drivers/usb/host/usb-uclass.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * usb_match_device() modified from Linux kernel v4.0.
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <usb.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/lists.h>
  16 #include <dm/root.h>
  17 #include <dm/uclass-internal.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 extern bool usb_started; /* flag for the started/stopped USB status */
  22 static bool asynch_allowed;
  23
  24 int usb_disable_asynch(int disable)
  25 {
  26         int old_value = asynch_allowed;
  27
  28         asynch_allowed = !disable;
  29         return old_value;
  30 }
  31
  32 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  33                    int length, int interval)
  34 {
  35         struct udevice *bus = udev->controller_dev;
  36         struct dm_usb_ops *ops = usb_get_ops(bus);
  37
  38         if (!ops->interrupt)
  39                 return -ENOSYS;
  40
  41         return ops->interrupt(bus, udev, pipe, buffer, length, interval);
  42 }
  43
  44 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  45                        void *buffer, int length, struct devrequest *setup)
  46 {
  47         struct udevice *bus = udev->controller_dev;
  48         struct dm_usb_ops *ops = usb_get_ops(bus);
  49
  50         if (!ops->control)
  51                 return -ENOSYS;
  52
  53         return ops->control(bus, udev, pipe, buffer, length, setup);
  54 }
  55
  56 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  57                     int length)
  58 {
  59         struct udevice *bus = udev->controller_dev;
  60         struct dm_usb_ops *ops = usb_get_ops(bus);
  61
  62         if (!ops->bulk)
  63                 return -ENOSYS;
  64
  65         return ops->bulk(bus, udev, pipe, buffer, length);
  66 }
  67
  68 int usb_alloc_device(struct usb_device *udev)
  69 {
  70         struct udevice *bus = udev->controller_dev;
  71         struct dm_usb_ops *ops = usb_get_ops(bus);
  72
  73         /* This is only requird by some controllers - current XHCI */
  74         if (!ops->alloc_device)
  75                 return 0;
  76
  77         return ops->alloc_device(bus, udev);
  78 }
  79
  80 int usb_stop(void)
  81 {
  82         struct udevice *bus;
  83         struct uclass *uc;
  84         int err = 0, ret;
  85
  86         /* De-activate any devices that have been activated */
  87         ret = uclass_get(UCLASS_USB, &uc);
  88         if (ret)
  89                 return ret;
  90         uclass_foreach_dev(bus, uc) {
  91                 ret = device_remove(bus);
  92                 if (ret && !err)
  93                         err = ret;
  94         }
  95
  96 #ifdef CONFIG_SANDBOX
  97         struct udevice *dev;
  98
  99         /* Reset all enulation devices */
 100         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 101         if (ret)
 102                 return ret;
 103
 104         uclass_foreach_dev(dev, uc)
 105                 usb_emul_reset(dev);
 106 #endif
 107         usb_stor_reset();
 108         usb_hub_reset();
 109         usb_started = 0;
 110
 111         return err;
 112 }
 113
 114 static int usb_scan_bus(struct udevice *bus, bool recurse)
 115 {
 116         struct usb_bus_priv *priv;
 117         struct udevice *dev;
 118         int ret;
 119
 120         priv = dev_get_uclass_priv(bus);
 121
 122         assert(recurse);        /* TODO: Support non-recusive */
 123
 124         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 125         if (ret)
 126                 return ret;
 127
 128         return priv->next_addr;
 129 }
 130
 131 int usb_init(void)
 132 {
 133         int controllers_initialized = 0;
 134         struct udevice *bus;
 135         struct uclass *uc;
 136         int count = 0;
 137         int ret;
 138
 139         asynch_allowed = 1;
 140         usb_hub_reset();
 141
 142         ret = uclass_get(UCLASS_USB, &uc);
 143         if (ret)
 144                 return ret;
 145
 146         uclass_foreach_dev(bus, uc) {
 147                 /* init low_level USB */
 148                 printf("USB%d:   ", count);
 149                 count++;
 150                 ret = device_probe(bus);
 151                 if (ret == -ENODEV) {   /* No such device. */
 152                         puts("Port not available.\n");
 153                         controllers_initialized++;
 154                         continue;
 155                 }
 156
 157                 if (ret) {              /* Other error. */
 158                         printf("probe failed, error %d\n", ret);
 159                         continue;
 160                 }
 161                 /*
 162                  * lowlevel init is OK, now scan the bus for devices
 163                  * i.e. search HUBs and configure them
 164                  */
 165                 controllers_initialized++;
 166                 printf("scanning bus %d for devices... ", bus->seq);
 167                 debug("\n");
 168                 ret = usb_scan_bus(bus, true);
 169                 if (ret < 0)
 170                         printf("failed, error %d\n", ret);
 171                 else if (!ret)
 172                         printf("No USB Device found\n");
 173                 else
 174                         printf("%d USB Device(s) found\n", ret);
 175                 usb_started = true;
 176         }
 177
 178         debug("scan end\n");
 179         /* if we were not able to find at least one working bus, bail out */
 180         if (!count)
 181                 printf("No controllers found\n");
 182         else if (controllers_initialized == 0)
 183                 printf("USB error: all controllers failed lowlevel init\n");
 184
 185         return usb_started ? 0 : -1;
 186 }
 187
 188 int usb_reset_root_port(void)
 189 {
 190         return -ENOSYS;
 191 }
 192
 193 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 194 {
 195         struct usb_device *udev;
 196         struct udevice *dev;
 197
 198         if (!device_active(parent))
 199                 return NULL;
 200         udev = dev_get_parentdata(parent);
 201         if (udev->devnum == devnum)
 202                 return udev;
 203
 204         for (device_find_first_child(parent, &dev);
 205              dev;
 206              device_find_next_child(&dev)) {
 207                 udev = find_child_devnum(dev, devnum);
 208                 if (udev)
 209                         return udev;
 210         }
 211
 212         return NULL;
 213 }
 214
 215 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 216 {
 217         struct udevice *hub;
 218         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 219
 220         device_find_first_child(bus, &hub);
 221         if (device_get_uclass_id(hub) == UCLASS_USB_HUB)
 222                 return find_child_devnum(hub, devnum);
 223
 224         return NULL;
 225 }
 226
 227 int usb_post_bind(struct udevice *dev)
 228 {
 229         /* Scan the bus for devices */
 230         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 231 }
 232
 233 int usb_port_reset(struct usb_device *parent, int portnr)
 234 {
 235         unsigned short portstatus;
 236         int ret;
 237
 238         debug("%s: start\n", __func__);
 239
 240         if (parent) {
 241                 /* reset the port for the second time */
 242                 assert(portnr > 0);
 243                 debug("%s: reset %d\n", __func__, portnr - 1);
 244                 ret = legacy_hub_port_reset(parent, portnr - 1, &portstatus);
 245                 if (ret < 0) {
 246                         printf("\n     Couldn't reset port %i\n", portnr);
 247                         return ret;
 248                 }
 249         } else {
 250                 debug("%s: reset root\n", __func__);
 251                 usb_reset_root_port();
 252         }
 253
 254         return 0;
 255 }
 256
 257 int usb_legacy_port_reset(struct usb_device *parent, int portnr)
 258 {
 259         return usb_port_reset(parent, portnr);
 260 }
 261
 262 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 263 {
 264         struct usb_platdata *plat;
 265         struct udevice *dev;
 266         int ret;
 267
 268         /* Find the old device and remove it */
 269         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 270         if (ret)
 271                 return ret;
 272         ret = device_remove(dev);
 273         if (ret)
 274                 return ret;
 275
 276         plat = dev_get_platdata(dev);
 277         plat->init_type = USB_INIT_DEVICE;
 278         ret = device_probe(dev);
 279         if (ret)
 280                 return ret;
 281         *ctlrp = dev_get_priv(dev);
 282
 283         return 0;
 284 }
 285
 286 /* returns 0 if no match, 1 if match */
 287 int usb_match_device(const struct usb_device_descriptor *desc,
 288                      const struct usb_device_id *id)
 289 {
 290         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 291             id->idVendor != le16_to_cpu(desc->idVendor))
 292                 return 0;
 293
 294         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 295             id->idProduct != le16_to_cpu(desc->idProduct))
 296                 return 0;
 297
 298         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 299            greater than any unsigned number. */
 300         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 301             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 302                 return 0;
 303
 304         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 305             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 306                 return 0;
 307
 308         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 309             (id->bDeviceClass != desc->bDeviceClass))
 310                 return 0;
 311
 312         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 313             (id->bDeviceSubClass != desc->bDeviceSubClass))
 314                 return 0;
 315
 316         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 317             (id->bDeviceProtocol != desc->bDeviceProtocol))
 318                 return 0;
 319
 320         return 1;
 321 }
 322
 323 /* returns 0 if no match, 1 if match */
 324 int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 325                           const struct usb_interface_descriptor *int_desc,
 326                           const struct usb_device_id *id)
 327 {
 328         /* The interface class, subclass, protocol and number should never be
 329          * checked for a match if the device class is Vendor Specific,
 330          * unless the match record specifies the Vendor ID. */
 331         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 332             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 333             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 334                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 335                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 336                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 337                 return 0;
 338
 339         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 340             (id->bInterfaceClass != int_desc->bInterfaceClass))
 341                 return 0;
 342
 343         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 344             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 345                 return 0;
 346
 347         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 348             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 349                 return 0;
 350
 351         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 352             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 353                 return 0;
 354
 355         return 1;
 356 }
 357
 358 /* returns 0 if no match, 1 if match */
 359 int usb_match_one_id(struct usb_device_descriptor *desc,
 360                      struct usb_interface_descriptor *int_desc,
 361                      const struct usb_device_id *id)
 362 {
 363         if (!usb_match_device(desc, id))
 364                 return 0;
 365
 366         return usb_match_one_id_intf(desc, int_desc, id);
 367 }
 368
 369 /**
 370  * usb_find_and_bind_driver() - Find and bind the right USB driver
 371  *
 372  * This only looks at certain fields in the descriptor.
 373  */
 374 static int usb_find_and_bind_driver(struct udevice *parent,
 375                                     struct usb_device_descriptor *desc,
 376                                     struct usb_interface_descriptor *iface,
 377                                     int bus_seq, int devnum,
 378                                     struct udevice **devp)
 379 {
 380         struct usb_driver_entry *start, *entry;
 381         int n_ents;
 382         int ret;
 383         char name[30], *str;
 384
 385         *devp = NULL;
 386         debug("%s: Searching for driver\n", __func__);
 387         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 388         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 389         for (entry = start; entry != start + n_ents; entry++) {
 390                 const struct usb_device_id *id;
 391                 struct udevice *dev;
 392                 const struct driver *drv;
 393                 struct usb_dev_platdata *plat;
 394
 395                 for (id = entry->match; id->match_flags; id++) {
 396                         if (!usb_match_one_id(desc, iface, id))
 397                                 continue;
 398
 399                         drv = entry->driver;
 400                         /*
 401                          * We could pass the descriptor to the driver as
 402                          * platdata (instead of NULL) and allow its bind()
 403                          * method to return -ENOENT if it doesn't support this
 404                          * device. That way we could continue the search to
 405                          * find another driver. For now this doesn't seem
 406                          * necesssary, so just bind the first match.
 407                          */
 408                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 409                                           &dev);
 410                         if (ret)
 411                                 goto error;
 412                         debug("%s: Match found: %s\n", __func__, drv->name);
 413                         dev->driver_data = id->driver_info;
 414                         plat = dev_get_parent_platdata(dev);
 415                         plat->id = *id;
 416                         *devp = dev;
 417                         return 0;
 418                 }
 419         }
 420
 421         /* Bind a generic driver so that the device can be used */
 422         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 423         str = strdup(name);
 424         if (!str)
 425                 return -ENOMEM;
 426         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 427
 428 error:
 429         debug("%s: No match found: %d\n", __func__, ret);
 430         return ret;
 431 }
 432
 433 /**
 434  * usb_find_child() - Find an existing device which matches our needs
 435  *
 436  *
 437  */
 438 static int usb_find_child(struct udevice *parent,
 439                           struct usb_device_descriptor *desc,
 440                           struct usb_interface_descriptor *iface,
 441                           struct udevice **devp)
 442 {
 443         struct udevice *dev;
 444
 445         *devp = NULL;
 446         for (device_find_first_child(parent, &dev);
 447              dev;
 448              device_find_next_child(&dev)) {
 449                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 450
 451                 /* If this device is already in use, skip it */
 452                 if (device_active(dev))
 453                         continue;
 454                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 455                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 456                 if (usb_match_one_id(desc, iface, &plat->id)) {
 457                         *devp = dev;
 458                         return 0;
 459                 }
 460         }
 461
 462         return -ENOENT;
 463 }
 464
 465 int usb_scan_device(struct udevice *parent, int port,
 466                     enum usb_device_speed speed, struct udevice **devp)
 467 {
 468         struct udevice *dev;
 469         bool created = false;
 470         struct usb_dev_platdata *plat;
 471         struct usb_bus_priv *priv;
 472         struct usb_device *parent_udev;
 473         int ret;
 474         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 475         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 476
 477         *devp = NULL;
 478         memset(udev, '\0', sizeof(*udev));
 479         udev->controller_dev = usb_get_bus(parent);
 480         priv = dev_get_uclass_priv(udev->controller_dev);
 481
 482         /*
 483          * Somewhat nasty, this. We create a local device and use the normal
 484          * USB stack to read its descriptor. Then we know what type of device
 485          * to create for real.
 486          *
 487          * udev->dev is set to the parent, since we don't have a real device
 488          * yet. The USB stack should not access udev.dev anyway, except perhaps
 489          * to find the controller, and the controller will either be @parent,
 490          * or some parent of @parent.
 491          *
 492          * Another option might be to create the device as a generic USB
 493          * device, then morph it into the correct one when we know what it
 494          * should be. This means that a generic USB device would morph into
 495          * a network controller, or a USB flash stick, for example. However,
 496          * we don't support such morphing and it isn't clear that it would
 497          * be easy to do.
 498          *
 499          * Yet another option is to split out the USB stack parts of udev
 500          * into something like a 'struct urb' (as Linux does) which can exist
 501          * independently of any device. This feels cleaner, but calls for quite
 502          * a big change to the USB stack.
 503          *
 504          * For now, the approach is to set up an empty udev, read its
 505          * descriptor and assign it an address, then bind a real device and
 506          * stash the resulting information into the device's parent
 507          * platform data. Then when we probe it, usb_child_pre_probe() is called
 508          * and it will pull the information out of the stash.
 509          */
 510         udev->dev = parent;
 511         udev->speed = speed;
 512         udev->devnum = priv->next_addr + 1;
 513         udev->portnr = port;
 514         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 515         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 516                 dev_get_parentdata(parent) : NULL;
 517         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev, port);
 518         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 519         if (ret)
 520                 return ret;
 521         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 522         debug("** usb_find_child returns %d\n", ret);
 523         if (ret) {
 524                 if (ret != -ENOENT)
 525                         return ret;
 526                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 527                                                udev->controller_dev->seq,
 528                                                udev->devnum, &dev);
 529                 if (ret)
 530                         return ret;
 531                 created = true;
 532         }
 533         plat = dev_get_parent_platdata(dev);
 534         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 535         plat->devnum = udev->devnum;
 536         plat->speed = udev->speed;
 537         plat->slot_id = udev->slot_id;
 538         plat->portnr = port;
 539         debug("** device '%s': stashing slot_id=%d\n", dev->name,
 540               plat->slot_id);
 541         priv->next_addr++;
 542         ret = device_probe(dev);
 543         if (ret) {
 544                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 545                 priv->next_addr--;
 546                 if (created)
 547                         device_unbind(dev);
 548                 return ret;
 549         }
 550         *devp = dev;
 551
 552         return 0;
 553 }
 554
 555 int usb_child_post_bind(struct udevice *dev)
 556 {
 557         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 558         const void *blob = gd->fdt_blob;
 559         int val;
 560
 561         if (dev->of_offset == -1)
 562                 return 0;
 563
 564         /* We only support matching a few things */
 565         val = fdtdec_get_int(blob, dev->of_offset, "usb,device-class", -1);
 566         if (val != -1) {
 567                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 568                 plat->id.bDeviceClass = val;
 569         }
 570         val = fdtdec_get_int(blob, dev->of_offset, "usb,interface-class", -1);
 571         if (val != -1) {
 572                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 573                 plat->id.bInterfaceClass = val;
 574         }
 575
 576         return 0;
 577 }
 578
 579 struct udevice *usb_get_bus(struct udevice *dev)
 580 {
 581         struct udevice *bus;
 582
 583         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 584                 bus = bus->parent;
 585         if (!bus) {
 586                 /* By design this cannot happen */
 587                 assert(bus);
 588                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 589         }
 590
 591         return bus;
 592 }
 593
 594 int usb_child_pre_probe(struct udevice *dev)
 595 {
 596         struct usb_device *udev = dev_get_parentdata(dev);
 597         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 598         int ret;
 599
 600         udev->controller_dev = usb_get_bus(dev);
 601         udev->dev = dev;
 602         udev->devnum = plat->devnum;
 603         udev->slot_id = plat->slot_id;
 604         udev->portnr = plat->portnr;
 605         udev->speed = plat->speed;
 606         debug("** device '%s': getting slot_id=%d\n", dev->name, plat->slot_id);
 607
 608         ret = usb_select_config(udev);
 609         if (ret)
 610                 return ret;
 611
 612         return 0;
 613 }
 614
 615 UCLASS_DRIVER(usb) = {
 616         .id             = UCLASS_USB,
 617         .name           = "usb",
 618         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 619         .post_bind      = usb_post_bind,
 620         .per_child_auto_alloc_size = sizeof(struct usb_device),
 621         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 622         .child_post_bind = usb_child_post_bind,
 623         .child_pre_probe = usb_child_pre_probe,
 624         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 625 };
 626
 627 UCLASS_DRIVER(usb_dev_generic) = {
 628         .id             = UCLASS_USB_DEV_GENERIC,
 629         .name           = "usb_dev_generic",
 630 };
 631
 632 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 633         .id             = UCLASS_USB_DEV_GENERIC,
 634         .name           = "usb_dev_generic_drv",
 635 };