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 40 DECLARE_GLOBAL_DATA_PTR; 41 42 #include <usb.h> 43 44 #define USB_BUFSIZ 512 45 46 #define HUB_SHORT_RESET_TIME 20 47 #define HUB_LONG_RESET_TIME 200 48 49 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3 50 51 struct usb_device_scan { 52 struct usb_device *dev; /* USB hub device to scan */ 53 struct usb_hub_device *hub; /* USB hub struct */ 54 int port; /* USB port to scan */ 55 struct list_head list; 56 }; 57 58 static LIST_HEAD(usb_scan_list); 59 60 __weak void usb_hub_reset_devices(int port) 61 { 62 return; 63 } 64 65 static inline bool usb_hub_is_superspeed(struct usb_device *hdev) 66 { 67 return hdev->descriptor.bDeviceProtocol == 3; 68 } 69 70 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size) 71 { 72 unsigned short dtype = USB_DT_HUB; 73 74 if (usb_hub_is_superspeed(dev)) 75 dtype = USB_DT_SS_HUB; 76 77 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 78 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 79 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT); 80 } 81 82 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature) 83 { 84 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 85 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, 86 port, NULL, 0, USB_CNTL_TIMEOUT); 87 } 88 89 static int usb_set_port_feature(struct usb_device *dev, int port, int feature) 90 { 91 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 92 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, 93 port, NULL, 0, USB_CNTL_TIMEOUT); 94 } 95 96 static int usb_get_hub_status(struct usb_device *dev, void *data) 97 { 98 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 99 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 100 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT); 101 } 102 103 int usb_get_port_status(struct usb_device *dev, int port, void *data) 104 { 105 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 106 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port, 107 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT); 108 } 109 110 111 static void usb_hub_power_on(struct usb_hub_device *hub) 112 { 113 int i; 114 struct usb_device *dev; 115 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2; 116 const char *env; 117 118 dev = hub->pusb_dev; 119 120 debug("enabling power on all ports\n"); 121 for (i = 0; i < dev->maxchild; i++) { 122 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 123 debug("port %d returns %lX\n", i + 1, dev->status); 124 } 125 126 #ifdef CONFIG_SANDBOX 127 /* 128 * Don't set timeout / delay values here. This results 129 * in these values still being reset to 0. 130 */ 131 if (state_get_skip_delays()) 132 return; 133 #endif 134 135 /* 136 * Wait for power to become stable, 137 * plus spec-defined max time for device to connect 138 * but allow this time to be increased via env variable as some 139 * devices break the spec and require longer warm-up times 140 */ 141 env = getenv("usb_pgood_delay"); 142 if (env) 143 pgood_delay = max(pgood_delay, 144 (unsigned)simple_strtol(env, NULL, 0)); 145 debug("pgood_delay=%dms\n", pgood_delay); 146 147 /* 148 * Do a minimum delay of the larger value of 100ms or pgood_delay 149 * so that the power can stablize before the devices are queried 150 */ 151 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay); 152 153 /* 154 * Record the power-on timeout here. The max. delay (timeout) 155 * will be done based on this value in the USB port loop in 156 * usb_hub_configure() later. 157 */ 158 hub->connect_timeout = hub->query_delay + 1000; 159 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n", 160 dev->devnum, max(100, (int)pgood_delay), 161 max(100, (int)pgood_delay) + 1000); 162 } 163 164 #ifndef CONFIG_DM_USB 165 static struct usb_hub_device hub_dev[USB_MAX_HUB]; 166 static int usb_hub_index; 167 168 void usb_hub_reset(void) 169 { 170 usb_hub_index = 0; 171 172 /* Zero out global hub_dev in case its re-used again */ 173 memset(hub_dev, 0, sizeof(hub_dev)); 174 } 175 176 static struct usb_hub_device *usb_hub_allocate(void) 177 { 178 if (usb_hub_index < USB_MAX_HUB) 179 return &hub_dev[usb_hub_index++]; 180 181 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB); 182 return NULL; 183 } 184 #endif 185 186 #define MAX_TRIES 5 187 188 static inline char *portspeed(int portstatus) 189 { 190 char *speed_str; 191 192 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 193 case USB_PORT_STAT_SUPER_SPEED: 194 speed_str = "5 Gb/s"; 195 break; 196 case USB_PORT_STAT_HIGH_SPEED: 197 speed_str = "480 Mb/s"; 198 break; 199 case USB_PORT_STAT_LOW_SPEED: 200 speed_str = "1.5 Mb/s"; 201 break; 202 default: 203 speed_str = "12 Mb/s"; 204 break; 205 } 206 207 return speed_str; 208 } 209 210 int legacy_hub_port_reset(struct usb_device *dev, int port, 211 unsigned short *portstat) 212 { 213 int err, tries; 214 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 215 unsigned short portstatus, portchange; 216 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */ 217 218 #ifdef CONFIG_DM_USB 219 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name, 220 port + 1); 221 #else 222 debug("%s: resetting port %d...\n", __func__, port + 1); 223 #endif 224 for (tries = 0; tries < MAX_TRIES; tries++) { 225 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET); 226 if (err < 0) 227 return err; 228 229 mdelay(delay); 230 231 if (usb_get_port_status(dev, port + 1, portsts) < 0) { 232 debug("get_port_status failed status %lX\n", 233 dev->status); 234 return -1; 235 } 236 portstatus = le16_to_cpu(portsts->wPortStatus); 237 portchange = le16_to_cpu(portsts->wPortChange); 238 239 debug("portstatus %x, change %x, %s\n", portstatus, portchange, 240 portspeed(portstatus)); 241 242 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \ 243 " USB_PORT_STAT_ENABLE %d\n", 244 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0, 245 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0, 246 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0); 247 248 /* 249 * Perhaps we should check for the following here: 250 * - C_CONNECTION hasn't been set. 251 * - CONNECTION is still set. 252 * 253 * Doing so would ensure that the device is still connected 254 * to the bus, and hasn't been unplugged or replaced while the 255 * USB bus reset was going on. 256 * 257 * However, if we do that, then (at least) a San Disk Ultra 258 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA 259 * Tegra Jetson TK1 board. For some reason, the device appears 260 * to briefly drop off the bus when this second bus reset is 261 * executed, yet if we retry this loop, it'll eventually come 262 * back after another reset or two. 263 */ 264 265 if (portstatus & USB_PORT_STAT_ENABLE) 266 break; 267 268 /* Switch to long reset delay for the next round */ 269 delay = HUB_LONG_RESET_TIME; 270 } 271 272 if (tries == MAX_TRIES) { 273 debug("Cannot enable port %i after %i retries, " \ 274 "disabling port.\n", port + 1, MAX_TRIES); 275 debug("Maybe the USB cable is bad?\n"); 276 return -1; 277 } 278 279 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET); 280 *portstat = portstatus; 281 return 0; 282 } 283 284 #ifdef CONFIG_DM_USB 285 int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat) 286 { 287 struct usb_device *udev = dev_get_parent_priv(dev); 288 289 return legacy_hub_port_reset(udev, port, portstat); 290 } 291 #endif 292 293 int usb_hub_port_connect_change(struct usb_device *dev, int port) 294 { 295 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 296 unsigned short portstatus; 297 int ret, speed; 298 299 /* Check status */ 300 ret = usb_get_port_status(dev, port + 1, portsts); 301 if (ret < 0) { 302 debug("get_port_status failed\n"); 303 return ret; 304 } 305 306 portstatus = le16_to_cpu(portsts->wPortStatus); 307 debug("portstatus %x, change %x, %s\n", 308 portstatus, 309 le16_to_cpu(portsts->wPortChange), 310 portspeed(portstatus)); 311 312 /* Clear the connection change status */ 313 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION); 314 315 /* Disconnect any existing devices under this port */ 316 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) && 317 (!(portstatus & USB_PORT_STAT_ENABLE))) || 318 usb_device_has_child_on_port(dev, port)) { 319 debug("usb_disconnect(&hub->children[port]);\n"); 320 /* Return now if nothing is connected */ 321 if (!(portstatus & USB_PORT_STAT_CONNECTION)) 322 return -ENOTCONN; 323 } 324 325 /* Reset the port */ 326 ret = legacy_hub_port_reset(dev, port, &portstatus); 327 if (ret < 0) { 328 if (ret != -ENXIO) 329 printf("cannot reset port %i!?\n", port + 1); 330 return ret; 331 } 332 333 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 334 case USB_PORT_STAT_SUPER_SPEED: 335 speed = USB_SPEED_SUPER; 336 break; 337 case USB_PORT_STAT_HIGH_SPEED: 338 speed = USB_SPEED_HIGH; 339 break; 340 case USB_PORT_STAT_LOW_SPEED: 341 speed = USB_SPEED_LOW; 342 break; 343 default: 344 speed = USB_SPEED_FULL; 345 break; 346 } 347 348 #ifdef CONFIG_DM_USB 349 struct udevice *child; 350 351 ret = usb_scan_device(dev->dev, port + 1, speed, &child); 352 #else 353 struct usb_device *usb; 354 355 ret = usb_alloc_new_device(dev->controller, &usb); 356 if (ret) { 357 printf("cannot create new device: ret=%d", ret); 358 return ret; 359 } 360 361 dev->children[port] = usb; 362 usb->speed = speed; 363 usb->parent = dev; 364 usb->portnr = port + 1; 365 /* Run it through the hoops (find a driver, etc) */ 366 ret = usb_new_device(usb); 367 if (ret < 0) { 368 /* Woops, disable the port */ 369 usb_free_device(dev->controller); 370 dev->children[port] = NULL; 371 } 372 #endif 373 if (ret < 0) { 374 debug("hub: disabling port %d\n", port + 1); 375 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE); 376 } 377 378 return ret; 379 } 380 381 static int usb_scan_port(struct usb_device_scan *usb_scan) 382 { 383 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 384 unsigned short portstatus; 385 unsigned short portchange; 386 struct usb_device *dev; 387 struct usb_hub_device *hub; 388 int ret = 0; 389 int i; 390 391 dev = usb_scan->dev; 392 hub = usb_scan->hub; 393 i = usb_scan->port; 394 395 /* 396 * Don't talk to the device before the query delay is expired. 397 * This is needed for voltages to stabalize. 398 */ 399 if (get_timer(0) < hub->query_delay) 400 return 0; 401 402 ret = usb_get_port_status(dev, i + 1, portsts); 403 if (ret < 0) { 404 debug("get_port_status failed\n"); 405 if (get_timer(0) >= hub->connect_timeout) { 406 debug("devnum=%d port=%d: timeout\n", 407 dev->devnum, i + 1); 408 /* Remove this device from scanning list */ 409 list_del(&usb_scan->list); 410 free(usb_scan); 411 return 0; 412 } 413 return 0; 414 } 415 416 portstatus = le16_to_cpu(portsts->wPortStatus); 417 portchange = le16_to_cpu(portsts->wPortChange); 418 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange); 419 420 /* 421 * No connection change happened, wait a bit more. 422 * 423 * For some situation, the hub reports no connection change but a 424 * device is connected to the port (eg: CCS bit is set but CSC is not 425 * in the PORTSC register of a root hub), ignore such case. 426 */ 427 if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 428 !(portstatus & USB_PORT_STAT_CONNECTION)) { 429 if (get_timer(0) >= hub->connect_timeout) { 430 debug("devnum=%d port=%d: timeout\n", 431 dev->devnum, i + 1); 432 /* Remove this device from scanning list */ 433 list_del(&usb_scan->list); 434 free(usb_scan); 435 return 0; 436 } 437 return 0; 438 } 439 440 /* A new USB device is ready at this point */ 441 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1); 442 443 usb_hub_port_connect_change(dev, i); 444 445 if (portchange & USB_PORT_STAT_C_ENABLE) { 446 debug("port %d enable change, status %x\n", i + 1, portstatus); 447 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE); 448 /* 449 * The following hack causes a ghost device problem 450 * to Faraday EHCI 451 */ 452 #ifndef CONFIG_USB_EHCI_FARADAY 453 /* 454 * EM interference sometimes causes bad shielded USB 455 * devices to be shutdown by the hub, this hack enables 456 * them again. Works at least with mouse driver 457 */ 458 if (!(portstatus & USB_PORT_STAT_ENABLE) && 459 (portstatus & USB_PORT_STAT_CONNECTION) && 460 usb_device_has_child_on_port(dev, i)) { 461 debug("already running port %i disabled by hub (EMI?), re-enabling...\n", 462 i + 1); 463 usb_hub_port_connect_change(dev, i); 464 } 465 #endif 466 } 467 468 if (portstatus & USB_PORT_STAT_SUSPEND) { 469 debug("port %d suspend change\n", i + 1); 470 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND); 471 } 472 473 if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 474 debug("port %d over-current change\n", i + 1); 475 usb_clear_port_feature(dev, i + 1, 476 USB_PORT_FEAT_C_OVER_CURRENT); 477 /* Only power-on this one port */ 478 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 479 hub->overcurrent_count[i]++; 480 481 /* 482 * If the max-scan-count is not reached, return without removing 483 * the device from scan-list. This will re-issue a new scan. 484 */ 485 if (hub->overcurrent_count[i] <= 486 PORT_OVERCURRENT_MAX_SCAN_COUNT) 487 return 0; 488 489 /* Otherwise the device will get removed */ 490 printf("Port %d over-current occurred %d times\n", i + 1, 491 hub->overcurrent_count[i]); 492 } 493 494 if (portchange & USB_PORT_STAT_C_RESET) { 495 debug("port %d reset change\n", i + 1); 496 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET); 497 } 498 499 /* 500 * We're done with this device, so let's remove this device from 501 * scanning list 502 */ 503 list_del(&usb_scan->list); 504 free(usb_scan); 505 506 return 0; 507 } 508 509 static int usb_device_list_scan(void) 510 { 511 struct usb_device_scan *usb_scan; 512 struct usb_device_scan *tmp; 513 static int running; 514 int ret = 0; 515 516 /* Only run this loop once for each controller */ 517 if (running) 518 return 0; 519 520 running = 1; 521 522 while (1) { 523 /* We're done, once the list is empty again */ 524 if (list_empty(&usb_scan_list)) 525 goto out; 526 527 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) { 528 int ret; 529 530 /* Scan this port */ 531 ret = usb_scan_port(usb_scan); 532 if (ret) 533 goto out; 534 } 535 } 536 537 out: 538 /* 539 * This USB controller has finished scanning all its connected 540 * USB devices. Set "running" back to 0, so that other USB controllers 541 * will scan their devices too. 542 */ 543 running = 0; 544 545 return ret; 546 } 547 548 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev) 549 { 550 struct usb_hub_device *hub; 551 552 #ifndef CONFIG_DM_USB 553 /* "allocate" Hub device */ 554 hub = usb_hub_allocate(); 555 #else 556 hub = dev_get_uclass_priv(dev->dev); 557 #endif 558 559 return hub; 560 } 561 562 static int usb_hub_configure(struct usb_device *dev) 563 { 564 int i, length; 565 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ); 566 unsigned char *bitmap; 567 short hubCharacteristics; 568 struct usb_hub_descriptor *descriptor; 569 struct usb_hub_device *hub; 570 __maybe_unused struct usb_hub_status *hubsts; 571 int ret; 572 573 hub = usb_get_hub_device(dev); 574 if (hub == NULL) 575 return -ENOMEM; 576 hub->pusb_dev = dev; 577 578 /* Get the the hub descriptor */ 579 ret = usb_get_hub_descriptor(dev, buffer, 4); 580 if (ret < 0) { 581 debug("usb_hub_configure: failed to get hub " \ 582 "descriptor, giving up %lX\n", dev->status); 583 return ret; 584 } 585 descriptor = (struct usb_hub_descriptor *)buffer; 586 587 length = min_t(int, descriptor->bLength, 588 sizeof(struct usb_hub_descriptor)); 589 590 ret = usb_get_hub_descriptor(dev, buffer, length); 591 if (ret < 0) { 592 debug("usb_hub_configure: failed to get hub " \ 593 "descriptor 2nd giving up %lX\n", dev->status); 594 return ret; 595 } 596 memcpy((unsigned char *)&hub->desc, buffer, length); 597 /* adjust 16bit values */ 598 put_unaligned(le16_to_cpu(get_unaligned( 599 &descriptor->wHubCharacteristics)), 600 &hub->desc.wHubCharacteristics); 601 /* set the bitmap */ 602 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0]; 603 /* devices not removable by default */ 604 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); 605 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0]; 606 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */ 607 608 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 609 hub->desc.u.hs.DeviceRemovable[i] = 610 descriptor->u.hs.DeviceRemovable[i]; 611 612 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 613 hub->desc.u.hs.PortPowerCtrlMask[i] = 614 descriptor->u.hs.PortPowerCtrlMask[i]; 615 616 dev->maxchild = descriptor->bNbrPorts; 617 debug("%d ports detected\n", dev->maxchild); 618 619 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics); 620 switch (hubCharacteristics & HUB_CHAR_LPSM) { 621 case 0x00: 622 debug("ganged power switching\n"); 623 break; 624 case 0x01: 625 debug("individual port power switching\n"); 626 break; 627 case 0x02: 628 case 0x03: 629 debug("unknown reserved power switching mode\n"); 630 break; 631 } 632 633 if (hubCharacteristics & HUB_CHAR_COMPOUND) 634 debug("part of a compound device\n"); 635 else 636 debug("standalone hub\n"); 637 638 switch (hubCharacteristics & HUB_CHAR_OCPM) { 639 case 0x00: 640 debug("global over-current protection\n"); 641 break; 642 case 0x08: 643 debug("individual port over-current protection\n"); 644 break; 645 case 0x10: 646 case 0x18: 647 debug("no over-current protection\n"); 648 break; 649 } 650 651 debug("power on to power good time: %dms\n", 652 descriptor->bPwrOn2PwrGood * 2); 653 debug("hub controller current requirement: %dmA\n", 654 descriptor->bHubContrCurrent); 655 656 for (i = 0; i < dev->maxchild; i++) 657 debug("port %d is%s removable\n", i + 1, 658 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \ 659 (1 << ((i + 1) % 8)) ? " not" : ""); 660 661 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) { 662 debug("usb_hub_configure: failed to get Status - " \ 663 "too long: %d\n", descriptor->bLength); 664 return -EFBIG; 665 } 666 667 ret = usb_get_hub_status(dev, buffer); 668 if (ret < 0) { 669 debug("usb_hub_configure: failed to get Status %lX\n", 670 dev->status); 671 return ret; 672 } 673 674 #ifdef DEBUG 675 hubsts = (struct usb_hub_status *)buffer; 676 #endif 677 678 debug("get_hub_status returned status %X, change %X\n", 679 le16_to_cpu(hubsts->wHubStatus), 680 le16_to_cpu(hubsts->wHubChange)); 681 debug("local power source is %s\n", 682 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \ 683 "lost (inactive)" : "good"); 684 debug("%sover-current condition exists\n", 685 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \ 686 "" : "no "); 687 usb_hub_power_on(hub); 688 689 /* 690 * Reset any devices that may be in a bad state when applying 691 * the power. This is a __weak function. Resetting of the devices 692 * should occur in the board file of the device. 693 */ 694 for (i = 0; i < dev->maxchild; i++) 695 usb_hub_reset_devices(i + 1); 696 697 /* 698 * Only add the connected USB devices, including potential hubs, 699 * to a scanning list. This list will get scanned and devices that 700 * are detected (either via port connected or via port timeout) 701 * will get removed from this list. Scanning of the devices on this 702 * list will continue until all devices are removed. 703 */ 704 for (i = 0; i < dev->maxchild; i++) { 705 struct usb_device_scan *usb_scan; 706 707 usb_scan = calloc(1, sizeof(*usb_scan)); 708 if (!usb_scan) { 709 printf("Can't allocate memory for USB device!\n"); 710 return -ENOMEM; 711 } 712 usb_scan->dev = dev; 713 usb_scan->hub = hub; 714 usb_scan->port = i; 715 list_add_tail(&usb_scan->list, &usb_scan_list); 716 } 717 718 /* 719 * And now call the scanning code which loops over the generated list 720 */ 721 ret = usb_device_list_scan(); 722 723 return ret; 724 } 725 726 static int usb_hub_check(struct usb_device *dev, int ifnum) 727 { 728 struct usb_interface *iface; 729 struct usb_endpoint_descriptor *ep = NULL; 730 731 iface = &dev->config.if_desc[ifnum]; 732 /* Is it a hub? */ 733 if (iface->desc.bInterfaceClass != USB_CLASS_HUB) 734 goto err; 735 /* Some hubs have a subclass of 1, which AFAICT according to the */ 736 /* specs is not defined, but it works */ 737 if ((iface->desc.bInterfaceSubClass != 0) && 738 (iface->desc.bInterfaceSubClass != 1)) 739 goto err; 740 /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 741 if (iface->desc.bNumEndpoints != 1) 742 goto err; 743 ep = &iface->ep_desc[0]; 744 /* Output endpoint? Curiousier and curiousier.. */ 745 if (!(ep->bEndpointAddress & USB_DIR_IN)) 746 goto err; 747 /* If it's not an interrupt endpoint, we'd better punt! */ 748 if ((ep->bmAttributes & 3) != 3) 749 goto err; 750 /* We found a hub */ 751 debug("USB hub found\n"); 752 return 0; 753 754 err: 755 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n", 756 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass, 757 iface->desc.bNumEndpoints); 758 if (ep) { 759 debug(" bEndpointAddress=%#x, bmAttributes=%d", 760 ep->bEndpointAddress, ep->bmAttributes); 761 } 762 763 return -ENOENT; 764 } 765 766 int usb_hub_probe(struct usb_device *dev, int ifnum) 767 { 768 int ret; 769 770 ret = usb_hub_check(dev, ifnum); 771 if (ret) 772 return 0; 773 ret = usb_hub_configure(dev); 774 return ret; 775 } 776 777 #ifdef CONFIG_DM_USB 778 int usb_hub_scan(struct udevice *hub) 779 { 780 struct usb_device *udev = dev_get_parent_priv(hub); 781 782 return usb_hub_configure(udev); 783 } 784 785 static int usb_hub_post_probe(struct udevice *dev) 786 { 787 debug("%s\n", __func__); 788 return usb_hub_scan(dev); 789 } 790 791 static const struct udevice_id usb_hub_ids[] = { 792 { .compatible = "usb-hub" }, 793 { } 794 }; 795 796 U_BOOT_DRIVER(usb_generic_hub) = { 797 .name = "usb_hub", 798 .id = UCLASS_USB_HUB, 799 .of_match = usb_hub_ids, 800 .flags = DM_FLAG_ALLOC_PRIV_DMA, 801 }; 802 803 UCLASS_DRIVER(usb_hub) = { 804 .id = UCLASS_USB_HUB, 805 .name = "usb_hub", 806 .post_bind = dm_scan_fdt_dev, 807 .post_probe = usb_hub_post_probe, 808 .child_pre_probe = usb_child_pre_probe, 809 .per_child_auto_alloc_size = sizeof(struct usb_device), 810 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata), 811 .per_device_auto_alloc_size = sizeof(struct usb_hub_device), 812 }; 813 814 static const struct usb_device_id hub_id_table[] = { 815 { 816 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 817 .bDeviceClass = USB_CLASS_HUB 818 }, 819 { } /* Terminating entry */ 820 }; 821 822 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table); 823 824 #endif 825