1 // SPDX-License-Identifier: GPL-2.0+
3 * Most of this source has been derived from the Linux USB
5 * (C) Copyright Linus Torvalds 1999
6 * (C) Copyright Johannes Erdfelt 1999-2001
7 * (C) Copyright Andreas Gal 1999
8 * (C) Copyright Gregory P. Smith 1999
9 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
10 * (C) Copyright Randy Dunlap 2000
11 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
12 * (C) Copyright Yggdrasil Computing, Inc. 2000
13 * (usb_device_id matching changes by Adam J. Richter)
16 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
19 /****************************************************************************
21 * Probes device for being a hub and configurate it
32 #include <asm/processor.h>
33 #include <asm/unaligned.h>
34 #include <linux/ctype.h>
35 #include <linux/delay.h>
36 #include <linux/list.h>
37 #include <asm/byteorder.h>
39 #include <asm/state.h>
41 #include <asm/unaligned.h>
45 #define USB_BUFSIZ 512
47 #define HUB_SHORT_RESET_TIME 20
48 #define HUB_LONG_RESET_TIME 200
50 #define HUB_DEBOUNCE_TIMEOUT 1000
52 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
54 struct usb_device_scan {
55 struct usb_device *dev; /* USB hub device to scan */
56 struct usb_hub_device *hub; /* USB hub struct */
57 int port; /* USB port to scan */
58 struct list_head list;
61 static LIST_HEAD(usb_scan_list);
63 __weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
68 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
70 return hdev->descriptor.bDeviceProtocol == 3;
73 #if CONFIG_IS_ENABLED(DM_USB)
74 bool usb_hub_is_root_hub(struct udevice *hub)
76 if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
82 static int usb_set_hub_depth(struct usb_device *dev, int depth)
84 if (depth < 0 || depth > 4)
87 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
88 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
89 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
93 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
95 unsigned short dtype = USB_DT_HUB;
97 if (usb_hub_is_superspeed(dev))
98 dtype = USB_DT_SS_HUB;
100 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
101 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
102 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
105 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
107 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
108 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
109 port, NULL, 0, USB_CNTL_TIMEOUT);
112 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
114 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
115 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
116 port, NULL, 0, USB_CNTL_TIMEOUT);
119 static int usb_get_hub_status(struct usb_device *dev, void *data)
121 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
122 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
123 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
126 int usb_get_port_status(struct usb_device *dev, int port, void *data)
130 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
131 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
132 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
134 #if CONFIG_IS_ENABLED(DM_USB)
139 * Translate the USB 3.0 hub port status field into the old version
140 * that U-Boot understands. Do this only when the hub is not root hub.
141 * For root hub, the port status field has already been translated
142 * in the host controller driver (see xhci_submit_root() in xhci.c).
144 * Note: this only supports driver model.
147 if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
148 struct usb_port_status *status = (struct usb_port_status *)data;
149 u16 tmp = le16_to_cpu(status->wPortStatus) &
150 USB_SS_PORT_STAT_MASK;
152 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
153 tmp |= USB_PORT_STAT_POWER;
154 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
155 USB_SS_PORT_STAT_SPEED_5GBPS)
156 tmp |= USB_PORT_STAT_SUPER_SPEED;
158 status->wPortStatus = cpu_to_le16(tmp);
166 static void usb_hub_power_on(struct usb_hub_device *hub)
169 struct usb_device *dev;
170 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
171 const char __maybe_unused *env;
175 debug("enabling power on all ports\n");
176 for (i = 0; i < dev->maxchild; i++) {
177 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
178 debug("port %d returns %lX\n", i + 1, dev->status);
181 #ifdef CONFIG_SANDBOX
183 * Don't set timeout / delay values here. This results
184 * in these values still being reset to 0.
186 if (state_get_skip_delays())
191 * Wait for power to become stable,
192 * plus spec-defined max time for device to connect
193 * but allow this time to be increased via env variable as some
194 * devices break the spec and require longer warm-up times
196 #if CONFIG_IS_ENABLED(ENV_SUPPORT)
197 env = env_get("usb_pgood_delay");
199 pgood_delay = max(pgood_delay,
200 (unsigned)simple_strtol(env, NULL, 0));
202 debug("pgood_delay=%dms\n", pgood_delay);
205 * Do a minimum delay of the larger value of 100ms or pgood_delay
206 * so that the power can stablize before the devices are queried
208 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
211 * Record the power-on timeout here. The max. delay (timeout)
212 * will be done based on this value in the USB port loop in
213 * usb_hub_configure() later.
215 hub->connect_timeout = hub->query_delay + HUB_DEBOUNCE_TIMEOUT;
216 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
217 dev->devnum, max(100, (int)pgood_delay),
218 max(100, (int)pgood_delay) + HUB_DEBOUNCE_TIMEOUT);
221 #if !CONFIG_IS_ENABLED(DM_USB)
222 static struct usb_hub_device hub_dev[USB_MAX_HUB];
223 static int usb_hub_index;
225 void usb_hub_reset(void)
229 /* Zero out global hub_dev in case its re-used again */
230 memset(hub_dev, 0, sizeof(hub_dev));
233 static struct usb_hub_device *usb_hub_allocate(void)
235 if (usb_hub_index < USB_MAX_HUB)
236 return &hub_dev[usb_hub_index++];
238 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
245 static inline const char *portspeed(int portstatus)
247 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
248 case USB_PORT_STAT_SUPER_SPEED:
250 case USB_PORT_STAT_HIGH_SPEED:
252 case USB_PORT_STAT_LOW_SPEED:
260 * usb_hub_port_reset() - reset a port given its usb_device pointer
262 * Reset a hub port and see if a device is present on that port, providing
263 * sufficient time for it to show itself. The port status is returned.
265 * @dev: USB device to reset
266 * @port: Port number to reset (note ports are numbered from 0 here)
267 * @portstat: Returns port status
269 static int usb_hub_port_reset(struct usb_device *dev, int port,
270 unsigned short *portstat)
273 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
274 unsigned short portstatus, portchange;
275 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
277 #if CONFIG_IS_ENABLED(DM_USB)
278 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
281 debug("%s: resetting port %d...\n", __func__, port + 1);
283 for (tries = 0; tries < MAX_TRIES; tries++) {
284 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
290 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
291 debug("get_port_status failed status %lX\n",
295 portstatus = le16_to_cpu(portsts->wPortStatus);
296 portchange = le16_to_cpu(portsts->wPortChange);
298 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
299 portspeed(portstatus));
301 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
302 " USB_PORT_STAT_ENABLE %d\n",
303 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
304 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
305 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
308 * Perhaps we should check for the following here:
309 * - C_CONNECTION hasn't been set.
310 * - CONNECTION is still set.
312 * Doing so would ensure that the device is still connected
313 * to the bus, and hasn't been unplugged or replaced while the
314 * USB bus reset was going on.
316 * However, if we do that, then (at least) a San Disk Ultra
317 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
318 * Tegra Jetson TK1 board. For some reason, the device appears
319 * to briefly drop off the bus when this second bus reset is
320 * executed, yet if we retry this loop, it'll eventually come
321 * back after another reset or two.
324 if (portstatus & USB_PORT_STAT_ENABLE)
327 /* Switch to long reset delay for the next round */
328 delay = HUB_LONG_RESET_TIME;
331 if (tries == MAX_TRIES) {
332 debug("Cannot enable port %i after %i retries, " \
333 "disabling port.\n", port + 1, MAX_TRIES);
334 debug("Maybe the USB cable is bad?\n");
338 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
339 *portstat = portstatus;
343 int usb_hub_port_connect_change(struct usb_device *dev, int port)
345 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
346 unsigned short portstatus;
350 ret = usb_get_port_status(dev, port + 1, portsts);
352 debug("get_port_status failed\n");
356 portstatus = le16_to_cpu(portsts->wPortStatus);
357 debug("portstatus %x, change %x, %s\n",
359 le16_to_cpu(portsts->wPortChange),
360 portspeed(portstatus));
362 /* Clear the connection change status */
363 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
365 /* Disconnect any existing devices under this port */
366 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
367 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
368 usb_device_has_child_on_port(dev, port)) {
369 debug("usb_disconnect(&hub->children[port]);\n");
370 /* Return now if nothing is connected */
371 if (!(portstatus & USB_PORT_STAT_CONNECTION))
376 ret = usb_hub_port_reset(dev, port, &portstatus);
379 printf("cannot reset port %i!?\n", port + 1);
383 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
384 case USB_PORT_STAT_SUPER_SPEED:
385 speed = USB_SPEED_SUPER;
387 case USB_PORT_STAT_HIGH_SPEED:
388 speed = USB_SPEED_HIGH;
390 case USB_PORT_STAT_LOW_SPEED:
391 speed = USB_SPEED_LOW;
394 speed = USB_SPEED_FULL;
398 #if CONFIG_IS_ENABLED(DM_USB)
399 struct udevice *child;
401 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
403 struct usb_device *usb;
405 ret = usb_alloc_new_device(dev->controller, &usb);
407 printf("cannot create new device: ret=%d", ret);
411 dev->children[port] = usb;
414 usb->portnr = port + 1;
415 /* Run it through the hoops (find a driver, etc) */
416 ret = usb_new_device(usb);
418 /* Woops, disable the port */
419 usb_free_device(dev->controller);
420 dev->children[port] = NULL;
424 debug("hub: disabling port %d\n", port + 1);
425 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
431 static int usb_scan_port(struct usb_device_scan *usb_scan)
433 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
434 unsigned short portstatus;
435 unsigned short portchange;
436 struct usb_device *dev;
437 struct usb_hub_device *hub;
446 * Don't talk to the device before the query delay is expired.
447 * This is needed for voltages to stabalize.
449 if (get_timer(0) < hub->query_delay)
452 ret = usb_get_port_status(dev, i + 1, portsts);
454 debug("get_port_status failed\n");
455 if (get_timer(0) >= hub->connect_timeout) {
456 debug("devnum=%d port=%d: timeout\n",
458 /* Remove this device from scanning list */
459 list_del(&usb_scan->list);
466 portstatus = le16_to_cpu(portsts->wPortStatus);
467 portchange = le16_to_cpu(portsts->wPortChange);
468 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
471 * No connection change happened, wait a bit more.
473 * For some situation, the hub reports no connection change but a
474 * device is connected to the port (eg: CCS bit is set but CSC is not
475 * in the PORTSC register of a root hub), ignore such case.
477 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
478 !(portstatus & USB_PORT_STAT_CONNECTION)) {
479 if (get_timer(0) >= hub->connect_timeout) {
480 debug("devnum=%d port=%d: timeout\n",
482 /* Remove this device from scanning list */
483 list_del(&usb_scan->list);
490 if (portchange & USB_PORT_STAT_C_RESET) {
491 debug("port %d reset change\n", i + 1);
492 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
495 if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
496 usb_hub_is_superspeed(dev)) {
497 debug("port %d BH reset change\n", i + 1);
498 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
501 /* A new USB device is ready at this point */
502 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
504 usb_hub_port_connect_change(dev, i);
506 if (portchange & USB_PORT_STAT_C_ENABLE) {
507 debug("port %d enable change, status %x\n", i + 1, portstatus);
508 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
510 * The following hack causes a ghost device problem
513 #ifndef CONFIG_USB_EHCI_FARADAY
515 * EM interference sometimes causes bad shielded USB
516 * devices to be shutdown by the hub, this hack enables
517 * them again. Works at least with mouse driver
519 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
520 (portstatus & USB_PORT_STAT_CONNECTION) &&
521 usb_device_has_child_on_port(dev, i)) {
522 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
524 usb_hub_port_connect_change(dev, i);
529 if (portstatus & USB_PORT_STAT_SUSPEND) {
530 debug("port %d suspend change\n", i + 1);
531 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
534 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
535 debug("port %d over-current change\n", i + 1);
536 usb_clear_port_feature(dev, i + 1,
537 USB_PORT_FEAT_C_OVER_CURRENT);
538 /* Only power-on this one port */
539 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
540 hub->overcurrent_count[i]++;
543 * If the max-scan-count is not reached, return without removing
544 * the device from scan-list. This will re-issue a new scan.
546 if (hub->overcurrent_count[i] <=
547 PORT_OVERCURRENT_MAX_SCAN_COUNT)
550 /* Otherwise the device will get removed */
551 printf("Port %d over-current occurred %d times\n", i + 1,
552 hub->overcurrent_count[i]);
556 * We're done with this device, so let's remove this device from
559 list_del(&usb_scan->list);
565 static int usb_device_list_scan(void)
567 struct usb_device_scan *usb_scan;
568 struct usb_device_scan *tmp;
572 /* Only run this loop once for each controller */
579 /* We're done, once the list is empty again */
580 if (list_empty(&usb_scan_list))
583 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
587 ret = usb_scan_port(usb_scan);
595 * This USB controller has finished scanning all its connected
596 * USB devices. Set "running" back to 0, so that other USB controllers
597 * will scan their devices too.
604 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
606 struct usb_hub_device *hub;
608 #if !CONFIG_IS_ENABLED(DM_USB)
609 /* "allocate" Hub device */
610 hub = usb_hub_allocate();
612 hub = dev_get_uclass_priv(dev->dev);
618 static int usb_hub_configure(struct usb_device *dev)
621 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
622 unsigned char *bitmap;
623 short hubCharacteristics;
624 struct usb_hub_descriptor *descriptor;
625 struct usb_hub_device *hub;
626 struct usb_hub_status *hubsts;
629 hub = usb_get_hub_device(dev);
634 /* Get the the hub descriptor */
635 ret = usb_get_hub_descriptor(dev, buffer, 4);
637 debug("usb_hub_configure: failed to get hub " \
638 "descriptor, giving up %lX\n", dev->status);
641 descriptor = (struct usb_hub_descriptor *)buffer;
643 length = min_t(int, descriptor->bLength,
644 sizeof(struct usb_hub_descriptor));
646 ret = usb_get_hub_descriptor(dev, buffer, length);
648 debug("usb_hub_configure: failed to get hub " \
649 "descriptor 2nd giving up %lX\n", dev->status);
652 memcpy((unsigned char *)&hub->desc, buffer, length);
653 /* adjust 16bit values */
654 put_unaligned(le16_to_cpu(get_unaligned(
655 &descriptor->wHubCharacteristics)),
656 &hub->desc.wHubCharacteristics);
658 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
659 /* devices not removable by default */
660 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
661 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
662 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
664 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
665 hub->desc.u.hs.DeviceRemovable[i] =
666 descriptor->u.hs.DeviceRemovable[i];
668 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
669 hub->desc.u.hs.PortPowerCtrlMask[i] =
670 descriptor->u.hs.PortPowerCtrlMask[i];
672 dev->maxchild = descriptor->bNbrPorts;
673 debug("%d ports detected\n", dev->maxchild);
675 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
676 switch (hubCharacteristics & HUB_CHAR_LPSM) {
678 debug("ganged power switching\n");
681 debug("individual port power switching\n");
685 debug("unknown reserved power switching mode\n");
689 if (hubCharacteristics & HUB_CHAR_COMPOUND)
690 debug("part of a compound device\n");
692 debug("standalone hub\n");
694 switch (hubCharacteristics & HUB_CHAR_OCPM) {
696 debug("global over-current protection\n");
699 debug("individual port over-current protection\n");
703 debug("no over-current protection\n");
707 switch (dev->descriptor.bDeviceProtocol) {
710 case USB_HUB_PR_HS_SINGLE_TT:
711 debug("Single TT\n");
713 case USB_HUB_PR_HS_MULTI_TT:
714 ret = usb_set_interface(dev, 0, 1);
716 debug("TT per port\n");
717 hub->tt.multi = true;
719 debug("Using single TT (err %d)\n", ret);
723 /* USB 3.0 hubs don't have a TT */
726 debug("Unrecognized hub protocol %d\n",
727 dev->descriptor.bDeviceProtocol);
731 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
732 switch (hubCharacteristics & HUB_CHAR_TTTT) {
733 case HUB_TTTT_8_BITS:
734 if (dev->descriptor.bDeviceProtocol != 0) {
735 hub->tt.think_time = 666;
736 debug("TT requires at most %d FS bit times (%d ns)\n",
737 8, hub->tt.think_time);
740 case HUB_TTTT_16_BITS:
741 hub->tt.think_time = 666 * 2;
742 debug("TT requires at most %d FS bit times (%d ns)\n",
743 16, hub->tt.think_time);
745 case HUB_TTTT_24_BITS:
746 hub->tt.think_time = 666 * 3;
747 debug("TT requires at most %d FS bit times (%d ns)\n",
748 24, hub->tt.think_time);
750 case HUB_TTTT_32_BITS:
751 hub->tt.think_time = 666 * 4;
752 debug("TT requires at most %d FS bit times (%d ns)\n",
753 32, hub->tt.think_time);
757 debug("power on to power good time: %dms\n",
758 descriptor->bPwrOn2PwrGood * 2);
759 debug("hub controller current requirement: %dmA\n",
760 descriptor->bHubContrCurrent);
762 for (i = 0; i < dev->maxchild; i++)
763 debug("port %d is%s removable\n", i + 1,
764 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
765 (1 << ((i + 1) % 8)) ? " not" : "");
767 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
768 debug("usb_hub_configure: failed to get Status - " \
769 "too long: %d\n", descriptor->bLength);
773 ret = usb_get_hub_status(dev, buffer);
775 debug("usb_hub_configure: failed to get Status %lX\n",
780 hubsts = (struct usb_hub_status *)buffer;
782 debug("get_hub_status returned status %X, change %X\n",
783 le16_to_cpu(hubsts->wHubStatus),
784 le16_to_cpu(hubsts->wHubChange));
785 debug("local power source is %s\n",
786 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
787 "lost (inactive)" : "good");
788 debug("%sover-current condition exists\n",
789 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
792 #if CONFIG_IS_ENABLED(DM_USB)
794 * Update USB host controller's internal representation of this hub
795 * after the hub descriptor is fetched.
797 ret = usb_update_hub_device(dev);
798 if (ret < 0 && ret != -ENOSYS) {
799 debug("%s: failed to update hub device for HCD (%x)\n",
805 * A maximum of seven tiers are allowed in a USB topology, and the
806 * root hub occupies the first tier. The last tier ends with a normal
807 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
808 * to route packets to the designated downstream port. The hub uses a
809 * hub depth value multiplied by four as an offset into the 'route
810 * string' to locate the bits it uses to determine the downstream
813 if (usb_hub_is_root_hub(dev->dev)) {
816 struct udevice *hdev;
819 hdev = dev->dev->parent;
820 while (!usb_hub_is_root_hub(hdev)) {
825 hub->hub_depth = depth;
827 if (usb_hub_is_superspeed(dev)) {
828 debug("set hub (%p) depth to %d\n", dev, depth);
830 * This request sets the value that the hub uses to
831 * determine the index into the 'route string index'
834 ret = usb_set_hub_depth(dev, depth);
836 debug("%s: failed to set hub depth (%lX)\n",
837 __func__, dev->status);
844 usb_hub_power_on(hub);
847 * Reset any devices that may be in a bad state when applying
848 * the power. This is a __weak function. Resetting of the devices
849 * should occur in the board file of the device.
851 for (i = 0; i < dev->maxchild; i++)
852 usb_hub_reset_devices(hub, i + 1);
855 * Only add the connected USB devices, including potential hubs,
856 * to a scanning list. This list will get scanned and devices that
857 * are detected (either via port connected or via port timeout)
858 * will get removed from this list. Scanning of the devices on this
859 * list will continue until all devices are removed.
861 for (i = 0; i < dev->maxchild; i++) {
862 struct usb_device_scan *usb_scan;
864 usb_scan = calloc(1, sizeof(*usb_scan));
866 printf("Can't allocate memory for USB device!\n");
872 list_add_tail(&usb_scan->list, &usb_scan_list);
876 * And now call the scanning code which loops over the generated list
878 ret = usb_device_list_scan();
883 static int usb_hub_check(struct usb_device *dev, int ifnum)
885 struct usb_interface *iface;
886 struct usb_endpoint_descriptor *ep = NULL;
888 iface = &dev->config.if_desc[ifnum];
890 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
892 /* Some hubs have a subclass of 1, which AFAICT according to the */
893 /* specs is not defined, but it works */
894 if ((iface->desc.bInterfaceSubClass != 0) &&
895 (iface->desc.bInterfaceSubClass != 1))
897 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
898 if (iface->desc.bNumEndpoints != 1)
900 ep = &iface->ep_desc[0];
901 /* Output endpoint? Curiousier and curiousier.. */
902 if (!(ep->bEndpointAddress & USB_DIR_IN))
904 /* If it's not an interrupt endpoint, we'd better punt! */
905 if ((ep->bmAttributes & 3) != 3)
908 debug("USB hub found\n");
912 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
913 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
914 iface->desc.bNumEndpoints);
916 debug(" bEndpointAddress=%#x, bmAttributes=%d",
917 ep->bEndpointAddress, ep->bmAttributes);
923 int usb_hub_probe(struct usb_device *dev, int ifnum)
927 ret = usb_hub_check(dev, ifnum);
930 ret = usb_hub_configure(dev);
934 #if CONFIG_IS_ENABLED(DM_USB)
935 int usb_hub_scan(struct udevice *hub)
937 struct usb_device *udev = dev_get_parent_priv(hub);
939 return usb_hub_configure(udev);
942 static int usb_hub_post_probe(struct udevice *dev)
944 debug("%s\n", __func__);
945 return usb_hub_scan(dev);
948 static const struct udevice_id usb_hub_ids[] = {
949 { .compatible = "usb-hub" },
953 U_BOOT_DRIVER(usb_generic_hub) = {
955 .id = UCLASS_USB_HUB,
956 .of_match = usb_hub_ids,
957 .flags = DM_FLAG_ALLOC_PRIV_DMA,
960 UCLASS_DRIVER(usb_hub) = {
961 .id = UCLASS_USB_HUB,
963 .post_bind = dm_scan_fdt_dev,
964 .post_probe = usb_hub_post_probe,
965 .child_pre_probe = usb_child_pre_probe,
966 .per_child_auto = sizeof(struct usb_device),
967 .per_child_plat_auto = sizeof(struct usb_dev_plat),
968 .per_device_auto = sizeof(struct usb_hub_device),
971 static const struct usb_device_id hub_id_table[] = {
973 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
974 .bDeviceClass = USB_CLASS_HUB
976 { } /* Terminating entry */
979 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);