xref: /openbmc/u-boot/common/usb_hub.c (revision 83bf0057)
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 <asm/byteorder.h>
34 #include <asm/unaligned.h>
35 #include <dm/root.h>
36 
37 DECLARE_GLOBAL_DATA_PTR;
38 
39 #include <usb.h>
40 #ifdef CONFIG_4xx
41 #include <asm/4xx_pci.h>
42 #endif
43 
44 #define USB_BUFSIZ	512
45 
46 /* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
47 static struct usb_hub_device hub_dev[USB_MAX_HUB];
48 static int usb_hub_index;
49 
50 __weak void usb_hub_reset_devices(int port)
51 {
52 	return;
53 }
54 
55 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
56 {
57 	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
58 		USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
59 		USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
60 }
61 
62 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
63 {
64 	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
65 				USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
66 				port, NULL, 0, USB_CNTL_TIMEOUT);
67 }
68 
69 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
70 {
71 	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
72 				USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
73 				port, NULL, 0, USB_CNTL_TIMEOUT);
74 }
75 
76 static int usb_get_hub_status(struct usb_device *dev, void *data)
77 {
78 	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
79 			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
80 			data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
81 }
82 
83 int usb_get_port_status(struct usb_device *dev, int port, void *data)
84 {
85 	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
86 			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
87 			data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
88 }
89 
90 
91 static void usb_hub_power_on(struct usb_hub_device *hub)
92 {
93 	int i;
94 	struct usb_device *dev;
95 	unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
96 	const char *env;
97 
98 	dev = hub->pusb_dev;
99 
100 	debug("enabling power on all ports\n");
101 	for (i = 0; i < dev->maxchild; i++) {
102 		usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
103 		debug("port %d returns %lX\n", i + 1, dev->status);
104 	}
105 
106 	/*
107 	 * Wait for power to become stable,
108 	 * plus spec-defined max time for device to connect
109 	 * but allow this time to be increased via env variable as some
110 	 * devices break the spec and require longer warm-up times
111 	 */
112 	env = getenv("usb_pgood_delay");
113 	if (env)
114 		pgood_delay = max(pgood_delay,
115 			          (unsigned)simple_strtol(env, NULL, 0));
116 	debug("pgood_delay=%dms\n", pgood_delay);
117 	mdelay(pgood_delay + 1000);
118 }
119 
120 void usb_hub_reset(void)
121 {
122 	usb_hub_index = 0;
123 }
124 
125 static struct usb_hub_device *usb_hub_allocate(void)
126 {
127 	if (usb_hub_index < USB_MAX_HUB)
128 		return &hub_dev[usb_hub_index++];
129 
130 	printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
131 	return NULL;
132 }
133 
134 #define MAX_TRIES 5
135 
136 static inline char *portspeed(int portstatus)
137 {
138 	char *speed_str;
139 
140 	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
141 	case USB_PORT_STAT_SUPER_SPEED:
142 		speed_str = "5 Gb/s";
143 		break;
144 	case USB_PORT_STAT_HIGH_SPEED:
145 		speed_str = "480 Mb/s";
146 		break;
147 	case USB_PORT_STAT_LOW_SPEED:
148 		speed_str = "1.5 Mb/s";
149 		break;
150 	default:
151 		speed_str = "12 Mb/s";
152 		break;
153 	}
154 
155 	return speed_str;
156 }
157 
158 int legacy_hub_port_reset(struct usb_device *dev, int port,
159 			unsigned short *portstat)
160 {
161 	int err, tries;
162 	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
163 	unsigned short portstatus, portchange;
164 
165 #ifdef CONFIG_DM_USB
166 	debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
167 	      port + 1);
168 #else
169 	debug("%s: resetting port %d...\n", __func__, port + 1);
170 #endif
171 	for (tries = 0; tries < MAX_TRIES; tries++) {
172 		err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
173 		if (err < 0)
174 			return err;
175 
176 		mdelay(200);
177 
178 		if (usb_get_port_status(dev, port + 1, portsts) < 0) {
179 			debug("get_port_status failed status %lX\n",
180 			      dev->status);
181 			return -1;
182 		}
183 		portstatus = le16_to_cpu(portsts->wPortStatus);
184 		portchange = le16_to_cpu(portsts->wPortChange);
185 
186 		debug("portstatus %x, change %x, %s\n", portstatus, portchange,
187 							portspeed(portstatus));
188 
189 		debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
190 		      "  USB_PORT_STAT_ENABLE %d\n",
191 		      (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
192 		      (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
193 		      (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
194 
195 		/*
196 		 * Perhaps we should check for the following here:
197 		 * - C_CONNECTION hasn't been set.
198 		 * - CONNECTION is still set.
199 		 *
200 		 * Doing so would ensure that the device is still connected
201 		 * to the bus, and hasn't been unplugged or replaced while the
202 		 * USB bus reset was going on.
203 		 *
204 		 * However, if we do that, then (at least) a San Disk Ultra
205 		 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
206 		 * Tegra Jetson TK1 board. For some reason, the device appears
207 		 * to briefly drop off the bus when this second bus reset is
208 		 * executed, yet if we retry this loop, it'll eventually come
209 		 * back after another reset or two.
210 		 */
211 
212 		if (portstatus & USB_PORT_STAT_ENABLE)
213 			break;
214 
215 		mdelay(200);
216 	}
217 
218 	if (tries == MAX_TRIES) {
219 		debug("Cannot enable port %i after %i retries, " \
220 		      "disabling port.\n", port + 1, MAX_TRIES);
221 		debug("Maybe the USB cable is bad?\n");
222 		return -1;
223 	}
224 
225 	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
226 	*portstat = portstatus;
227 	return 0;
228 }
229 
230 #ifdef CONFIG_DM_USB
231 int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
232 {
233 	struct usb_device *udev = dev_get_parent_priv(dev);
234 
235 	return legacy_hub_port_reset(udev, port, portstat);
236 }
237 #endif
238 
239 int usb_hub_port_connect_change(struct usb_device *dev, int port)
240 {
241 	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
242 	unsigned short portstatus;
243 	int ret, speed;
244 
245 	/* Check status */
246 	ret = usb_get_port_status(dev, port + 1, portsts);
247 	if (ret < 0) {
248 		debug("get_port_status failed\n");
249 		return ret;
250 	}
251 
252 	portstatus = le16_to_cpu(portsts->wPortStatus);
253 	debug("portstatus %x, change %x, %s\n",
254 	      portstatus,
255 	      le16_to_cpu(portsts->wPortChange),
256 	      portspeed(portstatus));
257 
258 	/* Clear the connection change status */
259 	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
260 
261 	/* Disconnect any existing devices under this port */
262 	if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
263 	     (!(portstatus & USB_PORT_STAT_ENABLE))) ||
264 	    usb_device_has_child_on_port(dev, port)) {
265 		debug("usb_disconnect(&hub->children[port]);\n");
266 		/* Return now if nothing is connected */
267 		if (!(portstatus & USB_PORT_STAT_CONNECTION))
268 			return -ENOTCONN;
269 	}
270 	mdelay(200);
271 
272 	/* Reset the port */
273 	ret = legacy_hub_port_reset(dev, port, &portstatus);
274 	if (ret < 0) {
275 		if (ret != -ENXIO)
276 			printf("cannot reset port %i!?\n", port + 1);
277 		return ret;
278 	}
279 
280 	mdelay(200);
281 
282 	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
283 	case USB_PORT_STAT_SUPER_SPEED:
284 		speed = USB_SPEED_SUPER;
285 		break;
286 	case USB_PORT_STAT_HIGH_SPEED:
287 		speed = USB_SPEED_HIGH;
288 		break;
289 	case USB_PORT_STAT_LOW_SPEED:
290 		speed = USB_SPEED_LOW;
291 		break;
292 	default:
293 		speed = USB_SPEED_FULL;
294 		break;
295 	}
296 
297 #ifdef CONFIG_DM_USB
298 	struct udevice *child;
299 
300 	ret = usb_scan_device(dev->dev, port + 1, speed, &child);
301 #else
302 	struct usb_device *usb;
303 
304 	ret = usb_alloc_new_device(dev->controller, &usb);
305 	if (ret) {
306 		printf("cannot create new device: ret=%d", ret);
307 		return ret;
308 	}
309 
310 	dev->children[port] = usb;
311 	usb->speed = speed;
312 	usb->parent = dev;
313 	usb->portnr = port + 1;
314 	/* Run it through the hoops (find a driver, etc) */
315 	ret = usb_new_device(usb);
316 	if (ret < 0) {
317 		/* Woops, disable the port */
318 		usb_free_device(dev->controller);
319 		dev->children[port] = NULL;
320 	}
321 #endif
322 	if (ret < 0) {
323 		debug("hub: disabling port %d\n", port + 1);
324 		usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
325 	}
326 
327 	return ret;
328 }
329 
330 
331 static int usb_hub_configure(struct usb_device *dev)
332 {
333 	int i, length;
334 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
335 	unsigned char *bitmap;
336 	short hubCharacteristics;
337 	struct usb_hub_descriptor *descriptor;
338 	struct usb_hub_device *hub;
339 	__maybe_unused struct usb_hub_status *hubsts;
340 	int ret;
341 
342 	/* "allocate" Hub device */
343 	hub = usb_hub_allocate();
344 	if (hub == NULL)
345 		return -ENOMEM;
346 	hub->pusb_dev = dev;
347 	/* Get the the hub descriptor */
348 	ret = usb_get_hub_descriptor(dev, buffer, 4);
349 	if (ret < 0) {
350 		debug("usb_hub_configure: failed to get hub " \
351 		      "descriptor, giving up %lX\n", dev->status);
352 		return ret;
353 	}
354 	descriptor = (struct usb_hub_descriptor *)buffer;
355 
356 	length = min_t(int, descriptor->bLength,
357 		       sizeof(struct usb_hub_descriptor));
358 
359 	ret = usb_get_hub_descriptor(dev, buffer, length);
360 	if (ret < 0) {
361 		debug("usb_hub_configure: failed to get hub " \
362 		      "descriptor 2nd giving up %lX\n", dev->status);
363 		return ret;
364 	}
365 	memcpy((unsigned char *)&hub->desc, buffer, length);
366 	/* adjust 16bit values */
367 	put_unaligned(le16_to_cpu(get_unaligned(
368 			&descriptor->wHubCharacteristics)),
369 			&hub->desc.wHubCharacteristics);
370 	/* set the bitmap */
371 	bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
372 	/* devices not removable by default */
373 	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
374 	bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
375 	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
376 
377 	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
378 		hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
379 
380 	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
381 		hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
382 
383 	dev->maxchild = descriptor->bNbrPorts;
384 	debug("%d ports detected\n", dev->maxchild);
385 
386 	hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
387 	switch (hubCharacteristics & HUB_CHAR_LPSM) {
388 	case 0x00:
389 		debug("ganged power switching\n");
390 		break;
391 	case 0x01:
392 		debug("individual port power switching\n");
393 		break;
394 	case 0x02:
395 	case 0x03:
396 		debug("unknown reserved power switching mode\n");
397 		break;
398 	}
399 
400 	if (hubCharacteristics & HUB_CHAR_COMPOUND)
401 		debug("part of a compound device\n");
402 	else
403 		debug("standalone hub\n");
404 
405 	switch (hubCharacteristics & HUB_CHAR_OCPM) {
406 	case 0x00:
407 		debug("global over-current protection\n");
408 		break;
409 	case 0x08:
410 		debug("individual port over-current protection\n");
411 		break;
412 	case 0x10:
413 	case 0x18:
414 		debug("no over-current protection\n");
415 		break;
416 	}
417 
418 	debug("power on to power good time: %dms\n",
419 	      descriptor->bPwrOn2PwrGood * 2);
420 	debug("hub controller current requirement: %dmA\n",
421 	      descriptor->bHubContrCurrent);
422 
423 	for (i = 0; i < dev->maxchild; i++)
424 		debug("port %d is%s removable\n", i + 1,
425 		      hub->desc.DeviceRemovable[(i + 1) / 8] & \
426 		      (1 << ((i + 1) % 8)) ? " not" : "");
427 
428 	if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
429 		debug("usb_hub_configure: failed to get Status - " \
430 		      "too long: %d\n", descriptor->bLength);
431 		return -EFBIG;
432 	}
433 
434 	ret = usb_get_hub_status(dev, buffer);
435 	if (ret < 0) {
436 		debug("usb_hub_configure: failed to get Status %lX\n",
437 		      dev->status);
438 		return ret;
439 	}
440 
441 #ifdef DEBUG
442 	hubsts = (struct usb_hub_status *)buffer;
443 #endif
444 
445 	debug("get_hub_status returned status %X, change %X\n",
446 	      le16_to_cpu(hubsts->wHubStatus),
447 	      le16_to_cpu(hubsts->wHubChange));
448 	debug("local power source is %s\n",
449 	      (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
450 	      "lost (inactive)" : "good");
451 	debug("%sover-current condition exists\n",
452 	      (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
453 	      "" : "no ");
454 	usb_hub_power_on(hub);
455 
456 	/*
457 	 * Reset any devices that may be in a bad state when applying
458 	 * the power.  This is a __weak function.  Resetting of the devices
459 	 * should occur in the board file of the device.
460 	 */
461 	for (i = 0; i < dev->maxchild; i++)
462 		usb_hub_reset_devices(i + 1);
463 
464 	for (i = 0; i < dev->maxchild; i++) {
465 		ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
466 		unsigned short portstatus, portchange;
467 		int ret;
468 		ulong start = get_timer(0);
469 
470 #ifdef CONFIG_DM_USB
471 		debug("\n\nScanning '%s' port %d\n", dev->dev->name, i + 1);
472 #else
473 		debug("\n\nScanning port %d\n", i + 1);
474 #endif
475 		/*
476 		 * Wait for (whichever finishes first)
477 		 *  - A maximum of 10 seconds
478 		 *    This is a purely observational value driven by connecting
479 		 *    a few broken pen drives and taking the max * 1.5 approach
480 		 *  - connection_change and connection state to report same
481 		 *    state
482 		 */
483 		do {
484 			ret = usb_get_port_status(dev, i + 1, portsts);
485 			if (ret < 0) {
486 				debug("get_port_status failed\n");
487 				break;
488 			}
489 
490 			portstatus = le16_to_cpu(portsts->wPortStatus);
491 			portchange = le16_to_cpu(portsts->wPortChange);
492 
493 			/* No connection change happened, wait a bit more. */
494 			if (!(portchange & USB_PORT_STAT_C_CONNECTION))
495 				continue;
496 
497 			/* Test if the connection came up, and if so, exit. */
498 			if (portstatus & USB_PORT_STAT_CONNECTION)
499 				break;
500 
501 		} while (get_timer(start) < CONFIG_SYS_HZ * 1);
502 
503 		if (ret < 0)
504 			continue;
505 
506 		debug("Port %d Status %X Change %X\n",
507 		      i + 1, portstatus, portchange);
508 
509 		if (portchange & USB_PORT_STAT_C_CONNECTION) {
510 			debug("port %d connection change\n", i + 1);
511 			usb_hub_port_connect_change(dev, i);
512 		}
513 		if (portchange & USB_PORT_STAT_C_ENABLE) {
514 			debug("port %d enable change, status %x\n",
515 			      i + 1, portstatus);
516 			usb_clear_port_feature(dev, i + 1,
517 						USB_PORT_FEAT_C_ENABLE);
518 			/*
519 			 * The following hack causes a ghost device problem
520 			 * to Faraday EHCI
521 			 */
522 #ifndef CONFIG_USB_EHCI_FARADAY
523 			/* EM interference sometimes causes bad shielded USB
524 			 * devices to be shutdown by the hub, this hack enables
525 			 * them again. Works at least with mouse driver */
526 			if (!(portstatus & USB_PORT_STAT_ENABLE) &&
527 			     (portstatus & USB_PORT_STAT_CONNECTION) &&
528 			     usb_device_has_child_on_port(dev, i)) {
529 				debug("already running port %i "  \
530 				      "disabled by hub (EMI?), " \
531 				      "re-enabling...\n", i + 1);
532 				      usb_hub_port_connect_change(dev, i);
533 			}
534 #endif
535 		}
536 		if (portstatus & USB_PORT_STAT_SUSPEND) {
537 			debug("port %d suspend change\n", i + 1);
538 			usb_clear_port_feature(dev, i + 1,
539 						USB_PORT_FEAT_SUSPEND);
540 		}
541 
542 		if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
543 			debug("port %d over-current change\n", i + 1);
544 			usb_clear_port_feature(dev, i + 1,
545 						USB_PORT_FEAT_C_OVER_CURRENT);
546 			usb_hub_power_on(hub);
547 		}
548 
549 		if (portchange & USB_PORT_STAT_C_RESET) {
550 			debug("port %d reset change\n", i + 1);
551 			usb_clear_port_feature(dev, i + 1,
552 						USB_PORT_FEAT_C_RESET);
553 		}
554 	} /* end for i all ports */
555 
556 	return 0;
557 }
558 
559 static int usb_hub_check(struct usb_device *dev, int ifnum)
560 {
561 	struct usb_interface *iface;
562 	struct usb_endpoint_descriptor *ep = NULL;
563 
564 	iface = &dev->config.if_desc[ifnum];
565 	/* Is it a hub? */
566 	if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
567 		goto err;
568 	/* Some hubs have a subclass of 1, which AFAICT according to the */
569 	/*  specs is not defined, but it works */
570 	if ((iface->desc.bInterfaceSubClass != 0) &&
571 	    (iface->desc.bInterfaceSubClass != 1))
572 		goto err;
573 	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
574 	if (iface->desc.bNumEndpoints != 1)
575 		goto err;
576 	ep = &iface->ep_desc[0];
577 	/* Output endpoint? Curiousier and curiousier.. */
578 	if (!(ep->bEndpointAddress & USB_DIR_IN))
579 		goto err;
580 	/* If it's not an interrupt endpoint, we'd better punt! */
581 	if ((ep->bmAttributes & 3) != 3)
582 		goto err;
583 	/* We found a hub */
584 	debug("USB hub found\n");
585 	return 0;
586 
587 err:
588 	debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
589 	      iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
590 	      iface->desc.bNumEndpoints);
591 	if (ep) {
592 		debug("   bEndpointAddress=%#x, bmAttributes=%d",
593 		      ep->bEndpointAddress, ep->bmAttributes);
594 	}
595 
596 	return -ENOENT;
597 }
598 
599 int usb_hub_probe(struct usb_device *dev, int ifnum)
600 {
601 	int ret;
602 
603 	ret = usb_hub_check(dev, ifnum);
604 	if (ret)
605 		return 0;
606 	ret = usb_hub_configure(dev);
607 	return ret;
608 }
609 
610 #ifdef CONFIG_DM_USB
611 int usb_hub_scan(struct udevice *hub)
612 {
613 	struct usb_device *udev = dev_get_parent_priv(hub);
614 
615 	return usb_hub_configure(udev);
616 }
617 
618 static int usb_hub_post_bind(struct udevice *dev)
619 {
620 	/* Scan the bus for devices */
621 	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
622 }
623 
624 static int usb_hub_post_probe(struct udevice *dev)
625 {
626 	debug("%s\n", __func__);
627 	return usb_hub_scan(dev);
628 }
629 
630 static const struct udevice_id usb_hub_ids[] = {
631 	{ .compatible = "usb-hub" },
632 	{ }
633 };
634 
635 U_BOOT_DRIVER(usb_generic_hub) = {
636 	.name	= "usb_hub",
637 	.id	= UCLASS_USB_HUB,
638 	.of_match = usb_hub_ids,
639 	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
640 };
641 
642 UCLASS_DRIVER(usb_hub) = {
643 	.id		= UCLASS_USB_HUB,
644 	.name		= "usb_hub",
645 	.post_bind	= usb_hub_post_bind,
646 	.post_probe	= usb_hub_post_probe,
647 	.child_pre_probe	= usb_child_pre_probe,
648 	.per_child_auto_alloc_size = sizeof(struct usb_device),
649 	.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
650 };
651 
652 static const struct usb_device_id hub_id_table[] = {
653 	{
654 		.match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
655 		.bDeviceClass = USB_CLASS_HUB
656 	},
657 	{ }	/* Terminating entry */
658 };
659 
660 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);
661 
662 #endif
663