common/usb_hub.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Most of this source has been derived from the Linux USB
   4  * project:
   5  * (C) Copyright Linus Torvalds 1999
   6  * (C) Copyright Johannes Erdfelt 1999-2001
   7  * (C) Copyright Andreas Gal 1999
   8  * (C) Copyright Gregory P. Smith 1999
   9  * (C) Copyright Deti Fliegl 1999 (new USB architecture)
  10  * (C) Copyright Randy Dunlap 2000
  11  * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
  12  * (C) Copyright Yggdrasil Computing, Inc. 2000
  13  *     (usb_device_id matching changes by Adam J. Richter)
  14  *
  15  * Adapted for U-Boot:
  16  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
  17  */
  18
  19 /****************************************************************************
  20  * HUB "Driver"
  21  * Probes device for being a hub and configurate it
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <dm.h>
  27 #include <errno.h>
  28 #include <memalign.h>
  29 #include <asm/processor.h>
  30 #include <asm/unaligned.h>
  31 #include <linux/ctype.h>
  32 #include <linux/list.h>
  33 #include <asm/byteorder.h>
  34 #ifdef CONFIG_SANDBOX
  35 #include <asm/state.h>
  36 #endif
  37 #include <asm/unaligned.h>
  38
  39 #include <usb.h>
  40
  41 #define USB_BUFSIZ      512
  42
  43 #define HUB_SHORT_RESET_TIME    20
  44 #define HUB_LONG_RESET_TIME     200
  45
  46 #define PORT_OVERCURRENT_MAX_SCAN_COUNT         3
  47
  48 struct usb_device_scan {
  49         struct usb_device *dev;         /* USB hub device to scan */
  50         struct usb_hub_device *hub;     /* USB hub struct */
  51         int port;                       /* USB port to scan */
  52         struct list_head list;
  53 };
  54
  55 static LIST_HEAD(usb_scan_list);
  56
  57 __weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
  58 {
  59         return;
  60 }
  61
  62 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
  63 {
  64         return hdev->descriptor.bDeviceProtocol == 3;
  65 }
  66
  67 #if CONFIG_IS_ENABLED(DM_USB)
  68 bool usb_hub_is_root_hub(struct udevice *hub)
  69 {
  70         if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
  71                 return true;
  72
  73         return false;
  74 }
  75
  76 static int usb_set_hub_depth(struct usb_device *dev, int depth)
  77 {
  78         if (depth < 0 || depth > 4)
  79                 return -EINVAL;
  80
  81         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  82                 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
  83                 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
  84 }
  85 #endif
  86
  87 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
  88 {
  89         unsigned short dtype = USB_DT_HUB;
  90
  91         if (usb_hub_is_superspeed(dev))
  92                 dtype = USB_DT_SS_HUB;
  93
  94         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  95                 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  96                 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
  97 }
  98
  99 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
 100 {
 101         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 102                                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
 103                                 port, NULL, 0, USB_CNTL_TIMEOUT);
 104 }
 105
 106 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
 107 {
 108         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 109                                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
 110                                 port, NULL, 0, USB_CNTL_TIMEOUT);
 111 }
 112
 113 static int usb_get_hub_status(struct usb_device *dev, void *data)
 114 {
 115         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 116                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
 117                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
 118 }
 119
 120 int usb_get_port_status(struct usb_device *dev, int port, void *data)
 121 {
 122         int ret;
 123
 124         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 125                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
 126                         data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
 127
 128 #if CONFIG_IS_ENABLED(DM_USB)
 129         if (ret < 0)
 130                 return ret;
 131
 132         /*
 133          * Translate the USB 3.0 hub port status field into the old version
 134          * that U-Boot understands. Do this only when the hub is not root hub.
 135          * For root hub, the port status field has already been translated
 136          * in the host controller driver (see xhci_submit_root() in xhci.c).
 137          *
 138          * Note: this only supports driver model.
 139          */
 140
 141         if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
 142                 struct usb_port_status *status = (struct usb_port_status *)data;
 143                 u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
 144
 145                 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
 146                         tmp |= USB_PORT_STAT_POWER;
 147                 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
 148                     USB_SS_PORT_STAT_SPEED_5GBPS)
 149                         tmp |= USB_PORT_STAT_SUPER_SPEED;
 150
 151                 status->wPortStatus = tmp;
 152         }
 153 #endif
 154
 155         return ret;
 156 }
 157
 158
 159 static void usb_hub_power_on(struct usb_hub_device *hub)
 160 {
 161         int i;
 162         struct usb_device *dev;
 163         unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
 164         const char *env;
 165
 166         dev = hub->pusb_dev;
 167
 168         debug("enabling power on all ports\n");
 169         for (i = 0; i < dev->maxchild; i++) {
 170                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 171                 debug("port %d returns %lX\n", i + 1, dev->status);
 172         }
 173
 174 #ifdef CONFIG_SANDBOX
 175         /*
 176          * Don't set timeout / delay values here. This results
 177          * in these values still being reset to 0.
 178          */
 179         if (state_get_skip_delays())
 180                 return;
 181 #endif
 182
 183         /*
 184          * Wait for power to become stable,
 185          * plus spec-defined max time for device to connect
 186          * but allow this time to be increased via env variable as some
 187          * devices break the spec and require longer warm-up times
 188          */
 189         env = env_get("usb_pgood_delay");
 190         if (env)
 191                 pgood_delay = max(pgood_delay,
 192                                   (unsigned)simple_strtol(env, NULL, 0));
 193         debug("pgood_delay=%dms\n", pgood_delay);
 194
 195         /*
 196          * Do a minimum delay of the larger value of 100ms or pgood_delay
 197          * so that the power can stablize before the devices are queried
 198          */
 199         hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
 200
 201         /*
 202          * Record the power-on timeout here. The max. delay (timeout)
 203          * will be done based on this value in the USB port loop in
 204          * usb_hub_configure() later.
 205          */
 206         hub->connect_timeout = hub->query_delay + 1000;
 207         debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
 208               dev->devnum, max(100, (int)pgood_delay),
 209               max(100, (int)pgood_delay) + 1000);
 210 }
 211
 212 #if !CONFIG_IS_ENABLED(DM_USB)
 213 static struct usb_hub_device hub_dev[USB_MAX_HUB];
 214 static int usb_hub_index;
 215
 216 void usb_hub_reset(void)
 217 {
 218         usb_hub_index = 0;
 219
 220         /* Zero out global hub_dev in case its re-used again */
 221         memset(hub_dev, 0, sizeof(hub_dev));
 222 }
 223
 224 static struct usb_hub_device *usb_hub_allocate(void)
 225 {
 226         if (usb_hub_index < USB_MAX_HUB)
 227                 return &hub_dev[usb_hub_index++];
 228
 229         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
 230         return NULL;
 231 }
 232 #endif
 233
 234 #define MAX_TRIES 5
 235
 236 static inline const char *portspeed(int portstatus)
 237 {
 238         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 239         case USB_PORT_STAT_SUPER_SPEED:
 240                 return "5 Gb/s";
 241         case USB_PORT_STAT_HIGH_SPEED:
 242                 return "480 Mb/s";
 243         case USB_PORT_STAT_LOW_SPEED:
 244                 return "1.5 Mb/s";
 245         default:
 246                 return "12 Mb/s";
 247         }
 248 }
 249
 250 /**
 251  * usb_hub_port_reset() - reset a port given its usb_device pointer
 252  *
 253  * Reset a hub port and see if a device is present on that port, providing
 254  * sufficient time for it to show itself. The port status is returned.
 255  *
 256  * @dev:        USB device to reset
 257  * @port:       Port number to reset (note ports are numbered from 0 here)
 258  * @portstat:   Returns port status
 259  */
 260 static int usb_hub_port_reset(struct usb_device *dev, int port,
 261                               unsigned short *portstat)
 262 {
 263         int err, tries;
 264         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 265         unsigned short portstatus, portchange;
 266         int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
 267
 268 #if CONFIG_IS_ENABLED(DM_USB)
 269         debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
 270               port + 1);
 271 #else
 272         debug("%s: resetting port %d...\n", __func__, port + 1);
 273 #endif
 274         for (tries = 0; tries < MAX_TRIES; tries++) {
 275                 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 276                 if (err < 0)
 277                         return err;
 278
 279                 mdelay(delay);
 280
 281                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 282                         debug("get_port_status failed status %lX\n",
 283                               dev->status);
 284                         return -1;
 285                 }
 286                 portstatus = le16_to_cpu(portsts->wPortStatus);
 287                 portchange = le16_to_cpu(portsts->wPortChange);
 288
 289                 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
 290                                                         portspeed(portstatus));
 291
 292                 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
 293                       "  USB_PORT_STAT_ENABLE %d\n",
 294                       (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
 295                       (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
 296                       (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 297
 298                 /*
 299                  * Perhaps we should check for the following here:
 300                  * - C_CONNECTION hasn't been set.
 301                  * - CONNECTION is still set.
 302                  *
 303                  * Doing so would ensure that the device is still connected
 304                  * to the bus, and hasn't been unplugged or replaced while the
 305                  * USB bus reset was going on.
 306                  *
 307                  * However, if we do that, then (at least) a San Disk Ultra
 308                  * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
 309                  * Tegra Jetson TK1 board. For some reason, the device appears
 310                  * to briefly drop off the bus when this second bus reset is
 311                  * executed, yet if we retry this loop, it'll eventually come
 312                  * back after another reset or two.
 313                  */
 314
 315                 if (portstatus & USB_PORT_STAT_ENABLE)
 316                         break;
 317
 318                 /* Switch to long reset delay for the next round */
 319                 delay = HUB_LONG_RESET_TIME;
 320         }
 321
 322         if (tries == MAX_TRIES) {
 323                 debug("Cannot enable port %i after %i retries, " \
 324                       "disabling port.\n", port + 1, MAX_TRIES);
 325                 debug("Maybe the USB cable is bad?\n");
 326                 return -1;
 327         }
 328
 329         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
 330         *portstat = portstatus;
 331         return 0;
 332 }
 333
 334 int usb_hub_port_connect_change(struct usb_device *dev, int port)
 335 {
 336         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 337         unsigned short portstatus;
 338         int ret, speed;
 339
 340         /* Check status */
 341         ret = usb_get_port_status(dev, port + 1, portsts);
 342         if (ret < 0) {
 343                 debug("get_port_status failed\n");
 344                 return ret;
 345         }
 346
 347         portstatus = le16_to_cpu(portsts->wPortStatus);
 348         debug("portstatus %x, change %x, %s\n",
 349               portstatus,
 350               le16_to_cpu(portsts->wPortChange),
 351               portspeed(portstatus));
 352
 353         /* Clear the connection change status */
 354         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
 355
 356         /* Disconnect any existing devices under this port */
 357         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
 358              (!(portstatus & USB_PORT_STAT_ENABLE))) ||
 359             usb_device_has_child_on_port(dev, port)) {
 360                 debug("usb_disconnect(&hub->children[port]);\n");
 361                 /* Return now if nothing is connected */
 362                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
 363                         return -ENOTCONN;
 364         }
 365
 366         /* Reset the port */
 367         ret = usb_hub_port_reset(dev, port, &portstatus);
 368         if (ret < 0) {
 369                 if (ret != -ENXIO)
 370                         printf("cannot reset port %i!?\n", port + 1);
 371                 return ret;
 372         }
 373
 374         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 375         case USB_PORT_STAT_SUPER_SPEED:
 376                 speed = USB_SPEED_SUPER;
 377                 break;
 378         case USB_PORT_STAT_HIGH_SPEED:
 379                 speed = USB_SPEED_HIGH;
 380                 break;
 381         case USB_PORT_STAT_LOW_SPEED:
 382                 speed = USB_SPEED_LOW;
 383                 break;
 384         default:
 385                 speed = USB_SPEED_FULL;
 386                 break;
 387         }
 388
 389 #if CONFIG_IS_ENABLED(DM_USB)
 390         struct udevice *child;
 391
 392         ret = usb_scan_device(dev->dev, port + 1, speed, &child);
 393 #else
 394         struct usb_device *usb;
 395
 396         ret = usb_alloc_new_device(dev->controller, &usb);
 397         if (ret) {
 398                 printf("cannot create new device: ret=%d", ret);
 399                 return ret;
 400         }
 401
 402         dev->children[port] = usb;
 403         usb->speed = speed;
 404         usb->parent = dev;
 405         usb->portnr = port + 1;
 406         /* Run it through the hoops (find a driver, etc) */
 407         ret = usb_new_device(usb);
 408         if (ret < 0) {
 409                 /* Woops, disable the port */
 410                 usb_free_device(dev->controller);
 411                 dev->children[port] = NULL;
 412         }
 413 #endif
 414         if (ret < 0) {
 415                 debug("hub: disabling port %d\n", port + 1);
 416                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
 417         }
 418
 419         return ret;
 420 }
 421
 422 static int usb_scan_port(struct usb_device_scan *usb_scan)
 423 {
 424         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 425         unsigned short portstatus;
 426         unsigned short portchange;
 427         struct usb_device *dev;
 428         struct usb_hub_device *hub;
 429         int ret = 0;
 430         int i;
 431
 432         dev = usb_scan->dev;
 433         hub = usb_scan->hub;
 434         i = usb_scan->port;
 435
 436         /*
 437          * Don't talk to the device before the query delay is expired.
 438          * This is needed for voltages to stabalize.
 439          */
 440         if (get_timer(0) < hub->query_delay)
 441                 return 0;
 442
 443         ret = usb_get_port_status(dev, i + 1, portsts);
 444         if (ret < 0) {
 445                 debug("get_port_status failed\n");
 446                 if (get_timer(0) >= hub->connect_timeout) {
 447                         debug("devnum=%d port=%d: timeout\n",
 448                               dev->devnum, i + 1);
 449                         /* Remove this device from scanning list */
 450                         list_del(&usb_scan->list);
 451                         free(usb_scan);
 452                         return 0;
 453                 }
 454                 return 0;
 455         }
 456
 457         portstatus = le16_to_cpu(portsts->wPortStatus);
 458         portchange = le16_to_cpu(portsts->wPortChange);
 459         debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
 460
 461         /*
 462          * No connection change happened, wait a bit more.
 463          *
 464          * For some situation, the hub reports no connection change but a
 465          * device is connected to the port (eg: CCS bit is set but CSC is not
 466          * in the PORTSC register of a root hub), ignore such case.
 467          */
 468         if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
 469             !(portstatus & USB_PORT_STAT_CONNECTION)) {
 470                 if (get_timer(0) >= hub->connect_timeout) {
 471                         debug("devnum=%d port=%d: timeout\n",
 472                               dev->devnum, i + 1);
 473                         /* Remove this device from scanning list */
 474                         list_del(&usb_scan->list);
 475                         free(usb_scan);
 476                         return 0;
 477                 }
 478                 return 0;
 479         }
 480
 481         if (portchange & USB_PORT_STAT_C_RESET) {
 482                 debug("port %d reset change\n", i + 1);
 483                 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
 484         }
 485
 486         if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
 487             usb_hub_is_superspeed(dev)) {
 488                 debug("port %d BH reset change\n", i + 1);
 489                 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
 490         }
 491
 492         /* A new USB device is ready at this point */
 493         debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
 494
 495         usb_hub_port_connect_change(dev, i);
 496
 497         if (portchange & USB_PORT_STAT_C_ENABLE) {
 498                 debug("port %d enable change, status %x\n", i + 1, portstatus);
 499                 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
 500                 /*
 501                  * The following hack causes a ghost device problem
 502                  * to Faraday EHCI
 503                  */
 504 #ifndef CONFIG_USB_EHCI_FARADAY
 505                 /*
 506                  * EM interference sometimes causes bad shielded USB
 507                  * devices to be shutdown by the hub, this hack enables
 508                  * them again. Works at least with mouse driver
 509                  */
 510                 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
 511                     (portstatus & USB_PORT_STAT_CONNECTION) &&
 512                     usb_device_has_child_on_port(dev, i)) {
 513                         debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
 514                               i + 1);
 515                         usb_hub_port_connect_change(dev, i);
 516                 }
 517 #endif
 518         }
 519
 520         if (portstatus & USB_PORT_STAT_SUSPEND) {
 521                 debug("port %d suspend change\n", i + 1);
 522                 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
 523         }
 524
 525         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
 526                 debug("port %d over-current change\n", i + 1);
 527                 usb_clear_port_feature(dev, i + 1,
 528                                        USB_PORT_FEAT_C_OVER_CURRENT);
 529                 /* Only power-on this one port */
 530                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 531                 hub->overcurrent_count[i]++;
 532
 533                 /*
 534                  * If the max-scan-count is not reached, return without removing
 535                  * the device from scan-list. This will re-issue a new scan.
 536                  */
 537                 if (hub->overcurrent_count[i] <=
 538                     PORT_OVERCURRENT_MAX_SCAN_COUNT)
 539                         return 0;
 540
 541                 /* Otherwise the device will get removed */
 542                 printf("Port %d over-current occurred %d times\n", i + 1,
 543                        hub->overcurrent_count[i]);
 544         }
 545
 546         /*
 547          * We're done with this device, so let's remove this device from
 548          * scanning list
 549          */
 550         list_del(&usb_scan->list);
 551         free(usb_scan);
 552
 553         return 0;
 554 }
 555
 556 static int usb_device_list_scan(void)
 557 {
 558         struct usb_device_scan *usb_scan;
 559         struct usb_device_scan *tmp;
 560         static int running;
 561         int ret = 0;
 562
 563         /* Only run this loop once for each controller */
 564         if (running)
 565                 return 0;
 566
 567         running = 1;
 568
 569         while (1) {
 570                 /* We're done, once the list is empty again */
 571                 if (list_empty(&usb_scan_list))
 572                         goto out;
 573
 574                 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
 575                         int ret;
 576
 577                         /* Scan this port */
 578                         ret = usb_scan_port(usb_scan);
 579                         if (ret)
 580                                 goto out;
 581                 }
 582         }
 583
 584 out:
 585         /*
 586          * This USB controller has finished scanning all its connected
 587          * USB devices. Set "running" back to 0, so that other USB controllers
 588          * will scan their devices too.
 589          */
 590         running = 0;
 591
 592         return ret;
 593 }
 594
 595 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
 596 {
 597         struct usb_hub_device *hub;
 598
 599 #if !CONFIG_IS_ENABLED(DM_USB)
 600         /* "allocate" Hub device */
 601         hub = usb_hub_allocate();
 602 #else
 603         hub = dev_get_uclass_priv(dev->dev);
 604 #endif
 605
 606         return hub;
 607 }
 608
 609 static int usb_hub_configure(struct usb_device *dev)
 610 {
 611         int i, length;
 612         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
 613         unsigned char *bitmap;
 614         short hubCharacteristics;
 615         struct usb_hub_descriptor *descriptor;
 616         struct usb_hub_device *hub;
 617         struct usb_hub_status *hubsts;
 618         int ret;
 619
 620         hub = usb_get_hub_device(dev);
 621         if (hub == NULL)
 622                 return -ENOMEM;
 623         hub->pusb_dev = dev;
 624
 625         /* Get the the hub descriptor */
 626         ret = usb_get_hub_descriptor(dev, buffer, 4);
 627         if (ret < 0) {
 628                 debug("usb_hub_configure: failed to get hub " \
 629                       "descriptor, giving up %lX\n", dev->status);
 630                 return ret;
 631         }
 632         descriptor = (struct usb_hub_descriptor *)buffer;
 633
 634         length = min_t(int, descriptor->bLength,
 635                        sizeof(struct usb_hub_descriptor));
 636
 637         ret = usb_get_hub_descriptor(dev, buffer, length);
 638         if (ret < 0) {
 639                 debug("usb_hub_configure: failed to get hub " \
 640                       "descriptor 2nd giving up %lX\n", dev->status);
 641                 return ret;
 642         }
 643         memcpy((unsigned char *)&hub->desc, buffer, length);
 644         /* adjust 16bit values */
 645         put_unaligned(le16_to_cpu(get_unaligned(
 646                         &descriptor->wHubCharacteristics)),
 647                         &hub->desc.wHubCharacteristics);
 648         /* set the bitmap */
 649         bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
 650         /* devices not removable by default */
 651         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
 652         bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
 653         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
 654
 655         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 656                 hub->desc.u.hs.DeviceRemovable[i] =
 657                         descriptor->u.hs.DeviceRemovable[i];
 658
 659         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 660                 hub->desc.u.hs.PortPowerCtrlMask[i] =
 661                         descriptor->u.hs.PortPowerCtrlMask[i];
 662
 663         dev->maxchild = descriptor->bNbrPorts;
 664         debug("%d ports detected\n", dev->maxchild);
 665
 666         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
 667         switch (hubCharacteristics & HUB_CHAR_LPSM) {
 668         case 0x00:
 669                 debug("ganged power switching\n");
 670                 break;
 671         case 0x01:
 672                 debug("individual port power switching\n");
 673                 break;
 674         case 0x02:
 675         case 0x03:
 676                 debug("unknown reserved power switching mode\n");
 677                 break;
 678         }
 679
 680         if (hubCharacteristics & HUB_CHAR_COMPOUND)
 681                 debug("part of a compound device\n");
 682         else
 683                 debug("standalone hub\n");
 684
 685         switch (hubCharacteristics & HUB_CHAR_OCPM) {
 686         case 0x00:
 687                 debug("global over-current protection\n");
 688                 break;
 689         case 0x08:
 690                 debug("individual port over-current protection\n");
 691                 break;
 692         case 0x10:
 693         case 0x18:
 694                 debug("no over-current protection\n");
 695                 break;
 696         }
 697
 698         switch (dev->descriptor.bDeviceProtocol) {
 699         case USB_HUB_PR_FS:
 700                 break;
 701         case USB_HUB_PR_HS_SINGLE_TT:
 702                 debug("Single TT\n");
 703                 break;
 704         case USB_HUB_PR_HS_MULTI_TT:
 705                 ret = usb_set_interface(dev, 0, 1);
 706                 if (ret == 0) {
 707                         debug("TT per port\n");
 708                         hub->tt.multi = true;
 709                 } else {
 710                         debug("Using single TT (err %d)\n", ret);
 711                 }
 712                 break;
 713         case USB_HUB_PR_SS:
 714                 /* USB 3.0 hubs don't have a TT */
 715                 break;
 716         default:
 717                 debug("Unrecognized hub protocol %d\n",
 718                       dev->descriptor.bDeviceProtocol);
 719                 break;
 720         }
 721
 722         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
 723         switch (hubCharacteristics & HUB_CHAR_TTTT) {
 724         case HUB_TTTT_8_BITS:
 725                 if (dev->descriptor.bDeviceProtocol != 0) {
 726                         hub->tt.think_time = 666;
 727                         debug("TT requires at most %d FS bit times (%d ns)\n",
 728                               8, hub->tt.think_time);
 729                 }
 730                 break;
 731         case HUB_TTTT_16_BITS:
 732                 hub->tt.think_time = 666 * 2;
 733                 debug("TT requires at most %d FS bit times (%d ns)\n",
 734                       16, hub->tt.think_time);
 735                 break;
 736         case HUB_TTTT_24_BITS:
 737                 hub->tt.think_time = 666 * 3;
 738                 debug("TT requires at most %d FS bit times (%d ns)\n",
 739                       24, hub->tt.think_time);
 740                 break;
 741         case HUB_TTTT_32_BITS:
 742                 hub->tt.think_time = 666 * 4;
 743                 debug("TT requires at most %d FS bit times (%d ns)\n",
 744                       32, hub->tt.think_time);
 745                 break;
 746         }
 747
 748         debug("power on to power good time: %dms\n",
 749               descriptor->bPwrOn2PwrGood * 2);
 750         debug("hub controller current requirement: %dmA\n",
 751               descriptor->bHubContrCurrent);
 752
 753         for (i = 0; i < dev->maxchild; i++)
 754                 debug("port %d is%s removable\n", i + 1,
 755                       hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
 756                       (1 << ((i + 1) % 8)) ? " not" : "");
 757
 758         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
 759                 debug("usb_hub_configure: failed to get Status - " \
 760                       "too long: %d\n", descriptor->bLength);
 761                 return -EFBIG;
 762         }
 763
 764         ret = usb_get_hub_status(dev, buffer);
 765         if (ret < 0) {
 766                 debug("usb_hub_configure: failed to get Status %lX\n",
 767                       dev->status);
 768                 return ret;
 769         }
 770
 771         hubsts = (struct usb_hub_status *)buffer;
 772
 773         debug("get_hub_status returned status %X, change %X\n",
 774               le16_to_cpu(hubsts->wHubStatus),
 775               le16_to_cpu(hubsts->wHubChange));
 776         debug("local power source is %s\n",
 777               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
 778               "lost (inactive)" : "good");
 779         debug("%sover-current condition exists\n",
 780               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
 781               "" : "no ");
 782
 783 #if CONFIG_IS_ENABLED(DM_USB)
 784         /*
 785          * Update USB host controller's internal representation of this hub
 786          * after the hub descriptor is fetched.
 787          */
 788         ret = usb_update_hub_device(dev);
 789         if (ret < 0 && ret != -ENOSYS) {
 790                 debug("%s: failed to update hub device for HCD (%x)\n",
 791                       __func__, ret);
 792                 return ret;
 793         }
 794
 795         /*
 796          * A maximum of seven tiers are allowed in a USB topology, and the
 797          * root hub occupies the first tier. The last tier ends with a normal
 798          * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
 799          * to route packets to the designated downstream port. The hub uses a
 800          * hub depth value multiplied by four as an offset into the 'route
 801          * string' to locate the bits it uses to determine the downstream
 802          * port number.
 803          */
 804         if (usb_hub_is_root_hub(dev->dev)) {
 805                 hub->hub_depth = -1;
 806         } else {
 807                 struct udevice *hdev;
 808                 int depth = 0;
 809
 810                 hdev = dev->dev->parent;
 811                 while (!usb_hub_is_root_hub(hdev)) {
 812                         depth++;
 813                         hdev = hdev->parent;
 814                 }
 815
 816                 hub->hub_depth = depth;
 817
 818                 if (usb_hub_is_superspeed(dev)) {
 819                         debug("set hub (%p) depth to %d\n", dev, depth);
 820                         /*
 821                          * This request sets the value that the hub uses to
 822                          * determine the index into the 'route string index'
 823                          * for this hub.
 824                          */
 825                         ret = usb_set_hub_depth(dev, depth);
 826                         if (ret < 0) {
 827                                 debug("%s: failed to set hub depth (%lX)\n",
 828                                       __func__, dev->status);
 829                                 return ret;
 830                         }
 831                 }
 832         }
 833 #endif
 834
 835         usb_hub_power_on(hub);
 836
 837         /*
 838          * Reset any devices that may be in a bad state when applying
 839          * the power.  This is a __weak function.  Resetting of the devices
 840          * should occur in the board file of the device.
 841          */
 842         for (i = 0; i < dev->maxchild; i++)
 843                 usb_hub_reset_devices(hub, i + 1);
 844
 845         /*
 846          * Only add the connected USB devices, including potential hubs,
 847          * to a scanning list. This list will get scanned and devices that
 848          * are detected (either via port connected or via port timeout)
 849          * will get removed from this list. Scanning of the devices on this
 850          * list will continue until all devices are removed.
 851          */
 852         for (i = 0; i < dev->maxchild; i++) {
 853                 struct usb_device_scan *usb_scan;
 854
 855                 usb_scan = calloc(1, sizeof(*usb_scan));
 856                 if (!usb_scan) {
 857                         printf("Can't allocate memory for USB device!\n");
 858                         return -ENOMEM;
 859                 }
 860                 usb_scan->dev = dev;
 861                 usb_scan->hub = hub;
 862                 usb_scan->port = i;
 863                 list_add_tail(&usb_scan->list, &usb_scan_list);
 864         }
 865
 866         /*
 867          * And now call the scanning code which loops over the generated list
 868          */
 869         ret = usb_device_list_scan();
 870
 871         return ret;
 872 }
 873
 874 static int usb_hub_check(struct usb_device *dev, int ifnum)
 875 {
 876         struct usb_interface *iface;
 877         struct usb_endpoint_descriptor *ep = NULL;
 878
 879         iface = &dev->config.if_desc[ifnum];
 880         /* Is it a hub? */
 881         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
 882                 goto err;
 883         /* Some hubs have a subclass of 1, which AFAICT according to the */
 884         /*  specs is not defined, but it works */
 885         if ((iface->desc.bInterfaceSubClass != 0) &&
 886             (iface->desc.bInterfaceSubClass != 1))
 887                 goto err;
 888         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
 889         if (iface->desc.bNumEndpoints != 1)
 890                 goto err;
 891         ep = &iface->ep_desc[0];
 892         /* Output endpoint? Curiousier and curiousier.. */
 893         if (!(ep->bEndpointAddress & USB_DIR_IN))
 894                 goto err;
 895         /* If it's not an interrupt endpoint, we'd better punt! */
 896         if ((ep->bmAttributes & 3) != 3)
 897                 goto err;
 898         /* We found a hub */
 899         debug("USB hub found\n");
 900         return 0;
 901
 902 err:
 903         debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
 904               iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
 905               iface->desc.bNumEndpoints);
 906         if (ep) {
 907                 debug("   bEndpointAddress=%#x, bmAttributes=%d",
 908                       ep->bEndpointAddress, ep->bmAttributes);
 909         }
 910
 911         return -ENOENT;
 912 }
 913
 914 int usb_hub_probe(struct usb_device *dev, int ifnum)
 915 {
 916         int ret;
 917
 918         ret = usb_hub_check(dev, ifnum);
 919         if (ret)
 920                 return 0;
 921         ret = usb_hub_configure(dev);
 922         return ret;
 923 }
 924
 925 #if CONFIG_IS_ENABLED(DM_USB)
 926 int usb_hub_scan(struct udevice *hub)
 927 {
 928         struct usb_device *udev = dev_get_parent_priv(hub);
 929
 930         return usb_hub_configure(udev);
 931 }
 932
 933 static int usb_hub_post_probe(struct udevice *dev)
 934 {
 935         debug("%s\n", __func__);
 936         return usb_hub_scan(dev);
 937 }
 938
 939 static const struct udevice_id usb_hub_ids[] = {
 940         { .compatible = "usb-hub" },
 941         { }
 942 };
 943
 944 U_BOOT_DRIVER(usb_generic_hub) = {
 945         .name   = "usb_hub",
 946         .id     = UCLASS_USB_HUB,
 947         .of_match = usb_hub_ids,
 948         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 949 };
 950
 951 UCLASS_DRIVER(usb_hub) = {
 952         .id             = UCLASS_USB_HUB,
 953         .name           = "usb_hub",
 954         .post_bind      = dm_scan_fdt_dev,
 955         .post_probe     = usb_hub_post_probe,
 956         .child_pre_probe        = usb_child_pre_probe,
 957         .per_child_auto_alloc_size = sizeof(struct usb_device),
 958         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 959         .per_device_auto_alloc_size = sizeof(struct usb_hub_device),
 960 };
 961
 962 static const struct usb_device_id hub_id_table[] = {
 963         {
 964                 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
 965                 .bDeviceClass = USB_CLASS_HUB
 966         },
 967         { }     /* Terminating entry */
 968 };
 969
 970 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);
 971
 972 #endif