1 /* 2 * Most of this source has been derived from the Linux USB 3 * project: 4 * (C) Copyright Linus Torvalds 1999 5 * (C) Copyright Johannes Erdfelt 1999-2001 6 * (C) Copyright Andreas Gal 1999 7 * (C) Copyright Gregory P. Smith 1999 8 * (C) Copyright Deti Fliegl 1999 (new USB architecture) 9 * (C) Copyright Randy Dunlap 2000 10 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id) 11 * (C) Copyright Yggdrasil Computing, Inc. 2000 12 * (usb_device_id matching changes by Adam J. Richter) 13 * 14 * Adapted for U-Boot: 15 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland 16 * 17 * SPDX-License-Identifier: GPL-2.0+ 18 */ 19 20 /**************************************************************************** 21 * HUB "Driver" 22 * Probes device for being a hub and configurate it 23 */ 24 25 #include <common.h> 26 #include <command.h> 27 #include <asm/processor.h> 28 #include <asm/unaligned.h> 29 #include <linux/ctype.h> 30 #include <asm/byteorder.h> 31 #include <asm/unaligned.h> 32 33 #include <usb.h> 34 #ifdef CONFIG_4xx 35 #include <asm/4xx_pci.h> 36 #endif 37 38 #ifndef CONFIG_USB_HUB_MIN_POWER_ON_DELAY 39 #define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 100 40 #endif 41 42 #define USB_BUFSIZ 512 43 44 static struct usb_hub_device hub_dev[USB_MAX_HUB]; 45 static int usb_hub_index; 46 47 __weak void usb_hub_reset_devices(int port) 48 { 49 return; 50 } 51 52 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size) 53 { 54 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 55 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 56 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT); 57 } 58 59 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature) 60 { 61 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 62 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, 63 port, NULL, 0, USB_CNTL_TIMEOUT); 64 } 65 66 static int usb_set_port_feature(struct usb_device *dev, int port, int feature) 67 { 68 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 69 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, 70 port, NULL, 0, USB_CNTL_TIMEOUT); 71 } 72 73 static int usb_get_hub_status(struct usb_device *dev, void *data) 74 { 75 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 76 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 77 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT); 78 } 79 80 static int usb_get_port_status(struct usb_device *dev, int port, void *data) 81 { 82 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 83 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port, 84 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT); 85 } 86 87 88 static void usb_hub_power_on(struct usb_hub_device *hub) 89 { 90 int i; 91 struct usb_device *dev; 92 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2; 93 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 94 unsigned short portstatus; 95 int ret; 96 97 dev = hub->pusb_dev; 98 99 /* 100 * Enable power to the ports: 101 * Here we Power-cycle the ports: aka, 102 * turning them off and turning on again. 103 */ 104 debug("enabling power on all ports\n"); 105 for (i = 0; i < dev->maxchild; i++) { 106 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 107 debug("port %d returns %lX\n", i + 1, dev->status); 108 } 109 110 /* Wait at least 2*bPwrOn2PwrGood for PP to change */ 111 mdelay(pgood_delay); 112 113 for (i = 0; i < dev->maxchild; i++) { 114 ret = usb_get_port_status(dev, i + 1, portsts); 115 if (ret < 0) { 116 debug("port %d: get_port_status failed\n", i + 1); 117 continue; 118 } 119 120 /* 121 * Check to confirm the state of Port Power: 122 * xHCI says "After modifying PP, s/w shall read 123 * PP and confirm that it has reached the desired state 124 * before modifying it again, undefined behavior may occur 125 * if this procedure is not followed". 126 * EHCI doesn't say anything like this, but no harm in keeping 127 * this. 128 */ 129 portstatus = le16_to_cpu(portsts->wPortStatus); 130 if (portstatus & (USB_PORT_STAT_POWER << 1)) { 131 debug("port %d: Port power change failed\n", i + 1); 132 continue; 133 } 134 } 135 136 for (i = 0; i < dev->maxchild; i++) { 137 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); 138 debug("port %d returns %lX\n", i + 1, dev->status); 139 } 140 141 /* Wait for power to become stable */ 142 mdelay(max(pgood_delay, CONFIG_USB_HUB_MIN_POWER_ON_DELAY)); 143 } 144 145 void usb_hub_reset(void) 146 { 147 usb_hub_index = 0; 148 } 149 150 static struct usb_hub_device *usb_hub_allocate(void) 151 { 152 if (usb_hub_index < USB_MAX_HUB) 153 return &hub_dev[usb_hub_index++]; 154 155 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB); 156 return NULL; 157 } 158 159 #define MAX_TRIES 5 160 161 static inline char *portspeed(int portstatus) 162 { 163 char *speed_str; 164 165 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 166 case USB_PORT_STAT_SUPER_SPEED: 167 speed_str = "5 Gb/s"; 168 break; 169 case USB_PORT_STAT_HIGH_SPEED: 170 speed_str = "480 Mb/s"; 171 break; 172 case USB_PORT_STAT_LOW_SPEED: 173 speed_str = "1.5 Mb/s"; 174 break; 175 default: 176 speed_str = "12 Mb/s"; 177 break; 178 } 179 180 return speed_str; 181 } 182 183 int hub_port_reset(struct usb_device *dev, int port, 184 unsigned short *portstat) 185 { 186 int tries; 187 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 188 unsigned short portstatus, portchange; 189 190 debug("hub_port_reset: resetting port %d...\n", port); 191 for (tries = 0; tries < MAX_TRIES; tries++) { 192 193 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET); 194 mdelay(200); 195 196 if (usb_get_port_status(dev, port + 1, portsts) < 0) { 197 debug("get_port_status failed status %lX\n", 198 dev->status); 199 return -1; 200 } 201 portstatus = le16_to_cpu(portsts->wPortStatus); 202 portchange = le16_to_cpu(portsts->wPortChange); 203 204 debug("portstatus %x, change %x, %s\n", portstatus, portchange, 205 portspeed(portstatus)); 206 207 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \ 208 " USB_PORT_STAT_ENABLE %d\n", 209 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0, 210 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0, 211 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0); 212 213 if ((portchange & USB_PORT_STAT_C_CONNECTION) || 214 !(portstatus & USB_PORT_STAT_CONNECTION)) 215 return -1; 216 217 if (portstatus & USB_PORT_STAT_ENABLE) 218 break; 219 220 mdelay(200); 221 } 222 223 if (tries == MAX_TRIES) { 224 debug("Cannot enable port %i after %i retries, " \ 225 "disabling port.\n", port + 1, MAX_TRIES); 226 debug("Maybe the USB cable is bad?\n"); 227 return -1; 228 } 229 230 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET); 231 *portstat = portstatus; 232 return 0; 233 } 234 235 236 void usb_hub_port_connect_change(struct usb_device *dev, int port) 237 { 238 struct usb_device *usb; 239 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 240 unsigned short portstatus; 241 242 /* Check status */ 243 if (usb_get_port_status(dev, port + 1, portsts) < 0) { 244 debug("get_port_status failed\n"); 245 return; 246 } 247 248 portstatus = le16_to_cpu(portsts->wPortStatus); 249 debug("portstatus %x, change %x, %s\n", 250 portstatus, 251 le16_to_cpu(portsts->wPortChange), 252 portspeed(portstatus)); 253 254 /* Clear the connection change status */ 255 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION); 256 257 /* Disconnect any existing devices under this port */ 258 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) && 259 (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) { 260 debug("usb_disconnect(&hub->children[port]);\n"); 261 /* Return now if nothing is connected */ 262 if (!(portstatus & USB_PORT_STAT_CONNECTION)) 263 return; 264 } 265 mdelay(200); 266 267 /* Reset the port */ 268 if (hub_port_reset(dev, port, &portstatus) < 0) { 269 printf("cannot reset port %i!?\n", port + 1); 270 return; 271 } 272 273 mdelay(200); 274 275 /* Allocate a new device struct for it */ 276 usb = usb_alloc_new_device(dev->controller); 277 278 switch (portstatus & USB_PORT_STAT_SPEED_MASK) { 279 case USB_PORT_STAT_SUPER_SPEED: 280 usb->speed = USB_SPEED_SUPER; 281 break; 282 case USB_PORT_STAT_HIGH_SPEED: 283 usb->speed = USB_SPEED_HIGH; 284 break; 285 case USB_PORT_STAT_LOW_SPEED: 286 usb->speed = USB_SPEED_LOW; 287 break; 288 default: 289 usb->speed = USB_SPEED_FULL; 290 break; 291 } 292 293 dev->children[port] = usb; 294 usb->parent = dev; 295 usb->portnr = port + 1; 296 /* Run it through the hoops (find a driver, etc) */ 297 if (usb_new_device(usb)) { 298 /* Woops, disable the port */ 299 usb_free_device(); 300 dev->children[port] = NULL; 301 debug("hub: disabling port %d\n", port + 1); 302 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE); 303 } 304 } 305 306 307 static int usb_hub_configure(struct usb_device *dev) 308 { 309 int i, length; 310 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ); 311 unsigned char *bitmap; 312 short hubCharacteristics; 313 struct usb_hub_descriptor *descriptor; 314 struct usb_hub_device *hub; 315 __maybe_unused struct usb_hub_status *hubsts; 316 317 /* "allocate" Hub device */ 318 hub = usb_hub_allocate(); 319 if (hub == NULL) 320 return -1; 321 hub->pusb_dev = dev; 322 /* Get the the hub descriptor */ 323 if (usb_get_hub_descriptor(dev, buffer, 4) < 0) { 324 debug("usb_hub_configure: failed to get hub " \ 325 "descriptor, giving up %lX\n", dev->status); 326 return -1; 327 } 328 descriptor = (struct usb_hub_descriptor *)buffer; 329 330 length = min(descriptor->bLength, sizeof(struct usb_hub_descriptor)); 331 332 if (usb_get_hub_descriptor(dev, buffer, length) < 0) { 333 debug("usb_hub_configure: failed to get hub " \ 334 "descriptor 2nd giving up %lX\n", dev->status); 335 return -1; 336 } 337 memcpy((unsigned char *)&hub->desc, buffer, length); 338 /* adjust 16bit values */ 339 put_unaligned(le16_to_cpu(get_unaligned( 340 &descriptor->wHubCharacteristics)), 341 &hub->desc.wHubCharacteristics); 342 /* set the bitmap */ 343 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0]; 344 /* devices not removable by default */ 345 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); 346 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0]; 347 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */ 348 349 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 350 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i]; 351 352 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++) 353 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i]; 354 355 dev->maxchild = descriptor->bNbrPorts; 356 debug("%d ports detected\n", dev->maxchild); 357 358 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics); 359 switch (hubCharacteristics & HUB_CHAR_LPSM) { 360 case 0x00: 361 debug("ganged power switching\n"); 362 break; 363 case 0x01: 364 debug("individual port power switching\n"); 365 break; 366 case 0x02: 367 case 0x03: 368 debug("unknown reserved power switching mode\n"); 369 break; 370 } 371 372 if (hubCharacteristics & HUB_CHAR_COMPOUND) 373 debug("part of a compound device\n"); 374 else 375 debug("standalone hub\n"); 376 377 switch (hubCharacteristics & HUB_CHAR_OCPM) { 378 case 0x00: 379 debug("global over-current protection\n"); 380 break; 381 case 0x08: 382 debug("individual port over-current protection\n"); 383 break; 384 case 0x10: 385 case 0x18: 386 debug("no over-current protection\n"); 387 break; 388 } 389 390 debug("power on to power good time: %dms\n", 391 descriptor->bPwrOn2PwrGood * 2); 392 debug("hub controller current requirement: %dmA\n", 393 descriptor->bHubContrCurrent); 394 395 for (i = 0; i < dev->maxchild; i++) 396 debug("port %d is%s removable\n", i + 1, 397 hub->desc.DeviceRemovable[(i + 1) / 8] & \ 398 (1 << ((i + 1) % 8)) ? " not" : ""); 399 400 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) { 401 debug("usb_hub_configure: failed to get Status - " \ 402 "too long: %d\n", descriptor->bLength); 403 return -1; 404 } 405 406 if (usb_get_hub_status(dev, buffer) < 0) { 407 debug("usb_hub_configure: failed to get Status %lX\n", 408 dev->status); 409 return -1; 410 } 411 412 #ifdef DEBUG 413 hubsts = (struct usb_hub_status *)buffer; 414 #endif 415 416 debug("get_hub_status returned status %X, change %X\n", 417 le16_to_cpu(hubsts->wHubStatus), 418 le16_to_cpu(hubsts->wHubChange)); 419 debug("local power source is %s\n", 420 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \ 421 "lost (inactive)" : "good"); 422 debug("%sover-current condition exists\n", 423 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \ 424 "" : "no "); 425 usb_hub_power_on(hub); 426 427 /* 428 * Reset any devices that may be in a bad state when applying 429 * the power. This is a __weak function. Resetting of the devices 430 * should occur in the board file of the device. 431 */ 432 for (i = 0; i < dev->maxchild; i++) 433 usb_hub_reset_devices(i + 1); 434 435 for (i = 0; i < dev->maxchild; i++) { 436 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); 437 unsigned short portstatus, portchange; 438 int ret; 439 ulong start = get_timer(0); 440 441 /* 442 * Wait for (whichever finishes first) 443 * - A maximum of 10 seconds 444 * This is a purely observational value driven by connecting 445 * a few broken pen drives and taking the max * 1.5 approach 446 * - connection_change and connection state to report same 447 * state 448 */ 449 do { 450 ret = usb_get_port_status(dev, i + 1, portsts); 451 if (ret < 0) { 452 debug("get_port_status failed\n"); 453 break; 454 } 455 456 portstatus = le16_to_cpu(portsts->wPortStatus); 457 portchange = le16_to_cpu(portsts->wPortChange); 458 459 if ((portchange & USB_PORT_STAT_C_CONNECTION) == 460 (portstatus & USB_PORT_STAT_CONNECTION)) 461 break; 462 463 } while (get_timer(start) < CONFIG_SYS_HZ * 10); 464 465 if (ret < 0) 466 continue; 467 468 debug("Port %d Status %X Change %X\n", 469 i + 1, portstatus, portchange); 470 471 if (portchange & USB_PORT_STAT_C_CONNECTION) { 472 debug("port %d connection change\n", i + 1); 473 usb_hub_port_connect_change(dev, i); 474 } 475 if (portchange & USB_PORT_STAT_C_ENABLE) { 476 debug("port %d enable change, status %x\n", 477 i + 1, portstatus); 478 usb_clear_port_feature(dev, i + 1, 479 USB_PORT_FEAT_C_ENABLE); 480 /* 481 * The following hack causes a ghost device problem 482 * to Faraday EHCI 483 */ 484 #ifndef CONFIG_USB_EHCI_FARADAY 485 /* EM interference sometimes causes bad shielded USB 486 * devices to be shutdown by the hub, this hack enables 487 * them again. Works at least with mouse driver */ 488 if (!(portstatus & USB_PORT_STAT_ENABLE) && 489 (portstatus & USB_PORT_STAT_CONNECTION) && 490 ((dev->children[i]))) { 491 debug("already running port %i " \ 492 "disabled by hub (EMI?), " \ 493 "re-enabling...\n", i + 1); 494 usb_hub_port_connect_change(dev, i); 495 } 496 #endif 497 } 498 if (portstatus & USB_PORT_STAT_SUSPEND) { 499 debug("port %d suspend change\n", i + 1); 500 usb_clear_port_feature(dev, i + 1, 501 USB_PORT_FEAT_SUSPEND); 502 } 503 504 if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 505 debug("port %d over-current change\n", i + 1); 506 usb_clear_port_feature(dev, i + 1, 507 USB_PORT_FEAT_C_OVER_CURRENT); 508 usb_hub_power_on(hub); 509 } 510 511 if (portchange & USB_PORT_STAT_C_RESET) { 512 debug("port %d reset change\n", i + 1); 513 usb_clear_port_feature(dev, i + 1, 514 USB_PORT_FEAT_C_RESET); 515 } 516 } /* end for i all ports */ 517 518 return 0; 519 } 520 521 int usb_hub_probe(struct usb_device *dev, int ifnum) 522 { 523 struct usb_interface *iface; 524 struct usb_endpoint_descriptor *ep; 525 int ret; 526 527 iface = &dev->config.if_desc[ifnum]; 528 /* Is it a hub? */ 529 if (iface->desc.bInterfaceClass != USB_CLASS_HUB) 530 return 0; 531 /* Some hubs have a subclass of 1, which AFAICT according to the */ 532 /* specs is not defined, but it works */ 533 if ((iface->desc.bInterfaceSubClass != 0) && 534 (iface->desc.bInterfaceSubClass != 1)) 535 return 0; 536 /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 537 if (iface->desc.bNumEndpoints != 1) 538 return 0; 539 ep = &iface->ep_desc[0]; 540 /* Output endpoint? Curiousier and curiousier.. */ 541 if (!(ep->bEndpointAddress & USB_DIR_IN)) 542 return 0; 543 /* If it's not an interrupt endpoint, we'd better punt! */ 544 if ((ep->bmAttributes & 3) != 3) 545 return 0; 546 /* We found a hub */ 547 debug("USB hub found\n"); 548 ret = usb_hub_configure(dev); 549 return ret; 550 } 551