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 CONFIG_USB_HUB_DEBOUNCE_TIMEOUT
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);
165 static void usb_hub_power_on(struct usb_hub_device *hub)
168 struct usb_device *dev;
169 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
170 const char __maybe_unused *env;
174 debug("enabling power on all ports\n");
175 for (i = 0; i < dev->maxchild; i++) {
176 if (usb_hub_is_superspeed(dev)) {
177 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_RESET);
178 debug("Reset : port %d returns %lX\n", i + 1, dev->status);
180 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
181 debug("PowerOn : port %d returns %lX\n", i + 1, dev->status);
184 #ifdef CONFIG_SANDBOX
186 * Don't set timeout / delay values here. This results
187 * in these values still being reset to 0.
189 if (state_get_skip_delays())
194 * Wait for power to become stable,
195 * plus spec-defined max time for device to connect
196 * but allow this time to be increased via env variable as some
197 * devices break the spec and require longer warm-up times
199 #if CONFIG_IS_ENABLED(ENV_SUPPORT)
200 env = env_get("usb_pgood_delay");
202 pgood_delay = max(pgood_delay,
203 (unsigned)simple_strtol(env, NULL, 0));
205 debug("pgood_delay=%dms\n", pgood_delay);
208 * Do a minimum delay of the larger value of 100ms or pgood_delay
209 * so that the power can stablize before the devices are queried
211 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
214 * Record the power-on timeout here. The max. delay (timeout)
215 * will be done based on this value in the USB port loop in
216 * usb_hub_configure() later.
218 hub->connect_timeout = hub->query_delay + HUB_DEBOUNCE_TIMEOUT;
219 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
220 dev->devnum, max(100, (int)pgood_delay),
221 max(100, (int)pgood_delay) + HUB_DEBOUNCE_TIMEOUT);
224 #if !CONFIG_IS_ENABLED(DM_USB)
225 static struct usb_hub_device hub_dev[USB_MAX_HUB];
226 static int usb_hub_index;
228 void usb_hub_reset(void)
232 /* Zero out global hub_dev in case its re-used again */
233 memset(hub_dev, 0, sizeof(hub_dev));
236 static struct usb_hub_device *usb_hub_allocate(void)
238 if (usb_hub_index < USB_MAX_HUB)
239 return &hub_dev[usb_hub_index++];
241 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
248 static inline const char *portspeed(int portstatus)
250 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
251 case USB_PORT_STAT_SUPER_SPEED:
253 case USB_PORT_STAT_HIGH_SPEED:
255 case USB_PORT_STAT_LOW_SPEED:
263 * usb_hub_port_reset() - reset a port given its usb_device pointer
265 * Reset a hub port and see if a device is present on that port, providing
266 * sufficient time for it to show itself. The port status is returned.
268 * @dev: USB device to reset
269 * @port: Port number to reset (note ports are numbered from 0 here)
270 * @portstat: Returns port status
272 static int usb_hub_port_reset(struct usb_device *dev, int port,
273 unsigned short *portstat)
276 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
277 unsigned short portstatus, portchange;
278 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
280 #if CONFIG_IS_ENABLED(DM_USB)
281 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
284 debug("%s: resetting port %d...\n", __func__, port + 1);
286 for (tries = 0; tries < MAX_TRIES; tries++) {
287 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
293 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
294 debug("get_port_status failed status %lX\n",
298 portstatus = le16_to_cpu(portsts->wPortStatus);
299 portchange = le16_to_cpu(portsts->wPortChange);
301 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
302 portspeed(portstatus));
304 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
305 " USB_PORT_STAT_ENABLE %d\n",
306 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
307 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
308 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
311 * Perhaps we should check for the following here:
312 * - C_CONNECTION hasn't been set.
313 * - CONNECTION is still set.
315 * Doing so would ensure that the device is still connected
316 * to the bus, and hasn't been unplugged or replaced while the
317 * USB bus reset was going on.
319 * However, if we do that, then (at least) a San Disk Ultra
320 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
321 * Tegra Jetson TK1 board. For some reason, the device appears
322 * to briefly drop off the bus when this second bus reset is
323 * executed, yet if we retry this loop, it'll eventually come
324 * back after another reset or two.
327 if (portstatus & USB_PORT_STAT_ENABLE)
330 /* Switch to long reset delay for the next round */
331 delay = HUB_LONG_RESET_TIME;
334 if (tries == MAX_TRIES) {
335 debug("Cannot enable port %i after %i retries, " \
336 "disabling port.\n", port + 1, MAX_TRIES);
337 debug("Maybe the USB cable is bad?\n");
341 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
342 *portstat = portstatus;
346 int usb_hub_port_connect_change(struct usb_device *dev, int port)
348 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
349 unsigned short portstatus;
353 ret = usb_get_port_status(dev, port + 1, portsts);
355 debug("get_port_status failed\n");
359 portstatus = le16_to_cpu(portsts->wPortStatus);
360 debug("portstatus %x, change %x, %s\n",
362 le16_to_cpu(portsts->wPortChange),
363 portspeed(portstatus));
365 /* Clear the connection change status */
366 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
368 /* Disconnect any existing devices under this port */
369 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
370 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
371 usb_device_has_child_on_port(dev, port)) {
372 debug("usb_disconnect(&hub->children[port]);\n");
373 /* Return now if nothing is connected */
374 if (!(portstatus & USB_PORT_STAT_CONNECTION))
379 ret = usb_hub_port_reset(dev, port, &portstatus);
382 printf("cannot reset port %i!?\n", port + 1);
386 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
387 case USB_PORT_STAT_SUPER_SPEED:
388 speed = USB_SPEED_SUPER;
390 case USB_PORT_STAT_HIGH_SPEED:
391 speed = USB_SPEED_HIGH;
393 case USB_PORT_STAT_LOW_SPEED:
394 speed = USB_SPEED_LOW;
397 speed = USB_SPEED_FULL;
402 * USB 2.0 7.1.7.5: devices must be able to accept a SetAddress()
403 * request (refer to Section 11.24.2 and Section 9.4 respectively)
404 * after the reset recovery time 10 ms
408 #if CONFIG_IS_ENABLED(DM_USB)
409 struct udevice *child;
411 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
413 struct usb_device *usb;
415 ret = usb_alloc_new_device(dev->controller, &usb);
417 printf("cannot create new device: ret=%d", ret);
421 dev->children[port] = usb;
424 usb->portnr = port + 1;
425 /* Run it through the hoops (find a driver, etc) */
426 ret = usb_new_device(usb);
428 /* Woops, disable the port */
429 usb_free_device(dev->controller);
430 dev->children[port] = NULL;
434 debug("hub: disabling port %d\n", port + 1);
435 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
441 static int usb_scan_port(struct usb_device_scan *usb_scan)
443 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
444 unsigned short portstatus;
445 unsigned short portchange;
446 struct usb_device *dev;
447 struct usb_hub_device *hub;
456 * Don't talk to the device before the query delay is expired.
457 * This is needed for voltages to stabalize.
459 if (get_timer(0) < hub->query_delay)
462 ret = usb_get_port_status(dev, i + 1, portsts);
464 debug("get_port_status failed\n");
465 if (get_timer(0) >= hub->connect_timeout) {
466 debug("devnum=%d port=%d: timeout\n",
468 /* Remove this device from scanning list */
469 list_del(&usb_scan->list);
476 portstatus = le16_to_cpu(portsts->wPortStatus);
477 portchange = le16_to_cpu(portsts->wPortChange);
478 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
481 * No connection change happened, wait a bit more.
483 * For some situation, the hub reports no connection change but a
484 * device is connected to the port (eg: CCS bit is set but CSC is not
485 * in the PORTSC register of a root hub), ignore such case.
487 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
488 !(portstatus & USB_PORT_STAT_CONNECTION)) {
489 if (get_timer(0) >= hub->connect_timeout) {
490 debug("devnum=%d port=%d: timeout\n",
492 /* Remove this device from scanning list */
493 list_del(&usb_scan->list);
500 if (portchange & USB_PORT_STAT_C_RESET) {
501 debug("port %d reset change\n", i + 1);
502 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
505 if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
506 usb_hub_is_superspeed(dev)) {
507 debug("port %d BH reset change\n", i + 1);
508 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
511 /* A new USB device is ready at this point */
512 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
514 usb_hub_port_connect_change(dev, i);
516 if (portchange & USB_PORT_STAT_C_ENABLE) {
517 debug("port %d enable change, status %x\n", i + 1, portstatus);
518 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
520 * EM interference sometimes causes bad shielded USB
521 * devices to be shutdown by the hub, this hack enables
522 * them again. Works at least with mouse driver
524 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
525 (portstatus & USB_PORT_STAT_CONNECTION) &&
526 usb_device_has_child_on_port(dev, i)) {
527 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
529 usb_hub_port_connect_change(dev, i);
533 if (portstatus & USB_PORT_STAT_SUSPEND) {
534 debug("port %d suspend change\n", i + 1);
535 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
538 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
539 debug("port %d over-current change\n", i + 1);
540 usb_clear_port_feature(dev, i + 1,
541 USB_PORT_FEAT_C_OVER_CURRENT);
542 /* Only power-on this one port */
543 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
544 hub->overcurrent_count[i]++;
547 * If the max-scan-count is not reached, return without removing
548 * the device from scan-list. This will re-issue a new scan.
550 if (hub->overcurrent_count[i] <=
551 PORT_OVERCURRENT_MAX_SCAN_COUNT)
554 /* Otherwise the device will get removed */
555 printf("Port %d over-current occurred %d times\n", i + 1,
556 hub->overcurrent_count[i]);
560 * We're done with this device, so let's remove this device from
563 list_del(&usb_scan->list);
569 static int usb_device_list_scan(void)
571 struct usb_device_scan *usb_scan;
572 struct usb_device_scan *tmp;
576 /* Only run this loop once for each controller */
583 /* We're done, once the list is empty again */
584 if (list_empty(&usb_scan_list))
587 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
591 ret = usb_scan_port(usb_scan);
599 * This USB controller has finished scanning all its connected
600 * USB devices. Set "running" back to 0, so that other USB controllers
601 * will scan their devices too.
608 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
610 struct usb_hub_device *hub;
612 #if !CONFIG_IS_ENABLED(DM_USB)
613 /* "allocate" Hub device */
614 hub = usb_hub_allocate();
616 hub = dev_get_uclass_priv(dev->dev);
622 static int usb_hub_configure(struct usb_device *dev)
625 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
626 unsigned char *bitmap;
627 short hubCharacteristics;
628 struct usb_hub_descriptor *descriptor;
629 struct usb_hub_device *hub;
630 struct usb_hub_status *hubsts;
633 hub = usb_get_hub_device(dev);
638 /* Get the the hub descriptor */
639 ret = usb_get_hub_descriptor(dev, buffer, 4);
641 debug("usb_hub_configure: failed to get hub " \
642 "descriptor, giving up %lX\n", dev->status);
645 descriptor = (struct usb_hub_descriptor *)buffer;
647 length = min_t(int, descriptor->bLength,
648 sizeof(struct usb_hub_descriptor));
650 ret = usb_get_hub_descriptor(dev, buffer, length);
652 debug("usb_hub_configure: failed to get hub " \
653 "descriptor 2nd giving up %lX\n", dev->status);
656 memcpy((unsigned char *)&hub->desc, buffer, length);
657 /* adjust 16bit values */
658 put_unaligned(le16_to_cpu(get_unaligned(
659 &descriptor->wHubCharacteristics)),
660 &hub->desc.wHubCharacteristics);
662 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
663 /* devices not removable by default */
664 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
665 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
666 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
668 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
669 hub->desc.u.hs.DeviceRemovable[i] =
670 descriptor->u.hs.DeviceRemovable[i];
672 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
673 hub->desc.u.hs.PortPowerCtrlMask[i] =
674 descriptor->u.hs.PortPowerCtrlMask[i];
676 dev->maxchild = descriptor->bNbrPorts;
677 debug("%d ports detected\n", dev->maxchild);
679 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
680 switch (hubCharacteristics & HUB_CHAR_LPSM) {
682 debug("ganged power switching\n");
685 debug("individual port power switching\n");
689 debug("unknown reserved power switching mode\n");
693 if (hubCharacteristics & HUB_CHAR_COMPOUND)
694 debug("part of a compound device\n");
696 debug("standalone hub\n");
698 switch (hubCharacteristics & HUB_CHAR_OCPM) {
700 debug("global over-current protection\n");
703 debug("individual port over-current protection\n");
707 debug("no over-current protection\n");
711 switch (dev->descriptor.bDeviceProtocol) {
714 case USB_HUB_PR_HS_SINGLE_TT:
715 debug("Single TT\n");
717 case USB_HUB_PR_HS_MULTI_TT:
718 ret = usb_set_interface(dev, 0, 1);
720 debug("TT per port\n");
721 hub->tt.multi = true;
723 debug("Using single TT (err %d)\n", ret);
727 /* USB 3.0 hubs don't have a TT */
730 debug("Unrecognized hub protocol %d\n",
731 dev->descriptor.bDeviceProtocol);
735 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
736 switch (hubCharacteristics & HUB_CHAR_TTTT) {
737 case HUB_TTTT_8_BITS:
738 if (dev->descriptor.bDeviceProtocol != 0) {
739 hub->tt.think_time = 666;
740 debug("TT requires at most %d FS bit times (%d ns)\n",
741 8, hub->tt.think_time);
744 case HUB_TTTT_16_BITS:
745 hub->tt.think_time = 666 * 2;
746 debug("TT requires at most %d FS bit times (%d ns)\n",
747 16, hub->tt.think_time);
749 case HUB_TTTT_24_BITS:
750 hub->tt.think_time = 666 * 3;
751 debug("TT requires at most %d FS bit times (%d ns)\n",
752 24, hub->tt.think_time);
754 case HUB_TTTT_32_BITS:
755 hub->tt.think_time = 666 * 4;
756 debug("TT requires at most %d FS bit times (%d ns)\n",
757 32, hub->tt.think_time);
761 debug("power on to power good time: %dms\n",
762 descriptor->bPwrOn2PwrGood * 2);
763 debug("hub controller current requirement: %dmA\n",
764 descriptor->bHubContrCurrent);
766 for (i = 0; i < dev->maxchild; i++)
767 debug("port %d is%s removable\n", i + 1,
768 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
769 (1 << ((i + 1) % 8)) ? " not" : "");
771 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
772 debug("usb_hub_configure: failed to get Status - " \
773 "too long: %d\n", descriptor->bLength);
777 ret = usb_get_hub_status(dev, buffer);
779 debug("usb_hub_configure: failed to get Status %lX\n",
784 hubsts = (struct usb_hub_status *)buffer;
786 debug("get_hub_status returned status %X, change %X\n",
787 le16_to_cpu(hubsts->wHubStatus),
788 le16_to_cpu(hubsts->wHubChange));
789 debug("local power source is %s\n",
790 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
791 "lost (inactive)" : "good");
792 debug("%sover-current condition exists\n",
793 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
796 #if CONFIG_IS_ENABLED(DM_USB)
798 * Update USB host controller's internal representation of this hub
799 * after the hub descriptor is fetched.
801 ret = usb_update_hub_device(dev);
802 if (ret < 0 && ret != -ENOSYS) {
803 debug("%s: failed to update hub device for HCD (%x)\n",
809 * A maximum of seven tiers are allowed in a USB topology, and the
810 * root hub occupies the first tier. The last tier ends with a normal
811 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
812 * to route packets to the designated downstream port. The hub uses a
813 * hub depth value multiplied by four as an offset into the 'route
814 * string' to locate the bits it uses to determine the downstream
817 if (usb_hub_is_root_hub(dev->dev)) {
820 struct udevice *hdev;
823 hdev = dev->dev->parent;
824 while (!usb_hub_is_root_hub(hdev)) {
829 hub->hub_depth = depth;
831 if (usb_hub_is_superspeed(dev)) {
832 debug("set hub (%p) depth to %d\n", dev, depth);
834 * This request sets the value that the hub uses to
835 * determine the index into the 'route string index'
838 ret = usb_set_hub_depth(dev, depth);
840 debug("%s: failed to set hub depth (%lX)\n",
841 __func__, dev->status);
848 usb_hub_power_on(hub);
851 * Reset any devices that may be in a bad state when applying
852 * the power. This is a __weak function. Resetting of the devices
853 * should occur in the board file of the device.
855 for (i = 0; i < dev->maxchild; i++)
856 usb_hub_reset_devices(hub, i + 1);
859 * Only add the connected USB devices, including potential hubs,
860 * to a scanning list. This list will get scanned and devices that
861 * are detected (either via port connected or via port timeout)
862 * will get removed from this list. Scanning of the devices on this
863 * list will continue until all devices are removed.
865 for (i = 0; i < dev->maxchild; i++) {
866 struct usb_device_scan *usb_scan;
868 usb_scan = calloc(1, sizeof(*usb_scan));
870 printf("Can't allocate memory for USB device!\n");
876 list_add_tail(&usb_scan->list, &usb_scan_list);
880 * And now call the scanning code which loops over the generated list
882 ret = usb_device_list_scan();
887 static int usb_hub_check(struct usb_device *dev, int ifnum)
889 struct usb_interface *iface;
890 struct usb_endpoint_descriptor *ep = NULL;
892 iface = &dev->config.if_desc[ifnum];
894 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
896 /* Some hubs have a subclass of 1, which AFAICT according to the */
897 /* specs is not defined, but it works */
898 if ((iface->desc.bInterfaceSubClass != 0) &&
899 (iface->desc.bInterfaceSubClass != 1))
901 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
902 if (iface->desc.bNumEndpoints != 1)
904 ep = &iface->ep_desc[0];
905 /* Output endpoint? Curiousier and curiousier.. */
906 if (!(ep->bEndpointAddress & USB_DIR_IN))
908 /* If it's not an interrupt endpoint, we'd better punt! */
909 if ((ep->bmAttributes & 3) != 3)
912 debug("USB hub found\n");
916 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
917 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
918 iface->desc.bNumEndpoints);
920 debug(" bEndpointAddress=%#x, bmAttributes=%d",
921 ep->bEndpointAddress, ep->bmAttributes);
927 int usb_hub_probe(struct usb_device *dev, int ifnum)
931 ret = usb_hub_check(dev, ifnum);
934 ret = usb_hub_configure(dev);
938 #if CONFIG_IS_ENABLED(DM_USB)
939 int usb_hub_scan(struct udevice *hub)
941 struct usb_device *udev = dev_get_parent_priv(hub);
943 return usb_hub_configure(udev);
946 static int usb_hub_post_probe(struct udevice *dev)
948 debug("%s\n", __func__);
949 return usb_hub_scan(dev);
952 static const struct udevice_id usb_hub_ids[] = {
953 { .compatible = "usb-hub" },
957 U_BOOT_DRIVER(usb_generic_hub) = {
959 .id = UCLASS_USB_HUB,
960 .of_match = usb_hub_ids,
961 .flags = DM_FLAG_ALLOC_PRIV_DMA,
964 UCLASS_DRIVER(usb_hub) = {
965 .id = UCLASS_USB_HUB,
967 .post_bind = dm_scan_fdt_dev,
968 .post_probe = usb_hub_post_probe,
969 .child_pre_probe = usb_child_pre_probe,
970 .per_child_auto = sizeof(struct usb_device),
971 .per_child_plat_auto = sizeof(struct usb_dev_plat),
972 .per_device_auto = sizeof(struct usb_hub_device),
975 static const struct usb_device_id hub_id_table[] = {
977 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
978 .bDeviceClass = USB_CLASS_HUB
980 { } /* Terminating entry */
983 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);