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/gpio/consumer.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 = NULL, *iter; 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(iter, &ep->queue, queue) { 721 if (&iter->req != _req) 722 continue; 723 req = iter; 724 break; 725 } 726 if (!req) { 727 spin_unlock_irqrestore(&udc->lock, flags); 728 return -EINVAL; 729 } 730 731 done(ep, req, -ECONNRESET); 732 spin_unlock_irqrestore(&udc->lock, flags); 733 return 0; 734} 735 736static int at91_ep_set_halt(struct usb_ep *_ep, int value) 737{ 738 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 739 struct at91_udc *udc = ep->udc; 740 u32 __iomem *creg; 741 u32 csr; 742 unsigned long flags; 743 int status = 0; 744 745 if (!_ep || ep->is_iso || !ep->udc->clocked) 746 return -EINVAL; 747 748 creg = ep->creg; 749 spin_lock_irqsave(&udc->lock, flags); 750 751 csr = __raw_readl(creg); 752 753 /* 754 * fail with still-busy IN endpoints, ensuring correct sequencing 755 * of data tx then stall. note that the fifo rx bytecount isn't 756 * completely accurate as a tx bytecount. 757 */ 758 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) 759 status = -EAGAIN; 760 else { 761 csr |= CLR_FX; 762 csr &= ~SET_FX; 763 if (value) { 764 csr |= AT91_UDP_FORCESTALL; 765 VDBG("halt %s\n", ep->ep.name); 766 } else { 767 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 768 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 769 csr &= ~AT91_UDP_FORCESTALL; 770 } 771 __raw_writel(csr, creg); 772 } 773 774 spin_unlock_irqrestore(&udc->lock, flags); 775 return status; 776} 777 778static const struct usb_ep_ops at91_ep_ops = { 779 .enable = at91_ep_enable, 780 .disable = at91_ep_disable, 781 .alloc_request = at91_ep_alloc_request, 782 .free_request = at91_ep_free_request, 783 .queue = at91_ep_queue, 784 .dequeue = at91_ep_dequeue, 785 .set_halt = at91_ep_set_halt, 786 /* there's only imprecise fifo status reporting */ 787}; 788 789/*-------------------------------------------------------------------------*/ 790 791static int at91_get_frame(struct usb_gadget *gadget) 792{ 793 struct at91_udc *udc = to_udc(gadget); 794 795 if (!to_udc(gadget)->clocked) 796 return -EINVAL; 797 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; 798} 799 800static int at91_wakeup(struct usb_gadget *gadget) 801{ 802 struct at91_udc *udc = to_udc(gadget); 803 u32 glbstate; 804 unsigned long flags; 805 806 DBG("%s\n", __func__ ); 807 spin_lock_irqsave(&udc->lock, flags); 808 809 if (!udc->clocked || !udc->suspended) 810 goto done; 811 812 /* NOTE: some "early versions" handle ESR differently ... */ 813 814 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); 815 if (!(glbstate & AT91_UDP_ESR)) 816 goto done; 817 glbstate |= AT91_UDP_ESR; 818 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); 819 820done: 821 spin_unlock_irqrestore(&udc->lock, flags); 822 return 0; 823} 824 825/* reinit == restore initial software state */ 826static void udc_reinit(struct at91_udc *udc) 827{ 828 u32 i; 829 830 INIT_LIST_HEAD(&udc->gadget.ep_list); 831 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); 832 udc->gadget.quirk_stall_not_supp = 1; 833 834 for (i = 0; i < NUM_ENDPOINTS; i++) { 835 struct at91_ep *ep = &udc->ep[i]; 836 837 if (i != 0) 838 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 839 ep->ep.desc = NULL; 840 ep->stopped = 0; 841 ep->fifo_bank = 0; 842 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 843 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); 844 /* initialize one queue per endpoint */ 845 INIT_LIST_HEAD(&ep->queue); 846 } 847} 848 849static void reset_gadget(struct at91_udc *udc) 850{ 851 struct usb_gadget_driver *driver = udc->driver; 852 int i; 853 854 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 855 driver = NULL; 856 udc->gadget.speed = USB_SPEED_UNKNOWN; 857 udc->suspended = 0; 858 859 for (i = 0; i < NUM_ENDPOINTS; i++) { 860 struct at91_ep *ep = &udc->ep[i]; 861 862 ep->stopped = 1; 863 nuke(ep, -ESHUTDOWN); 864 } 865 if (driver) { 866 spin_unlock(&udc->lock); 867 usb_gadget_udc_reset(&udc->gadget, driver); 868 spin_lock(&udc->lock); 869 } 870 871 udc_reinit(udc); 872} 873 874static void stop_activity(struct at91_udc *udc) 875{ 876 struct usb_gadget_driver *driver = udc->driver; 877 int i; 878 879 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 880 driver = NULL; 881 udc->gadget.speed = USB_SPEED_UNKNOWN; 882 udc->suspended = 0; 883 884 for (i = 0; i < NUM_ENDPOINTS; i++) { 885 struct at91_ep *ep = &udc->ep[i]; 886 ep->stopped = 1; 887 nuke(ep, -ESHUTDOWN); 888 } 889 if (driver) { 890 spin_unlock(&udc->lock); 891 driver->disconnect(&udc->gadget); 892 spin_lock(&udc->lock); 893 } 894 895 udc_reinit(udc); 896} 897 898static void clk_on(struct at91_udc *udc) 899{ 900 if (udc->clocked) 901 return; 902 udc->clocked = 1; 903 904 clk_enable(udc->iclk); 905 clk_enable(udc->fclk); 906} 907 908static void clk_off(struct at91_udc *udc) 909{ 910 if (!udc->clocked) 911 return; 912 udc->clocked = 0; 913 udc->gadget.speed = USB_SPEED_UNKNOWN; 914 clk_disable(udc->fclk); 915 clk_disable(udc->iclk); 916} 917 918/* 919 * activate/deactivate link with host; minimize power usage for 920 * inactive links by cutting clocks and transceiver power. 921 */ 922static void pullup(struct at91_udc *udc, int is_on) 923{ 924 if (!udc->enabled || !udc->vbus) 925 is_on = 0; 926 DBG("%sactive\n", is_on ? "" : "in"); 927 928 if (is_on) { 929 clk_on(udc); 930 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 931 at91_udp_write(udc, AT91_UDP_TXVC, 0); 932 } else { 933 stop_activity(udc); 934 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 935 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 936 clk_off(udc); 937 } 938 939 if (udc->caps && udc->caps->pullup) 940 udc->caps->pullup(udc, is_on); 941} 942 943/* vbus is here! turn everything on that's ready */ 944static int at91_vbus_session(struct usb_gadget *gadget, int is_active) 945{ 946 struct at91_udc *udc = to_udc(gadget); 947 unsigned long flags; 948 949 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ 950 spin_lock_irqsave(&udc->lock, flags); 951 udc->vbus = (is_active != 0); 952 if (udc->driver) 953 pullup(udc, is_active); 954 else 955 pullup(udc, 0); 956 spin_unlock_irqrestore(&udc->lock, flags); 957 return 0; 958} 959 960static int at91_pullup(struct usb_gadget *gadget, int is_on) 961{ 962 struct at91_udc *udc = to_udc(gadget); 963 unsigned long flags; 964 965 spin_lock_irqsave(&udc->lock, flags); 966 udc->enabled = is_on = !!is_on; 967 pullup(udc, is_on); 968 spin_unlock_irqrestore(&udc->lock, flags); 969 return 0; 970} 971 972static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) 973{ 974 struct at91_udc *udc = to_udc(gadget); 975 unsigned long flags; 976 977 spin_lock_irqsave(&udc->lock, flags); 978 gadget->is_selfpowered = (is_on != 0); 979 spin_unlock_irqrestore(&udc->lock, flags); 980 return 0; 981} 982 983static int at91_start(struct usb_gadget *gadget, 984 struct usb_gadget_driver *driver); 985static int at91_stop(struct usb_gadget *gadget); 986 987static const struct usb_gadget_ops at91_udc_ops = { 988 .get_frame = at91_get_frame, 989 .wakeup = at91_wakeup, 990 .set_selfpowered = at91_set_selfpowered, 991 .vbus_session = at91_vbus_session, 992 .pullup = at91_pullup, 993 .udc_start = at91_start, 994 .udc_stop = at91_stop, 995 996 /* 997 * VBUS-powered devices may also want to support bigger 998 * power budgets after an appropriate SET_CONFIGURATION. 999 */ 1000 /* .vbus_power = at91_vbus_power, */ 1001}; 1002 1003/*-------------------------------------------------------------------------*/ 1004 1005static int handle_ep(struct at91_ep *ep) 1006{ 1007 struct at91_request *req; 1008 u32 __iomem *creg = ep->creg; 1009 u32 csr = __raw_readl(creg); 1010 1011 if (!list_empty(&ep->queue)) 1012 req = list_entry(ep->queue.next, 1013 struct at91_request, queue); 1014 else 1015 req = NULL; 1016 1017 if (ep->is_in) { 1018 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { 1019 csr |= CLR_FX; 1020 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); 1021 __raw_writel(csr, creg); 1022 } 1023 if (req) 1024 return write_fifo(ep, req); 1025 1026 } else { 1027 if (csr & AT91_UDP_STALLSENT) { 1028 /* STALLSENT bit == ISOERR */ 1029 if (ep->is_iso && req) 1030 req->req.status = -EILSEQ; 1031 csr |= CLR_FX; 1032 csr &= ~(SET_FX | AT91_UDP_STALLSENT); 1033 __raw_writel(csr, creg); 1034 csr = __raw_readl(creg); 1035 } 1036 if (req && (csr & RX_DATA_READY)) 1037 return read_fifo(ep, req); 1038 } 1039 return 0; 1040} 1041 1042union setup { 1043 u8 raw[8]; 1044 struct usb_ctrlrequest r; 1045}; 1046 1047static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) 1048{ 1049 u32 __iomem *creg = ep->creg; 1050 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 1051 unsigned rxcount, i = 0; 1052 u32 tmp; 1053 union setup pkt; 1054 int status = 0; 1055 1056 /* read and ack SETUP; hard-fail for bogus packets */ 1057 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; 1058 if (likely(rxcount == 8)) { 1059 while (rxcount--) 1060 pkt.raw[i++] = __raw_readb(dreg); 1061 if (pkt.r.bRequestType & USB_DIR_IN) { 1062 csr |= AT91_UDP_DIR; 1063 ep->is_in = 1; 1064 } else { 1065 csr &= ~AT91_UDP_DIR; 1066 ep->is_in = 0; 1067 } 1068 } else { 1069 /* REVISIT this happens sometimes under load; why?? */ 1070 ERR("SETUP len %d, csr %08x\n", rxcount, csr); 1071 status = -EINVAL; 1072 } 1073 csr |= CLR_FX; 1074 csr &= ~(SET_FX | AT91_UDP_RXSETUP); 1075 __raw_writel(csr, creg); 1076 udc->wait_for_addr_ack = 0; 1077 udc->wait_for_config_ack = 0; 1078 ep->stopped = 0; 1079 if (unlikely(status != 0)) 1080 goto stall; 1081 1082#define w_index le16_to_cpu(pkt.r.wIndex) 1083#define w_value le16_to_cpu(pkt.r.wValue) 1084#define w_length le16_to_cpu(pkt.r.wLength) 1085 1086 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 1087 pkt.r.bRequestType, pkt.r.bRequest, 1088 w_value, w_index, w_length); 1089 1090 /* 1091 * A few standard requests get handled here, ones that touch 1092 * hardware ... notably for device and endpoint features. 1093 */ 1094 udc->req_pending = 1; 1095 csr = __raw_readl(creg); 1096 csr |= CLR_FX; 1097 csr &= ~SET_FX; 1098 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { 1099 1100 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1101 | USB_REQ_SET_ADDRESS: 1102 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); 1103 udc->addr = w_value; 1104 udc->wait_for_addr_ack = 1; 1105 udc->req_pending = 0; 1106 /* FADDR is set later, when we ack host STATUS */ 1107 return; 1108 1109 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1110 | USB_REQ_SET_CONFIGURATION: 1111 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; 1112 if (pkt.r.wValue) 1113 udc->wait_for_config_ack = (tmp == 0); 1114 else 1115 udc->wait_for_config_ack = (tmp != 0); 1116 if (udc->wait_for_config_ack) 1117 VDBG("wait for config\n"); 1118 /* CONFG is toggled later, if gadget driver succeeds */ 1119 break; 1120 1121 /* 1122 * Hosts may set or clear remote wakeup status, and 1123 * devices may report they're VBUS powered. 1124 */ 1125 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1126 | USB_REQ_GET_STATUS: 1127 tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED); 1128 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) 1129 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); 1130 PACKET("get device status\n"); 1131 __raw_writeb(tmp, dreg); 1132 __raw_writeb(0, dreg); 1133 goto write_in; 1134 /* then STATUS starts later, automatically */ 1135 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1136 | USB_REQ_SET_FEATURE: 1137 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1138 goto stall; 1139 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1140 tmp |= AT91_UDP_ESR; 1141 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1142 goto succeed; 1143 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1144 | USB_REQ_CLEAR_FEATURE: 1145 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1146 goto stall; 1147 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1148 tmp &= ~AT91_UDP_ESR; 1149 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1150 goto succeed; 1151 1152 /* 1153 * Interfaces have no feature settings; this is pretty useless. 1154 * we won't even insist the interface exists... 1155 */ 1156 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1157 | USB_REQ_GET_STATUS: 1158 PACKET("get interface status\n"); 1159 __raw_writeb(0, dreg); 1160 __raw_writeb(0, dreg); 1161 goto write_in; 1162 /* then STATUS starts later, automatically */ 1163 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1164 | USB_REQ_SET_FEATURE: 1165 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1166 | USB_REQ_CLEAR_FEATURE: 1167 goto stall; 1168 1169 /* 1170 * Hosts may clear bulk/intr endpoint halt after the gadget 1171 * driver sets it (not widely used); or set it (for testing) 1172 */ 1173 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1174 | USB_REQ_GET_STATUS: 1175 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1176 ep = &udc->ep[tmp]; 1177 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc)) 1178 goto stall; 1179 1180 if (tmp) { 1181 if ((w_index & USB_DIR_IN)) { 1182 if (!ep->is_in) 1183 goto stall; 1184 } else if (ep->is_in) 1185 goto stall; 1186 } 1187 PACKET("get %s status\n", ep->ep.name); 1188 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) 1189 tmp = (1 << USB_ENDPOINT_HALT); 1190 else 1191 tmp = 0; 1192 __raw_writeb(tmp, dreg); 1193 __raw_writeb(0, dreg); 1194 goto write_in; 1195 /* then STATUS starts later, automatically */ 1196 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1197 | USB_REQ_SET_FEATURE: 1198 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1199 ep = &udc->ep[tmp]; 1200 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1201 goto stall; 1202 if (!ep->ep.desc || ep->is_iso) 1203 goto stall; 1204 if ((w_index & USB_DIR_IN)) { 1205 if (!ep->is_in) 1206 goto stall; 1207 } else if (ep->is_in) 1208 goto stall; 1209 1210 tmp = __raw_readl(ep->creg); 1211 tmp &= ~SET_FX; 1212 tmp |= CLR_FX | AT91_UDP_FORCESTALL; 1213 __raw_writel(tmp, ep->creg); 1214 goto succeed; 1215 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1216 | USB_REQ_CLEAR_FEATURE: 1217 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1218 ep = &udc->ep[tmp]; 1219 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1220 goto stall; 1221 if (tmp == 0) 1222 goto succeed; 1223 if (!ep->ep.desc || ep->is_iso) 1224 goto stall; 1225 if ((w_index & USB_DIR_IN)) { 1226 if (!ep->is_in) 1227 goto stall; 1228 } else if (ep->is_in) 1229 goto stall; 1230 1231 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 1232 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 1233 tmp = __raw_readl(ep->creg); 1234 tmp |= CLR_FX; 1235 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); 1236 __raw_writel(tmp, ep->creg); 1237 if (!list_empty(&ep->queue)) 1238 handle_ep(ep); 1239 goto succeed; 1240 } 1241 1242#undef w_value 1243#undef w_index 1244#undef w_length 1245 1246 /* pass request up to the gadget driver */ 1247 if (udc->driver) { 1248 spin_unlock(&udc->lock); 1249 status = udc->driver->setup(&udc->gadget, &pkt.r); 1250 spin_lock(&udc->lock); 1251 } 1252 else 1253 status = -ENODEV; 1254 if (status < 0) { 1255stall: 1256 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1257 pkt.r.bRequestType, pkt.r.bRequest, status); 1258 csr |= AT91_UDP_FORCESTALL; 1259 __raw_writel(csr, creg); 1260 udc->req_pending = 0; 1261 } 1262 return; 1263 1264succeed: 1265 /* immediate successful (IN) STATUS after zero length DATA */ 1266 PACKET("ep0 in/status\n"); 1267write_in: 1268 csr |= AT91_UDP_TXPKTRDY; 1269 __raw_writel(csr, creg); 1270 udc->req_pending = 0; 1271} 1272 1273static void handle_ep0(struct at91_udc *udc) 1274{ 1275 struct at91_ep *ep0 = &udc->ep[0]; 1276 u32 __iomem *creg = ep0->creg; 1277 u32 csr = __raw_readl(creg); 1278 struct at91_request *req; 1279 1280 if (unlikely(csr & AT91_UDP_STALLSENT)) { 1281 nuke(ep0, -EPROTO); 1282 udc->req_pending = 0; 1283 csr |= CLR_FX; 1284 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); 1285 __raw_writel(csr, creg); 1286 VDBG("ep0 stalled\n"); 1287 csr = __raw_readl(creg); 1288 } 1289 if (csr & AT91_UDP_RXSETUP) { 1290 nuke(ep0, 0); 1291 udc->req_pending = 0; 1292 handle_setup(udc, ep0, csr); 1293 return; 1294 } 1295 1296 if (list_empty(&ep0->queue)) 1297 req = NULL; 1298 else 1299 req = list_entry(ep0->queue.next, struct at91_request, queue); 1300 1301 /* host ACKed an IN packet that we sent */ 1302 if (csr & AT91_UDP_TXCOMP) { 1303 csr |= CLR_FX; 1304 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 1305 1306 /* write more IN DATA? */ 1307 if (req && ep0->is_in) { 1308 if (handle_ep(ep0)) 1309 udc->req_pending = 0; 1310 1311 /* 1312 * Ack after: 1313 * - last IN DATA packet (including GET_STATUS) 1314 * - IN/STATUS for OUT DATA 1315 * - IN/STATUS for any zero-length DATA stage 1316 * except for the IN DATA case, the host should send 1317 * an OUT status later, which we'll ack. 1318 */ 1319 } else { 1320 udc->req_pending = 0; 1321 __raw_writel(csr, creg); 1322 1323 /* 1324 * SET_ADDRESS takes effect only after the STATUS 1325 * (to the original address) gets acked. 1326 */ 1327 if (udc->wait_for_addr_ack) { 1328 u32 tmp; 1329 1330 at91_udp_write(udc, AT91_UDP_FADDR, 1331 AT91_UDP_FEN | udc->addr); 1332 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1333 tmp &= ~AT91_UDP_FADDEN; 1334 if (udc->addr) 1335 tmp |= AT91_UDP_FADDEN; 1336 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1337 1338 udc->wait_for_addr_ack = 0; 1339 VDBG("address %d\n", udc->addr); 1340 } 1341 } 1342 } 1343 1344 /* OUT packet arrived ... */ 1345 else if (csr & AT91_UDP_RX_DATA_BK0) { 1346 csr |= CLR_FX; 1347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 1348 1349 /* OUT DATA stage */ 1350 if (!ep0->is_in) { 1351 if (req) { 1352 if (handle_ep(ep0)) { 1353 /* send IN/STATUS */ 1354 PACKET("ep0 in/status\n"); 1355 csr = __raw_readl(creg); 1356 csr &= ~SET_FX; 1357 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 1358 __raw_writel(csr, creg); 1359 udc->req_pending = 0; 1360 } 1361 } else if (udc->req_pending) { 1362 /* 1363 * AT91 hardware has a hard time with this 1364 * "deferred response" mode for control-OUT 1365 * transfers. (For control-IN it's fine.) 1366 * 1367 * The normal solution leaves OUT data in the 1368 * fifo until the gadget driver is ready. 1369 * We couldn't do that here without disabling 1370 * the IRQ that tells about SETUP packets, 1371 * e.g. when the host gets impatient... 1372 * 1373 * Working around it by copying into a buffer 1374 * would almost be a non-deferred response, 1375 * except that it wouldn't permit reliable 1376 * stalling of the request. Instead, demand 1377 * that gadget drivers not use this mode. 1378 */ 1379 DBG("no control-OUT deferred responses!\n"); 1380 __raw_writel(csr | AT91_UDP_FORCESTALL, creg); 1381 udc->req_pending = 0; 1382 } 1383 1384 /* STATUS stage for control-IN; ack. */ 1385 } else { 1386 PACKET("ep0 out/status ACK\n"); 1387 __raw_writel(csr, creg); 1388 1389 /* "early" status stage */ 1390 if (req) 1391 done(ep0, req, 0); 1392 } 1393 } 1394} 1395 1396static irqreturn_t at91_udc_irq (int irq, void *_udc) 1397{ 1398 struct at91_udc *udc = _udc; 1399 u32 rescans = 5; 1400 int disable_clock = 0; 1401 unsigned long flags; 1402 1403 spin_lock_irqsave(&udc->lock, flags); 1404 1405 if (!udc->clocked) { 1406 clk_on(udc); 1407 disable_clock = 1; 1408 } 1409 1410 while (rescans--) { 1411 u32 status; 1412 1413 status = at91_udp_read(udc, AT91_UDP_ISR) 1414 & at91_udp_read(udc, AT91_UDP_IMR); 1415 if (!status) 1416 break; 1417 1418 /* USB reset irq: not maskable */ 1419 if (status & AT91_UDP_ENDBUSRES) { 1420 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); 1421 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS); 1422 /* Atmel code clears this irq twice */ 1423 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1424 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1425 VDBG("end bus reset\n"); 1426 udc->addr = 0; 1427 reset_gadget(udc); 1428 1429 /* enable ep0 */ 1430 at91_udp_write(udc, AT91_UDP_CSR(0), 1431 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); 1432 udc->gadget.speed = USB_SPEED_FULL; 1433 udc->suspended = 0; 1434 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0)); 1435 1436 /* 1437 * NOTE: this driver keeps clocks off unless the 1438 * USB host is present. That saves power, but for 1439 * boards that don't support VBUS detection, both 1440 * clocks need to be active most of the time. 1441 */ 1442 1443 /* host initiated suspend (3+ms bus idle) */ 1444 } else if (status & AT91_UDP_RXSUSP) { 1445 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); 1446 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); 1447 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); 1448 /* VDBG("bus suspend\n"); */ 1449 if (udc->suspended) 1450 continue; 1451 udc->suspended = 1; 1452 1453 /* 1454 * NOTE: when suspending a VBUS-powered device, the 1455 * gadget driver should switch into slow clock mode 1456 * and then into standby to avoid drawing more than 1457 * 500uA power (2500uA for some high-power configs). 1458 */ 1459 if (udc->driver && udc->driver->suspend) { 1460 spin_unlock(&udc->lock); 1461 udc->driver->suspend(&udc->gadget); 1462 spin_lock(&udc->lock); 1463 } 1464 1465 /* host initiated resume */ 1466 } else if (status & AT91_UDP_RXRSM) { 1467 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 1468 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP); 1469 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 1470 /* VDBG("bus resume\n"); */ 1471 if (!udc->suspended) 1472 continue; 1473 udc->suspended = 0; 1474 1475 /* 1476 * NOTE: for a VBUS-powered device, the gadget driver 1477 * would normally want to switch out of slow clock 1478 * mode into normal mode. 1479 */ 1480 if (udc->driver && udc->driver->resume) { 1481 spin_unlock(&udc->lock); 1482 udc->driver->resume(&udc->gadget); 1483 spin_lock(&udc->lock); 1484 } 1485 1486 /* endpoint IRQs are cleared by handling them */ 1487 } else { 1488 int i; 1489 unsigned mask = 1; 1490 struct at91_ep *ep = &udc->ep[1]; 1491 1492 if (status & mask) 1493 handle_ep0(udc); 1494 for (i = 1; i < NUM_ENDPOINTS; i++) { 1495 mask <<= 1; 1496 if (status & mask) 1497 handle_ep(ep); 1498 ep++; 1499 } 1500 } 1501 } 1502 1503 if (disable_clock) 1504 clk_off(udc); 1505 1506 spin_unlock_irqrestore(&udc->lock, flags); 1507 1508 return IRQ_HANDLED; 1509} 1510 1511/*-------------------------------------------------------------------------*/ 1512 1513static void at91_vbus_update(struct at91_udc *udc, unsigned value) 1514{ 1515 if (value != udc->vbus) 1516 at91_vbus_session(&udc->gadget, value); 1517} 1518 1519static irqreturn_t at91_vbus_irq(int irq, void *_udc) 1520{ 1521 struct at91_udc *udc = _udc; 1522 1523 /* vbus needs at least brief debouncing */ 1524 udelay(10); 1525 at91_vbus_update(udc, gpiod_get_value(udc->board.vbus_pin)); 1526 1527 return IRQ_HANDLED; 1528} 1529 1530static void at91_vbus_timer_work(struct work_struct *work) 1531{ 1532 struct at91_udc *udc = container_of(work, struct at91_udc, 1533 vbus_timer_work); 1534 1535 at91_vbus_update(udc, gpiod_get_value_cansleep(udc->board.vbus_pin)); 1536 1537 if (!timer_pending(&udc->vbus_timer)) 1538 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT); 1539} 1540 1541static void at91_vbus_timer(struct timer_list *t) 1542{ 1543 struct at91_udc *udc = from_timer(udc, t, vbus_timer); 1544 1545 /* 1546 * If we are polling vbus it is likely that the gpio is on an 1547 * bus such as i2c or spi which may sleep, so schedule some work 1548 * to read the vbus gpio 1549 */ 1550 schedule_work(&udc->vbus_timer_work); 1551} 1552 1553static int at91_start(struct usb_gadget *gadget, 1554 struct usb_gadget_driver *driver) 1555{ 1556 struct at91_udc *udc; 1557 1558 udc = container_of(gadget, struct at91_udc, gadget); 1559 udc->driver = driver; 1560 udc->gadget.dev.of_node = udc->pdev->dev.of_node; 1561 udc->enabled = 1; 1562 udc->gadget.is_selfpowered = 1; 1563 1564 return 0; 1565} 1566 1567static int at91_stop(struct usb_gadget *gadget) 1568{ 1569 struct at91_udc *udc; 1570 unsigned long flags; 1571 1572 udc = container_of(gadget, struct at91_udc, gadget); 1573 spin_lock_irqsave(&udc->lock, flags); 1574 udc->enabled = 0; 1575 at91_udp_write(udc, AT91_UDP_IDR, ~0); 1576 spin_unlock_irqrestore(&udc->lock, flags); 1577 1578 udc->driver = NULL; 1579 1580 return 0; 1581} 1582 1583/*-------------------------------------------------------------------------*/ 1584 1585static void at91udc_shutdown(struct platform_device *dev) 1586{ 1587 struct at91_udc *udc = platform_get_drvdata(dev); 1588 unsigned long flags; 1589 1590 /* force disconnect on reboot */ 1591 spin_lock_irqsave(&udc->lock, flags); 1592 pullup(platform_get_drvdata(dev), 0); 1593 spin_unlock_irqrestore(&udc->lock, flags); 1594} 1595 1596static int at91rm9200_udc_init(struct at91_udc *udc) 1597{ 1598 struct at91_ep *ep; 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 (!udc->board.pullup_pin) { 1619 DBG("no D+ pullup?\n"); 1620 return -ENODEV; 1621 } 1622 1623 gpiod_direction_output(udc->board.pullup_pin, 1624 gpiod_is_active_low(udc->board.pullup_pin)); 1625 1626 return 0; 1627} 1628 1629static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on) 1630{ 1631 gpiod_set_value(udc->board.pullup_pin, is_on); 1632} 1633 1634static const struct at91_udc_caps at91rm9200_udc_caps = { 1635 .init = at91rm9200_udc_init, 1636 .pullup = at91rm9200_udc_pullup, 1637}; 1638 1639static int at91sam9260_udc_init(struct at91_udc *udc) 1640{ 1641 struct at91_ep *ep; 1642 int i; 1643 1644 for (i = 0; i < NUM_ENDPOINTS; i++) { 1645 ep = &udc->ep[i]; 1646 1647 switch (i) { 1648 case 0 ... 3: 1649 ep->maxpacket = 64; 1650 break; 1651 case 4 ... 5: 1652 ep->maxpacket = 512; 1653 break; 1654 } 1655 } 1656 1657 return 0; 1658} 1659 1660static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on) 1661{ 1662 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 1663 1664 if (is_on) 1665 txvc |= AT91_UDP_TXVC_PUON; 1666 else 1667 txvc &= ~AT91_UDP_TXVC_PUON; 1668 1669 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 1670} 1671 1672static const struct at91_udc_caps at91sam9260_udc_caps = { 1673 .init = at91sam9260_udc_init, 1674 .pullup = at91sam9260_udc_pullup, 1675}; 1676 1677static int at91sam9261_udc_init(struct at91_udc *udc) 1678{ 1679 struct at91_ep *ep; 1680 int i; 1681 1682 for (i = 0; i < NUM_ENDPOINTS; i++) { 1683 ep = &udc->ep[i]; 1684 1685 switch (i) { 1686 case 0: 1687 ep->maxpacket = 8; 1688 break; 1689 case 1 ... 3: 1690 ep->maxpacket = 64; 1691 break; 1692 case 4 ... 5: 1693 ep->maxpacket = 256; 1694 break; 1695 } 1696 } 1697 1698 udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node, 1699 "atmel,matrix"); 1700 return PTR_ERR_OR_ZERO(udc->matrix); 1701} 1702 1703static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on) 1704{ 1705 u32 usbpucr = 0; 1706 1707 if (is_on) 1708 usbpucr = AT91_MATRIX_USBPUCR_PUON; 1709 1710 regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR, 1711 AT91_MATRIX_USBPUCR_PUON, usbpucr); 1712} 1713 1714static const struct at91_udc_caps at91sam9261_udc_caps = { 1715 .init = at91sam9261_udc_init, 1716 .pullup = at91sam9261_udc_pullup, 1717}; 1718 1719static int at91sam9263_udc_init(struct at91_udc *udc) 1720{ 1721 struct at91_ep *ep; 1722 int i; 1723 1724 for (i = 0; i < NUM_ENDPOINTS; i++) { 1725 ep = &udc->ep[i]; 1726 1727 switch (i) { 1728 case 0: 1729 case 1: 1730 case 2: 1731 case 3: 1732 ep->maxpacket = 64; 1733 break; 1734 case 4: 1735 case 5: 1736 ep->maxpacket = 256; 1737 break; 1738 } 1739 } 1740 1741 return 0; 1742} 1743 1744static const struct at91_udc_caps at91sam9263_udc_caps = { 1745 .init = at91sam9263_udc_init, 1746 .pullup = at91sam9260_udc_pullup, 1747}; 1748 1749static const struct of_device_id at91_udc_dt_ids[] = { 1750 { 1751 .compatible = "atmel,at91rm9200-udc", 1752 .data = &at91rm9200_udc_caps, 1753 }, 1754 { 1755 .compatible = "atmel,at91sam9260-udc", 1756 .data = &at91sam9260_udc_caps, 1757 }, 1758 { 1759 .compatible = "atmel,at91sam9261-udc", 1760 .data = &at91sam9261_udc_caps, 1761 }, 1762 { 1763 .compatible = "atmel,at91sam9263-udc", 1764 .data = &at91sam9263_udc_caps, 1765 }, 1766 { /* sentinel */ } 1767}; 1768MODULE_DEVICE_TABLE(of, at91_udc_dt_ids); 1769 1770static void at91udc_of_init(struct at91_udc *udc, struct device_node *np) 1771{ 1772 struct at91_udc_data *board = &udc->board; 1773 const struct of_device_id *match; 1774 u32 val; 1775 1776 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0) 1777 board->vbus_polled = 1; 1778 1779 board->vbus_pin = fwnode_gpiod_get_index(of_fwnode_handle(np), 1780 "atmel,vbus", 0, GPIOD_IN, 1781 "udc_vbus"); 1782 if (IS_ERR(board->vbus_pin)) 1783 board->vbus_pin = NULL; 1784 1785 board->pullup_pin = fwnode_gpiod_get_index(of_fwnode_handle(np), 1786 "atmel,pullup", 0, 1787 GPIOD_ASIS, "udc_pullup"); 1788 if (IS_ERR(board->pullup_pin)) 1789 board->pullup_pin = NULL; 1790 1791 match = of_match_node(at91_udc_dt_ids, np); 1792 if (match) 1793 udc->caps = match->data; 1794} 1795 1796static int at91udc_probe(struct platform_device *pdev) 1797{ 1798 struct device *dev = &pdev->dev; 1799 struct at91_udc *udc; 1800 int retval; 1801 struct at91_ep *ep; 1802 int i; 1803 1804 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL); 1805 if (!udc) 1806 return -ENOMEM; 1807 1808 /* init software state */ 1809 udc->gadget.dev.parent = dev; 1810 at91udc_of_init(udc, pdev->dev.of_node); 1811 udc->pdev = pdev; 1812 udc->enabled = 0; 1813 spin_lock_init(&udc->lock); 1814 1815 udc->gadget.ops = &at91_udc_ops; 1816 udc->gadget.ep0 = &udc->ep[0].ep; 1817 udc->gadget.name = driver_name; 1818 udc->gadget.dev.init_name = "gadget"; 1819 1820 for (i = 0; i < NUM_ENDPOINTS; i++) { 1821 ep = &udc->ep[i]; 1822 ep->ep.name = ep_info[i].name; 1823 ep->ep.caps = ep_info[i].caps; 1824 ep->ep.ops = &at91_ep_ops; 1825 ep->udc = udc; 1826 ep->int_mask = BIT(i); 1827 if (i != 0 && i != 3) 1828 ep->is_pingpong = 1; 1829 } 1830 1831 udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0); 1832 if (IS_ERR(udc->udp_baseaddr)) 1833 return PTR_ERR(udc->udp_baseaddr); 1834 1835 if (udc->caps && udc->caps->init) { 1836 retval = udc->caps->init(udc); 1837 if (retval) 1838 return retval; 1839 } 1840 1841 udc_reinit(udc); 1842 1843 /* get interface and function clocks */ 1844 udc->iclk = devm_clk_get(dev, "pclk"); 1845 if (IS_ERR(udc->iclk)) 1846 return PTR_ERR(udc->iclk); 1847 1848 udc->fclk = devm_clk_get(dev, "hclk"); 1849 if (IS_ERR(udc->fclk)) 1850 return PTR_ERR(udc->fclk); 1851 1852 /* don't do anything until we have both gadget driver and VBUS */ 1853 clk_set_rate(udc->fclk, 48000000); 1854 retval = clk_prepare(udc->fclk); 1855 if (retval) 1856 return retval; 1857 1858 retval = clk_prepare_enable(udc->iclk); 1859 if (retval) 1860 goto err_unprepare_fclk; 1861 1862 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 1863 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); 1864 /* Clear all pending interrupts - UDP may be used by bootloader. */ 1865 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); 1866 clk_disable(udc->iclk); 1867 1868 /* request UDC and maybe VBUS irqs */ 1869 udc->udp_irq = retval = platform_get_irq(pdev, 0); 1870 if (retval < 0) 1871 goto err_unprepare_iclk; 1872 retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0, 1873 driver_name, udc); 1874 if (retval) { 1875 DBG("request irq %d failed\n", udc->udp_irq); 1876 goto err_unprepare_iclk; 1877 } 1878 1879 if (udc->board.vbus_pin) { 1880 gpiod_direction_input(udc->board.vbus_pin); 1881 1882 /* 1883 * Get the initial state of VBUS - we cannot expect 1884 * a pending interrupt. 1885 */ 1886 udc->vbus = gpiod_get_value_cansleep(udc->board.vbus_pin); 1887 1888 if (udc->board.vbus_polled) { 1889 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work); 1890 timer_setup(&udc->vbus_timer, at91_vbus_timer, 0); 1891 mod_timer(&udc->vbus_timer, 1892 jiffies + VBUS_POLL_TIMEOUT); 1893 } else { 1894 retval = devm_request_irq(dev, 1895 gpiod_to_irq(udc->board.vbus_pin), 1896 at91_vbus_irq, 0, driver_name, udc); 1897 if (retval) { 1898 DBG("request vbus irq %d failed\n", 1899 desc_to_gpio(udc->board.vbus_pin)); 1900 goto err_unprepare_iclk; 1901 } 1902 } 1903 } else { 1904 DBG("no VBUS detection, assuming always-on\n"); 1905 udc->vbus = 1; 1906 } 1907 retval = usb_add_gadget_udc(dev, &udc->gadget); 1908 if (retval) 1909 goto err_unprepare_iclk; 1910 dev_set_drvdata(dev, udc); 1911 device_init_wakeup(dev, 1); 1912 create_debug_file(udc); 1913 1914 INFO("%s version %s\n", driver_name, DRIVER_VERSION); 1915 return 0; 1916 1917err_unprepare_iclk: 1918 clk_unprepare(udc->iclk); 1919err_unprepare_fclk: 1920 clk_unprepare(udc->fclk); 1921 1922 DBG("%s probe failed, %d\n", driver_name, retval); 1923 1924 return retval; 1925} 1926 1927static void at91udc_remove(struct platform_device *pdev) 1928{ 1929 struct at91_udc *udc = platform_get_drvdata(pdev); 1930 unsigned long flags; 1931 1932 DBG("remove\n"); 1933 1934 usb_del_gadget_udc(&udc->gadget); 1935 if (udc->driver) { 1936 dev_err(&pdev->dev, 1937 "Driver still in use but removing anyhow\n"); 1938 return; 1939 } 1940 1941 spin_lock_irqsave(&udc->lock, flags); 1942 pullup(udc, 0); 1943 spin_unlock_irqrestore(&udc->lock, flags); 1944 1945 device_init_wakeup(&pdev->dev, 0); 1946 remove_debug_file(udc); 1947 clk_unprepare(udc->fclk); 1948 clk_unprepare(udc->iclk); 1949} 1950 1951#ifdef CONFIG_PM 1952static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) 1953{ 1954 struct at91_udc *udc = platform_get_drvdata(pdev); 1955 int wake = udc->driver && device_may_wakeup(&pdev->dev); 1956 unsigned long flags; 1957 1958 /* Unless we can act normally to the host (letting it wake us up 1959 * whenever it has work for us) force disconnect. Wakeup requires 1960 * PLLB for USB events (signaling for reset, wakeup, or incoming 1961 * tokens) and VBUS irqs (on systems which support them). 1962 */ 1963 if ((!udc->suspended && udc->addr) 1964 || !wake 1965 || at91_suspend_entering_slow_clock()) { 1966 spin_lock_irqsave(&udc->lock, flags); 1967 pullup(udc, 0); 1968 wake = 0; 1969 spin_unlock_irqrestore(&udc->lock, flags); 1970 } else 1971 enable_irq_wake(udc->udp_irq); 1972 1973 udc->active_suspend = wake; 1974 if (udc->board.vbus_pin && !udc->board.vbus_polled && wake) 1975 enable_irq_wake(gpiod_to_irq(udc->board.vbus_pin)); 1976 return 0; 1977} 1978 1979static int at91udc_resume(struct platform_device *pdev) 1980{ 1981 struct at91_udc *udc = platform_get_drvdata(pdev); 1982 unsigned long flags; 1983 1984 if (udc->board.vbus_pin && !udc->board.vbus_polled && 1985 udc->active_suspend) 1986 disable_irq_wake(gpiod_to_irq(udc->board.vbus_pin)); 1987 1988 /* maybe reconnect to host; if so, clocks on */ 1989 if (udc->active_suspend) 1990 disable_irq_wake(udc->udp_irq); 1991 else { 1992 spin_lock_irqsave(&udc->lock, flags); 1993 pullup(udc, 1); 1994 spin_unlock_irqrestore(&udc->lock, flags); 1995 } 1996 return 0; 1997} 1998#else 1999#define at91udc_suspend NULL 2000#define at91udc_resume NULL 2001#endif 2002 2003static struct platform_driver at91_udc_driver = { 2004 .probe = at91udc_probe, 2005 .remove_new = at91udc_remove, 2006 .shutdown = at91udc_shutdown, 2007 .suspend = at91udc_suspend, 2008 .resume = at91udc_resume, 2009 .driver = { 2010 .name = driver_name, 2011 .of_match_table = at91_udc_dt_ids, 2012 }, 2013}; 2014 2015module_platform_driver(at91_udc_driver); 2016 2017MODULE_DESCRIPTION("AT91 udc driver"); 2018MODULE_AUTHOR("Thomas Rathbone, David Brownell"); 2019MODULE_LICENSE("GPL"); 2020MODULE_ALIAS("platform:at91_udc"); 2021