2 * Most of this source has been derived from the Linux USB
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)
15 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
17 * SPDX-License-Identifier: GPL-2.0+
20 /****************************************************************************
22 * Probes device for being a hub and configurate it
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>
36 #include <asm/state.h>
38 #include <asm/unaligned.h>
40 DECLARE_GLOBAL_DATA_PTR;
44 #define USB_BUFSIZ 512
46 #define HUB_SHORT_RESET_TIME 20
47 #define HUB_LONG_RESET_TIME 200
49 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
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;
58 static LIST_HEAD(usb_scan_list);
60 __weak void usb_hub_reset_devices(int port)
65 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
67 return hdev->descriptor.bDeviceProtocol == 3;
71 bool usb_hub_is_root_hub(struct udevice *hub)
73 if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
79 static int usb_set_hub_depth(struct usb_device *dev, int depth)
81 if (depth < 0 || depth > 4)
84 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
85 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
86 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
90 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
92 unsigned short dtype = USB_DT_HUB;
94 if (usb_hub_is_superspeed(dev))
95 dtype = USB_DT_SS_HUB;
97 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
98 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
99 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
102 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
104 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
105 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
106 port, NULL, 0, USB_CNTL_TIMEOUT);
109 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
111 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
112 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
113 port, NULL, 0, USB_CNTL_TIMEOUT);
116 static int usb_get_hub_status(struct usb_device *dev, void *data)
118 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
119 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
120 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
123 int usb_get_port_status(struct usb_device *dev, int port, void *data)
127 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
128 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
129 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
136 * Translate the USB 3.0 hub port status field into the old version
137 * that U-Boot understands. Do this only when the hub is not root hub.
138 * For root hub, the port status field has already been translated
139 * in the host controller driver (see xhci_submit_root() in xhci.c).
141 * Note: this only supports driver model.
144 if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
145 struct usb_port_status *status = (struct usb_port_status *)data;
146 u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
148 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
149 tmp |= USB_PORT_STAT_POWER;
150 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
151 USB_SS_PORT_STAT_SPEED_5GBPS)
152 tmp |= USB_PORT_STAT_SUPER_SPEED;
154 status->wPortStatus = tmp;
162 static void usb_hub_power_on(struct usb_hub_device *hub)
165 struct usb_device *dev;
166 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
171 debug("enabling power on all ports\n");
172 for (i = 0; i < dev->maxchild; i++) {
173 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
174 debug("port %d returns %lX\n", i + 1, dev->status);
177 #ifdef CONFIG_SANDBOX
179 * Don't set timeout / delay values here. This results
180 * in these values still being reset to 0.
182 if (state_get_skip_delays())
187 * Wait for power to become stable,
188 * plus spec-defined max time for device to connect
189 * but allow this time to be increased via env variable as some
190 * devices break the spec and require longer warm-up times
192 env = env_get("usb_pgood_delay");
194 pgood_delay = max(pgood_delay,
195 (unsigned)simple_strtol(env, NULL, 0));
196 debug("pgood_delay=%dms\n", pgood_delay);
199 * Do a minimum delay of the larger value of 100ms or pgood_delay
200 * so that the power can stablize before the devices are queried
202 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
205 * Record the power-on timeout here. The max. delay (timeout)
206 * will be done based on this value in the USB port loop in
207 * usb_hub_configure() later.
209 hub->connect_timeout = hub->query_delay + 1000;
210 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
211 dev->devnum, max(100, (int)pgood_delay),
212 max(100, (int)pgood_delay) + 1000);
215 #ifndef CONFIG_DM_USB
216 static struct usb_hub_device hub_dev[USB_MAX_HUB];
217 static int usb_hub_index;
219 void usb_hub_reset(void)
223 /* Zero out global hub_dev in case its re-used again */
224 memset(hub_dev, 0, sizeof(hub_dev));
227 static struct usb_hub_device *usb_hub_allocate(void)
229 if (usb_hub_index < USB_MAX_HUB)
230 return &hub_dev[usb_hub_index++];
232 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
239 static inline char *portspeed(int portstatus)
243 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
244 case USB_PORT_STAT_SUPER_SPEED:
245 speed_str = "5 Gb/s";
247 case USB_PORT_STAT_HIGH_SPEED:
248 speed_str = "480 Mb/s";
250 case USB_PORT_STAT_LOW_SPEED:
251 speed_str = "1.5 Mb/s";
254 speed_str = "12 Mb/s";
262 * usb_hub_port_reset() - reset a port given its usb_device pointer
264 * Reset a hub port and see if a device is present on that port, providing
265 * sufficient time for it to show itself. The port status is returned.
267 * @dev: USB device to reset
268 * @port: Port number to reset (note ports are numbered from 0 here)
269 * @portstat: Returns port status
271 static int usb_hub_port_reset(struct usb_device *dev, int port,
272 unsigned short *portstat)
275 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
276 unsigned short portstatus, portchange;
277 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
280 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
283 debug("%s: resetting port %d...\n", __func__, port + 1);
285 for (tries = 0; tries < MAX_TRIES; tries++) {
286 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
292 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
293 debug("get_port_status failed status %lX\n",
297 portstatus = le16_to_cpu(portsts->wPortStatus);
298 portchange = le16_to_cpu(portsts->wPortChange);
300 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
301 portspeed(portstatus));
303 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
304 " USB_PORT_STAT_ENABLE %d\n",
305 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
306 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
307 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
310 * Perhaps we should check for the following here:
311 * - C_CONNECTION hasn't been set.
312 * - CONNECTION is still set.
314 * Doing so would ensure that the device is still connected
315 * to the bus, and hasn't been unplugged or replaced while the
316 * USB bus reset was going on.
318 * However, if we do that, then (at least) a San Disk Ultra
319 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
320 * Tegra Jetson TK1 board. For some reason, the device appears
321 * to briefly drop off the bus when this second bus reset is
322 * executed, yet if we retry this loop, it'll eventually come
323 * back after another reset or two.
326 if (portstatus & USB_PORT_STAT_ENABLE)
329 /* Switch to long reset delay for the next round */
330 delay = HUB_LONG_RESET_TIME;
333 if (tries == MAX_TRIES) {
334 debug("Cannot enable port %i after %i retries, " \
335 "disabling port.\n", port + 1, MAX_TRIES);
336 debug("Maybe the USB cable is bad?\n");
340 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
341 *portstat = portstatus;
345 int usb_hub_port_connect_change(struct usb_device *dev, int port)
347 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
348 unsigned short portstatus;
352 ret = usb_get_port_status(dev, port + 1, portsts);
354 debug("get_port_status failed\n");
358 portstatus = le16_to_cpu(portsts->wPortStatus);
359 debug("portstatus %x, change %x, %s\n",
361 le16_to_cpu(portsts->wPortChange),
362 portspeed(portstatus));
364 /* Clear the connection change status */
365 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
367 /* Disconnect any existing devices under this port */
368 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
369 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
370 usb_device_has_child_on_port(dev, port)) {
371 debug("usb_disconnect(&hub->children[port]);\n");
372 /* Return now if nothing is connected */
373 if (!(portstatus & USB_PORT_STAT_CONNECTION))
378 ret = usb_hub_port_reset(dev, port, &portstatus);
381 printf("cannot reset port %i!?\n", port + 1);
385 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
386 case USB_PORT_STAT_SUPER_SPEED:
387 speed = USB_SPEED_SUPER;
389 case USB_PORT_STAT_HIGH_SPEED:
390 speed = USB_SPEED_HIGH;
392 case USB_PORT_STAT_LOW_SPEED:
393 speed = USB_SPEED_LOW;
396 speed = USB_SPEED_FULL;
401 struct udevice *child;
403 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
405 struct usb_device *usb;
407 ret = usb_alloc_new_device(dev->controller, &usb);
409 printf("cannot create new device: ret=%d", ret);
413 dev->children[port] = usb;
416 usb->portnr = port + 1;
417 /* Run it through the hoops (find a driver, etc) */
418 ret = usb_new_device(usb);
420 /* Woops, disable the port */
421 usb_free_device(dev->controller);
422 dev->children[port] = NULL;
426 debug("hub: disabling port %d\n", port + 1);
427 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
433 static int usb_scan_port(struct usb_device_scan *usb_scan)
435 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
436 unsigned short portstatus;
437 unsigned short portchange;
438 struct usb_device *dev;
439 struct usb_hub_device *hub;
448 * Don't talk to the device before the query delay is expired.
449 * This is needed for voltages to stabalize.
451 if (get_timer(0) < hub->query_delay)
454 ret = usb_get_port_status(dev, i + 1, portsts);
456 debug("get_port_status failed\n");
457 if (get_timer(0) >= hub->connect_timeout) {
458 debug("devnum=%d port=%d: timeout\n",
460 /* Remove this device from scanning list */
461 list_del(&usb_scan->list);
468 portstatus = le16_to_cpu(portsts->wPortStatus);
469 portchange = le16_to_cpu(portsts->wPortChange);
470 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
473 * No connection change happened, wait a bit more.
475 * For some situation, the hub reports no connection change but a
476 * device is connected to the port (eg: CCS bit is set but CSC is not
477 * in the PORTSC register of a root hub), ignore such case.
479 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
480 !(portstatus & USB_PORT_STAT_CONNECTION)) {
481 if (get_timer(0) >= hub->connect_timeout) {
482 debug("devnum=%d port=%d: timeout\n",
484 /* Remove this device from scanning list */
485 list_del(&usb_scan->list);
492 /* A new USB device is ready at this point */
493 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
495 usb_hub_port_connect_change(dev, i);
497 if (portchange & USB_PORT_STAT_C_ENABLE) {
498 debug("port %d enable change, status %x\n", i + 1, portstatus);
499 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
501 * The following hack causes a ghost device problem
504 #ifndef CONFIG_USB_EHCI_FARADAY
506 * EM interference sometimes causes bad shielded USB
507 * devices to be shutdown by the hub, this hack enables
508 * them again. Works at least with mouse driver
510 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
511 (portstatus & USB_PORT_STAT_CONNECTION) &&
512 usb_device_has_child_on_port(dev, i)) {
513 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
515 usb_hub_port_connect_change(dev, i);
520 if (portstatus & USB_PORT_STAT_SUSPEND) {
521 debug("port %d suspend change\n", i + 1);
522 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
525 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
526 debug("port %d over-current change\n", i + 1);
527 usb_clear_port_feature(dev, i + 1,
528 USB_PORT_FEAT_C_OVER_CURRENT);
529 /* Only power-on this one port */
530 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
531 hub->overcurrent_count[i]++;
534 * If the max-scan-count is not reached, return without removing
535 * the device from scan-list. This will re-issue a new scan.
537 if (hub->overcurrent_count[i] <=
538 PORT_OVERCURRENT_MAX_SCAN_COUNT)
541 /* Otherwise the device will get removed */
542 printf("Port %d over-current occurred %d times\n", i + 1,
543 hub->overcurrent_count[i]);
546 if (portchange & USB_PORT_STAT_C_RESET) {
547 debug("port %d reset change\n", i + 1);
548 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
552 * We're done with this device, so let's remove this device from
555 list_del(&usb_scan->list);
561 static int usb_device_list_scan(void)
563 struct usb_device_scan *usb_scan;
564 struct usb_device_scan *tmp;
568 /* Only run this loop once for each controller */
575 /* We're done, once the list is empty again */
576 if (list_empty(&usb_scan_list))
579 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
583 ret = usb_scan_port(usb_scan);
591 * This USB controller has finished scanning all its connected
592 * USB devices. Set "running" back to 0, so that other USB controllers
593 * will scan their devices too.
600 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
602 struct usb_hub_device *hub;
604 #ifndef CONFIG_DM_USB
605 /* "allocate" Hub device */
606 hub = usb_hub_allocate();
608 hub = dev_get_uclass_priv(dev->dev);
614 static int usb_hub_configure(struct usb_device *dev)
617 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
618 unsigned char *bitmap;
619 short hubCharacteristics;
620 struct usb_hub_descriptor *descriptor;
621 struct usb_hub_device *hub;
622 __maybe_unused struct usb_hub_status *hubsts;
625 hub = usb_get_hub_device(dev);
630 /* Get the the hub descriptor */
631 ret = usb_get_hub_descriptor(dev, buffer, 4);
633 debug("usb_hub_configure: failed to get hub " \
634 "descriptor, giving up %lX\n", dev->status);
637 descriptor = (struct usb_hub_descriptor *)buffer;
639 length = min_t(int, descriptor->bLength,
640 sizeof(struct usb_hub_descriptor));
642 ret = usb_get_hub_descriptor(dev, buffer, length);
644 debug("usb_hub_configure: failed to get hub " \
645 "descriptor 2nd giving up %lX\n", dev->status);
648 memcpy((unsigned char *)&hub->desc, buffer, length);
649 /* adjust 16bit values */
650 put_unaligned(le16_to_cpu(get_unaligned(
651 &descriptor->wHubCharacteristics)),
652 &hub->desc.wHubCharacteristics);
654 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
655 /* devices not removable by default */
656 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
657 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
658 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
660 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
661 hub->desc.u.hs.DeviceRemovable[i] =
662 descriptor->u.hs.DeviceRemovable[i];
664 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
665 hub->desc.u.hs.PortPowerCtrlMask[i] =
666 descriptor->u.hs.PortPowerCtrlMask[i];
668 dev->maxchild = descriptor->bNbrPorts;
669 debug("%d ports detected\n", dev->maxchild);
671 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
672 switch (hubCharacteristics & HUB_CHAR_LPSM) {
674 debug("ganged power switching\n");
677 debug("individual port power switching\n");
681 debug("unknown reserved power switching mode\n");
685 if (hubCharacteristics & HUB_CHAR_COMPOUND)
686 debug("part of a compound device\n");
688 debug("standalone hub\n");
690 switch (hubCharacteristics & HUB_CHAR_OCPM) {
692 debug("global over-current protection\n");
695 debug("individual port over-current protection\n");
699 debug("no over-current protection\n");
703 switch (dev->descriptor.bDeviceProtocol) {
706 case USB_HUB_PR_HS_SINGLE_TT:
707 debug("Single TT\n");
709 case USB_HUB_PR_HS_MULTI_TT:
710 ret = usb_set_interface(dev, 0, 1);
712 debug("TT per port\n");
713 hub->tt.multi = true;
715 debug("Using single TT (err %d)\n", ret);
719 /* USB 3.0 hubs don't have a TT */
722 debug("Unrecognized hub protocol %d\n",
723 dev->descriptor.bDeviceProtocol);
727 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
728 switch (hubCharacteristics & HUB_CHAR_TTTT) {
729 case HUB_TTTT_8_BITS:
730 if (dev->descriptor.bDeviceProtocol != 0) {
731 hub->tt.think_time = 666;
732 debug("TT requires at most %d FS bit times (%d ns)\n",
733 8, hub->tt.think_time);
736 case HUB_TTTT_16_BITS:
737 hub->tt.think_time = 666 * 2;
738 debug("TT requires at most %d FS bit times (%d ns)\n",
739 16, hub->tt.think_time);
741 case HUB_TTTT_24_BITS:
742 hub->tt.think_time = 666 * 3;
743 debug("TT requires at most %d FS bit times (%d ns)\n",
744 24, hub->tt.think_time);
746 case HUB_TTTT_32_BITS:
747 hub->tt.think_time = 666 * 4;
748 debug("TT requires at most %d FS bit times (%d ns)\n",
749 32, hub->tt.think_time);
753 debug("power on to power good time: %dms\n",
754 descriptor->bPwrOn2PwrGood * 2);
755 debug("hub controller current requirement: %dmA\n",
756 descriptor->bHubContrCurrent);
758 for (i = 0; i < dev->maxchild; i++)
759 debug("port %d is%s removable\n", i + 1,
760 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
761 (1 << ((i + 1) % 8)) ? " not" : "");
763 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
764 debug("usb_hub_configure: failed to get Status - " \
765 "too long: %d\n", descriptor->bLength);
769 ret = usb_get_hub_status(dev, buffer);
771 debug("usb_hub_configure: failed to get Status %lX\n",
777 hubsts = (struct usb_hub_status *)buffer;
780 debug("get_hub_status returned status %X, change %X\n",
781 le16_to_cpu(hubsts->wHubStatus),
782 le16_to_cpu(hubsts->wHubChange));
783 debug("local power source is %s\n",
784 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
785 "lost (inactive)" : "good");
786 debug("%sover-current condition exists\n",
787 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
792 * Update USB host controller's internal representation of this hub
793 * after the hub descriptor is fetched.
795 ret = usb_update_hub_device(dev);
796 if (ret < 0 && ret != -ENOSYS) {
797 debug("%s: failed to update hub device for HCD (%x)\n",
803 * A maximum of seven tiers are allowed in a USB topology, and the
804 * root hub occupies the first tier. The last tier ends with a normal
805 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
806 * to route packets to the designated downstream port. The hub uses a
807 * hub depth value multiplied by four as an offset into the 'route
808 * string' to locate the bits it uses to determine the downstream
811 if (usb_hub_is_root_hub(dev->dev)) {
814 struct udevice *hdev;
817 hdev = dev->dev->parent;
818 while (!usb_hub_is_root_hub(hdev)) {
823 hub->hub_depth = depth;
825 if (usb_hub_is_superspeed(dev)) {
826 debug("set hub (%p) depth to %d\n", dev, depth);
828 * This request sets the value that the hub uses to
829 * determine the index into the 'route string index'
832 ret = usb_set_hub_depth(dev, depth);
834 debug("%s: failed to set hub depth (%lX)\n",
835 __func__, dev->status);
842 usb_hub_power_on(hub);
845 * Reset any devices that may be in a bad state when applying
846 * the power. This is a __weak function. Resetting of the devices
847 * should occur in the board file of the device.
849 for (i = 0; i < dev->maxchild; i++)
850 usb_hub_reset_devices(i + 1);
853 * Only add the connected USB devices, including potential hubs,
854 * to a scanning list. This list will get scanned and devices that
855 * are detected (either via port connected or via port timeout)
856 * will get removed from this list. Scanning of the devices on this
857 * list will continue until all devices are removed.
859 for (i = 0; i < dev->maxchild; i++) {
860 struct usb_device_scan *usb_scan;
862 usb_scan = calloc(1, sizeof(*usb_scan));
864 printf("Can't allocate memory for USB device!\n");
870 list_add_tail(&usb_scan->list, &usb_scan_list);
874 * And now call the scanning code which loops over the generated list
876 ret = usb_device_list_scan();
881 static int usb_hub_check(struct usb_device *dev, int ifnum)
883 struct usb_interface *iface;
884 struct usb_endpoint_descriptor *ep = NULL;
886 iface = &dev->config.if_desc[ifnum];
888 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
890 /* Some hubs have a subclass of 1, which AFAICT according to the */
891 /* specs is not defined, but it works */
892 if ((iface->desc.bInterfaceSubClass != 0) &&
893 (iface->desc.bInterfaceSubClass != 1))
895 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
896 if (iface->desc.bNumEndpoints != 1)
898 ep = &iface->ep_desc[0];
899 /* Output endpoint? Curiousier and curiousier.. */
900 if (!(ep->bEndpointAddress & USB_DIR_IN))
902 /* If it's not an interrupt endpoint, we'd better punt! */
903 if ((ep->bmAttributes & 3) != 3)
906 debug("USB hub found\n");
910 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
911 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
912 iface->desc.bNumEndpoints);
914 debug(" bEndpointAddress=%#x, bmAttributes=%d",
915 ep->bEndpointAddress, ep->bmAttributes);
921 int usb_hub_probe(struct usb_device *dev, int ifnum)
925 ret = usb_hub_check(dev, ifnum);
928 ret = usb_hub_configure(dev);
933 int usb_hub_scan(struct udevice *hub)
935 struct usb_device *udev = dev_get_parent_priv(hub);
937 return usb_hub_configure(udev);
940 static int usb_hub_post_probe(struct udevice *dev)
942 debug("%s\n", __func__);
943 return usb_hub_scan(dev);
946 static const struct udevice_id usb_hub_ids[] = {
947 { .compatible = "usb-hub" },
951 U_BOOT_DRIVER(usb_generic_hub) = {
953 .id = UCLASS_USB_HUB,
954 .of_match = usb_hub_ids,
955 .flags = DM_FLAG_ALLOC_PRIV_DMA,
958 UCLASS_DRIVER(usb_hub) = {
959 .id = UCLASS_USB_HUB,
961 .post_bind = dm_scan_fdt_dev,
962 .post_probe = usb_hub_post_probe,
963 .child_pre_probe = usb_child_pre_probe,
964 .per_child_auto_alloc_size = sizeof(struct usb_device),
965 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
966 .per_device_auto_alloc_size = sizeof(struct usb_hub_device),
969 static const struct usb_device_id hub_id_table[] = {
971 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
972 .bDeviceClass = USB_CLASS_HUB
974 { } /* Terminating entry */
977 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);