common/usb_hub.c

   1 /*
   2  * Most of this source has been derived from the Linux USB
   3  * project:
   4  * (C) Copyright Linus Torvalds 1999
   5  * (C) Copyright Johannes Erdfelt 1999-2001
   6  * (C) Copyright Andreas Gal 1999
   7  * (C) Copyright Gregory P. Smith 1999
   8  * (C) Copyright Deti Fliegl 1999 (new USB architecture)
   9  * (C) Copyright Randy Dunlap 2000
  10  * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
  11  * (C) Copyright Yggdrasil Computing, Inc. 2000
  12  *     (usb_device_id matching changes by Adam J. Richter)
  13  *
  14  * Adapted for U-Boot:
  15  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
  16  *
  17  * SPDX-License-Identifier:     GPL-2.0+
  18  */
  19
  20 /****************************************************************************
  21  * HUB "Driver"
  22  * Probes device for being a hub and configurate it
  23  */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <dm.h>
  28 #include <errno.h>
  29 #include <memalign.h>
  30 #include <asm/processor.h>
  31 #include <asm/unaligned.h>
  32 #include <linux/ctype.h>
  33 #include <asm/byteorder.h>
  34 #include <asm/unaligned.h>
  35 #include <dm/root.h>
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 #include <usb.h>
  40 #ifdef CONFIG_4xx
  41 #include <asm/4xx_pci.h>
  42 #endif
  43
  44 #define USB_BUFSIZ      512
  45
  46 /* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
  47 static struct usb_hub_device hub_dev[USB_MAX_HUB];
  48 static int usb_hub_index;
  49
  50 __weak void usb_hub_reset_devices(int port)
  51 {
  52         return;
  53 }
  54
  55 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
  56 {
  57         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  58                 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  59                 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
  60 }
  61
  62 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
  63 {
  64         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  65                                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
  66                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  67 }
  68
  69 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
  70 {
  71         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  72                                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
  73                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  74 }
  75
  76 static int usb_get_hub_status(struct usb_device *dev, void *data)
  77 {
  78         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  79                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
  80                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
  81 }
  82
  83 int usb_get_port_status(struct usb_device *dev, int port, void *data)
  84 {
  85         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  86                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
  87                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
  88 }
  89
  90
  91 static void usb_hub_power_on(struct usb_hub_device *hub)
  92 {
  93         int i;
  94         struct usb_device *dev;
  95         unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
  96         const char *env;
  97
  98         dev = hub->pusb_dev;
  99
 100         debug("enabling power on all ports\n");
 101         for (i = 0; i < dev->maxchild; i++) {
 102                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 103                 debug("port %d returns %lX\n", i + 1, dev->status);
 104         }
 105
 106         /*
 107          * Wait for power to become stable,
 108          * plus spec-defined max time for device to connect
 109          * but allow this time to be increased via env variable as some
 110          * devices break the spec and require longer warm-up times
 111          */
 112         env = getenv("usb_pgood_delay");
 113         if (env)
 114                 pgood_delay = max(pgood_delay,
 115                                   (unsigned)simple_strtol(env, NULL, 0));
 116         debug("pgood_delay=%dms\n", pgood_delay);
 117         mdelay(pgood_delay + 1000);
 118 }
 119
 120 void usb_hub_reset(void)
 121 {
 122         usb_hub_index = 0;
 123 }
 124
 125 static struct usb_hub_device *usb_hub_allocate(void)
 126 {
 127         if (usb_hub_index < USB_MAX_HUB)
 128                 return &hub_dev[usb_hub_index++];
 129
 130         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
 131         return NULL;
 132 }
 133
 134 #define MAX_TRIES 5
 135
 136 static inline char *portspeed(int portstatus)
 137 {
 138         char *speed_str;
 139
 140         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 141         case USB_PORT_STAT_SUPER_SPEED:
 142                 speed_str = "5 Gb/s";
 143                 break;
 144         case USB_PORT_STAT_HIGH_SPEED:
 145                 speed_str = "480 Mb/s";
 146                 break;
 147         case USB_PORT_STAT_LOW_SPEED:
 148                 speed_str = "1.5 Mb/s";
 149                 break;
 150         default:
 151                 speed_str = "12 Mb/s";
 152                 break;
 153         }
 154
 155         return speed_str;
 156 }
 157
 158 int legacy_hub_port_reset(struct usb_device *dev, int port,
 159                         unsigned short *portstat)
 160 {
 161         int err, tries;
 162         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 163         unsigned short portstatus, portchange;
 164
 165 #ifdef CONFIG_DM_USB
 166         debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
 167               port + 1);
 168 #else
 169         debug("%s: resetting port %d...\n", __func__, port + 1);
 170 #endif
 171         for (tries = 0; tries < MAX_TRIES; tries++) {
 172                 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 173                 if (err < 0)
 174                         return err;
 175
 176                 mdelay(200);
 177
 178                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 179                         debug("get_port_status failed status %lX\n",
 180                               dev->status);
 181                         return -1;
 182                 }
 183                 portstatus = le16_to_cpu(portsts->wPortStatus);
 184                 portchange = le16_to_cpu(portsts->wPortChange);
 185
 186                 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
 187                                                         portspeed(portstatus));
 188
 189                 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
 190                       "  USB_PORT_STAT_ENABLE %d\n",
 191                       (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
 192                       (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
 193                       (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 194
 195                 /*
 196                  * Perhaps we should check for the following here:
 197                  * - C_CONNECTION hasn't been set.
 198                  * - CONNECTION is still set.
 199                  *
 200                  * Doing so would ensure that the device is still connected
 201                  * to the bus, and hasn't been unplugged or replaced while the
 202                  * USB bus reset was going on.
 203                  *
 204                  * However, if we do that, then (at least) a San Disk Ultra
 205                  * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
 206                  * Tegra Jetson TK1 board. For some reason, the device appears
 207                  * to briefly drop off the bus when this second bus reset is
 208                  * executed, yet if we retry this loop, it'll eventually come
 209                  * back after another reset or two.
 210                  */
 211
 212                 if (portstatus & USB_PORT_STAT_ENABLE)
 213                         break;
 214
 215                 mdelay(200);
 216         }
 217
 218         if (tries == MAX_TRIES) {
 219                 debug("Cannot enable port %i after %i retries, " \
 220                       "disabling port.\n", port + 1, MAX_TRIES);
 221                 debug("Maybe the USB cable is bad?\n");
 222                 return -1;
 223         }
 224
 225         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
 226         *portstat = portstatus;
 227         return 0;
 228 }
 229
 230 #ifdef CONFIG_DM_USB
 231 int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
 232 {
 233         struct usb_device *udev = dev_get_parent_priv(dev);
 234
 235         return legacy_hub_port_reset(udev, port, portstat);
 236 }
 237 #endif
 238
 239 int usb_hub_port_connect_change(struct usb_device *dev, int port)
 240 {
 241         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 242         unsigned short portstatus;
 243         int ret, speed;
 244
 245         /* Check status */
 246         ret = usb_get_port_status(dev, port + 1, portsts);
 247         if (ret < 0) {
 248                 debug("get_port_status failed\n");
 249                 return ret;
 250         }
 251
 252         portstatus = le16_to_cpu(portsts->wPortStatus);
 253         debug("portstatus %x, change %x, %s\n",
 254               portstatus,
 255               le16_to_cpu(portsts->wPortChange),
 256               portspeed(portstatus));
 257
 258         /* Clear the connection change status */
 259         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
 260
 261         /* Disconnect any existing devices under this port */
 262         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
 263              (!(portstatus & USB_PORT_STAT_ENABLE))) ||
 264             usb_device_has_child_on_port(dev, port)) {
 265                 debug("usb_disconnect(&hub->children[port]);\n");
 266                 /* Return now if nothing is connected */
 267                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
 268                         return -ENOTCONN;
 269         }
 270         mdelay(200);
 271
 272         /* Reset the port */
 273         ret = legacy_hub_port_reset(dev, port, &portstatus);
 274         if (ret < 0) {
 275                 if (ret != -ENXIO)
 276                         printf("cannot reset port %i!?\n", port + 1);
 277                 return ret;
 278         }
 279
 280         mdelay(200);
 281
 282         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 283         case USB_PORT_STAT_SUPER_SPEED:
 284                 speed = USB_SPEED_SUPER;
 285                 break;
 286         case USB_PORT_STAT_HIGH_SPEED:
 287                 speed = USB_SPEED_HIGH;
 288                 break;
 289         case USB_PORT_STAT_LOW_SPEED:
 290                 speed = USB_SPEED_LOW;
 291                 break;
 292         default:
 293                 speed = USB_SPEED_FULL;
 294                 break;
 295         }
 296
 297 #ifdef CONFIG_DM_USB
 298         struct udevice *child;
 299
 300         ret = usb_scan_device(dev->dev, port + 1, speed, &child);
 301 #else
 302         struct usb_device *usb;
 303
 304         ret = usb_alloc_new_device(dev->controller, &usb);
 305         if (ret) {
 306                 printf("cannot create new device: ret=%d", ret);
 307                 return ret;
 308         }
 309
 310         dev->children[port] = usb;
 311         usb->speed = speed;
 312         usb->parent = dev;
 313         usb->portnr = port + 1;
 314         /* Run it through the hoops (find a driver, etc) */
 315         ret = usb_new_device(usb);
 316         if (ret < 0) {
 317                 /* Woops, disable the port */
 318                 usb_free_device(dev->controller);
 319                 dev->children[port] = NULL;
 320         }
 321 #endif
 322         if (ret < 0) {
 323                 debug("hub: disabling port %d\n", port + 1);
 324                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
 325         }
 326
 327         return ret;
 328 }
 329
 330
 331 static int usb_hub_configure(struct usb_device *dev)
 332 {
 333         int i, length;
 334         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
 335         unsigned char *bitmap;
 336         short hubCharacteristics;
 337         struct usb_hub_descriptor *descriptor;
 338         struct usb_hub_device *hub;
 339         __maybe_unused struct usb_hub_status *hubsts;
 340         int ret;
 341
 342         /* "allocate" Hub device */
 343         hub = usb_hub_allocate();
 344         if (hub == NULL)
 345                 return -ENOMEM;
 346         hub->pusb_dev = dev;
 347         /* Get the the hub descriptor */
 348         ret = usb_get_hub_descriptor(dev, buffer, 4);
 349         if (ret < 0) {
 350                 debug("usb_hub_configure: failed to get hub " \
 351                       "descriptor, giving up %lX\n", dev->status);
 352                 return ret;
 353         }
 354         descriptor = (struct usb_hub_descriptor *)buffer;
 355
 356         length = min_t(int, descriptor->bLength,
 357                        sizeof(struct usb_hub_descriptor));
 358
 359         ret = usb_get_hub_descriptor(dev, buffer, length);
 360         if (ret < 0) {
 361                 debug("usb_hub_configure: failed to get hub " \
 362                       "descriptor 2nd giving up %lX\n", dev->status);
 363                 return ret;
 364         }
 365         memcpy((unsigned char *)&hub->desc, buffer, length);
 366         /* adjust 16bit values */
 367         put_unaligned(le16_to_cpu(get_unaligned(
 368                         &descriptor->wHubCharacteristics)),
 369                         &hub->desc.wHubCharacteristics);
 370         /* set the bitmap */
 371         bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
 372         /* devices not removable by default */
 373         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
 374         bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
 375         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
 376
 377         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 378                 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
 379
 380         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 381                 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
 382
 383         dev->maxchild = descriptor->bNbrPorts;
 384         debug("%d ports detected\n", dev->maxchild);
 385
 386         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
 387         switch (hubCharacteristics & HUB_CHAR_LPSM) {
 388         case 0x00:
 389                 debug("ganged power switching\n");
 390                 break;
 391         case 0x01:
 392                 debug("individual port power switching\n");
 393                 break;
 394         case 0x02:
 395         case 0x03:
 396                 debug("unknown reserved power switching mode\n");
 397                 break;
 398         }
 399
 400         if (hubCharacteristics & HUB_CHAR_COMPOUND)
 401                 debug("part of a compound device\n");
 402         else
 403                 debug("standalone hub\n");
 404
 405         switch (hubCharacteristics & HUB_CHAR_OCPM) {
 406         case 0x00:
 407                 debug("global over-current protection\n");
 408                 break;
 409         case 0x08:
 410                 debug("individual port over-current protection\n");
 411                 break;
 412         case 0x10:
 413         case 0x18:
 414                 debug("no over-current protection\n");
 415                 break;
 416         }
 417
 418         debug("power on to power good time: %dms\n",
 419               descriptor->bPwrOn2PwrGood * 2);
 420         debug("hub controller current requirement: %dmA\n",
 421               descriptor->bHubContrCurrent);
 422
 423         for (i = 0; i < dev->maxchild; i++)
 424                 debug("port %d is%s removable\n", i + 1,
 425                       hub->desc.DeviceRemovable[(i + 1) / 8] & \
 426                       (1 << ((i + 1) % 8)) ? " not" : "");
 427
 428         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
 429                 debug("usb_hub_configure: failed to get Status - " \
 430                       "too long: %d\n", descriptor->bLength);
 431                 return -EFBIG;
 432         }
 433
 434         ret = usb_get_hub_status(dev, buffer);
 435         if (ret < 0) {
 436                 debug("usb_hub_configure: failed to get Status %lX\n",
 437                       dev->status);
 438                 return ret;
 439         }
 440
 441 #ifdef DEBUG
 442         hubsts = (struct usb_hub_status *)buffer;
 443 #endif
 444
 445         debug("get_hub_status returned status %X, change %X\n",
 446               le16_to_cpu(hubsts->wHubStatus),
 447               le16_to_cpu(hubsts->wHubChange));
 448         debug("local power source is %s\n",
 449               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
 450               "lost (inactive)" : "good");
 451         debug("%sover-current condition exists\n",
 452               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
 453               "" : "no ");
 454         usb_hub_power_on(hub);
 455
 456         /*
 457          * Reset any devices that may be in a bad state when applying
 458          * the power.  This is a __weak function.  Resetting of the devices
 459          * should occur in the board file of the device.
 460          */
 461         for (i = 0; i < dev->maxchild; i++)
 462                 usb_hub_reset_devices(i + 1);
 463
 464         for (i = 0; i < dev->maxchild; i++) {
 465                 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 466                 unsigned short portstatus, portchange;
 467                 int ret;
 468                 ulong start = get_timer(0);
 469
 470 #ifdef CONFIG_DM_USB
 471                 debug("\n\nScanning '%s' port %d\n", dev->dev->name, i + 1);
 472 #else
 473                 debug("\n\nScanning port %d\n", i + 1);
 474 #endif
 475                 /*
 476                  * Wait for (whichever finishes first)
 477                  *  - A maximum of 10 seconds
 478                  *    This is a purely observational value driven by connecting
 479                  *    a few broken pen drives and taking the max * 1.5 approach
 480                  *  - connection_change and connection state to report same
 481                  *    state
 482                  */
 483                 do {
 484                         ret = usb_get_port_status(dev, i + 1, portsts);
 485                         if (ret < 0) {
 486                                 debug("get_port_status failed\n");
 487                                 break;
 488                         }
 489
 490                         portstatus = le16_to_cpu(portsts->wPortStatus);
 491                         portchange = le16_to_cpu(portsts->wPortChange);
 492
 493                         /* No connection change happened, wait a bit more. */
 494                         if (!(portchange & USB_PORT_STAT_C_CONNECTION))
 495                                 continue;
 496
 497                         /* Test if the connection came up, and if so, exit. */
 498                         if (portstatus & USB_PORT_STAT_CONNECTION)
 499                                 break;
 500
 501                 } while (get_timer(start) < CONFIG_SYS_HZ * 1);
 502
 503                 if (ret < 0)
 504                         continue;
 505
 506                 debug("Port %d Status %X Change %X\n",
 507                       i + 1, portstatus, portchange);
 508
 509                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
 510                         debug("port %d connection change\n", i + 1);
 511                         usb_hub_port_connect_change(dev, i);
 512                 }
 513                 if (portchange & USB_PORT_STAT_C_ENABLE) {
 514                         debug("port %d enable change, status %x\n",
 515                               i + 1, portstatus);
 516                         usb_clear_port_feature(dev, i + 1,
 517                                                 USB_PORT_FEAT_C_ENABLE);
 518                         /*
 519                          * The following hack causes a ghost device problem
 520                          * to Faraday EHCI
 521                          */
 522 #ifndef CONFIG_USB_EHCI_FARADAY
 523                         /* EM interference sometimes causes bad shielded USB
 524                          * devices to be shutdown by the hub, this hack enables
 525                          * them again. Works at least with mouse driver */
 526                         if (!(portstatus & USB_PORT_STAT_ENABLE) &&
 527                              (portstatus & USB_PORT_STAT_CONNECTION) &&
 528                              usb_device_has_child_on_port(dev, i)) {
 529                                 debug("already running port %i "  \
 530                                       "disabled by hub (EMI?), " \
 531                                       "re-enabling...\n", i + 1);
 532                                       usb_hub_port_connect_change(dev, i);
 533                         }
 534 #endif
 535                 }
 536                 if (portstatus & USB_PORT_STAT_SUSPEND) {
 537                         debug("port %d suspend change\n", i + 1);
 538                         usb_clear_port_feature(dev, i + 1,
 539                                                 USB_PORT_FEAT_SUSPEND);
 540                 }
 541
 542                 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
 543                         debug("port %d over-current change\n", i + 1);
 544                         usb_clear_port_feature(dev, i + 1,
 545                                                 USB_PORT_FEAT_C_OVER_CURRENT);
 546                         usb_hub_power_on(hub);
 547                 }
 548
 549                 if (portchange & USB_PORT_STAT_C_RESET) {
 550                         debug("port %d reset change\n", i + 1);
 551                         usb_clear_port_feature(dev, i + 1,
 552                                                 USB_PORT_FEAT_C_RESET);
 553                 }
 554         } /* end for i all ports */
 555
 556         return 0;
 557 }
 558
 559 static int usb_hub_check(struct usb_device *dev, int ifnum)
 560 {
 561         struct usb_interface *iface;
 562         struct usb_endpoint_descriptor *ep = NULL;
 563
 564         iface = &dev->config.if_desc[ifnum];
 565         /* Is it a hub? */
 566         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
 567                 goto err;
 568         /* Some hubs have a subclass of 1, which AFAICT according to the */
 569         /*  specs is not defined, but it works */
 570         if ((iface->desc.bInterfaceSubClass != 0) &&
 571             (iface->desc.bInterfaceSubClass != 1))
 572                 goto err;
 573         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
 574         if (iface->desc.bNumEndpoints != 1)
 575                 goto err;
 576         ep = &iface->ep_desc[0];
 577         /* Output endpoint? Curiousier and curiousier.. */
 578         if (!(ep->bEndpointAddress & USB_DIR_IN))
 579                 goto err;
 580         /* If it's not an interrupt endpoint, we'd better punt! */
 581         if ((ep->bmAttributes & 3) != 3)
 582                 goto err;
 583         /* We found a hub */
 584         debug("USB hub found\n");
 585         return 0;
 586
 587 err:
 588         debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
 589               iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
 590               iface->desc.bNumEndpoints);
 591         if (ep) {
 592                 debug("   bEndpointAddress=%#x, bmAttributes=%d",
 593                       ep->bEndpointAddress, ep->bmAttributes);
 594         }
 595
 596         return -ENOENT;
 597 }
 598
 599 int usb_hub_probe(struct usb_device *dev, int ifnum)
 600 {
 601         int ret;
 602
 603         ret = usb_hub_check(dev, ifnum);
 604         if (ret)
 605                 return 0;
 606         ret = usb_hub_configure(dev);
 607         return ret;
 608 }
 609
 610 #ifdef CONFIG_DM_USB
 611 int usb_hub_scan(struct udevice *hub)
 612 {
 613         struct usb_device *udev = dev_get_parent_priv(hub);
 614
 615         return usb_hub_configure(udev);
 616 }
 617
 618 static int usb_hub_post_bind(struct udevice *dev)
 619 {
 620         /* Scan the bus for devices */
 621         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 622 }
 623
 624 static int usb_hub_post_probe(struct udevice *dev)
 625 {
 626         debug("%s\n", __func__);
 627         return usb_hub_scan(dev);
 628 }
 629
 630 static const struct udevice_id usb_hub_ids[] = {
 631         { .compatible = "usb-hub" },
 632         { }
 633 };
 634
 635 U_BOOT_DRIVER(usb_generic_hub) = {
 636         .name   = "usb_hub",
 637         .id     = UCLASS_USB_HUB,
 638         .of_match = usb_hub_ids,
 639         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 640 };
 641
 642 UCLASS_DRIVER(usb_hub) = {
 643         .id             = UCLASS_USB_HUB,
 644         .name           = "usb_hub",
 645         .post_bind      = usb_hub_post_bind,
 646         .post_probe     = usb_hub_post_probe,
 647         .child_pre_probe        = usb_child_pre_probe,
 648         .per_child_auto_alloc_size = sizeof(struct usb_device),
 649         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 650 };
 651
 652 static const struct usb_device_id hub_id_table[] = {
 653         {
 654                 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
 655                 .bDeviceClass = USB_CLASS_HUB
 656         },
 657         { }     /* Terminating entry */
 658 };
 659
 660 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);
 661
 662 #endif