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