1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * at91_udc -- driver for at91-series USB peripheral controller 4 * 5 * Copyright (C) 2004 by Thomas Rathbone 6 * Copyright (C) 2005 by HP Labs 7 * Copyright (C) 2005 by David Brownell 8 */ 9 10#undef VERBOSE_DEBUG 11#undef PACKET_TRACE 12 13#include <linux/kernel.h> 14#include <linux/module.h> 15#include <linux/platform_device.h> 16#include <linux/delay.h> 17#include <linux/ioport.h> 18#include <linux/slab.h> 19#include <linux/errno.h> 20#include <linux/list.h> 21#include <linux/interrupt.h> 22#include <linux/proc_fs.h> 23#include <linux/prefetch.h> 24#include <linux/clk.h> 25#include <linux/usb/ch9.h> 26#include <linux/usb/gadget.h> 27#include <linux/of.h> 28#include <linux/of_gpio.h> 29#include <linux/platform_data/atmel.h> 30#include <linux/regmap.h> 31#include <linux/mfd/syscon.h> 32#include <linux/mfd/syscon/atmel-matrix.h> 33 34#include "at91_udc.h" 35 36 37/* 38 * This controller is simple and PIO-only. It's used in many AT91-series 39 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), 40 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. 41 * 42 * This driver expects the board has been wired with two GPIOs supporting 43 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the 44 * testing hasn't covered such cases.) 45 * 46 * The pullup is most important (so it's integrated on sam926x parts). It 47 * provides software control over whether the host enumerates the device. 48 * 49 * The VBUS sensing helps during enumeration, and allows both USB clocks 50 * (and the transceiver) to stay gated off until they're necessary, saving 51 * power. During USB suspend, the 48 MHz clock is gated off in hardware; 52 * it may also be gated off by software during some Linux sleep states. 53 */ 54 55#define DRIVER_VERSION "3 May 2006" 56 57static const char driver_name [] = "at91_udc"; 58 59static const struct { 60 const char *name; 61 const struct usb_ep_caps caps; 62} ep_info[] = { 63#define EP_INFO(_name, _caps) \ 64 { \ 65 .name = _name, \ 66 .caps = _caps, \ 67 } 68 69 EP_INFO("ep0", 70 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 71 EP_INFO("ep1", 72 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 73 EP_INFO("ep2", 74 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 75 EP_INFO("ep3-int", 76 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)), 77 EP_INFO("ep4", 78 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 79 EP_INFO("ep5", 80 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 81 82#undef EP_INFO 83}; 84 85#define ep0name ep_info[0].name 86 87#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000) 88 89#define at91_udp_read(udc, reg) \ 90 __raw_readl((udc)->udp_baseaddr + (reg)) 91#define at91_udp_write(udc, reg, val) \ 92 __raw_writel((val), (udc)->udp_baseaddr + (reg)) 93 94/*-------------------------------------------------------------------------*/ 95 96#ifdef CONFIG_USB_GADGET_DEBUG_FILES 97 98#include <linux/seq_file.h> 99 100static const char debug_filename[] = "driver/udc"; 101 102#define FOURBITS "%s%s%s%s" 103#define EIGHTBITS FOURBITS FOURBITS 104 105static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) 106{ 107 static char *types[] = { 108 "control", "out-iso", "out-bulk", "out-int", 109 "BOGUS", "in-iso", "in-bulk", "in-int"}; 110 111 u32 csr; 112 struct at91_request *req; 113 unsigned long flags; 114 struct at91_udc *udc = ep->udc; 115 116 spin_lock_irqsave(&udc->lock, flags); 117 118 csr = __raw_readl(ep->creg); 119 120 /* NOTE: not collecting per-endpoint irq statistics... */ 121 122 seq_printf(s, "\n"); 123 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", 124 ep->ep.name, ep->ep.maxpacket, 125 ep->is_in ? "in" : "out", 126 ep->is_iso ? " iso" : "", 127 ep->is_pingpong 128 ? (ep->fifo_bank ? "pong" : "ping") 129 : "", 130 ep->stopped ? " stopped" : ""); 131 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", 132 csr, 133 (csr & 0x07ff0000) >> 16, 134 (csr & (1 << 15)) ? "enabled" : "disabled", 135 (csr & (1 << 11)) ? "DATA1" : "DATA0", 136 types[(csr & 0x700) >> 8], 137 138 /* iff type is control then print current direction */ 139 (!(csr & 0x700)) 140 ? ((csr & (1 << 7)) ? " IN" : " OUT") 141 : "", 142 (csr & (1 << 6)) ? " rxdatabk1" : "", 143 (csr & (1 << 5)) ? " forcestall" : "", 144 (csr & (1 << 4)) ? " txpktrdy" : "", 145 146 (csr & (1 << 3)) ? " stallsent" : "", 147 (csr & (1 << 2)) ? " rxsetup" : "", 148 (csr & (1 << 1)) ? " rxdatabk0" : "", 149 (csr & (1 << 0)) ? " txcomp" : ""); 150 if (list_empty (&ep->queue)) 151 seq_printf(s, "\t(queue empty)\n"); 152 153 else list_for_each_entry (req, &ep->queue, queue) { 154 unsigned length = req->req.actual; 155 156 seq_printf(s, "\treq %p len %d/%d buf %p\n", 157 &req->req, length, 158 req->req.length, req->req.buf); 159 } 160 spin_unlock_irqrestore(&udc->lock, flags); 161} 162 163static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) 164{ 165 int i; 166 167 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, 168 (mask & (1 << 13)) ? " wakeup" : "", 169 (mask & (1 << 12)) ? " endbusres" : "", 170 171 (mask & (1 << 11)) ? " sofint" : "", 172 (mask & (1 << 10)) ? " extrsm" : "", 173 (mask & (1 << 9)) ? " rxrsm" : "", 174 (mask & (1 << 8)) ? " rxsusp" : ""); 175 for (i = 0; i < 8; i++) { 176 if (mask & (1 << i)) 177 seq_printf(s, " ep%d", i); 178 } 179 seq_printf(s, "\n"); 180} 181 182static int proc_udc_show(struct seq_file *s, void *unused) 183{ 184 struct at91_udc *udc = s->private; 185 struct at91_ep *ep; 186 u32 tmp; 187 188 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); 189 190 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", 191 udc->vbus ? "present" : "off", 192 udc->enabled 193 ? (udc->vbus ? "active" : "enabled") 194 : "disabled", 195 udc->gadget.is_selfpowered ? "self" : "VBUS", 196 udc->suspended ? ", suspended" : "", 197 udc->driver ? udc->driver->driver.name : "(none)"); 198 199 /* don't access registers when interface isn't clocked */ 200 if (!udc->clocked) { 201 seq_printf(s, "(not clocked)\n"); 202 return 0; 203 } 204 205 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM); 206 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, 207 (tmp & AT91_UDP_FRM_OK) ? " ok" : "", 208 (tmp & AT91_UDP_FRM_ERR) ? " err" : "", 209 (tmp & AT91_UDP_NUM)); 210 211 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 212 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, 213 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", 214 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", 215 (tmp & AT91_UDP_ESR) ? " esr" : "", 216 (tmp & AT91_UDP_CONFG) ? " confg" : "", 217 (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); 218 219 tmp = at91_udp_read(udc, AT91_UDP_FADDR); 220 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, 221 (tmp & AT91_UDP_FEN) ? " fen" : "", 222 (tmp & AT91_UDP_FADD)); 223 224 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR)); 225 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR)); 226 227 if (udc->enabled && udc->vbus) { 228 proc_ep_show(s, &udc->ep[0]); 229 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { 230 if (ep->ep.desc) 231 proc_ep_show(s, ep); 232 } 233 } 234 return 0; 235} 236 237static void create_debug_file(struct at91_udc *udc) 238{ 239 udc->pde = proc_create_single_data(debug_filename, 0, NULL, 240 proc_udc_show, udc); 241} 242 243static void remove_debug_file(struct at91_udc *udc) 244{ 245 if (udc->pde) 246 remove_proc_entry(debug_filename, NULL); 247} 248 249#else 250 251static inline void create_debug_file(struct at91_udc *udc) {} 252static inline void remove_debug_file(struct at91_udc *udc) {} 253 254#endif 255 256 257/*-------------------------------------------------------------------------*/ 258 259static void done(struct at91_ep *ep, struct at91_request *req, int status) 260{ 261 unsigned stopped = ep->stopped; 262 struct at91_udc *udc = ep->udc; 263 264 list_del_init(&req->queue); 265 if (req->req.status == -EINPROGRESS) 266 req->req.status = status; 267 else 268 status = req->req.status; 269 if (status && status != -ESHUTDOWN) 270 VDBG("%s done %p, status %d\n", ep->ep.name, req, status); 271 272 ep->stopped = 1; 273 spin_unlock(&udc->lock); 274 usb_gadget_giveback_request(&ep->ep, &req->req); 275 spin_lock(&udc->lock); 276 ep->stopped = stopped; 277 278 /* ep0 is always ready; other endpoints need a non-empty queue */ 279 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) 280 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask); 281} 282 283/*-------------------------------------------------------------------------*/ 284 285/* bits indicating OUT fifo has data ready */ 286#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) 287 288/* 289 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write 290 * back most of the value you just read (because of side effects, including 291 * bits that may change after reading and before writing). 292 * 293 * Except when changing a specific bit, always write values which: 294 * - clear SET_FX bits (setting them could change something) 295 * - set CLR_FX bits (clearing them could change something) 296 * 297 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE 298 * that shouldn't normally be changed. 299 * 300 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, 301 * implying a need to wait for one write to complete (test relevant bits) 302 * before starting the next write. This shouldn't be an issue given how 303 * infrequently we write, except maybe for write-then-read idioms. 304 */ 305#define SET_FX (AT91_UDP_TXPKTRDY) 306#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ 307 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) 308 309/* pull OUT packet data from the endpoint's fifo */ 310static int read_fifo (struct at91_ep *ep, struct at91_request *req) 311{ 312 u32 __iomem *creg = ep->creg; 313 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 314 u32 csr; 315 u8 *buf; 316 unsigned int count, bufferspace, is_done; 317 318 buf = req->req.buf + req->req.actual; 319 bufferspace = req->req.length - req->req.actual; 320 321 /* 322 * there might be nothing to read if ep_queue() calls us, 323 * or if we already emptied both pingpong buffers 324 */ 325rescan: 326 csr = __raw_readl(creg); 327 if ((csr & RX_DATA_READY) == 0) 328 return 0; 329 330 count = (csr & AT91_UDP_RXBYTECNT) >> 16; 331 if (count > ep->ep.maxpacket) 332 count = ep->ep.maxpacket; 333 if (count > bufferspace) { 334 DBG("%s buffer overflow\n", ep->ep.name); 335 req->req.status = -EOVERFLOW; 336 count = bufferspace; 337 } 338 __raw_readsb(dreg, buf, count); 339 340 /* release and swap pingpong mem bank */ 341 csr |= CLR_FX; 342 if (ep->is_pingpong) { 343 if (ep->fifo_bank == 0) { 344 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 345 ep->fifo_bank = 1; 346 } else { 347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); 348 ep->fifo_bank = 0; 349 } 350 } else 351 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 352 __raw_writel(csr, creg); 353 354 req->req.actual += count; 355 is_done = (count < ep->ep.maxpacket); 356 if (count == bufferspace) 357 is_done = 1; 358 359 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, 360 is_done ? " (done)" : ""); 361 362 /* 363 * avoid extra trips through IRQ logic for packets already in 364 * the fifo ... maybe preventing an extra (expensive) OUT-NAK 365 */ 366 if (is_done) 367 done(ep, req, 0); 368 else if (ep->is_pingpong) { 369 /* 370 * One dummy read to delay the code because of a HW glitch: 371 * CSR returns bad RXCOUNT when read too soon after updating 372 * RX_DATA_BK flags. 373 */ 374 csr = __raw_readl(creg); 375 376 bufferspace -= count; 377 buf += count; 378 goto rescan; 379 } 380 381 return is_done; 382} 383 384/* load fifo for an IN packet */ 385static int write_fifo(struct at91_ep *ep, struct at91_request *req) 386{ 387 u32 __iomem *creg = ep->creg; 388 u32 csr = __raw_readl(creg); 389 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 390 unsigned total, count, is_last; 391 u8 *buf; 392 393 /* 394 * TODO: allow for writing two packets to the fifo ... that'll 395 * reduce the amount of IN-NAKing, but probably won't affect 396 * throughput much. (Unlike preventing OUT-NAKing!) 397 */ 398 399 /* 400 * If ep_queue() calls us, the queue is empty and possibly in 401 * odd states like TXCOMP not yet cleared (we do it, saving at 402 * least one IRQ) or the fifo not yet being free. Those aren't 403 * issues normally (IRQ handler fast path). 404 */ 405 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { 406 if (csr & AT91_UDP_TXCOMP) { 407 csr |= CLR_FX; 408 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 409 __raw_writel(csr, creg); 410 csr = __raw_readl(creg); 411 } 412 if (csr & AT91_UDP_TXPKTRDY) 413 return 0; 414 } 415 416 buf = req->req.buf + req->req.actual; 417 prefetch(buf); 418 total = req->req.length - req->req.actual; 419 if (ep->ep.maxpacket < total) { 420 count = ep->ep.maxpacket; 421 is_last = 0; 422 } else { 423 count = total; 424 is_last = (count < ep->ep.maxpacket) || !req->req.zero; 425 } 426 427 /* 428 * Write the packet, maybe it's a ZLP. 429 * 430 * NOTE: incrementing req->actual before we receive the ACK means 431 * gadget driver IN bytecounts can be wrong in fault cases. That's 432 * fixable with PIO drivers like this one (save "count" here, and 433 * do the increment later on TX irq), but not for most DMA hardware. 434 * 435 * So all gadget drivers must accept that potential error. Some 436 * hardware supports precise fifo status reporting, letting them 437 * recover when the actual bytecount matters (e.g. for USB Test 438 * and Measurement Class devices). 439 */ 440 __raw_writesb(dreg, buf, count); 441 csr &= ~SET_FX; 442 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 443 __raw_writel(csr, creg); 444 req->req.actual += count; 445 446 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, 447 is_last ? " (done)" : ""); 448 if (is_last) 449 done(ep, req, 0); 450 return is_last; 451} 452 453static void nuke(struct at91_ep *ep, int status) 454{ 455 struct at91_request *req; 456 457 /* terminate any request in the queue */ 458 ep->stopped = 1; 459 if (list_empty(&ep->queue)) 460 return; 461 462 VDBG("%s %s\n", __func__, ep->ep.name); 463 while (!list_empty(&ep->queue)) { 464 req = list_entry(ep->queue.next, struct at91_request, queue); 465 done(ep, req, status); 466 } 467} 468 469/*-------------------------------------------------------------------------*/ 470 471static int at91_ep_enable(struct usb_ep *_ep, 472 const struct usb_endpoint_descriptor *desc) 473{ 474 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 475 struct at91_udc *udc; 476 u16 maxpacket; 477 u32 tmp; 478 unsigned long flags; 479 480 if (!_ep || !ep 481 || !desc || _ep->name == ep0name 482 || desc->bDescriptorType != USB_DT_ENDPOINT 483 || (maxpacket = usb_endpoint_maxp(desc)) == 0 484 || maxpacket > ep->maxpacket) { 485 DBG("bad ep or descriptor\n"); 486 return -EINVAL; 487 } 488 489 udc = ep->udc; 490 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 491 DBG("bogus device state\n"); 492 return -ESHUTDOWN; 493 } 494 495 tmp = usb_endpoint_type(desc); 496 switch (tmp) { 497 case USB_ENDPOINT_XFER_CONTROL: 498 DBG("only one control endpoint\n"); 499 return -EINVAL; 500 case USB_ENDPOINT_XFER_INT: 501 if (maxpacket > 64) 502 goto bogus_max; 503 break; 504 case USB_ENDPOINT_XFER_BULK: 505 switch (maxpacket) { 506 case 8: 507 case 16: 508 case 32: 509 case 64: 510 goto ok; 511 } 512bogus_max: 513 DBG("bogus maxpacket %d\n", maxpacket); 514 return -EINVAL; 515 case USB_ENDPOINT_XFER_ISOC: 516 if (!ep->is_pingpong) { 517 DBG("iso requires double buffering\n"); 518 return -EINVAL; 519 } 520 break; 521 } 522 523ok: 524 spin_lock_irqsave(&udc->lock, flags); 525 526 /* initialize endpoint to match this descriptor */ 527 ep->is_in = usb_endpoint_dir_in(desc); 528 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); 529 ep->stopped = 0; 530 if (ep->is_in) 531 tmp |= 0x04; 532 tmp <<= 8; 533 tmp |= AT91_UDP_EPEDS; 534 __raw_writel(tmp, ep->creg); 535 536 ep->ep.maxpacket = maxpacket; 537 538 /* 539 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, 540 * since endpoint resets don't reset hw pingpong state. 541 */ 542 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 543 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 544 545 spin_unlock_irqrestore(&udc->lock, flags); 546 return 0; 547} 548 549static int at91_ep_disable (struct usb_ep * _ep) 550{ 551 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 552 struct at91_udc *udc = ep->udc; 553 unsigned long flags; 554 555 if (ep == &ep->udc->ep[0]) 556 return -EINVAL; 557 558 spin_lock_irqsave(&udc->lock, flags); 559 560 nuke(ep, -ESHUTDOWN); 561 562 /* restore the endpoint's pristine config */ 563 ep->ep.desc = NULL; 564 ep->ep.maxpacket = ep->maxpacket; 565 566 /* reset fifos and endpoint */ 567 if (ep->udc->clocked) { 568 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 569 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 570 __raw_writel(0, ep->creg); 571 } 572 573 spin_unlock_irqrestore(&udc->lock, flags); 574 return 0; 575} 576 577/* 578 * this is a PIO-only driver, so there's nothing 579 * interesting for request or buffer allocation. 580 */ 581 582static struct usb_request * 583at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 584{ 585 struct at91_request *req; 586 587 req = kzalloc(sizeof (struct at91_request), gfp_flags); 588 if (!req) 589 return NULL; 590 591 INIT_LIST_HEAD(&req->queue); 592 return &req->req; 593} 594 595static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) 596{ 597 struct at91_request *req; 598 599 req = container_of(_req, struct at91_request, req); 600 BUG_ON(!list_empty(&req->queue)); 601 kfree(req); 602} 603 604static int at91_ep_queue(struct usb_ep *_ep, 605 struct usb_request *_req, gfp_t gfp_flags) 606{ 607 struct at91_request *req; 608 struct at91_ep *ep; 609 struct at91_udc *udc; 610 int status; 611 unsigned long flags; 612 613 req = container_of(_req, struct at91_request, req); 614 ep = container_of(_ep, struct at91_ep, ep); 615 616 if (!_req || !_req->complete 617 || !_req->buf || !list_empty(&req->queue)) { 618 DBG("invalid request\n"); 619 return -EINVAL; 620 } 621 622 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) { 623 DBG("invalid ep\n"); 624 return -EINVAL; 625 } 626 627 udc = ep->udc; 628 629 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 630 DBG("invalid device\n"); 631 return -EINVAL; 632 } 633 634 _req->status = -EINPROGRESS; 635 _req->actual = 0; 636 637 spin_lock_irqsave(&udc->lock, flags); 638 639 /* try to kickstart any empty and idle queue */ 640 if (list_empty(&ep->queue) && !ep->stopped) { 641 int is_ep0; 642 643 /* 644 * If this control request has a non-empty DATA stage, this 645 * will start that stage. It works just like a non-control 646 * request (until the status stage starts, maybe early). 647 * 648 * If the data stage is empty, then this starts a successful 649 * IN/STATUS stage. (Unsuccessful ones use set_halt.) 650 */ 651 is_ep0 = (ep->ep.name == ep0name); 652 if (is_ep0) { 653 u32 tmp; 654 655 if (!udc->req_pending) { 656 status = -EINVAL; 657 goto done; 658 } 659 660 /* 661 * defer changing CONFG until after the gadget driver 662 * reconfigures the endpoints. 663 */ 664 if (udc->wait_for_config_ack) { 665 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 666 tmp ^= AT91_UDP_CONFG; 667 VDBG("toggle config\n"); 668 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 669 } 670 if (req->req.length == 0) { 671ep0_in_status: 672 PACKET("ep0 in/status\n"); 673 status = 0; 674 tmp = __raw_readl(ep->creg); 675 tmp &= ~SET_FX; 676 tmp |= CLR_FX | AT91_UDP_TXPKTRDY; 677 __raw_writel(tmp, ep->creg); 678 udc->req_pending = 0; 679 goto done; 680 } 681 } 682 683 if (ep->is_in) 684 status = write_fifo(ep, req); 685 else { 686 status = read_fifo(ep, req); 687 688 /* IN/STATUS stage is otherwise triggered by irq */ 689 if (status && is_ep0) 690 goto ep0_in_status; 691 } 692 } else 693 status = 0; 694 695 if (req && !status) { 696 list_add_tail (&req->queue, &ep->queue); 697 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask); 698 } 699done: 700 spin_unlock_irqrestore(&udc->lock, flags); 701 return (status < 0) ? status : 0; 702} 703 704static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 705{ 706 struct at91_ep *ep; 707 struct at91_request *req; 708 unsigned long flags; 709 struct at91_udc *udc; 710 711 ep = container_of(_ep, struct at91_ep, ep); 712 if (!_ep || ep->ep.name == ep0name) 713 return -EINVAL; 714 715 udc = ep->udc; 716 717 spin_lock_irqsave(&udc->lock, flags); 718 719 /* make sure it's actually queued on this endpoint */ 720 list_for_each_entry (req, &ep->queue, queue) { 721 if (&req->req == _req) 722 break; 723 } 724 if (&req->req != _req) { 725 spin_unlock_irqrestore(&udc->lock, flags); 726 return -EINVAL; 727 } 728 729 done(ep, req, -ECONNRESET); 730 spin_unlock_irqrestore(&udc->lock, flags); 731 return 0; 732} 733 734static int at91_ep_set_halt(struct usb_ep *_ep, int value) 735{ 736 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 737 struct at91_udc *udc = ep->udc; 738 u32 __iomem *creg; 739 u32 csr; 740 unsigned long flags; 741 int status = 0; 742 743 if (!_ep || ep->is_iso || !ep->udc->clocked) 744 return -EINVAL; 745 746 creg = ep->creg; 747 spin_lock_irqsave(&udc->lock, flags); 748 749 csr = __raw_readl(creg); 750 751 /* 752 * fail with still-busy IN endpoints, ensuring correct sequencing 753 * of data tx then stall. note that the fifo rx bytecount isn't 754 * completely accurate as a tx bytecount. 755 */ 756 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) 757 status = -EAGAIN; 758 else { 759 csr |= CLR_FX; 760 csr &= ~SET_FX; 761 if (value) { 762 csr |= AT91_UDP_FORCESTALL; 763 VDBG("halt %s\n", ep->ep.name); 764 } else { 765 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 766 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 767 csr &= ~AT91_UDP_FORCESTALL; 768 } 769 __raw_writel(csr, creg); 770 } 771 772 spin_unlock_irqrestore(&udc->lock, flags); 773 return status; 774} 775 776static const struct usb_ep_ops at91_ep_ops = { 777 .enable = at91_ep_enable, 778 .disable = at91_ep_disable, 779 .alloc_request = at91_ep_alloc_request, 780 .free_request = at91_ep_free_request, 781 .queue = at91_ep_queue, 782 .dequeue = at91_ep_dequeue, 783 .set_halt = at91_ep_set_halt, 784 /* there's only imprecise fifo status reporting */ 785}; 786 787/*-------------------------------------------------------------------------*/ 788 789static int at91_get_frame(struct usb_gadget *gadget) 790{ 791 struct at91_udc *udc = to_udc(gadget); 792 793 if (!to_udc(gadget)->clocked) 794 return -EINVAL; 795 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; 796} 797 798static int at91_wakeup(struct usb_gadget *gadget) 799{ 800 struct at91_udc *udc = to_udc(gadget); 801 u32 glbstate; 802 unsigned long flags; 803 804 DBG("%s\n", __func__ ); 805 spin_lock_irqsave(&udc->lock, flags); 806 807 if (!udc->clocked || !udc->suspended) 808 goto done; 809 810 /* NOTE: some "early versions" handle ESR differently ... */ 811 812 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); 813 if (!(glbstate & AT91_UDP_ESR)) 814 goto done; 815 glbstate |= AT91_UDP_ESR; 816 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); 817 818done: 819 spin_unlock_irqrestore(&udc->lock, flags); 820 return 0; 821} 822 823/* reinit == restore initial software state */ 824static void udc_reinit(struct at91_udc *udc) 825{ 826 u32 i; 827 828 INIT_LIST_HEAD(&udc->gadget.ep_list); 829 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); 830 udc->gadget.quirk_stall_not_supp = 1; 831 832 for (i = 0; i < NUM_ENDPOINTS; i++) { 833 struct at91_ep *ep = &udc->ep[i]; 834 835 if (i != 0) 836 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 837 ep->ep.desc = NULL; 838 ep->stopped = 0; 839 ep->fifo_bank = 0; 840 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 841 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); 842 /* initialize one queue per endpoint */ 843 INIT_LIST_HEAD(&ep->queue); 844 } 845} 846 847static void reset_gadget(struct at91_udc *udc) 848{ 849 struct usb_gadget_driver *driver = udc->driver; 850 int i; 851 852 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 853 driver = NULL; 854 udc->gadget.speed = USB_SPEED_UNKNOWN; 855 udc->suspended = 0; 856 857 for (i = 0; i < NUM_ENDPOINTS; i++) { 858 struct at91_ep *ep = &udc->ep[i]; 859 860 ep->stopped = 1; 861 nuke(ep, -ESHUTDOWN); 862 } 863 if (driver) { 864 spin_unlock(&udc->lock); 865 usb_gadget_udc_reset(&udc->gadget, driver); 866 spin_lock(&udc->lock); 867 } 868 869 udc_reinit(udc); 870} 871 872static void stop_activity(struct at91_udc *udc) 873{ 874 struct usb_gadget_driver *driver = udc->driver; 875 int i; 876 877 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 878 driver = NULL; 879 udc->gadget.speed = USB_SPEED_UNKNOWN; 880 udc->suspended = 0; 881 882 for (i = 0; i < NUM_ENDPOINTS; i++) { 883 struct at91_ep *ep = &udc->ep[i]; 884 ep->stopped = 1; 885 nuke(ep, -ESHUTDOWN); 886 } 887 if (driver) { 888 spin_unlock(&udc->lock); 889 driver->disconnect(&udc->gadget); 890 spin_lock(&udc->lock); 891 } 892 893 udc_reinit(udc); 894} 895 896static void clk_on(struct at91_udc *udc) 897{ 898 if (udc->clocked) 899 return; 900 udc->clocked = 1; 901 902 clk_enable(udc->iclk); 903 clk_enable(udc->fclk); 904} 905 906static void clk_off(struct at91_udc *udc) 907{ 908 if (!udc->clocked) 909 return; 910 udc->clocked = 0; 911 udc->gadget.speed = USB_SPEED_UNKNOWN; 912 clk_disable(udc->fclk); 913 clk_disable(udc->iclk); 914} 915 916/* 917 * activate/deactivate link with host; minimize power usage for 918 * inactive links by cutting clocks and transceiver power. 919 */ 920static void pullup(struct at91_udc *udc, int is_on) 921{ 922 if (!udc->enabled || !udc->vbus) 923 is_on = 0; 924 DBG("%sactive\n", is_on ? "" : "in"); 925 926 if (is_on) { 927 clk_on(udc); 928 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 929 at91_udp_write(udc, AT91_UDP_TXVC, 0); 930 } else { 931 stop_activity(udc); 932 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 933 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 934 clk_off(udc); 935 } 936 937 if (udc->caps && udc->caps->pullup) 938 udc->caps->pullup(udc, is_on); 939} 940 941/* vbus is here! turn everything on that's ready */ 942static int at91_vbus_session(struct usb_gadget *gadget, int is_active) 943{ 944 struct at91_udc *udc = to_udc(gadget); 945 unsigned long flags; 946 947 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ 948 spin_lock_irqsave(&udc->lock, flags); 949 udc->vbus = (is_active != 0); 950 if (udc->driver) 951 pullup(udc, is_active); 952 else 953 pullup(udc, 0); 954 spin_unlock_irqrestore(&udc->lock, flags); 955 return 0; 956} 957 958static int at91_pullup(struct usb_gadget *gadget, int is_on) 959{ 960 struct at91_udc *udc = to_udc(gadget); 961 unsigned long flags; 962 963 spin_lock_irqsave(&udc->lock, flags); 964 udc->enabled = is_on = !!is_on; 965 pullup(udc, is_on); 966 spin_unlock_irqrestore(&udc->lock, flags); 967 return 0; 968} 969 970static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) 971{ 972 struct at91_udc *udc = to_udc(gadget); 973 unsigned long flags; 974 975 spin_lock_irqsave(&udc->lock, flags); 976 gadget->is_selfpowered = (is_on != 0); 977 spin_unlock_irqrestore(&udc->lock, flags); 978 return 0; 979} 980 981static int at91_start(struct usb_gadget *gadget, 982 struct usb_gadget_driver *driver); 983static int at91_stop(struct usb_gadget *gadget); 984 985static const struct usb_gadget_ops at91_udc_ops = { 986 .get_frame = at91_get_frame, 987 .wakeup = at91_wakeup, 988 .set_selfpowered = at91_set_selfpowered, 989 .vbus_session = at91_vbus_session, 990 .pullup = at91_pullup, 991 .udc_start = at91_start, 992 .udc_stop = at91_stop, 993 994 /* 995 * VBUS-powered devices may also also want to support bigger 996 * power budgets after an appropriate SET_CONFIGURATION. 997 */ 998 /* .vbus_power = at91_vbus_power, */ 999}; 1000 1001/*-------------------------------------------------------------------------*/ 1002 1003static int handle_ep(struct at91_ep *ep) 1004{ 1005 struct at91_request *req; 1006 u32 __iomem *creg = ep->creg; 1007 u32 csr = __raw_readl(creg); 1008 1009 if (!list_empty(&ep->queue)) 1010 req = list_entry(ep->queue.next, 1011 struct at91_request, queue); 1012 else 1013 req = NULL; 1014 1015 if (ep->is_in) { 1016 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { 1017 csr |= CLR_FX; 1018 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); 1019 __raw_writel(csr, creg); 1020 } 1021 if (req) 1022 return write_fifo(ep, req); 1023 1024 } else { 1025 if (csr & AT91_UDP_STALLSENT) { 1026 /* STALLSENT bit == ISOERR */ 1027 if (ep->is_iso && req) 1028 req->req.status = -EILSEQ; 1029 csr |= CLR_FX; 1030 csr &= ~(SET_FX | AT91_UDP_STALLSENT); 1031 __raw_writel(csr, creg); 1032 csr = __raw_readl(creg); 1033 } 1034 if (req && (csr & RX_DATA_READY)) 1035 return read_fifo(ep, req); 1036 } 1037 return 0; 1038} 1039 1040union setup { 1041 u8 raw[8]; 1042 struct usb_ctrlrequest r; 1043}; 1044 1045static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) 1046{ 1047 u32 __iomem *creg = ep->creg; 1048 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 1049 unsigned rxcount, i = 0; 1050 u32 tmp; 1051 union setup pkt; 1052 int status = 0; 1053 1054 /* read and ack SETUP; hard-fail for bogus packets */ 1055 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; 1056 if (likely(rxcount == 8)) { 1057 while (rxcount--) 1058 pkt.raw[i++] = __raw_readb(dreg); 1059 if (pkt.r.bRequestType & USB_DIR_IN) { 1060 csr |= AT91_UDP_DIR; 1061 ep->is_in = 1; 1062 } else { 1063 csr &= ~AT91_UDP_DIR; 1064 ep->is_in = 0; 1065 } 1066 } else { 1067 /* REVISIT this happens sometimes under load; why?? */ 1068 ERR("SETUP len %d, csr %08x\n", rxcount, csr); 1069 status = -EINVAL; 1070 } 1071 csr |= CLR_FX; 1072 csr &= ~(SET_FX | AT91_UDP_RXSETUP); 1073 __raw_writel(csr, creg); 1074 udc->wait_for_addr_ack = 0; 1075 udc->wait_for_config_ack = 0; 1076 ep->stopped = 0; 1077 if (unlikely(status != 0)) 1078 goto stall; 1079 1080#define w_index le16_to_cpu(pkt.r.wIndex) 1081#define w_value le16_to_cpu(pkt.r.wValue) 1082#define w_length le16_to_cpu(pkt.r.wLength) 1083 1084 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 1085 pkt.r.bRequestType, pkt.r.bRequest, 1086 w_value, w_index, w_length); 1087 1088 /* 1089 * A few standard requests get handled here, ones that touch 1090 * hardware ... notably for device and endpoint features. 1091 */ 1092 udc->req_pending = 1; 1093 csr = __raw_readl(creg); 1094 csr |= CLR_FX; 1095 csr &= ~SET_FX; 1096 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { 1097 1098 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1099 | USB_REQ_SET_ADDRESS: 1100 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); 1101 udc->addr = w_value; 1102 udc->wait_for_addr_ack = 1; 1103 udc->req_pending = 0; 1104 /* FADDR is set later, when we ack host STATUS */ 1105 return; 1106 1107 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1108 | USB_REQ_SET_CONFIGURATION: 1109 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; 1110 if (pkt.r.wValue) 1111 udc->wait_for_config_ack = (tmp == 0); 1112 else 1113 udc->wait_for_config_ack = (tmp != 0); 1114 if (udc->wait_for_config_ack) 1115 VDBG("wait for config\n"); 1116 /* CONFG is toggled later, if gadget driver succeeds */ 1117 break; 1118 1119 /* 1120 * Hosts may set or clear remote wakeup status, and 1121 * devices may report they're VBUS powered. 1122 */ 1123 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1124 | USB_REQ_GET_STATUS: 1125 tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED); 1126 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) 1127 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); 1128 PACKET("get device status\n"); 1129 __raw_writeb(tmp, dreg); 1130 __raw_writeb(0, dreg); 1131 goto write_in; 1132 /* then STATUS starts later, automatically */ 1133 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1134 | USB_REQ_SET_FEATURE: 1135 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1136 goto stall; 1137 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1138 tmp |= AT91_UDP_ESR; 1139 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1140 goto succeed; 1141 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1142 | USB_REQ_CLEAR_FEATURE: 1143 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1144 goto stall; 1145 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1146 tmp &= ~AT91_UDP_ESR; 1147 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1148 goto succeed; 1149 1150 /* 1151 * Interfaces have no feature settings; this is pretty useless. 1152 * we won't even insist the interface exists... 1153 */ 1154 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1155 | USB_REQ_GET_STATUS: 1156 PACKET("get interface status\n"); 1157 __raw_writeb(0, dreg); 1158 __raw_writeb(0, dreg); 1159 goto write_in; 1160 /* then STATUS starts later, automatically */ 1161 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1162 | USB_REQ_SET_FEATURE: 1163 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1164 | USB_REQ_CLEAR_FEATURE: 1165 goto stall; 1166 1167 /* 1168 * Hosts may clear bulk/intr endpoint halt after the gadget 1169 * driver sets it (not widely used); or set it (for testing) 1170 */ 1171 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1172 | USB_REQ_GET_STATUS: 1173 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1174 ep = &udc->ep[tmp]; 1175 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc)) 1176 goto stall; 1177 1178 if (tmp) { 1179 if ((w_index & USB_DIR_IN)) { 1180 if (!ep->is_in) 1181 goto stall; 1182 } else if (ep->is_in) 1183 goto stall; 1184 } 1185 PACKET("get %s status\n", ep->ep.name); 1186 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) 1187 tmp = (1 << USB_ENDPOINT_HALT); 1188 else 1189 tmp = 0; 1190 __raw_writeb(tmp, dreg); 1191 __raw_writeb(0, dreg); 1192 goto write_in; 1193 /* then STATUS starts later, automatically */ 1194 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1195 | USB_REQ_SET_FEATURE: 1196 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1197 ep = &udc->ep[tmp]; 1198 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1199 goto stall; 1200 if (!ep->ep.desc || ep->is_iso) 1201 goto stall; 1202 if ((w_index & USB_DIR_IN)) { 1203 if (!ep->is_in) 1204 goto stall; 1205 } else if (ep->is_in) 1206 goto stall; 1207 1208 tmp = __raw_readl(ep->creg); 1209 tmp &= ~SET_FX; 1210 tmp |= CLR_FX | AT91_UDP_FORCESTALL; 1211 __raw_writel(tmp, ep->creg); 1212 goto succeed; 1213 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1214 | USB_REQ_CLEAR_FEATURE: 1215 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1216 ep = &udc->ep[tmp]; 1217 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1218 goto stall; 1219 if (tmp == 0) 1220 goto succeed; 1221 if (!ep->ep.desc || ep->is_iso) 1222 goto stall; 1223 if ((w_index & USB_DIR_IN)) { 1224 if (!ep->is_in) 1225 goto stall; 1226 } else if (ep->is_in) 1227 goto stall; 1228 1229 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 1230 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 1231 tmp = __raw_readl(ep->creg); 1232 tmp |= CLR_FX; 1233 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); 1234 __raw_writel(tmp, ep->creg); 1235 if (!list_empty(&ep->queue)) 1236 handle_ep(ep); 1237 goto succeed; 1238 } 1239 1240#undef w_value 1241#undef w_index 1242#undef w_length 1243 1244 /* pass request up to the gadget driver */ 1245 if (udc->driver) { 1246 spin_unlock(&udc->lock); 1247 status = udc->driver->setup(&udc->gadget, &pkt.r); 1248 spin_lock(&udc->lock); 1249 } 1250 else 1251 status = -ENODEV; 1252 if (status < 0) { 1253stall: 1254 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1255 pkt.r.bRequestType, pkt.r.bRequest, status); 1256 csr |= AT91_UDP_FORCESTALL; 1257 __raw_writel(csr, creg); 1258 udc->req_pending = 0; 1259 } 1260 return; 1261 1262succeed: 1263 /* immediate successful (IN) STATUS after zero length DATA */ 1264 PACKET("ep0 in/status\n"); 1265write_in: 1266 csr |= AT91_UDP_TXPKTRDY; 1267 __raw_writel(csr, creg); 1268 udc->req_pending = 0; 1269} 1270 1271static void handle_ep0(struct at91_udc *udc) 1272{ 1273 struct at91_ep *ep0 = &udc->ep[0]; 1274 u32 __iomem *creg = ep0->creg; 1275 u32 csr = __raw_readl(creg); 1276 struct at91_request *req; 1277 1278 if (unlikely(csr & AT91_UDP_STALLSENT)) { 1279 nuke(ep0, -EPROTO); 1280 udc->req_pending = 0; 1281 csr |= CLR_FX; 1282 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); 1283 __raw_writel(csr, creg); 1284 VDBG("ep0 stalled\n"); 1285 csr = __raw_readl(creg); 1286 } 1287 if (csr & AT91_UDP_RXSETUP) { 1288 nuke(ep0, 0); 1289 udc->req_pending = 0; 1290 handle_setup(udc, ep0, csr); 1291 return; 1292 } 1293 1294 if (list_empty(&ep0->queue)) 1295 req = NULL; 1296 else 1297 req = list_entry(ep0->queue.next, struct at91_request, queue); 1298 1299 /* host ACKed an IN packet that we sent */ 1300 if (csr & AT91_UDP_TXCOMP) { 1301 csr |= CLR_FX; 1302 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 1303 1304 /* write more IN DATA? */ 1305 if (req && ep0->is_in) { 1306 if (handle_ep(ep0)) 1307 udc->req_pending = 0; 1308 1309 /* 1310 * Ack after: 1311 * - last IN DATA packet (including GET_STATUS) 1312 * - IN/STATUS for OUT DATA 1313 * - IN/STATUS for any zero-length DATA stage 1314 * except for the IN DATA case, the host should send 1315 * an OUT status later, which we'll ack. 1316 */ 1317 } else { 1318 udc->req_pending = 0; 1319 __raw_writel(csr, creg); 1320 1321 /* 1322 * SET_ADDRESS takes effect only after the STATUS 1323 * (to the original address) gets acked. 1324 */ 1325 if (udc->wait_for_addr_ack) { 1326 u32 tmp; 1327 1328 at91_udp_write(udc, AT91_UDP_FADDR, 1329 AT91_UDP_FEN | udc->addr); 1330 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1331 tmp &= ~AT91_UDP_FADDEN; 1332 if (udc->addr) 1333 tmp |= AT91_UDP_FADDEN; 1334 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1335 1336 udc->wait_for_addr_ack = 0; 1337 VDBG("address %d\n", udc->addr); 1338 } 1339 } 1340 } 1341 1342 /* OUT packet arrived ... */ 1343 else if (csr & AT91_UDP_RX_DATA_BK0) { 1344 csr |= CLR_FX; 1345 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 1346 1347 /* OUT DATA stage */ 1348 if (!ep0->is_in) { 1349 if (req) { 1350 if (handle_ep(ep0)) { 1351 /* send IN/STATUS */ 1352 PACKET("ep0 in/status\n"); 1353 csr = __raw_readl(creg); 1354 csr &= ~SET_FX; 1355 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 1356 __raw_writel(csr, creg); 1357 udc->req_pending = 0; 1358 } 1359 } else if (udc->req_pending) { 1360 /* 1361 * AT91 hardware has a hard time with this 1362 * "deferred response" mode for control-OUT 1363 * transfers. (For control-IN it's fine.) 1364 * 1365 * The normal solution leaves OUT data in the 1366 * fifo until the gadget driver is ready. 1367 * We couldn't do that here without disabling 1368 * the IRQ that tells about SETUP packets, 1369 * e.g. when the host gets impatient... 1370 * 1371 * Working around it by copying into a buffer 1372 * would almost be a non-deferred response, 1373 * except that it wouldn't permit reliable 1374 * stalling of the request. Instead, demand 1375 * that gadget drivers not use this mode. 1376 */ 1377 DBG("no control-OUT deferred responses!\n"); 1378 __raw_writel(csr | AT91_UDP_FORCESTALL, creg); 1379 udc->req_pending = 0; 1380 } 1381 1382 /* STATUS stage for control-IN; ack. */ 1383 } else { 1384 PACKET("ep0 out/status ACK\n"); 1385 __raw_writel(csr, creg); 1386 1387 /* "early" status stage */ 1388 if (req) 1389 done(ep0, req, 0); 1390 } 1391 } 1392} 1393 1394static irqreturn_t at91_udc_irq (int irq, void *_udc) 1395{ 1396 struct at91_udc *udc = _udc; 1397 u32 rescans = 5; 1398 int disable_clock = 0; 1399 unsigned long flags; 1400 1401 spin_lock_irqsave(&udc->lock, flags); 1402 1403 if (!udc->clocked) { 1404 clk_on(udc); 1405 disable_clock = 1; 1406 } 1407 1408 while (rescans--) { 1409 u32 status; 1410 1411 status = at91_udp_read(udc, AT91_UDP_ISR) 1412 & at91_udp_read(udc, AT91_UDP_IMR); 1413 if (!status) 1414 break; 1415 1416 /* USB reset irq: not maskable */ 1417 if (status & AT91_UDP_ENDBUSRES) { 1418 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); 1419 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS); 1420 /* Atmel code clears this irq twice */ 1421 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1422 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1423 VDBG("end bus reset\n"); 1424 udc->addr = 0; 1425 reset_gadget(udc); 1426 1427 /* enable ep0 */ 1428 at91_udp_write(udc, AT91_UDP_CSR(0), 1429 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); 1430 udc->gadget.speed = USB_SPEED_FULL; 1431 udc->suspended = 0; 1432 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0)); 1433 1434 /* 1435 * NOTE: this driver keeps clocks off unless the 1436 * USB host is present. That saves power, but for 1437 * boards that don't support VBUS detection, both 1438 * clocks need to be active most of the time. 1439 */ 1440 1441 /* host initiated suspend (3+ms bus idle) */ 1442 } else if (status & AT91_UDP_RXSUSP) { 1443 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); 1444 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); 1445 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); 1446 /* VDBG("bus suspend\n"); */ 1447 if (udc->suspended) 1448 continue; 1449 udc->suspended = 1; 1450 1451 /* 1452 * NOTE: when suspending a VBUS-powered device, the 1453 * gadget driver should switch into slow clock mode 1454 * and then into standby to avoid drawing more than 1455 * 500uA power (2500uA for some high-power configs). 1456 */ 1457 if (udc->driver && udc->driver->suspend) { 1458 spin_unlock(&udc->lock); 1459 udc->driver->suspend(&udc->gadget); 1460 spin_lock(&udc->lock); 1461 } 1462 1463 /* host initiated resume */ 1464 } else if (status & AT91_UDP_RXRSM) { 1465 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 1466 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP); 1467 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 1468 /* VDBG("bus resume\n"); */ 1469 if (!udc->suspended) 1470 continue; 1471 udc->suspended = 0; 1472 1473 /* 1474 * NOTE: for a VBUS-powered device, the gadget driver 1475 * would normally want to switch out of slow clock 1476 * mode into normal mode. 1477 */ 1478 if (udc->driver && udc->driver->resume) { 1479 spin_unlock(&udc->lock); 1480 udc->driver->resume(&udc->gadget); 1481 spin_lock(&udc->lock); 1482 } 1483 1484 /* endpoint IRQs are cleared by handling them */ 1485 } else { 1486 int i; 1487 unsigned mask = 1; 1488 struct at91_ep *ep = &udc->ep[1]; 1489 1490 if (status & mask) 1491 handle_ep0(udc); 1492 for (i = 1; i < NUM_ENDPOINTS; i++) { 1493 mask <<= 1; 1494 if (status & mask) 1495 handle_ep(ep); 1496 ep++; 1497 } 1498 } 1499 } 1500 1501 if (disable_clock) 1502 clk_off(udc); 1503 1504 spin_unlock_irqrestore(&udc->lock, flags); 1505 1506 return IRQ_HANDLED; 1507} 1508 1509/*-------------------------------------------------------------------------*/ 1510 1511static void at91_vbus_update(struct at91_udc *udc, unsigned value) 1512{ 1513 value ^= udc->board.vbus_active_low; 1514 if (value != udc->vbus) 1515 at91_vbus_session(&udc->gadget, value); 1516} 1517 1518static irqreturn_t at91_vbus_irq(int irq, void *_udc) 1519{ 1520 struct at91_udc *udc = _udc; 1521 1522 /* vbus needs at least brief debouncing */ 1523 udelay(10); 1524 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin)); 1525 1526 return IRQ_HANDLED; 1527} 1528 1529static void at91_vbus_timer_work(struct work_struct *work) 1530{ 1531 struct at91_udc *udc = container_of(work, struct at91_udc, 1532 vbus_timer_work); 1533 1534 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin)); 1535 1536 if (!timer_pending(&udc->vbus_timer)) 1537 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT); 1538} 1539 1540static void at91_vbus_timer(struct timer_list *t) 1541{ 1542 struct at91_udc *udc = from_timer(udc, t, vbus_timer); 1543 1544 /* 1545 * If we are polling vbus it is likely that the gpio is on an 1546 * bus such as i2c or spi which may sleep, so schedule some work 1547 * to read the vbus gpio 1548 */ 1549 schedule_work(&udc->vbus_timer_work); 1550} 1551 1552static int at91_start(struct usb_gadget *gadget, 1553 struct usb_gadget_driver *driver) 1554{ 1555 struct at91_udc *udc; 1556 1557 udc = container_of(gadget, struct at91_udc, gadget); 1558 udc->driver = driver; 1559 udc->gadget.dev.of_node = udc->pdev->dev.of_node; 1560 udc->enabled = 1; 1561 udc->gadget.is_selfpowered = 1; 1562 1563 return 0; 1564} 1565 1566static int at91_stop(struct usb_gadget *gadget) 1567{ 1568 struct at91_udc *udc; 1569 unsigned long flags; 1570 1571 udc = container_of(gadget, struct at91_udc, gadget); 1572 spin_lock_irqsave(&udc->lock, flags); 1573 udc->enabled = 0; 1574 at91_udp_write(udc, AT91_UDP_IDR, ~0); 1575 spin_unlock_irqrestore(&udc->lock, flags); 1576 1577 udc->driver = NULL; 1578 1579 return 0; 1580} 1581 1582/*-------------------------------------------------------------------------*/ 1583 1584static void at91udc_shutdown(struct platform_device *dev) 1585{ 1586 struct at91_udc *udc = platform_get_drvdata(dev); 1587 unsigned long flags; 1588 1589 /* force disconnect on reboot */ 1590 spin_lock_irqsave(&udc->lock, flags); 1591 pullup(platform_get_drvdata(dev), 0); 1592 spin_unlock_irqrestore(&udc->lock, flags); 1593} 1594 1595static int at91rm9200_udc_init(struct at91_udc *udc) 1596{ 1597 struct at91_ep *ep; 1598 int ret; 1599 int i; 1600 1601 for (i = 0; i < NUM_ENDPOINTS; i++) { 1602 ep = &udc->ep[i]; 1603 1604 switch (i) { 1605 case 0: 1606 case 3: 1607 ep->maxpacket = 8; 1608 break; 1609 case 1 ... 2: 1610 ep->maxpacket = 64; 1611 break; 1612 case 4 ... 5: 1613 ep->maxpacket = 256; 1614 break; 1615 } 1616 } 1617 1618 if (!gpio_is_valid(udc->board.pullup_pin)) { 1619 DBG("no D+ pullup?\n"); 1620 return -ENODEV; 1621 } 1622 1623 ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin, 1624 "udc_pullup"); 1625 if (ret) { 1626 DBG("D+ pullup is busy\n"); 1627 return ret; 1628 } 1629 1630 gpio_direction_output(udc->board.pullup_pin, 1631 udc->board.pullup_active_low); 1632 1633 return 0; 1634} 1635 1636static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on) 1637{ 1638 int active = !udc->board.pullup_active_low; 1639 1640 if (is_on) 1641 gpio_set_value(udc->board.pullup_pin, active); 1642 else 1643 gpio_set_value(udc->board.pullup_pin, !active); 1644} 1645 1646static const struct at91_udc_caps at91rm9200_udc_caps = { 1647 .init = at91rm9200_udc_init, 1648 .pullup = at91rm9200_udc_pullup, 1649}; 1650 1651static int at91sam9260_udc_init(struct at91_udc *udc) 1652{ 1653 struct at91_ep *ep; 1654 int i; 1655 1656 for (i = 0; i < NUM_ENDPOINTS; i++) { 1657 ep = &udc->ep[i]; 1658 1659 switch (i) { 1660 case 0 ... 3: 1661 ep->maxpacket = 64; 1662 break; 1663 case 4 ... 5: 1664 ep->maxpacket = 512; 1665 break; 1666 } 1667 } 1668 1669 return 0; 1670} 1671 1672static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on) 1673{ 1674 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 1675 1676 if (is_on) 1677 txvc |= AT91_UDP_TXVC_PUON; 1678 else 1679 txvc &= ~AT91_UDP_TXVC_PUON; 1680 1681 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 1682} 1683 1684static const struct at91_udc_caps at91sam9260_udc_caps = { 1685 .init = at91sam9260_udc_init, 1686 .pullup = at91sam9260_udc_pullup, 1687}; 1688 1689static int at91sam9261_udc_init(struct at91_udc *udc) 1690{ 1691 struct at91_ep *ep; 1692 int i; 1693 1694 for (i = 0; i < NUM_ENDPOINTS; i++) { 1695 ep = &udc->ep[i]; 1696 1697 switch (i) { 1698 case 0: 1699 ep->maxpacket = 8; 1700 break; 1701 case 1 ... 3: 1702 ep->maxpacket = 64; 1703 break; 1704 case 4 ... 5: 1705 ep->maxpacket = 256; 1706 break; 1707 } 1708 } 1709 1710 udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node, 1711 "atmel,matrix"); 1712 return PTR_ERR_OR_ZERO(udc->matrix); 1713} 1714 1715static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on) 1716{ 1717 u32 usbpucr = 0; 1718 1719 if (is_on) 1720 usbpucr = AT91_MATRIX_USBPUCR_PUON; 1721 1722 regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR, 1723 AT91_MATRIX_USBPUCR_PUON, usbpucr); 1724} 1725 1726static const struct at91_udc_caps at91sam9261_udc_caps = { 1727 .init = at91sam9261_udc_init, 1728 .pullup = at91sam9261_udc_pullup, 1729}; 1730 1731static int at91sam9263_udc_init(struct at91_udc *udc) 1732{ 1733 struct at91_ep *ep; 1734 int i; 1735 1736 for (i = 0; i < NUM_ENDPOINTS; i++) { 1737 ep = &udc->ep[i]; 1738 1739 switch (i) { 1740 case 0: 1741 case 1: 1742 case 2: 1743 case 3: 1744 ep->maxpacket = 64; 1745 break; 1746 case 4: 1747 case 5: 1748 ep->maxpacket = 256; 1749 break; 1750 } 1751 } 1752 1753 return 0; 1754} 1755 1756static const struct at91_udc_caps at91sam9263_udc_caps = { 1757 .init = at91sam9263_udc_init, 1758 .pullup = at91sam9260_udc_pullup, 1759}; 1760 1761static const struct of_device_id at91_udc_dt_ids[] = { 1762 { 1763 .compatible = "atmel,at91rm9200-udc", 1764 .data = &at91rm9200_udc_caps, 1765 }, 1766 { 1767 .compatible = "atmel,at91sam9260-udc", 1768 .data = &at91sam9260_udc_caps, 1769 }, 1770 { 1771 .compatible = "atmel,at91sam9261-udc", 1772 .data = &at91sam9261_udc_caps, 1773 }, 1774 { 1775 .compatible = "atmel,at91sam9263-udc", 1776 .data = &at91sam9263_udc_caps, 1777 }, 1778 { /* sentinel */ } 1779}; 1780MODULE_DEVICE_TABLE(of, at91_udc_dt_ids); 1781 1782static void at91udc_of_init(struct at91_udc *udc, struct device_node *np) 1783{ 1784 struct at91_udc_data *board = &udc->board; 1785 const struct of_device_id *match; 1786 enum of_gpio_flags flags; 1787 u32 val; 1788 1789 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0) 1790 board->vbus_polled = 1; 1791 1792 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0, 1793 &flags); 1794 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1795 1796 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0, 1797 &flags); 1798 1799 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1800 1801 match = of_match_node(at91_udc_dt_ids, np); 1802 if (match) 1803 udc->caps = match->data; 1804} 1805 1806static int at91udc_probe(struct platform_device *pdev) 1807{ 1808 struct device *dev = &pdev->dev; 1809 struct at91_udc *udc; 1810 int retval; 1811 struct at91_ep *ep; 1812 int i; 1813 1814 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL); 1815 if (!udc) 1816 return -ENOMEM; 1817 1818 /* init software state */ 1819 udc->gadget.dev.parent = dev; 1820 at91udc_of_init(udc, pdev->dev.of_node); 1821 udc->pdev = pdev; 1822 udc->enabled = 0; 1823 spin_lock_init(&udc->lock); 1824 1825 udc->gadget.ops = &at91_udc_ops; 1826 udc->gadget.ep0 = &udc->ep[0].ep; 1827 udc->gadget.name = driver_name; 1828 udc->gadget.dev.init_name = "gadget"; 1829 1830 for (i = 0; i < NUM_ENDPOINTS; i++) { 1831 ep = &udc->ep[i]; 1832 ep->ep.name = ep_info[i].name; 1833 ep->ep.caps = ep_info[i].caps; 1834 ep->ep.ops = &at91_ep_ops; 1835 ep->udc = udc; 1836 ep->int_mask = BIT(i); 1837 if (i != 0 && i != 3) 1838 ep->is_pingpong = 1; 1839 } 1840 1841 udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0); 1842 if (IS_ERR(udc->udp_baseaddr)) 1843 return PTR_ERR(udc->udp_baseaddr); 1844 1845 if (udc->caps && udc->caps->init) { 1846 retval = udc->caps->init(udc); 1847 if (retval) 1848 return retval; 1849 } 1850 1851 udc_reinit(udc); 1852 1853 /* get interface and function clocks */ 1854 udc->iclk = devm_clk_get(dev, "pclk"); 1855 if (IS_ERR(udc->iclk)) 1856 return PTR_ERR(udc->iclk); 1857 1858 udc->fclk = devm_clk_get(dev, "hclk"); 1859 if (IS_ERR(udc->fclk)) 1860 return PTR_ERR(udc->fclk); 1861 1862 /* don't do anything until we have both gadget driver and VBUS */ 1863 clk_set_rate(udc->fclk, 48000000); 1864 retval = clk_prepare(udc->fclk); 1865 if (retval) 1866 return retval; 1867 1868 retval = clk_prepare_enable(udc->iclk); 1869 if (retval) 1870 goto err_unprepare_fclk; 1871 1872 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 1873 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); 1874 /* Clear all pending interrupts - UDP may be used by bootloader. */ 1875 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); 1876 clk_disable(udc->iclk); 1877 1878 /* request UDC and maybe VBUS irqs */ 1879 udc->udp_irq = retval = platform_get_irq(pdev, 0); 1880 if (retval < 0) 1881 goto err_unprepare_iclk; 1882 retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0, 1883 driver_name, udc); 1884 if (retval) { 1885 DBG("request irq %d failed\n", udc->udp_irq); 1886 goto err_unprepare_iclk; 1887 } 1888 1889 if (gpio_is_valid(udc->board.vbus_pin)) { 1890 retval = devm_gpio_request(dev, udc->board.vbus_pin, 1891 "udc_vbus"); 1892 if (retval) { 1893 DBG("request vbus pin failed\n"); 1894 goto err_unprepare_iclk; 1895 } 1896 1897 gpio_direction_input(udc->board.vbus_pin); 1898 1899 /* 1900 * Get the initial state of VBUS - we cannot expect 1901 * a pending interrupt. 1902 */ 1903 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^ 1904 udc->board.vbus_active_low; 1905 1906 if (udc->board.vbus_polled) { 1907 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work); 1908 timer_setup(&udc->vbus_timer, at91_vbus_timer, 0); 1909 mod_timer(&udc->vbus_timer, 1910 jiffies + VBUS_POLL_TIMEOUT); 1911 } else { 1912 retval = devm_request_irq(dev, 1913 gpio_to_irq(udc->board.vbus_pin), 1914 at91_vbus_irq, 0, driver_name, udc); 1915 if (retval) { 1916 DBG("request vbus irq %d failed\n", 1917 udc->board.vbus_pin); 1918 goto err_unprepare_iclk; 1919 } 1920 } 1921 } else { 1922 DBG("no VBUS detection, assuming always-on\n"); 1923 udc->vbus = 1; 1924 } 1925 retval = usb_add_gadget_udc(dev, &udc->gadget); 1926 if (retval) 1927 goto err_unprepare_iclk; 1928 dev_set_drvdata(dev, udc); 1929 device_init_wakeup(dev, 1); 1930 create_debug_file(udc); 1931 1932 INFO("%s version %s\n", driver_name, DRIVER_VERSION); 1933 return 0; 1934 1935err_unprepare_iclk: 1936 clk_unprepare(udc->iclk); 1937err_unprepare_fclk: 1938 clk_unprepare(udc->fclk); 1939 1940 DBG("%s probe failed, %d\n", driver_name, retval); 1941 1942 return retval; 1943} 1944 1945static int at91udc_remove(struct platform_device *pdev) 1946{ 1947 struct at91_udc *udc = platform_get_drvdata(pdev); 1948 unsigned long flags; 1949 1950 DBG("remove\n"); 1951 1952 usb_del_gadget_udc(&udc->gadget); 1953 if (udc->driver) 1954 return -EBUSY; 1955 1956 spin_lock_irqsave(&udc->lock, flags); 1957 pullup(udc, 0); 1958 spin_unlock_irqrestore(&udc->lock, flags); 1959 1960 device_init_wakeup(&pdev->dev, 0); 1961 remove_debug_file(udc); 1962 clk_unprepare(udc->fclk); 1963 clk_unprepare(udc->iclk); 1964 1965 return 0; 1966} 1967 1968#ifdef CONFIG_PM 1969static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) 1970{ 1971 struct at91_udc *udc = platform_get_drvdata(pdev); 1972 int wake = udc->driver && device_may_wakeup(&pdev->dev); 1973 unsigned long flags; 1974 1975 /* Unless we can act normally to the host (letting it wake us up 1976 * whenever it has work for us) force disconnect. Wakeup requires 1977 * PLLB for USB events (signaling for reset, wakeup, or incoming 1978 * tokens) and VBUS irqs (on systems which support them). 1979 */ 1980 if ((!udc->suspended && udc->addr) 1981 || !wake 1982 || at91_suspend_entering_slow_clock()) { 1983 spin_lock_irqsave(&udc->lock, flags); 1984 pullup(udc, 0); 1985 wake = 0; 1986 spin_unlock_irqrestore(&udc->lock, flags); 1987 } else 1988 enable_irq_wake(udc->udp_irq); 1989 1990 udc->active_suspend = wake; 1991 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake) 1992 enable_irq_wake(udc->board.vbus_pin); 1993 return 0; 1994} 1995 1996static int at91udc_resume(struct platform_device *pdev) 1997{ 1998 struct at91_udc *udc = platform_get_drvdata(pdev); 1999 unsigned long flags; 2000 2001 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && 2002 udc->active_suspend) 2003 disable_irq_wake(udc->board.vbus_pin); 2004 2005 /* maybe reconnect to host; if so, clocks on */ 2006 if (udc->active_suspend) 2007 disable_irq_wake(udc->udp_irq); 2008 else { 2009 spin_lock_irqsave(&udc->lock, flags); 2010 pullup(udc, 1); 2011 spin_unlock_irqrestore(&udc->lock, flags); 2012 } 2013 return 0; 2014} 2015#else 2016#define at91udc_suspend NULL 2017#define at91udc_resume NULL 2018#endif 2019 2020static struct platform_driver at91_udc_driver = { 2021 .remove = at91udc_remove, 2022 .shutdown = at91udc_shutdown, 2023 .suspend = at91udc_suspend, 2024 .resume = at91udc_resume, 2025 .driver = { 2026 .name = driver_name, 2027 .of_match_table = at91_udc_dt_ids, 2028 }, 2029}; 2030 2031module_platform_driver_probe(at91_udc_driver, at91udc_probe); 2032 2033MODULE_DESCRIPTION("AT91 udc driver"); 2034MODULE_AUTHOR("Thomas Rathbone, David Brownell"); 2035MODULE_LICENSE("GPL"); 2036MODULE_ALIAS("platform:at91_udc"); 2037