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 #include <linux/regmap.h> 35 #include <linux/mfd/syscon.h> 36 #include <linux/mfd/syscon/atmel-matrix.h> 37 38 #include "at91_udc.h" 39 40 41 /* 42 * This controller is simple and PIO-only. It's used in many AT91-series 43 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), 44 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. 45 * 46 * This driver expects the board has been wired with two GPIOs supporting 47 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the 48 * testing hasn't covered such cases.) 49 * 50 * The pullup is most important (so it's integrated on sam926x parts). It 51 * provides software control over whether the host enumerates the device. 52 * 53 * The VBUS sensing helps during enumeration, and allows both USB clocks 54 * (and the transceiver) to stay gated off until they're necessary, saving 55 * power. During USB suspend, the 48 MHz clock is gated off in hardware; 56 * it may also be gated off by software during some Linux sleep states. 57 */ 58 59 #define DRIVER_VERSION "3 May 2006" 60 61 static const char driver_name [] = "at91_udc"; 62 63 static const struct { 64 const char *name; 65 const struct usb_ep_caps caps; 66 } ep_info[] = { 67 #define EP_INFO(_name, _caps) \ 68 { \ 69 .name = _name, \ 70 .caps = _caps, \ 71 } 72 73 EP_INFO("ep0", 74 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 75 EP_INFO("ep1", 76 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 77 EP_INFO("ep2", 78 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 79 EP_INFO("ep3-int", 80 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)), 81 EP_INFO("ep4", 82 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 83 EP_INFO("ep5", 84 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 85 86 #undef EP_INFO 87 }; 88 89 #define ep0name ep_info[0].name 90 91 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000) 92 93 #define at91_udp_read(udc, reg) \ 94 __raw_readl((udc)->udp_baseaddr + (reg)) 95 #define at91_udp_write(udc, reg, val) \ 96 __raw_writel((val), (udc)->udp_baseaddr + (reg)) 97 98 /*-------------------------------------------------------------------------*/ 99 100 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 101 102 #include <linux/seq_file.h> 103 104 static const char debug_filename[] = "driver/udc"; 105 106 #define FOURBITS "%s%s%s%s" 107 #define EIGHTBITS FOURBITS FOURBITS 108 109 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) 110 { 111 static char *types[] = { 112 "control", "out-iso", "out-bulk", "out-int", 113 "BOGUS", "in-iso", "in-bulk", "in-int"}; 114 115 u32 csr; 116 struct at91_request *req; 117 unsigned long flags; 118 struct at91_udc *udc = ep->udc; 119 120 spin_lock_irqsave(&udc->lock, flags); 121 122 csr = __raw_readl(ep->creg); 123 124 /* NOTE: not collecting per-endpoint irq statistics... */ 125 126 seq_printf(s, "\n"); 127 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", 128 ep->ep.name, ep->ep.maxpacket, 129 ep->is_in ? "in" : "out", 130 ep->is_iso ? " iso" : "", 131 ep->is_pingpong 132 ? (ep->fifo_bank ? "pong" : "ping") 133 : "", 134 ep->stopped ? " stopped" : ""); 135 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", 136 csr, 137 (csr & 0x07ff0000) >> 16, 138 (csr & (1 << 15)) ? "enabled" : "disabled", 139 (csr & (1 << 11)) ? "DATA1" : "DATA0", 140 types[(csr & 0x700) >> 8], 141 142 /* iff type is control then print current direction */ 143 (!(csr & 0x700)) 144 ? ((csr & (1 << 7)) ? " IN" : " OUT") 145 : "", 146 (csr & (1 << 6)) ? " rxdatabk1" : "", 147 (csr & (1 << 5)) ? " forcestall" : "", 148 (csr & (1 << 4)) ? " txpktrdy" : "", 149 150 (csr & (1 << 3)) ? " stallsent" : "", 151 (csr & (1 << 2)) ? " rxsetup" : "", 152 (csr & (1 << 1)) ? " rxdatabk0" : "", 153 (csr & (1 << 0)) ? " txcomp" : ""); 154 if (list_empty (&ep->queue)) 155 seq_printf(s, "\t(queue empty)\n"); 156 157 else list_for_each_entry (req, &ep->queue, queue) { 158 unsigned length = req->req.actual; 159 160 seq_printf(s, "\treq %p len %d/%d buf %p\n", 161 &req->req, length, 162 req->req.length, req->req.buf); 163 } 164 spin_unlock_irqrestore(&udc->lock, flags); 165 } 166 167 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) 168 { 169 int i; 170 171 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, 172 (mask & (1 << 13)) ? " wakeup" : "", 173 (mask & (1 << 12)) ? " endbusres" : "", 174 175 (mask & (1 << 11)) ? " sofint" : "", 176 (mask & (1 << 10)) ? " extrsm" : "", 177 (mask & (1 << 9)) ? " rxrsm" : "", 178 (mask & (1 << 8)) ? " rxsusp" : ""); 179 for (i = 0; i < 8; i++) { 180 if (mask & (1 << i)) 181 seq_printf(s, " ep%d", i); 182 } 183 seq_printf(s, "\n"); 184 } 185 186 static int proc_udc_show(struct seq_file *s, void *unused) 187 { 188 struct at91_udc *udc = s->private; 189 struct at91_ep *ep; 190 u32 tmp; 191 192 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); 193 194 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", 195 udc->vbus ? "present" : "off", 196 udc->enabled 197 ? (udc->vbus ? "active" : "enabled") 198 : "disabled", 199 udc->gadget.is_selfpowered ? "self" : "VBUS", 200 udc->suspended ? ", suspended" : "", 201 udc->driver ? udc->driver->driver.name : "(none)"); 202 203 /* don't access registers when interface isn't clocked */ 204 if (!udc->clocked) { 205 seq_printf(s, "(not clocked)\n"); 206 return 0; 207 } 208 209 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM); 210 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, 211 (tmp & AT91_UDP_FRM_OK) ? " ok" : "", 212 (tmp & AT91_UDP_FRM_ERR) ? " err" : "", 213 (tmp & AT91_UDP_NUM)); 214 215 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 216 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, 217 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", 218 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", 219 (tmp & AT91_UDP_ESR) ? " esr" : "", 220 (tmp & AT91_UDP_CONFG) ? " confg" : "", 221 (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); 222 223 tmp = at91_udp_read(udc, AT91_UDP_FADDR); 224 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, 225 (tmp & AT91_UDP_FEN) ? " fen" : "", 226 (tmp & AT91_UDP_FADD)); 227 228 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR)); 229 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR)); 230 231 if (udc->enabled && udc->vbus) { 232 proc_ep_show(s, &udc->ep[0]); 233 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { 234 if (ep->ep.desc) 235 proc_ep_show(s, ep); 236 } 237 } 238 return 0; 239 } 240 241 static int proc_udc_open(struct inode *inode, struct file *file) 242 { 243 return single_open(file, proc_udc_show, PDE_DATA(inode)); 244 } 245 246 static const struct file_operations proc_ops = { 247 .owner = THIS_MODULE, 248 .open = proc_udc_open, 249 .read = seq_read, 250 .llseek = seq_lseek, 251 .release = single_release, 252 }; 253 254 static void create_debug_file(struct at91_udc *udc) 255 { 256 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc); 257 } 258 259 static void remove_debug_file(struct at91_udc *udc) 260 { 261 if (udc->pde) 262 remove_proc_entry(debug_filename, NULL); 263 } 264 265 #else 266 267 static inline void create_debug_file(struct at91_udc *udc) {} 268 static inline void remove_debug_file(struct at91_udc *udc) {} 269 270 #endif 271 272 273 /*-------------------------------------------------------------------------*/ 274 275 static void done(struct at91_ep *ep, struct at91_request *req, int status) 276 { 277 unsigned stopped = ep->stopped; 278 struct at91_udc *udc = ep->udc; 279 280 list_del_init(&req->queue); 281 if (req->req.status == -EINPROGRESS) 282 req->req.status = status; 283 else 284 status = req->req.status; 285 if (status && status != -ESHUTDOWN) 286 VDBG("%s done %p, status %d\n", ep->ep.name, req, status); 287 288 ep->stopped = 1; 289 spin_unlock(&udc->lock); 290 usb_gadget_giveback_request(&ep->ep, &req->req); 291 spin_lock(&udc->lock); 292 ep->stopped = stopped; 293 294 /* ep0 is always ready; other endpoints need a non-empty queue */ 295 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) 296 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask); 297 } 298 299 /*-------------------------------------------------------------------------*/ 300 301 /* bits indicating OUT fifo has data ready */ 302 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) 303 304 /* 305 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write 306 * back most of the value you just read (because of side effects, including 307 * bits that may change after reading and before writing). 308 * 309 * Except when changing a specific bit, always write values which: 310 * - clear SET_FX bits (setting them could change something) 311 * - set CLR_FX bits (clearing them could change something) 312 * 313 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE 314 * that shouldn't normally be changed. 315 * 316 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, 317 * implying a need to wait for one write to complete (test relevant bits) 318 * before starting the next write. This shouldn't be an issue given how 319 * infrequently we write, except maybe for write-then-read idioms. 320 */ 321 #define SET_FX (AT91_UDP_TXPKTRDY) 322 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ 323 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) 324 325 /* pull OUT packet data from the endpoint's fifo */ 326 static int read_fifo (struct at91_ep *ep, struct at91_request *req) 327 { 328 u32 __iomem *creg = ep->creg; 329 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 330 u32 csr; 331 u8 *buf; 332 unsigned int count, bufferspace, is_done; 333 334 buf = req->req.buf + req->req.actual; 335 bufferspace = req->req.length - req->req.actual; 336 337 /* 338 * there might be nothing to read if ep_queue() calls us, 339 * or if we already emptied both pingpong buffers 340 */ 341 rescan: 342 csr = __raw_readl(creg); 343 if ((csr & RX_DATA_READY) == 0) 344 return 0; 345 346 count = (csr & AT91_UDP_RXBYTECNT) >> 16; 347 if (count > ep->ep.maxpacket) 348 count = ep->ep.maxpacket; 349 if (count > bufferspace) { 350 DBG("%s buffer overflow\n", ep->ep.name); 351 req->req.status = -EOVERFLOW; 352 count = bufferspace; 353 } 354 __raw_readsb(dreg, buf, count); 355 356 /* release and swap pingpong mem bank */ 357 csr |= CLR_FX; 358 if (ep->is_pingpong) { 359 if (ep->fifo_bank == 0) { 360 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 361 ep->fifo_bank = 1; 362 } else { 363 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); 364 ep->fifo_bank = 0; 365 } 366 } else 367 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 368 __raw_writel(csr, creg); 369 370 req->req.actual += count; 371 is_done = (count < ep->ep.maxpacket); 372 if (count == bufferspace) 373 is_done = 1; 374 375 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, 376 is_done ? " (done)" : ""); 377 378 /* 379 * avoid extra trips through IRQ logic for packets already in 380 * the fifo ... maybe preventing an extra (expensive) OUT-NAK 381 */ 382 if (is_done) 383 done(ep, req, 0); 384 else if (ep->is_pingpong) { 385 /* 386 * One dummy read to delay the code because of a HW glitch: 387 * CSR returns bad RXCOUNT when read too soon after updating 388 * RX_DATA_BK flags. 389 */ 390 csr = __raw_readl(creg); 391 392 bufferspace -= count; 393 buf += count; 394 goto rescan; 395 } 396 397 return is_done; 398 } 399 400 /* load fifo for an IN packet */ 401 static int write_fifo(struct at91_ep *ep, struct at91_request *req) 402 { 403 u32 __iomem *creg = ep->creg; 404 u32 csr = __raw_readl(creg); 405 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 406 unsigned total, count, is_last; 407 u8 *buf; 408 409 /* 410 * TODO: allow for writing two packets to the fifo ... that'll 411 * reduce the amount of IN-NAKing, but probably won't affect 412 * throughput much. (Unlike preventing OUT-NAKing!) 413 */ 414 415 /* 416 * If ep_queue() calls us, the queue is empty and possibly in 417 * odd states like TXCOMP not yet cleared (we do it, saving at 418 * least one IRQ) or the fifo not yet being free. Those aren't 419 * issues normally (IRQ handler fast path). 420 */ 421 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { 422 if (csr & AT91_UDP_TXCOMP) { 423 csr |= CLR_FX; 424 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 425 __raw_writel(csr, creg); 426 csr = __raw_readl(creg); 427 } 428 if (csr & AT91_UDP_TXPKTRDY) 429 return 0; 430 } 431 432 buf = req->req.buf + req->req.actual; 433 prefetch(buf); 434 total = req->req.length - req->req.actual; 435 if (ep->ep.maxpacket < total) { 436 count = ep->ep.maxpacket; 437 is_last = 0; 438 } else { 439 count = total; 440 is_last = (count < ep->ep.maxpacket) || !req->req.zero; 441 } 442 443 /* 444 * Write the packet, maybe it's a ZLP. 445 * 446 * NOTE: incrementing req->actual before we receive the ACK means 447 * gadget driver IN bytecounts can be wrong in fault cases. That's 448 * fixable with PIO drivers like this one (save "count" here, and 449 * do the increment later on TX irq), but not for most DMA hardware. 450 * 451 * So all gadget drivers must accept that potential error. Some 452 * hardware supports precise fifo status reporting, letting them 453 * recover when the actual bytecount matters (e.g. for USB Test 454 * and Measurement Class devices). 455 */ 456 __raw_writesb(dreg, buf, count); 457 csr &= ~SET_FX; 458 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 459 __raw_writel(csr, creg); 460 req->req.actual += count; 461 462 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, 463 is_last ? " (done)" : ""); 464 if (is_last) 465 done(ep, req, 0); 466 return is_last; 467 } 468 469 static void nuke(struct at91_ep *ep, int status) 470 { 471 struct at91_request *req; 472 473 /* terminate any request in the queue */ 474 ep->stopped = 1; 475 if (list_empty(&ep->queue)) 476 return; 477 478 VDBG("%s %s\n", __func__, ep->ep.name); 479 while (!list_empty(&ep->queue)) { 480 req = list_entry(ep->queue.next, struct at91_request, queue); 481 done(ep, req, status); 482 } 483 } 484 485 /*-------------------------------------------------------------------------*/ 486 487 static int at91_ep_enable(struct usb_ep *_ep, 488 const struct usb_endpoint_descriptor *desc) 489 { 490 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 491 struct at91_udc *udc; 492 u16 maxpacket; 493 u32 tmp; 494 unsigned long flags; 495 496 if (!_ep || !ep 497 || !desc || _ep->name == ep0name 498 || desc->bDescriptorType != USB_DT_ENDPOINT 499 || (maxpacket = usb_endpoint_maxp(desc)) == 0 500 || maxpacket > ep->maxpacket) { 501 DBG("bad ep or descriptor\n"); 502 return -EINVAL; 503 } 504 505 udc = ep->udc; 506 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 507 DBG("bogus device state\n"); 508 return -ESHUTDOWN; 509 } 510 511 tmp = usb_endpoint_type(desc); 512 switch (tmp) { 513 case USB_ENDPOINT_XFER_CONTROL: 514 DBG("only one control endpoint\n"); 515 return -EINVAL; 516 case USB_ENDPOINT_XFER_INT: 517 if (maxpacket > 64) 518 goto bogus_max; 519 break; 520 case USB_ENDPOINT_XFER_BULK: 521 switch (maxpacket) { 522 case 8: 523 case 16: 524 case 32: 525 case 64: 526 goto ok; 527 } 528 bogus_max: 529 DBG("bogus maxpacket %d\n", maxpacket); 530 return -EINVAL; 531 case USB_ENDPOINT_XFER_ISOC: 532 if (!ep->is_pingpong) { 533 DBG("iso requires double buffering\n"); 534 return -EINVAL; 535 } 536 break; 537 } 538 539 ok: 540 spin_lock_irqsave(&udc->lock, flags); 541 542 /* initialize endpoint to match this descriptor */ 543 ep->is_in = usb_endpoint_dir_in(desc); 544 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); 545 ep->stopped = 0; 546 if (ep->is_in) 547 tmp |= 0x04; 548 tmp <<= 8; 549 tmp |= AT91_UDP_EPEDS; 550 __raw_writel(tmp, ep->creg); 551 552 ep->ep.maxpacket = maxpacket; 553 554 /* 555 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, 556 * since endpoint resets don't reset hw pingpong state. 557 */ 558 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 559 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 560 561 spin_unlock_irqrestore(&udc->lock, flags); 562 return 0; 563 } 564 565 static int at91_ep_disable (struct usb_ep * _ep) 566 { 567 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 568 struct at91_udc *udc = ep->udc; 569 unsigned long flags; 570 571 if (ep == &ep->udc->ep[0]) 572 return -EINVAL; 573 574 spin_lock_irqsave(&udc->lock, flags); 575 576 nuke(ep, -ESHUTDOWN); 577 578 /* restore the endpoint's pristine config */ 579 ep->ep.desc = NULL; 580 ep->ep.maxpacket = ep->maxpacket; 581 582 /* reset fifos and endpoint */ 583 if (ep->udc->clocked) { 584 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 585 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 586 __raw_writel(0, ep->creg); 587 } 588 589 spin_unlock_irqrestore(&udc->lock, flags); 590 return 0; 591 } 592 593 /* 594 * this is a PIO-only driver, so there's nothing 595 * interesting for request or buffer allocation. 596 */ 597 598 static struct usb_request * 599 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 600 { 601 struct at91_request *req; 602 603 req = kzalloc(sizeof (struct at91_request), gfp_flags); 604 if (!req) 605 return NULL; 606 607 INIT_LIST_HEAD(&req->queue); 608 return &req->req; 609 } 610 611 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) 612 { 613 struct at91_request *req; 614 615 req = container_of(_req, struct at91_request, req); 616 BUG_ON(!list_empty(&req->queue)); 617 kfree(req); 618 } 619 620 static int at91_ep_queue(struct usb_ep *_ep, 621 struct usb_request *_req, gfp_t gfp_flags) 622 { 623 struct at91_request *req; 624 struct at91_ep *ep; 625 struct at91_udc *udc; 626 int status; 627 unsigned long flags; 628 629 req = container_of(_req, struct at91_request, req); 630 ep = container_of(_ep, struct at91_ep, ep); 631 632 if (!_req || !_req->complete 633 || !_req->buf || !list_empty(&req->queue)) { 634 DBG("invalid request\n"); 635 return -EINVAL; 636 } 637 638 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) { 639 DBG("invalid ep\n"); 640 return -EINVAL; 641 } 642 643 udc = ep->udc; 644 645 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 646 DBG("invalid device\n"); 647 return -EINVAL; 648 } 649 650 _req->status = -EINPROGRESS; 651 _req->actual = 0; 652 653 spin_lock_irqsave(&udc->lock, flags); 654 655 /* try to kickstart any empty and idle queue */ 656 if (list_empty(&ep->queue) && !ep->stopped) { 657 int is_ep0; 658 659 /* 660 * If this control request has a non-empty DATA stage, this 661 * will start that stage. It works just like a non-control 662 * request (until the status stage starts, maybe early). 663 * 664 * If the data stage is empty, then this starts a successful 665 * IN/STATUS stage. (Unsuccessful ones use set_halt.) 666 */ 667 is_ep0 = (ep->ep.name == ep0name); 668 if (is_ep0) { 669 u32 tmp; 670 671 if (!udc->req_pending) { 672 status = -EINVAL; 673 goto done; 674 } 675 676 /* 677 * defer changing CONFG until after the gadget driver 678 * reconfigures the endpoints. 679 */ 680 if (udc->wait_for_config_ack) { 681 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 682 tmp ^= AT91_UDP_CONFG; 683 VDBG("toggle config\n"); 684 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 685 } 686 if (req->req.length == 0) { 687 ep0_in_status: 688 PACKET("ep0 in/status\n"); 689 status = 0; 690 tmp = __raw_readl(ep->creg); 691 tmp &= ~SET_FX; 692 tmp |= CLR_FX | AT91_UDP_TXPKTRDY; 693 __raw_writel(tmp, ep->creg); 694 udc->req_pending = 0; 695 goto done; 696 } 697 } 698 699 if (ep->is_in) 700 status = write_fifo(ep, req); 701 else { 702 status = read_fifo(ep, req); 703 704 /* IN/STATUS stage is otherwise triggered by irq */ 705 if (status && is_ep0) 706 goto ep0_in_status; 707 } 708 } else 709 status = 0; 710 711 if (req && !status) { 712 list_add_tail (&req->queue, &ep->queue); 713 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask); 714 } 715 done: 716 spin_unlock_irqrestore(&udc->lock, flags); 717 return (status < 0) ? status : 0; 718 } 719 720 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 721 { 722 struct at91_ep *ep; 723 struct at91_request *req; 724 unsigned long flags; 725 struct at91_udc *udc; 726 727 ep = container_of(_ep, struct at91_ep, ep); 728 if (!_ep || ep->ep.name == ep0name) 729 return -EINVAL; 730 731 udc = ep->udc; 732 733 spin_lock_irqsave(&udc->lock, flags); 734 735 /* make sure it's actually queued on this endpoint */ 736 list_for_each_entry (req, &ep->queue, queue) { 737 if (&req->req == _req) 738 break; 739 } 740 if (&req->req != _req) { 741 spin_unlock_irqrestore(&udc->lock, flags); 742 return -EINVAL; 743 } 744 745 done(ep, req, -ECONNRESET); 746 spin_unlock_irqrestore(&udc->lock, flags); 747 return 0; 748 } 749 750 static int at91_ep_set_halt(struct usb_ep *_ep, int value) 751 { 752 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); 753 struct at91_udc *udc = ep->udc; 754 u32 __iomem *creg; 755 u32 csr; 756 unsigned long flags; 757 int status = 0; 758 759 if (!_ep || ep->is_iso || !ep->udc->clocked) 760 return -EINVAL; 761 762 creg = ep->creg; 763 spin_lock_irqsave(&udc->lock, flags); 764 765 csr = __raw_readl(creg); 766 767 /* 768 * fail with still-busy IN endpoints, ensuring correct sequencing 769 * of data tx then stall. note that the fifo rx bytecount isn't 770 * completely accurate as a tx bytecount. 771 */ 772 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) 773 status = -EAGAIN; 774 else { 775 csr |= CLR_FX; 776 csr &= ~SET_FX; 777 if (value) { 778 csr |= AT91_UDP_FORCESTALL; 779 VDBG("halt %s\n", ep->ep.name); 780 } else { 781 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 782 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 783 csr &= ~AT91_UDP_FORCESTALL; 784 } 785 __raw_writel(csr, creg); 786 } 787 788 spin_unlock_irqrestore(&udc->lock, flags); 789 return status; 790 } 791 792 static const struct usb_ep_ops at91_ep_ops = { 793 .enable = at91_ep_enable, 794 .disable = at91_ep_disable, 795 .alloc_request = at91_ep_alloc_request, 796 .free_request = at91_ep_free_request, 797 .queue = at91_ep_queue, 798 .dequeue = at91_ep_dequeue, 799 .set_halt = at91_ep_set_halt, 800 /* there's only imprecise fifo status reporting */ 801 }; 802 803 /*-------------------------------------------------------------------------*/ 804 805 static int at91_get_frame(struct usb_gadget *gadget) 806 { 807 struct at91_udc *udc = to_udc(gadget); 808 809 if (!to_udc(gadget)->clocked) 810 return -EINVAL; 811 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; 812 } 813 814 static int at91_wakeup(struct usb_gadget *gadget) 815 { 816 struct at91_udc *udc = to_udc(gadget); 817 u32 glbstate; 818 int status = -EINVAL; 819 unsigned long flags; 820 821 DBG("%s\n", __func__ ); 822 spin_lock_irqsave(&udc->lock, flags); 823 824 if (!udc->clocked || !udc->suspended) 825 goto done; 826 827 /* NOTE: some "early versions" handle ESR differently ... */ 828 829 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); 830 if (!(glbstate & AT91_UDP_ESR)) 831 goto done; 832 glbstate |= AT91_UDP_ESR; 833 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); 834 835 done: 836 spin_unlock_irqrestore(&udc->lock, flags); 837 return status; 838 } 839 840 /* reinit == restore initial software state */ 841 static void udc_reinit(struct at91_udc *udc) 842 { 843 u32 i; 844 845 INIT_LIST_HEAD(&udc->gadget.ep_list); 846 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); 847 udc->gadget.quirk_stall_not_supp = 1; 848 849 for (i = 0; i < NUM_ENDPOINTS; i++) { 850 struct at91_ep *ep = &udc->ep[i]; 851 852 if (i != 0) 853 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 854 ep->ep.desc = NULL; 855 ep->stopped = 0; 856 ep->fifo_bank = 0; 857 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 858 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); 859 /* initialize one queue per endpoint */ 860 INIT_LIST_HEAD(&ep->queue); 861 } 862 } 863 864 static void reset_gadget(struct at91_udc *udc) 865 { 866 struct usb_gadget_driver *driver = udc->driver; 867 int i; 868 869 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 870 driver = NULL; 871 udc->gadget.speed = USB_SPEED_UNKNOWN; 872 udc->suspended = 0; 873 874 for (i = 0; i < NUM_ENDPOINTS; i++) { 875 struct at91_ep *ep = &udc->ep[i]; 876 877 ep->stopped = 1; 878 nuke(ep, -ESHUTDOWN); 879 } 880 if (driver) { 881 spin_unlock(&udc->lock); 882 usb_gadget_udc_reset(&udc->gadget, driver); 883 spin_lock(&udc->lock); 884 } 885 886 udc_reinit(udc); 887 } 888 889 static void stop_activity(struct at91_udc *udc) 890 { 891 struct usb_gadget_driver *driver = udc->driver; 892 int i; 893 894 if (udc->gadget.speed == USB_SPEED_UNKNOWN) 895 driver = NULL; 896 udc->gadget.speed = USB_SPEED_UNKNOWN; 897 udc->suspended = 0; 898 899 for (i = 0; i < NUM_ENDPOINTS; i++) { 900 struct at91_ep *ep = &udc->ep[i]; 901 ep->stopped = 1; 902 nuke(ep, -ESHUTDOWN); 903 } 904 if (driver) { 905 spin_unlock(&udc->lock); 906 driver->disconnect(&udc->gadget); 907 spin_lock(&udc->lock); 908 } 909 910 udc_reinit(udc); 911 } 912 913 static void clk_on(struct at91_udc *udc) 914 { 915 if (udc->clocked) 916 return; 917 udc->clocked = 1; 918 919 clk_enable(udc->iclk); 920 clk_enable(udc->fclk); 921 } 922 923 static void clk_off(struct at91_udc *udc) 924 { 925 if (!udc->clocked) 926 return; 927 udc->clocked = 0; 928 udc->gadget.speed = USB_SPEED_UNKNOWN; 929 clk_disable(udc->fclk); 930 clk_disable(udc->iclk); 931 } 932 933 /* 934 * activate/deactivate link with host; minimize power usage for 935 * inactive links by cutting clocks and transceiver power. 936 */ 937 static void pullup(struct at91_udc *udc, int is_on) 938 { 939 if (!udc->enabled || !udc->vbus) 940 is_on = 0; 941 DBG("%sactive\n", is_on ? "" : "in"); 942 943 if (is_on) { 944 clk_on(udc); 945 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 946 at91_udp_write(udc, AT91_UDP_TXVC, 0); 947 } else { 948 stop_activity(udc); 949 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 950 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 951 clk_off(udc); 952 } 953 954 if (udc->caps && udc->caps->pullup) 955 udc->caps->pullup(udc, is_on); 956 } 957 958 /* vbus is here! turn everything on that's ready */ 959 static int at91_vbus_session(struct usb_gadget *gadget, int is_active) 960 { 961 struct at91_udc *udc = to_udc(gadget); 962 unsigned long flags; 963 964 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ 965 spin_lock_irqsave(&udc->lock, flags); 966 udc->vbus = (is_active != 0); 967 if (udc->driver) 968 pullup(udc, is_active); 969 else 970 pullup(udc, 0); 971 spin_unlock_irqrestore(&udc->lock, flags); 972 return 0; 973 } 974 975 static int at91_pullup(struct usb_gadget *gadget, int is_on) 976 { 977 struct at91_udc *udc = to_udc(gadget); 978 unsigned long flags; 979 980 spin_lock_irqsave(&udc->lock, flags); 981 udc->enabled = is_on = !!is_on; 982 pullup(udc, is_on); 983 spin_unlock_irqrestore(&udc->lock, flags); 984 return 0; 985 } 986 987 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) 988 { 989 struct at91_udc *udc = to_udc(gadget); 990 unsigned long flags; 991 992 spin_lock_irqsave(&udc->lock, flags); 993 gadget->is_selfpowered = (is_on != 0); 994 spin_unlock_irqrestore(&udc->lock, flags); 995 return 0; 996 } 997 998 static int at91_start(struct usb_gadget *gadget, 999 struct usb_gadget_driver *driver); 1000 static int at91_stop(struct usb_gadget *gadget); 1001 1002 static const struct usb_gadget_ops at91_udc_ops = { 1003 .get_frame = at91_get_frame, 1004 .wakeup = at91_wakeup, 1005 .set_selfpowered = at91_set_selfpowered, 1006 .vbus_session = at91_vbus_session, 1007 .pullup = at91_pullup, 1008 .udc_start = at91_start, 1009 .udc_stop = at91_stop, 1010 1011 /* 1012 * VBUS-powered devices may also also want to support bigger 1013 * power budgets after an appropriate SET_CONFIGURATION. 1014 */ 1015 /* .vbus_power = at91_vbus_power, */ 1016 }; 1017 1018 /*-------------------------------------------------------------------------*/ 1019 1020 static int handle_ep(struct at91_ep *ep) 1021 { 1022 struct at91_request *req; 1023 u32 __iomem *creg = ep->creg; 1024 u32 csr = __raw_readl(creg); 1025 1026 if (!list_empty(&ep->queue)) 1027 req = list_entry(ep->queue.next, 1028 struct at91_request, queue); 1029 else 1030 req = NULL; 1031 1032 if (ep->is_in) { 1033 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { 1034 csr |= CLR_FX; 1035 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); 1036 __raw_writel(csr, creg); 1037 } 1038 if (req) 1039 return write_fifo(ep, req); 1040 1041 } else { 1042 if (csr & AT91_UDP_STALLSENT) { 1043 /* STALLSENT bit == ISOERR */ 1044 if (ep->is_iso && req) 1045 req->req.status = -EILSEQ; 1046 csr |= CLR_FX; 1047 csr &= ~(SET_FX | AT91_UDP_STALLSENT); 1048 __raw_writel(csr, creg); 1049 csr = __raw_readl(creg); 1050 } 1051 if (req && (csr & RX_DATA_READY)) 1052 return read_fifo(ep, req); 1053 } 1054 return 0; 1055 } 1056 1057 union setup { 1058 u8 raw[8]; 1059 struct usb_ctrlrequest r; 1060 }; 1061 1062 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) 1063 { 1064 u32 __iomem *creg = ep->creg; 1065 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); 1066 unsigned rxcount, i = 0; 1067 u32 tmp; 1068 union setup pkt; 1069 int status = 0; 1070 1071 /* read and ack SETUP; hard-fail for bogus packets */ 1072 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; 1073 if (likely(rxcount == 8)) { 1074 while (rxcount--) 1075 pkt.raw[i++] = __raw_readb(dreg); 1076 if (pkt.r.bRequestType & USB_DIR_IN) { 1077 csr |= AT91_UDP_DIR; 1078 ep->is_in = 1; 1079 } else { 1080 csr &= ~AT91_UDP_DIR; 1081 ep->is_in = 0; 1082 } 1083 } else { 1084 /* REVISIT this happens sometimes under load; why?? */ 1085 ERR("SETUP len %d, csr %08x\n", rxcount, csr); 1086 status = -EINVAL; 1087 } 1088 csr |= CLR_FX; 1089 csr &= ~(SET_FX | AT91_UDP_RXSETUP); 1090 __raw_writel(csr, creg); 1091 udc->wait_for_addr_ack = 0; 1092 udc->wait_for_config_ack = 0; 1093 ep->stopped = 0; 1094 if (unlikely(status != 0)) 1095 goto stall; 1096 1097 #define w_index le16_to_cpu(pkt.r.wIndex) 1098 #define w_value le16_to_cpu(pkt.r.wValue) 1099 #define w_length le16_to_cpu(pkt.r.wLength) 1100 1101 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 1102 pkt.r.bRequestType, pkt.r.bRequest, 1103 w_value, w_index, w_length); 1104 1105 /* 1106 * A few standard requests get handled here, ones that touch 1107 * hardware ... notably for device and endpoint features. 1108 */ 1109 udc->req_pending = 1; 1110 csr = __raw_readl(creg); 1111 csr |= CLR_FX; 1112 csr &= ~SET_FX; 1113 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { 1114 1115 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1116 | USB_REQ_SET_ADDRESS: 1117 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); 1118 udc->addr = w_value; 1119 udc->wait_for_addr_ack = 1; 1120 udc->req_pending = 0; 1121 /* FADDR is set later, when we ack host STATUS */ 1122 return; 1123 1124 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1125 | USB_REQ_SET_CONFIGURATION: 1126 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; 1127 if (pkt.r.wValue) 1128 udc->wait_for_config_ack = (tmp == 0); 1129 else 1130 udc->wait_for_config_ack = (tmp != 0); 1131 if (udc->wait_for_config_ack) 1132 VDBG("wait for config\n"); 1133 /* CONFG is toggled later, if gadget driver succeeds */ 1134 break; 1135 1136 /* 1137 * Hosts may set or clear remote wakeup status, and 1138 * devices may report they're VBUS powered. 1139 */ 1140 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1141 | USB_REQ_GET_STATUS: 1142 tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED); 1143 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) 1144 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); 1145 PACKET("get device status\n"); 1146 __raw_writeb(tmp, dreg); 1147 __raw_writeb(0, dreg); 1148 goto write_in; 1149 /* then STATUS starts later, automatically */ 1150 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1151 | USB_REQ_SET_FEATURE: 1152 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1153 goto stall; 1154 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1155 tmp |= AT91_UDP_ESR; 1156 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1157 goto succeed; 1158 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) 1159 | USB_REQ_CLEAR_FEATURE: 1160 if (w_value != USB_DEVICE_REMOTE_WAKEUP) 1161 goto stall; 1162 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1163 tmp &= ~AT91_UDP_ESR; 1164 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1165 goto succeed; 1166 1167 /* 1168 * Interfaces have no feature settings; this is pretty useless. 1169 * we won't even insist the interface exists... 1170 */ 1171 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1172 | USB_REQ_GET_STATUS: 1173 PACKET("get interface status\n"); 1174 __raw_writeb(0, dreg); 1175 __raw_writeb(0, dreg); 1176 goto write_in; 1177 /* then STATUS starts later, automatically */ 1178 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1179 | USB_REQ_SET_FEATURE: 1180 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) 1181 | USB_REQ_CLEAR_FEATURE: 1182 goto stall; 1183 1184 /* 1185 * Hosts may clear bulk/intr endpoint halt after the gadget 1186 * driver sets it (not widely used); or set it (for testing) 1187 */ 1188 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1189 | USB_REQ_GET_STATUS: 1190 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1191 ep = &udc->ep[tmp]; 1192 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc)) 1193 goto stall; 1194 1195 if (tmp) { 1196 if ((w_index & USB_DIR_IN)) { 1197 if (!ep->is_in) 1198 goto stall; 1199 } else if (ep->is_in) 1200 goto stall; 1201 } 1202 PACKET("get %s status\n", ep->ep.name); 1203 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) 1204 tmp = (1 << USB_ENDPOINT_HALT); 1205 else 1206 tmp = 0; 1207 __raw_writeb(tmp, dreg); 1208 __raw_writeb(0, dreg); 1209 goto write_in; 1210 /* then STATUS starts later, automatically */ 1211 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1212 | USB_REQ_SET_FEATURE: 1213 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1214 ep = &udc->ep[tmp]; 1215 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1216 goto stall; 1217 if (!ep->ep.desc || ep->is_iso) 1218 goto stall; 1219 if ((w_index & USB_DIR_IN)) { 1220 if (!ep->is_in) 1221 goto stall; 1222 } else if (ep->is_in) 1223 goto stall; 1224 1225 tmp = __raw_readl(ep->creg); 1226 tmp &= ~SET_FX; 1227 tmp |= CLR_FX | AT91_UDP_FORCESTALL; 1228 __raw_writel(tmp, ep->creg); 1229 goto succeed; 1230 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) 1231 | USB_REQ_CLEAR_FEATURE: 1232 tmp = w_index & USB_ENDPOINT_NUMBER_MASK; 1233 ep = &udc->ep[tmp]; 1234 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) 1235 goto stall; 1236 if (tmp == 0) 1237 goto succeed; 1238 if (!ep->ep.desc || ep->is_iso) 1239 goto stall; 1240 if ((w_index & USB_DIR_IN)) { 1241 if (!ep->is_in) 1242 goto stall; 1243 } else if (ep->is_in) 1244 goto stall; 1245 1246 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); 1247 at91_udp_write(udc, AT91_UDP_RST_EP, 0); 1248 tmp = __raw_readl(ep->creg); 1249 tmp |= CLR_FX; 1250 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); 1251 __raw_writel(tmp, ep->creg); 1252 if (!list_empty(&ep->queue)) 1253 handle_ep(ep); 1254 goto succeed; 1255 } 1256 1257 #undef w_value 1258 #undef w_index 1259 #undef w_length 1260 1261 /* pass request up to the gadget driver */ 1262 if (udc->driver) { 1263 spin_unlock(&udc->lock); 1264 status = udc->driver->setup(&udc->gadget, &pkt.r); 1265 spin_lock(&udc->lock); 1266 } 1267 else 1268 status = -ENODEV; 1269 if (status < 0) { 1270 stall: 1271 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1272 pkt.r.bRequestType, pkt.r.bRequest, status); 1273 csr |= AT91_UDP_FORCESTALL; 1274 __raw_writel(csr, creg); 1275 udc->req_pending = 0; 1276 } 1277 return; 1278 1279 succeed: 1280 /* immediate successful (IN) STATUS after zero length DATA */ 1281 PACKET("ep0 in/status\n"); 1282 write_in: 1283 csr |= AT91_UDP_TXPKTRDY; 1284 __raw_writel(csr, creg); 1285 udc->req_pending = 0; 1286 } 1287 1288 static void handle_ep0(struct at91_udc *udc) 1289 { 1290 struct at91_ep *ep0 = &udc->ep[0]; 1291 u32 __iomem *creg = ep0->creg; 1292 u32 csr = __raw_readl(creg); 1293 struct at91_request *req; 1294 1295 if (unlikely(csr & AT91_UDP_STALLSENT)) { 1296 nuke(ep0, -EPROTO); 1297 udc->req_pending = 0; 1298 csr |= CLR_FX; 1299 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); 1300 __raw_writel(csr, creg); 1301 VDBG("ep0 stalled\n"); 1302 csr = __raw_readl(creg); 1303 } 1304 if (csr & AT91_UDP_RXSETUP) { 1305 nuke(ep0, 0); 1306 udc->req_pending = 0; 1307 handle_setup(udc, ep0, csr); 1308 return; 1309 } 1310 1311 if (list_empty(&ep0->queue)) 1312 req = NULL; 1313 else 1314 req = list_entry(ep0->queue.next, struct at91_request, queue); 1315 1316 /* host ACKed an IN packet that we sent */ 1317 if (csr & AT91_UDP_TXCOMP) { 1318 csr |= CLR_FX; 1319 csr &= ~(SET_FX | AT91_UDP_TXCOMP); 1320 1321 /* write more IN DATA? */ 1322 if (req && ep0->is_in) { 1323 if (handle_ep(ep0)) 1324 udc->req_pending = 0; 1325 1326 /* 1327 * Ack after: 1328 * - last IN DATA packet (including GET_STATUS) 1329 * - IN/STATUS for OUT DATA 1330 * - IN/STATUS for any zero-length DATA stage 1331 * except for the IN DATA case, the host should send 1332 * an OUT status later, which we'll ack. 1333 */ 1334 } else { 1335 udc->req_pending = 0; 1336 __raw_writel(csr, creg); 1337 1338 /* 1339 * SET_ADDRESS takes effect only after the STATUS 1340 * (to the original address) gets acked. 1341 */ 1342 if (udc->wait_for_addr_ack) { 1343 u32 tmp; 1344 1345 at91_udp_write(udc, AT91_UDP_FADDR, 1346 AT91_UDP_FEN | udc->addr); 1347 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); 1348 tmp &= ~AT91_UDP_FADDEN; 1349 if (udc->addr) 1350 tmp |= AT91_UDP_FADDEN; 1351 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); 1352 1353 udc->wait_for_addr_ack = 0; 1354 VDBG("address %d\n", udc->addr); 1355 } 1356 } 1357 } 1358 1359 /* OUT packet arrived ... */ 1360 else if (csr & AT91_UDP_RX_DATA_BK0) { 1361 csr |= CLR_FX; 1362 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); 1363 1364 /* OUT DATA stage */ 1365 if (!ep0->is_in) { 1366 if (req) { 1367 if (handle_ep(ep0)) { 1368 /* send IN/STATUS */ 1369 PACKET("ep0 in/status\n"); 1370 csr = __raw_readl(creg); 1371 csr &= ~SET_FX; 1372 csr |= CLR_FX | AT91_UDP_TXPKTRDY; 1373 __raw_writel(csr, creg); 1374 udc->req_pending = 0; 1375 } 1376 } else if (udc->req_pending) { 1377 /* 1378 * AT91 hardware has a hard time with this 1379 * "deferred response" mode for control-OUT 1380 * transfers. (For control-IN it's fine.) 1381 * 1382 * The normal solution leaves OUT data in the 1383 * fifo until the gadget driver is ready. 1384 * We couldn't do that here without disabling 1385 * the IRQ that tells about SETUP packets, 1386 * e.g. when the host gets impatient... 1387 * 1388 * Working around it by copying into a buffer 1389 * would almost be a non-deferred response, 1390 * except that it wouldn't permit reliable 1391 * stalling of the request. Instead, demand 1392 * that gadget drivers not use this mode. 1393 */ 1394 DBG("no control-OUT deferred responses!\n"); 1395 __raw_writel(csr | AT91_UDP_FORCESTALL, creg); 1396 udc->req_pending = 0; 1397 } 1398 1399 /* STATUS stage for control-IN; ack. */ 1400 } else { 1401 PACKET("ep0 out/status ACK\n"); 1402 __raw_writel(csr, creg); 1403 1404 /* "early" status stage */ 1405 if (req) 1406 done(ep0, req, 0); 1407 } 1408 } 1409 } 1410 1411 static irqreturn_t at91_udc_irq (int irq, void *_udc) 1412 { 1413 struct at91_udc *udc = _udc; 1414 u32 rescans = 5; 1415 int disable_clock = 0; 1416 unsigned long flags; 1417 1418 spin_lock_irqsave(&udc->lock, flags); 1419 1420 if (!udc->clocked) { 1421 clk_on(udc); 1422 disable_clock = 1; 1423 } 1424 1425 while (rescans--) { 1426 u32 status; 1427 1428 status = at91_udp_read(udc, AT91_UDP_ISR) 1429 & at91_udp_read(udc, AT91_UDP_IMR); 1430 if (!status) 1431 break; 1432 1433 /* USB reset irq: not maskable */ 1434 if (status & AT91_UDP_ENDBUSRES) { 1435 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); 1436 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS); 1437 /* Atmel code clears this irq twice */ 1438 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1439 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); 1440 VDBG("end bus reset\n"); 1441 udc->addr = 0; 1442 reset_gadget(udc); 1443 1444 /* enable ep0 */ 1445 at91_udp_write(udc, AT91_UDP_CSR(0), 1446 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); 1447 udc->gadget.speed = USB_SPEED_FULL; 1448 udc->suspended = 0; 1449 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0)); 1450 1451 /* 1452 * NOTE: this driver keeps clocks off unless the 1453 * USB host is present. That saves power, but for 1454 * boards that don't support VBUS detection, both 1455 * clocks need to be active most of the time. 1456 */ 1457 1458 /* host initiated suspend (3+ms bus idle) */ 1459 } else if (status & AT91_UDP_RXSUSP) { 1460 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); 1461 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); 1462 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); 1463 /* VDBG("bus suspend\n"); */ 1464 if (udc->suspended) 1465 continue; 1466 udc->suspended = 1; 1467 1468 /* 1469 * NOTE: when suspending a VBUS-powered device, the 1470 * gadget driver should switch into slow clock mode 1471 * and then into standby to avoid drawing more than 1472 * 500uA power (2500uA for some high-power configs). 1473 */ 1474 if (udc->driver && udc->driver->suspend) { 1475 spin_unlock(&udc->lock); 1476 udc->driver->suspend(&udc->gadget); 1477 spin_lock(&udc->lock); 1478 } 1479 1480 /* host initiated resume */ 1481 } else if (status & AT91_UDP_RXRSM) { 1482 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); 1483 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP); 1484 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); 1485 /* VDBG("bus resume\n"); */ 1486 if (!udc->suspended) 1487 continue; 1488 udc->suspended = 0; 1489 1490 /* 1491 * NOTE: for a VBUS-powered device, the gadget driver 1492 * would normally want to switch out of slow clock 1493 * mode into normal mode. 1494 */ 1495 if (udc->driver && udc->driver->resume) { 1496 spin_unlock(&udc->lock); 1497 udc->driver->resume(&udc->gadget); 1498 spin_lock(&udc->lock); 1499 } 1500 1501 /* endpoint IRQs are cleared by handling them */ 1502 } else { 1503 int i; 1504 unsigned mask = 1; 1505 struct at91_ep *ep = &udc->ep[1]; 1506 1507 if (status & mask) 1508 handle_ep0(udc); 1509 for (i = 1; i < NUM_ENDPOINTS; i++) { 1510 mask <<= 1; 1511 if (status & mask) 1512 handle_ep(ep); 1513 ep++; 1514 } 1515 } 1516 } 1517 1518 if (disable_clock) 1519 clk_off(udc); 1520 1521 spin_unlock_irqrestore(&udc->lock, flags); 1522 1523 return IRQ_HANDLED; 1524 } 1525 1526 /*-------------------------------------------------------------------------*/ 1527 1528 static void at91_vbus_update(struct at91_udc *udc, unsigned value) 1529 { 1530 value ^= udc->board.vbus_active_low; 1531 if (value != udc->vbus) 1532 at91_vbus_session(&udc->gadget, value); 1533 } 1534 1535 static irqreturn_t at91_vbus_irq(int irq, void *_udc) 1536 { 1537 struct at91_udc *udc = _udc; 1538 1539 /* vbus needs at least brief debouncing */ 1540 udelay(10); 1541 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin)); 1542 1543 return IRQ_HANDLED; 1544 } 1545 1546 static void at91_vbus_timer_work(struct work_struct *work) 1547 { 1548 struct at91_udc *udc = container_of(work, struct at91_udc, 1549 vbus_timer_work); 1550 1551 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin)); 1552 1553 if (!timer_pending(&udc->vbus_timer)) 1554 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT); 1555 } 1556 1557 static void at91_vbus_timer(unsigned long data) 1558 { 1559 struct at91_udc *udc = (struct at91_udc *)data; 1560 1561 /* 1562 * If we are polling vbus it is likely that the gpio is on an 1563 * bus such as i2c or spi which may sleep, so schedule some work 1564 * to read the vbus gpio 1565 */ 1566 schedule_work(&udc->vbus_timer_work); 1567 } 1568 1569 static int at91_start(struct usb_gadget *gadget, 1570 struct usb_gadget_driver *driver) 1571 { 1572 struct at91_udc *udc; 1573 1574 udc = container_of(gadget, struct at91_udc, gadget); 1575 udc->driver = driver; 1576 udc->gadget.dev.of_node = udc->pdev->dev.of_node; 1577 udc->enabled = 1; 1578 udc->gadget.is_selfpowered = 1; 1579 1580 return 0; 1581 } 1582 1583 static int at91_stop(struct usb_gadget *gadget) 1584 { 1585 struct at91_udc *udc; 1586 unsigned long flags; 1587 1588 udc = container_of(gadget, struct at91_udc, gadget); 1589 spin_lock_irqsave(&udc->lock, flags); 1590 udc->enabled = 0; 1591 at91_udp_write(udc, AT91_UDP_IDR, ~0); 1592 spin_unlock_irqrestore(&udc->lock, flags); 1593 1594 udc->driver = NULL; 1595 1596 return 0; 1597 } 1598 1599 /*-------------------------------------------------------------------------*/ 1600 1601 static void at91udc_shutdown(struct platform_device *dev) 1602 { 1603 struct at91_udc *udc = platform_get_drvdata(dev); 1604 unsigned long flags; 1605 1606 /* force disconnect on reboot */ 1607 spin_lock_irqsave(&udc->lock, flags); 1608 pullup(platform_get_drvdata(dev), 0); 1609 spin_unlock_irqrestore(&udc->lock, flags); 1610 } 1611 1612 static int at91rm9200_udc_init(struct at91_udc *udc) 1613 { 1614 struct at91_ep *ep; 1615 int ret; 1616 int i; 1617 1618 for (i = 0; i < NUM_ENDPOINTS; i++) { 1619 ep = &udc->ep[i]; 1620 1621 switch (i) { 1622 case 0: 1623 case 3: 1624 ep->maxpacket = 8; 1625 break; 1626 case 1 ... 2: 1627 ep->maxpacket = 64; 1628 break; 1629 case 4 ... 5: 1630 ep->maxpacket = 256; 1631 break; 1632 } 1633 } 1634 1635 if (!gpio_is_valid(udc->board.pullup_pin)) { 1636 DBG("no D+ pullup?\n"); 1637 return -ENODEV; 1638 } 1639 1640 ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin, 1641 "udc_pullup"); 1642 if (ret) { 1643 DBG("D+ pullup is busy\n"); 1644 return ret; 1645 } 1646 1647 gpio_direction_output(udc->board.pullup_pin, 1648 udc->board.pullup_active_low); 1649 1650 return 0; 1651 } 1652 1653 static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on) 1654 { 1655 int active = !udc->board.pullup_active_low; 1656 1657 if (is_on) 1658 gpio_set_value(udc->board.pullup_pin, active); 1659 else 1660 gpio_set_value(udc->board.pullup_pin, !active); 1661 } 1662 1663 static const struct at91_udc_caps at91rm9200_udc_caps = { 1664 .init = at91rm9200_udc_init, 1665 .pullup = at91rm9200_udc_pullup, 1666 }; 1667 1668 static int at91sam9260_udc_init(struct at91_udc *udc) 1669 { 1670 struct at91_ep *ep; 1671 int i; 1672 1673 for (i = 0; i < NUM_ENDPOINTS; i++) { 1674 ep = &udc->ep[i]; 1675 1676 switch (i) { 1677 case 0 ... 3: 1678 ep->maxpacket = 64; 1679 break; 1680 case 4 ... 5: 1681 ep->maxpacket = 512; 1682 break; 1683 } 1684 } 1685 1686 return 0; 1687 } 1688 1689 static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on) 1690 { 1691 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); 1692 1693 if (is_on) 1694 txvc |= AT91_UDP_TXVC_PUON; 1695 else 1696 txvc &= ~AT91_UDP_TXVC_PUON; 1697 1698 at91_udp_write(udc, AT91_UDP_TXVC, txvc); 1699 } 1700 1701 static const struct at91_udc_caps at91sam9260_udc_caps = { 1702 .init = at91sam9260_udc_init, 1703 .pullup = at91sam9260_udc_pullup, 1704 }; 1705 1706 static int at91sam9261_udc_init(struct at91_udc *udc) 1707 { 1708 struct at91_ep *ep; 1709 int i; 1710 1711 for (i = 0; i < NUM_ENDPOINTS; i++) { 1712 ep = &udc->ep[i]; 1713 1714 switch (i) { 1715 case 0: 1716 ep->maxpacket = 8; 1717 break; 1718 case 1 ... 3: 1719 ep->maxpacket = 64; 1720 break; 1721 case 4 ... 5: 1722 ep->maxpacket = 256; 1723 break; 1724 } 1725 } 1726 1727 udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node, 1728 "atmel,matrix"); 1729 if (IS_ERR(udc->matrix)) 1730 return PTR_ERR(udc->matrix); 1731 1732 return 0; 1733 } 1734 1735 static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on) 1736 { 1737 u32 usbpucr = 0; 1738 1739 if (is_on) 1740 usbpucr = AT91_MATRIX_USBPUCR_PUON; 1741 1742 regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR, 1743 AT91_MATRIX_USBPUCR_PUON, usbpucr); 1744 } 1745 1746 static const struct at91_udc_caps at91sam9261_udc_caps = { 1747 .init = at91sam9261_udc_init, 1748 .pullup = at91sam9261_udc_pullup, 1749 }; 1750 1751 static int at91sam9263_udc_init(struct at91_udc *udc) 1752 { 1753 struct at91_ep *ep; 1754 int i; 1755 1756 for (i = 0; i < NUM_ENDPOINTS; i++) { 1757 ep = &udc->ep[i]; 1758 1759 switch (i) { 1760 case 0: 1761 case 1: 1762 case 2: 1763 case 3: 1764 ep->maxpacket = 64; 1765 break; 1766 case 4: 1767 case 5: 1768 ep->maxpacket = 256; 1769 break; 1770 } 1771 } 1772 1773 return 0; 1774 } 1775 1776 static const struct at91_udc_caps at91sam9263_udc_caps = { 1777 .init = at91sam9263_udc_init, 1778 .pullup = at91sam9260_udc_pullup, 1779 }; 1780 1781 static const struct of_device_id at91_udc_dt_ids[] = { 1782 { 1783 .compatible = "atmel,at91rm9200-udc", 1784 .data = &at91rm9200_udc_caps, 1785 }, 1786 { 1787 .compatible = "atmel,at91sam9260-udc", 1788 .data = &at91sam9260_udc_caps, 1789 }, 1790 { 1791 .compatible = "atmel,at91sam9261-udc", 1792 .data = &at91sam9261_udc_caps, 1793 }, 1794 { 1795 .compatible = "atmel,at91sam9263-udc", 1796 .data = &at91sam9263_udc_caps, 1797 }, 1798 { /* sentinel */ } 1799 }; 1800 MODULE_DEVICE_TABLE(of, at91_udc_dt_ids); 1801 1802 static void at91udc_of_init(struct at91_udc *udc, struct device_node *np) 1803 { 1804 struct at91_udc_data *board = &udc->board; 1805 const struct of_device_id *match; 1806 enum of_gpio_flags flags; 1807 u32 val; 1808 1809 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0) 1810 board->vbus_polled = 1; 1811 1812 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0, 1813 &flags); 1814 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1815 1816 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0, 1817 &flags); 1818 1819 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0; 1820 1821 match = of_match_node(at91_udc_dt_ids, np); 1822 if (match) 1823 udc->caps = match->data; 1824 } 1825 1826 static int at91udc_probe(struct platform_device *pdev) 1827 { 1828 struct device *dev = &pdev->dev; 1829 struct at91_udc *udc; 1830 int retval; 1831 struct resource *res; 1832 struct at91_ep *ep; 1833 int i; 1834 1835 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL); 1836 if (!udc) 1837 return -ENOMEM; 1838 1839 /* init software state */ 1840 udc->gadget.dev.parent = dev; 1841 at91udc_of_init(udc, pdev->dev.of_node); 1842 udc->pdev = pdev; 1843 udc->enabled = 0; 1844 spin_lock_init(&udc->lock); 1845 1846 udc->gadget.ops = &at91_udc_ops; 1847 udc->gadget.ep0 = &udc->ep[0].ep; 1848 udc->gadget.name = driver_name; 1849 udc->gadget.dev.init_name = "gadget"; 1850 1851 for (i = 0; i < NUM_ENDPOINTS; i++) { 1852 ep = &udc->ep[i]; 1853 ep->ep.name = ep_info[i].name; 1854 ep->ep.caps = ep_info[i].caps; 1855 ep->ep.ops = &at91_ep_ops; 1856 ep->udc = udc; 1857 ep->int_mask = BIT(i); 1858 if (i != 0 && i != 3) 1859 ep->is_pingpong = 1; 1860 } 1861 1862 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1863 udc->udp_baseaddr = devm_ioremap_resource(dev, res); 1864 if (IS_ERR(udc->udp_baseaddr)) 1865 return PTR_ERR(udc->udp_baseaddr); 1866 1867 if (udc->caps && udc->caps->init) { 1868 retval = udc->caps->init(udc); 1869 if (retval) 1870 return retval; 1871 } 1872 1873 udc_reinit(udc); 1874 1875 /* get interface and function clocks */ 1876 udc->iclk = devm_clk_get(dev, "pclk"); 1877 if (IS_ERR(udc->iclk)) 1878 return PTR_ERR(udc->iclk); 1879 1880 udc->fclk = devm_clk_get(dev, "hclk"); 1881 if (IS_ERR(udc->fclk)) 1882 return PTR_ERR(udc->fclk); 1883 1884 /* don't do anything until we have both gadget driver and VBUS */ 1885 clk_set_rate(udc->fclk, 48000000); 1886 retval = clk_prepare(udc->fclk); 1887 if (retval) 1888 return retval; 1889 1890 retval = clk_prepare_enable(udc->iclk); 1891 if (retval) 1892 goto err_unprepare_fclk; 1893 1894 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); 1895 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); 1896 /* Clear all pending interrupts - UDP may be used by bootloader. */ 1897 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); 1898 clk_disable(udc->iclk); 1899 1900 /* request UDC and maybe VBUS irqs */ 1901 udc->udp_irq = platform_get_irq(pdev, 0); 1902 retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0, 1903 driver_name, udc); 1904 if (retval) { 1905 DBG("request irq %d failed\n", udc->udp_irq); 1906 goto err_unprepare_iclk; 1907 } 1908 1909 if (gpio_is_valid(udc->board.vbus_pin)) { 1910 retval = devm_gpio_request(dev, udc->board.vbus_pin, 1911 "udc_vbus"); 1912 if (retval) { 1913 DBG("request vbus pin failed\n"); 1914 goto err_unprepare_iclk; 1915 } 1916 1917 gpio_direction_input(udc->board.vbus_pin); 1918 1919 /* 1920 * Get the initial state of VBUS - we cannot expect 1921 * a pending interrupt. 1922 */ 1923 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^ 1924 udc->board.vbus_active_low; 1925 1926 if (udc->board.vbus_polled) { 1927 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work); 1928 setup_timer(&udc->vbus_timer, at91_vbus_timer, 1929 (unsigned long)udc); 1930 mod_timer(&udc->vbus_timer, 1931 jiffies + VBUS_POLL_TIMEOUT); 1932 } else { 1933 retval = devm_request_irq(dev, 1934 gpio_to_irq(udc->board.vbus_pin), 1935 at91_vbus_irq, 0, driver_name, udc); 1936 if (retval) { 1937 DBG("request vbus irq %d failed\n", 1938 udc->board.vbus_pin); 1939 goto err_unprepare_iclk; 1940 } 1941 } 1942 } else { 1943 DBG("no VBUS detection, assuming always-on\n"); 1944 udc->vbus = 1; 1945 } 1946 retval = usb_add_gadget_udc(dev, &udc->gadget); 1947 if (retval) 1948 goto err_unprepare_iclk; 1949 dev_set_drvdata(dev, udc); 1950 device_init_wakeup(dev, 1); 1951 create_debug_file(udc); 1952 1953 INFO("%s version %s\n", driver_name, DRIVER_VERSION); 1954 return 0; 1955 1956 err_unprepare_iclk: 1957 clk_unprepare(udc->iclk); 1958 err_unprepare_fclk: 1959 clk_unprepare(udc->fclk); 1960 1961 DBG("%s probe failed, %d\n", driver_name, retval); 1962 1963 return retval; 1964 } 1965 1966 static int at91udc_remove(struct platform_device *pdev) 1967 { 1968 struct at91_udc *udc = platform_get_drvdata(pdev); 1969 unsigned long flags; 1970 1971 DBG("remove\n"); 1972 1973 usb_del_gadget_udc(&udc->gadget); 1974 if (udc->driver) 1975 return -EBUSY; 1976 1977 spin_lock_irqsave(&udc->lock, flags); 1978 pullup(udc, 0); 1979 spin_unlock_irqrestore(&udc->lock, flags); 1980 1981 device_init_wakeup(&pdev->dev, 0); 1982 remove_debug_file(udc); 1983 clk_unprepare(udc->fclk); 1984 clk_unprepare(udc->iclk); 1985 1986 return 0; 1987 } 1988 1989 #ifdef CONFIG_PM 1990 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) 1991 { 1992 struct at91_udc *udc = platform_get_drvdata(pdev); 1993 int wake = udc->driver && device_may_wakeup(&pdev->dev); 1994 unsigned long flags; 1995 1996 /* Unless we can act normally to the host (letting it wake us up 1997 * whenever it has work for us) force disconnect. Wakeup requires 1998 * PLLB for USB events (signaling for reset, wakeup, or incoming 1999 * tokens) and VBUS irqs (on systems which support them). 2000 */ 2001 if ((!udc->suspended && udc->addr) 2002 || !wake 2003 || at91_suspend_entering_slow_clock()) { 2004 spin_lock_irqsave(&udc->lock, flags); 2005 pullup(udc, 0); 2006 wake = 0; 2007 spin_unlock_irqrestore(&udc->lock, flags); 2008 } else 2009 enable_irq_wake(udc->udp_irq); 2010 2011 udc->active_suspend = wake; 2012 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake) 2013 enable_irq_wake(udc->board.vbus_pin); 2014 return 0; 2015 } 2016 2017 static int at91udc_resume(struct platform_device *pdev) 2018 { 2019 struct at91_udc *udc = platform_get_drvdata(pdev); 2020 unsigned long flags; 2021 2022 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && 2023 udc->active_suspend) 2024 disable_irq_wake(udc->board.vbus_pin); 2025 2026 /* maybe reconnect to host; if so, clocks on */ 2027 if (udc->active_suspend) 2028 disable_irq_wake(udc->udp_irq); 2029 else { 2030 spin_lock_irqsave(&udc->lock, flags); 2031 pullup(udc, 1); 2032 spin_unlock_irqrestore(&udc->lock, flags); 2033 } 2034 return 0; 2035 } 2036 #else 2037 #define at91udc_suspend NULL 2038 #define at91udc_resume NULL 2039 #endif 2040 2041 static struct platform_driver at91_udc_driver = { 2042 .remove = at91udc_remove, 2043 .shutdown = at91udc_shutdown, 2044 .suspend = at91udc_suspend, 2045 .resume = at91udc_resume, 2046 .driver = { 2047 .name = (char *) driver_name, 2048 .of_match_table = at91_udc_dt_ids, 2049 }, 2050 }; 2051 2052 module_platform_driver_probe(at91_udc_driver, at91udc_probe); 2053 2054 MODULE_DESCRIPTION("AT91 udc driver"); 2055 MODULE_AUTHOR("Thomas Rathbone, David Brownell"); 2056 MODULE_LICENSE("GPL"); 2057 MODULE_ALIAS("platform:at91_udc"); 2058