); 932 PACKET("get device status\n"); 933 __raw_writeb(tmp, dreg); 934 __raw_writeb(0, dreg); 935 goto write_in; 936 /* then STATUS starts later, automatically */ 937 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 938 | USB_REQ_SET_FEATURE: 939 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 940 goto stall; 941 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 942 tmp |= AT91_UDP_ESR; 943 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 944 goto succeed; 945 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 946 | USB_REQ_CLEAR_FEATURE: 947 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 948 goto stall; 949 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 950 tmp &= ~AT91_UDP_ESR; 951 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 952 goto succeed; 953 954 /* 955 * Interfaces have no feature settings; this is pretty useless. 956 * we won't even insist the interface exists... 957 */ 958 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 959 | USB_REQ_GET_STATUS: 960 PACKET("get interface status\n"); 961 __raw_writeb(0, dreg); 962 __raw_writeb(0, dreg); 963 goto write_in; 964 /* then STATUS starts later, automatically */ 965 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 966 | USB_REQ_SET_FEATURE: 967 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 968 | USB_REQ_CLEAR_FEATURE: 969 goto stall; 970 971 /* 972 * Hosts may clear bulk/intr endpoint halt after the gadget 973 * driver sets it (not widely used); or set it (for testing) 974 */ 975 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 976 | USB_REQ_GET_STATUS: 977 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 978 ep = &udc->ep[tmp]; 979 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc)) 980 goto stall; 981 982 if (tmp) { 983 if ((w_index & USB_DIR_IN)) { 984 if (!ep->is_in) 985 goto stall; 986 } else if (ep->is_in) 987 goto stall; 988 } 989 PACKET("get %s status\n", ep->ep.name); 990 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) 991 tmp = (1 << USB_ENDPOINT_HALT); 992 else 993 tmp = 0; 994 __raw_writeb(tmp, dreg); 995 __raw_writeb(0, dreg); 996 goto write_in; 997 /* then STATUS starts later, automatically */ 998 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 999 | USB_REQ_SET_FEATURE: 1000 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1001 ep = &udc->ep[tmp]; 1002 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1003 goto stall; 1004 if (!ep->ep.desc || ep->is_iso) 1005 goto stall; 1006 if ((w_index & USB_DIR_IN)) { 1007 if (!ep->is_in) 1008 goto stall; 1009 } else if (ep->is_in) 1010 goto stall; 1011 1012 tmp = __raw_readl(ep->creg); 1013 tmp &= ~SET_FX; 1014 tmp |= CLR_FX | AT91_UDP_FORCESTALL; 1015 __raw_writel(tmp, ep->creg); 1016 goto succeed; 1017 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1018 | USB_REQ_CLEAR_FEATURE: 1019 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1020 ep = &udc->ep[tmp]; 1021 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1022 goto stall; 1023 if (tmp == 0) 1024 goto succeed; 1025 if (!ep->ep.desc || ep->is_iso) 1026 goto stall; 1027 if ((w_index & USB_DIR_IN)) { 1028 if (!ep->is_in) 1029 goto stall; 1030 } else if (ep->is_in) 1031 goto stall; 1032 1033 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 1034 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 1035 tmp = __raw_readl(ep->creg); 1036 tmp |= CLR_FX; 1037 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); 1038 __raw_writel(tmp, ep->creg); 1039 if (!list_empty(&ep->queue)) 1040 handle_ep(ep); 1041 goto succeed; 1042 } 1043 1044 #undef w_value 1045 #undef w_index 1046 #undef w_length 1047 1048 /* pass request up to the gadget driver */ 1049 if (udc->driver) { 1050 spin_unlock(&udc->lock); 1051 status = udc->driver->setup(&udc->gadget, &pkt.r); 1052 spin_lock(&udc->lock); 1053 } 1054 else 1055 status = -ENODEV; 1056 if (status < 0) { 1057 stall: 1058 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1059 pkt.r.bRequestType, pkt.r.bRequest, status); 1060 csr |= AT91_UDP_FORCESTALL; 1061 __raw_writel(csr, creg); 1062 udc->req_pending = 0; 1063 } 1064 return; 1065 1066 succeed: 1067 /* immediate successful (IN) STATUS after zero length DATA */ 1068 PACKET("ep0 in/status\n"); 1069 write_in: 1070 csr |= AT91_UDP_TXPKTRDY; 1071 __raw_writel(csr, creg); 1072 udc->req_pending = 0; 1073 } 1074 1075 static void handle_ep0(struct at91_udc *udc) 1076 { 1077 struct at91_ep *ep0 = &udc->ep[0]; 1078 u32 __iomem *creg = ep0->creg; 1079 u32 csr = __raw_readl(creg); 1080 struct at91_request *req; 1081 1082 if (unlikely(csr & AT91_UDP_STALLSENT)) { 1083 nuke(ep0, -EPROTO); 1084 udc->req_pending = 0; 1085 csr |= CLR_FX; 1086 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); 1087 __raw_writel(csr, creg); 1088 VDBG("ep0 stalled\n"); 1089 csr = __raw_readl(creg); 1090 } 1091 if (csr & AT91_UDP_RXSETUP) { 1092 nuke(ep0, 0); 1093 udc->req_pending = 0; 1094 handle_setup(udc, ep0, csr); 1095 return; 1096 } 1097 1098 if (list_empty(&ep0->queue)) 1099 req = NULL; 1100 else 1101 req = list_entry(ep0->queue.next, struct at91_request, queue); 1102 1103 /* host ACKed an IN packet that we sent */ 1104 if (csr & AT91_UDP_TXCOMP) { 1105 csr |= CLR_FX; 1106 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 1107 1108 /* write more IN DATA? */ 1109 if (req && ep0->is_in) { 1110 if (handle_ep(ep0)) 1111 udc->req_pending = 0; 1112 1113 /* 1114 * Ack after: 1115 * - last IN DATA packet (including GET_STATUS) 1116 * - IN/STATUS for OUT DATA 1117 * - IN/STATUS for any zero-length DATA stage 1118 * except for the IN DATA case, the host should send 1119 * an OUT status later, which we'll ack. 1120 */ 1121 } else { 1122 udc->req_pending = 0; 1123 __raw_writel(csr, creg); 1124 1125 /* 1126 * SET_ADDRESS takes effect only after the STATUS 1127 * (to the original address) gets acked. 1128 */ 1129 if (udc->wait_for_addr_ack) { 1130 u32 tmp; 1131 1132 at91_udp_write(udc, AT91_UDP_FADDR, 1133 AT91_UDP_FEN | udc->addr); 1134 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1135 tmp &= ~AT91_UDP_FADDEN; 1136 if (udc->addr) 1137 tmp |= AT91_UDP_FADDEN; 1138 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1139 1140 udc->wait_for_addr_ack = 0; 1141 VDBG("address %d\n", udc->addr); 1142 } 1143 } 1144 } 1145 1146 /* OUT packet arrived ... */ 1147 else if (csr & AT91_UDP_RX_DATA_BK0) { 1148 csr |= CLR_FX; 1149 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 1150 1151 /* OUT DATA stage */ 1152 if (!ep0->is_in) { 1153 if (req) { 1154 if (handle_ep(ep0)) { 1155 /* send IN/STATUS */ 1156 PACKET("ep0 in/status\n"); 1157 csr = __raw_readl(creg); 1158 csr &= ~SET_FX; 1159 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 1160 __raw_writel(csr, creg); 1161 udc->req_pending = 0; 1162 } 1163 } else if (udc->req_pending) { 1164 /* 1165 * AT91 hardware has a hard time with this 1166 * "deferred response" mode for control-OUT 1167 * transfers. (For control-IN it's fine.) 1168 * 1169 * The normal solution leaves OUT data in the 1170 * fifo until the gadget driver is ready. 1171 * We couldn't do that here without disabling 1172 * the IRQ that tells about SETUP packets, 1173 * e.g. when the host gets impatient... 1174 * 1175 * Working around it by copying into a buffer 1176 * would almost be a non-deferred response, 1177 * except that it wouldn't permit reliable 1178 * stalling of the request. Instead, demand 1179 * that gadget drivers not use this mode. 1180 */ 1181 DBG("no control-OUT deferred responses!\n"); 1182 __raw_writel(csr | AT91_UDP_FORCESTALL, creg); 1183 udc->req_pending = 0; 1184 } 1185 1186 /* STATUS stage for control-IN; ack. */ 1187 } else { 1188 PACKET("ep0 out/status ACK\n"); 1189 __raw_writel(csr, creg); 1190 1191 /* "early" status stage */ 1192 if (req) 1193 done(ep0, req, 0); 1194 } 1195 } 1196 } 1197 1198 static irqreturn_t at91_udc_irq(struct at91_udc *udc) 1199 { 1200 u32 rescans = 5; 1201 int disable_clock = 0; 1202 unsigned long flags; 1203 1204 spin_lock_irqsave(&udc->lock, flags); 1205 1206 if (!udc->clocked) { 1207 clk_on(udc); 1208 disable_clock = 1; 1209 } 1210 1211 while (rescans--) { 1212 u32 status; 1213 1214 status = at91_udp_read(udc, AT91_UDP_ISR) 1215 & at91_udp_read(udc, AT91_UDP_IMR); 1216 if (!status) 1217 break; 1218 1219 /* USB reset irq: not maskable */ 1220 if (status & AT91_UDP_ENDBUSRES) { 1221 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); 1222 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS); 1223 /* Atmel code clears this irq twice */ 1224 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1225 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1226 VDBG("end bus reset\n"); 1227 udc->addr = 0; 1228 reset_gadget(udc); 1229 1230 /* enable ep0 */ 1231 at91_udp_write(udc, AT91_UDP_CSR(0), 1232 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); 1233 udc->gadget.speed = USB_SPEED_FULL; 1234 udc->suspended = 0; 1235 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0)); 1236 1237 /* 1238 * NOTE: this driver keeps clocks off unless the 1239 * USB host is present. That saves power, but for 1240 * boards that don't support VBUS detection, both 1241 * clocks need to be active most of the time. 1242 */ 1243 1244 /* host initiated suspend (3+ms bus idle) */ 1245 } else if (status & AT91_UDP_RXSUSP) { 1246 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); 1247 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); 1248 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); 1249 /* VDBG("bus suspend\n"); */ 1250 if (udc->suspended) 1251 continue; 1252 udc->suspended = 1; 1253 1254 /* 1255 * NOTE: when suspending a VBUS-powered device, the 1256 * gadget driver should switch into slow clock mode 1257 * and then into standby to avoid drawing more than 1258 * 500uA power (2500uA for some high-power configs). 1259 */ 1260 if (udc->driver && udc->driver->suspend) { 1261 spin_unlock(&udc->lock); 1262 udc->driver->suspend(&udc->gadget); 1263 spin_lock(&udc->lock); 1264 } 1265 1266 /* host initiated resume */ 1267 } else if (status & AT91_UDP_RXRSM) { 1268 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 1269 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP); 1270 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 1271 /* VDBG("bus resume\n"); */ 1272 if (!udc->suspended) 1273 continue; 1274 udc->suspended = 0; 1275 1276 /* 1277 * NOTE: for a VBUS-powered device, the gadget driver 1278 * would normally want to switch out of slow clock 1279 * mode into normal mode. 1280 */ 1281 if (udc->driver && udc->driver->resume) { 1282 spin_unlock(&udc->lock); 1283 udc->driver->resume(&udc->gadget); 1284 spin_lock(&udc->lock); 1285 } 1286 1287 /* endpoint IRQs are cleared by handling them */ 1288 } else { 1289 int i; 1290 unsigned mask = 1; 1291 struct at91_ep *ep = &udc->ep[1]; 1292 1293 if (status & mask) 1294 handle_ep0(udc); 1295 for (i = 1; i < NUM_ENDPOINTS; i++) { 1296 mask <<= 1; 1297 if (status & mask) 1298 handle_ep(ep); 1299 ep++; 1300 } 1301 } 1302 } 1303 1304 if (disable_clock) 1305 clk_off(udc); 1306 1307 spin_unlock_irqrestore(&udc->lock, flags); 1308 1309 return IRQ_HANDLED; 1310 } 1311 1312 /*-------------------------------------------------------------------------*/ 1313 1314 static int at91_start(struct usb_gadget *gadget, 1315 struct usb_gadget_driver *driver) 1316 { 1317 struct at91_udc *udc = controller; 1318 1319 udc->driver = driver; 1320 udc->enabled = 1; 1321 udc->selfpowered = 1; 1322 1323 return 0; 1324 } 1325 1326 static int at91_stop(struct usb_gadget *gadget) 1327 { 1328 struct at91_udc *udc = controller; 1329 unsigned long flags; 1330 1331 spin_lock_irqsave(&udc->lock, flags); 1332 udc->enabled = 0; 1333 at91_udp_write(udc, AT91_UDP_IDR, ~0); 1334 spin_unlock_irqrestore(&udc->lock, flags); 1335 1336 udc->driver = NULL; 1337 1338 return 0; 1339 } 1340 1341 /*-------------------------------------------------------------------------*/ 1342 1343 #if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20) 1344 static int at91sam9260_udc_init(struct at91_udc *udc) 1345 { 1346 struct at91_ep *ep; 1347 int i; 1348 1349 for (i = 0; i < NUM_ENDPOINTS; i++) { 1350 ep = &udc->ep[i]; 1351 1352 switch (i) { 1353 case 0 ... 3: 1354 ep->maxpacket = 64; 1355 break; 1356 case 4 ... 5: 1357 ep->maxpacket = 512; 1358 break; 1359 } 1360 } 1361 1362 return 0; 1363 } 1364 1365 static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on) 1366 { 1367 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 1368 1369 if (is_on) 1370 txvc |= AT91_UDP_TXVC_PUON; 1371 else 1372 txvc &= ~AT91_UDP_TXVC_PUON; 1373 1374 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 1375 } 1376 1377 static const struct at91_udc_caps at91sam9260_udc_caps = { 1378 .init = at91sam9260_udc_init, 1379 .pullup = at91sam9260_udc_pullup, 1380 }; 1381 #endif 1382 1383 #if defined(CONFIG_AT91SAM9261) 1384 static int at91sam9261_udc_init(struct at91_udc *udc) 1385 { 1386 struct at91_ep *ep; 1387 int i; 1388 1389 for (i = 0; i < NUM_ENDPOINTS; i++) { 1390 ep = &udc->ep[i]; 1391 1392 switch (i) { 1393 case 0: 1394 ep->maxpacket = 8; 1395 break; 1396 case 1 ... 3: 1397 ep->maxpacket = 64; 1398 break; 1399 case 4 ... 5: 1400 ep->maxpacket = 256; 1401 break; 1402 } 1403 } 1404 1405 udc->matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX; 1406 1407 if (IS_ERR(udc->matrix)) 1408 return PTR_ERR(udc->matrix); 1409 1410 return 0; 1411 } 1412 1413 static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on) 1414 { 1415 u32 usbpucr = 0; 1416 1417 usbpucr = readl(&udc->matrix->pucr); 1418 if (is_on) 1419 usbpucr |= AT91_MATRIX_USBPUCR_PUON; 1420 1421 writel(usbpucr, &udc->matrix->pucr); 1422 } 1423 1424 static const struct at91_udc_caps at91sam9261_udc_caps = { 1425 .init = at91sam9261_udc_init, 1426 .pullup = at91sam9261_udc_pullup, 1427 }; 1428 #endif 1429 1430 int usb_gadget_handle_interrupts(int index) 1431 { 1432 struct at91_udc *udc = controller; 1433 1434 return at91_udc_irq(udc); 1435 } 1436 1437 int usb_gadget_register_driver(struct usb_gadget_driver *driver) 1438 { 1439 struct at91_udc *udc = controller; 1440 int ret; 1441 1442 if (!driver || !driver->bind || !driver->setup) { 1443 printf("bad paramter\n"); 1444 return -EINVAL; 1445 } 1446 1447 if (udc->driver) { 1448 printf("UDC already has a gadget driver\n"); 1449 return -EBUSY; 1450 } 1451 1452 at91_start(&udc->gadget, driver); 1453 1454 udc->driver = driver; 1455 1456 ret = driver->bind(&udc->gadget); 1457 if (ret) { 1458 pr_err("driver->bind() returned %d\n", ret); 1459 udc->driver = NULL; 1460 } 1461 1462 return ret; 1463 } 1464 1465 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) 1466 { 1467 struct at91_udc *udc = controller; 1468 1469 if (!driver || !driver->unbind || !driver->disconnect) { 1470 pr_err("bad paramter\n"); 1471 return -EINVAL; 1472 } 1473 1474 driver->disconnect(&udc->gadget); 1475 driver->unbind(&udc->gadget); 1476 udc->driver = NULL; 1477 1478 at91_stop(&udc->gadget); 1479 1480 return 0; 1481 } 1482 1483 int at91_udc_probe(struct at91_udc_data *pdata) 1484 { 1485 struct at91_udc *udc; 1486 int retval; 1487 struct at91_ep *ep; 1488 int i; 1489 1490 udc = kzalloc(sizeof(*udc), GFP_KERNEL); 1491 if (!udc) 1492 return -ENOMEM; 1493 1494 controller = udc; 1495 memcpy(&udc->board, pdata, sizeof(struct at91_udc_data)); 1496 if (udc->board.vbus_pin) { 1497 printf("%s: gpio vbus pin not supported yet.\n", __func__); 1498 return -ENXIO; 1499 } else { 1500 DBG("no VBUS detection, assuming always-on\n"); 1501 udc->vbus = 1; 1502 } 1503 1504 #if defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20) 1505 udc->caps = &at91sam9260_udc_caps; 1506 #endif 1507 1508 udc->enabled = 0; 1509 spin_lock_init(&udc->lock); 1510 1511 udc->gadget.ops = &at91_udc_ops; 1512 udc->gadget.ep0 = &udc->ep[0].ep; 1513 udc->gadget.name = driver_name; 1514 1515 for (i = 0; i < NUM_ENDPOINTS; i++) { 1516 ep = &udc->ep[i]; 1517 ep->ep.name = ep_names[i]; 1518 ep->ep.ops = &at91_ep_ops; 1519 ep->udc = udc; 1520 ep->int_mask = (1 << i); 1521 if (i != 0 && i != 3) 1522 ep->is_pingpong = 1; 1523 } 1524 1525 udc->udp_baseaddr = (void *)udc->board.baseaddr; 1526 if (IS_ERR(udc->udp_baseaddr)) 1527 return PTR_ERR(udc->udp_baseaddr); 1528 1529 if (udc->caps && udc->caps->init) { 1530 retval = udc->caps->init(udc); 1531 if (retval) 1532 return retval; 1533 } 1534 1535 udc_reinit(udc); 1536 1537 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 1538 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); 1539 /* Clear all pending interrupts - UDP may be used by bootloader. */ 1540 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); 1541 1542 INFO("%s version %s\n", driver_name, DRIVER_VERSION); 1543 return 0; 1544 } 1545