1 /* 2 * Most of this source has been derived from the Linux USB 3 * project: 4 * (C) Copyright Linus Torvalds 1999 5 * (C) Copyright Johannes Erdfelt 1999-2001 6 * (C) Copyright Andreas Gal 1999 7 * (C) Copyright Gregory P. Smith 1999 8 * (C) Copyright Deti Fliegl 1999 (new USB architecture) 9 * (C) Copyright Randy Dunlap 2000 10 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id) 11 * (C) Copyright Yggdrasil Computing, Inc. 2000 12 * (usb_device_id matching changes by Adam J. Richter) 13 * 14 * Adapted for U-Boot: 15 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland 16 * 17 * SPDX-License-Identifier: GPL-2.0+ 18 */ 19 20 /**************************************************************************** 21 * HUB "Driver" 22 * Probes device for being a hub and configurate it 23 */ 24 25 #include <common.h> 26 #include <command.h> 27 #include <dm.h> 28 #include <errno.h> 29 #include <memalign.h> 30 #include <asm/processor.h> 31 #include <asm/unaligned.h> 32 #include <linux/ctype.h> 33 #include <linux/list.h> 34 #include <asm/byteorder.h> 35 #ifdef CONFIG_SANDBOX 36 #include <asm/state.h> 37 #endif 38 #include <asm/unaligned.h> 39 #include <dm/root.h> 40 41 DECLARE_GLOBAL_DATA_PTR; 42 43 #include <usb.h> 44 #ifdef CONFIG_4xx 45 #include <asm/4xx_pci.h> 46 #endif 47 48 #define USB_BUFSIZ 512 49 50 #define HUB_SHORT_RESET_TIME 20 51 #define HUB_LONG_RESET_TIME 200 52 53 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3 54 55 struct usb_device_scan { 56 struct usb_device *dev; /* USB hub device to scan */ 57 struct usb_hub_device *hub; /* USB hub struct */ 58 int port; /* USB port to scan */ 59 struct list_head list; 60 }; 61 62 /* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */ 63 static struct usb_hub_device hub_dev[USB_MAX_HUB]; 64 static int usb_hub_index; 65 static LIST_HEAD(usb_scan_list); 66 67 __weak void usb_hub_reset_devices(int port) 68 { 69 return; 70 } 71 72 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size) 73 { 74 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 75 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 76 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT); 77 } 78 79 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature) 80 { 81 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 82 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, 83 port, NULL, 0, USB_CNTL_TIMEOUT); 84 } 85 86 static int usb_set_port_feature(struct usb_device *dev, int port, int feature) 87 { 88 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 89 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, 90 port, NULL, 0, USB_CNTL_TIMEOUT); 91 } 92 93 static int usb_get_hub_status(struct usb_device *dev, void *data) 94 { 95 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 96 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 97 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT); 98 } 99 100 int usb_get_port_status(struct usb_device *dev, int port, void *data) 101 { 102 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 103 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port, 104 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT); 105 } 106 107 108 static void usb_hub_power_on(struct usb_hub_device *hub) 109 { 110 int i; 111 struct usb_device *dev; 112 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2; 113 const char *env; 114 115 dev = hub->pusb_dev; 116 117 debug("enabling power on all ports\n"); 118 for (i = 0; i < dev->maxchild; i++) { 119 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 120 debug("port %d returns %lX\n", i + 1, dev->status); 121 } 122 123 #ifdef CONFIG_SANDBOX 124 /* 125 * Don't set timeout / delay values here. This results 126 * in these values still being reset to 0. 127 */ 128 if (state_get_skip_delays()) 129 return; 130 #endif 131 132 /* 133 * Wait for power to become stable, 134 * plus spec-defined max time for device to connect 135 * but allow this time to be increased via env variable as some 136 * devices break the spec and require longer warm-up times 137 */ 138 env = getenv("usb_pgood_delay"); 139 if (env) 140 pgood_delay = max(pgood_delay, 141 (unsigned)simple_strtol(env, NULL, 0)); 142 debug("pgood_delay=%dms\n", pgood_delay); 143 144 /* 145 * Do a minimum delay of the larger value of 100ms or pgood_delay 146 * so that the power can stablize before the devices are queried 147 */ 148 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay); 149 150 /* 151 * Record the power-on timeout here. The max. delay (timeout) 152 * will be done based on this value in the USB port loop in 153 * usb_hub_configure() later. 154 */ 155 hub->connect_timeout = hub->query_delay + 1000; 156 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n", 157 dev->devnum, max(100, (int)pgood_delay), 158 max(100, (int)pgood_delay) + 1000); 159 } 160 161 void usb_hub_reset(void) 162 { 163 usb_hub_index = 0; 164 165 /* Zero out global hub_dev in case its re-used again */ 166 memset(hub_dev, 0, sizeof(hub_dev)); 167 } 168 169 static struct usb_hub_device *usb_hub_allocate(void) 170 { 171 if (usb_hub_index < USB_MAX_HUB) 172 return &hub_dev[usb_hub_index++]; 173 174 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB); 175 return NULL; 176 } 177 178 #define MAX_TRIES 5 179 180 static inline char *portspeed(int portstatus) 181 { 182 char *speed_str; 183 184 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 185 case USB_PORT_STAT_SUPER_SPEED: 186 speed_str = "5 Gb/s"; 187 break; 188 case USB_PORT_STAT_HIGH_SPEED: 189 speed_str = "480 Mb/s"; 190 break; 191 case USB_PORT_STAT_LOW_SPEED: 192 speed_str = "1.5 Mb/s"; 193 break; 194 default: 195 speed_str = "12 Mb/s"; 196 break; 197 } 198 199 return speed_str; 200 } 201 202 int legacy_hub_port_reset(struct usb_device *dev, int port, 203 unsigned short *portstat) 204 { 205 int err, tries; 206 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 207 unsigned short portstatus, portchange; 208 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */ 209 210 #ifdef CONFIG_DM_USB 211 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name, 212 port + 1); 213 #else 214 debug("%s: resetting port %d...\n", __func__, port + 1); 215 #endif 216 for (tries = 0; tries < MAX_TRIES; tries++) { 217 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET); 218 if (err < 0) 219 return err; 220 221 mdelay(delay); 222 223 if (usb_get_port_status(dev, port + 1, portsts) < 0) { 224 debug("get_port_status failed status %lX\n", 225 dev->status); 226 return -1; 227 } 228 portstatus = le16_to_cpu(portsts->wPortStatus); 229 portchange = le16_to_cpu(portsts->wPortChange); 230 231 debug("portstatus %x, change %x, %s\n", portstatus, portchange, 232 portspeed(portstatus)); 233 234 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \ 235 " USB_PORT_STAT_ENABLE %d\n", 236 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0, 237 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0, 238 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0); 239 240 /* 241 * Perhaps we should check for the following here: 242 * - C_CONNECTION hasn't been set. 243 * - CONNECTION is still set. 244 * 245 * Doing so would ensure that the device is still connected 246 * to the bus, and hasn't been unplugged or replaced while the 247 * USB bus reset was going on. 248 * 249 * However, if we do that, then (at least) a San Disk Ultra 250 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA 251 * Tegra Jetson TK1 board. For some reason, the device appears 252 * to briefly drop off the bus when this second bus reset is 253 * executed, yet if we retry this loop, it'll eventually come 254 * back after another reset or two. 255 */ 256 257 if (portstatus & USB_PORT_STAT_ENABLE) 258 break; 259 260 /* Switch to long reset delay for the next round */ 261 delay = HUB_LONG_RESET_TIME; 262 } 263 264 if (tries == MAX_TRIES) { 265 debug("Cannot enable port %i after %i retries, " \ 266 "disabling port.\n", port + 1, MAX_TRIES); 267 debug("Maybe the USB cable is bad?\n"); 268 return -1; 269 } 270 271 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET); 272 *portstat = portstatus; 273 return 0; 274 } 275 276 #ifdef CONFIG_DM_USB 277 int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat) 278 { 279 struct usb_device *udev = dev_get_parent_priv(dev); 280 281 return legacy_hub_port_reset(udev, port, portstat); 282 } 283 #endif 284 285 int usb_hub_port_connect_change(struct usb_device *dev, int port) 286 { 287 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 288 unsigned short portstatus; 289 int ret, speed; 290 291 /* Check status */ 292 ret = usb_get_port_status(dev, port + 1, portsts); 293 if (ret < 0) { 294 debug("get_port_status failed\n"); 295 return ret; 296 } 297 298 portstatus = le16_to_cpu(portsts->wPortStatus); 299 debug("portstatus %x, change %x, %s\n", 300 portstatus, 301 le16_to_cpu(portsts->wPortChange), 302 portspeed(portstatus)); 303 304 /* Clear the connection change status */ 305 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION); 306 307 /* Disconnect any existing devices under this port */ 308 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) && 309 (!(portstatus & USB_PORT_STAT_ENABLE))) || 310 usb_device_has_child_on_port(dev, port)) { 311 debug("usb_disconnect(&hub->children[port]);\n"); 312 /* Return now if nothing is connected */ 313 if (!(portstatus & USB_PORT_STAT_CONNECTION)) 314 return -ENOTCONN; 315 } 316 317 /* Reset the port */ 318 ret = legacy_hub_port_reset(dev, port, &portstatus); 319 if (ret < 0) { 320 if (ret != -ENXIO) 321 printf("cannot reset port %i!?\n", port + 1); 322 return ret; 323 } 324 325 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 326 case USB_PORT_STAT_SUPER_SPEED: 327 speed = USB_SPEED_SUPER; 328 break; 329 case USB_PORT_STAT_HIGH_SPEED: 330 speed = USB_SPEED_HIGH; 331 break; 332 case USB_PORT_STAT_LOW_SPEED: 333 speed = USB_SPEED_LOW; 334 break; 335 default: 336 speed = USB_SPEED_FULL; 337 break; 338 } 339 340 #ifdef CONFIG_DM_USB 341 struct udevice *child; 342 343 ret = usb_scan_device(dev->dev, port + 1, speed, &child); 344 #else 345 struct usb_device *usb; 346 347 ret = usb_alloc_new_device(dev->controller, &usb); 348 if (ret) { 349 printf("cannot create new device: ret=%d", ret); 350 return ret; 351 } 352 353 dev->children[port] = usb; 354 usb->speed = speed; 355 usb->parent = dev; 356 usb->portnr = port + 1; 357 /* Run it through the hoops (find a driver, etc) */ 358 ret = usb_new_device(usb); 359 if (ret < 0) { 360 /* Woops, disable the port */ 361 usb_free_device(dev->controller); 362 dev->children[port] = NULL; 363 } 364 #endif 365 if (ret < 0) { 366 debug("hub: disabling port %d\n", port + 1); 367 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE); 368 } 369 370 return ret; 371 } 372 373 static int usb_scan_port(struct usb_device_scan *usb_scan) 374 { 375 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 376 unsigned short portstatus; 377 unsigned short portchange; 378 struct usb_device *dev; 379 struct usb_hub_device *hub; 380 int ret = 0; 381 int i; 382 383 dev = usb_scan->dev; 384 hub = usb_scan->hub; 385 i = usb_scan->port; 386 387 /* 388 * Don't talk to the device before the query delay is expired. 389 * This is needed for voltages to stabalize. 390 */ 391 if (get_timer(0) < hub->query_delay) 392 return 0; 393 394 ret = usb_get_port_status(dev, i + 1, portsts); 395 if (ret < 0) { 396 debug("get_port_status failed\n"); 397 if (get_timer(0) >= hub->connect_timeout) { 398 debug("devnum=%d port=%d: timeout\n", 399 dev->devnum, i + 1); 400 /* Remove this device from scanning list */ 401 list_del(&usb_scan->list); 402 free(usb_scan); 403 return 0; 404 } 405 return 0; 406 } 407 408 portstatus = le16_to_cpu(portsts->wPortStatus); 409 portchange = le16_to_cpu(portsts->wPortChange); 410 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange); 411 412 /* No connection change happened, wait a bit more. */ 413 if (!(portchange & USB_PORT_STAT_C_CONNECTION)) { 414 if (get_timer(0) >= hub->connect_timeout) { 415 debug("devnum=%d port=%d: timeout\n", 416 dev->devnum, i + 1); 417 /* Remove this device from scanning list */ 418 list_del(&usb_scan->list); 419 free(usb_scan); 420 return 0; 421 } 422 return 0; 423 } 424 425 /* Test if the connection came up, and if not exit */ 426 if (!(portstatus & USB_PORT_STAT_CONNECTION)) 427 return 0; 428 429 /* A new USB device is ready at this point */ 430 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1); 431 432 usb_hub_port_connect_change(dev, i); 433 434 if (portchange & USB_PORT_STAT_C_ENABLE) { 435 debug("port %d enable change, status %x\n", i + 1, portstatus); 436 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE); 437 /* 438 * The following hack causes a ghost device problem 439 * to Faraday EHCI 440 */ 441 #ifndef CONFIG_USB_EHCI_FARADAY 442 /* 443 * EM interference sometimes causes bad shielded USB 444 * devices to be shutdown by the hub, this hack enables 445 * them again. Works at least with mouse driver 446 */ 447 if (!(portstatus & USB_PORT_STAT_ENABLE) && 448 (portstatus & USB_PORT_STAT_CONNECTION) && 449 usb_device_has_child_on_port(dev, i)) { 450 debug("already running port %i disabled by hub (EMI?), re-enabling...\n", 451 i + 1); 452 usb_hub_port_connect_change(dev, i); 453 } 454 #endif 455 } 456 457 if (portstatus & USB_PORT_STAT_SUSPEND) { 458 debug("port %d suspend change\n", i + 1); 459 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND); 460 } 461 462 if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 463 debug("port %d over-current change\n", i + 1); 464 usb_clear_port_feature(dev, i + 1, 465 USB_PORT_FEAT_C_OVER_CURRENT); 466 /* Only power-on this one port */ 467 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 468 hub->overcurrent_count[i]++; 469 470 /* 471 * If the max-scan-count is not reached, return without removing 472 * the device from scan-list. This will re-issue a new scan. 473 */ 474 if (hub->overcurrent_count[i] <= 475 PORT_OVERCURRENT_MAX_SCAN_COUNT) 476 return 0; 477 478 /* Otherwise the device will get removed */ 479 printf("Port %d over-current occurred %d times\n", i + 1, 480 hub->overcurrent_count[i]); 481 } 482 483 if (portchange & USB_PORT_STAT_C_RESET) { 484 debug("port %d reset change\n", i + 1); 485 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET); 486 } 487 488 /* 489 * We're done with this device, so let's remove this device from 490 * scanning list 491 */ 492 list_del(&usb_scan->list); 493 free(usb_scan); 494 495 return 0; 496 } 497 498 static int usb_device_list_scan(void) 499 { 500 struct usb_device_scan *usb_scan; 501 struct usb_device_scan *tmp; 502 static int running; 503 int ret = 0; 504 505 /* Only run this loop once for each controller */ 506 if (running) 507 return 0; 508 509 running = 1; 510 511 while (1) { 512 /* We're done, once the list is empty again */ 513 if (list_empty(&usb_scan_list)) 514 goto out; 515 516 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) { 517 int ret; 518 519 /* Scan this port */ 520 ret = usb_scan_port(usb_scan); 521 if (ret) 522 goto out; 523 } 524 } 525 526 out: 527 /* 528 * This USB controller has finished scanning all its connected 529 * USB devices. Set "running" back to 0, so that other USB controllers 530 * will scan their devices too. 531 */ 532 running = 0; 533 534 return ret; 535 } 536 537 static int usb_hub_configure(struct usb_device *dev) 538 { 539 int i, length; 540 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ); 541 unsigned char *bitmap; 542 short hubCharacteristics; 543 struct usb_hub_descriptor *descriptor; 544 struct usb_hub_device *hub; 545 __maybe_unused struct usb_hub_status *hubsts; 546 int ret; 547 548 /* "allocate" Hub device */ 549 hub = usb_hub_allocate(); 550 if (hub == NULL) 551 return -ENOMEM; 552 hub->pusb_dev = dev; 553 /* Get the the hub descriptor */ 554 ret = usb_get_hub_descriptor(dev, buffer, 4); 555 if (ret < 0) { 556 debug("usb_hub_configure: failed to get hub " \ 557 "descriptor, giving up %lX\n", dev->status); 558 return ret; 559 } 560 descriptor = (struct usb_hub_descriptor *)buffer; 561 562 length = min_t(int, descriptor->bLength, 563 sizeof(struct usb_hub_descriptor)); 564 565 ret = usb_get_hub_descriptor(dev, buffer, length); 566 if (ret < 0) { 567 debug("usb_hub_configure: failed to get hub " \ 568 "descriptor 2nd giving up %lX\n", dev->status); 569 return ret; 570 } 571 memcpy((unsigned char *)&hub->desc, buffer, length); 572 /* adjust 16bit values */ 573 put_unaligned(le16_to_cpu(get_unaligned( 574 &descriptor->wHubCharacteristics)), 575 &hub->desc.wHubCharacteristics); 576 /* set the bitmap */ 577 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0]; 578 /* devices not removable by default */ 579 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); 580 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0]; 581 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */ 582 583 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 584 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i]; 585 586 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 587 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i]; 588 589 dev->maxchild = descriptor->bNbrPorts; 590 debug("%d ports detected\n", dev->maxchild); 591 592 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics); 593 switch (hubCharacteristics & HUB_CHAR_LPSM) { 594 case 0x00: 595 debug("ganged power switching\n"); 596 break; 597 case 0x01: 598 debug("individual port power switching\n"); 599 break; 600 case 0x02: 601 case 0x03: 602 debug("unknown reserved power switching mode\n"); 603 break; 604 } 605 606 if (hubCharacteristics & HUB_CHAR_COMPOUND) 607 debug("part of a compound device\n"); 608 else 609 debug("standalone hub\n"); 610 611 switch (hubCharacteristics & HUB_CHAR_OCPM) { 612 case 0x00: 613 debug("global over-current protection\n"); 614 break; 615 case 0x08: 616 debug("individual port over-current protection\n"); 617 break; 618 case 0x10: 619 case 0x18: 620 debug("no over-current protection\n"); 621 break; 622 } 623 624 debug("power on to power good time: %dms\n", 625 descriptor->bPwrOn2PwrGood * 2); 626 debug("hub controller current requirement: %dmA\n", 627 descriptor->bHubContrCurrent); 628 629 for (i = 0; i < dev->maxchild; i++) 630 debug("port %d is%s removable\n", i + 1, 631 hub->desc.DeviceRemovable[(i + 1) / 8] & \ 632 (1 << ((i + 1) % 8)) ? " not" : ""); 633 634 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) { 635 debug("usb_hub_configure: failed to get Status - " \ 636 "too long: %d\n", descriptor->bLength); 637 return -EFBIG; 638 } 639 640 ret = usb_get_hub_status(dev, buffer); 641 if (ret < 0) { 642 debug("usb_hub_configure: failed to get Status %lX\n", 643 dev->status); 644 return ret; 645 } 646 647 #ifdef DEBUG 648 hubsts = (struct usb_hub_status *)buffer; 649 #endif 650 651 debug("get_hub_status returned status %X, change %X\n", 652 le16_to_cpu(hubsts->wHubStatus), 653 le16_to_cpu(hubsts->wHubChange)); 654 debug("local power source is %s\n", 655 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \ 656 "lost (inactive)" : "good"); 657 debug("%sover-current condition exists\n", 658 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \ 659 "" : "no "); 660 usb_hub_power_on(hub); 661 662 /* 663 * Reset any devices that may be in a bad state when applying 664 * the power. This is a __weak function. Resetting of the devices 665 * should occur in the board file of the device. 666 */ 667 for (i = 0; i < dev->maxchild; i++) 668 usb_hub_reset_devices(i + 1); 669 670 /* 671 * Only add the connected USB devices, including potential hubs, 672 * to a scanning list. This list will get scanned and devices that 673 * are detected (either via port connected or via port timeout) 674 * will get removed from this list. Scanning of the devices on this 675 * list will continue until all devices are removed. 676 */ 677 for (i = 0; i < dev->maxchild; i++) { 678 struct usb_device_scan *usb_scan; 679 680 usb_scan = calloc(1, sizeof(*usb_scan)); 681 if (!usb_scan) { 682 printf("Can't allocate memory for USB device!\n"); 683 return -ENOMEM; 684 } 685 usb_scan->dev = dev; 686 usb_scan->hub = hub; 687 usb_scan->port = i; 688 list_add_tail(&usb_scan->list, &usb_scan_list); 689 } 690 691 /* 692 * And now call the scanning code which loops over the generated list 693 */ 694 ret = usb_device_list_scan(); 695 696 return ret; 697 } 698 699 static int usb_hub_check(struct usb_device *dev, int ifnum) 700 { 701 struct usb_interface *iface; 702 struct usb_endpoint_descriptor *ep = NULL; 703 704 iface = &dev->config.if_desc[ifnum]; 705 /* Is it a hub? */ 706 if (iface->desc.bInterfaceClass != USB_CLASS_HUB) 707 goto err; 708 /* Some hubs have a subclass of 1, which AFAICT according to the */ 709 /* specs is not defined, but it works */ 710 if ((iface->desc.bInterfaceSubClass != 0) && 711 (iface->desc.bInterfaceSubClass != 1)) 712 goto err; 713 /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 714 if (iface->desc.bNumEndpoints != 1) 715 goto err; 716 ep = &iface->ep_desc[0]; 717 /* Output endpoint? Curiousier and curiousier.. */ 718 if (!(ep->bEndpointAddress & USB_DIR_IN)) 719 goto err; 720 /* If it's not an interrupt endpoint, we'd better punt! */ 721 if ((ep->bmAttributes & 3) != 3) 722 goto err; 723 /* We found a hub */ 724 debug("USB hub found\n"); 725 return 0; 726 727 err: 728 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n", 729 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass, 730 iface->desc.bNumEndpoints); 731 if (ep) { 732 debug(" bEndpointAddress=%#x, bmAttributes=%d", 733 ep->bEndpointAddress, ep->bmAttributes); 734 } 735 736 return -ENOENT; 737 } 738 739 int usb_hub_probe(struct usb_device *dev, int ifnum) 740 { 741 int ret; 742 743 ret = usb_hub_check(dev, ifnum); 744 if (ret) 745 return 0; 746 ret = usb_hub_configure(dev); 747 return ret; 748 } 749 750 #ifdef CONFIG_DM_USB 751 int usb_hub_scan(struct udevice *hub) 752 { 753 struct usb_device *udev = dev_get_parent_priv(hub); 754 755 return usb_hub_configure(udev); 756 } 757 758 static int usb_hub_post_bind(struct udevice *dev) 759 { 760 /* Scan the bus for devices */ 761 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false); 762 } 763 764 static int usb_hub_post_probe(struct udevice *dev) 765 { 766 debug("%s\n", __func__); 767 return usb_hub_scan(dev); 768 } 769 770 static const struct udevice_id usb_hub_ids[] = { 771 { .compatible = "usb-hub" }, 772 { } 773 }; 774 775 U_BOOT_DRIVER(usb_generic_hub) = { 776 .name = "usb_hub", 777 .id = UCLASS_USB_HUB, 778 .of_match = usb_hub_ids, 779 .flags = DM_FLAG_ALLOC_PRIV_DMA, 780 }; 781 782 UCLASS_DRIVER(usb_hub) = { 783 .id = UCLASS_USB_HUB, 784 .name = "usb_hub", 785 .post_bind = usb_hub_post_bind, 786 .post_probe = usb_hub_post_probe, 787 .child_pre_probe = usb_child_pre_probe, 788 .per_child_auto_alloc_size = sizeof(struct usb_device), 789 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata), 790 }; 791 792 static const struct usb_device_id hub_id_table[] = { 793 { 794 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 795 .bDeviceClass = USB_CLASS_HUB 796 }, 797 { } /* Terminating entry */ 798 }; 799 800 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table); 801 802 #endif 803