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 <asm/processor.h>
  28 #include <asm/unaligned.h>
  29 #include <linux/ctype.h>
  30 #include <asm/byteorder.h>
  31 #include <asm/unaligned.h>
  32
  33 #include <usb.h>
  34 #ifdef CONFIG_4xx
  35 #include <asm/4xx_pci.h>
  36 #endif
  37
  38 #define USB_BUFSIZ      512
  39
  40 static struct usb_hub_device hub_dev[USB_MAX_HUB];
  41 static int usb_hub_index;
  42
  43 __weak void usb_hub_reset_devices(int port)
  44 {
  45         return;
  46 }
  47
  48 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
  49 {
  50         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  51                 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  52                 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
  53 }
  54
  55 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
  56 {
  57         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  58                                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
  59                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  60 }
  61
  62 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
  63 {
  64         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  65                                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
  66                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  67 }
  68
  69 static int usb_get_hub_status(struct usb_device *dev, void *data)
  70 {
  71         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  72                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
  73                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
  74 }
  75
  76 static int usb_get_port_status(struct usb_device *dev, int port, void *data)
  77 {
  78         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  79                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
  80                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
  81 }
  82
  83
  84 static void usb_hub_power_on(struct usb_hub_device *hub)
  85 {
  86         int i;
  87         struct usb_device *dev;
  88         unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
  89         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
  90         unsigned short portstatus;
  91         int ret;
  92
  93         dev = hub->pusb_dev;
  94
  95         /*
  96          * Enable power to the ports:
  97          * Here we Power-cycle the ports: aka,
  98          * turning them off and turning on again.
  99          */
 100         debug("enabling power on all ports\n");
 101         for (i = 0; i < dev->maxchild; i++) {
 102                 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 103                 debug("port %d returns %lX\n", i + 1, dev->status);
 104         }
 105
 106         /* Wait at least 2*bPwrOn2PwrGood for PP to change */
 107         mdelay(pgood_delay);
 108
 109         for (i = 0; i < dev->maxchild; i++) {
 110                 ret = usb_get_port_status(dev, i + 1, portsts);
 111                 if (ret < 0) {
 112                         debug("port %d: get_port_status failed\n", i + 1);
 113                         continue;
 114                 }
 115
 116                 /*
 117                  * Check to confirm the state of Port Power:
 118                  * xHCI says "After modifying PP, s/w shall read
 119                  * PP and confirm that it has reached the desired state
 120                  * before modifying it again, undefined behavior may occur
 121                  * if this procedure is not followed".
 122                  * EHCI doesn't say anything like this, but no harm in keeping
 123                  * this.
 124                  */
 125                 portstatus = le16_to_cpu(portsts->wPortStatus);
 126                 if (portstatus & (USB_PORT_STAT_POWER << 1)) {
 127                         debug("port %d: Port power change failed\n", i + 1);
 128                         continue;
 129                 }
 130         }
 131
 132         for (i = 0; i < dev->maxchild; i++) {
 133                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 134                 debug("port %d returns %lX\n", i + 1, dev->status);
 135         }
 136
 137         /*
 138          * Wait for power to become stable,
 139          * plus spec-defined max time for device to connect
 140          */
 141         mdelay(pgood_delay + 1000);
 142 }
 143
 144 void usb_hub_reset(void)
 145 {
 146         usb_hub_index = 0;
 147 }
 148
 149 static struct usb_hub_device *usb_hub_allocate(void)
 150 {
 151         if (usb_hub_index < USB_MAX_HUB)
 152                 return &hub_dev[usb_hub_index++];
 153
 154         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
 155         return NULL;
 156 }
 157
 158 #define MAX_TRIES 5
 159
 160 static inline char *portspeed(int portstatus)
 161 {
 162         char *speed_str;
 163
 164         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 165         case USB_PORT_STAT_SUPER_SPEED:
 166                 speed_str = "5 Gb/s";
 167                 break;
 168         case USB_PORT_STAT_HIGH_SPEED:
 169                 speed_str = "480 Mb/s";
 170                 break;
 171         case USB_PORT_STAT_LOW_SPEED:
 172                 speed_str = "1.5 Mb/s";
 173                 break;
 174         default:
 175                 speed_str = "12 Mb/s";
 176                 break;
 177         }
 178
 179         return speed_str;
 180 }
 181
 182 int hub_port_reset(struct usb_device *dev, int port,
 183                         unsigned short *portstat)
 184 {
 185         int tries;
 186         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 187         unsigned short portstatus, portchange;
 188
 189         debug("hub_port_reset: resetting port %d...\n", port);
 190         for (tries = 0; tries < MAX_TRIES; tries++) {
 191
 192                 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 193                 mdelay(200);
 194
 195                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 196                         debug("get_port_status failed status %lX\n",
 197                               dev->status);
 198                         return -1;
 199                 }
 200                 portstatus = le16_to_cpu(portsts->wPortStatus);
 201                 portchange = le16_to_cpu(portsts->wPortChange);
 202
 203                 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
 204                                                         portspeed(portstatus));
 205
 206                 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
 207                       "  USB_PORT_STAT_ENABLE %d\n",
 208                       (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
 209                       (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
 210                       (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 211
 212                 /*
 213                  * Perhaps we should check for the following here:
 214                  * - C_CONNECTION hasn't been set.
 215                  * - CONNECTION is still set.
 216                  *
 217                  * Doing so would ensure that the device is still connected
 218                  * to the bus, and hasn't been unplugged or replaced while the
 219                  * USB bus reset was going on.
 220                  *
 221                  * However, if we do that, then (at least) a San Disk Ultra
 222                  * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
 223                  * Tegra Jetson TK1 board. For some reason, the device appears
 224                  * to briefly drop off the bus when this second bus reset is
 225                  * executed, yet if we retry this loop, it'll eventually come
 226                  * back after another reset or two.
 227                  */
 228
 229                 if (portstatus & USB_PORT_STAT_ENABLE)
 230                         break;
 231
 232                 mdelay(200);
 233         }
 234
 235         if (tries == MAX_TRIES) {
 236                 debug("Cannot enable port %i after %i retries, " \
 237                       "disabling port.\n", port + 1, MAX_TRIES);
 238                 debug("Maybe the USB cable is bad?\n");
 239                 return -1;
 240         }
 241
 242         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
 243         *portstat = portstatus;
 244         return 0;
 245 }
 246
 247
 248 void usb_hub_port_connect_change(struct usb_device *dev, int port)
 249 {
 250         struct usb_device *usb;
 251         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 252         unsigned short portstatus;
 253
 254         /* Check status */
 255         if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 256                 debug("get_port_status failed\n");
 257                 return;
 258         }
 259
 260         portstatus = le16_to_cpu(portsts->wPortStatus);
 261         debug("portstatus %x, change %x, %s\n",
 262               portstatus,
 263               le16_to_cpu(portsts->wPortChange),
 264               portspeed(portstatus));
 265
 266         /* Clear the connection change status */
 267         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
 268
 269         /* Disconnect any existing devices under this port */
 270         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
 271              (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
 272                 debug("usb_disconnect(&hub->children[port]);\n");
 273                 /* Return now if nothing is connected */
 274                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
 275                         return;
 276         }
 277         mdelay(200);
 278
 279         /* Reset the port */
 280         if (hub_port_reset(dev, port, &portstatus) < 0) {
 281                 printf("cannot reset port %i!?\n", port + 1);
 282                 return;
 283         }
 284
 285         mdelay(200);
 286
 287         /* Allocate a new device struct for it */
 288         usb = usb_alloc_new_device(dev->controller);
 289
 290         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
 291         case USB_PORT_STAT_SUPER_SPEED:
 292                 usb->speed = USB_SPEED_SUPER;
 293                 break;
 294         case USB_PORT_STAT_HIGH_SPEED:
 295                 usb->speed = USB_SPEED_HIGH;
 296                 break;
 297         case USB_PORT_STAT_LOW_SPEED:
 298                 usb->speed = USB_SPEED_LOW;
 299                 break;
 300         default:
 301                 usb->speed = USB_SPEED_FULL;
 302                 break;
 303         }
 304
 305         dev->children[port] = usb;
 306         usb->parent = dev;
 307         usb->portnr = port + 1;
 308         /* Run it through the hoops (find a driver, etc) */
 309         if (usb_new_device(usb)) {
 310                 /* Woops, disable the port */
 311                 usb_free_device();
 312                 dev->children[port] = NULL;
 313                 debug("hub: disabling port %d\n", port + 1);
 314                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
 315         }
 316 }
 317
 318
 319 static int usb_hub_configure(struct usb_device *dev)
 320 {
 321         int i, length;
 322         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
 323         unsigned char *bitmap;
 324         short hubCharacteristics;
 325         struct usb_hub_descriptor *descriptor;
 326         struct usb_hub_device *hub;
 327         __maybe_unused struct usb_hub_status *hubsts;
 328
 329         /* "allocate" Hub device */
 330         hub = usb_hub_allocate();
 331         if (hub == NULL)
 332                 return -1;
 333         hub->pusb_dev = dev;
 334         /* Get the the hub descriptor */
 335         if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
 336                 debug("usb_hub_configure: failed to get hub " \
 337                       "descriptor, giving up %lX\n", dev->status);
 338                 return -1;
 339         }
 340         descriptor = (struct usb_hub_descriptor *)buffer;
 341
 342         length = min(descriptor->bLength, sizeof(struct usb_hub_descriptor));
 343
 344         if (usb_get_hub_descriptor(dev, buffer, length) < 0) {
 345                 debug("usb_hub_configure: failed to get hub " \
 346                       "descriptor 2nd giving up %lX\n", dev->status);
 347                 return -1;
 348         }
 349         memcpy((unsigned char *)&hub->desc, buffer, length);
 350         /* adjust 16bit values */
 351         put_unaligned(le16_to_cpu(get_unaligned(
 352                         &descriptor->wHubCharacteristics)),
 353                         &hub->desc.wHubCharacteristics);
 354         /* set the bitmap */
 355         bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
 356         /* devices not removable by default */
 357         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
 358         bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
 359         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
 360
 361         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 362                 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
 363
 364         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 365                 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
 366
 367         dev->maxchild = descriptor->bNbrPorts;
 368         debug("%d ports detected\n", dev->maxchild);
 369
 370         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
 371         switch (hubCharacteristics & HUB_CHAR_LPSM) {
 372         case 0x00:
 373                 debug("ganged power switching\n");
 374                 break;
 375         case 0x01:
 376                 debug("individual port power switching\n");
 377                 break;
 378         case 0x02:
 379         case 0x03:
 380                 debug("unknown reserved power switching mode\n");
 381                 break;
 382         }
 383
 384         if (hubCharacteristics & HUB_CHAR_COMPOUND)
 385                 debug("part of a compound device\n");
 386         else
 387                 debug("standalone hub\n");
 388
 389         switch (hubCharacteristics & HUB_CHAR_OCPM) {
 390         case 0x00:
 391                 debug("global over-current protection\n");
 392                 break;
 393         case 0x08:
 394                 debug("individual port over-current protection\n");
 395                 break;
 396         case 0x10:
 397         case 0x18:
 398                 debug("no over-current protection\n");
 399                 break;
 400         }
 401
 402         debug("power on to power good time: %dms\n",
 403               descriptor->bPwrOn2PwrGood * 2);
 404         debug("hub controller current requirement: %dmA\n",
 405               descriptor->bHubContrCurrent);
 406
 407         for (i = 0; i < dev->maxchild; i++)
 408                 debug("port %d is%s removable\n", i + 1,
 409                       hub->desc.DeviceRemovable[(i + 1) / 8] & \
 410                       (1 << ((i + 1) % 8)) ? " not" : "");
 411
 412         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
 413                 debug("usb_hub_configure: failed to get Status - " \
 414                       "too long: %d\n", descriptor->bLength);
 415                 return -1;
 416         }
 417
 418         if (usb_get_hub_status(dev, buffer) < 0) {
 419                 debug("usb_hub_configure: failed to get Status %lX\n",
 420                       dev->status);
 421                 return -1;
 422         }
 423
 424 #ifdef DEBUG
 425         hubsts = (struct usb_hub_status *)buffer;
 426 #endif
 427
 428         debug("get_hub_status returned status %X, change %X\n",
 429               le16_to_cpu(hubsts->wHubStatus),
 430               le16_to_cpu(hubsts->wHubChange));
 431         debug("local power source is %s\n",
 432               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
 433               "lost (inactive)" : "good");
 434         debug("%sover-current condition exists\n",
 435               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
 436               "" : "no ");
 437         usb_hub_power_on(hub);
 438
 439         /*
 440          * Reset any devices that may be in a bad state when applying
 441          * the power.  This is a __weak function.  Resetting of the devices
 442          * should occur in the board file of the device.
 443          */
 444         for (i = 0; i < dev->maxchild; i++)
 445                 usb_hub_reset_devices(i + 1);
 446
 447         for (i = 0; i < dev->maxchild; i++) {
 448                 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 449                 unsigned short portstatus, portchange;
 450                 int ret;
 451                 ulong start = get_timer(0);
 452
 453                 /*
 454                  * Wait for (whichever finishes first)
 455                  *  - A maximum of 10 seconds
 456                  *    This is a purely observational value driven by connecting
 457                  *    a few broken pen drives and taking the max * 1.5 approach
 458                  *  - connection_change and connection state to report same
 459                  *    state
 460                  */
 461                 do {
 462                         ret = usb_get_port_status(dev, i + 1, portsts);
 463                         if (ret < 0) {
 464                                 debug("get_port_status failed\n");
 465                                 break;
 466                         }
 467
 468                         portstatus = le16_to_cpu(portsts->wPortStatus);
 469                         portchange = le16_to_cpu(portsts->wPortChange);
 470
 471                         if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
 472                                 (portstatus & USB_PORT_STAT_CONNECTION))
 473                                 break;
 474
 475                 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
 476
 477                 if (ret < 0)
 478                         continue;
 479
 480                 debug("Port %d Status %X Change %X\n",
 481                       i + 1, portstatus, portchange);
 482
 483                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
 484                         debug("port %d connection change\n", i + 1);
 485                         usb_hub_port_connect_change(dev, i);
 486                 }
 487                 if (portchange & USB_PORT_STAT_C_ENABLE) {
 488                         debug("port %d enable change, status %x\n",
 489                               i + 1, portstatus);
 490                         usb_clear_port_feature(dev, i + 1,
 491                                                 USB_PORT_FEAT_C_ENABLE);
 492                         /*
 493                          * The following hack causes a ghost device problem
 494                          * to Faraday EHCI
 495                          */
 496 #ifndef CONFIG_USB_EHCI_FARADAY
 497                         /* EM interference sometimes causes bad shielded USB
 498                          * devices to be shutdown by the hub, this hack enables
 499                          * them again. Works at least with mouse driver */
 500                         if (!(portstatus & USB_PORT_STAT_ENABLE) &&
 501                              (portstatus & USB_PORT_STAT_CONNECTION) &&
 502                              ((dev->children[i]))) {
 503                                 debug("already running port %i "  \
 504                                       "disabled by hub (EMI?), " \
 505                                       "re-enabling...\n", i + 1);
 506                                       usb_hub_port_connect_change(dev, i);
 507                         }
 508 #endif
 509                 }
 510                 if (portstatus & USB_PORT_STAT_SUSPEND) {
 511                         debug("port %d suspend change\n", i + 1);
 512                         usb_clear_port_feature(dev, i + 1,
 513                                                 USB_PORT_FEAT_SUSPEND);
 514                 }
 515
 516                 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
 517                         debug("port %d over-current change\n", i + 1);
 518                         usb_clear_port_feature(dev, i + 1,
 519                                                 USB_PORT_FEAT_C_OVER_CURRENT);
 520                         usb_hub_power_on(hub);
 521                 }
 522
 523                 if (portchange & USB_PORT_STAT_C_RESET) {
 524                         debug("port %d reset change\n", i + 1);
 525                         usb_clear_port_feature(dev, i + 1,
 526                                                 USB_PORT_FEAT_C_RESET);
 527                 }
 528         } /* end for i all ports */
 529
 530         return 0;
 531 }
 532
 533 int usb_hub_probe(struct usb_device *dev, int ifnum)
 534 {
 535         struct usb_interface *iface;
 536         struct usb_endpoint_descriptor *ep;
 537         int ret;
 538
 539         iface = &dev->config.if_desc[ifnum];
 540         /* Is it a hub? */
 541         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
 542                 return 0;
 543         /* Some hubs have a subclass of 1, which AFAICT according to the */
 544         /*  specs is not defined, but it works */
 545         if ((iface->desc.bInterfaceSubClass != 0) &&
 546             (iface->desc.bInterfaceSubClass != 1))
 547                 return 0;
 548         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
 549         if (iface->desc.bNumEndpoints != 1)
 550                 return 0;
 551         ep = &iface->ep_desc[0];
 552         /* Output endpoint? Curiousier and curiousier.. */
 553         if (!(ep->bEndpointAddress & USB_DIR_IN))
 554                 return 0;
 555         /* If it's not an interrupt endpoint, we'd better punt! */
 556         if ((ep->bmAttributes & 3) != 3)
 557                 return 0;
 558         /* We found a hub */
 559         debug("USB hub found\n");
 560         ret = usb_hub_configure(dev);
 561         return ret;
 562 }