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