1/* 2 * at91_udc -- driver for at91-series USB peripheral controller 3 * 4 * Copyright (C) 2004 by Thomas Rathbone 5 * Copyright (C) 2005 by HP Labs 6 * Copyright (C) 2005 by David Brownell 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14#undef VERBOSE_DEBUG 15#undef PACKET_TRACE 16 17#include <linux/kernel.h> 18#include <linux/module.h> 19#include <linux/platform_device.h> 20#include <linux/delay.h> 21#include <linux/ioport.h> 22#include <linux/slab.h> 23#include <linux/errno.h> 24#include <linux/list.h> 25#include <linux/interrupt.h> 26#include <linux/proc_fs.h> 27#include <linux/prefetch.h> 28#include <linux/clk.h> 29#include <linux/usb/ch9.h> 30#include <linux/usb/gadget.h> 31#include <linux/of.h> 32#include <linux/of_gpio.h> 33#include <linux/platform_data/atmel.h> 34 35#include <asm/byteorder.h> 36#include <mach/hardware.h> 37#include <asm/io.h> 38#include <asm/irq.h> 39#include <asm/gpio.h> 40 41#include <mach/cpu.h> 42#include <mach/at91sam9261_matrix.h> 43#include <mach/at91_matrix.h> 44 45#include "at91_udc.h" 46 47 48/* 49 * This controller is simple and PIO-only. It's used in many AT91-series 50 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), 51 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. 52 * 53 * This driver expects the board has been wired with two GPIOs supporting 54 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the 55 * testing hasn't covered such cases.) 56 * 57 * The pullup is most important (so it's integrated on sam926x parts). It 58 * provides software control over whether the host enumerates the device. 59 * 60 * The VBUS sensing helps during enumeration, and allows both USB clocks 61 * (and the transceiver) to stay gated off until they're necessary, saving 62 * power. During USB suspend, the 48 MHz clock is gated off in hardware; 63 * it may also be gated off by software during some Linux sleep states. 64 */ 65 66#define DRIVER_VERSION "3 May 2006" 67 68static const char driver_name [] = "at91_udc"; 69static const char ep0name[] = "ep0"; 70 71#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000) 72 73#define at91_udp_read(udc, reg) \ 74 __raw_readl((udc)->udp_baseaddr + (reg)) 75#define at91_udp_write(udc, reg, val) \ 76 __raw_writel((val), (udc)->udp_baseaddr + (reg)) 77 78/*-------------------------------------------------------------------------*/ 79 80#ifdef CONFIG_USB_GADGET_DEBUG_FILES 81 82#include <linux/seq_file.h> 83 84static const char debug_filename[] = "driver/udc"; 85 86#define FOURBITS "%s%s%s%s" 87#define EIGHTBITS FOURBITS FOURBITS 88 89static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) 90{ 91 static char *types[] = { 92 "control", "out-iso", "out-bulk", "out-int", 93 "BOGUS", "in-iso", "in-bulk", "in-int"}; 94 95 u32 csr; 96 struct at91_request *req; 97 unsigned long flags; 98 struct at91_udc *udc = ep->udc; 99 100 spin_lock_irqsave(&udc->lock, flags); 101 102 csr = __raw_readl(ep->creg); 103 104 /* NOTE: not collecting per-endpoint irq statistics... */ 105 106 seq_printf(s, "\n"); 107 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", 108 ep->ep.name, ep->ep.maxpacket, 109 ep->is_in ? "in" : "out", 110 ep->is_iso ? " iso" : "", 111 ep->is_pingpong 112 ? (ep->fifo_bank ? "pong" : "ping") 113 : "", 114 ep->stopped ? " stopped" : ""); 115 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", 116 csr, 117 (csr & 0x07ff0000) >> 16, 118 (csr & (1 << 15)) ? "enabled" : "disabled", 119 (csr & (1 << 11)) ? "DATA1" : "DATA0", 120 types[(csr & 0x700) >> 8], 121 122 /* iff type is control then print current direction */ 123 (!(csr & 0x700)) 124 ? ((csr & (1 << 7)) ? " IN" : " OUT") 125 : "", 126 (csr & (1 << 6)) ? " rxdatabk1" : "", 127 (csr & (1 << 5)) ? " forcestall" : "", 128 (csr & (1 << 4)) ? " txpktrdy" : "", 129 130 (csr & (1 << 3)) ? " stallsent" : "", 131 (csr & (1 << 2)) ? " rxsetup" : "", 132 (csr & (1 << 1)) ? " rxdatabk0" : "", 133 (csr & (1 << 0)) ? " txcomp" : ""); 134 if (list_empty (&ep->queue)) 135 seq_printf(s, "\t(queue empty)\n"); 136 137 else list_for_each_entry (req, &ep->queue, queue) { 138 unsigned length = req->req.actual; 139 140 seq_printf(s, "\treq %p len %d/%d buf %p\n", 141 &req->req, length, 142 req->req.length, req->req.buf); 143 } 144 spin_unlock_irqrestore(&udc->lock, flags); 145} 146 147static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) 148{ 149 int i; 150 151 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, 152 (mask & (1 << 13)) ? " wakeup" : "", 153 (mask & (1 << 12)) ? " endbusres" : "", 154 155 (mask & (1 << 11)) ? " sofint" : "", 156 (mask & (1 << 10)) ? " extrsm" : "", 157 (mask & (1 << 9)) ? " rxrsm" : "", 158 (mask & (1 << 8)) ? " rxsusp" : ""); 159 for (i = 0; i < 8; i++) { 160 if (mask & (1 << i)) 161 seq_printf(s, " ep%d", i); 162 } 163 seq_printf(s, "\n"); 164} 165 166static int proc_udc_show(struct seq_file *s, void *unused) 167{ 168 struct at91_udc *udc = s->private; 169 struct at91_ep *ep; 170 u32 tmp; 171 172 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); 173 174 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", 175 udc->vbus ? "present" : "off", 176 udc->enabled 177 ? (udc->vbus ? "active" : "enabled") 178 : "disabled", 179 udc->selfpowered ? "self" : "VBUS", 180 udc->suspended ? ", suspended" : "", 181 udc->driver ? udc->driver->driver.name : "(none)"); 182 183 /* don't access registers when interface isn't clocked */ 184 if (!udc->clocked) { 185 seq_printf(s, "(not clocked)\n"); 186 return 0; 187 } 188 189 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM); 190 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, 191 (tmp & AT91_UDP_FRM_OK) ? " ok" : "", 192 (tmp & AT91_UDP_FRM_ERR) ? " err" : "", 193 (tmp & AT91_UDP_NUM)); 194 195 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 196 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, 197 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", 198 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", 199 (tmp & AT91_UDP_ESR) ? " esr" : "", 200 (tmp & AT91_UDP_CONFG) ? " confg" : "", 201 (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); 202 203 tmp = at91_udp_read(udc, AT91_UDP_FADDR); 204 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, 205 (tmp & AT91_UDP_FEN) ? " fen" : "", 206 (tmp & AT91_UDP_FADD)); 207 208 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR)); 209 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR)); 210 211 if (udc->enabled && udc->vbus) { 212 proc_ep_show(s, &udc->ep[0]); 213 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { 214 if (ep->ep.desc) 215 proc_ep_show(s, ep); 216 } 217 } 218 return 0; 219} 220 221static int proc_udc_open(struct inode *inode, struct file *file) 222{ 223 return single_open(file, proc_udc_show, PDE_DATA(inode)); 224} 225 226static const struct file_operations proc_ops = { 227 .owner = THIS_MODULE, 228 .open = proc_udc_open, 229 .read = seq_read, 230 .llseek = seq_lseek, 231 .release = single_release, 232}; 233 234static void create_debug_file(struct at91_udc *udc) 235{ 236 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc); 237} 238 239static void remove_debug_file(struct at91_udc *udc) 240{ 241 if (udc->pde) 242 remove_proc_entry(debug_filename, NULL); 243} 244 245#else 246 247static inline void create_debug_file(struct at91_udc *udc) {} 248static inline void remove_debug_file(struct at91_udc *udc) {} 249 250#endif 251 252 253/*-------------------------------------------------------------------------*/ 254 255static void done(struct at91_ep *ep, struct at91_request *req, int status) 256{ 257 unsigned stopped = ep->stopped; 258 struct at91_udc *udc = ep->udc; 259 260 list_del_init(&req->queue); 261 if (req->req.status == -EINPROGRESS) 262 req->req.status = status; 263 else 264 status = req->req.status; 265 if (status && status != -ESHUTDOWN) 266 VDBG("%s done %p, status %d\n", ep->ep.name, req, status); 267 268 ep->stopped = 1; 269 spin_unlock(&udc->lock); 270 usb_gadget_giveback_request(&ep->ep, &req->req); 271 spin_lock(&udc->lock); 272 ep->stopped = stopped; 273 274 /* ep0 is always ready; other endpoints need a non-empty queue */ 275 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) 276 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask); 277} 278 279/*-------------------------------------------------------------------------*/ 280 281/* bits indicating OUT fifo has data ready */ 282#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) 283 284/* 285 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write 286 * back most of the value you just read (because of side effects, including 287 * bits that may change after reading and before writing). 288 * 289 * Except when changing a specific bit, always write values which: 290 * - clear SET_FX bits (setting them could change something) 291 * - set CLR_FX bits (clearing them could change something) 292 * 293 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE 294 * that shouldn't normally be changed. 295 * 296 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, 297 * implying a need to wait for one write to complete (test relevant bits) 298 * before starting the next write. This shouldn't be an issue given how 299 * infrequently we write, except maybe for write-then-read idioms. 300 */ 301#define SET_FX (AT91_UDP_TXPKTRDY) 302#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ 303 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) 304 305/* pull OUT packet data from the endpoint's fifo */ 306static int read_fifo (struct at91_ep *ep, struct at91_request *req) 307{ 308 u32 __iomem *creg = ep->creg; 309 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 310 u32 csr; 311 u8 *buf; 312 unsigned int count, bufferspace, is_done; 313 314 buf = req->req.buf + req->req.actual; 315 bufferspace = req->req.length - req->req.actual; 316 317 /* 318 * there might be nothing to read if ep_queue() calls us, 319 * or if we already emptied both pingpong buffers 320 */ 321rescan: 322 csr = __raw_readl(creg); 323 if ((csr & RX_DATA_READY) == 0) 324 return 0; 325 326 count = (csr & AT91_UDP_RXBYTECNT) >> 16; 327 if (count > ep->ep.maxpacket) 328 count = ep->ep.maxpacket; 329 if (count > bufferspace) { 330 DBG("%s buffer overflow\n", ep->ep.name); 331 req->req.status = -EOVERFLOW; 332 count = bufferspace; 333 } 334 __raw_readsb(dreg, buf, count); 335 336 /* release and swap pingpong mem bank */ 337 csr |= CLR_FX; 338 if (ep->is_pingpong) { 339 if (ep->fifo_bank == 0) { 340 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 341 ep->fifo_bank = 1; 342 } else { 343 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); 344 ep->fifo_bank = 0; 345 } 346 } else 347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 348 __raw_writel(csr, creg); 349 350 req->req.actual += count; 351 is_done = (count < ep->ep.maxpacket); 352 if (count == bufferspace) 353 is_done = 1; 354 355 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, 356 is_done ? " (done)" : ""); 357 358 /* 359 * avoid extra trips through IRQ logic for packets already in 360 * the fifo ... maybe preventing an extra (expensive) OUT-NAK 361 */ 362 if (is_done) 363 done(ep, req, 0); 364 else if (ep->is_pingpong) { 365 /* 366 * One dummy read to delay the code because of a HW glitch: 367 * CSR returns bad RXCOUNT when read too soon after updating 368 * RX_DATA_BK flags. 369 */ 370 csr = __raw_readl(creg); 371 372 bufferspace -= count; 373 buf += count; 374 goto rescan; 375 } 376 377 return is_done; 378} 379 380/* load fifo for an IN packet */ 381static int write_fifo(struct at91_ep *ep, struct at91_request *req) 382{ 383 u32 __iomem *creg = ep->creg; 384 u32 csr = __raw_readl(creg); 385 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 386 unsigned total, count, is_last; 387 u8 *buf; 388 389 /* 390 * TODO: allow for writing two packets to the fifo ... that'll 391 * reduce the amount of IN-NAKing, but probably won't affect 392 * throughput much. (Unlike preventing OUT-NAKing!) 393 */ 394 395 /* 396 * If ep_queue() calls us, the queue is empty and possibly in 397 * odd states like TXCOMP not yet cleared (we do it, saving at 398 * least one IRQ) or the fifo not yet being free. Those aren't 399 * issues normally (IRQ handler fast path). 400 */ 401 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { 402 if (csr & AT91_UDP_TXCOMP) { 403 csr |= CLR_FX; 404 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 405 __raw_writel(csr, creg); 406 csr = __raw_readl(creg); 407 } 408 if (csr & AT91_UDP_TXPKTRDY) 409 return 0; 410 } 411 412 buf = req->req.buf + req->req.actual; 413 prefetch(buf); 414 total = req->req.length - req->req.actual; 415 if (ep->ep.maxpacket < total) { 416 count = ep->ep.maxpacket; 417 is_last = 0; 418 } else { 419 count = total; 420 is_last = (count < ep->ep.maxpacket) || !req->req.zero; 421 } 422 423 /* 424 * Write the packet, maybe it's a ZLP. 425 * 426 * NOTE: incrementing req->actual before we receive the ACK means 427 * gadget driver IN bytecounts can be wrong in fault cases. That's 428 * fixable with PIO drivers like this one (save "count" here, and 429 * do the increment later on TX irq), but not for most DMA hardware. 430 * 431 * So all gadget drivers must accept that potential error. Some 432 * hardware supports precise fifo status reporting, letting them 433 * recover when the actual bytecount matters (e.g. for USB Test 434 * and Measurement Class devices). 435 */ 436 __raw_writesb(dreg, buf, count); 437 csr &= ~SET_FX; 438 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 439 __raw_writel(csr, creg); 440 req->req.actual += count; 441 442 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, 443 is_last ? " (done)" : ""); 444 if (is_last) 445 done(ep, req, 0); 446 return is_last; 447} 448 449static void nuke(struct at91_ep *ep, int status) 450{ 451 struct at91_request *req; 452 453 /* terminate any request in the queue */ 454 ep->stopped = 1; 455 if (list_empty(&ep->queue)) 456 return; 457 458 VDBG("%s %s\n", __func__, ep->ep.name); 459 while (!list_empty(&ep->queue)) { 460 req = list_entry(ep->queue.next, struct at91_request, queue); 461 done(ep, req, status); 462 } 463} 464 465/*-------------------------------------------------------------------------*/ 466 467static int at91_ep_enable(struct usb_ep *_ep, 468 const struct usb_endpoint_descriptor *desc) 469{ 470 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 471 struct at91_udc *udc; 472 u16 maxpacket; 473 u32 tmp; 474 unsigned long flags; 475 476 if (!_ep || !ep 477 || !desc || _ep->name == ep0name 478 || desc->bDescriptorType != USB_DT_ENDPOINT 479 || (maxpacket = usb_endpoint_maxp(desc)) == 0 480 || maxpacket > ep->maxpacket) { 481 DBG("bad ep or descriptor\n"); 482 return -EINVAL; 483 } 484 485 udc = ep->udc; 486 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 487 DBG("bogus device state\n"); 488 return -ESHUTDOWN; 489 } 490 491 tmp = usb_endpoint_type(desc); 492 switch (tmp) { 493 case USB_ENDPOINT_XFER_CONTROL: 494 DBG("only one control endpoint\n"); 495 return -EINVAL; 496 case USB_ENDPOINT_XFER_INT: 497 if (maxpacket > 64) 498 goto bogus_max; 499 break; 500 case USB_ENDPOINT_XFER_BULK: 501 switch (maxpacket) { 502 case 8: 503 case 16: 504 case 32: 505 case 64: 506 goto ok; 507 } 508bogus_max: 509 DBG("bogus maxpacket %d\n", maxpacket); 510 return -EINVAL; 511 case USB_ENDPOINT_XFER_ISOC: 512 if (!ep->is_pingpong) { 513 DBG("iso requires double buffering\n"); 514 return -EINVAL; 515 } 516 break; 517 } 518 519ok: 520 spin_lock_irqsave(&udc->lock, flags); 521 522 /* initialize endpoint to match this descriptor */ 523 ep->is_in = usb_endpoint_dir_in(desc); 524 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); 525 ep->stopped = 0; 526 if (ep->is_in) 527 tmp |= 0x04; 528 tmp <<= 8; 529 tmp |= AT91_UDP_EPEDS; 530 __raw_writel(tmp, ep->creg); 531 532 ep->ep.maxpacket = maxpacket; 533 534 /* 535 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, 536 * since endpoint resets don't reset hw pingpong state. 537 */ 538 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 539 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 540 541 spin_unlock_irqrestore(&udc->lock, flags); 542 return 0; 543} 544 545static int at91_ep_disable (struct usb_ep * _ep) 546{ 547 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 548 struct at91_udc *udc = ep->udc; 549 unsigned long flags; 550 551 if (ep == &ep->udc->ep[0]) 552 return -EINVAL; 553 554 spin_lock_irqsave(&udc->lock, flags); 555 556 nuke(ep, -ESHUTDOWN); 557 558 /* restore the endpoint's pristine config */ 559 ep->ep.desc = NULL; 560 ep->ep.maxpacket = ep->maxpacket; 561 562 /* reset fifos and endpoint */ 563 if (ep->udc->clocked) { 564 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 565 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 566 __raw_writel(0, ep->creg); 567 } 568 569 spin_unlock_irqrestore(&udc->lock, flags); 570 return 0; 571} 572 573/* 574 * this is a PIO-only driver, so there's nothing 575 * interesting for request or buffer allocation. 576 */ 577 578static struct usb_request * 579at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 580{ 581 struct at91_request *req; 582 583 req = kzalloc(sizeof (struct at91_request), gfp_flags); 584 if (!req) 585 return NULL; 586 587 INIT_LIST_HEAD(&req->queue); 588 return &req->req; 589} 590 591static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) 592{ 593 struct at91_request *req; 594 595 req = container_of(_req, struct at91_request, req); 596 BUG_ON(!list_empty(&req->queue)); 597 kfree(req); 598} 599 600static int at91_ep_queue(struct usb_ep *_ep, 601 struct usb_request *_req, gfp_t gfp_flags) 602{ 603 struct at91_request *req; 604 struct at91_ep *ep; 605 struct at91_udc *udc; 606 int status; 607 unsigned long flags; 608 609 req = container_of(_req, struct at91_request, req); 610 ep = container_of(_ep, struct at91_ep, ep); 611 612 if (!_req || !_req->complete 613 || !_req->buf || !list_empty(&req->queue)) { 614 DBG("invalid request\n"); 615 return -EINVAL; 616 } 617 618 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) { 619 DBG("invalid ep\n"); 620 return -EINVAL; 621 } 622 623 udc = ep->udc; 624 625 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 626 DBG("invalid device\n"); 627 return -EINVAL; 628 } 629 630 _req->status = -EINPROGRESS; 631 _req->actual = 0; 632 633 spin_lock_irqsave(&udc->lock, flags); 634 635 /* try to kickstart any empty and idle queue */ 636 if (list_empty(&ep->queue) && !ep->stopped) { 637 int is_ep0; 638 639 /* 640 * If this control request has a non-empty DATA stage, this 641 * will start that stage. It works just like a non-control 642 * request (until the status stage starts, maybe early). 643 * 644 * If the data stage is empty, then this starts a successful 645 * IN/STATUS stage. (Unsuccessful ones use set_halt.) 646 */ 647 is_ep0 = (ep->ep.name == ep0name); 648 if (is_ep0) { 649 u32 tmp; 650 651 if (!udc->req_pending) { 652 status = -EINVAL; 653 goto done; 654 } 655 656 /* 657 * defer changing CONFG until after the gadget driver 658 * reconfigures the endpoints. 659 */ 660 if (udc->wait_for_config_ack) { 661 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 662 tmp ^= AT91_UDP_CONFG; 663 VDBG("toggle config\n"); 664 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 665 } 666 if (req->req.length == 0) { 667ep0_in_status: 668 PACKET("ep0 in/status\n"); 669 status = 0; 670 tmp = __raw_readl(ep->creg); 671 tmp &= ~SET_FX; 672 tmp |= CLR_FX | AT91_UDP_TXPKTRDY; 673 __raw_writel(tmp, ep->creg); 674 udc->req_pending = 0; 675 goto done; 676 } 677 } 678 679 if (ep->is_in) 680 status = write_fifo(ep, req); 681 else { 682 status = read_fifo(ep, req); 683 684 /* IN/STATUS stage is otherwise triggered by irq */ 685 if (status && is_ep0) 686 goto ep0_in_status; 687 } 688 } else 689 status = 0; 690 691 if (req && !status) { 692 list_add_tail (&req->queue, &ep->queue); 693 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask); 694 } 695done: 696 spin_unlock_irqrestore(&udc->lock, flags); 697 return (status < 0) ? status : 0; 698} 699 700static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 701{ 702 struct at91_ep *ep; 703 struct at91_request *req; 704 unsigned long flags; 705 struct at91_udc *udc; 706 707 ep = container_of(_ep, struct at91_ep, ep); 708 if (!_ep || ep->ep.name == ep0name) 709 return -EINVAL; 710 711 udc = ep->udc; 712 713 spin_lock_irqsave(&udc->lock, flags); 714 715 /* make sure it's actually queued on this endpoint */ 716 list_for_each_entry (req, &ep->queue, queue) { 717 if (&req->req == _req) 718 break; 719 } 720 if (&req->req != _req) { 721 spin_unlock_irqrestore(&udc->lock, flags); 722 return -EINVAL; 723 } 724 725 done(ep, req, -ECONNRESET); 726 spin_unlock_irqrestore(&udc->lock, flags); 727 return 0; 728} 729 730static int at91_ep_set_halt(struct usb_ep *_ep, int value) 731{ 732 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 733 struct at91_udc *udc = ep->udc; 734 u32 __iomem *creg; 735 u32 csr; 736 unsigned long flags; 737 int status = 0; 738 739 if (!_ep || ep->is_iso || !ep->udc->clocked) 740 return -EINVAL; 741 742 creg = ep->creg; 743 spin_lock_irqsave(&udc->lock, flags); 744 745 csr = __raw_readl(creg); 746 747 /* 748 * fail with still-busy IN endpoints, ensuring correct sequencing 749 * of data tx then stall. note that the fifo rx bytecount isn't 750 * completely accurate as a tx bytecount. 751 */ 752 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) 753 status = -EAGAIN; 754 else { 755 csr |= CLR_FX; 756 csr &= ~SET_FX; 757 if (value) { 758 csr |= AT91_UDP_FORCESTALL; 759 VDBG("halt %s\n", ep->ep.name); 760 } else { 761 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 762 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 763 csr &= ~AT91_UDP_FORCESTALL; 764 } 765 __raw_writel(csr, creg); 766 } 767 768 spin_unlock_irqrestore(&udc->lock, flags); 769 return status; 770} 771 772static const struct usb_ep_ops at91_ep_ops = { 773 .enable = at91_ep_enable, 774 .disable = at91_ep_disable, 775 .alloc_request = at91_ep_alloc_request, 776 .free_request = at91_ep_free_request, 777 .queue = at91_ep_queue, 778 .dequeue = at91_ep_dequeue, 779 .set_halt = at91_ep_set_halt, 780 /* there's only imprecise fifo status reporting */ 781}; 782 783/*-------------------------------------------------------------------------*/ 784 785static int at91_get_frame(struct usb_gadget *gadget) 786{ 787 struct at91_udc *udc = to_udc(gadget); 788 789 if (!to_udc(gadget)->clocked) 790 return -EINVAL; 791 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; 792} 793 794static int at91_wakeup(struct usb_gadget *gadget) 795{ 796 struct at91_udc *udc = to_udc(gadget); 797 u32 glbstate; 798 int status = -EINVAL; 799 unsigned long flags; 800 801 DBG("%s\n", __func__ ); 802 spin_lock_irqsave(&udc->lock, flags); 803 804 if (!udc->clocked || !udc->suspended) 805 goto done; 806 807 /* NOTE: some "early versions" handle ESR differently ... */ 808 809 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); 810 if (!(glbstate & AT91_UDP_ESR)) 811 goto done; 812 glbstate |= AT91_UDP_ESR; 813 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); 814 815done: 816 spin_unlock_irqrestore(&udc->lock, flags); 817 return status; 818} 819 820/* reinit == restore initial software state */ 821static void udc_reinit(struct at91_udc *udc) 822{ 823 u32 i; 824 825 INIT_LIST_HEAD(&udc->gadget.ep_list); 826 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); 827 828 for (i = 0; i < NUM_ENDPOINTS; i++) { 829 struct at91_ep *ep = &udc->ep[i]; 830 831 if (i != 0) 832 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 833 ep->ep.desc = NULL; 834 ep->stopped = 0; 835 ep->fifo_bank = 0; 836 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 837 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); 838 /* initialize one queue per endpoint */ 839 INIT_LIST_HEAD(&ep->queue); 840 } 841} 842 843static void stop_activity(struct at91_udc *udc) 844{ 845 struct usb_gadget_driver *driver = udc->driver; 846 int i; 847 848 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 849 driver = NULL; 850 udc->gadget.speed = USB_SPEED_UNKNOWN; 851 udc->suspended = 0; 852 853 for (i = 0; i < NUM_ENDPOINTS; i++) { 854 struct at91_ep *ep = &udc->ep[i]; 855 ep->stopped = 1; 856 nuke(ep, -ESHUTDOWN); 857 } 858 if (driver) { 859 spin_unlock(&udc->lock); 860 driver->disconnect(&udc->gadget); 861 spin_lock(&udc->lock); 862 } 863 864 udc_reinit(udc); 865} 866 867static void clk_on(struct at91_udc *udc) 868{ 869 if (udc->clocked) 870 return; 871 udc->clocked = 1; 872 873 if (IS_ENABLED(CONFIG_COMMON_CLK)) { 874 clk_set_rate(udc->uclk, 48000000); 875 clk_prepare_enable(udc->uclk); 876 } 877 clk_prepare_enable(udc->iclk); 878 clk_prepare_enable(udc->fclk); 879} 880 881static void clk_off(struct at91_udc *udc) 882{ 883 if (!udc->clocked) 884 return; 885 udc->clocked = 0; 886 udc->gadget.speed = USB_SPEED_UNKNOWN; 887 clk_disable_unprepare(udc->fclk); 888 clk_disable_unprepare(udc->iclk); 889 if (IS_ENABLED(CONFIG_COMMON_CLK)) 890 clk_disable_unprepare(udc->uclk); 891} 892 893/* 894 * activate/deactivate link with host; minimize power usage for 895 * inactive links by cutting clocks and transceiver power. 896 */ 897static void pullup(struct at91_udc *udc, int is_on) 898{ 899 int active = !udc->board.pullup_active_low; 900 901 if (!udc->enabled || !udc->vbus) 902 is_on = 0; 903 DBG("%sactive\n", is_on ? "" : "in"); 904 905 if (is_on) { 906 clk_on(udc); 907 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 908 at91_udp_write(udc, AT91_UDP_TXVC, 0); 909 if (cpu_is_at91rm9200()) 910 gpio_set_value(udc->board.pullup_pin, active); 911 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) { 912 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 913 914 txvc |= AT91_UDP_TXVC_PUON; 915 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 916 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) { 917 u32 usbpucr; 918 919 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR); 920 usbpucr |= AT91_MATRIX_USBPUCR_PUON; 921 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr); 922 } 923 } else { 924 stop_activity(udc); 925 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 926 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 927 if (cpu_is_at91rm9200()) 928 gpio_set_value(udc->board.pullup_pin, !active); 929 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) { 930 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 931 932 txvc &= ~AT91_UDP_TXVC_PUON; 933 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 934 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) { 935 u32 usbpucr; 936 937 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR); 938 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON; 939 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr); 940 } 941 clk_off(udc); 942 } 943} 944 945/* vbus is here! turn everything on that's ready */ 946static int at91_vbus_session(struct usb_gadget *gadget, int is_active) 947{ 948 struct at91_udc *udc = to_udc(gadget); 949 unsigned long flags; 950 951 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ 952 spin_lock_irqsave(&udc->lock, flags); 953 udc->vbus = (is_active != 0); 954 if (udc->driver) 955 pullup(udc, is_active); 956 else 957 pullup(udc, 0); 958 spin_unlock_irqrestore(&udc->lock, flags); 959 return 0; 960} 961 962static int at91_pullup(struct usb_gadget *gadget, int is_on) 963{ 964 struct at91_udc *udc = to_udc(gadget); 965 unsigned long flags; 966 967 spin_lock_irqsave(&udc->lock, flags); 968 udc->enabled = is_on = !!is_on; 969 pullup(udc, is_on); 970 spin_unlock_irqrestore(&udc->lock, flags); 971 return 0; 972} 973 974static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) 975{ 976 struct at91_udc *udc = to_udc(gadget); 977 unsigned long flags; 978 979 spin_lock_irqsave(&udc->lock, flags); 980 udc->selfpowered = (is_on != 0); 981 spin_unlock_irqrestore(&udc->lock, flags); 982 return 0; 983} 984 985static int at91_start(struct usb_gadget *gadget, 986 struct usb_gadget_driver *driver); 987static int at91_stop(struct usb_gadget *gadget, 988 struct usb_gadget_driver *driver); 989static const struct usb_gadget_ops at91_udc_ops = { 990 .get_frame = at91_get_frame, 991 .wakeup = at91_wakeup, 992 .set_selfpowered = at91_set_selfpowered, 993 .vbus_session = at91_vbus_session, 994 .pullup = at91_pullup, 995 .udc_start = at91_start, 996 .udc_stop = at91_stop, 997 998 /* 999 * VBUS-powered devices may also also want to support bigger 1000 * power budgets after an appropriate SET_CONFIGURATION. 1001 */ 1002 /* .vbus_power = at91_vbus_power, */ 1003}; 1004 1005/*-------------------------------------------------------------------------*/ 1006 1007static int handle_ep(struct at91_ep *ep) 1008{ 1009 struct at91_request *req; 1010 u32 __iomem *creg = ep->creg; 1011 u32 csr = __raw_readl(creg); 1012 1013 if (!list_empty(&ep->queue)) 1014 req = list_entry(ep->queue.next, 1015 struct at91_request, queue); 1016 else 1017 req = NULL; 1018 1019 if (ep->is_in) { 1020 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { 1021 csr |= CLR_FX; 1022 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); 1023 __raw_writel(csr, creg); 1024 } 1025 if (req) 1026 return write_fifo(ep, req); 1027 1028 } else { 1029 if (csr & AT91_UDP_STALLSENT) { 1030 /* STALLSENT bit == ISOERR */ 1031 if (ep->is_iso && req) 1032 req->req.status = -EILSEQ; 1033 csr |= CLR_FX; 1034 csr &= ~(SET_FX | AT91_UDP_STALLSENT); 1035 __raw_writel(csr, creg); 1036 csr = __raw_readl(creg); 1037 } 1038 if (req && (csr & RX_DATA_READY)) 1039 return read_fifo(ep, req); 1040 } 1041 return 0; 1042} 1043 1044union setup { 1045 u8 raw[8]; 1046 struct usb_ctrlrequest r; 1047}; 1048 1049static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) 1050{ 1051 u32 __iomem *creg = ep->creg; 1052 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 1053 unsigned rxcount, i = 0; 1054 u32 tmp; 1055 union setup pkt; 1056 int status = 0; 1057 1058 /* read and ack SETUP; hard-fail for bogus packets */ 1059 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; 1060 if (likely(rxcount == 8)) { 1061 while (rxcount--) 1062 pkt.raw[i++] = __raw_readb(dreg); 1063 if (pkt.r.bRequestType & USB_DIR_IN) { 1064 csr |= AT91_UDP_DIR; 1065 ep->is_in = 1; 1066 } else { 1067 csr &= ~AT91_UDP_DIR; 1068 ep->is_in = 0; 1069 } 1070 } else { 1071 /* REVISIT this happens sometimes under load; why?? */ 1072 ERR("SETUP len %d, csr %08x\n", rxcount, csr); 1073 status = -EINVAL; 1074 } 1075 csr |= CLR_FX; 1076 csr &= ~(SET_FX | AT91_UDP_RXSETUP); 1077 __raw_writel(csr, creg); 1078 udc->wait_for_addr_ack = 0; 1079 udc->wait_for_config_ack = 0; 1080 ep->stopped = 0; 1081 if (unlikely(status != 0)) 1082 goto stall; 1083 1084#define w_index le16_to_cpu(pkt.r.wIndex) 1085#define w_value le16_to_cpu(pkt.r.wValue) 1086#define w_length le16_to_cpu(pkt.r.wLength) 1087 1088 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 1089 pkt.r.bRequestType, pkt.r.bRequest, 1090 w_value, w_index, w_length); 1091 1092 /* 1093 * A few standard requests get handled here, ones that touch 1094 * hardware ... notably for device and endpoint features. 1095 */ 1096 udc->req_pending = 1; 1097 csr = __raw_readl(creg); 1098 csr |= CLR_FX; 1099 csr &= ~SET_FX; 1100 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { 1101 1102 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1103 | USB_REQ_SET_ADDRESS: 1104 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); 1105 udc->addr = w_value; 1106 udc->wait_for_addr_ack = 1; 1107 udc->req_pending = 0; 1108 /* FADDR is set later, when we ack host STATUS */ 1109 return; 1110 1111 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1112 | USB_REQ_SET_CONFIGURATION: 1113 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; 1114 if (pkt.r.wValue) 1115 udc->wait_for_config_ack = (tmp == 0); 1116 else 1117 udc->wait_for_config_ack = (tmp != 0); 1118 if (udc->wait_for_config_ack) 1119 VDBG("wait for config\n"); 1120 /* CONFG is toggled later, if gadget driver succeeds */ 1121 break; 1122 1123 /* 1124 * Hosts may set or clear remote wakeup status, and 1125 * devices may report they're VBUS powered. 1126 */ 1127 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1128 | USB_REQ_GET_STATUS: 1129 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); 1130 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) 1131 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); 1132 PACKET("get device status\n"); 1133 __raw_writeb(tmp, dreg); 1134 __raw_writeb(0, dreg); 1135 goto write_in; 1136 /* then STATUS starts later, automatically */ 1137 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1138 | USB_REQ_SET_FEATURE: 1139 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1140 goto stall; 1141 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1142 tmp |= AT91_UDP_ESR; 1143 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1144 goto succeed; 1145 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1146 | USB_REQ_CLEAR_FEATURE: 1147 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1148 goto stall; 1149 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1150 tmp &= ~AT91_UDP_ESR; 1151 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1152 goto succeed; 1153 1154 /* 1155 * Interfaces have no feature settings; this is pretty useless. 1156 * we won't even insist the interface exists... 1157 */ 1158 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1159 | USB_REQ_GET_STATUS: 1160 PACKET("get interface status\n"); 1161 __raw_writeb(0, dreg); 1162 __raw_writeb(0, dreg); 1163 goto write_in; 1164 /* then STATUS starts later, automatically */ 1165 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1166 | USB_REQ_SET_FEATURE: 1167 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1168 | USB_REQ_CLEAR_FEATURE: 1169 goto stall; 1170 1171 /* 1172 * Hosts may clear bulk/intr endpoint halt after the gadget 1173 * driver sets it (not widely used); or set it (for testing) 1174 */ 1175 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1176 | USB_REQ_GET_STATUS: 1177 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1178 ep = &udc->ep[tmp]; 1179 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc)) 1180 goto stall; 1181 1182 if (tmp) { 1183 if ((w_index & USB_DIR_IN)) { 1184 if (!ep->is_in) 1185 goto stall; 1186 } else if (ep->is_in) 1187 goto stall; 1188 } 1189 PACKET("get %s status\n", ep->ep.name); 1190 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) 1191 tmp = (1 << USB_ENDPOINT_HALT); 1192 else 1193 tmp = 0; 1194 __raw_writeb(tmp, dreg); 1195 __raw_writeb(0, dreg); 1196 goto write_in; 1197 /* then STATUS starts later, automatically */ 1198 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1199 | USB_REQ_SET_FEATURE: 1200 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1201 ep = &udc->ep[tmp]; 1202 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1203 goto stall; 1204 if (!ep->ep.desc || ep->is_iso) 1205 goto stall; 1206 if ((w_index & USB_DIR_IN)) { 1207 if (!ep->is_in) 1208 goto stall; 1209 } else if (ep->is_in) 1210 goto stall; 1211 1212 tmp = __raw_readl(ep->creg); 1213 tmp &= ~SET_FX; 1214 tmp |= CLR_FX | AT91_UDP_FORCESTALL; 1215 __raw_writel(tmp, ep->creg); 1216 goto succeed; 1217 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1218 | USB_REQ_CLEAR_FEATURE: 1219 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1220 ep = &udc->ep[tmp]; 1221 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1222 goto stall; 1223 if (tmp == 0) 1224 goto succeed; 1225 if (!ep->ep.desc || ep->is_iso) 1226 goto stall; 1227 if ((w_index & USB_DIR_IN)) { 1228 if (!ep->is_in) 1229 goto stall; 1230 } else if (ep->is_in) 1231 goto stall; 1232 1233 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 1234 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 1235 tmp = __raw_readl(ep->creg); 1236 tmp |= CLR_FX; 1237 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); 1238 __raw_writel(tmp, ep->creg); 1239 if (!list_empty(&ep->queue)) 1240 handle_ep(ep); 1241 goto succeed; 1242 } 1243 1244#undef w_value 1245#undef w_index 1246#undef w_length 1247 1248 /* pass request up to the gadget driver */ 1249 if (udc->driver) { 1250 spin_unlock(&udc->lock); 1251 status = udc->driver->setup(&udc->gadget, &pkt.r); 1252 spin_lock(&udc->lock); 1253 } 1254 else 1255 status = -ENODEV; 1256 if (status < 0) { 1257stall: 1258 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1259 pkt.r.bRequestType, pkt.r.bRequest, status); 1260 csr |= AT91_UDP_FORCESTALL; 1261 __raw_writel(csr, creg); 1262 udc->req_pending = 0; 1263 } 1264 return; 1265 1266succeed: 1267 /* immediate successful (IN) STATUS after zero length DATA */ 1268 PACKET("ep0 in/status\n"); 1269write_in: 1270 csr |= AT91_UDP_TXPKTRDY; 1271 __raw_writel(csr, creg); 1272 udc->req_pending = 0; 1273} 1274 1275static void handle_ep0(struct at91_udc *udc) 1276{ 1277 struct at91_ep *ep0 = &udc->ep[0]; 1278 u32 __iomem *creg = ep0->creg; 1279 u32 csr = __raw_readl(creg); 1280 struct at91_request *req; 1281 1282 if (unlikely(csr & AT91_UDP_STALLSENT)) { 1283 nuke(ep0, -EPROTO); 1284 udc->req_pending = 0; 1285 csr |= CLR_FX; 1286 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); 1287 __raw_writel(csr, creg); 1288 VDBG("ep0 stalled\n"); 1289 csr = __raw_readl(creg); 1290 } 1291 if (csr & AT91_UDP_RXSETUP) { 1292 nuke(ep0, 0); 1293 udc->req_pending = 0; 1294 handle_setup(udc, ep0, csr); 1295 return; 1296 } 1297 1298 if (list_empty(&ep0->queue)) 1299 req = NULL; 1300 else 1301 req = list_entry(ep0->queue.next, struct at91_request, queue); 1302 1303 /* host ACKed an IN packet that we sent */ 1304 if (csr & AT91_UDP_TXCOMP) { 1305 csr |= CLR_FX; 1306 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 1307 1308 /* write more IN DATA? */ 1309 if (req && ep0->is_in) { 1310 if (handle_ep(ep0)) 1311 udc->req_pending = 0; 1312 1313 /* 1314 * Ack after: 1315 * - last IN DATA packet (including GET_STATUS) 1316 * - IN/STATUS for OUT DATA 1317 * - IN/STATUS for any zero-length DATA stage 1318 * except for the IN DATA case, the host should send 1319 * an OUT status later, which we'll ack. 1320 */ 1321 } else { 1322 udc->req_pending = 0; 1323 __raw_writel(csr, creg); 1324 1325 /* 1326 * SET_ADDRESS takes effect only after the STATUS 1327 * (to the original address) gets acked. 1328 */ 1329 if (udc->wait_for_addr_ack) { 1330 u32 tmp; 1331 1332 at91_udp_write(udc, AT91_UDP_FADDR, 1333 AT91_UDP_FEN | udc->addr); 1334 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1335 tmp &= ~AT91_UDP_FADDEN; 1336 if (udc->addr) 1337 tmp |= AT91_UDP_FADDEN; 1338 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1339 1340 udc->wait_for_addr_ack = 0; 1341 VDBG("address %d\n", udc->addr); 1342 } 1343 } 1344 } 1345 1346 /* OUT packet arrived ... */ 1347 else if (csr & AT91_UDP_RX_DATA_BK0) { 1348 csr |= CLR_FX; 1349 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 1350 1351 /* OUT DATA stage */ 1352 if (!ep0->is_in) { 1353 if (req) { 1354 if (handle_ep(ep0)) { 1355 /* send IN/STATUS */ 1356 PACKET("ep0 in/status\n"); 1357 csr = __raw_readl(creg); 1358 csr &= ~SET_FX; 1359 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 1360 __raw_writel(csr, creg); 1361 udc->req_pending = 0; 1362 } 1363 } else if (udc->req_pending) { 1364 /* 1365 * AT91 hardware has a hard time with this 1366 * "deferred response" mode for control-OUT 1367 * transfers. (For control-IN it's fine.) 1368 * 1369 * The normal solution leaves OUT data in the 1370 * fifo until the gadget driver is ready. 1371 * We couldn't do that here without disabling 1372 * the IRQ that tells about SETUP packets, 1373 * e.g. when the host gets impatient... 1374 * 1375 * Working around it by copying into a buffer 1376 * would almost be a non-deferred response, 1377 * except that it wouldn't permit reliable 1378 * stalling of the request. Instead, demand 1379 * that gadget drivers not use this mode. 1380 */ 1381 DBG("no control-OUT deferred responses!\n"); 1382 __raw_writel(csr | AT91_UDP_FORCESTALL, creg); 1383 udc->req_pending = 0; 1384 } 1385 1386 /* STATUS stage for control-IN; ack. */ 1387 } else { 1388 PACKET("ep0 out/status ACK\n"); 1389 __raw_writel(csr, creg); 1390 1391 /* "early" status stage */ 1392 if (req) 1393 done(ep0, req, 0); 1394 } 1395 } 1396} 1397 1398static irqreturn_t at91_udc_irq (int irq, void *_udc) 1399{ 1400 struct at91_udc *udc = _udc; 1401 u32 rescans = 5; 1402 int disable_clock = 0; 1403 unsigned long flags; 1404 1405 spin_lock_irqsave(&udc->lock, flags); 1406 1407 if (!udc->clocked) { 1408 clk_on(udc); 1409 disable_clock = 1; 1410 } 1411 1412 while (rescans--) { 1413 u32 status; 1414 1415 status = at91_udp_read(udc, AT91_UDP_ISR) 1416 & at91_udp_read(udc, AT91_UDP_IMR); 1417 if (!status) 1418 break; 1419 1420 /* USB reset irq: not maskable */ 1421 if (status & AT91_UDP_ENDBUSRES) { 1422 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); 1423 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS); 1424 /* Atmel code clears this irq twice */ 1425 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1426 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1427 VDBG("end bus reset\n"); 1428 udc->addr = 0; 1429 stop_activity(udc); 1430 1431 /* enable ep0 */ 1432 at91_udp_write(udc, AT91_UDP_CSR(0), 1433 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); 1434 udc->gadget.speed = USB_SPEED_FULL; 1435 udc->suspended = 0; 1436 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0)); 1437 1438 /* 1439 * NOTE: this driver keeps clocks off unless the 1440 * USB host is present. That saves power, but for 1441 * boards that don't support VBUS detection, both 1442 * clocks need to be active most of the time. 1443 */ 1444 1445 /* host initiated suspend (3+ms bus idle) */ 1446 } else if (status & AT91_UDP_RXSUSP) { 1447 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); 1448 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); 1449 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); 1450 /* VDBG("bus suspend\n"); */ 1451 if (udc->suspended) 1452 continue; 1453 udc->suspended = 1; 1454 1455 /* 1456 * NOTE: when suspending a VBUS-powered device, the 1457 * gadget driver should switch into slow clock mode 1458 * and then into standby to avoid drawing more than 1459 * 500uA power (2500uA for some high-power configs). 1460 */ 1461 if (udc->driver && udc->driver->suspend) { 1462 spin_unlock(&udc->lock); 1463 udc->driver->suspend(&udc->gadget); 1464 spin_lock(&udc->lock); 1465 } 1466 1467 /* host initiated resume */ 1468 } else if (status & AT91_UDP_RXRSM) { 1469 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 1470 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP); 1471 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 1472 /* VDBG("bus resume\n"); */ 1473 if (!udc->suspended) 1474 continue; 1475 udc->suspended = 0; 1476 1477 /* 1478 * NOTE: for a VBUS-powered device, the gadget driver 1479 * would normally want to switch out of slow clock 1480 * mode into normal mode. 1481 */ 1482 if (udc->driver && udc->driver->resume) { 1483 spin_unlock(&udc->lock); 1484 udc->driver->resume(&udc->gadget); 1485 spin_lock(&udc->lock); 1486 } 1487 1488 /* endpoint IRQs are cleared by handling them */ 1489 } else { 1490 int i; 1491 unsigned mask = 1; 1492 struct at91_ep *ep = &udc->ep[1]; 1493 1494 if (status & mask) 1495 handle_ep0(udc); 1496 for (i = 1; i < NUM_ENDPOINTS; i++) { 1497 mask <<= 1; 1498 if (status & mask) 1499 handle_ep(ep); 1500 ep++; 1501 } 1502 } 1503 } 1504 1505 if (disable_clock) 1506 clk_off(udc); 1507 1508 spin_unlock_irqrestore(&udc->lock, flags); 1509 1510 return IRQ_HANDLED; 1511} 1512 1513/*-------------------------------------------------------------------------*/ 1514 1515static void nop_release(struct device *dev) 1516{ 1517 /* nothing to free */ 1518} 1519 1520static struct at91_udc controller = { 1521 .gadget = { 1522 .ops = &at91_udc_ops, 1523 .ep0 = &controller.ep[0].ep, 1524 .name = driver_name, 1525 .dev = { 1526 .init_name = "gadget", 1527 .release = nop_release, 1528 } 1529 }, 1530 .ep[0] = { 1531 .ep = { 1532 .name = ep0name, 1533 .ops = &at91_ep_ops, 1534 }, 1535 .udc = &controller, 1536 .maxpacket = 8, 1537 .int_mask = 1 << 0, 1538 }, 1539 .ep[1] = { 1540 .ep = { 1541 .name = "ep1", 1542 .ops = &at91_ep_ops, 1543 }, 1544 .udc = &controller, 1545 .is_pingpong = 1, 1546 .maxpacket = 64, 1547 .int_mask = 1 << 1, 1548 }, 1549 .ep[2] = { 1550 .ep = { 1551 .name = "ep2", 1552 .ops = &at91_ep_ops, 1553 }, 1554 .udc = &controller, 1555 .is_pingpong = 1, 1556 .maxpacket = 64, 1557 .int_mask = 1 << 2, 1558 }, 1559 .ep[3] = { 1560 .ep = { 1561 /* could actually do bulk too */ 1562 .name = "ep3-int", 1563 .ops = &at91_ep_ops, 1564 }, 1565 .udc = &controller, 1566 .maxpacket = 8, 1567 .int_mask = 1 << 3, 1568 }, 1569 .ep[4] = { 1570 .ep = { 1571 .name = "ep4", 1572 .ops = &at91_ep_ops, 1573 }, 1574 .udc = &controller, 1575 .is_pingpong = 1, 1576 .maxpacket = 256, 1577 .int_mask = 1 << 4, 1578 }, 1579 .ep[5] = { 1580 .ep = { 1581 .name = "ep5", 1582 .ops = &at91_ep_ops, 1583 }, 1584 .udc = &controller, 1585 .is_pingpong = 1, 1586 .maxpacket = 256, 1587 .int_mask = 1 << 5, 1588 }, 1589 /* ep6 and ep7 are also reserved (custom silicon might use them) */ 1590}; 1591 1592static void at91_vbus_update(struct at91_udc *udc, unsigned value) 1593{ 1594 value ^= udc->board.vbus_active_low; 1595 if (value != udc->vbus) 1596 at91_vbus_session(&udc->gadget, value); 1597} 1598 1599static irqreturn_t at91_vbus_irq(int irq, void *_udc) 1600{ 1601 struct at91_udc *udc = _udc; 1602 1603 /* vbus needs at least brief debouncing */ 1604 udelay(10); 1605 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin)); 1606 1607 return IRQ_HANDLED; 1608} 1609 1610static void at91_vbus_timer_work(struct work_struct *work) 1611{ 1612 struct at91_udc *udc = container_of(work, struct at91_udc, 1613 vbus_timer_work); 1614 1615 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin)); 1616 1617 if (!timer_pending(&udc->vbus_timer)) 1618 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT); 1619} 1620 1621static void at91_vbus_timer(unsigned long data) 1622{ 1623 struct at91_udc *udc = (struct at91_udc *)data; 1624 1625 /* 1626 * If we are polling vbus it is likely that the gpio is on an 1627 * bus such as i2c or spi which may sleep, so schedule some work 1628 * to read the vbus gpio 1629 */ 1630 schedule_work(&udc->vbus_timer_work); 1631} 1632 1633static int at91_start(struct usb_gadget *gadget, 1634 struct usb_gadget_driver *driver) 1635{ 1636 struct at91_udc *udc; 1637 1638 udc = container_of(gadget, struct at91_udc, gadget); 1639 udc->driver = driver; 1640 udc->gadget.dev.of_node = udc->pdev->dev.of_node; 1641 udc->enabled = 1; 1642 udc->selfpowered = 1; 1643 1644 DBG("bound to %s\n", driver->driver.name); 1645 return 0; 1646} 1647 1648static int at91_stop(struct usb_gadget *gadget, 1649 struct usb_gadget_driver *driver) 1650{ 1651 struct at91_udc *udc; 1652 unsigned long flags; 1653 1654 udc = container_of(gadget, struct at91_udc, gadget); 1655 spin_lock_irqsave(&udc->lock, flags); 1656 udc->enabled = 0; 1657 at91_udp_write(udc, AT91_UDP_IDR, ~0); 1658 spin_unlock_irqrestore(&udc->lock, flags); 1659 1660 udc->driver = NULL; 1661 1662 DBG("unbound from %s\n", driver->driver.name); 1663 return 0; 1664} 1665 1666/*-------------------------------------------------------------------------*/ 1667 1668static void at91udc_shutdown(struct platform_device *dev) 1669{ 1670 struct at91_udc *udc = platform_get_drvdata(dev); 1671 unsigned long flags; 1672 1673 /* force disconnect on reboot */ 1674 spin_lock_irqsave(&udc->lock, flags); 1675 pullup(platform_get_drvdata(dev), 0); 1676 spin_unlock_irqrestore(&udc->lock, flags); 1677} 1678 1679static void at91udc_of_init(struct at91_udc *udc, 1680 struct device_node *np) 1681{ 1682 struct at91_udc_data *board = &udc->board; 1683 u32 val; 1684 enum of_gpio_flags flags; 1685 1686 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0) 1687 board->vbus_polled = 1; 1688 1689 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0, 1690 &flags); 1691 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1692 1693 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0, 1694 &flags); 1695 1696 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1697} 1698 1699static int at91udc_probe(struct platform_device *pdev) 1700{ 1701 struct device *dev = &pdev->dev; 1702 struct at91_udc *udc; 1703 int retval; 1704 struct resource *res; 1705 1706 if (!dev_get_platdata(dev) && !pdev->dev.of_node) { 1707 /* small (so we copy it) but critical! */ 1708 DBG("missing platform_data\n"); 1709 return -ENODEV; 1710 } 1711 1712 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1713 if (!res) 1714 return -ENXIO; 1715 1716 if (!request_mem_region(res->start, resource_size(res), driver_name)) { 1717 DBG("someone's using UDC memory\n"); 1718 return -EBUSY; 1719 } 1720 1721 /* init software state */ 1722 udc = &controller; 1723 udc->gadget.dev.parent = dev; 1724 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) 1725 at91udc_of_init(udc, pdev->dev.of_node); 1726 else 1727 memcpy(&udc->board, dev_get_platdata(dev), 1728 sizeof(struct at91_udc_data)); 1729 udc->pdev = pdev; 1730 udc->enabled = 0; 1731 spin_lock_init(&udc->lock); 1732 1733 /* rm9200 needs manual D+ pullup; off by default */ 1734 if (cpu_is_at91rm9200()) { 1735 if (!gpio_is_valid(udc->board.pullup_pin)) { 1736 DBG("no D+ pullup?\n"); 1737 retval = -ENODEV; 1738 goto fail0; 1739 } 1740 retval = gpio_request(udc->board.pullup_pin, "udc_pullup"); 1741 if (retval) { 1742 DBG("D+ pullup is busy\n"); 1743 goto fail0; 1744 } 1745 gpio_direction_output(udc->board.pullup_pin, 1746 udc->board.pullup_active_low); 1747 } 1748 1749 /* newer chips have more FIFO memory than rm9200 */ 1750 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) { 1751 udc->ep[0].maxpacket = 64; 1752 udc->ep[3].maxpacket = 64; 1753 udc->ep[4].maxpacket = 512; 1754 udc->ep[5].maxpacket = 512; 1755 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) { 1756 udc->ep[3].maxpacket = 64; 1757 } else if (cpu_is_at91sam9263()) { 1758 udc->ep[0].maxpacket = 64; 1759 udc->ep[3].maxpacket = 64; 1760 } 1761 1762 udc->udp_baseaddr = ioremap(res->start, resource_size(res)); 1763 if (!udc->udp_baseaddr) { 1764 retval = -ENOMEM; 1765 goto fail0a; 1766 } 1767 1768 udc_reinit(udc); 1769 1770 /* get interface and function clocks */ 1771 udc->iclk = clk_get(dev, "udc_clk"); 1772 udc->fclk = clk_get(dev, "udpck"); 1773 if (IS_ENABLED(CONFIG_COMMON_CLK)) 1774 udc->uclk = clk_get(dev, "usb_clk"); 1775 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk) || 1776 (IS_ENABLED(CONFIG_COMMON_CLK) && IS_ERR(udc->uclk))) { 1777 DBG("clocks missing\n"); 1778 retval = -ENODEV; 1779 goto fail1; 1780 } 1781 1782 /* don't do anything until we have both gadget driver and VBUS */ 1783 retval = clk_prepare_enable(udc->iclk); 1784 if (retval) 1785 goto fail1; 1786 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 1787 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); 1788 /* Clear all pending interrupts - UDP may be used by bootloader. */ 1789 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); 1790 clk_disable_unprepare(udc->iclk); 1791 1792 /* request UDC and maybe VBUS irqs */ 1793 udc->udp_irq = platform_get_irq(pdev, 0); 1794 retval = request_irq(udc->udp_irq, at91_udc_irq, 1795 0, driver_name, udc); 1796 if (retval < 0) { 1797 DBG("request irq %d failed\n", udc->udp_irq); 1798 goto fail1; 1799 } 1800 if (gpio_is_valid(udc->board.vbus_pin)) { 1801 retval = gpio_request(udc->board.vbus_pin, "udc_vbus"); 1802 if (retval < 0) { 1803 DBG("request vbus pin failed\n"); 1804 goto fail2; 1805 } 1806 gpio_direction_input(udc->board.vbus_pin); 1807 1808 /* 1809 * Get the initial state of VBUS - we cannot expect 1810 * a pending interrupt. 1811 */ 1812 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^ 1813 udc->board.vbus_active_low; 1814 1815 if (udc->board.vbus_polled) { 1816 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work); 1817 setup_timer(&udc->vbus_timer, at91_vbus_timer, 1818 (unsigned long)udc); 1819 mod_timer(&udc->vbus_timer, 1820 jiffies + VBUS_POLL_TIMEOUT); 1821 } else { 1822 if (request_irq(gpio_to_irq(udc->board.vbus_pin), 1823 at91_vbus_irq, 0, driver_name, udc)) { 1824 DBG("request vbus irq %d failed\n", 1825 udc->board.vbus_pin); 1826 retval = -EBUSY; 1827 goto fail3; 1828 } 1829 } 1830 } else { 1831 DBG("no VBUS detection, assuming always-on\n"); 1832 udc->vbus = 1; 1833 } 1834 retval = usb_add_gadget_udc(dev, &udc->gadget); 1835 if (retval) 1836 goto fail4; 1837 dev_set_drvdata(dev, udc); 1838 device_init_wakeup(dev, 1); 1839 create_debug_file(udc); 1840 1841 INFO("%s version %s\n", driver_name, DRIVER_VERSION); 1842 return 0; 1843fail4: 1844 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled) 1845 free_irq(gpio_to_irq(udc->board.vbus_pin), udc); 1846fail3: 1847 if (gpio_is_valid(udc->board.vbus_pin)) 1848 gpio_free(udc->board.vbus_pin); 1849fail2: 1850 free_irq(udc->udp_irq, udc); 1851fail1: 1852 if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk)) 1853 clk_put(udc->uclk); 1854 if (!IS_ERR(udc->fclk)) 1855 clk_put(udc->fclk); 1856 if (!IS_ERR(udc->iclk)) 1857 clk_put(udc->iclk); 1858 iounmap(udc->udp_baseaddr); 1859fail0a: 1860 if (cpu_is_at91rm9200()) 1861 gpio_free(udc->board.pullup_pin); 1862fail0: 1863 release_mem_region(res->start, resource_size(res)); 1864 DBG("%s probe failed, %d\n", driver_name, retval); 1865 return retval; 1866} 1867 1868static int __exit at91udc_remove(struct platform_device *pdev) 1869{ 1870 struct at91_udc *udc = platform_get_drvdata(pdev); 1871 struct resource *res; 1872 unsigned long flags; 1873 1874 DBG("remove\n"); 1875 1876 usb_del_gadget_udc(&udc->gadget); 1877 if (udc->driver) 1878 return -EBUSY; 1879 1880 spin_lock_irqsave(&udc->lock, flags); 1881 pullup(udc, 0); 1882 spin_unlock_irqrestore(&udc->lock, flags); 1883 1884 device_init_wakeup(&pdev->dev, 0); 1885 remove_debug_file(udc); 1886 if (gpio_is_valid(udc->board.vbus_pin)) { 1887 free_irq(gpio_to_irq(udc->board.vbus_pin), udc); 1888 gpio_free(udc->board.vbus_pin); 1889 } 1890 free_irq(udc->udp_irq, udc); 1891 iounmap(udc->udp_baseaddr); 1892 1893 if (cpu_is_at91rm9200()) 1894 gpio_free(udc->board.pullup_pin); 1895 1896 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1897 release_mem_region(res->start, resource_size(res)); 1898 1899 clk_put(udc->iclk); 1900 clk_put(udc->fclk); 1901 if (IS_ENABLED(CONFIG_COMMON_CLK)) 1902 clk_put(udc->uclk); 1903 1904 return 0; 1905} 1906 1907#ifdef CONFIG_PM 1908static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) 1909{ 1910 struct at91_udc *udc = platform_get_drvdata(pdev); 1911 int wake = udc->driver && device_may_wakeup(&pdev->dev); 1912 unsigned long flags; 1913 1914 /* Unless we can act normally to the host (letting it wake us up 1915 * whenever it has work for us) force disconnect. Wakeup requires 1916 * PLLB for USB events (signaling for reset, wakeup, or incoming 1917 * tokens) and VBUS irqs (on systems which support them). 1918 */ 1919 if ((!udc->suspended && udc->addr) 1920 || !wake 1921 || at91_suspend_entering_slow_clock()) { 1922 spin_lock_irqsave(&udc->lock, flags); 1923 pullup(udc, 0); 1924 wake = 0; 1925 spin_unlock_irqrestore(&udc->lock, flags); 1926 } else 1927 enable_irq_wake(udc->udp_irq); 1928 1929 udc->active_suspend = wake; 1930 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake) 1931 enable_irq_wake(udc->board.vbus_pin); 1932 return 0; 1933} 1934 1935static int at91udc_resume(struct platform_device *pdev) 1936{ 1937 struct at91_udc *udc = platform_get_drvdata(pdev); 1938 unsigned long flags; 1939 1940 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && 1941 udc->active_suspend) 1942 disable_irq_wake(udc->board.vbus_pin); 1943 1944 /* maybe reconnect to host; if so, clocks on */ 1945 if (udc->active_suspend) 1946 disable_irq_wake(udc->udp_irq); 1947 else { 1948 spin_lock_irqsave(&udc->lock, flags); 1949 pullup(udc, 1); 1950 spin_unlock_irqrestore(&udc->lock, flags); 1951 } 1952 return 0; 1953} 1954#else 1955#define at91udc_suspend NULL 1956#define at91udc_resume NULL 1957#endif 1958 1959#if defined(CONFIG_OF) 1960static const struct of_device_id at91_udc_dt_ids[] = { 1961 { .compatible = "atmel,at91rm9200-udc" }, 1962 { /* sentinel */ } 1963}; 1964 1965MODULE_DEVICE_TABLE(of, at91_udc_dt_ids); 1966#endif 1967 1968static struct platform_driver at91_udc_driver = { 1969 .remove = __exit_p(at91udc_remove), 1970 .shutdown = at91udc_shutdown, 1971 .suspend = at91udc_suspend, 1972 .resume = at91udc_resume, 1973 .driver = { 1974 .name = (char *) driver_name, 1975 .owner = THIS_MODULE, 1976 .of_match_table = of_match_ptr(at91_udc_dt_ids), 1977 }, 1978}; 1979 1980module_platform_driver_probe(at91_udc_driver, at91udc_probe); 1981 1982MODULE_DESCRIPTION("AT91 udc driver"); 1983MODULE_AUTHOR("Thomas Rathbone, David Brownell"); 1984MODULE_LICENSE("GPL"); 1985MODULE_ALIAS("platform:at91_udc"); 1986