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