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 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable); 1621 1622 static const struct usb_gadget_ops net2280_ops = { 1623 .get_frame = net2280_get_frame, 1624 .wakeup = net2280_wakeup, 1625 .set_selfpowered = net2280_set_selfpowered, 1626 .pullup = net2280_pullup, 1627 .udc_start = net2280_start, 1628 .udc_stop = net2280_stop, 1629 .udc_async_callbacks = net2280_async_callbacks, 1630 .match_ep = net2280_match_ep, 1631 }; 1632 1633 /*-------------------------------------------------------------------------*/ 1634 1635 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1636 1637 /* FIXME move these into procfs, and use seq_file. 1638 * Sysfs _still_ doesn't behave for arbitrarily sized files, 1639 * and also doesn't help products using this with 2.4 kernels. 1640 */ 1641 1642 /* "function" sysfs attribute */ 1643 static ssize_t function_show(struct device *_dev, struct device_attribute *attr, 1644 char *buf) 1645 { 1646 struct net2280 *dev = dev_get_drvdata(_dev); 1647 1648 if (!dev->driver || !dev->driver->function || 1649 strlen(dev->driver->function) > PAGE_SIZE) 1650 return 0; 1651 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function); 1652 } 1653 static DEVICE_ATTR_RO(function); 1654 1655 static ssize_t registers_show(struct device *_dev, 1656 struct device_attribute *attr, char *buf) 1657 { 1658 struct net2280 *dev; 1659 char *next; 1660 unsigned size, t; 1661 unsigned long flags; 1662 int i; 1663 u32 t1, t2; 1664 const char *s; 1665 1666 dev = dev_get_drvdata(_dev); 1667 next = buf; 1668 size = PAGE_SIZE; 1669 spin_lock_irqsave(&dev->lock, flags); 1670 1671 if (dev->driver) 1672 s = dev->driver->driver.name; 1673 else 1674 s = "(none)"; 1675 1676 /* Main Control Registers */ 1677 t = scnprintf(next, size, "%s version " DRIVER_VERSION 1678 ", chiprev %04x\n\n" 1679 "devinit %03x fifoctl %08x gadget '%s'\n" 1680 "pci irqenb0 %02x irqenb1 %08x " 1681 "irqstat0 %04x irqstat1 %08x\n", 1682 driver_name, dev->chiprev, 1683 readl(&dev->regs->devinit), 1684 readl(&dev->regs->fifoctl), 1685 s, 1686 readl(&dev->regs->pciirqenb0), 1687 readl(&dev->regs->pciirqenb1), 1688 readl(&dev->regs->irqstat0), 1689 readl(&dev->regs->irqstat1)); 1690 size -= t; 1691 next += t; 1692 1693 /* USB Control Registers */ 1694 t1 = readl(&dev->usb->usbctl); 1695 t2 = readl(&dev->usb->usbstat); 1696 if (t1 & BIT(VBUS_PIN)) { 1697 if (t2 & BIT(HIGH_SPEED)) 1698 s = "high speed"; 1699 else if (dev->gadget.speed == USB_SPEED_UNKNOWN) 1700 s = "powered"; 1701 else 1702 s = "full speed"; 1703 /* full speed bit (6) not working?? */ 1704 } else 1705 s = "not attached"; 1706 t = scnprintf(next, size, 1707 "stdrsp %08x usbctl %08x usbstat %08x " 1708 "addr 0x%02x (%s)\n", 1709 readl(&dev->usb->stdrsp), t1, t2, 1710 readl(&dev->usb->ouraddr), s); 1711 size -= t; 1712 next += t; 1713 1714 /* PCI Master Control Registers */ 1715 1716 /* DMA Control Registers */ 1717 1718 /* Configurable EP Control Registers */ 1719 for (i = 0; i < dev->n_ep; i++) { 1720 struct net2280_ep *ep; 1721 1722 ep = &dev->ep[i]; 1723 if (i && !ep->desc) 1724 continue; 1725 1726 t1 = readl(&ep->cfg->ep_cfg); 1727 t2 = readl(&ep->regs->ep_rsp) & 0xff; 1728 t = scnprintf(next, size, 1729 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" 1730 "irqenb %02x\n", 1731 ep->ep.name, t1, t2, 1732 (t2 & BIT(CLEAR_NAK_OUT_PACKETS)) 1733 ? "NAK " : "", 1734 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE)) 1735 ? "hide " : "", 1736 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR)) 1737 ? "CRC " : "", 1738 (t2 & BIT(CLEAR_INTERRUPT_MODE)) 1739 ? "interrupt " : "", 1740 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) 1741 ? "status " : "", 1742 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE)) 1743 ? "NAKmode " : "", 1744 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE)) 1745 ? "DATA1 " : "DATA0 ", 1746 (t2 & BIT(CLEAR_ENDPOINT_HALT)) 1747 ? "HALT " : "", 1748 readl(&ep->regs->ep_irqenb)); 1749 size -= t; 1750 next += t; 1751 1752 t = scnprintf(next, size, 1753 "\tstat %08x avail %04x " 1754 "(ep%d%s-%s)%s\n", 1755 readl(&ep->regs->ep_stat), 1756 readl(&ep->regs->ep_avail), 1757 t1 & 0x0f, DIR_STRING(t1), 1758 type_string(t1 >> 8), 1759 ep->stopped ? "*" : ""); 1760 size -= t; 1761 next += t; 1762 1763 if (!ep->dma) 1764 continue; 1765 1766 t = scnprintf(next, size, 1767 " dma\tctl %08x stat %08x count %08x\n" 1768 "\taddr %08x desc %08x\n", 1769 readl(&ep->dma->dmactl), 1770 readl(&ep->dma->dmastat), 1771 readl(&ep->dma->dmacount), 1772 readl(&ep->dma->dmaaddr), 1773 readl(&ep->dma->dmadesc)); 1774 size -= t; 1775 next += t; 1776 1777 } 1778 1779 /* Indexed Registers (none yet) */ 1780 1781 /* Statistics */ 1782 t = scnprintf(next, size, "\nirqs: "); 1783 size -= t; 1784 next += t; 1785 for (i = 0; i < dev->n_ep; i++) { 1786 struct net2280_ep *ep; 1787 1788 ep = &dev->ep[i]; 1789 if (i && !ep->irqs) 1790 continue; 1791 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs); 1792 size -= t; 1793 next += t; 1794 1795 } 1796 t = scnprintf(next, size, "\n"); 1797 size -= t; 1798 next += t; 1799 1800 spin_unlock_irqrestore(&dev->lock, flags); 1801 1802 return PAGE_SIZE - size; 1803 } 1804 static DEVICE_ATTR_RO(registers); 1805 1806 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr, 1807 char *buf) 1808 { 1809 struct net2280 *dev; 1810 char *next; 1811 unsigned size; 1812 unsigned long flags; 1813 int i; 1814 1815 dev = dev_get_drvdata(_dev); 1816 next = buf; 1817 size = PAGE_SIZE; 1818 spin_lock_irqsave(&dev->lock, flags); 1819 1820 for (i = 0; i < dev->n_ep; i++) { 1821 struct net2280_ep *ep = &dev->ep[i]; 1822 struct net2280_request *req; 1823 int t; 1824 1825 if (i != 0) { 1826 const struct usb_endpoint_descriptor *d; 1827 1828 d = ep->desc; 1829 if (!d) 1830 continue; 1831 t = d->bEndpointAddress; 1832 t = scnprintf(next, size, 1833 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", 1834 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, 1835 (t & USB_DIR_IN) ? "in" : "out", 1836 type_string(d->bmAttributes), 1837 usb_endpoint_maxp(d), 1838 ep->dma ? "dma" : "pio", ep->fifo_size 1839 ); 1840 } else /* ep0 should only have one transfer queued */ 1841 t = scnprintf(next, size, "ep0 max 64 pio %s\n", 1842 ep->is_in ? "in" : "out"); 1843 if (t <= 0 || t > size) 1844 goto done; 1845 size -= t; 1846 next += t; 1847 1848 if (list_empty(&ep->queue)) { 1849 t = scnprintf(next, size, "\t(nothing queued)\n"); 1850 if (t <= 0 || t > size) 1851 goto done; 1852 size -= t; 1853 next += t; 1854 continue; 1855 } 1856 list_for_each_entry(req, &ep->queue, queue) { 1857 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc)) 1858 t = scnprintf(next, size, 1859 "\treq %p len %d/%d " 1860 "buf %p (dmacount %08x)\n", 1861 &req->req, req->req.actual, 1862 req->req.length, req->req.buf, 1863 readl(&ep->dma->dmacount)); 1864 else 1865 t = scnprintf(next, size, 1866 "\treq %p len %d/%d buf %p\n", 1867 &req->req, req->req.actual, 1868 req->req.length, req->req.buf); 1869 if (t <= 0 || t > size) 1870 goto done; 1871 size -= t; 1872 next += t; 1873 1874 if (ep->dma) { 1875 struct net2280_dma *td; 1876 1877 td = req->td; 1878 t = scnprintf(next, size, "\t td %08x " 1879 " count %08x buf %08x desc %08x\n", 1880 (u32) req->td_dma, 1881 le32_to_cpu(td->dmacount), 1882 le32_to_cpu(td->dmaaddr), 1883 le32_to_cpu(td->dmadesc)); 1884 if (t <= 0 || t > size) 1885 goto done; 1886 size -= t; 1887 next += t; 1888 } 1889 } 1890 } 1891 1892 done: 1893 spin_unlock_irqrestore(&dev->lock, flags); 1894 return PAGE_SIZE - size; 1895 } 1896 static DEVICE_ATTR_RO(queues); 1897 1898 1899 #else 1900 1901 #define device_create_file(a, b) (0) 1902 #define device_remove_file(a, b) do { } while (0) 1903 1904 #endif 1905 1906 /*-------------------------------------------------------------------------*/ 1907 1908 /* another driver-specific mode might be a request type doing dma 1909 * to/from another device fifo instead of to/from memory. 1910 */ 1911 1912 static void set_fifo_mode(struct net2280 *dev, int mode) 1913 { 1914 /* keeping high bits preserves BAR2 */ 1915 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); 1916 1917 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ 1918 INIT_LIST_HEAD(&dev->gadget.ep_list); 1919 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list); 1920 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list); 1921 switch (mode) { 1922 case 0: 1923 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list); 1924 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list); 1925 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024; 1926 break; 1927 case 1: 1928 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048; 1929 break; 1930 case 2: 1931 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list); 1932 dev->ep[1].fifo_size = 2048; 1933 dev->ep[2].fifo_size = 1024; 1934 break; 1935 } 1936 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ 1937 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list); 1938 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list); 1939 } 1940 1941 static void defect7374_disable_data_eps(struct net2280 *dev) 1942 { 1943 /* 1944 * For Defect 7374, disable data EPs (and more): 1945 * - This phase undoes the earlier phase of the Defect 7374 workaround, 1946 * returing ep regs back to normal. 1947 */ 1948 struct net2280_ep *ep; 1949 int i; 1950 unsigned char ep_sel; 1951 u32 tmp_reg; 1952 1953 for (i = 1; i < 5; i++) { 1954 ep = &dev->ep[i]; 1955 writel(i, &ep->cfg->ep_cfg); 1956 } 1957 1958 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */ 1959 for (i = 0; i < 6; i++) 1960 writel(0, &dev->dep[i].dep_cfg); 1961 1962 for (ep_sel = 0; ep_sel <= 21; ep_sel++) { 1963 /* Select an endpoint for subsequent operations: */ 1964 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 1965 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl); 1966 1967 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) || 1968 ep_sel == 18 || ep_sel == 20) 1969 continue; 1970 1971 /* Change settings on some selected endpoints */ 1972 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4); 1973 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR); 1974 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4); 1975 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 1976 tmp_reg |= BIT(EP_INITIALIZED); 1977 writel(tmp_reg, &dev->plregs->pl_ep_ctrl); 1978 } 1979 } 1980 1981 static void defect7374_enable_data_eps_zero(struct net2280 *dev) 1982 { 1983 u32 tmp = 0, tmp_reg; 1984 u32 scratch; 1985 int i; 1986 unsigned char ep_sel; 1987 1988 scratch = get_idx_reg(dev->regs, SCRATCH); 1989 1990 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD)) 1991 == DEFECT7374_FSM_SS_CONTROL_READ); 1992 1993 scratch &= ~(0xf << DEFECT7374_FSM_FIELD); 1994 1995 ep_warn(dev, "Operate Defect 7374 workaround soft this time"); 1996 ep_warn(dev, "It will operate on cold-reboot and SS connect"); 1997 1998 /*GPEPs:*/ 1999 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) | 2000 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) | 2001 ((dev->enhanced_mode) ? 2002 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) : 2003 BIT(ENDPOINT_ENABLE))); 2004 2005 for (i = 1; i < 5; i++) 2006 writel(tmp, &dev->ep[i].cfg->ep_cfg); 2007 2008 /* CSRIN, PCIIN, STATIN, RCIN*/ 2009 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE)); 2010 writel(tmp, &dev->dep[1].dep_cfg); 2011 writel(tmp, &dev->dep[3].dep_cfg); 2012 writel(tmp, &dev->dep[4].dep_cfg); 2013 writel(tmp, &dev->dep[5].dep_cfg); 2014 2015 /*Implemented for development and debug. 2016 * Can be refined/tuned later.*/ 2017 for (ep_sel = 0; ep_sel <= 21; ep_sel++) { 2018 /* Select an endpoint for subsequent operations: */ 2019 tmp_reg = readl(&dev->plregs->pl_ep_ctrl); 2020 writel(((tmp_reg & ~0x1f) | ep_sel), 2021 &dev->plregs->pl_ep_ctrl); 2022 2023 if (ep_sel == 1) { 2024 tmp = 2025 (readl(&dev->plregs->pl_ep_ctrl) | 2026 BIT(CLEAR_ACK_ERROR_CODE) | 0); 2027 writel(tmp, &dev->plregs->pl_ep_ctrl); 2028 continue; 2029 } 2030 2031 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) || 2032 ep_sel == 18 || ep_sel == 20) 2033 continue; 2034 2035 tmp = (readl(&dev->plregs->pl_ep_cfg_4) | 2036 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0); 2037 writel(tmp, &dev->plregs->pl_ep_cfg_4); 2038 2039 tmp = readl(&dev->plregs->pl_ep_ctrl) & 2040 ~BIT(EP_INITIALIZED); 2041 writel(tmp, &dev->plregs->pl_ep_ctrl); 2042 2043 } 2044 2045 /* Set FSM to focus on the first Control Read: 2046 * - Tip: Connection speed is known upon the first 2047 * setup request.*/ 2048 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ; 2049 set_idx_reg(dev->regs, SCRATCH, scratch); 2050 2051 } 2052 2053 /* keeping it simple: 2054 * - one bus driver, initted first; 2055 * - one function driver, initted second 2056 * 2057 * most of the work to support multiple net2280 controllers would 2058 * be to associate this gadget driver (yes?) with all of them, or 2059 * perhaps to bind specific drivers to specific devices. 2060 */ 2061 2062 static void usb_reset_228x(struct net2280 *dev) 2063 { 2064 u32 tmp; 2065 2066 dev->gadget.speed = USB_SPEED_UNKNOWN; 2067 (void) readl(&dev->usb->usbctl); 2068 2069 net2280_led_init(dev); 2070 2071 /* disable automatic responses, and irqs */ 2072 writel(0, &dev->usb->stdrsp); 2073 writel(0, &dev->regs->pciirqenb0); 2074 writel(0, &dev->regs->pciirqenb1); 2075 2076 /* clear old dma and irq state */ 2077 for (tmp = 0; tmp < 4; tmp++) { 2078 struct net2280_ep *ep = &dev->ep[tmp + 1]; 2079 if (ep->dma) 2080 abort_dma(ep); 2081 } 2082 2083 writel(~0, &dev->regs->irqstat0), 2084 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), 2085 2086 /* reset, and enable pci */ 2087 tmp = readl(&dev->regs->devinit) | 2088 BIT(PCI_ENABLE) | 2089 BIT(FIFO_SOFT_RESET) | 2090 BIT(USB_SOFT_RESET) | 2091 BIT(M8051_RESET); 2092 writel(tmp, &dev->regs->devinit); 2093 2094 /* standard fifo and endpoint allocations */ 2095 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0); 2096 } 2097 2098 static void usb_reset_338x(struct net2280 *dev) 2099 { 2100 u32 tmp; 2101 2102 dev->gadget.speed = USB_SPEED_UNKNOWN; 2103 (void)readl(&dev->usb->usbctl); 2104 2105 net2280_led_init(dev); 2106 2107 if (dev->bug7734_patched) { 2108 /* disable automatic responses, and irqs */ 2109 writel(0, &dev->usb->stdrsp); 2110 writel(0, &dev->regs->pciirqenb0); 2111 writel(0, &dev->regs->pciirqenb1); 2112 } 2113 2114 /* clear old dma and irq state */ 2115 for (tmp = 0; tmp < 4; tmp++) { 2116 struct net2280_ep *ep = &dev->ep[tmp + 1]; 2117 struct net2280_dma_regs __iomem *dma; 2118 2119 if (ep->dma) { 2120 abort_dma(ep); 2121 } else { 2122 dma = &dev->dma[tmp]; 2123 writel(BIT(DMA_ABORT), &dma->dmastat); 2124 writel(0, &dma->dmactl); 2125 } 2126 } 2127 2128 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1); 2129 2130 if (dev->bug7734_patched) { 2131 /* reset, and enable pci */ 2132 tmp = readl(&dev->regs->devinit) | 2133 BIT(PCI_ENABLE) | 2134 BIT(FIFO_SOFT_RESET) | 2135 BIT(USB_SOFT_RESET) | 2136 BIT(M8051_RESET); 2137 2138 writel(tmp, &dev->regs->devinit); 2139 } 2140 2141 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */ 2142 INIT_LIST_HEAD(&dev->gadget.ep_list); 2143 2144 for (tmp = 1; tmp < dev->n_ep; tmp++) 2145 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list); 2146 2147 } 2148 2149 static void usb_reset(struct net2280 *dev) 2150 { 2151 if (dev->quirks & PLX_LEGACY) 2152 return usb_reset_228x(dev); 2153 return usb_reset_338x(dev); 2154 } 2155 2156 static void usb_reinit_228x(struct net2280 *dev) 2157 { 2158 u32 tmp; 2159 2160 /* basic endpoint init */ 2161 for (tmp = 0; tmp < 7; tmp++) { 2162 struct net2280_ep *ep = &dev->ep[tmp]; 2163 2164 ep->ep.name = ep_info_dft[tmp].name; 2165 ep->ep.caps = ep_info_dft[tmp].caps; 2166 ep->dev = dev; 2167 ep->num = tmp; 2168 2169 if (tmp > 0 && tmp <= 4) { 2170 ep->fifo_size = 1024; 2171 ep->dma = &dev->dma[tmp - 1]; 2172 } else 2173 ep->fifo_size = 64; 2174 ep->regs = &dev->epregs[tmp]; 2175 ep->cfg = &dev->epregs[tmp]; 2176 ep_reset_228x(dev->regs, ep); 2177 } 2178 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64); 2179 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64); 2180 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64); 2181 2182 dev->gadget.ep0 = &dev->ep[0].ep; 2183 dev->ep[0].stopped = 0; 2184 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); 2185 2186 /* we want to prevent lowlevel/insecure access from the USB host, 2187 * but erratum 0119 means this enable bit is ignored 2188 */ 2189 for (tmp = 0; tmp < 5; tmp++) 2190 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg); 2191 } 2192 2193 static void usb_reinit_338x(struct net2280 *dev) 2194 { 2195 int i; 2196 u32 tmp, val; 2197 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 }; 2198 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00, 2199 0x00, 0xC0, 0x00, 0xC0 }; 2200 2201 /* basic endpoint init */ 2202 for (i = 0; i < dev->n_ep; i++) { 2203 struct net2280_ep *ep = &dev->ep[i]; 2204 2205 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name : 2206 ep_info_dft[i].name; 2207 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps : 2208 ep_info_dft[i].caps; 2209 ep->dev = dev; 2210 ep->num = i; 2211 2212 if (i > 0 && i <= 4) 2213 ep->dma = &dev->dma[i - 1]; 2214 2215 if (dev->enhanced_mode) { 2216 ep->cfg = &dev->epregs[ne[i]]; 2217 /* 2218 * Set USB endpoint number, hardware allows same number 2219 * in both directions. 2220 */ 2221 if (i > 0 && i < 5) 2222 writel(ne[i], &ep->cfg->ep_cfg); 2223 ep->regs = (struct net2280_ep_regs __iomem *) 2224 (((void __iomem *)&dev->epregs[ne[i]]) + 2225 ep_reg_addr[i]); 2226 } else { 2227 ep->cfg = &dev->epregs[i]; 2228 ep->regs = &dev->epregs[i]; 2229 } 2230 2231 ep->fifo_size = (i != 0) ? 2048 : 512; 2232 2233 ep_reset_338x(dev->regs, ep); 2234 } 2235 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512); 2236 2237 dev->gadget.ep0 = &dev->ep[0].ep; 2238 dev->ep[0].stopped = 0; 2239 2240 /* Link layer set up */ 2241 if (dev->bug7734_patched) { 2242 tmp = readl(&dev->usb_ext->usbctl2) & 2243 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE)); 2244 writel(tmp, &dev->usb_ext->usbctl2); 2245 } 2246 2247 /* Hardware Defect and Workaround */ 2248 val = readl(&dev->llregs->ll_lfps_5); 2249 val &= ~(0xf << TIMER_LFPS_6US); 2250 val |= 0x5 << TIMER_LFPS_6US; 2251 writel(val, &dev->llregs->ll_lfps_5); 2252 2253 val = readl(&dev->llregs->ll_lfps_6); 2254 val &= ~(0xffff << TIMER_LFPS_80US); 2255 val |= 0x0100 << TIMER_LFPS_80US; 2256 writel(val, &dev->llregs->ll_lfps_6); 2257 2258 /* 2259 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB 2260 * Hot Reset Exit Handshake may Fail in Specific Case using 2261 * Default Register Settings. Workaround for Enumeration test. 2262 */ 2263 val = readl(&dev->llregs->ll_tsn_counters_2); 2264 val &= ~(0x1f << HOT_TX_NORESET_TS2); 2265 val |= 0x10 << HOT_TX_NORESET_TS2; 2266 writel(val, &dev->llregs->ll_tsn_counters_2); 2267 2268 val = readl(&dev->llregs->ll_tsn_counters_3); 2269 val &= ~(0x1f << HOT_RX_RESET_TS2); 2270 val |= 0x3 << HOT_RX_RESET_TS2; 2271 writel(val, &dev->llregs->ll_tsn_counters_3); 2272 2273 /* 2274 * AB errata. Errata 11. Workaround for Default Duration of LFPS 2275 * Handshake Signaling for Device-Initiated U1 Exit is too short. 2276 * Without this, various enumeration failures observed with 2277 * modern superspeed hosts. 2278 */ 2279 val = readl(&dev->llregs->ll_lfps_timers_2); 2280 writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE, 2281 &dev->llregs->ll_lfps_timers_2); 2282 2283 /* 2284 * Set Recovery Idle to Recover bit: 2285 * - On SS connections, setting Recovery Idle to Recover Fmw improves 2286 * link robustness with various hosts and hubs. 2287 * - It is safe to set for all connection speeds; all chip revisions. 2288 * - R-M-W to leave other bits undisturbed. 2289 * - Reference PLX TT-7372 2290 */ 2291 val = readl(&dev->llregs->ll_tsn_chicken_bit); 2292 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW); 2293 writel(val, &dev->llregs->ll_tsn_chicken_bit); 2294 2295 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); 2296 2297 /* disable dedicated endpoints */ 2298 writel(0x0D, &dev->dep[0].dep_cfg); 2299 writel(0x0D, &dev->dep[1].dep_cfg); 2300 writel(0x0E, &dev->dep[2].dep_cfg); 2301 writel(0x0E, &dev->dep[3].dep_cfg); 2302 writel(0x0F, &dev->dep[4].dep_cfg); 2303 writel(0x0C, &dev->dep[5].dep_cfg); 2304 } 2305 2306 static void usb_reinit(struct net2280 *dev) 2307 { 2308 if (dev->quirks & PLX_LEGACY) 2309 return usb_reinit_228x(dev); 2310 return usb_reinit_338x(dev); 2311 } 2312 2313 static void ep0_start_228x(struct net2280 *dev) 2314 { 2315 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) | 2316 BIT(CLEAR_NAK_OUT_PACKETS) | 2317 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), 2318 &dev->epregs[0].ep_rsp); 2319 2320 /* 2321 * hardware optionally handles a bunch of standard requests 2322 * that the API hides from drivers anyway. have it do so. 2323 * endpoint status/features are handled in software, to 2324 * help pass tests for some dubious behavior. 2325 */ 2326 writel(BIT(SET_TEST_MODE) | 2327 BIT(SET_ADDRESS) | 2328 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | 2329 BIT(GET_DEVICE_STATUS) | 2330 BIT(GET_INTERFACE_STATUS), 2331 &dev->usb->stdrsp); 2332 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) | 2333 BIT(SELF_POWERED_USB_DEVICE) | 2334 BIT(REMOTE_WAKEUP_SUPPORT) | 2335 (dev->softconnect << USB_DETECT_ENABLE) | 2336 BIT(SELF_POWERED_STATUS), 2337 &dev->usb->usbctl); 2338 2339 /* enable irqs so we can see ep0 and general operation */ 2340 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) | 2341 BIT(ENDPOINT_0_INTERRUPT_ENABLE), 2342 &dev->regs->pciirqenb0); 2343 writel(BIT(PCI_INTERRUPT_ENABLE) | 2344 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | 2345 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | 2346 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) | 2347 BIT(VBUS_INTERRUPT_ENABLE) | 2348 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) | 2349 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE), 2350 &dev->regs->pciirqenb1); 2351 2352 /* don't leave any writes posted */ 2353 (void) readl(&dev->usb->usbctl); 2354 } 2355 2356 static void ep0_start_338x(struct net2280 *dev) 2357 { 2358 2359 if (dev->bug7734_patched) 2360 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) | 2361 BIT(SET_EP_HIDE_STATUS_PHASE), 2362 &dev->epregs[0].ep_rsp); 2363 2364 /* 2365 * hardware optionally handles a bunch of standard requests 2366 * that the API hides from drivers anyway. have it do so. 2367 * endpoint status/features are handled in software, to 2368 * help pass tests for some dubious behavior. 2369 */ 2370 writel(BIT(SET_ISOCHRONOUS_DELAY) | 2371 BIT(SET_SEL) | 2372 BIT(SET_TEST_MODE) | 2373 BIT(SET_ADDRESS) | 2374 BIT(GET_INTERFACE_STATUS) | 2375 BIT(GET_DEVICE_STATUS), 2376 &dev->usb->stdrsp); 2377 dev->wakeup_enable = 1; 2378 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) | 2379 (dev->softconnect << USB_DETECT_ENABLE) | 2380 BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 2381 &dev->usb->usbctl); 2382 2383 /* enable irqs so we can see ep0 and general operation */ 2384 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) | 2385 BIT(ENDPOINT_0_INTERRUPT_ENABLE), 2386 &dev->regs->pciirqenb0); 2387 writel(BIT(PCI_INTERRUPT_ENABLE) | 2388 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) | 2389 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) | 2390 BIT(VBUS_INTERRUPT_ENABLE), 2391 &dev->regs->pciirqenb1); 2392 2393 /* don't leave any writes posted */ 2394 (void)readl(&dev->usb->usbctl); 2395 } 2396 2397 static void ep0_start(struct net2280 *dev) 2398 { 2399 if (dev->quirks & PLX_LEGACY) 2400 return ep0_start_228x(dev); 2401 return ep0_start_338x(dev); 2402 } 2403 2404 /* when a driver is successfully registered, it will receive 2405 * control requests including set_configuration(), which enables 2406 * non-control requests. then usb traffic follows until a 2407 * disconnect is reported. then a host may connect again, or 2408 * the driver might get unbound. 2409 */ 2410 static int net2280_start(struct usb_gadget *_gadget, 2411 struct usb_gadget_driver *driver) 2412 { 2413 struct net2280 *dev; 2414 int retval; 2415 unsigned i; 2416 2417 /* insist on high speed support from the driver, since 2418 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) 2419 * "must not be used in normal operation" 2420 */ 2421 if (!driver || driver->max_speed < USB_SPEED_HIGH || 2422 !driver->setup) 2423 return -EINVAL; 2424 2425 dev = container_of(_gadget, struct net2280, gadget); 2426 2427 for (i = 0; i < dev->n_ep; i++) 2428 dev->ep[i].irqs = 0; 2429 2430 /* hook up the driver ... */ 2431 driver->driver.bus = NULL; 2432 dev->driver = driver; 2433 2434 retval = device_create_file(&dev->pdev->dev, &dev_attr_function); 2435 if (retval) 2436 goto err_unbind; 2437 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues); 2438 if (retval) 2439 goto err_func; 2440 2441 /* enable host detection and ep0; and we're ready 2442 * for set_configuration as well as eventual disconnect. 2443 */ 2444 net2280_led_active(dev, 1); 2445 2446 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched) 2447 defect7374_enable_data_eps_zero(dev); 2448 2449 ep0_start(dev); 2450 2451 /* pci writes may still be posted */ 2452 return 0; 2453 2454 err_func: 2455 device_remove_file(&dev->pdev->dev, &dev_attr_function); 2456 err_unbind: 2457 dev->driver = NULL; 2458 return retval; 2459 } 2460 2461 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver) 2462 { 2463 int i; 2464 2465 /* don't disconnect if it's not connected */ 2466 if (dev->gadget.speed == USB_SPEED_UNKNOWN) 2467 driver = NULL; 2468 2469 /* stop hardware; prevent new request submissions; 2470 * and kill any outstanding requests. 2471 */ 2472 usb_reset(dev); 2473 for (i = 0; i < dev->n_ep; i++) 2474 nuke(&dev->ep[i]); 2475 2476 /* report disconnect; the driver is already quiesced */ 2477 if (dev->async_callbacks && driver) { 2478 spin_unlock(&dev->lock); 2479 driver->disconnect(&dev->gadget); 2480 spin_lock(&dev->lock); 2481 } 2482 2483 usb_reinit(dev); 2484 } 2485 2486 static int net2280_stop(struct usb_gadget *_gadget) 2487 { 2488 struct net2280 *dev; 2489 unsigned long flags; 2490 2491 dev = container_of(_gadget, struct net2280, gadget); 2492 2493 spin_lock_irqsave(&dev->lock, flags); 2494 stop_activity(dev, NULL); 2495 spin_unlock_irqrestore(&dev->lock, flags); 2496 2497 net2280_led_active(dev, 0); 2498 2499 device_remove_file(&dev->pdev->dev, &dev_attr_function); 2500 device_remove_file(&dev->pdev->dev, &dev_attr_queues); 2501 2502 dev->driver = NULL; 2503 2504 return 0; 2505 } 2506 2507 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable) 2508 { 2509 struct net2280 *dev = container_of(_gadget, struct net2280, gadget); 2510 2511 spin_lock_irq(&dev->lock); 2512 dev->async_callbacks = enable; 2513 spin_unlock_irq(&dev->lock); 2514 } 2515 2516 /*-------------------------------------------------------------------------*/ 2517 2518 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. 2519 * also works for dma-capable endpoints, in pio mode or just 2520 * to manually advance the queue after short OUT transfers. 2521 */ 2522 static void handle_ep_small(struct net2280_ep *ep) 2523 { 2524 struct net2280_request *req; 2525 u32 t; 2526 /* 0 error, 1 mid-data, 2 done */ 2527 int mode = 1; 2528 2529 if (!list_empty(&ep->queue)) 2530 req = list_entry(ep->queue.next, 2531 struct net2280_request, queue); 2532 else 2533 req = NULL; 2534 2535 /* ack all, and handle what we care about */ 2536 t = readl(&ep->regs->ep_stat); 2537 ep->irqs++; 2538 2539 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n", 2540 ep->ep.name, t, req ? &req->req : NULL); 2541 2542 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) 2543 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat); 2544 else 2545 /* Added for 2282 */ 2546 writel(t, &ep->regs->ep_stat); 2547 2548 /* for ep0, monitor token irqs to catch data stage length errors 2549 * and to synchronize on status. 2550 * 2551 * also, to defer reporting of protocol stalls ... here's where 2552 * data or status first appears, handling stalls here should never 2553 * cause trouble on the host side.. 2554 * 2555 * control requests could be slightly faster without token synch for 2556 * status, but status can jam up that way. 2557 */ 2558 if (unlikely(ep->num == 0)) { 2559 if (ep->is_in) { 2560 /* status; stop NAKing */ 2561 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) { 2562 if (ep->dev->protocol_stall) { 2563 ep->stopped = 1; 2564 set_halt(ep); 2565 } 2566 if (!req) 2567 allow_status(ep); 2568 mode = 2; 2569 /* reply to extra IN data tokens with a zlp */ 2570 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) { 2571 if (ep->dev->protocol_stall) { 2572 ep->stopped = 1; 2573 set_halt(ep); 2574 mode = 2; 2575 } else if (ep->responded && 2576 !req && !ep->stopped) 2577 write_fifo(ep, NULL); 2578 } 2579 } else { 2580 /* status; stop NAKing */ 2581 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) { 2582 if (ep->dev->protocol_stall) { 2583 ep->stopped = 1; 2584 set_halt(ep); 2585 } 2586 mode = 2; 2587 /* an extra OUT token is an error */ 2588 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) && 2589 req && 2590 req->req.actual == req->req.length) || 2591 (ep->responded && !req)) { 2592 ep->dev->protocol_stall = 1; 2593 set_halt(ep); 2594 ep->stopped = 1; 2595 if (req) 2596 done(ep, req, -EOVERFLOW); 2597 req = NULL; 2598 } 2599 } 2600 } 2601 2602 if (unlikely(!req)) 2603 return; 2604 2605 /* manual DMA queue advance after short OUT */ 2606 if (likely(ep->dma)) { 2607 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) { 2608 struct net2280_request *stuck_req = NULL; 2609 int stopped = ep->stopped; 2610 int num_completed; 2611 int stuck = 0; 2612 u32 count; 2613 2614 /* TRANSFERRED works around OUT_DONE erratum 0112. 2615 * we expect (N <= maxpacket) bytes; host wrote M. 2616 * iff (M < N) we won't ever see a DMA interrupt. 2617 */ 2618 ep->stopped = 1; 2619 for (count = 0; ; t = readl(&ep->regs->ep_stat)) { 2620 2621 /* any preceding dma transfers must finish. 2622 * dma handles (M >= N), may empty the queue 2623 */ 2624 num_completed = scan_dma_completions(ep); 2625 if (unlikely(list_empty(&ep->queue) || 2626 ep->out_overflow)) { 2627 req = NULL; 2628 break; 2629 } 2630 req = list_entry(ep->queue.next, 2631 struct net2280_request, queue); 2632 2633 /* here either (M < N), a "real" short rx; 2634 * or (M == N) and the queue didn't empty 2635 */ 2636 if (likely(t & BIT(FIFO_EMPTY))) { 2637 count = readl(&ep->dma->dmacount); 2638 count &= DMA_BYTE_COUNT_MASK; 2639 if (readl(&ep->dma->dmadesc) 2640 != req->td_dma) 2641 req = NULL; 2642 break; 2643 } 2644 2645 /* Escape loop if no dma transfers completed 2646 * after few retries. 2647 */ 2648 if (num_completed == 0) { 2649 if (stuck_req == req && 2650 readl(&ep->dma->dmadesc) != 2651 req->td_dma && stuck++ > 5) { 2652 count = readl( 2653 &ep->dma->dmacount); 2654 count &= DMA_BYTE_COUNT_MASK; 2655 req = NULL; 2656 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n", 2657 ep->ep.name, stuck, 2658 count); 2659 break; 2660 } else if (stuck_req != req) { 2661 stuck_req = req; 2662 stuck = 0; 2663 } 2664 } else { 2665 stuck_req = NULL; 2666 stuck = 0; 2667 } 2668 2669 udelay(1); 2670 } 2671 2672 /* stop DMA, leave ep NAKing */ 2673 writel(BIT(DMA_ABORT), &ep->dma->dmastat); 2674 spin_stop_dma(ep->dma); 2675 2676 if (likely(req)) { 2677 req->td->dmacount = 0; 2678 t = readl(&ep->regs->ep_avail); 2679 dma_done(ep, req, count, 2680 (ep->out_overflow || t) 2681 ? -EOVERFLOW : 0); 2682 } 2683 2684 /* also flush to prevent erratum 0106 trouble */ 2685 if (unlikely(ep->out_overflow || 2686 (ep->dev->chiprev == 0x0100 && 2687 ep->dev->gadget.speed 2688 == USB_SPEED_FULL))) { 2689 out_flush(ep); 2690 ep->out_overflow = 0; 2691 } 2692 2693 /* (re)start dma if needed, stop NAKing */ 2694 ep->stopped = stopped; 2695 if (!list_empty(&ep->queue)) 2696 restart_dma(ep); 2697 } else 2698 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n", 2699 ep->ep.name, t); 2700 return; 2701 2702 /* data packet(s) received (in the fifo, OUT) */ 2703 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) { 2704 if (read_fifo(ep, req) && ep->num != 0) 2705 mode = 2; 2706 2707 /* data packet(s) transmitted (IN) */ 2708 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) { 2709 unsigned len; 2710 2711 len = req->req.length - req->req.actual; 2712 if (len > ep->ep.maxpacket) 2713 len = ep->ep.maxpacket; 2714 req->req.actual += len; 2715 2716 /* if we wrote it all, we're usually done */ 2717 /* send zlps until the status stage */ 2718 if ((req->req.actual == req->req.length) && 2719 (!req->req.zero || len != ep->ep.maxpacket) && ep->num) 2720 mode = 2; 2721 2722 /* there was nothing to do ... */ 2723 } else if (mode == 1) 2724 return; 2725 2726 /* done */ 2727 if (mode == 2) { 2728 /* stream endpoints often resubmit/unlink in completion */ 2729 done(ep, req, 0); 2730 2731 /* maybe advance queue to next request */ 2732 if (ep->num == 0) { 2733 /* NOTE: net2280 could let gadget driver start the 2734 * status stage later. since not all controllers let 2735 * them control that, the api doesn't (yet) allow it. 2736 */ 2737 if (!ep->stopped) 2738 allow_status(ep); 2739 req = NULL; 2740 } else { 2741 if (!list_empty(&ep->queue) && !ep->stopped) 2742 req = list_entry(ep->queue.next, 2743 struct net2280_request, queue); 2744 else 2745 req = NULL; 2746 if (req && !ep->is_in) 2747 stop_out_naking(ep); 2748 } 2749 } 2750 2751 /* is there a buffer for the next packet? 2752 * for best streaming performance, make sure there is one. 2753 */ 2754 if (req && !ep->stopped) { 2755 2756 /* load IN fifo with next packet (may be zlp) */ 2757 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) 2758 write_fifo(ep, &req->req); 2759 } 2760 } 2761 2762 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex) 2763 { 2764 struct net2280_ep *ep; 2765 2766 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) 2767 return &dev->ep[0]; 2768 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) { 2769 u8 bEndpointAddress; 2770 2771 if (!ep->desc) 2772 continue; 2773 bEndpointAddress = ep->desc->bEndpointAddress; 2774 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) 2775 continue; 2776 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) 2777 return ep; 2778 } 2779 return NULL; 2780 } 2781 2782 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r) 2783 { 2784 u32 scratch, fsmvalue; 2785 u32 ack_wait_timeout, state; 2786 2787 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */ 2788 scratch = get_idx_reg(dev->regs, SCRATCH); 2789 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD); 2790 scratch &= ~(0xf << DEFECT7374_FSM_FIELD); 2791 2792 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) && 2793 (r.bRequestType & USB_DIR_IN))) 2794 return; 2795 2796 /* This is the first Control Read for this connection: */ 2797 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) { 2798 /* 2799 * Connection is NOT SS: 2800 * - Connection must be FS or HS. 2801 * - This FSM state should allow workaround software to 2802 * run after the next USB connection. 2803 */ 2804 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ; 2805 dev->bug7734_patched = 1; 2806 goto restore_data_eps; 2807 } 2808 2809 /* Connection is SS: */ 2810 for (ack_wait_timeout = 0; 2811 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS; 2812 ack_wait_timeout++) { 2813 2814 state = readl(&dev->plregs->pl_ep_status_1) 2815 & (0xff << STATE); 2816 if ((state >= (ACK_GOOD_NORMAL << STATE)) && 2817 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) { 2818 scratch |= DEFECT7374_FSM_SS_CONTROL_READ; 2819 dev->bug7734_patched = 1; 2820 break; 2821 } 2822 2823 /* 2824 * We have not yet received host's Data Phase ACK 2825 * - Wait and try again. 2826 */ 2827 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME); 2828 } 2829 2830 2831 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) { 2832 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed " 2833 "to detect SS host's data phase ACK."); 2834 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16" 2835 "got 0x%2.2x.\n", state >> STATE); 2836 } else { 2837 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n" 2838 "%duSec for Control Read Data Phase ACK\n", 2839 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout); 2840 } 2841 2842 restore_data_eps: 2843 /* 2844 * Restore data EPs to their pre-workaround settings (disabled, 2845 * initialized, and other details). 2846 */ 2847 defect7374_disable_data_eps(dev); 2848 2849 set_idx_reg(dev->regs, SCRATCH, scratch); 2850 2851 return; 2852 } 2853 2854 static void ep_clear_seqnum(struct net2280_ep *ep) 2855 { 2856 struct net2280 *dev = ep->dev; 2857 u32 val; 2858 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 }; 2859 2860 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f; 2861 val |= ep_pl[ep->num]; 2862 writel(val, &dev->plregs->pl_ep_ctrl); 2863 val |= BIT(SEQUENCE_NUMBER_RESET); 2864 writel(val, &dev->plregs->pl_ep_ctrl); 2865 2866 return; 2867 } 2868 2869 static void handle_stat0_irqs_superspeed(struct net2280 *dev, 2870 struct net2280_ep *ep, struct usb_ctrlrequest r) 2871 { 2872 struct net2280_ep *e; 2873 u16 status; 2874 int tmp = 0; 2875 2876 #define w_value le16_to_cpu(r.wValue) 2877 #define w_index le16_to_cpu(r.wIndex) 2878 #define w_length le16_to_cpu(r.wLength) 2879 2880 switch (r.bRequest) { 2881 case USB_REQ_SET_CONFIGURATION: 2882 dev->addressed_state = !w_value; 2883 goto usb3_delegate; 2884 2885 case USB_REQ_GET_STATUS: 2886 switch (r.bRequestType) { 2887 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2888 status = dev->wakeup_enable ? 0x02 : 0x00; 2889 if (dev->gadget.is_selfpowered) 2890 status |= BIT(0); 2891 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 | 2892 dev->ltm_enable << 4); 2893 writel(0, &dev->epregs[0].ep_irqenb); 2894 set_fifo_bytecount(ep, sizeof(status)); 2895 writel((__force u32) status, &dev->epregs[0].ep_data); 2896 allow_status_338x(ep); 2897 break; 2898 2899 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 2900 e = get_ep_by_addr(dev, w_index); 2901 if (!e) 2902 goto do_stall3; 2903 status = readl(&e->regs->ep_rsp) & 2904 BIT(CLEAR_ENDPOINT_HALT); 2905 writel(0, &dev->epregs[0].ep_irqenb); 2906 set_fifo_bytecount(ep, sizeof(status)); 2907 writel((__force u32) status, &dev->epregs[0].ep_data); 2908 allow_status_338x(ep); 2909 break; 2910 2911 default: 2912 goto usb3_delegate; 2913 } 2914 break; 2915 2916 case USB_REQ_CLEAR_FEATURE: 2917 switch (r.bRequestType) { 2918 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2919 if (!dev->addressed_state) { 2920 switch (w_value) { 2921 case USB_DEVICE_U1_ENABLE: 2922 dev->u1_enable = 0; 2923 writel(readl(&dev->usb_ext->usbctl2) & 2924 ~BIT(U1_ENABLE), 2925 &dev->usb_ext->usbctl2); 2926 allow_status_338x(ep); 2927 goto next_endpoints3; 2928 2929 case USB_DEVICE_U2_ENABLE: 2930 dev->u2_enable = 0; 2931 writel(readl(&dev->usb_ext->usbctl2) & 2932 ~BIT(U2_ENABLE), 2933 &dev->usb_ext->usbctl2); 2934 allow_status_338x(ep); 2935 goto next_endpoints3; 2936 2937 case USB_DEVICE_LTM_ENABLE: 2938 dev->ltm_enable = 0; 2939 writel(readl(&dev->usb_ext->usbctl2) & 2940 ~BIT(LTM_ENABLE), 2941 &dev->usb_ext->usbctl2); 2942 allow_status_338x(ep); 2943 goto next_endpoints3; 2944 2945 default: 2946 break; 2947 } 2948 } 2949 if (w_value == USB_DEVICE_REMOTE_WAKEUP) { 2950 dev->wakeup_enable = 0; 2951 writel(readl(&dev->usb->usbctl) & 2952 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 2953 &dev->usb->usbctl); 2954 allow_status_338x(ep); 2955 break; 2956 } 2957 goto usb3_delegate; 2958 2959 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 2960 e = get_ep_by_addr(dev, w_index); 2961 if (!e) 2962 goto do_stall3; 2963 if (w_value != USB_ENDPOINT_HALT) 2964 goto do_stall3; 2965 ep_vdbg(dev, "%s clear halt\n", e->ep.name); 2966 /* 2967 * Workaround for SS SeqNum not cleared via 2968 * Endpoint Halt (Clear) bit. select endpoint 2969 */ 2970 ep_clear_seqnum(e); 2971 clear_halt(e); 2972 if (!list_empty(&e->queue) && e->td_dma) 2973 restart_dma(e); 2974 allow_status(ep); 2975 ep->stopped = 1; 2976 break; 2977 2978 default: 2979 goto usb3_delegate; 2980 } 2981 break; 2982 case USB_REQ_SET_FEATURE: 2983 switch (r.bRequestType) { 2984 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE): 2985 if (!dev->addressed_state) { 2986 switch (w_value) { 2987 case USB_DEVICE_U1_ENABLE: 2988 dev->u1_enable = 1; 2989 writel(readl(&dev->usb_ext->usbctl2) | 2990 BIT(U1_ENABLE), 2991 &dev->usb_ext->usbctl2); 2992 allow_status_338x(ep); 2993 goto next_endpoints3; 2994 2995 case USB_DEVICE_U2_ENABLE: 2996 dev->u2_enable = 1; 2997 writel(readl(&dev->usb_ext->usbctl2) | 2998 BIT(U2_ENABLE), 2999 &dev->usb_ext->usbctl2); 3000 allow_status_338x(ep); 3001 goto next_endpoints3; 3002 3003 case USB_DEVICE_LTM_ENABLE: 3004 dev->ltm_enable = 1; 3005 writel(readl(&dev->usb_ext->usbctl2) | 3006 BIT(LTM_ENABLE), 3007 &dev->usb_ext->usbctl2); 3008 allow_status_338x(ep); 3009 goto next_endpoints3; 3010 default: 3011 break; 3012 } 3013 } 3014 3015 if (w_value == USB_DEVICE_REMOTE_WAKEUP) { 3016 dev->wakeup_enable = 1; 3017 writel(readl(&dev->usb->usbctl) | 3018 BIT(DEVICE_REMOTE_WAKEUP_ENABLE), 3019 &dev->usb->usbctl); 3020 allow_status_338x(ep); 3021 break; 3022 } 3023 goto usb3_delegate; 3024 3025 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT): 3026 e = get_ep_by_addr(dev, w_index); 3027 if (!e || (w_value != USB_ENDPOINT_HALT)) 3028 goto do_stall3; 3029 ep->stopped = 1; 3030 if (ep->num == 0) 3031 ep->dev->protocol_stall = 1; 3032 else { 3033 if (ep->dma) 3034 abort_dma(ep); 3035 set_halt(ep); 3036 } 3037 allow_status_338x(ep); 3038 break; 3039 3040 default: 3041 goto usb3_delegate; 3042 } 3043 3044 break; 3045 default: 3046 3047 usb3_delegate: 3048 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n", 3049 r.bRequestType, r.bRequest, 3050 w_value, w_index, w_length, 3051 readl(&ep->cfg->ep_cfg)); 3052 3053 ep->responded = 0; 3054 if (dev->async_callbacks) { 3055 spin_unlock(&dev->lock); 3056 tmp = dev->driver->setup(&dev->gadget, &r); 3057 spin_lock(&dev->lock); 3058 } 3059 } 3060 do_stall3: 3061 if (tmp < 0) { 3062 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n", 3063 r.bRequestType, r.bRequest, tmp); 3064 dev->protocol_stall = 1; 3065 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */ 3066 set_halt(ep); 3067 } 3068 3069 next_endpoints3: 3070 3071 #undef w_value 3072 #undef w_index 3073 #undef w_length 3074 3075 return; 3076 } 3077 3078 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0) 3079 { 3080 u32 index; 3081 u32 bit; 3082 3083 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) { 3084 bit = BIT(ep_bit[index]); 3085 3086 if (!stat0) 3087 break; 3088 3089 if (!(stat0 & bit)) 3090 continue; 3091 3092 stat0 &= ~bit; 3093 3094 handle_ep_small(&dev->ep[index]); 3095 } 3096 } 3097 3098 static void handle_stat0_irqs(struct net2280 *dev, u32 stat) 3099 { 3100 struct net2280_ep *ep; 3101 u32 num, scratch; 3102 3103 /* most of these don't need individual acks */ 3104 stat &= ~BIT(INTA_ASSERTED); 3105 if (!stat) 3106 return; 3107 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */ 3108 3109 /* starting a control request? */ 3110 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) { 3111 union { 3112 u32 raw[2]; 3113 struct usb_ctrlrequest r; 3114 } u; 3115 int tmp; 3116 struct net2280_request *req; 3117 3118 if (dev->gadget.speed == USB_SPEED_UNKNOWN) { 3119 u32 val = readl(&dev->usb->usbstat); 3120 if (val & BIT(SUPER_SPEED)) { 3121 dev->gadget.speed = USB_SPEED_SUPER; 3122 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3123 EP0_SS_MAX_PACKET_SIZE); 3124 } else if (val & BIT(HIGH_SPEED)) { 3125 dev->gadget.speed = USB_SPEED_HIGH; 3126 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3127 EP0_HS_MAX_PACKET_SIZE); 3128 } else { 3129 dev->gadget.speed = USB_SPEED_FULL; 3130 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 3131 EP0_HS_MAX_PACKET_SIZE); 3132 } 3133 net2280_led_speed(dev, dev->gadget.speed); 3134 ep_dbg(dev, "%s\n", 3135 usb_speed_string(dev->gadget.speed)); 3136 } 3137 3138 ep = &dev->ep[0]; 3139 ep->irqs++; 3140 3141 /* make sure any leftover request state is cleared */ 3142 stat &= ~BIT(ENDPOINT_0_INTERRUPT); 3143 while (!list_empty(&ep->queue)) { 3144 req = list_entry(ep->queue.next, 3145 struct net2280_request, queue); 3146 done(ep, req, (req->req.actual == req->req.length) 3147 ? 0 : -EPROTO); 3148 } 3149 ep->stopped = 0; 3150 dev->protocol_stall = 0; 3151 if (!(dev->quirks & PLX_PCIE)) { 3152 if (ep->dev->quirks & PLX_2280) 3153 tmp = BIT(FIFO_OVERFLOW) | 3154 BIT(FIFO_UNDERFLOW); 3155 else 3156 tmp = 0; 3157 3158 writel(tmp | BIT(TIMEOUT) | 3159 BIT(USB_STALL_SENT) | 3160 BIT(USB_IN_NAK_SENT) | 3161 BIT(USB_IN_ACK_RCVD) | 3162 BIT(USB_OUT_PING_NAK_SENT) | 3163 BIT(USB_OUT_ACK_SENT) | 3164 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) | 3165 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) | 3166 BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 3167 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 3168 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3169 BIT(DATA_IN_TOKEN_INTERRUPT), 3170 &ep->regs->ep_stat); 3171 } 3172 u.raw[0] = readl(&dev->usb->setup0123); 3173 u.raw[1] = readl(&dev->usb->setup4567); 3174 3175 cpu_to_le32s(&u.raw[0]); 3176 cpu_to_le32s(&u.raw[1]); 3177 3178 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched) 3179 defect7374_workaround(dev, u.r); 3180 3181 tmp = 0; 3182 3183 #define w_value le16_to_cpu(u.r.wValue) 3184 #define w_index le16_to_cpu(u.r.wIndex) 3185 #define w_length le16_to_cpu(u.r.wLength) 3186 3187 /* ack the irq */ 3188 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0); 3189 stat ^= BIT(SETUP_PACKET_INTERRUPT); 3190 3191 /* watch control traffic at the token level, and force 3192 * synchronization before letting the status stage happen. 3193 * FIXME ignore tokens we'll NAK, until driver responds. 3194 * that'll mean a lot less irqs for some drivers. 3195 */ 3196 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; 3197 if (ep->is_in) { 3198 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) | 3199 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3200 BIT(DATA_IN_TOKEN_INTERRUPT); 3201 stop_out_naking(ep); 3202 } else 3203 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) | 3204 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) | 3205 BIT(DATA_IN_TOKEN_INTERRUPT); 3206 writel(scratch, &dev->epregs[0].ep_irqenb); 3207 3208 /* we made the hardware handle most lowlevel requests; 3209 * everything else goes uplevel to the gadget code. 3210 */ 3211 ep->responded = 1; 3212 3213 if (dev->gadget.speed == USB_SPEED_SUPER) { 3214 handle_stat0_irqs_superspeed(dev, ep, u.r); 3215 goto next_endpoints; 3216 } 3217 3218 switch (u.r.bRequest) { 3219 case USB_REQ_GET_STATUS: { 3220 struct net2280_ep *e; 3221 __le32 status; 3222 3223 /* hw handles device and interface status */ 3224 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) 3225 goto delegate; 3226 e = get_ep_by_addr(dev, w_index); 3227 if (!e || w_length > 2) 3228 goto do_stall; 3229 3230 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT)) 3231 status = cpu_to_le32(1); 3232 else 3233 status = cpu_to_le32(0); 3234 3235 /* don't bother with a request object! */ 3236 writel(0, &dev->epregs[0].ep_irqenb); 3237 set_fifo_bytecount(ep, w_length); 3238 writel((__force u32)status, &dev->epregs[0].ep_data); 3239 allow_status(ep); 3240 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status); 3241 goto next_endpoints; 3242 } 3243 break; 3244 case USB_REQ_CLEAR_FEATURE: { 3245 struct net2280_ep *e; 3246 3247 /* hw handles device features */ 3248 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 3249 goto delegate; 3250 if (w_value != USB_ENDPOINT_HALT || w_length != 0) 3251 goto do_stall; 3252 e = get_ep_by_addr(dev, w_index); 3253 if (!e) 3254 goto do_stall; 3255 if (e->wedged) { 3256 ep_vdbg(dev, "%s wedged, halt not cleared\n", 3257 ep->ep.name); 3258 } else { 3259 ep_vdbg(dev, "%s clear halt\n", e->ep.name); 3260 clear_halt(e); 3261 if ((ep->dev->quirks & PLX_PCIE) && 3262 !list_empty(&e->queue) && e->td_dma) 3263 restart_dma(e); 3264 } 3265 allow_status(ep); 3266 goto next_endpoints; 3267 } 3268 break; 3269 case USB_REQ_SET_FEATURE: { 3270 struct net2280_ep *e; 3271 3272 /* hw handles device features */ 3273 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 3274 goto delegate; 3275 if (w_value != USB_ENDPOINT_HALT || w_length != 0) 3276 goto do_stall; 3277 e = get_ep_by_addr(dev, w_index); 3278 if (!e) 3279 goto do_stall; 3280 if (e->ep.name == ep0name) 3281 goto do_stall; 3282 set_halt(e); 3283 if ((dev->quirks & PLX_PCIE) && e->dma) 3284 abort_dma(e); 3285 allow_status(ep); 3286 ep_vdbg(dev, "%s set halt\n", ep->ep.name); 3287 goto next_endpoints; 3288 } 3289 break; 3290 default: 3291 delegate: 3292 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x " 3293 "ep_cfg %08x\n", 3294 u.r.bRequestType, u.r.bRequest, 3295 w_value, w_index, w_length, 3296 readl(&ep->cfg->ep_cfg)); 3297 ep->responded = 0; 3298 if (dev->async_callbacks) { 3299 spin_unlock(&dev->lock); 3300 tmp = dev->driver->setup(&dev->gadget, &u.r); 3301 spin_lock(&dev->lock); 3302 } 3303 } 3304 3305 /* stall ep0 on error */ 3306 if (tmp < 0) { 3307 do_stall: 3308 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n", 3309 u.r.bRequestType, u.r.bRequest, tmp); 3310 dev->protocol_stall = 1; 3311 } 3312 3313 /* some in/out token irq should follow; maybe stall then. 3314 * driver must queue a request (even zlp) or halt ep0 3315 * before the host times out. 3316 */ 3317 } 3318 3319 #undef w_value 3320 #undef w_index 3321 #undef w_length 3322 3323 next_endpoints: 3324 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) { 3325 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) | 3326 USB3380_IRQSTAT0_EP_INTR_MASK_IN | 3327 USB3380_IRQSTAT0_EP_INTR_MASK_OUT); 3328 3329 if (stat & mask) { 3330 usb338x_handle_ep_intr(dev, stat & mask); 3331 stat &= ~mask; 3332 } 3333 } else { 3334 /* endpoint data irq ? */ 3335 scratch = stat & 0x7f; 3336 stat &= ~0x7f; 3337 for (num = 0; scratch; num++) { 3338 u32 t; 3339 3340 /* do this endpoint's FIFO and queue need tending? */ 3341 t = BIT(num); 3342 if ((scratch & t) == 0) 3343 continue; 3344 scratch ^= t; 3345 3346 ep = &dev->ep[num]; 3347 handle_ep_small(ep); 3348 } 3349 } 3350 3351 if (stat) 3352 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat); 3353 } 3354 3355 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \ 3356 BIT(DMA_C_INTERRUPT) | \ 3357 BIT(DMA_B_INTERRUPT) | \ 3358 BIT(DMA_A_INTERRUPT)) 3359 #define PCI_ERROR_INTERRUPTS ( \ 3360 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \ 3361 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \ 3362 BIT(PCI_RETRY_ABORT_INTERRUPT)) 3363 3364 static void handle_stat1_irqs(struct net2280 *dev, u32 stat) 3365 __releases(dev->lock) 3366 __acquires(dev->lock) 3367 { 3368 struct net2280_ep *ep; 3369 u32 tmp, num, mask, scratch; 3370 3371 /* after disconnect there's nothing else to do! */ 3372 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT); 3373 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED); 3374 3375 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. 3376 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and 3377 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT 3378 * only indicates a change in the reset state). 3379 */ 3380 if (stat & tmp) { 3381 bool reset = false; 3382 bool disconnect = false; 3383 3384 /* 3385 * Ignore disconnects and resets if the speed hasn't been set. 3386 * VBUS can bounce and there's always an initial reset. 3387 */ 3388 writel(tmp, &dev->regs->irqstat1); 3389 if (dev->gadget.speed != USB_SPEED_UNKNOWN) { 3390 if ((stat & BIT(VBUS_INTERRUPT)) && 3391 (readl(&dev->usb->usbctl) & 3392 BIT(VBUS_PIN)) == 0) { 3393 disconnect = true; 3394 ep_dbg(dev, "disconnect %s\n", 3395 dev->driver->driver.name); 3396 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) && 3397 (readl(&dev->usb->usbstat) & mask) 3398 == 0) { 3399 reset = true; 3400 ep_dbg(dev, "reset %s\n", 3401 dev->driver->driver.name); 3402 } 3403 3404 if (disconnect || reset) { 3405 stop_activity(dev, dev->driver); 3406 ep0_start(dev); 3407 if (dev->async_callbacks) { 3408 spin_unlock(&dev->lock); 3409 if (reset) 3410 usb_gadget_udc_reset(&dev->gadget, dev->driver); 3411 else 3412 (dev->driver->disconnect)(&dev->gadget); 3413 spin_lock(&dev->lock); 3414 } 3415 return; 3416 } 3417 } 3418 stat &= ~tmp; 3419 3420 /* vBUS can bounce ... one of many reasons to ignore the 3421 * notion of hotplug events on bus connect/disconnect! 3422 */ 3423 if (!stat) 3424 return; 3425 } 3426 3427 /* NOTE: chip stays in PCI D0 state for now, but it could 3428 * enter D1 to save more power 3429 */ 3430 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT); 3431 if (stat & tmp) { 3432 writel(tmp, &dev->regs->irqstat1); 3433 spin_unlock(&dev->lock); 3434 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) { 3435 if (dev->async_callbacks && dev->driver->suspend) 3436 dev->driver->suspend(&dev->gadget); 3437 if (!enable_suspend) 3438 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT); 3439 } else { 3440 if (dev->async_callbacks && dev->driver->resume) 3441 dev->driver->resume(&dev->gadget); 3442 /* at high speed, note erratum 0133 */ 3443 } 3444 spin_lock(&dev->lock); 3445 stat &= ~tmp; 3446 } 3447 3448 /* clear any other status/irqs */ 3449 if (stat) 3450 writel(stat, &dev->regs->irqstat1); 3451 3452 /* some status we can just ignore */ 3453 if (dev->quirks & PLX_2280) 3454 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) | 3455 BIT(SUSPEND_REQUEST_INTERRUPT) | 3456 BIT(RESUME_INTERRUPT) | 3457 BIT(SOF_INTERRUPT)); 3458 else 3459 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) | 3460 BIT(RESUME_INTERRUPT) | 3461 BIT(SOF_DOWN_INTERRUPT) | 3462 BIT(SOF_INTERRUPT)); 3463 3464 if (!stat) 3465 return; 3466 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/ 3467 3468 /* DMA status, for ep-{a,b,c,d} */ 3469 scratch = stat & DMA_INTERRUPTS; 3470 stat &= ~DMA_INTERRUPTS; 3471 scratch >>= 9; 3472 for (num = 0; scratch; num++) { 3473 struct net2280_dma_regs __iomem *dma; 3474 3475 tmp = BIT(num); 3476 if ((tmp & scratch) == 0) 3477 continue; 3478 scratch ^= tmp; 3479 3480 ep = &dev->ep[num + 1]; 3481 dma = ep->dma; 3482 3483 if (!dma) 3484 continue; 3485 3486 /* clear ep's dma status */ 3487 tmp = readl(&dma->dmastat); 3488 writel(tmp, &dma->dmastat); 3489 3490 /* dma sync*/ 3491 if (dev->quirks & PLX_PCIE) { 3492 u32 r_dmacount = readl(&dma->dmacount); 3493 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) && 3494 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) 3495 continue; 3496 } 3497 3498 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) { 3499 ep_dbg(ep->dev, "%s no xact done? %08x\n", 3500 ep->ep.name, tmp); 3501 continue; 3502 } 3503 stop_dma(ep->dma); 3504 3505 /* OUT transfers terminate when the data from the 3506 * host is in our memory. Process whatever's done. 3507 * On this path, we know transfer's last packet wasn't 3508 * less than req->length. NAK_OUT_PACKETS may be set, 3509 * or the FIFO may already be holding new packets. 3510 * 3511 * IN transfers can linger in the FIFO for a very 3512 * long time ... we ignore that for now, accounting 3513 * precisely (like PIO does) needs per-packet irqs 3514 */ 3515 scan_dma_completions(ep); 3516 3517 /* disable dma on inactive queues; else maybe restart */ 3518 if (!list_empty(&ep->queue)) { 3519 tmp = readl(&dma->dmactl); 3520 restart_dma(ep); 3521 } 3522 ep->irqs++; 3523 } 3524 3525 /* NOTE: there are other PCI errors we might usefully notice. 3526 * if they appear very often, here's where to try recovering. 3527 */ 3528 if (stat & PCI_ERROR_INTERRUPTS) { 3529 ep_err(dev, "pci dma error; stat %08x\n", stat); 3530 stat &= ~PCI_ERROR_INTERRUPTS; 3531 /* these are fatal errors, but "maybe" they won't 3532 * happen again ... 3533 */ 3534 stop_activity(dev, dev->driver); 3535 ep0_start(dev); 3536 stat = 0; 3537 } 3538 3539 if (stat) 3540 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat); 3541 } 3542 3543 static irqreturn_t net2280_irq(int irq, void *_dev) 3544 { 3545 struct net2280 *dev = _dev; 3546 3547 /* shared interrupt, not ours */ 3548 if ((dev->quirks & PLX_LEGACY) && 3549 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED)))) 3550 return IRQ_NONE; 3551 3552 spin_lock(&dev->lock); 3553 3554 /* handle disconnect, dma, and more */ 3555 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1)); 3556 3557 /* control requests and PIO */ 3558 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0)); 3559 3560 if (dev->quirks & PLX_PCIE) { 3561 /* re-enable interrupt to trigger any possible new interrupt */ 3562 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1); 3563 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1); 3564 writel(pciirqenb1, &dev->regs->pciirqenb1); 3565 } 3566 3567 spin_unlock(&dev->lock); 3568 3569 return IRQ_HANDLED; 3570 } 3571 3572 /*-------------------------------------------------------------------------*/ 3573 3574 static void gadget_release(struct device *_dev) 3575 { 3576 struct net2280 *dev = container_of(_dev, struct net2280, gadget.dev); 3577 3578 kfree(dev); 3579 } 3580 3581 /* tear down the binding between this driver and the pci device */ 3582 3583 static void net2280_remove(struct pci_dev *pdev) 3584 { 3585 struct net2280 *dev = pci_get_drvdata(pdev); 3586 3587 if (dev->added) 3588 usb_del_gadget(&dev->gadget); 3589 3590 BUG_ON(dev->driver); 3591 3592 /* then clean up the resources we allocated during probe() */ 3593 if (dev->requests) { 3594 int i; 3595 for (i = 1; i < 5; i++) { 3596 if (!dev->ep[i].dummy) 3597 continue; 3598 dma_pool_free(dev->requests, dev->ep[i].dummy, 3599 dev->ep[i].td_dma); 3600 } 3601 dma_pool_destroy(dev->requests); 3602 } 3603 if (dev->got_irq) 3604 free_irq(pdev->irq, dev); 3605 if (dev->quirks & PLX_PCIE) 3606 pci_disable_msi(pdev); 3607 if (dev->regs) { 3608 net2280_led_shutdown(dev); 3609 iounmap(dev->regs); 3610 } 3611 if (dev->region) 3612 release_mem_region(pci_resource_start(pdev, 0), 3613 pci_resource_len(pdev, 0)); 3614 if (dev->enabled) 3615 pci_disable_device(pdev); 3616 device_remove_file(&pdev->dev, &dev_attr_registers); 3617 3618 ep_info(dev, "unbind\n"); 3619 usb_put_gadget(&dev->gadget); 3620 } 3621 3622 /* wrap this driver around the specified device, but 3623 * don't respond over USB until a gadget driver binds to us. 3624 */ 3625 3626 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id) 3627 { 3628 struct net2280 *dev; 3629 unsigned long resource, len; 3630 void __iomem *base = NULL; 3631 int retval, i; 3632 3633 /* alloc, and start init */ 3634 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 3635 if (dev == NULL) { 3636 retval = -ENOMEM; 3637 goto done; 3638 } 3639 3640 pci_set_drvdata(pdev, dev); 3641 usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release); 3642 spin_lock_init(&dev->lock); 3643 dev->quirks = id->driver_data; 3644 dev->pdev = pdev; 3645 dev->gadget.ops = &net2280_ops; 3646 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ? 3647 USB_SPEED_SUPER : USB_SPEED_HIGH; 3648 3649 /* the "gadget" abstracts/virtualizes the controller */ 3650 dev->gadget.name = driver_name; 3651 3652 /* now all the pci goodies ... */ 3653 if (pci_enable_device(pdev) < 0) { 3654 retval = -ENODEV; 3655 goto done; 3656 } 3657 dev->enabled = 1; 3658 3659 /* BAR 0 holds all the registers 3660 * BAR 1 is 8051 memory; unused here (note erratum 0103) 3661 * BAR 2 is fifo memory; unused here 3662 */ 3663 resource = pci_resource_start(pdev, 0); 3664 len = pci_resource_len(pdev, 0); 3665 if (!request_mem_region(resource, len, driver_name)) { 3666 ep_dbg(dev, "controller already in use\n"); 3667 retval = -EBUSY; 3668 goto done; 3669 } 3670 dev->region = 1; 3671 3672 /* FIXME provide firmware download interface to put 3673 * 8051 code into the chip, e.g. to turn on PCI PM. 3674 */ 3675 3676 base = ioremap(resource, len); 3677 if (base == NULL) { 3678 ep_dbg(dev, "can't map memory\n"); 3679 retval = -EFAULT; 3680 goto done; 3681 } 3682 dev->regs = (struct net2280_regs __iomem *) base; 3683 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); 3684 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); 3685 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); 3686 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); 3687 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); 3688 3689 if (dev->quirks & PLX_PCIE) { 3690 u32 fsmvalue; 3691 u32 usbstat; 3692 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *) 3693 (base + 0x00b4); 3694 dev->llregs = (struct usb338x_ll_regs __iomem *) 3695 (base + 0x0700); 3696 dev->plregs = (struct usb338x_pl_regs __iomem *) 3697 (base + 0x0800); 3698 usbstat = readl(&dev->usb->usbstat); 3699 dev->enhanced_mode = !!(usbstat & BIT(11)); 3700 dev->n_ep = (dev->enhanced_mode) ? 9 : 5; 3701 /* put into initial config, link up all endpoints */ 3702 fsmvalue = get_idx_reg(dev->regs, SCRATCH) & 3703 (0xf << DEFECT7374_FSM_FIELD); 3704 /* See if firmware needs to set up for workaround: */ 3705 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) { 3706 dev->bug7734_patched = 1; 3707 writel(0, &dev->usb->usbctl); 3708 } else 3709 dev->bug7734_patched = 0; 3710 } else { 3711 dev->enhanced_mode = 0; 3712 dev->n_ep = 7; 3713 /* put into initial config, link up all endpoints */ 3714 writel(0, &dev->usb->usbctl); 3715 } 3716 3717 usb_reset(dev); 3718 usb_reinit(dev); 3719 3720 /* irq setup after old hardware is cleaned up */ 3721 if (!pdev->irq) { 3722 ep_err(dev, "No IRQ. Check PCI setup!\n"); 3723 retval = -ENODEV; 3724 goto done; 3725 } 3726 3727 if (dev->quirks & PLX_PCIE) 3728 if (pci_enable_msi(pdev)) 3729 ep_err(dev, "Failed to enable MSI mode\n"); 3730 3731 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED, 3732 driver_name, dev)) { 3733 ep_err(dev, "request interrupt %d failed\n", pdev->irq); 3734 retval = -EBUSY; 3735 goto done; 3736 } 3737 dev->got_irq = 1; 3738 3739 /* DMA setup */ 3740 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ 3741 dev->requests = dma_pool_create("requests", &pdev->dev, 3742 sizeof(struct net2280_dma), 3743 0 /* no alignment requirements */, 3744 0 /* or page-crossing issues */); 3745 if (!dev->requests) { 3746 ep_dbg(dev, "can't get request pool\n"); 3747 retval = -ENOMEM; 3748 goto done; 3749 } 3750 for (i = 1; i < 5; i++) { 3751 struct net2280_dma *td; 3752 3753 td = dma_pool_alloc(dev->requests, GFP_KERNEL, 3754 &dev->ep[i].td_dma); 3755 if (!td) { 3756 ep_dbg(dev, "can't get dummy %d\n", i); 3757 retval = -ENOMEM; 3758 goto done; 3759 } 3760 td->dmacount = 0; /* not VALID */ 3761 td->dmadesc = td->dmaaddr; 3762 dev->ep[i].dummy = td; 3763 } 3764 3765 /* enable lower-overhead pci memory bursts during DMA */ 3766 if (dev->quirks & PLX_LEGACY) 3767 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) | 3768 /* 3769 * 256 write retries may not be enough... 3770 BIT(PCI_RETRY_ABORT_ENABLE) | 3771 */ 3772 BIT(DMA_READ_MULTIPLE_ENABLE) | 3773 BIT(DMA_READ_LINE_ENABLE), 3774 &dev->pci->pcimstctl); 3775 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ 3776 pci_set_master(pdev); 3777 pci_try_set_mwi(pdev); 3778 3779 /* ... also flushes any posted pci writes */ 3780 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff; 3781 3782 /* done */ 3783 ep_info(dev, "%s\n", driver_desc); 3784 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n", 3785 pdev->irq, base, dev->chiprev); 3786 ep_info(dev, "version: " DRIVER_VERSION "; %s\n", 3787 dev->enhanced_mode ? "enhanced mode" : "legacy mode"); 3788 retval = device_create_file(&pdev->dev, &dev_attr_registers); 3789 if (retval) 3790 goto done; 3791 3792 retval = usb_add_gadget(&dev->gadget); 3793 if (retval) 3794 goto done; 3795 dev->added = 1; 3796 return 0; 3797 3798 done: 3799 if (dev) { 3800 net2280_remove(pdev); 3801 kfree(dev); 3802 } 3803 return retval; 3804 } 3805 3806 /* make sure the board is quiescent; otherwise it will continue 3807 * generating IRQs across the upcoming reboot. 3808 */ 3809 3810 static void net2280_shutdown(struct pci_dev *pdev) 3811 { 3812 struct net2280 *dev = pci_get_drvdata(pdev); 3813 3814 /* disable IRQs */ 3815 writel(0, &dev->regs->pciirqenb0); 3816 writel(0, &dev->regs->pciirqenb1); 3817 3818 /* disable the pullup so the host will think we're gone */ 3819 writel(0, &dev->usb->usbctl); 3820 3821 } 3822 3823 3824 /*-------------------------------------------------------------------------*/ 3825 3826 static const struct pci_device_id pci_ids[] = { { 3827 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3828 .class_mask = ~0, 3829 .vendor = PCI_VENDOR_ID_PLX_LEGACY, 3830 .device = 0x2280, 3831 .subvendor = PCI_ANY_ID, 3832 .subdevice = PCI_ANY_ID, 3833 .driver_data = PLX_LEGACY | PLX_2280, 3834 }, { 3835 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3836 .class_mask = ~0, 3837 .vendor = PCI_VENDOR_ID_PLX_LEGACY, 3838 .device = 0x2282, 3839 .subvendor = PCI_ANY_ID, 3840 .subdevice = PCI_ANY_ID, 3841 .driver_data = PLX_LEGACY, 3842 }, 3843 { 3844 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3845 .class_mask = ~0, 3846 .vendor = PCI_VENDOR_ID_PLX, 3847 .device = 0x2380, 3848 .subvendor = PCI_ANY_ID, 3849 .subdevice = PCI_ANY_ID, 3850 .driver_data = PLX_PCIE, 3851 }, 3852 { 3853 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), 3854 .class_mask = ~0, 3855 .vendor = PCI_VENDOR_ID_PLX, 3856 .device = 0x3380, 3857 .subvendor = PCI_ANY_ID, 3858 .subdevice = PCI_ANY_ID, 3859 .driver_data = PLX_PCIE | PLX_SUPERSPEED, 3860 }, 3861 { 3862 .class = PCI_CLASS_SERIAL_USB_DEVICE, 3863 .class_mask = ~0, 3864 .vendor = PCI_VENDOR_ID_PLX, 3865 .device = 0x3382, 3866 .subvendor = PCI_ANY_ID, 3867 .subdevice = PCI_ANY_ID, 3868 .driver_data = PLX_PCIE | PLX_SUPERSPEED, 3869 }, 3870 { /* end: all zeroes */ } 3871 }; 3872 MODULE_DEVICE_TABLE(pci, pci_ids); 3873 3874 /* pci driver glue; this is a "new style" PCI driver module */ 3875 static struct pci_driver net2280_pci_driver = { 3876 .name = driver_name, 3877 .id_table = pci_ids, 3878 3879 .probe = net2280_probe, 3880 .remove = net2280_remove, 3881 .shutdown = net2280_shutdown, 3882 3883 /* FIXME add power management support */ 3884 }; 3885 3886 module_pci_driver(net2280_pci_driver); 3887 3888 MODULE_DESCRIPTION(DRIVER_DESC); 3889 MODULE_AUTHOR("David Brownell"); 3890 MODULE_LICENSE("GPL"); 3891