1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for the PLX NET2280 USB device controller. 4 * Specs and errata are available from <http://www.plxtech.com>. 5 * 6 * PLX Technology Inc. (formerly NetChip Technology) supported the 7 * development of this driver. 8 * 9 * 10 * CODE STATUS HIGHLIGHTS 11 * 12 * This driver should work well with most "gadget" drivers, including 13 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers 14 * as well as Gadget Zero and Gadgetfs. 15 * 16 * DMA is enabled by default. 17 * 18 * MSI is enabled by default. The legacy IRQ is used if MSI couldn't 19 * be enabled. 20 * 21 * Note that almost all the errata workarounds here are only needed for 22 * rev1 chips. Rev1a silicon (0110) fixes almost all of them. 23 */ 24 25 /* 26 * Copyright (C) 2003 David Brownell 27 * Copyright (C) 2003-2005 PLX Technology, Inc. 28 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS 29 * 30 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility 31 * with 2282 chip 32 * 33 * Modified Ricardo Ribalda Qtechnology AS to provide compatibility 34 * with usb 338x chip. Based on PLX driver 35 */ 36 37 #include <linux/module.h> 38 #include <linux/pci.h> 39 #include <linux/dma-mapping.h> 40 #include <linux/kernel.h> 41 #include <linux/delay.h> 42 #include <linux/ioport.h> 43 #include <linux/slab.h> 44 #include <linux/errno.h> 45 #include <linux/init.h> 46 #include <linux/timer.h> 47 #include <linux/list.h> 48 #include <linux/interrupt.h> 49 #include <linux/moduleparam.h> 50 #include <linux/device.h> 51 #include <linux/usb/ch9.h> 52 #include <linux/usb/gadget.h> 53 #include <linux/prefetch.h> 54 #include <linux/io.h> 55 #include <linux/iopoll.h> 56 57 #include <asm/byteorder.h> 58 #include <asm/irq.h> 59 #include <asm/unaligned.h> 60 61 #define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller" 62 #define DRIVER_VERSION "2005 Sept 27/v3.0" 63 64 #define EP_DONTUSE 13 /* nonzero */ 65 66 #define USE_RDK_LEDS /* GPIO pins control three LEDs */ 67 68 69 static const char driver_name[] = "net2280"; 70 static const char driver_desc[] = DRIVER_DESC; 71 72 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 }; 73 static const char ep0name[] = "ep0"; 74 75 #define EP_INFO(_name, _caps) \ 76 { \ 77 .name = _name, \ 78 .caps = _caps, \ 79 } 80 81 static const struct { 82 const char *name; 83 const struct usb_ep_caps caps; 84 } ep_info_dft[] = { /* Default endpoint configuration */ 85 EP_INFO(ep0name, 86 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 87 EP_INFO("ep-a", 88 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 89 EP_INFO("ep-b", 90 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 91 EP_INFO("ep-c", 92 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 93 EP_INFO("ep-d", 94 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 95 EP_INFO("ep-e", 96 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 97 EP_INFO("ep-f", 98 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 99 EP_INFO("ep-g", 100 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 101 EP_INFO("ep-h", 102 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)), 103 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */ 104 EP_INFO(ep0name, 105 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 106 EP_INFO("ep1in", 107 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 108 EP_INFO("ep2out", 109 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 110 EP_INFO("ep3in", 111 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 112 EP_INFO("ep4out", 113 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 114 EP_INFO("ep1out", 115 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 116 EP_INFO("ep2in", 117 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 118 EP_INFO("ep3out", 119 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 120 EP_INFO("ep4in", 121 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 122 }; 123 124 #undef EP_INFO 125 126 /* mode 0 == ep-{a,b,c,d} 1K fifo each 127 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable 128 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable 129 */ 130 static ushort fifo_mode; 131 132 /* "modprobe net2280 fifo_mode=1" etc */ 133 module_param(fifo_mode, ushort, 0644); 134 135 /* enable_suspend -- When enabled, the driver will respond to 136 * USB suspend requests by powering down the NET2280. Otherwise, 137 * USB suspend requests will be ignored. This is acceptable for 138 * self-powered devices 139 */ 140 static bool enable_suspend; 141 142 /* "modprobe net2280 enable_suspend=1" etc */ 143 module_param(enable_suspend, bool, 0444); 144 145 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") 146 147 static char *type_string(u8 bmAttributes) 148 { 149 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { 150 case USB_ENDPOINT_XFER_BULK: return "bulk"; 151 case USB_ENDPOINT_XFER_ISOC: return "iso"; 152 case USB_ENDPOINT_XFER_INT: return "intr"; 153 } 154 return "control"; 155 } 156 157 #include "net2280.h" 158 159 #define valid_bit cpu_to_le32(BIT(VALID_BIT)) 160 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE)) 161 162 static void ep_clear_seqnum(struct net2280_ep *ep); 163 static void stop_activity(struct net2280 *dev, 164 struct usb_gadget_driver *driver); 165 static void ep0_start(struct net2280 *dev); 166 167 /*-------------------------------------------------------------------------*/ 168 static inline void enable_pciirqenb(struct net2280_ep *ep) 169 { 170 u32 tmp = readl(&ep->dev->regs->pciirqenb0); 171 172 if (ep->dev->quirks & PLX_LEGACY) 173 tmp |= BIT(ep->num); 174 else 175 tmp |= BIT(ep_bit[ep->num]); 176 writel(tmp, &ep->dev->regs->pciirqenb0); 177 178 return; 179 } 180 181 static int 182 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) 183 { 184 struct net2280 *dev; 185 struct net2280_ep *ep; 186 u32 max; 187 u32 tmp = 0; 188 u32 type; 189 unsigned long flags; 190 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 }; 191 int ret = 0; 192 193 ep = container_of(_ep, struct net2280_ep, ep); 194 if (!_ep || !desc || ep->desc || _ep->name == ep0name || 195 desc->bDescriptorType != USB_DT_ENDPOINT) { 196 pr_err("%s: failed at line=%d\n", __func__, __LINE__); 197 return -EINVAL; 198 } 199 dev = ep->dev; 200 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { 201 ret = -ESHUTDOWN; 202 goto print_err; 203 } 204 205 /* erratum 0119 workaround ties up an endpoint number */ 206 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) { 207 ret = -EDOM; 208 goto print_err; 209 } 210 211 if (dev->quirks & PLX_PCIE) { 212 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) { 213 ret = -EDOM; 214 goto print_err; 215 } 216 ep->is_in = !!usb_endpoint_dir_in(desc); 217 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) { 218 ret = -EINVAL; 219 goto print_err; 220 } 221 } 222 223 /* sanity check ep-e/ep-f since their fifos are small */ 224 max = usb_endpoint_maxp(desc); 225 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) { 226 ret = -ERANGE; 227 goto print_err; 228 } 229 230 spin_lock_irqsave(&dev->lock, flags); 231 _ep->maxpacket = max; 232 ep->desc = desc; 233 234 /* ep_reset() has already been called */ 235 ep->stopped = 0; 236 ep->wedged = 0; 237 ep->out_overflow = 0; 238 239 /* set speed-dependent max packet; may kick in high bandwidth */ 240 set_max_speed(ep, max); 241 242 /* set type, direction, address; reset fifo counters */ 243 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat); 244 245 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) { 246 tmp = readl(&ep->cfg->ep_cfg); 247 /* If USB ep number doesn't match hardware ep number */ 248 if ((tmp & 0xf) != usb_endpoint_num(desc)) { 249 ret = -EINVAL; 250 spin_unlock_irqrestore(&dev->lock, flags); 251 goto print_err; 252 } 253 if (ep->is_in) 254 tmp &= ~USB3380_EP_CFG_MASK_IN; 255 else 256 tmp &= ~USB3380_EP_CFG_MASK_OUT; 257 } 258 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK); 259 if (type == USB_ENDPOINT_XFER_INT) { 260 /* erratum 0105 workaround prevents hs NYET */ 261 if (dev->chiprev == 0100 && 262 dev->gadget.speed == USB_SPEED_HIGH && 263 !(desc->bEndpointAddress & USB_DIR_IN)) 264 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE), 265 &ep->regs->ep_rsp); 266 } else if (type == USB_ENDPOINT_XFER_BULK) { 267 /* catch some particularly blatant driver bugs */ 268 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) || 269 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) || 270 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) { 271 spin_unlock_irqrestore(&dev->lock, flags); 272 ret = -ERANGE; 273 goto print_err; 274 } 275 } 276 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC); 277 /* Enable this endpoint */ 278 if (dev->quirks & PLX_LEGACY) { 279 tmp |= type << ENDPOINT_TYPE; 280 tmp |= desc->bEndpointAddress; 281 /* default full fifo lines */ 282 tmp |= (4 << ENDPOINT_BYTE_COUNT); 283 tmp |= BIT(ENDPOINT_ENABLE); 284 ep->is_in = (tmp & USB_DIR_IN) != 0; 285 } else { 286 /* In Legacy mode, only OUT endpoints are used */ 287 if (dev->enhanced_mode && ep->is_in) { 288 tmp |= type << IN_ENDPOINT_TYPE; 289 tmp |= BIT(IN_ENDPOINT_ENABLE); 290 } else { 291 tmp |= type << OUT_ENDPOINT_TYPE; 292 tmp |= BIT(OUT_ENDPOINT_ENABLE); 293 tmp |= (ep->is_in << ENDPOINT_DIRECTION); 294 } 295 296 tmp |= (4 << ENDPOINT_BYTE_COUNT); 297 if (!dev->enhanced_mode) 298 tmp |= usb_endpoint_num(desc); 299 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE); 300 } 301 302 /* Make sure all the registers are written before ep_rsp*/ 303 wmb(); 304 305 /* for OUT transfers, block the rx fifo until a read is posted */ 306 if (!ep->is_in) 307 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); 308 else if (!(dev->quirks & PLX_2280)) { 309 /* Added for 2282, Don't use nak packets on an in endpoint, 310 * this was ignored on 2280 311 */ 312 writel(BIT(CLEAR_NAK_OUT_PACKETS) | 313 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); 314 } 315 316 if (dev->quirks & PLX_PCIE) 317 ep_clear_seqnum(ep); 318 writel(tmp, &ep->cfg->ep_cfg); 319 320 /* enable irqs */ 321 if (!ep->dma) { /* pio, per-packet */ 322 enable_pciirqenb(ep); 323 324 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) | 325 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE); 326 if (dev->quirks & PLX_2280) 327 tmp |= readl(&ep->regs->ep_irqenb); 328 writel(tmp, &ep->regs->ep_irqenb); 329 } else { /* dma, per-request */ 330 tmp = BIT((8 + ep->num)); /* completion */ 331 tmp |= readl(&dev->regs->pciirqenb1); 332 writel(tmp, &dev->regs->pciirqenb1); 333 334 /* for short OUT transfers, dma completions can't 335 * advance the queue; do it pio-style, by hand. 336 * NOTE erratum 0112 workaround #2 337 */ 338 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { 339 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); 340 writel(tmp, &ep->regs->ep_irqenb); 341 342 enable_pciirqenb(ep); 343 } 344 } 345 346 tmp = desc->bEndpointAddress; 347 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n", 348 _ep->name, tmp & 0x0f, DIR_STRING(tmp), 349 type_string(desc->bmAttributes), 350 ep->dma ? "dma" : "pio", max); 351 352 /* pci writes may still be posted */ 353 spin_unlock_irqrestore(&dev->lock, flags); 354 return ret; 355 356 print_err: 357 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret); 358 return ret; 359 } 360 361 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec) 362 { 363 u32 result; 364 int ret; 365 366 ret = readl_poll_timeout_atomic(ptr, result, 367 ((result & mask) == done || 368 result == U32_MAX), 369 1, usec); 370 if (result == U32_MAX) /* device unplugged */ 371 return -ENODEV; 372 373 return ret; 374 } 375 376 static const struct usb_ep_ops net2280_ep_ops; 377 378 static void ep_reset_228x(struct net2280_regs __iomem *regs, 379 struct net2280_ep *ep) 380 { 381 u32 tmp; 382 383 ep->desc = NULL; 384 INIT_LIST_HEAD(&ep->queue); 385 386 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 387 ep->ep.ops = &net2280_ep_ops; 388 389 /* disable the dma, irqs, endpoint... */ 390 if (ep->dma) { 391 writel(0, &ep->dma->dmactl); 392 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) | 393 BIT(DMA_TRANSACTION_DONE_INTERRUPT) | 394 BIT(DMA_ABORT), 395 &ep->dma->dmastat); 396 397 tmp = readl(®s->pciirqenb0); 398 tmp &= ~BIT(ep->num); 399 writel(tmp, ®s->pciirqenb0); 400 } else { 401 tmp = readl(®s->pciirqenb1); 402 tmp &= ~BIT((8 + ep->num)); /* completion */ 403 writel(tmp, ®s->pciirqenb1); 404 } 405 writel(0, &ep->regs->ep_irqenb); 406 407 /* init to our chosen defaults, notably so that we NAK OUT 408 * packets until the driver queues a read (+note erratum 0112) 409 */ 410 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) { 411 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) | 412 BIT(SET_NAK_OUT_PACKETS) | 413 BIT(CLEAR_EP_HIDE_STATUS_PHASE) | 414 BIT(CLEAR_INTERRUPT_MODE); 415 } else { 416 /* added for 2282 */ 417 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) | 418 BIT(CLEAR_NAK_OUT_PACKETS) | 419 BIT(CLEAR_EP_HIDE_STATUS_PHASE) | 420 BIT(CLEAR_INTERRUPT_MODE); 421 } 422 423 if (ep->num != 0) { 424 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) | 425 BIT(CLEAR_ENDPOINT_HALT); 426 } 427 writel(tmp, &ep->regs->ep_rsp); 428 429 /* scrub most status bits, and flush any fifo state */ 430 if (ep->dev->quirks & PLX_2280) 431 tmp = BIT(FIFO_OVERFLOW) | 432 BIT(FIFO_UNDERFLOW); 433 else 434 tmp = 0; 435 436 writel(tmp | BIT(TIMEOUT) | 437 BIT(USB_STALL_SENT) | 438 BIT(USB_IN_NAK_SENT) | 439 BIT(USB_IN_ACK_RCVD) | 440 BIT(USB_OUT_PING_NAK_SENT) | 441 BIT(USB_OUT_ACK_SENT) | 442 BIT(FIFO_FLUSH) | 443 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) | 444 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) | 445 BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 446 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 447 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 448 BIT(DATA_IN_TOKEN_INTERRUPT), 449 &ep->regs->ep_stat); 450 451 /* fifo size is handled separately */ 452 } 453 454 static void ep_reset_338x(struct net2280_regs __iomem *regs, 455 struct net2280_ep *ep) 456 { 457 u32 tmp, dmastat; 458 459 ep->desc = NULL; 460 INIT_LIST_HEAD(&ep->queue); 461 462 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 463 ep->ep.ops = &net2280_ep_ops; 464 465 /* disable the dma, irqs, endpoint... */ 466 if (ep->dma) { 467 writel(0, &ep->dma->dmactl); 468 writel(BIT(DMA_ABORT_DONE_INTERRUPT) | 469 BIT(DMA_PAUSE_DONE_INTERRUPT) | 470 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) | 471 BIT(DMA_TRANSACTION_DONE_INTERRUPT), 472 /* | BIT(DMA_ABORT), */ 473 &ep->dma->dmastat); 474 475 dmastat = readl(&ep->dma->dmastat); 476 if (dmastat == 0x5002) { 477 ep_warn(ep->dev, "The dmastat return = %x!!\n", 478 dmastat); 479 writel(0x5a, &ep->dma->dmastat); 480 } 481 482 tmp = readl(®s->pciirqenb0); 483 tmp &= ~BIT(ep_bit[ep->num]); 484 writel(tmp, ®s->pciirqenb0); 485 } else { 486 if (ep->num < 5) { 487 tmp = readl(®s->pciirqenb1); 488 tmp &= ~BIT((8 + ep->num)); /* completion */ 489 writel(tmp, ®s->pciirqenb1); 490 } 491 } 492 writel(0, &ep->regs->ep_irqenb); 493 494 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) | 495 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) | 496 BIT(FIFO_OVERFLOW) | 497 BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 498 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 499 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 500 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat); 501 502 tmp = readl(&ep->cfg->ep_cfg); 503 if (ep->is_in) 504 tmp &= ~USB3380_EP_CFG_MASK_IN; 505 else 506 tmp &= ~USB3380_EP_CFG_MASK_OUT; 507 writel(tmp, &ep->cfg->ep_cfg); 508 } 509 510 static void nuke(struct net2280_ep *); 511 512 static int net2280_disable(struct usb_ep *_ep) 513 { 514 struct net2280_ep *ep; 515 unsigned long flags; 516 517 ep = container_of(_ep, struct net2280_ep, ep); 518 if (!_ep || _ep->name == ep0name) { 519 pr_err("%s: Invalid ep=%p\n", __func__, _ep); 520 return -EINVAL; 521 } 522 spin_lock_irqsave(&ep->dev->lock, flags); 523 nuke(ep); 524 525 if (ep->dev->quirks & PLX_PCIE) 526 ep_reset_338x(ep->dev->regs, ep); 527 else 528 ep_reset_228x(ep->dev->regs, ep); 529 530 ep_vdbg(ep->dev, "disabled %s %s\n", 531 ep->dma ? "dma" : "pio", _ep->name); 532 533 /* synch memory views with the device */ 534 (void)readl(&ep->cfg->ep_cfg); 535 536 if (!ep->dma && ep->num >= 1 && ep->num <= 4) 537 ep->dma = &ep->dev->dma[ep->num - 1]; 538 539 spin_unlock_irqrestore(&ep->dev->lock, flags); 540 return 0; 541 } 542 543 /*-------------------------------------------------------------------------*/ 544 545 static struct usb_request 546 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 547 { 548 struct net2280_ep *ep; 549 struct net2280_request *req; 550 551 if (!_ep) { 552 pr_err("%s: Invalid ep\n", __func__); 553 return NULL; 554 } 555 ep = container_of(_ep, struct net2280_ep, ep); 556 557 req = kzalloc(sizeof(*req), gfp_flags); 558 if (!req) 559 return NULL; 560 561 INIT_LIST_HEAD(&req->queue); 562 563 /* this dma descriptor may be swapped with the previous dummy */ 564 if (ep->dma) { 565 struct net2280_dma *td; 566 567 td = dma_pool_alloc(ep->dev->requests, gfp_flags, 568 &req->td_dma); 569 if (!td) { 570 kfree(req); 571 return NULL; 572 } 573 td->dmacount = 0; /* not VALID */ 574 td->dmadesc = td->dmaaddr; 575 req->td = td; 576 } 577 return &req->req; 578 } 579 580 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req) 581 { 582 struct net2280_ep *ep; 583 struct net2280_request *req; 584 585 ep = container_of(_ep, struct net2280_ep, ep); 586 if (!_ep || !_req) { 587 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n", 588 __func__, _ep, _req); 589 return; 590 } 591 592 req = container_of(_req, struct net2280_request, req); 593 WARN_ON(!list_empty(&req->queue)); 594 if (req->td) 595 dma_pool_free(ep->dev->requests, req->td, req->td_dma); 596 kfree(req); 597 } 598 599 /*-------------------------------------------------------------------------*/ 600 601 /* load a packet into the fifo we use for usb IN transfers. 602 * works for all endpoints. 603 * 604 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo 605 * at a time, but this code is simpler because it knows it only writes 606 * one packet. ep-a..ep-d should use dma instead. 607 */ 608 static void write_fifo(struct net2280_ep *ep, struct usb_request *req) 609 { 610 struct net2280_ep_regs __iomem *regs = ep->regs; 611 u8 *buf; 612 u32 tmp; 613 unsigned count, total; 614 615 /* INVARIANT: fifo is currently empty. (testable) */ 616 617 if (req) { 618 buf = req->buf + req->actual; 619 prefetch(buf); 620 total = req->length - req->actual; 621 } else { 622 total = 0; 623 buf = NULL; 624 } 625 626 /* write just one packet at a time */ 627 count = ep->ep.maxpacket; 628 if (count > total) /* min() cannot be used on a bitfield */ 629 count = total; 630 631 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", 632 ep->ep.name, count, 633 (count != ep->ep.maxpacket) ? " (short)" : "", 634 req); 635 while (count >= 4) { 636 /* NOTE be careful if you try to align these. fifo lines 637 * should normally be full (4 bytes) and successive partial 638 * lines are ok only in certain cases. 639 */ 640 tmp = get_unaligned((u32 *)buf); 641 cpu_to_le32s(&tmp); 642 writel(tmp, ®s->ep_data); 643 buf += 4; 644 count -= 4; 645 } 646 647 /* last fifo entry is "short" unless we wrote a full packet. 648 * also explicitly validate last word in (periodic) transfers 649 * when maxpacket is not a multiple of 4 bytes. 650 */ 651 if (count || total < ep->ep.maxpacket) { 652 tmp = count ? get_unaligned((u32 *)buf) : count; 653 cpu_to_le32s(&tmp); 654 set_fifo_bytecount(ep, count & 0x03); 655 writel(tmp, ®s->ep_data); 656 } 657 658 /* pci writes may still be posted */ 659 } 660 661 /* work around erratum 0106: PCI and USB race over the OUT fifo. 662 * caller guarantees chiprev 0100, out endpoint is NAKing, and 663 * there's no real data in the fifo. 664 * 665 * NOTE: also used in cases where that erratum doesn't apply: 666 * where the host wrote "too much" data to us. 667 */ 668 static void out_flush(struct net2280_ep *ep) 669 { 670 u32 __iomem *statp; 671 u32 tmp; 672 673 statp = &ep->regs->ep_stat; 674 675 tmp = readl(statp); 676 if (tmp & BIT(NAK_OUT_PACKETS)) { 677 ep_dbg(ep->dev, "%s %s %08x !NAK\n", 678 ep->ep.name, __func__, tmp); 679 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); 680 } 681 682 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 683 BIT(DATA_PACKET_RECEIVED_INTERRUPT), 684 statp); 685 writel(BIT(FIFO_FLUSH), statp); 686 /* Make sure that stap is written */ 687 mb(); 688 tmp = readl(statp); 689 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) && 690 /* high speed did bulk NYET; fifo isn't filling */ 691 ep->dev->gadget.speed == USB_SPEED_FULL) { 692 unsigned usec; 693 694 usec = 50; /* 64 byte bulk/interrupt */ 695 handshake(statp, BIT(USB_OUT_PING_NAK_SENT), 696 BIT(USB_OUT_PING_NAK_SENT), usec); 697 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ 698 } 699 } 700 701 /* unload packet(s) from the fifo we use for usb OUT transfers. 702 * returns true iff the request completed, because of short packet 703 * or the request buffer having filled with full packets. 704 * 705 * for ep-a..ep-d this will read multiple packets out when they 706 * have been accepted. 707 */ 708 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req) 709 { 710 struct net2280_ep_regs __iomem *regs = ep->regs; 711 u8 *buf = req->req.buf + req->req.actual; 712 unsigned count, tmp, is_short; 713 unsigned cleanup = 0, prevent = 0; 714 715 /* erratum 0106 ... packets coming in during fifo reads might 716 * be incompletely rejected. not all cases have workarounds. 717 */ 718 if (ep->dev->chiprev == 0x0100 && 719 ep->dev->gadget.speed == USB_SPEED_FULL) { 720 udelay(1); 721 tmp = readl(&ep->regs->ep_stat); 722 if ((tmp & BIT(NAK_OUT_PACKETS))) 723 cleanup = 1; 724 else if ((tmp & BIT(FIFO_FULL))) { 725 start_out_naking(ep); 726 prevent = 1; 727 } 728 /* else: hope we don't see the problem */ 729 } 730 731 /* never overflow the rx buffer. the fifo reads packets until 732 * it sees a short one; we might not be ready for them all. 733 */ 734 prefetchw(buf); 735 count = readl(®s->ep_avail); 736 if (unlikely(count == 0)) { 737 udelay(1); 738 tmp = readl(&ep->regs->ep_stat); 739 count = readl(®s->ep_avail); 740 /* handled that data already? */ 741 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0) 742 return 0; 743 } 744 745 tmp = req->req.length - req->req.actual; 746 if (count > tmp) { 747 /* as with DMA, data overflow gets flushed */ 748 if ((tmp % ep->ep.maxpacket) != 0) { 749 ep_err(ep->dev, 750 "%s out fifo %d bytes, expected %d\n", 751 ep->ep.name, count, tmp); 752 req->req.status = -EOVERFLOW; 753 cleanup = 1; 754 /* NAK_OUT_PACKETS will be set, so flushing is safe; 755 * the next read will start with the next packet 756 */ 757 } /* else it's a ZLP, no worries */ 758 count = tmp; 759 } 760 req->req.actual += count; 761 762 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); 763 764 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", 765 ep->ep.name, count, is_short ? " (short)" : "", 766 cleanup ? " flush" : "", prevent ? " nak" : "", 767 req, req->req.actual, req->req.length); 768 769 while (count >= 4) { 770 tmp = readl(®s->ep_data); 771 cpu_to_le32s(&tmp); 772 put_unaligned(tmp, (u32 *)buf); 773 buf += 4; 774 count -= 4; 775 } 776 if (count) { 777 tmp = readl(®s->ep_data); 778 /* LE conversion is implicit here: */ 779 do { 780 *buf++ = (u8) tmp; 781 tmp >>= 8; 782 } while (--count); 783 } 784 if (cleanup) 785 out_flush(ep); 786 if (prevent) { 787 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); 788 (void) readl(&ep->regs->ep_rsp); 789 } 790 791 return is_short || req->req.actual == req->req.length; 792 } 793 794 /* fill out dma descriptor to match a given request */ 795 static void fill_dma_desc(struct net2280_ep *ep, 796 struct net2280_request *req, int valid) 797 { 798 struct net2280_dma *td = req->td; 799 u32 dmacount = req->req.length; 800 801 /* don't let DMA continue after a short OUT packet, 802 * so overruns can't affect the next transfer. 803 * in case of overruns on max-size packets, we can't 804 * stop the fifo from filling but we can flush it. 805 */ 806 if (ep->is_in) 807 dmacount |= BIT(DMA_DIRECTION); 808 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) || 809 !(ep->dev->quirks & PLX_2280)) 810 dmacount |= BIT(END_OF_CHAIN); 811 812 req->valid = valid; 813 if (valid) 814 dmacount |= BIT(VALID_BIT); 815 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE); 816 817 /* td->dmadesc = previously set by caller */ 818 td->dmaaddr = cpu_to_le32 (req->req.dma); 819 820 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ 821 wmb(); 822 td->dmacount = cpu_to_le32(dmacount); 823 } 824 825 static const u32 dmactl_default = 826 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) | 827 BIT(DMA_CLEAR_COUNT_ENABLE) | 828 /* erratum 0116 workaround part 1 (use POLLING) */ 829 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) | 830 BIT(DMA_VALID_BIT_POLLING_ENABLE) | 831 BIT(DMA_VALID_BIT_ENABLE) | 832 BIT(DMA_SCATTER_GATHER_ENABLE) | 833 /* erratum 0116 workaround part 2 (no AUTOSTART) */ 834 BIT(DMA_ENABLE); 835 836 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma) 837 { 838 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50); 839 } 840 841 static inline void stop_dma(struct net2280_dma_regs __iomem *dma) 842 { 843 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl); 844 spin_stop_dma(dma); 845 } 846 847 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma) 848 { 849 struct net2280_dma_regs __iomem *dma = ep->dma; 850 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION); 851 852 if (!(ep->dev->quirks & PLX_2280)) 853 tmp |= BIT(END_OF_CHAIN); 854 855 writel(tmp, &dma->dmacount); 856 writel(readl(&dma->dmastat), &dma->dmastat); 857 858 writel(td_dma, &dma->dmadesc); 859 if (ep->dev->quirks & PLX_PCIE) 860 dmactl |= BIT(DMA_REQUEST_OUTSTANDING); 861 writel(dmactl, &dma->dmactl); 862 863 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ 864 (void) readl(&ep->dev->pci->pcimstctl); 865 866 writel(BIT(DMA_START), &dma->dmastat); 867 } 868 869 static void start_dma(struct net2280_ep *ep, struct net2280_request *req) 870 { 871 u32 tmp; 872 struct net2280_dma_regs __iomem *dma = ep->dma; 873 874 /* FIXME can't use DMA for ZLPs */ 875 876 /* on this path we "know" there's no dma active (yet) */ 877 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE)); 878 writel(0, &ep->dma->dmactl); 879 880 /* previous OUT packet might have been short */ 881 if (!ep->is_in && (readl(&ep->regs->ep_stat) & 882 BIT(NAK_OUT_PACKETS))) { 883 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT), 884 &ep->regs->ep_stat); 885 886 tmp = readl(&ep->regs->ep_avail); 887 if (tmp) { 888 writel(readl(&dma->dmastat), &dma->dmastat); 889 890 /* transfer all/some fifo data */ 891 writel(req->req.dma, &dma->dmaaddr); 892 tmp = min(tmp, req->req.length); 893 894 /* dma irq, faking scatterlist status */ 895 req->td->dmacount = cpu_to_le32(req->req.length - tmp); 896 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp, 897 &dma->dmacount); 898 req->td->dmadesc = 0; 899 req->valid = 1; 900 901 writel(BIT(DMA_ENABLE), &dma->dmactl); 902 writel(BIT(DMA_START), &dma->dmastat); 903 return; 904 } 905 stop_out_naking(ep); 906 } 907 908 tmp = dmactl_default; 909 910 /* force packet boundaries between dma requests, but prevent the 911 * controller from automagically writing a last "short" packet 912 * (zero length) unless the driver explicitly said to do that. 913 */ 914 if (ep->is_in) { 915 if (likely((req->req.length % ep->ep.maxpacket) || 916 req->req.zero)){ 917 tmp |= BIT(DMA_FIFO_VALIDATE); 918 ep->in_fifo_validate = 1; 919 } else 920 ep->in_fifo_validate = 0; 921 } 922 923 /* init req->td, pointing to the current dummy */ 924 req->td->dmadesc = cpu_to_le32 (ep->td_dma); 925 fill_dma_desc(ep, req, 1); 926 927 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN)); 928 929 start_queue(ep, tmp, req->td_dma); 930 } 931 932 static inline void 933 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid) 934 { 935 /* swap new dummy for old, link; fill and maybe activate */ 936 swap(ep->dummy, req->td); 937 swap(ep->td_dma, req->td_dma); 938 939 req->td->dmadesc = cpu_to_le32 (ep->td_dma); 940 941 fill_dma_desc(ep, req, valid); 942 } 943 944 static void 945 done(struct net2280_ep *ep, struct net2280_request *req, int status) 946 { 947 struct net2280 *dev; 948 unsigned stopped = ep->stopped; 949 950 list_del_init(&req->queue); 951 952 if (req->req.status == -EINPROGRESS) 953 req->req.status = status; 954 else 955 status = req->req.status; 956 957 dev = ep->dev; 958 if (ep->dma) 959 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in); 960 961 if (status && status != -ESHUTDOWN) 962 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n", 963 ep->ep.name, &req->req, status, 964 req->req.actual, req->req.length); 965 966 /* don't modify queue heads during completion callback */ 967 ep->stopped = 1; 968 spin_unlock(&dev->lock); 969 usb_gadget_giveback_request(&ep->ep, &req->req); 970 spin_lock(&dev->lock); 971 ep->stopped = stopped; 972 } 973 974 /*-------------------------------------------------------------------------*/ 975 976 static int 977 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) 978 { 979 struct net2280_request *req; 980 struct net2280_ep *ep; 981 struct net2280 *dev; 982 unsigned long flags; 983 int ret = 0; 984 985 /* we always require a cpu-view buffer, so that we can 986 * always use pio (as fallback or whatever). 987 */ 988 ep = container_of(_ep, struct net2280_ep, ep); 989 if (!_ep || (!ep->desc && ep->num != 0)) { 990 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep); 991 return -EINVAL; 992 } 993 req = container_of(_req, struct net2280_request, req); 994 if (!_req || !_req->complete || !_req->buf || 995 !list_empty(&req->queue)) { 996 ret = -EINVAL; 997 goto print_err; 998 } 999 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) { 1000 ret = -EDOM; 1001 goto print_err; 1002 } 1003 dev = ep->dev; 1004 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { 1005 ret = -ESHUTDOWN; 1006 goto print_err; 1007 } 1008 1009 /* FIXME implement PIO fallback for ZLPs with DMA */ 1010 if (ep->dma && _req->length == 0) { 1011 ret = -EOPNOTSUPP; 1012 goto print_err; 1013 } 1014 1015 /* set up dma mapping in case the caller didn't */ 1016 if (ep->dma) { 1017 ret = usb_gadget_map_request(&dev->gadget, _req, 1018 ep->is_in); 1019 if (ret) 1020 goto print_err; 1021 } 1022 1023 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n", 1024 _ep->name, _req, _req->length, _req->buf); 1025 1026 spin_lock_irqsave(&dev->lock, flags); 1027 1028 _req->status = -EINPROGRESS; 1029 _req->actual = 0; 1030 1031 /* kickstart this i/o queue? */ 1032 if (list_empty(&ep->queue) && !ep->stopped && 1033 !((dev->quirks & PLX_PCIE) && ep->dma && 1034 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) { 1035 1036 /* use DMA if the endpoint supports it, else pio */ 1037 if (ep->dma) 1038 start_dma(ep, req); 1039 else { 1040 /* maybe there's no control data, just status ack */ 1041 if (ep->num == 0 && _req->length == 0) { 1042 allow_status(ep); 1043 done(ep, req, 0); 1044 ep_vdbg(dev, "%s status ack\n", ep->ep.name); 1045 goto done; 1046 } 1047 1048 /* PIO ... stuff the fifo, or unblock it. */ 1049 if (ep->is_in) 1050 write_fifo(ep, _req); 1051 else { 1052 u32 s; 1053 1054 /* OUT FIFO might have packet(s) buffered */ 1055 s = readl(&ep->regs->ep_stat); 1056 if ((s & BIT(FIFO_EMPTY)) == 0) { 1057 /* note: _req->short_not_ok is 1058 * ignored here since PIO _always_ 1059 * stops queue advance here, and 1060 * _req->status doesn't change for 1061 * short reads (only _req->actual) 1062 */ 1063 if (read_fifo(ep, req) && 1064 ep->num == 0) { 1065 done(ep, req, 0); 1066 allow_status(ep); 1067 /* don't queue it */ 1068 req = NULL; 1069 } else if (read_fifo(ep, req) && 1070 ep->num != 0) { 1071 done(ep, req, 0); 1072 req = NULL; 1073 } else 1074 s = readl(&ep->regs->ep_stat); 1075 } 1076 1077 /* don't NAK, let the fifo fill */ 1078 if (req && (s & BIT(NAK_OUT_PACKETS))) 1079 writel(BIT(CLEAR_NAK_OUT_PACKETS), 1080 &ep->regs->ep_rsp); 1081 } 1082 } 1083 1084 } else if (ep->dma) { 1085 int valid = 1; 1086 1087 if (ep->is_in) { 1088 int expect; 1089 1090 /* preventing magic zlps is per-engine state, not 1091 * per-transfer; irq logic must recover hiccups. 1092 */ 1093 expect = likely(req->req.zero || 1094 (req->req.length % ep->ep.maxpacket)); 1095 if (expect != ep->in_fifo_validate) 1096 valid = 0; 1097 } 1098 queue_dma(ep, req, valid); 1099 1100 } /* else the irq handler advances the queue. */ 1101 1102 ep->responded = 1; 1103 if (req) 1104 list_add_tail(&req->queue, &ep->queue); 1105 done: 1106 spin_unlock_irqrestore(&dev->lock, flags); 1107 1108 /* pci writes may still be posted */ 1109 return ret; 1110 1111 print_err: 1112 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret); 1113 return ret; 1114 } 1115 1116 static inline void 1117 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount, 1118 int status) 1119 { 1120 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); 1121 done(ep, req, status); 1122 } 1123 1124 static int scan_dma_completions(struct net2280_ep *ep) 1125 { 1126 int num_completed = 0; 1127 1128 /* only look at descriptors that were "naturally" retired, 1129 * so fifo and list head state won't matter 1130 */ 1131 while (!list_empty(&ep->queue)) { 1132 struct net2280_request *req; 1133 u32 req_dma_count; 1134 1135 req = list_entry(ep->queue.next, 1136 struct net2280_request, queue); 1137 if (!req->valid) 1138 break; 1139 rmb(); 1140 req_dma_count = le32_to_cpup(&req->td->dmacount); 1141 if ((req_dma_count & BIT(VALID_BIT)) != 0) 1142 break; 1143 1144 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" 1145 * cases where DMA must be aborted; this code handles 1146 * all non-abort DMA completions. 1147 */ 1148 if (unlikely(req->td->dmadesc == 0)) { 1149 /* paranoia */ 1150 u32 const ep_dmacount = readl(&ep->dma->dmacount); 1151 1152 if (ep_dmacount & DMA_BYTE_COUNT_MASK) 1153 break; 1154 /* single transfer mode */ 1155 dma_done(ep, req, req_dma_count, 0); 1156 num_completed++; 1157 break; 1158 } else if (!ep->is_in && 1159 (req->req.length % ep->ep.maxpacket) && 1160 !(ep->dev->quirks & PLX_PCIE)) { 1161 1162 u32 const ep_stat = readl(&ep->regs->ep_stat); 1163 /* AVOID TROUBLE HERE by not issuing short reads from 1164 * your gadget driver. That helps avoids errata 0121, 1165 * 0122, and 0124; not all cases trigger the warning. 1166 */ 1167 if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) { 1168 ep_warn(ep->dev, "%s lost packet sync!\n", 1169 ep->ep.name); 1170 req->req.status = -EOVERFLOW; 1171 } else { 1172 u32 const ep_avail = readl(&ep->regs->ep_avail); 1173 if (ep_avail) { 1174 /* fifo gets flushed later */ 1175 ep->out_overflow = 1; 1176 ep_dbg(ep->dev, 1177 "%s dma, discard %d len %d\n", 1178 ep->ep.name, ep_avail, 1179 req->req.length); 1180 req->req.status = -EOVERFLOW; 1181 } 1182 } 1183 } 1184 dma_done(ep, req, req_dma_count, 0); 1185 num_completed++; 1186 } 1187 1188 return num_completed; 1189 } 1190 1191 static void restart_dma(struct net2280_ep *ep) 1192 { 1193 struct net2280_request *req; 1194 1195 if (ep->stopped) 1196 return; 1197 req = list_entry(ep->queue.next, struct net2280_request, queue); 1198 1199 start_dma(ep, req); 1200 } 1201 1202 static void abort_dma(struct net2280_ep *ep) 1203 { 1204 /* abort the current transfer */ 1205 if (likely(!list_empty(&ep->queue))) { 1206 /* FIXME work around errata 0121, 0122, 0124 */ 1207 writel(BIT(DMA_ABORT), &ep->dma->dmastat); 1208 spin_stop_dma(ep->dma); 1209 } else 1210 stop_dma(ep->dma); 1211 scan_dma_completions(ep); 1212 } 1213 1214 /* dequeue ALL requests */ 1215 static void nuke(struct net2280_ep *ep) 1216 { 1217 struct net2280_request *req; 1218 1219 /* called with spinlock held */ 1220 ep->stopped = 1; 1221 if (ep->dma) 1222 abort_dma(ep); 1223 while (!list_empty(&ep->queue)) { 1224 req = list_entry(ep->queue.next, 1225 struct net2280_request, 1226 queue); 1227 done(ep, req, -ESHUTDOWN); 1228 } 1229 } 1230 1231 /* dequeue JUST ONE request */ 1232 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req) 1233 { 1234 struct net2280_ep *ep; 1235 struct net2280_request *req = NULL; 1236 struct net2280_request *iter; 1237 unsigned long flags; 1238 u32 dmactl; 1239 int stopped; 1240 1241 ep = container_of(_ep, struct net2280_ep, ep); 1242 if (!_ep || (!ep->desc && ep->num != 0) || !_req) { 1243 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n", 1244 __func__, _ep, _req); 1245 return -EINVAL; 1246 } 1247 1248 spin_lock_irqsave(&ep->dev->lock, flags); 1249 stopped = ep->stopped; 1250 1251 /* quiesce dma while we patch the queue */ 1252 dmactl = 0; 1253 ep->stopped = 1; 1254 if (ep->dma) { 1255 dmactl = readl(&ep->dma->dmactl); 1256 /* WARNING erratum 0127 may kick in ... */ 1257 stop_dma(ep->dma); 1258 scan_dma_completions(ep); 1259 } 1260 1261 /* make sure it's still queued on this endpoint */ 1262 list_for_each_entry(iter, &ep->queue, queue) { 1263 if (&iter->req != _req) 1264 continue; 1265 req = iter; 1266 break; 1267 } 1268 if (!req) { 1269 ep->stopped = stopped; 1270 spin_unlock_irqrestore(&ep->dev->lock, flags); 1271 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__); 1272 return -EINVAL; 1273 } 1274 1275 /* queue head may be partially complete. */ 1276 if (ep->queue.next == &req->queue) { 1277 if (ep->dma) { 1278 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name); 1279 _req->status = -ECONNRESET; 1280 abort_dma(ep); 1281 if (likely(ep->queue.next == &req->queue)) { 1282 /* NOTE: misreports single-transfer mode*/ 1283 req->td->dmacount = 0; /* invalidate */ 1284 dma_done(ep, req, 1285 readl(&ep->dma->dmacount), 1286 -ECONNRESET); 1287 } 1288 } else { 1289 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name); 1290 done(ep, req, -ECONNRESET); 1291 } 1292 req = NULL; 1293 } 1294 1295 if (req) 1296 done(ep, req, -ECONNRESET); 1297 ep->stopped = stopped; 1298 1299 if (ep->dma) { 1300 /* turn off dma on inactive queues */ 1301 if (list_empty(&ep->queue)) 1302 stop_dma(ep->dma); 1303 else if (!ep->stopped) { 1304 /* resume current request, or start new one */ 1305 if (req) 1306 writel(dmactl, &ep->dma->dmactl); 1307 else 1308 start_dma(ep, list_entry(ep->queue.next, 1309 struct net2280_request, queue)); 1310 } 1311 } 1312 1313 spin_unlock_irqrestore(&ep->dev->lock, flags); 1314 return 0; 1315 } 1316 1317 /*-------------------------------------------------------------------------*/ 1318 1319 static int net2280_fifo_status(struct usb_ep *_ep); 1320 1321 static int 1322 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 1323 { 1324 struct net2280_ep *ep; 1325 unsigned long flags; 1326 int retval = 0; 1327 1328 ep = container_of(_ep, struct net2280_ep, ep); 1329 if (!_ep || (!ep->desc && ep->num != 0)) { 1330 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep); 1331 return -EINVAL; 1332 } 1333 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) { 1334 retval = -ESHUTDOWN; 1335 goto print_err; 1336 } 1337 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) 1338 == USB_ENDPOINT_XFER_ISOC) { 1339 retval = -EINVAL; 1340 goto print_err; 1341 } 1342 1343 spin_lock_irqsave(&ep->dev->lock, flags); 1344 if (!list_empty(&ep->queue)) { 1345 retval = -EAGAIN; 1346 goto print_unlock; 1347 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) { 1348 retval = -EAGAIN; 1349 goto print_unlock; 1350 } else { 1351 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name, 1352 value ? "set" : "clear", 1353 wedged ? "wedge" : "halt"); 1354 /* set/clear, then synch memory views with the device */ 1355 if (value) { 1356 if (ep->num == 0) 1357 ep->dev->protocol_stall = 1; 1358 else 1359 set_halt(ep); 1360 if (wedged) 1361 ep->wedged = 1; 1362 } else { 1363 clear_halt(ep); 1364 if (ep->dev->quirks & PLX_PCIE && 1365 !list_empty(&ep->queue) && ep->td_dma) 1366 restart_dma(ep); 1367 ep->wedged = 0; 1368 } 1369 (void) readl(&ep->regs->ep_rsp); 1370 } 1371 spin_unlock_irqrestore(&ep->dev->lock, flags); 1372 1373 return retval; 1374 1375 print_unlock: 1376 spin_unlock_irqrestore(&ep->dev->lock, flags); 1377 print_err: 1378 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval); 1379 return retval; 1380 } 1381 1382 static int net2280_set_halt(struct usb_ep *_ep, int value) 1383 { 1384 return net2280_set_halt_and_wedge(_ep, value, 0); 1385 } 1386 1387 static int net2280_set_wedge(struct usb_ep *_ep) 1388 { 1389 if (!_ep || _ep->name == ep0name) { 1390 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep); 1391 return -EINVAL; 1392 } 1393 return net2280_set_halt_and_wedge(_ep, 1, 1); 1394 } 1395 1396 static int net2280_fifo_status(struct usb_ep *_ep) 1397 { 1398 struct net2280_ep *ep; 1399 u32 avail; 1400 1401 ep = container_of(_ep, struct net2280_ep, ep); 1402 if (!_ep || (!ep->desc && ep->num != 0)) { 1403 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep); 1404 return -ENODEV; 1405 } 1406 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) { 1407 dev_err(&ep->dev->pdev->dev, 1408 "%s: Invalid driver=%p or speed=%d\n", 1409 __func__, ep->dev->driver, ep->dev->gadget.speed); 1410 return -ESHUTDOWN; 1411 } 1412 1413 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1); 1414 if (avail > ep->fifo_size) { 1415 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__); 1416 return -EOVERFLOW; 1417 } 1418 if (ep->is_in) 1419 avail = ep->fifo_size - avail; 1420 return avail; 1421 } 1422 1423 static void net2280_fifo_flush(struct usb_ep *_ep) 1424 { 1425 struct net2280_ep *ep; 1426 1427 ep = container_of(_ep, struct net2280_ep, ep); 1428 if (!_ep || (!ep->desc && ep->num != 0)) { 1429 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep); 1430 return; 1431 } 1432 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) { 1433 dev_err(&ep->dev->pdev->dev, 1434 "%s: Invalid driver=%p or speed=%d\n", 1435 __func__, ep->dev->driver, ep->dev->gadget.speed); 1436 return; 1437 } 1438 1439 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat); 1440 (void) readl(&ep->regs->ep_rsp); 1441 } 1442 1443 static const struct usb_ep_ops net2280_ep_ops = { 1444 .enable = net2280_enable, 1445 .disable = net2280_disable, 1446 1447 .alloc_request = net2280_alloc_request, 1448 .free_request = net2280_free_request, 1449 1450 .queue = net2280_queue, 1451 .dequeue = net2280_dequeue, 1452 1453 .set_halt = net2280_set_halt, 1454 .set_wedge = net2280_set_wedge, 1455 .fifo_status = net2280_fifo_status, 1456 .fifo_flush = net2280_fifo_flush, 1457 }; 1458 1459 /*-------------------------------------------------------------------------*/ 1460 1461 static int net2280_get_frame(struct usb_gadget *_gadget) 1462 { 1463 struct net2280 *dev; 1464 unsigned long flags; 1465 u16 retval; 1466 1467 if (!_gadget) 1468 return -ENODEV; 1469 dev = container_of(_gadget, struct net2280, gadget); 1470 spin_lock_irqsave(&dev->lock, flags); 1471 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff; 1472 spin_unlock_irqrestore(&dev->lock, flags); 1473 return retval; 1474 } 1475 1476 static int net2280_wakeup(struct usb_gadget *_gadget) 1477 { 1478 struct net2280 *dev; 1479 u32 tmp; 1480 unsigned long flags; 1481 1482 if (!_gadget) 1483 return 0; 1484 dev = container_of(_gadget, struct net2280, gadget); 1485 1486 spin_lock_irqsave(&dev->lock, flags); 1487 tmp = readl(&dev->usb->usbctl); 1488 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE)) 1489 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat); 1490 spin_unlock_irqrestore(&dev->lock, flags); 1491 1492 /* pci writes may still be posted */ 1493 return 0; 1494 } 1495 1496 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value) 1497 { 1498 struct net2280 *dev; 1499 u32 tmp; 1500 unsigned long flags; 1501 1502 if (!_gadget) 1503 return 0; 1504 dev = container_of(_gadget, struct net2280, gadget); 1505 1506 spin_lock_irqsave(&dev->lock, flags); 1507 tmp = readl(&dev->usb->usbctl); 1508 if (value) { 1509 tmp |= BIT(SELF_POWERED_STATUS); 1510 _gadget->is_selfpowered = 1; 1511 } else { 1512 tmp &= ~BIT(SELF_POWERED_STATUS); 1513 _gadget->is_selfpowered = 0; 1514 } 1515 writel(tmp, &dev->usb->usbctl); 1516 spin_unlock_irqrestore(&dev->lock, flags); 1517 1518 return 0; 1519 } 1520 1521 static int net2280_pullup(struct usb_gadget *_gadget, int is_on) 1522 { 1523 struct net2280 *dev; 1524 u32 tmp; 1525 unsigned long flags; 1526 1527 if (!_gadget) 1528 return -ENODEV; 1529 dev = container_of(_gadget, struct net2280, gadget); 1530 1531 spin_lock_irqsave(&dev->lock, flags); 1532 tmp = readl(&dev->usb->usbctl); 1533 dev->softconnect = (is_on != 0); 1534 if (is_on) { 1535 ep0_start(dev); 1536 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl); 1537 } else { 1538 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl); 1539 stop_activity(dev, NULL); 1540 } 1541 1542 spin_unlock_irqrestore(&dev->lock, flags); 1543 1544 return 0; 1545 } 1546 1547 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget, 1548 struct usb_endpoint_descriptor *desc, 1549 struct usb_ss_ep_comp_descriptor *ep_comp) 1550 { 1551 char name[8]; 1552 struct usb_ep *ep; 1553 1554 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) { 1555 /* ep-e, ep-f are PIO with only 64 byte fifos */ 1556 ep = gadget_find_ep_by_name(_gadget, "ep-e"); 1557 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1558 return ep; 1559 ep = gadget_find_ep_by_name(_gadget, "ep-f"); 1560 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1561 return ep; 1562 } 1563 1564 /* USB3380: Only first four endpoints have DMA channels. Allocate 1565 * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc 1566 * endpoints use DMA hw endpoints. 1567 */ 1568 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT && 1569 usb_endpoint_dir_in(desc)) { 1570 ep = gadget_find_ep_by_name(_gadget, "ep2in"); 1571 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1572 return ep; 1573 ep = gadget_find_ep_by_name(_gadget, "ep4in"); 1574 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1575 return ep; 1576 } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT && 1577 !usb_endpoint_dir_in(desc)) { 1578 ep = gadget_find_ep_by_name(_gadget, "ep1out"); 1579 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1580 return ep; 1581 ep = gadget_find_ep_by_name(_gadget, "ep3out"); 1582 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1583 return ep; 1584 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK && 1585 usb_endpoint_dir_in(desc)) { 1586 ep = gadget_find_ep_by_name(_gadget, "ep1in"); 1587 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1588 return ep; 1589 ep = gadget_find_ep_by_name(_gadget, "ep3in"); 1590 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1591 return ep; 1592 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK && 1593 !usb_endpoint_dir_in(desc)) { 1594 ep = gadget_find_ep_by_name(_gadget, "ep2out"); 1595 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1596 return ep; 1597 ep = gadget_find_ep_by_name(_gadget, "ep4out"); 1598 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1599 return ep; 1600 } 1601 1602 /* USB3380: use same address for usb and hardware endpoints */ 1603 snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc), 1604 usb_endpoint_dir_in(desc) ? "in" : "out"); 1605 ep = gadget_find_ep_by_name(_gadget, name); 1606 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp)) 1607 return ep; 1608 1609 return NULL; 1610 } 1611 1612 static int net2280_start(struct usb_gadget *_gadget, 1613 struct usb_gadget_driver *driver); 1614 static int net2280_stop(struct usb_gadget *_gadget); 1615 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable); 1616 1617 static const struct usb_gadget_ops net2280_ops = { 1618 .get_frame = net2280_get_frame, 1619 .wakeup = net2280_wakeup, 1620 .set_selfpowered = net2280_set_selfpowered, 1621 .pullup = net2280_pullup, 1622 .udc_start = net2280_start, 1623 .udc_stop = net2280_stop, 1624 .udc_async_callbacks = net2280_async_callbacks, 1625 .match_ep = net2280_match_ep, 1626 }; 1627 1628 /*-------------------------------------------------------------------------*/ 1629 1630 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1631 1632 /* FIXME move these into procfs, and use seq_file. 1633 * Sysfs _still_ doesn't behave for arbitrarily sized files, 1634 * and also doesn't help products using this with 2.4 kernels. 1635 */ 1636 1637 /* "function" sysfs attribute */ 1638 static ssize_t function_show(struct device *_dev, struct device_attribute *attr, 1639 char *buf) 1640 { 1641 struct net2280 *dev = dev_get_drvdata(_dev); 1642 1643 if (!dev->driver || !dev->driver->function || 1644 strlen(dev->driver->function) > PAGE_SIZE) 1645 return 0; 1646 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function); 1647 } 1648 static DEVICE_ATTR_RO(function); 1649 1650 static ssize_t registers_show(struct device *_dev, 1651 struct device_attribute *attr, char *buf) 1652 { 1653 struct net2280 *dev; 1654 char *next; 1655 unsigned size, t; 1656 unsigned long flags; 1657 int i; 1658 u32 t1, t2; 1659 const char *s; 1660 1661 dev = dev_get_drvdata(_dev); 1662 next = buf; 1663 size = PAGE_SIZE; 1664 spin_lock_irqsave(&dev->lock, flags); 1665 1666 if (dev->driver) 1667 s = dev->driver->driver.name; 1668 else 1669 s = "(none)"; 1670 1671 /* Main Control Registers */ 1672 t = scnprintf(next, size, "%s version " DRIVER_VERSION 1673 ", chiprev %04x\n\n" 1674 "devinit %03x fifoctl %08x gadget '%s'\n" 1675 "pci irqenb0 %02x irqenb1 %08x " 1676 "irqstat0 %04x irqstat1 %08x\n", 1677 driver_name, dev->chiprev, 1678 readl(&dev->regs->devinit), 1679 readl(&dev->regs->fifoctl), 1680 s, 1681 readl(&dev->regs->pciirqenb0), 1682 readl(&dev->regs->pciirqenb1), 1683 readl(&dev->regs->irqstat0), 1684 readl(&dev->regs->irqstat1)); 1685 size -= t; 1686 next += t; 1687 1688 /* USB Control Registers */ 1689 t1 = readl(&dev->usb->usbctl); 1690 t2 = readl(&dev->usb->usbstat); 1691 if (t1 & BIT(VBUS_PIN)) { 1692 if (t2 & BIT(HIGH_SPEED)) 1693 s = "high speed"; 1694 else if (dev->gadget.speed == USB_SPEED_UNKNOWN) 1695 s = "powered"; 1696 else 1697 s = "full speed"; 1698 /* full speed bit (6) not working?? */ 1699 } else 1700 s = "not attached"; 1701 t = scnprintf(next, size, 1702 "stdrsp %08x usbctl %08x usbstat %08x " 1703 "addr 0x%02x (%s)\n", 1704 readl(&dev->usb->stdrsp), t1, t2, 1705 readl(&dev->usb->ouraddr), s); 1706 size -= t; 1707 next += t; 1708 1709 /* PCI Master Control Registers */ 1710 1711 /* DMA Control Registers */ 1712 1713 /* Configurable EP Control Registers */ 1714 for (i = 0; i < dev->n_ep; i++) { 1715 struct net2280_ep *ep; 1716 1717 ep = &dev->ep[i]; 1718 if (i && !ep->desc) 1719 continue; 1720 1721 t1 = readl(&ep->cfg->ep_cfg); 1722 t2 = readl(&ep->regs->ep_rsp) & 0xff; 1723 t = scnprintf(next, size, 1724 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" 1725 "irqenb %02x\n", 1726 ep->ep.name, t1, t2, 1727 (t2 & BIT(CLEAR_NAK_OUT_PACKETS)) 1728 ? "NAK " : "", 1729 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE)) 1730 ? "hide " : "", 1731 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR)) 1732 ? "CRC " : "", 1733 (t2 & BIT(CLEAR_INTERRUPT_MODE)) 1734 ? "interrupt " : "", 1735 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) 1736 ? "status " : "", 1737 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE)) 1738 ? "NAKmode " : "", 1739 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE)) 1740 ? "DATA1 " : "DATA0 ", 1741 (t2 & BIT(CLEAR_ENDPOINT_HALT)) 1742 ? "HALT " : "", 1743 readl(&ep->regs->ep_irqenb)); 1744 size -= t; 1745 next += t; 1746 1747 t = scnprintf(next, size, 1748 "\tstat %08x avail %04x " 1749 "(ep%d%s-%s)%s\n", 1750 readl(&ep->regs->ep_stat), 1751 readl(&ep->regs->ep_avail), 1752 t1 & 0x0f, DIR_STRING(t1), 1753 type_string(t1 >> 8), 1754 ep->stopped ? "*" : ""); 1755 size -= t; 1756 next += t; 1757 1758 if (!ep->dma) 1759 continue; 1760 1761 t = scnprintf(next, size, 1762 " dma\tctl %08x stat %08x count %08x\n" 1763 "\taddr %08x desc %08x\n", 1764 readl(&ep->dma->dmactl), 1765 readl(&ep->dma->dmastat), 1766 readl(&ep->dma->dmacount), 1767 readl(&ep->dma->dmaaddr), 1768 readl(&ep->dma->dmadesc)); 1769 size -= t; 1770 next += t; 1771 1772 } 1773 1774 /* Indexed Registers (none yet) */ 1775 1776 /* Statistics */ 1777 t = scnprintf(next, size, "\nirqs: "); 1778 size -= t; 1779 next += t; 1780 for (i = 0; i < dev->n_ep; i++) { 1781 struct net2280_ep *ep; 1782 1783 ep = &dev->ep[i]; 1784 if (i && !ep->irqs) 1785 continue; 1786 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs); 1787 size -= t; 1788 next += t; 1789 1790 } 1791 t = scnprintf(next, size, "\n"); 1792 size -= t; 1793 next += t; 1794 1795 spin_unlock_irqrestore(&dev->lock, flags); 1796 1797 return PAGE_SIZE - size; 1798 } 1799 static DEVICE_ATTR_RO(registers); 1800 1801 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr, 1802 char *buf) 1803 { 1804 struct net2280 *dev; 1805 char *next; 1806 unsigned size; 1807 unsigned long flags; 1808 int i; 1809 1810 dev = dev_get_drvdata(_dev); 1811 next = buf; 1812 size = PAGE_SIZE; 1813 spin_lock_irqsave(&dev->lock, flags); 1814 1815 for (i = 0; i < dev->n_ep; i++) { 1816 struct net2280_ep *ep = &dev->ep[i]; 1817 struct net2280_request *req; 1818 int t; 1819 1820 if (i != 0) { 1821 const struct usb_endpoint_descriptor *d; 1822 1823 d = ep->desc; 1824 if (!d) 1825 continue; 1826 t = d->bEndpointAddress; 1827 t = scnprintf(next, size, 1828 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", 1829 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, 1830 (t & USB_DIR_IN) ? "in" : "out", 1831 type_string(d->bmAttributes), 1832 usb_endpoint_maxp(d), 1833 ep->dma ? "dma" : "pio", ep->fifo_size 1834 ); 1835 } else /* ep0 should only have one transfer queued */ 1836 t = scnprintf(next, size, "ep0 max 64 pio %s\n", 1837 ep->is_in ? "in" : "out"); 1838 if (t <= 0 || t > size) 1839 goto done; 1840 size -= t; 1841 next += t; 1842 1843 if (list_empty(&ep->queue)) { 1844 t = scnprintf(next, size, "\t(nothing queued)\n"); 1845 if (t <= 0 || t > size) 1846 goto done; 1847 size -= t; 1848 next += t; 1849 continue; 1850 } 1851 list_for_each_entry(req, &ep->queue, queue) { 1852 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc)) 1853 t = scnprintf(next, size, 1854 "\treq %p len %d/%d " 1855 "buf %p (dmacount %08x)\n", 1856 &req->req, req->req.actual, 1857 req->req.length, req->req.buf, 1858 readl(&ep->dma->dmacount)); 1859 else 1860 t = scnprintf(next, size, 1861 "\treq %p len %d/%d buf %p\n", 1862 &req->req, req->req.actual, 1863 req->req.length, req->req.buf); 1864 if (t <= 0 || t > size) 1865 goto done; 1866 size -= t; 1867 next += t; 1868 1869 if (ep->dma) { 1870 struct net2280_dma *td; 1871 1872 td = req->td; 1873 t = scnprintf(next, size, "\t td %08x " 1874 " count %08x buf %08x desc %08x\n", 1875 (u32) req->td_dma, 1876 le32_to_cpu(td->dmacount), 1877 le32_to_cpu(td->dmaaddr), 1878 le32_to_cpu(td->dmadesc)); 1879 if (t <= 0 || t > size) 1880 goto done; 1881 size -= t; 1882 next += t; 1883 } 1884 } 1885 } 1886 1887 done: 1888 spin_unlock_irqrestore(&dev->lock, flags); 1889 return PAGE_SIZE - size; 1890 } 1891 static DEVICE_ATTR_RO(queues); 1892 1893 1894 #else 1895 1896 #define device_create_file(a, b) (0) 1897 #define device_remove_file(a, b) do { } while (0) 1898 1899 #endif 1900 1901 /*-------------------------------------------------------------------------*/ 1902 1903 /* another driver-specific mode might be a request type doing dma 1904 * to/from another device fifo instead of to/from memory. 1905 */ 1906 1907 static void set_fifo_mode(struct net2280 *dev, int mode) 1908 { 1909 /* keeping high bits preserves BAR2 */ 1910 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); 1911 1912 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ 1913 INIT_LIST_HEAD(&dev->gadget.ep_list); 1914 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list); 1915 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list); 1916 switch (mode) { 1917 case 0: 1918 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list); 1919 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list); 1920 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024; 1921 break; 1922 case 1: 1923 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048; 1924 break; 1925 case 2: 1926 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list); 1927 dev->ep[1].fifo_size = 2048; 1928 dev->ep[2].fifo_size = 1024; 1929 break; 1930 } 1931 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ 1932 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list); 1933 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list); 1934 } 1935 1936 static void defect7374_disable_data_eps(struct net2280 *dev) 1937 { 1938 /* 1939 * For Defect 7374, disable data EPs (and more): 1940 * - This phase undoes the earlier phase of the Defect 7374 workaround, 1941 * returing ep regs back to normal. 1942 */ 1943 struct net2280_ep *ep; 1944 int i; 1945 unsigned char ep_sel; 1946 u32 tmp_reg; 1947 1948 for (i = 1; i < 5; i++) { 1949 ep = &dev->ep[i]; 1950 writel(i, &ep->cfg->ep_cfg); 1951 } 1952 1953 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */ 1954 for (i = 0; i < 6; i++) 1955 writel(0, &dev->dep[i].dep_cfg); 1956 1957 for (ep_sel = 0; ep_sel <= 21; ep_sel++) { 1958 /* Select an endpoint for subsequent operations: */ 1959 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 1960 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl); 1961 1962 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) || 1963 ep_sel == 18 || ep_sel == 20) 1964 continue; 1965 1966 /* Change settings on some selected endpoints */ 1967 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4); 1968 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR); 1969 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4); 1970 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 1971 tmp_reg |= BIT(EP_INITIALIZED); 1972 writel(tmp_reg, &dev->plregs->pl_ep_ctrl); 1973 } 1974 } 1975 1976 static void defect7374_enable_data_eps_zero(struct net2280 *dev) 1977 { 1978 u32 tmp = 0, tmp_reg; 1979 u32 scratch; 1980 int i; 1981 unsigned char ep_sel; 1982 1983 scratch = get_idx_reg(dev->regs, SCRATCH); 1984 1985 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD)) 1986 == DEFECT7374_FSM_SS_CONTROL_READ); 1987 1988 scratch &= ~(0xf << DEFECT7374_FSM_FIELD); 1989 1990 ep_warn(dev, "Operate Defect 7374 workaround soft this time"); 1991 ep_warn(dev, "It will operate on cold-reboot and SS connect"); 1992 1993 /*GPEPs:*/ 1994 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) | 1995 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) | 1996 ((dev->enhanced_mode) ? 1997 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) : 1998 BIT(ENDPOINT_ENABLE))); 1999 2000 for (i = 1; i < 5; i++) 2001 writel(tmp, &dev->ep[i].cfg->ep_cfg); 2002 2003 /* CSRIN, PCIIN, STATIN, RCIN*/ 2004 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE)); 2005 writel(tmp, &dev->dep[1].dep_cfg); 2006 writel(tmp, &dev->dep[3].dep_cfg); 2007 writel(tmp, &dev->dep[4].dep_cfg); 2008 writel(tmp, &dev->dep[5].dep_cfg); 2009 2010 /*Implemented for development and debug. 2011 * Can be refined/tuned later.*/ 2012 for (ep_sel = 0; ep_sel <= 21; ep_sel++) { 2013 /* Select an endpoint for subsequent operations: */ 2014 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 2015 writel(((tmp_reg & ~0x1f) | ep_sel), 2016 &dev->plregs->pl_ep_ctrl); 2017 2018 if (ep_sel == 1) { 2019 tmp = 2020 (readl(&dev->plregs->pl_ep_ctrl) | 2021 BIT(CLEAR_ACK_ERROR_CODE) | 0); 2022 writel(tmp, &dev->plregs->pl_ep_ctrl); 2023 continue; 2024 } 2025 2026 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) || 2027 ep_sel == 18 || ep_sel == 20) 2028 continue; 2029 2030 tmp = (readl(&dev->plregs->pl_ep_cfg_4) | 2031 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0); 2032 writel(tmp, &dev->plregs->pl_ep_cfg_4); 2033 2034 tmp = readl(&dev->plregs->pl_ep_ctrl) & 2035 ~BIT(EP_INITIALIZED); 2036 writel(tmp, &dev->plregs->pl_ep_ctrl); 2037 2038 } 2039 2040 /* Set FSM to focus on the first Control Read: 2041 * - Tip: Connection speed is known upon the first 2042 * setup request.*/ 2043 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ; 2044 set_idx_reg(dev->regs, SCRATCH, scratch); 2045 2046 } 2047 2048 /* keeping it simple: 2049 * - one bus driver, initted first; 2050 * - one function driver, initted second 2051 * 2052 * most of the work to support multiple net2280 controllers would 2053 * be to associate this gadget driver (yes?) with all of them, or 2054 * perhaps to bind specific drivers to specific devices. 2055 */ 2056 2057 static void usb_reset_228x(struct net2280 *dev) 2058 { 2059 u32 tmp; 2060 2061 dev->gadget.speed = USB_SPEED_UNKNOWN; 2062 (void) readl(&dev->usb->usbctl); 2063 2064 net2280_led_init(dev); 2065 2066 /* disable automatic responses, and irqs */ 2067 writel(0, &dev->usb->stdrsp); 2068 writel(0, &dev->regs->pciirqenb0); 2069 writel(0, &dev->regs->pciirqenb1); 2070 2071 /* clear old dma and irq state */ 2072 for (tmp = 0; tmp < 4; tmp++) { 2073 struct net2280_ep *ep = &dev->ep[tmp + 1]; 2074 if (ep->dma) 2075 abort_dma(ep); 2076 } 2077 2078 writel(~0, &dev->regs->irqstat0), 2079 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), 2080 2081 /* reset, and enable pci */ 2082 tmp = readl(&dev->regs->devinit) | 2083 BIT(PCI_ENABLE) | 2084 BIT(FIFO_SOFT_RESET) | 2085 BIT(USB_SOFT_RESET) | 2086 BIT(M8051_RESET); 2087 writel(tmp, &dev->regs->devinit); 2088 2089 /* standard fifo and endpoint allocations */ 2090 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0); 2091 } 2092 2093 static void usb_reset_338x(struct net2280 *dev) 2094 { 2095 u32 tmp; 2096 2097 dev->gadget.speed = USB_SPEED_UNKNOWN; 2098 (void)readl(&dev->usb->usbctl); 2099 2100 net2280_led_init(dev); 2101 2102 if (dev->bug7734_patched) { 2103 /* disable automatic responses, and irqs */ 2104 writel(0, &dev->usb->stdrsp); 2105 writel(0, &dev->regs->pciirqenb0); 2106 writel(0, &dev->regs->pciirqenb1); 2107 } 2108 2109 /* clear old dma and irq state */ 2110 for (tmp = 0; tmp < 4; tmp++) { 2111 struct net2280_ep *ep = &dev->ep[tmp + 1]; 2112 struct net2280_dma_regs __iomem *dma; 2113 2114 if (ep->dma) { 2115 abort_dma(ep); 2116 } else { 2117 dma = &dev->dma[tmp]; 2118 writel(BIT(DMA_ABORT), &dma->dmastat); 2119 writel(0, &dma->dmactl); 2120 } 2121 } 2122 2123 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1); 2124 2125 if (dev->bug7734_patched) { 2126 /* reset, and enable pci */ 2127 tmp = readl(&dev->regs->devinit) | 2128 BIT(PCI_ENABLE) | 2129 BIT(FIFO_SOFT_RESET) | 2130 BIT(USB_SOFT_RESET) | 2131 BIT(M8051_RESET); 2132 2133 writel(tmp, &dev->regs->devinit); 2134 } 2135 2136 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */ 2137 INIT_LIST_HEAD(&dev->gadget.ep_list); 2138 2139 for (tmp = 1; tmp < dev->n_ep; tmp++) 2140 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list); 2141 2142 } 2143 2144 static void usb_reset(struct net2280 *dev) 2145 { 2146 if (dev->quirks & PLX_LEGACY) 2147 return usb_reset_228x(dev); 2148 return usb_reset_338x(dev); 2149 } 2150 2151 static void usb_reinit_228x(struct net2280 *dev) 2152 { 2153 u32 tmp; 2154 2155 /* basic endpoint init */ 2156 for (tmp = 0; tmp < 7; tmp++) { 2157 struct net2280_ep *ep = &dev->ep[tmp]; 2158 2159 ep->ep.name = ep_info_dft[tmp].name; 2160 ep->ep.caps = ep_info_dft[tmp].caps; 2161 ep->dev = dev; 2162 ep->num = tmp; 2163 2164 if (tmp > 0 && tmp <= 4) { 2165 ep->fifo_size = 1024; 2166 ep->dma = &dev->dma[tmp - 1]; 2167 } else 2168 ep->fifo_size = 64; 2169 ep->regs = &dev->epregs[tmp]; 2170 ep->cfg = &dev->epregs[tmp]; 2171 ep_reset_228x(dev->regs, ep); 2172 } 2173 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64); 2174 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64); 2175 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64); 2176 2177 dev->gadget.ep0 = &dev->ep[0].ep; 2178 dev->ep[0].stopped = 0; 2179 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); 2180 2181 /* we want to prevent lowlevel/insecure access from the USB host, 2182 * but erratum 0119 means this enable bit is ignored 2183 */ 2184 for (tmp = 0; tmp < 5; tmp++) 2185 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg); 2186 } 2187 2188 static void usb_reinit_338x(struct net2280 *dev) 2189 { 2190 int i; 2191 u32 tmp, val; 2192 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 }; 2193 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00, 2194 0x00, 0xC0, 0x00, 0xC0 }; 2195 2196 /* basic endpoint init */ 2197 for (i = 0; i < dev->n_ep; i++) { 2198 struct net2280_ep *ep = &dev->ep[i]; 2199 2200 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name : 2201 ep_info_dft[i].name; 2202 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps : 2203 ep_info_dft[i].caps; 2204 ep->dev = dev; 2205 ep->num = i; 2206 2207 if (i > 0 && i <= 4) 2208 ep->dma = &dev->dma[i - 1]; 2209 2210 if (dev->enhanced_mode) { 2211 ep->cfg = &dev->epregs[ne[i]]; 2212 /* 2213 * Set USB endpoint number, hardware allows same number 2214 * in both directions. 2215 */ 2216 if (i > 0 && i < 5) 2217 writel(ne[i], &ep->cfg->ep_cfg); 2218 ep->regs = (struct net2280_ep_regs __iomem *) 2219 (((void __iomem *)&dev->epregs[ne[i]]) + 2220 ep_reg_addr[i]); 2221 } else { 2222 ep->cfg = &dev->epregs[i]; 2223 ep->regs = &dev->epregs[i]; 2224 } 2225 2226 ep->fifo_size = (i != 0) ? 2048 : 512; 2227 2228 ep_reset_338x(dev->regs, ep); 2229 } 2230 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512); 2231 2232 dev->gadget.ep0 = &dev->ep[0].ep; 2233 dev->ep[0].stopped = 0; 2234 2235 /* Link layer set up */ 2236 if (dev->bug7734_patched) { 2237 tmp = readl(&dev->usb_ext->usbctl2) & 2238 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE)); 2239 writel(tmp, &dev->usb_ext->usbctl2); 2240 } 2241 2242 /* Hardware Defect and Workaround */ 2243 val = readl(&dev->llregs->ll_lfps_5); 2244 val &= ~(0xf << TIMER_LFPS_6US); 2245 val |= 0x5 << TIMER_LFPS_6US; 2246 writel(val, &dev->llregs->ll_lfps_5); 2247 2248 val = readl(&dev->llregs->ll_lfps_6); 2249 val &= ~(0xffff << TIMER_LFPS_80US); 2250 val |= 0x0100 << TIMER_LFPS_80US; 2251 writel(val, &dev->llregs->ll_lfps_6); 2252 2253 /* 2254 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB 2255 * Hot Reset Exit Handshake may Fail in Specific Case using 2256 * Default Register Settings. Workaround for Enumeration test. 2257 */ 2258 val = readl(&dev->llregs->ll_tsn_counters_2); 2259 val &= ~(0x1f << HOT_TX_NORESET_TS2); 2260 val |= 0x10 << HOT_TX_NORESET_TS2; 2261 writel(val, &dev->llregs->ll_tsn_counters_2); 2262 2263 val = readl(&dev->llregs->ll_tsn_counters_3); 2264 val &= ~(0x1f << HOT_RX_RESET_TS2); 2265 val |= 0x3 << HOT_RX_RESET_TS2; 2266 writel(val, &dev->llregs->ll_tsn_counters_3); 2267 2268 /* 2269 * AB errata. Errata 11. Workaround for Default Duration of LFPS 2270 * Handshake Signaling for Device-Initiated U1 Exit is too short. 2271 * Without this, various enumeration failures observed with 2272 * modern superspeed hosts. 2273 */ 2274 val = readl(&dev->llregs->ll_lfps_timers_2); 2275 writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE, 2276 &dev->llregs->ll_lfps_timers_2); 2277 2278 /* 2279 * Set Recovery Idle to Recover bit: 2280 * - On SS connections, setting Recovery Idle to Recover Fmw improves 2281 * link robustness with various hosts and hubs. 2282 * - It is safe to set for all connection speeds; all chip revisions. 2283 * - R-M-W to leave other bits undisturbed. 2284 * - Reference PLX TT-7372 2285 */ 2286 val = readl(&dev->llregs->ll_tsn_chicken_bit); 2287 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW); 2288 writel(val, &dev->llregs->ll_tsn_chicken_bit); 2289 2290 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); 2291 2292 /* disable dedicated endpoints */ 2293 writel(0x0D, &dev->dep[0].dep_cfg); 2294 writel(0x0D, &dev->dep[1].dep_cfg); 2295 writel(0x0E, &dev->dep[2].dep_cfg); 2296 writel(0x0E, &dev->dep[3].dep_cfg); 2297 writel(0x0F, &dev->dep[4].dep_cfg); 2298 writel(0x0C, &dev->dep[5].dep_cfg); 2299 } 2300 2301 static void usb_reinit(struct net2280 *dev) 2302 { 2303 if (dev->quirks & PLX_LEGACY) 2304 return usb_reinit_228x(dev); 2305 return usb_reinit_338x(dev); 2306 } 2307 2308 static void ep0_start_228x(struct net2280 *dev) 2309 { 2310 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) | 2311 BIT(CLEAR_NAK_OUT_PACKETS) | 2312 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), 2313 &dev->epregs[0].ep_rsp); 2314 2315 /* 2316 * hardware optionally handles a bunch of standard requests 2317 * that the API hides from drivers anyway. have it do so. 2318 * endpoint status/features are handled in software, to 2319 * help pass tests for some dubious behavior. 2320 */ 2321 writel(BIT(SET_TEST_MODE) | 2322 BIT(SET_ADDRESS) | 2323 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | 2324 BIT(GET_DEVICE_STATUS) | 2325 BIT(GET_INTERFACE_STATUS), 2326 &dev->usb->stdrsp); 2327 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) | 2328 BIT(SELF_POWERED_USB_DEVICE) | 2329 BIT(REMOTE_WAKEUP_SUPPORT) | 2330 (dev->softconnect << USB_DETECT_ENABLE) | 2331 BIT(SELF_POWERED_STATUS), 2332 &dev->usb->usbctl); 2333 2334 /* enable irqs so we can see ep0 and general operation */ 2335 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) | 2336 BIT(ENDPOINT_0_INTERRUPT_ENABLE), 2337 &dev->regs->pciirqenb0); 2338 writel(BIT(PCI_INTERRUPT_ENABLE) | 2339 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | 2340 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | 2341 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) | 2342 BIT(VBUS_INTERRUPT_ENABLE) | 2343 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) | 2344 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE), 2345 &dev->regs->pciirqenb1); 2346 2347 /* don't leave any writes posted */ 2348 (void) readl(&dev->usb->usbctl); 2349 } 2350 2351 static void ep0_start_338x(struct net2280 *dev) 2352 { 2353 2354 if (dev->bug7734_patched) 2355 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) | 2356 BIT(SET_EP_HIDE_STATUS_PHASE), 2357 &dev->epregs[0].ep_rsp); 2358 2359 /* 2360 * hardware optionally handles a bunch of standard requests 2361 * that the API hides from drivers anyway. have it do so. 2362 * endpoint status/features are handled in software, to 2363 * help pass tests for some dubious behavior. 2364 */ 2365 writel(BIT(SET_ISOCHRONOUS_DELAY) | 2366 BIT(SET_SEL) | 2367 BIT(SET_TEST_MODE) | 2368 BIT(SET_ADDRESS) | 2369 BIT(GET_INTERFACE_STATUS) | 2370 BIT(GET_DEVICE_STATUS), 2371 &dev->usb->stdrsp); 2372 dev->wakeup_enable = 1; 2373 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) | 2374 (dev->softconnect << USB_DETECT_ENABLE) | 2375 BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 2376 &dev->usb->usbctl); 2377 2378 /* enable irqs so we can see ep0 and general operation */ 2379 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) | 2380 BIT(ENDPOINT_0_INTERRUPT_ENABLE), 2381 &dev->regs->pciirqenb0); 2382 writel(BIT(PCI_INTERRUPT_ENABLE) | 2383 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) | 2384 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) | 2385 BIT(VBUS_INTERRUPT_ENABLE), 2386 &dev->regs->pciirqenb1); 2387 2388 /* don't leave any writes posted */ 2389 (void)readl(&dev->usb->usbctl); 2390 } 2391 2392 static void ep0_start(struct net2280 *dev) 2393 { 2394 if (dev->quirks & PLX_LEGACY) 2395 return ep0_start_228x(dev); 2396 return ep0_start_338x(dev); 2397 } 2398 2399 /* when a driver is successfully registered, it will receive 2400 * control requests including set_configuration(), which enables 2401 * non-control requests. then usb traffic follows until a 2402 * disconnect is reported. then a host may connect again, or 2403 * the driver might get unbound. 2404 */ 2405 static int net2280_start(struct usb_gadget *_gadget, 2406 struct usb_gadget_driver *driver) 2407 { 2408 struct net2280 *dev; 2409 int retval; 2410 unsigned i; 2411 2412 /* insist on high speed support from the driver, since 2413 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) 2414 * "must not be used in normal operation" 2415 */ 2416 if (!driver || driver->max_speed < USB_SPEED_HIGH || 2417 !driver->setup) 2418 return -EINVAL; 2419 2420 dev = container_of(_gadget, struct net2280, gadget); 2421 2422 for (i = 0; i < dev->n_ep; i++) 2423 dev->ep[i].irqs = 0; 2424 2425 /* hook up the driver ... */ 2426 driver->driver.bus = NULL; 2427 dev->driver = driver; 2428 2429 retval = device_create_file(&dev->pdev->dev, &dev_attr_function); 2430 if (retval) 2431 goto err_unbind; 2432 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues); 2433 if (retval) 2434 goto err_func; 2435 2436 /* enable host detection and ep0; and we're ready 2437 * for set_configuration as well as eventual disconnect. 2438 */ 2439 net2280_led_active(dev, 1); 2440 2441 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched) 2442 defect7374_enable_data_eps_zero(dev); 2443 2444 ep0_start(dev); 2445 2446 /* pci writes may still be posted */ 2447 return 0; 2448 2449 err_func: 2450 device_remove_file(&dev->pdev->dev, &dev_attr_function); 2451 err_unbind: 2452 dev->driver = NULL; 2453 return retval; 2454 } 2455 2456 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver) 2457 { 2458 int i; 2459 2460 /* don't disconnect if it's not connected */ 2461 if (dev->gadget.speed == USB_SPEED_UNKNOWN) 2462 driver = NULL; 2463 2464 /* stop hardware; prevent new request submissions; 2465 * and kill any outstanding requests. 2466 */ 2467 usb_reset(dev); 2468 for (i = 0; i < dev->n_ep; i++) 2469 nuke(&dev->ep[i]); 2470 2471 /* report disconnect; the driver is already quiesced */ 2472 if (dev->async_callbacks && driver) { 2473 spin_unlock(&dev->lock); 2474 driver->disconnect(&dev->gadget); 2475 spin_lock(&dev->lock); 2476 } 2477 2478 usb_reinit(dev); 2479 } 2480 2481 static int net2280_stop(struct usb_gadget *_gadget) 2482 { 2483 struct net2280 *dev; 2484 unsigned long flags; 2485 2486 dev = container_of(_gadget, struct net2280, gadget); 2487 2488 spin_lock_irqsave(&dev->lock, flags); 2489 stop_activity(dev, NULL); 2490 spin_unlock_irqrestore(&dev->lock, flags); 2491 2492 net2280_led_active(dev, 0); 2493 2494 device_remove_file(&dev->pdev->dev, &dev_attr_function); 2495 device_remove_file(&dev->pdev->dev, &dev_attr_queues); 2496 2497 dev->driver = NULL; 2498 2499 return 0; 2500 } 2501 2502 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable) 2503 { 2504 struct net2280 *dev = container_of(_gadget, struct net2280, gadget); 2505 2506 spin_lock_irq(&dev->lock); 2507 dev->async_callbacks = enable; 2508 spin_unlock_irq(&dev->lock); 2509 } 2510 2511 /*-------------------------------------------------------------------------*/ 2512 2513 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. 2514 * also works for dma-capable endpoints, in pio mode or just 2515 * to manually advance the queue after short OUT transfers. 2516 */ 2517 static void handle_ep_small(struct net2280_ep *ep) 2518 { 2519 struct net2280_request *req; 2520 u32 t; 2521 /* 0 error, 1 mid-data, 2 done */ 2522 int mode = 1; 2523 2524 if (!list_empty(&ep->queue)) 2525 req = list_entry(ep->queue.next, 2526 struct net2280_request, queue); 2527 else 2528 req = NULL; 2529 2530 /* ack all, and handle what we care about */ 2531 t = readl(&ep->regs->ep_stat); 2532 ep->irqs++; 2533 2534 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n", 2535 ep->ep.name, t, req ? &req->req : NULL); 2536 2537 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) 2538 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat); 2539 else 2540 /* Added for 2282 */ 2541 writel(t, &ep->regs->ep_stat); 2542 2543 /* for ep0, monitor token irqs to catch data stage length errors 2544 * and to synchronize on status. 2545 * 2546 * also, to defer reporting of protocol stalls ... here's where 2547 * data or status first appears, handling stalls here should never 2548 * cause trouble on the host side.. 2549 * 2550 * control requests could be slightly faster without token synch for 2551 * status, but status can jam up that way. 2552 */ 2553 if (unlikely(ep->num == 0)) { 2554 if (ep->is_in) { 2555 /* status; stop NAKing */ 2556 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) { 2557 if (ep->dev->protocol_stall) { 2558 ep->stopped = 1; 2559 set_halt(ep); 2560 } 2561 if (!req) 2562 allow_status(ep); 2563 mode = 2; 2564 /* reply to extra IN data tokens with a zlp */ 2565 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) { 2566 if (ep->dev->protocol_stall) { 2567 ep->stopped = 1; 2568 set_halt(ep); 2569 mode = 2; 2570 } else if (ep->responded && 2571 !req && !ep->stopped) 2572 write_fifo(ep, NULL); 2573 } 2574 } else { 2575 /* status; stop NAKing */ 2576 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) { 2577 if (ep->dev->protocol_stall) { 2578 ep->stopped = 1; 2579 set_halt(ep); 2580 } 2581 mode = 2; 2582 /* an extra OUT token is an error */ 2583 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) && 2584 req && 2585 req->req.actual == req->req.length) || 2586 (ep->responded && !req)) { 2587 ep->dev->protocol_stall = 1; 2588 set_halt(ep); 2589 ep->stopped = 1; 2590 if (req) 2591 done(ep, req, -EOVERFLOW); 2592 req = NULL; 2593 } 2594 } 2595 } 2596 2597 if (unlikely(!req)) 2598 return; 2599 2600 /* manual DMA queue advance after short OUT */ 2601 if (likely(ep->dma)) { 2602 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) { 2603 struct net2280_request *stuck_req = NULL; 2604 int stopped = ep->stopped; 2605 int num_completed; 2606 int stuck = 0; 2607 u32 count; 2608 2609 /* TRANSFERRED works around OUT_DONE erratum 0112. 2610 * we expect (N <= maxpacket) bytes; host wrote M. 2611 * iff (M < N) we won't ever see a DMA interrupt. 2612 */ 2613 ep->stopped = 1; 2614 for (count = 0; ; t = readl(&ep->regs->ep_stat)) { 2615 2616 /* any preceding dma transfers must finish. 2617 * dma handles (M >= N), may empty the queue 2618 */ 2619 num_completed = scan_dma_completions(ep); 2620 if (unlikely(list_empty(&ep->queue) || 2621 ep->out_overflow)) { 2622 req = NULL; 2623 break; 2624 } 2625 req = list_entry(ep->queue.next, 2626 struct net2280_request, queue); 2627 2628 /* here either (M < N), a "real" short rx; 2629 * or (M == N) and the queue didn't empty 2630 */ 2631 if (likely(t & BIT(FIFO_EMPTY))) { 2632 count = readl(&ep->dma->dmacount); 2633 count &= DMA_BYTE_COUNT_MASK; 2634 if (readl(&ep->dma->dmadesc) 2635 != req->td_dma) 2636 req = NULL; 2637 break; 2638 } 2639 2640 /* Escape loop if no dma transfers completed 2641 * after few retries. 2642 */ 2643 if (num_completed == 0) { 2644 if (stuck_req == req && 2645 readl(&ep->dma->dmadesc) != 2646 req->td_dma && stuck++ > 5) { 2647 count = readl( 2648 &ep->dma->dmacount); 2649 count &= DMA_BYTE_COUNT_MASK; 2650 req = NULL; 2651 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n", 2652 ep->ep.name, stuck, 2653 count); 2654 break; 2655 } else if (stuck_req != req) { 2656 stuck_req = req; 2657 stuck = 0; 2658 } 2659 } else { 2660 stuck_req = NULL; 2661 stuck = 0; 2662 } 2663 2664 udelay(1); 2665 } 2666 2667 /* stop DMA, leave ep NAKing */ 2668 writel(BIT(DMA_ABORT), &ep->dma->dmastat); 2669 spin_stop_dma(ep->dma); 2670 2671 if (likely(req)) { 2672 req->td->dmacount = 0; 2673 t = readl(&ep->regs->ep_avail); 2674 dma_done(ep, req, count, 2675 (ep->out_overflow || t) 2676 ? -EOVERFLOW : 0); 2677 } 2678 2679 /* also flush to prevent erratum 0106 trouble */ 2680 if (unlikely(ep->out_overflow || 2681 (ep->dev->chiprev == 0x0100 && 2682 ep->dev->gadget.speed 2683 == USB_SPEED_FULL))) { 2684 out_flush(ep); 2685 ep->out_overflow = 0; 2686 } 2687 2688 /* (re)start dma if needed, stop NAKing */ 2689 ep->stopped = stopped; 2690 if (!list_empty(&ep->queue)) 2691 restart_dma(ep); 2692 } else 2693 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n", 2694 ep->ep.name, t); 2695 return; 2696 2697 /* data packet(s) received (in the fifo, OUT) */ 2698 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) { 2699 if (read_fifo(ep, req) && ep->num != 0) 2700 mode = 2; 2701 2702 /* data packet(s) transmitted (IN) */ 2703 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) { 2704 unsigned len; 2705 2706 len = req->req.length - req->req.actual; 2707 if (len > ep->ep.maxpacket) 2708 len = ep->ep.maxpacket; 2709 req->req.actual += len; 2710 2711 /* if we wrote it all, we're usually done */ 2712 /* send zlps until the status stage */ 2713 if ((req->req.actual == req->req.length) && 2714 (!req->req.zero || len != ep->ep.maxpacket) && ep->num) 2715 mode = 2; 2716 2717 /* there was nothing to do ... */ 2718 } else if (mode == 1) 2719 return; 2720 2721 /* done */ 2722 if (mode == 2) { 2723 /* stream endpoints often resubmit/unlink in completion */ 2724 done(ep, req, 0); 2725 2726 /* maybe advance queue to next request */ 2727 if (ep->num == 0) { 2728 /* NOTE: net2280 could let gadget driver start the 2729 * status stage later. since not all controllers let 2730 * them control that, the api doesn't (yet) allow it. 2731 */ 2732 if (!ep->stopped) 2733 allow_status(ep); 2734 req = NULL; 2735 } else { 2736 if (!list_empty(&ep->queue) && !ep->stopped) 2737 req = list_entry(ep->queue.next, 2738 struct net2280_request, queue); 2739 else 2740 req = NULL; 2741 if (req && !ep->is_in) 2742 stop_out_naking(ep); 2743 } 2744 } 2745 2746 /* is there a buffer for the next packet? 2747 * for best streaming performance, make sure there is one. 2748 */ 2749 if (req && !ep->stopped) { 2750 2751 /* load IN fifo with next packet (may be zlp) */ 2752 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) 2753 write_fifo(ep, &req->req); 2754 } 2755 } 2756 2757 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex) 2758 { 2759 struct net2280_ep *ep; 2760 2761 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) 2762 return &dev->ep[0]; 2763 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) { 2764 u8 bEndpointAddress; 2765 2766 if (!ep->desc) 2767 continue; 2768 bEndpointAddress = ep->desc->bEndpointAddress; 2769 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) 2770 continue; 2771 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) 2772 return ep; 2773 } 2774 return NULL; 2775 } 2776 2777 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r) 2778 { 2779 u32 scratch, fsmvalue; 2780 u32 ack_wait_timeout, state; 2781 2782 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */ 2783 scratch = get_idx_reg(dev->regs, SCRATCH); 2784 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD); 2785 scratch &= ~(0xf << DEFECT7374_FSM_FIELD); 2786 2787 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) && 2788 (r.bRequestType & USB_DIR_IN))) 2789 return; 2790 2791 /* This is the first Control Read for this connection: */ 2792 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) { 2793 /* 2794 * Connection is NOT SS: 2795 * - Connection must be FS or HS. 2796 * - This FSM state should allow workaround software to 2797 * run after the next USB connection. 2798 */ 2799 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ; 2800 dev->bug7734_patched = 1; 2801 goto restore_data_eps; 2802 } 2803 2804 /* Connection is SS: */ 2805 for (ack_wait_timeout = 0; 2806 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS; 2807 ack_wait_timeout++) { 2808 2809 state = readl(&dev->plregs->pl_ep_status_1) 2810 & (0xff << STATE); 2811 if ((state >= (ACK_GOOD_NORMAL << STATE)) && 2812 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) { 2813 scratch |= DEFECT7374_FSM_SS_CONTROL_READ; 2814 dev->bug7734_patched = 1; 2815 break; 2816 } 2817 2818 /* 2819 * We have not yet received host's Data Phase ACK 2820 * - Wait and try again. 2821 */ 2822 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME); 2823 } 2824 2825 2826 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) { 2827 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed " 2828 "to detect SS host's data phase ACK."); 2829 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16" 2830 "got 0x%2.2x.\n", state >> STATE); 2831 } else { 2832 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n" 2833 "%duSec for Control Read Data Phase ACK\n", 2834 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout); 2835 } 2836 2837 restore_data_eps: 2838 /* 2839 * Restore data EPs to their pre-workaround settings (disabled, 2840 * initialized, and other details). 2841 */ 2842 defect7374_disable_data_eps(dev); 2843 2844 set_idx_reg(dev->regs, SCRATCH, scratch); 2845 2846 return; 2847 } 2848 2849 static void ep_clear_seqnum(struct net2280_ep *ep) 2850 { 2851 struct net2280 *dev = ep->dev; 2852 u32 val; 2853 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 }; 2854 2855 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f; 2856 val |= ep_pl[ep->num]; 2857 writel(val, &dev->plregs->pl_ep_ctrl); 2858 val |= BIT(SEQUENCE_NUMBER_RESET); 2859 writel(val, &dev->plregs->pl_ep_ctrl); 2860 2861 return; 2862 } 2863 2864 static void handle_stat0_irqs_superspeed(struct net2280 *dev, 2865 struct net2280_ep *ep, struct usb_ctrlrequest r) 2866 { 2867 struct net2280_ep *e; 2868 u16 status; 2869 int tmp = 0; 2870 2871 #define w_value le16_to_cpu(r.wValue) 2872 #define w_index le16_to_cpu(r.wIndex) 2873 #define w_length le16_to_cpu(r.wLength) 2874 2875 switch (r.bRequest) { 2876 case USB_REQ_SET_CONFIGURATION: 2877 dev->addressed_state = !w_value; 2878 goto usb3_delegate; 2879 2880 case USB_REQ_GET_STATUS: 2881 switch (r.bRequestType) { 2882 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2883 status = dev->wakeup_enable ? 0x02 : 0x00; 2884 if (dev->gadget.is_selfpowered) 2885 status |= BIT(0); 2886 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 | 2887 dev->ltm_enable << 4); 2888 writel(0, &dev->epregs[0].ep_irqenb); 2889 set_fifo_bytecount(ep, sizeof(status)); 2890 writel((__force u32) status, &dev->epregs[0].ep_data); 2891 allow_status_338x(ep); 2892 break; 2893 2894 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 2895 e = get_ep_by_addr(dev, w_index); 2896 if (!e) 2897 goto do_stall3; 2898 status = readl(&e->regs->ep_rsp) & 2899 BIT(CLEAR_ENDPOINT_HALT); 2900 writel(0, &dev->epregs[0].ep_irqenb); 2901 set_fifo_bytecount(ep, sizeof(status)); 2902 writel((__force u32) status, &dev->epregs[0].ep_data); 2903 allow_status_338x(ep); 2904 break; 2905 2906 default: 2907 goto usb3_delegate; 2908 } 2909 break; 2910 2911 case USB_REQ_CLEAR_FEATURE: 2912 switch (r.bRequestType) { 2913 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2914 if (!dev->addressed_state) { 2915 switch (w_value) { 2916 case USB_DEVICE_U1_ENABLE: 2917 dev->u1_enable = 0; 2918 writel(readl(&dev->usb_ext->usbctl2) & 2919 ~BIT(U1_ENABLE), 2920 &dev->usb_ext->usbctl2); 2921 allow_status_338x(ep); 2922 goto next_endpoints3; 2923 2924 case USB_DEVICE_U2_ENABLE: 2925 dev->u2_enable = 0; 2926 writel(readl(&dev->usb_ext->usbctl2) & 2927 ~BIT(U2_ENABLE), 2928 &dev->usb_ext->usbctl2); 2929 allow_status_338x(ep); 2930 goto next_endpoints3; 2931 2932 case USB_DEVICE_LTM_ENABLE: 2933 dev->ltm_enable = 0; 2934 writel(readl(&dev->usb_ext->usbctl2) & 2935 ~BIT(LTM_ENABLE), 2936 &dev->usb_ext->usbctl2); 2937 allow_status_338x(ep); 2938 goto next_endpoints3; 2939 2940 default: 2941 break; 2942 } 2943 } 2944 if (w_value == USB_DEVICE_REMOTE_WAKEUP) { 2945 dev->wakeup_enable = 0; 2946 writel(readl(&dev->usb->usbctl) & 2947 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 2948 &dev->usb->usbctl); 2949 allow_status_338x(ep); 2950 break; 2951 } 2952 goto usb3_delegate; 2953 2954 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 2955 e = get_ep_by_addr(dev, w_index); 2956 if (!e) 2957 goto do_stall3; 2958 if (w_value != USB_ENDPOINT_HALT) 2959 goto do_stall3; 2960 ep_vdbg(dev, "%s clear halt\n", e->ep.name); 2961 /* 2962 * Workaround for SS SeqNum not cleared via 2963 * Endpoint Halt (Clear) bit. select endpoint 2964 */ 2965 ep_clear_seqnum(e); 2966 clear_halt(e); 2967 if (!list_empty(&e->queue) && e->td_dma) 2968 restart_dma(e); 2969 allow_status(ep); 2970 ep->stopped = 1; 2971 break; 2972 2973 default: 2974 goto usb3_delegate; 2975 } 2976 break; 2977 case USB_REQ_SET_FEATURE: 2978 switch (r.bRequestType) { 2979 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2980 if (!dev->addressed_state) { 2981 switch (w_value) { 2982 case USB_DEVICE_U1_ENABLE: 2983 dev->u1_enable = 1; 2984 writel(readl(&dev->usb_ext->usbctl2) | 2985 BIT(U1_ENABLE), 2986 &dev->usb_ext->usbctl2); 2987 allow_status_338x(ep); 2988 goto next_endpoints3; 2989 2990 case USB_DEVICE_U2_ENABLE: 2991 dev->u2_enable = 1; 2992 writel(readl(&dev->usb_ext->usbctl2) | 2993 BIT(U2_ENABLE), 2994 &dev->usb_ext->usbctl2); 2995 allow_status_338x(ep); 2996 goto next_endpoints3; 2997 2998 case USB_DEVICE_LTM_ENABLE: 2999 dev->ltm_enable = 1; 3000 writel(readl(&dev->usb_ext->usbctl2) | 3001 BIT(LTM_ENABLE), 3002 &dev->usb_ext->usbctl2); 3003 allow_status_338x(ep); 3004 goto next_endpoints3; 3005 default: 3006 break; 3007 } 3008 } 3009 3010 if (w_value == USB_DEVICE_REMOTE_WAKEUP) { 3011 dev->wakeup_enable = 1; 3012 writel(readl(&dev->usb->usbctl) | 3013 BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 3014 &dev->usb->usbctl); 3015 allow_status_338x(ep); 3016 break; 3017 } 3018 goto usb3_delegate; 3019 3020 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 3021 e = get_ep_by_addr(dev, w_index); 3022 if (!e || (w_value != USB_ENDPOINT_HALT)) 3023 goto do_stall3; 3024 ep->stopped = 1; 3025 if (ep->num == 0) 3026 ep->dev->protocol_stall = 1; 3027 else { 3028 if (ep->dma) 3029 abort_dma(ep); 3030 set_halt(ep); 3031 } 3032 allow_status_338x(ep); 3033 break; 3034 3035 default: 3036 goto usb3_delegate; 3037 } 3038 3039 break; 3040 default: 3041 3042 usb3_delegate: 3043 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n", 3044 r.bRequestType, r.bRequest, 3045 w_value, w_index, w_length, 3046 readl(&ep->cfg->ep_cfg)); 3047 3048 ep->responded = 0; 3049 if (dev->async_callbacks) { 3050 spin_unlock(&dev->lock); 3051 tmp = dev->driver->setup(&dev->gadget, &r); 3052 spin_lock(&dev->lock); 3053 } 3054 } 3055 do_stall3: 3056 if (tmp < 0) { 3057 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n", 3058 r.bRequestType, r.bRequest, tmp); 3059 dev->protocol_stall = 1; 3060 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */ 3061 set_halt(ep); 3062 } 3063 3064 next_endpoints3: 3065 3066 #undef w_value 3067 #undef w_index 3068 #undef w_length 3069 3070 return; 3071 } 3072 3073 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0) 3074 { 3075 u32 index; 3076 u32 bit; 3077 3078 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) { 3079 bit = BIT(ep_bit[index]); 3080 3081 if (!stat0) 3082 break; 3083 3084 if (!(stat0 & bit)) 3085 continue; 3086 3087 stat0 &= ~bit; 3088 3089 handle_ep_small(&dev->ep[index]); 3090 } 3091 } 3092 3093 static void handle_stat0_irqs(struct net2280 *dev, u32 stat) 3094 { 3095 struct net2280_ep *ep; 3096 u32 num, scratch; 3097 3098 /* most of these don't need individual acks */ 3099 stat &= ~BIT(INTA_ASSERTED); 3100 if (!stat) 3101 return; 3102 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */ 3103 3104 /* starting a control request? */ 3105 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) { 3106 union { 3107 u32 raw[2]; 3108 struct usb_ctrlrequest r; 3109 } u; 3110 int tmp; 3111 struct net2280_request *req; 3112 3113 if (dev->gadget.speed == USB_SPEED_UNKNOWN) { 3114 u32 val = readl(&dev->usb->usbstat); 3115 if (val & BIT(SUPER_SPEED)) { 3116 dev->gadget.speed = USB_SPEED_SUPER; 3117 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3118 EP0_SS_MAX_PACKET_SIZE); 3119 } else if (val & BIT(HIGH_SPEED)) { 3120 dev->gadget.speed = USB_SPEED_HIGH; 3121 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3122 EP0_HS_MAX_PACKET_SIZE); 3123 } else { 3124 dev->gadget.speed = USB_SPEED_FULL; 3125 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3126 EP0_HS_MAX_PACKET_SIZE); 3127 } 3128 net2280_led_speed(dev, dev->gadget.speed); 3129 ep_dbg(dev, "%s\n", 3130 usb_speed_string(dev->gadget.speed)); 3131 } 3132 3133 ep = &dev->ep[0]; 3134 ep->irqs++; 3135 3136 /* make sure any leftover request state is cleared */ 3137 stat &= ~BIT(ENDPOINT_0_INTERRUPT); 3138 while (!list_empty(&ep->queue)) { 3139 req = list_entry(ep->queue.next, 3140 struct net2280_request, queue); 3141 done(ep, req, (req->req.actual == req->req.length) 3142 ? 0 : -EPROTO); 3143 } 3144 ep->stopped = 0; 3145 dev->protocol_stall = 0; 3146 if (!(dev->quirks & PLX_PCIE)) { 3147 if (ep->dev->quirks & PLX_2280) 3148 tmp = BIT(FIFO_OVERFLOW) | 3149 BIT(FIFO_UNDERFLOW); 3150 else 3151 tmp = 0; 3152 3153 writel(tmp | BIT(TIMEOUT) | 3154 BIT(USB_STALL_SENT) | 3155 BIT(USB_IN_NAK_SENT) | 3156 BIT(USB_IN_ACK_RCVD) | 3157 BIT(USB_OUT_PING_NAK_SENT) | 3158 BIT(USB_OUT_ACK_SENT) | 3159 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) | 3160 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) | 3161 BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 3162 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 3163 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3164 BIT(DATA_IN_TOKEN_INTERRUPT), 3165 &ep->regs->ep_stat); 3166 } 3167 u.raw[0] = readl(&dev->usb->setup0123); 3168 u.raw[1] = readl(&dev->usb->setup4567); 3169 3170 cpu_to_le32s(&u.raw[0]); 3171 cpu_to_le32s(&u.raw[1]); 3172 3173 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched) 3174 defect7374_workaround(dev, u.r); 3175 3176 tmp = 0; 3177 3178 #define w_value le16_to_cpu(u.r.wValue) 3179 #define w_index le16_to_cpu(u.r.wIndex) 3180 #define w_length le16_to_cpu(u.r.wLength) 3181 3182 /* ack the irq */ 3183 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0); 3184 stat ^= BIT(SETUP_PACKET_INTERRUPT); 3185 3186 /* watch control traffic at the token level, and force 3187 * synchronization before letting the status stage happen. 3188 * FIXME ignore tokens we'll NAK, until driver responds. 3189 * that'll mean a lot less irqs for some drivers. 3190 */ 3191 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; 3192 if (ep->is_in) { 3193 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 3194 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3195 BIT(DATA_IN_TOKEN_INTERRUPT); 3196 stop_out_naking(ep); 3197 } else 3198 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 3199 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3200 BIT(DATA_IN_TOKEN_INTERRUPT); 3201 writel(scratch, &dev->epregs[0].ep_irqenb); 3202 3203 /* we made the hardware handle most lowlevel requests; 3204 * everything else goes uplevel to the gadget code. 3205 */ 3206 ep->responded = 1; 3207 3208 if (dev->gadget.speed == USB_SPEED_SUPER) { 3209 handle_stat0_irqs_superspeed(dev, ep, u.r); 3210 goto next_endpoints; 3211 } 3212 3213 switch (u.r.bRequest) { 3214 case USB_REQ_GET_STATUS: { 3215 struct net2280_ep *e; 3216 __le32 status; 3217 3218 /* hw handles device and interface status */ 3219 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) 3220 goto delegate; 3221 e = get_ep_by_addr(dev, w_index); 3222 if (!e || w_length > 2) 3223 goto do_stall; 3224 3225 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT)) 3226 status = cpu_to_le32(1); 3227 else 3228 status = cpu_to_le32(0); 3229 3230 /* don't bother with a request object! */ 3231 writel(0, &dev->epregs[0].ep_irqenb); 3232 set_fifo_bytecount(ep, w_length); 3233 writel((__force u32)status, &dev->epregs[0].ep_data); 3234 allow_status(ep); 3235 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status); 3236 goto next_endpoints; 3237 } 3238 break; 3239 case USB_REQ_CLEAR_FEATURE: { 3240 struct net2280_ep *e; 3241 3242 /* hw handles device features */ 3243 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 3244 goto delegate; 3245 if (w_value != USB_ENDPOINT_HALT || w_length != 0) 3246 goto do_stall; 3247 e = get_ep_by_addr(dev, w_index); 3248 if (!e) 3249 goto do_stall; 3250 if (e->wedged) { 3251 ep_vdbg(dev, "%s wedged, halt not cleared\n", 3252 ep->ep.name); 3253 } else { 3254 ep_vdbg(dev, "%s clear halt\n", e->ep.name); 3255 clear_halt(e); 3256 if ((ep->dev->quirks & PLX_PCIE) && 3257 !list_empty(&e->queue) && e->td_dma) 3258 restart_dma(e); 3259 } 3260 allow_status(ep); 3261 goto next_endpoints; 3262 } 3263 break; 3264 case USB_REQ_SET_FEATURE: { 3265 struct net2280_ep *e; 3266 3267 /* hw handles device features */ 3268 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 3269 goto delegate; 3270 if (w_value != USB_ENDPOINT_HALT || w_length != 0) 3271 goto do_stall; 3272 e = get_ep_by_addr(dev, w_index); 3273 if (!e) 3274 goto do_stall; 3275 if (e->ep.name == ep0name) 3276 goto do_stall; 3277 set_halt(e); 3278 if ((dev->quirks & PLX_PCIE) && e->dma) 3279 abort_dma(e); 3280 allow_status(ep); 3281 ep_vdbg(dev, "%s set halt\n", ep->ep.name); 3282 goto next_endpoints; 3283 } 3284 break; 3285 default: 3286 delegate: 3287 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x " 3288 "ep_cfg %08x\n", 3289 u.r.bRequestType, u.r.bRequest, 3290 w_value, w_index, w_length, 3291 readl(&ep->cfg->ep_cfg)); 3292 ep->responded = 0; 3293 if (dev->async_callbacks) { 3294 spin_unlock(&dev->lock); 3295 tmp = dev->driver->setup(&dev->gadget, &u.r); 3296 spin_lock(&dev->lock); 3297 } 3298 } 3299 3300 /* stall ep0 on error */ 3301 if (tmp < 0) { 3302 do_stall: 3303 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n", 3304 u.r.bRequestType, u.r.bRequest, tmp); 3305 dev->protocol_stall = 1; 3306 } 3307 3308 /* some in/out token irq should follow; maybe stall then. 3309 * driver must queue a request (even zlp) or halt ep0 3310 * before the host times out. 3311 */ 3312 } 3313 3314 #undef w_value 3315 #undef w_index 3316 #undef w_length 3317 3318 next_endpoints: 3319 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) { 3320 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) | 3321 USB3380_IRQSTAT0_EP_INTR_MASK_IN | 3322 USB3380_IRQSTAT0_EP_INTR_MASK_OUT); 3323 3324 if (stat & mask) { 3325 usb338x_handle_ep_intr(dev, stat & mask); 3326 stat &= ~mask; 3327 } 3328 } else { 3329 /* endpoint data irq ? */ 3330 scratch = stat & 0x7f; 3331 stat &= ~0x7f; 3332 for (num = 0; scratch; num++) { 3333 u32 t; 3334 3335 /* do this endpoint's FIFO and queue need tending? */ 3336 t = BIT(num); 3337 if ((scratch & t) == 0) 3338 continue; 3339 scratch ^= t; 3340 3341 ep = &dev->ep[num]; 3342 handle_ep_small(ep); 3343 } 3344 } 3345 3346 if (stat) 3347 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat); 3348 } 3349 3350 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \ 3351 BIT(DMA_C_INTERRUPT) | \ 3352 BIT(DMA_B_INTERRUPT) | \ 3353 BIT(DMA_A_INTERRUPT)) 3354 #define PCI_ERROR_INTERRUPTS ( \ 3355 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \ 3356 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \ 3357 BIT(PCI_RETRY_ABORT_INTERRUPT)) 3358 3359 static void handle_stat1_irqs(struct net2280 *dev, u32 stat) 3360 __releases(dev->lock) 3361 __acquires(dev->lock) 3362 { 3363 struct net2280_ep *ep; 3364 u32 tmp, num, mask, scratch; 3365 3366 /* after disconnect there's nothing else to do! */ 3367 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT); 3368 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED); 3369 3370 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. 3371 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and 3372 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT 3373 * only indicates a change in the reset state). 3374 */ 3375 if (stat & tmp) { 3376 bool reset = false; 3377 bool disconnect = false; 3378 3379 /* 3380 * Ignore disconnects and resets if the speed hasn't been set. 3381 * VBUS can bounce and there's always an initial reset. 3382 */ 3383 writel(tmp, &dev->regs->irqstat1); 3384 if (dev->gadget.speed != USB_SPEED_UNKNOWN) { 3385 if ((stat & BIT(VBUS_INTERRUPT)) && 3386 (readl(&dev->usb->usbctl) & 3387 BIT(VBUS_PIN)) == 0) { 3388 disconnect = true; 3389 ep_dbg(dev, "disconnect %s\n", 3390 dev->driver->driver.name); 3391 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) && 3392 (readl(&dev->usb->usbstat) & mask) 3393 == 0) { 3394 reset = true; 3395 ep_dbg(dev, "reset %s\n", 3396 dev->driver->driver.name); 3397 } 3398 3399 if (disconnect || reset) { 3400 stop_activity(dev, dev->driver); 3401 ep0_start(dev); 3402 if (dev->async_callbacks) { 3403 spin_unlock(&dev->lock); 3404 if (reset) 3405 usb_gadget_udc_reset(&dev->gadget, dev->driver); 3406 else 3407 (dev->driver->disconnect)(&dev->gadget); 3408 spin_lock(&dev->lock); 3409 } 3410 return; 3411 } 3412 } 3413 stat &= ~tmp; 3414 3415 /* vBUS can bounce ... one of many reasons to ignore the 3416 * notion of hotplug events on bus connect/disconnect! 3417 */ 3418 if (!stat) 3419 return; 3420 } 3421 3422 /* NOTE: chip stays in PCI D0 state for now, but it could 3423 * enter D1 to save more power 3424 */ 3425 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT); 3426 if (stat & tmp) { 3427 writel(tmp, &dev->regs->irqstat1); 3428 spin_unlock(&dev->lock); 3429 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) { 3430 if (dev->async_callbacks && dev->driver->suspend) 3431 dev->driver->suspend(&dev->gadget); 3432 if (!enable_suspend) 3433 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT); 3434 } else { 3435 if (dev->async_callbacks && dev->driver->resume) 3436 dev->driver->resume(&dev->gadget); 3437 /* at high speed, note erratum 0133 */ 3438 } 3439 spin_lock(&dev->lock); 3440 stat &= ~tmp; 3441 } 3442 3443 /* clear any other status/irqs */ 3444 if (stat) 3445 writel(stat, &dev->regs->irqstat1); 3446 3447 /* some status we can just ignore */ 3448 if (dev->quirks & PLX_2280) 3449 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) | 3450 BIT(SUSPEND_REQUEST_INTERRUPT) | 3451 BIT(RESUME_INTERRUPT) | 3452 BIT(SOF_INTERRUPT)); 3453 else 3454 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) | 3455 BIT(RESUME_INTERRUPT) | 3456 BIT(SOF_DOWN_INTERRUPT) | 3457 BIT(SOF_INTERRUPT)); 3458 3459 if (!stat) 3460 return; 3461 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/ 3462 3463 /* DMA status, for ep-{a,b,c,d} */ 3464 scratch = stat & DMA_INTERRUPTS; 3465 stat &= ~DMA_INTERRUPTS; 3466 scratch >>= 9; 3467 for (num = 0; scratch; num++) { 3468 struct net2280_dma_regs __iomem *dma; 3469 3470 tmp = BIT(num); 3471 if ((tmp & scratch) == 0) 3472 continue; 3473 scratch ^= tmp; 3474 3475 ep = &dev->ep[num + 1]; 3476 dma = ep->dma; 3477 3478 if (!dma) 3479 continue; 3480 3481 /* clear ep's dma status */ 3482 tmp = readl(&dma->dmastat); 3483 writel(tmp, &dma->dmastat); 3484 3485 /* dma sync*/ 3486 if (dev->quirks & PLX_PCIE) { 3487 u32 r_dmacount = readl(&dma->dmacount); 3488 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) && 3489 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) 3490 continue; 3491 } 3492 3493 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) { 3494 ep_dbg(ep->dev, "%s no xact done? %08x\n", 3495 ep->ep.name, tmp); 3496 continue; 3497 } 3498 stop_dma(ep->dma); 3499 3500 /* OUT transfers terminate when the data from the 3501 * host is in our memory. Process whatever's done. 3502 * On this path, we know transfer's last packet wasn't 3503 * less than req->length. NAK_OUT_PACKETS may be set, 3504 * or the FIFO may already be holding new packets. 3505 * 3506 * IN transfers can linger in the FIFO for a very 3507 * long time ... we ignore that for now, accounting 3508 * precisely (like PIO does) needs per-packet irqs 3509 */ 3510 scan_dma_completions(ep); 3511 3512 /* disable dma on inactive queues; else maybe restart */ 3513 if (!list_empty(&ep->queue)) { 3514 tmp = readl(&dma->dmactl); 3515 restart_dma(ep); 3516 } 3517 ep->irqs++; 3518 } 3519 3520 /* NOTE: there are other PCI errors we might usefully notice. 3521 * if they appear very often, here's where to try recovering. 3522 */ 3523 if (stat & PCI_ERROR_INTERRUPTS) { 3524 ep_err(dev, "pci dma error; stat %08x\n", stat); 3525 stat &= ~PCI_ERROR_INTERRUPTS; 3526 /* these are fatal errors, but "maybe" they won't 3527 * happen again ... 3528 */ 3529 stop_activity(dev, dev->driver); 3530 ep0_start(dev); 3531 stat = 0; 3532 } 3533 3534 if (stat) 3535 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat); 3536 } 3537 3538 static irqreturn_t net2280_irq(int irq, void *_dev) 3539 { 3540 struct net2280 *dev = _dev; 3541 3542 /* shared interrupt, not ours */ 3543 if ((dev->quirks & PLX_LEGACY) && 3544 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED)))) 3545 return IRQ_NONE; 3546 3547 spin_lock(&dev->lock); 3548 3549 /* handle disconnect, dma, and more */ 3550 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1)); 3551 3552 /* control requests and PIO */ 3553 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0)); 3554 3555 if (dev->quirks & PLX_PCIE) { 3556 /* re-enable interrupt to trigger any possible new interrupt */ 3557 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1); 3558 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1); 3559 writel(pciirqenb1, &dev->regs->pciirqenb1); 3560 } 3561 3562 spin_unlock(&dev->lock); 3563 3564 return IRQ_HANDLED; 3565 } 3566 3567 /*-------------------------------------------------------------------------*/ 3568 3569 static void gadget_release(struct device *_dev) 3570 { 3571 struct net2280 *dev = container_of(_dev, struct net2280, gadget.dev); 3572 3573 kfree(dev); 3574 } 3575 3576 /* tear down the binding between this driver and the pci device */ 3577 3578 static void net2280_remove(struct pci_dev *pdev) 3579 { 3580 struct net2280 *dev = pci_get_drvdata(pdev); 3581 3582 if (dev->added) 3583 usb_del_gadget(&dev->gadget); 3584 3585 BUG_ON(dev->driver); 3586 3587 /* then clean up the resources we allocated during probe() */ 3588 if (dev->requests) { 3589 int i; 3590 for (i = 1; i < 5; i++) { 3591 if (!dev->ep[i].dummy) 3592 continue; 3593 dma_pool_free(dev->requests, dev->ep[i].dummy, 3594 dev->ep[i].td_dma); 3595 } 3596 dma_pool_destroy(dev->requests); 3597 } 3598 if (dev->got_irq) 3599 free_irq(pdev->irq, dev); 3600 if (dev->quirks & PLX_PCIE) 3601 pci_disable_msi(pdev); 3602 if (dev->regs) { 3603 net2280_led_shutdown(dev); 3604 iounmap(dev->regs); 3605 } 3606 if (dev->region) 3607 release_mem_region(pci_resource_start(pdev, 0), 3608 pci_resource_len(pdev, 0)); 3609 if (dev->enabled) 3610 pci_disable_device(pdev); 3611 device_remove_file(&pdev->dev, &dev_attr_registers); 3612 3613 ep_info(dev, "unbind\n"); 3614 usb_put_gadget(&dev->gadget); 3615 } 3616 3617 /* wrap this driver around the specified device, but 3618 * don't respond over USB until a gadget driver binds to us. 3619 */ 3620 3621 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id) 3622 { 3623 struct net2280 *dev; 3624 unsigned long resource, len; 3625 void __iomem *base = NULL; 3626 int retval, i; 3627 3628 /* alloc, and start init */ 3629 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 3630 if (dev == NULL) { 3631 retval = -ENOMEM; 3632 goto done; 3633 } 3634 3635 pci_set_drvdata(pdev, dev); 3636 usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release); 3637 spin_lock_init(&dev->lock); 3638 dev->quirks = id->driver_data; 3639 dev->pdev = pdev; 3640 dev->gadget.ops = &net2280_ops; 3641 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ? 3642 USB_SPEED_SUPER : USB_SPEED_HIGH; 3643 3644 /* the "gadget" abstracts/virtualizes the controller */ 3645 dev->gadget.name = driver_name; 3646 3647 /* now all the pci goodies ... */ 3648 if (pci_enable_device(pdev) < 0) { 3649 retval = -ENODEV; 3650 goto done; 3651 } 3652 dev->enabled = 1; 3653 3654 /* BAR 0 holds all the registers 3655 * BAR 1 is 8051 memory; unused here (note erratum 0103) 3656 * BAR 2 is fifo memory; unused here 3657 */ 3658 resource = pci_resource_start(pdev, 0); 3659 len = pci_resource_len(pdev, 0); 3660 if (!request_mem_region(resource, len, driver_name)) { 3661 ep_dbg(dev, "controller already in use\n"); 3662 retval = -EBUSY; 3663 goto done; 3664 } 3665 dev->region = 1; 3666 3667 /* FIXME provide firmware download interface to put 3668 * 8051 code into the chip, e.g. to turn on PCI PM. 3669 */ 3670 3671 base = ioremap(resource, len); 3672 if (base == NULL) { 3673 ep_dbg(dev, "can't map memory\n"); 3674 retval = -EFAULT; 3675 goto done; 3676 } 3677 dev->regs = (struct net2280_regs __iomem *) base; 3678 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); 3679 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); 3680 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); 3681 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); 3682 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); 3683 3684 if (dev->quirks & PLX_PCIE) { 3685 u32 fsmvalue; 3686 u32 usbstat; 3687 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *) 3688 (base + 0x00b4); 3689 dev->llregs = (struct usb338x_ll_regs __iomem *) 3690 (base + 0x0700); 3691 dev->plregs = (struct usb338x_pl_regs __iomem *) 3692 (base + 0x0800); 3693 usbstat = readl(&dev->usb->usbstat); 3694 dev->enhanced_mode = !!(usbstat & BIT(11)); 3695 dev->n_ep = (dev->enhanced_mode) ? 9 : 5; 3696 /* put into initial config, link up all endpoints */ 3697 fsmvalue = get_idx_reg(dev->regs, SCRATCH) & 3698 (0xf << DEFECT7374_FSM_FIELD); 3699 /* See if firmware needs to set up for workaround: */ 3700 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) { 3701 dev->bug7734_patched = 1; 3702 writel(0, &dev->usb->usbctl); 3703 } else 3704 dev->bug7734_patched = 0; 3705 } else { 3706 dev->enhanced_mode = 0; 3707 dev->n_ep = 7; 3708 /* put into initial config, link up all endpoints */ 3709 writel(0, &dev->usb->usbctl); 3710 } 3711 3712 usb_reset(dev); 3713 usb_reinit(dev); 3714 3715 /* irq setup after old hardware is cleaned up */ 3716 if (!pdev->irq) { 3717 ep_err(dev, "No IRQ. Check PCI setup!\n"); 3718 retval = -ENODEV; 3719 goto done; 3720 } 3721 3722 if (dev->quirks & PLX_PCIE) 3723 if (pci_enable_msi(pdev)) 3724 ep_err(dev, "Failed to enable MSI mode\n"); 3725 3726 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED, 3727 driver_name, dev)) { 3728 ep_err(dev, "request interrupt %d failed\n", pdev->irq); 3729 retval = -EBUSY; 3730 goto done; 3731 } 3732 dev->got_irq = 1; 3733 3734 /* DMA setup */ 3735 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ 3736 dev->requests = dma_pool_create("requests", &pdev->dev, 3737 sizeof(struct net2280_dma), 3738 0 /* no alignment requirements */, 3739 0 /* or page-crossing issues */); 3740 if (!dev->requests) { 3741 ep_dbg(dev, "can't get request pool\n"); 3742 retval = -ENOMEM; 3743 goto done; 3744 } 3745 for (i = 1; i < 5; i++) { 3746 struct net2280_dma *td; 3747 3748 td = dma_pool_alloc(dev->requests, GFP_KERNEL, 3749 &dev->ep[i].td_dma); 3750 if (!td) { 3751 ep_dbg(dev, "can't get dummy %d\n", i); 3752 retval = -ENOMEM; 3753 goto done; 3754 } 3755 td->dmacount = 0; /* not VALID */ 3756 td->dmadesc = td->dmaaddr; 3757 dev->ep[i].dummy = td; 3758 } 3759 3760 /* enable lower-overhead pci memory bursts during DMA */ 3761 if (dev->quirks & PLX_LEGACY) 3762 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) | 3763 /* 3764 * 256 write retries may not be enough... 3765 BIT(PCI_RETRY_ABORT_ENABLE) | 3766 */ 3767 BIT(DMA_READ_MULTIPLE_ENABLE) | 3768 BIT(DMA_READ_LINE_ENABLE), 3769 &dev->pci->pcimstctl); 3770 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ 3771 pci_set_master(pdev); 3772 pci_try_set_mwi(pdev); 3773 3774 /* ... also flushes any posted pci writes */ 3775 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff; 3776 3777 /* done */ 3778 ep_info(dev, "%s\n", driver_desc); 3779 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n", 3780 pdev->irq, base, dev->chiprev); 3781 ep_info(dev, "version: " DRIVER_VERSION "; %s\n", 3782 dev->enhanced_mode ? "enhanced mode" : "legacy mode"); 3783 retval = device_create_file(&pdev->dev, &dev_attr_registers); 3784 if (retval) 3785 goto done; 3786 3787 retval = usb_add_gadget(&dev->gadget); 3788 if (retval) 3789 goto done; 3790 dev->added = 1; 3791 return 0; 3792 3793 done: 3794 if (dev) { 3795 net2280_remove(pdev); 3796 kfree(dev); 3797 } 3798 return retval; 3799 } 3800 3801 /* make sure the board is quiescent; otherwise it will continue 3802 * generating IRQs across the upcoming reboot. 3803 */ 3804 3805 static void net2280_shutdown(struct pci_dev *pdev) 3806 { 3807 struct net2280 *dev = pci_get_drvdata(pdev); 3808 3809 /* disable IRQs */ 3810 writel(0, &dev->regs->pciirqenb0); 3811 writel(0, &dev->regs->pciirqenb1); 3812 3813 /* disable the pullup so the host will think we're gone */ 3814 writel(0, &dev->usb->usbctl); 3815 3816 } 3817 3818 3819 /*-------------------------------------------------------------------------*/ 3820 3821 static const struct pci_device_id pci_ids[] = { { 3822 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3823 .class_mask = ~0, 3824 .vendor = PCI_VENDOR_ID_PLX_LEGACY, 3825 .device = 0x2280, 3826 .subvendor = PCI_ANY_ID, 3827 .subdevice = PCI_ANY_ID, 3828 .driver_data = PLX_LEGACY | PLX_2280, 3829 }, { 3830 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3831 .class_mask = ~0, 3832 .vendor = PCI_VENDOR_ID_PLX_LEGACY, 3833 .device = 0x2282, 3834 .subvendor = PCI_ANY_ID, 3835 .subdevice = PCI_ANY_ID, 3836 .driver_data = PLX_LEGACY, 3837 }, 3838 { 3839 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3840 .class_mask = ~0, 3841 .vendor = PCI_VENDOR_ID_PLX, 3842 .device = 0x2380, 3843 .subvendor = PCI_ANY_ID, 3844 .subdevice = PCI_ANY_ID, 3845 .driver_data = PLX_PCIE, 3846 }, 3847 { 3848 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), 3849 .class_mask = ~0, 3850 .vendor = PCI_VENDOR_ID_PLX, 3851 .device = 0x3380, 3852 .subvendor = PCI_ANY_ID, 3853 .subdevice = PCI_ANY_ID, 3854 .driver_data = PLX_PCIE | PLX_SUPERSPEED, 3855 }, 3856 { 3857 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3858 .class_mask = ~0, 3859 .vendor = PCI_VENDOR_ID_PLX, 3860 .device = 0x3382, 3861 .subvendor = PCI_ANY_ID, 3862 .subdevice = PCI_ANY_ID, 3863 .driver_data = PLX_PCIE | PLX_SUPERSPEED, 3864 }, 3865 { /* end: all zeroes */ } 3866 }; 3867 MODULE_DEVICE_TABLE(pci, pci_ids); 3868 3869 /* pci driver glue; this is a "new style" PCI driver module */ 3870 static struct pci_driver net2280_pci_driver = { 3871 .name = driver_name, 3872 .id_table = pci_ids, 3873 3874 .probe = net2280_probe, 3875 .remove = net2280_remove, 3876 .shutdown = net2280_shutdown, 3877 3878 /* FIXME add power management support */ 3879 }; 3880 3881 module_pci_driver(net2280_pci_driver); 3882 3883 MODULE_DESCRIPTION(DRIVER_DESC); 3884 MODULE_AUTHOR("David Brownell"); 3885 MODULE_LICENSE("GPL"); 3886