root/drivers/usb/gadget/udc/net2280.c

DEFINITIONS

1. type_string
2. enable_pciirqenb
3. net2280_enable
4. handshake
5. ep_reset_228x
6. ep_reset_338x
7. net2280_disable
8. net2280_alloc_request
9. net2280_free_request
10. write_fifo
11. out_flush
12. read_fifo
13. fill_dma_desc
14. BIT
15. stop_dma
16. start_queue
17. start_dma
18. queue_dma
19. done
20. net2280_queue
21. dma_done
22. scan_dma_completions
23. restart_dma
24. abort_dma
25. nuke
26. net2280_dequeue
27. net2280_set_halt_and_wedge
28. net2280_set_halt
29. net2280_set_wedge
30. net2280_fifo_status
31. net2280_fifo_flush
32. net2280_get_frame
33. net2280_wakeup
34. net2280_set_selfpowered
35. net2280_pullup
36. net2280_match_ep
37. function_show
38. registers_show
39. queues_show
40. set_fifo_mode
41. defect7374_disable_data_eps
42. defect7374_enable_data_eps_zero
43. usb_reset_228x
44. usb_reset_338x
45. usb_reset
46. usb_reinit_228x
47. usb_reinit_338x
48. usb_reinit
49. ep0_start_228x
50. ep0_start_338x
51. ep0_start
52. net2280_start
53. stop_activity
54. net2280_stop
55. handle_ep_small
56. get_ep_by_addr
57. defect7374_workaround
58. ep_clear_seqnum
59. handle_stat0_irqs_superspeed
60. usb338x_handle_ep_intr
61. handle_stat0_irqs
62. handle_stat1_irqs
63. net2280_irq
64. gadget_release
65. net2280_remove
66. net2280_probe
67. net2280_shutdown

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