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
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>
42 #define USB_BUFSIZ 512
44 #define HUB_SHORT_RESET_TIME 20
45 #define HUB_LONG_RESET_TIME 200
47 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
49 struct usb_device_scan {
50 struct usb_device *dev; /* USB hub device to scan */
51 struct usb_hub_device *hub; /* USB hub struct */
52 int port; /* USB port to scan */
53 struct list_head list;
56 static LIST_HEAD(usb_scan_list);
58 __weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
63 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
65 return hdev->descriptor.bDeviceProtocol == 3;
68 #if CONFIG_IS_ENABLED(DM_USB)
69 bool usb_hub_is_root_hub(struct udevice *hub)
71 if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
77 static int usb_set_hub_depth(struct usb_device *dev, int depth)
79 if (depth < 0 || depth > 4)
82 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
83 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
84 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
88 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
90 unsigned short dtype = USB_DT_HUB;
92 if (usb_hub_is_superspeed(dev))
93 dtype = USB_DT_SS_HUB;
95 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
96 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
97 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
100 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
102 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
103 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
104 port, NULL, 0, USB_CNTL_TIMEOUT);
107 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
109 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
110 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
111 port, NULL, 0, USB_CNTL_TIMEOUT);
114 static int usb_get_hub_status(struct usb_device *dev, void *data)
116 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
117 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
118 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
121 int usb_get_port_status(struct usb_device *dev, int port, void *data)
125 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
126 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
127 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
129 #if CONFIG_IS_ENABLED(DM_USB)
134 * Translate the USB 3.0 hub port status field into the old version
135 * that U-Boot understands. Do this only when the hub is not root hub.
136 * For root hub, the port status field has already been translated
137 * in the host controller driver (see xhci_submit_root() in xhci.c).
139 * Note: this only supports driver model.
142 if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
143 struct usb_port_status *status = (struct usb_port_status *)data;
144 u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
146 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
147 tmp |= USB_PORT_STAT_POWER;
148 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
149 USB_SS_PORT_STAT_SPEED_5GBPS)
150 tmp |= USB_PORT_STAT_SUPER_SPEED;
152 status->wPortStatus = tmp;
160 static void usb_hub_power_on(struct usb_hub_device *hub)
163 struct usb_device *dev;
164 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
169 debug("enabling power on all ports\n");
170 for (i = 0; i < dev->maxchild; i++) {
171 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
172 debug("port %d returns %lX\n", i + 1, dev->status);
175 #ifdef CONFIG_SANDBOX
177 * Don't set timeout / delay values here. This results
178 * in these values still being reset to 0.
180 if (state_get_skip_delays())
185 * Wait for power to become stable,
186 * plus spec-defined max time for device to connect
187 * but allow this time to be increased via env variable as some
188 * devices break the spec and require longer warm-up times
190 env = env_get("usb_pgood_delay");
192 pgood_delay = max(pgood_delay,
193 (unsigned)simple_strtol(env, NULL, 0));
194 debug("pgood_delay=%dms\n", pgood_delay);
197 * Do a minimum delay of the larger value of 100ms or pgood_delay
198 * so that the power can stablize before the devices are queried
200 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
203 * Record the power-on timeout here. The max. delay (timeout)
204 * will be done based on this value in the USB port loop in
205 * usb_hub_configure() later.
207 hub->connect_timeout = hub->query_delay + 1000;
208 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
209 dev->devnum, max(100, (int)pgood_delay),
210 max(100, (int)pgood_delay) + 1000);
213 #if !CONFIG_IS_ENABLED(DM_USB)
214 static struct usb_hub_device hub_dev[USB_MAX_HUB];
215 static int usb_hub_index;
217 void usb_hub_reset(void)
221 /* Zero out global hub_dev in case its re-used again */
222 memset(hub_dev, 0, sizeof(hub_dev));
225 static struct usb_hub_device *usb_hub_allocate(void)
227 if (usb_hub_index < USB_MAX_HUB)
228 return &hub_dev[usb_hub_index++];
230 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
237 static inline const char *portspeed(int portstatus)
239 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
240 case USB_PORT_STAT_SUPER_SPEED:
242 case USB_PORT_STAT_HIGH_SPEED:
244 case USB_PORT_STAT_LOW_SPEED:
252 * usb_hub_port_reset() - reset a port given its usb_device pointer
254 * Reset a hub port and see if a device is present on that port, providing
255 * sufficient time for it to show itself. The port status is returned.
257 * @dev: USB device to reset
258 * @port: Port number to reset (note ports are numbered from 0 here)
259 * @portstat: Returns port status
261 static int usb_hub_port_reset(struct usb_device *dev, int port,
262 unsigned short *portstat)
265 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
266 unsigned short portstatus, portchange;
267 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
269 #if CONFIG_IS_ENABLED(DM_USB)
270 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
273 debug("%s: resetting port %d...\n", __func__, port + 1);
275 for (tries = 0; tries < MAX_TRIES; tries++) {
276 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
282 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
283 debug("get_port_status failed status %lX\n",
287 portstatus = le16_to_cpu(portsts->wPortStatus);
288 portchange = le16_to_cpu(portsts->wPortChange);
290 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
291 portspeed(portstatus));
293 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
294 " USB_PORT_STAT_ENABLE %d\n",
295 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
296 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
297 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
300 * Perhaps we should check for the following here:
301 * - C_CONNECTION hasn't been set.
302 * - CONNECTION is still set.
304 * Doing so would ensure that the device is still connected
305 * to the bus, and hasn't been unplugged or replaced while the
306 * USB bus reset was going on.
308 * However, if we do that, then (at least) a San Disk Ultra
309 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
310 * Tegra Jetson TK1 board. For some reason, the device appears
311 * to briefly drop off the bus when this second bus reset is
312 * executed, yet if we retry this loop, it'll eventually come
313 * back after another reset or two.
316 if (portstatus & USB_PORT_STAT_ENABLE)
319 /* Switch to long reset delay for the next round */
320 delay = HUB_LONG_RESET_TIME;
323 if (tries == MAX_TRIES) {
324 debug("Cannot enable port %i after %i retries, " \
325 "disabling port.\n", port + 1, MAX_TRIES);
326 debug("Maybe the USB cable is bad?\n");
330 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
331 *portstat = portstatus;
335 int usb_hub_port_connect_change(struct usb_device *dev, int port)
337 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
338 unsigned short portstatus;
342 ret = usb_get_port_status(dev, port + 1, portsts);
344 debug("get_port_status failed\n");
348 portstatus = le16_to_cpu(portsts->wPortStatus);
349 debug("portstatus %x, change %x, %s\n",
351 le16_to_cpu(portsts->wPortChange),
352 portspeed(portstatus));
354 /* Clear the connection change status */
355 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
357 /* Disconnect any existing devices under this port */
358 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
359 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
360 usb_device_has_child_on_port(dev, port)) {
361 debug("usb_disconnect(&hub->children[port]);\n");
362 /* Return now if nothing is connected */
363 if (!(portstatus & USB_PORT_STAT_CONNECTION))
368 ret = usb_hub_port_reset(dev, port, &portstatus);
371 printf("cannot reset port %i!?\n", port + 1);
375 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
376 case USB_PORT_STAT_SUPER_SPEED:
377 speed = USB_SPEED_SUPER;
379 case USB_PORT_STAT_HIGH_SPEED:
380 speed = USB_SPEED_HIGH;
382 case USB_PORT_STAT_LOW_SPEED:
383 speed = USB_SPEED_LOW;
386 speed = USB_SPEED_FULL;
390 #if CONFIG_IS_ENABLED(DM_USB)
391 struct udevice *child;
393 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
395 struct usb_device *usb;
397 ret = usb_alloc_new_device(dev->controller, &usb);
399 printf("cannot create new device: ret=%d", ret);
403 dev->children[port] = usb;
406 usb->portnr = port + 1;
407 /* Run it through the hoops (find a driver, etc) */
408 ret = usb_new_device(usb);
410 /* Woops, disable the port */
411 usb_free_device(dev->controller);
412 dev->children[port] = NULL;
416 debug("hub: disabling port %d\n", port + 1);
417 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
423 static int usb_scan_port(struct usb_device_scan *usb_scan)
425 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
426 unsigned short portstatus;
427 unsigned short portchange;
428 struct usb_device *dev;
429 struct usb_hub_device *hub;
438 * Don't talk to the device before the query delay is expired.
439 * This is needed for voltages to stabalize.
441 if (get_timer(0) < hub->query_delay)
444 ret = usb_get_port_status(dev, i + 1, portsts);
446 debug("get_port_status failed\n");
447 if (get_timer(0) >= hub->connect_timeout) {
448 debug("devnum=%d port=%d: timeout\n",
450 /* Remove this device from scanning list */
451 list_del(&usb_scan->list);
458 portstatus = le16_to_cpu(portsts->wPortStatus);
459 portchange = le16_to_cpu(portsts->wPortChange);
460 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
463 * No connection change happened, wait a bit more.
465 * For some situation, the hub reports no connection change but a
466 * device is connected to the port (eg: CCS bit is set but CSC is not
467 * in the PORTSC register of a root hub), ignore such case.
469 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
470 !(portstatus & USB_PORT_STAT_CONNECTION)) {
471 if (get_timer(0) >= hub->connect_timeout) {
472 debug("devnum=%d port=%d: timeout\n",
474 /* Remove this device from scanning list */
475 list_del(&usb_scan->list);
482 if (portchange & USB_PORT_STAT_C_RESET) {
483 debug("port %d reset change\n", i + 1);
484 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
487 if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
488 usb_hub_is_superspeed(dev)) {
489 debug("port %d BH reset change\n", i + 1);
490 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
493 /* A new USB device is ready at this point */
494 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
496 usb_hub_port_connect_change(dev, i);
498 if (portchange & USB_PORT_STAT_C_ENABLE) {
499 debug("port %d enable change, status %x\n", i + 1, portstatus);
500 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
502 * The following hack causes a ghost device problem
505 #ifndef CONFIG_USB_EHCI_FARADAY
507 * EM interference sometimes causes bad shielded USB
508 * devices to be shutdown by the hub, this hack enables
509 * them again. Works at least with mouse driver
511 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
512 (portstatus & USB_PORT_STAT_CONNECTION) &&
513 usb_device_has_child_on_port(dev, i)) {
514 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
516 usb_hub_port_connect_change(dev, i);
521 if (portstatus & USB_PORT_STAT_SUSPEND) {
522 debug("port %d suspend change\n", i + 1);
523 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
526 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
527 debug("port %d over-current change\n", i + 1);
528 usb_clear_port_feature(dev, i + 1,
529 USB_PORT_FEAT_C_OVER_CURRENT);
530 /* Only power-on this one port */
531 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
532 hub->overcurrent_count[i]++;
535 * If the max-scan-count is not reached, return without removing
536 * the device from scan-list. This will re-issue a new scan.
538 if (hub->overcurrent_count[i] <=
539 PORT_OVERCURRENT_MAX_SCAN_COUNT)
542 /* Otherwise the device will get removed */
543 printf("Port %d over-current occurred %d times\n", i + 1,
544 hub->overcurrent_count[i]);
548 * We're done with this device, so let's remove this device from
551 list_del(&usb_scan->list);
557 static int usb_device_list_scan(void)
559 struct usb_device_scan *usb_scan;
560 struct usb_device_scan *tmp;
564 /* Only run this loop once for each controller */
571 /* We're done, once the list is empty again */
572 if (list_empty(&usb_scan_list))
575 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
579 ret = usb_scan_port(usb_scan);
587 * This USB controller has finished scanning all its connected
588 * USB devices. Set "running" back to 0, so that other USB controllers
589 * will scan their devices too.
596 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
598 struct usb_hub_device *hub;
600 #if !CONFIG_IS_ENABLED(DM_USB)
601 /* "allocate" Hub device */
602 hub = usb_hub_allocate();
604 hub = dev_get_uclass_priv(dev->dev);
610 static int usb_hub_configure(struct usb_device *dev)
613 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
614 unsigned char *bitmap;
615 short hubCharacteristics;
616 struct usb_hub_descriptor *descriptor;
617 struct usb_hub_device *hub;
618 struct usb_hub_status *hubsts;
621 hub = usb_get_hub_device(dev);
626 /* Get the the hub descriptor */
627 ret = usb_get_hub_descriptor(dev, buffer, 4);
629 debug("usb_hub_configure: failed to get hub " \
630 "descriptor, giving up %lX\n", dev->status);
633 descriptor = (struct usb_hub_descriptor *)buffer;
635 length = min_t(int, descriptor->bLength,
636 sizeof(struct usb_hub_descriptor));
638 ret = usb_get_hub_descriptor(dev, buffer, length);
640 debug("usb_hub_configure: failed to get hub " \
641 "descriptor 2nd giving up %lX\n", dev->status);
644 memcpy((unsigned char *)&hub->desc, buffer, length);
645 /* adjust 16bit values */
646 put_unaligned(le16_to_cpu(get_unaligned(
647 &descriptor->wHubCharacteristics)),
648 &hub->desc.wHubCharacteristics);
650 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
651 /* devices not removable by default */
652 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
653 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
654 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
656 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
657 hub->desc.u.hs.DeviceRemovable[i] =
658 descriptor->u.hs.DeviceRemovable[i];
660 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
661 hub->desc.u.hs.PortPowerCtrlMask[i] =
662 descriptor->u.hs.PortPowerCtrlMask[i];
664 dev->maxchild = descriptor->bNbrPorts;
665 debug("%d ports detected\n", dev->maxchild);
667 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
668 switch (hubCharacteristics & HUB_CHAR_LPSM) {
670 debug("ganged power switching\n");
673 debug("individual port power switching\n");
677 debug("unknown reserved power switching mode\n");
681 if (hubCharacteristics & HUB_CHAR_COMPOUND)
682 debug("part of a compound device\n");
684 debug("standalone hub\n");
686 switch (hubCharacteristics & HUB_CHAR_OCPM) {
688 debug("global over-current protection\n");
691 debug("individual port over-current protection\n");
695 debug("no over-current protection\n");
699 switch (dev->descriptor.bDeviceProtocol) {
702 case USB_HUB_PR_HS_SINGLE_TT:
703 debug("Single TT\n");
705 case USB_HUB_PR_HS_MULTI_TT:
706 ret = usb_set_interface(dev, 0, 1);
708 debug("TT per port\n");
709 hub->tt.multi = true;
711 debug("Using single TT (err %d)\n", ret);
715 /* USB 3.0 hubs don't have a TT */
718 debug("Unrecognized hub protocol %d\n",
719 dev->descriptor.bDeviceProtocol);
723 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
724 switch (hubCharacteristics & HUB_CHAR_TTTT) {
725 case HUB_TTTT_8_BITS:
726 if (dev->descriptor.bDeviceProtocol != 0) {
727 hub->tt.think_time = 666;
728 debug("TT requires at most %d FS bit times (%d ns)\n",
729 8, hub->tt.think_time);
732 case HUB_TTTT_16_BITS:
733 hub->tt.think_time = 666 * 2;
734 debug("TT requires at most %d FS bit times (%d ns)\n",
735 16, hub->tt.think_time);
737 case HUB_TTTT_24_BITS:
738 hub->tt.think_time = 666 * 3;
739 debug("TT requires at most %d FS bit times (%d ns)\n",
740 24, hub->tt.think_time);
742 case HUB_TTTT_32_BITS:
743 hub->tt.think_time = 666 * 4;
744 debug("TT requires at most %d FS bit times (%d ns)\n",
745 32, hub->tt.think_time);
749 debug("power on to power good time: %dms\n",
750 descriptor->bPwrOn2PwrGood * 2);
751 debug("hub controller current requirement: %dmA\n",
752 descriptor->bHubContrCurrent);
754 for (i = 0; i < dev->maxchild; i++)
755 debug("port %d is%s removable\n", i + 1,
756 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
757 (1 << ((i + 1) % 8)) ? " not" : "");
759 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
760 debug("usb_hub_configure: failed to get Status - " \
761 "too long: %d\n", descriptor->bLength);
765 ret = usb_get_hub_status(dev, buffer);
767 debug("usb_hub_configure: failed to get Status %lX\n",
772 hubsts = (struct usb_hub_status *)buffer;
774 debug("get_hub_status returned status %X, change %X\n",
775 le16_to_cpu(hubsts->wHubStatus),
776 le16_to_cpu(hubsts->wHubChange));
777 debug("local power source is %s\n",
778 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
779 "lost (inactive)" : "good");
780 debug("%sover-current condition exists\n",
781 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
784 #if CONFIG_IS_ENABLED(DM_USB)
786 * Update USB host controller's internal representation of this hub
787 * after the hub descriptor is fetched.
789 ret = usb_update_hub_device(dev);
790 if (ret < 0 && ret != -ENOSYS) {
791 debug("%s: failed to update hub device for HCD (%x)\n",
797 * A maximum of seven tiers are allowed in a USB topology, and the
798 * root hub occupies the first tier. The last tier ends with a normal
799 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
800 * to route packets to the designated downstream port. The hub uses a
801 * hub depth value multiplied by four as an offset into the 'route
802 * string' to locate the bits it uses to determine the downstream
805 if (usb_hub_is_root_hub(dev->dev)) {
808 struct udevice *hdev;
811 hdev = dev->dev->parent;
812 while (!usb_hub_is_root_hub(hdev)) {
817 hub->hub_depth = depth;
819 if (usb_hub_is_superspeed(dev)) {
820 debug("set hub (%p) depth to %d\n", dev, depth);
822 * This request sets the value that the hub uses to
823 * determine the index into the 'route string index'
826 ret = usb_set_hub_depth(dev, depth);
828 debug("%s: failed to set hub depth (%lX)\n",
829 __func__, dev->status);
836 usb_hub_power_on(hub);
839 * Reset any devices that may be in a bad state when applying
840 * the power. This is a __weak function. Resetting of the devices
841 * should occur in the board file of the device.
843 for (i = 0; i < dev->maxchild; i++)
844 usb_hub_reset_devices(hub, i + 1);
847 * Only add the connected USB devices, including potential hubs,
848 * to a scanning list. This list will get scanned and devices that
849 * are detected (either via port connected or via port timeout)
850 * will get removed from this list. Scanning of the devices on this
851 * list will continue until all devices are removed.
853 for (i = 0; i < dev->maxchild; i++) {
854 struct usb_device_scan *usb_scan;
856 usb_scan = calloc(1, sizeof(*usb_scan));
858 printf("Can't allocate memory for USB device!\n");
864 list_add_tail(&usb_scan->list, &usb_scan_list);
868 * And now call the scanning code which loops over the generated list
870 ret = usb_device_list_scan();
875 static int usb_hub_check(struct usb_device *dev, int ifnum)
877 struct usb_interface *iface;
878 struct usb_endpoint_descriptor *ep = NULL;
880 iface = &dev->config.if_desc[ifnum];
882 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
884 /* Some hubs have a subclass of 1, which AFAICT according to the */
885 /* specs is not defined, but it works */
886 if ((iface->desc.bInterfaceSubClass != 0) &&
887 (iface->desc.bInterfaceSubClass != 1))
889 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
890 if (iface->desc.bNumEndpoints != 1)
892 ep = &iface->ep_desc[0];
893 /* Output endpoint? Curiousier and curiousier.. */
894 if (!(ep->bEndpointAddress & USB_DIR_IN))
896 /* If it's not an interrupt endpoint, we'd better punt! */
897 if ((ep->bmAttributes & 3) != 3)
900 debug("USB hub found\n");
904 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
905 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
906 iface->desc.bNumEndpoints);
908 debug(" bEndpointAddress=%#x, bmAttributes=%d",
909 ep->bEndpointAddress, ep->bmAttributes);
915 int usb_hub_probe(struct usb_device *dev, int ifnum)
919 ret = usb_hub_check(dev, ifnum);
922 ret = usb_hub_configure(dev);
926 #if CONFIG_IS_ENABLED(DM_USB)
927 int usb_hub_scan(struct udevice *hub)
929 struct usb_device *udev = dev_get_parent_priv(hub);
931 return usb_hub_configure(udev);
934 static int usb_hub_post_probe(struct udevice *dev)
936 debug("%s\n", __func__);
937 return usb_hub_scan(dev);
940 static const struct udevice_id usb_hub_ids[] = {
941 { .compatible = "usb-hub" },
945 U_BOOT_DRIVER(usb_generic_hub) = {
947 .id = UCLASS_USB_HUB,
948 .of_match = usb_hub_ids,
949 .flags = DM_FLAG_ALLOC_PRIV_DMA,
952 UCLASS_DRIVER(usb_hub) = {
953 .id = UCLASS_USB_HUB,
955 .post_bind = dm_scan_fdt_dev,
956 .post_probe = usb_hub_post_probe,
957 .child_pre_probe = usb_child_pre_probe,
958 .per_child_auto_alloc_size = sizeof(struct usb_device),
959 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
960 .per_device_auto_alloc_size = sizeof(struct usb_hub_device),
963 static const struct usb_device_id hub_id_table[] = {
965 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
966 .bDeviceClass = USB_CLASS_HUB
968 { } /* Terminating entry */
971 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);