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
31 #include <asm/processor.h>
32 #include <asm/unaligned.h>
33 #include <linux/ctype.h>
34 #include <linux/list.h>
35 #include <asm/byteorder.h>
37 #include <asm/state.h>
39 #include <asm/unaligned.h>
43 #define USB_BUFSIZ 512
45 #define HUB_SHORT_RESET_TIME 20
46 #define HUB_LONG_RESET_TIME 200
48 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
50 struct usb_device_scan {
51 struct usb_device *dev; /* USB hub device to scan */
52 struct usb_hub_device *hub; /* USB hub struct */
53 int port; /* USB port to scan */
54 struct list_head list;
57 static LIST_HEAD(usb_scan_list);
59 __weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
64 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
66 return hdev->descriptor.bDeviceProtocol == 3;
69 #if CONFIG_IS_ENABLED(DM_USB)
70 bool usb_hub_is_root_hub(struct udevice *hub)
72 if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
78 static int usb_set_hub_depth(struct usb_device *dev, int depth)
80 if (depth < 0 || depth > 4)
83 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
84 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
85 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
89 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
91 unsigned short dtype = USB_DT_HUB;
93 if (usb_hub_is_superspeed(dev))
94 dtype = USB_DT_SS_HUB;
96 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
97 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
98 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
101 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
103 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
104 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
105 port, NULL, 0, USB_CNTL_TIMEOUT);
108 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
110 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
111 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
112 port, NULL, 0, USB_CNTL_TIMEOUT);
115 static int usb_get_hub_status(struct usb_device *dev, void *data)
117 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
118 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
119 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
122 int usb_get_port_status(struct usb_device *dev, int port, void *data)
126 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
127 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
128 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
130 #if CONFIG_IS_ENABLED(DM_USB)
135 * Translate the USB 3.0 hub port status field into the old version
136 * that U-Boot understands. Do this only when the hub is not root hub.
137 * For root hub, the port status field has already been translated
138 * in the host controller driver (see xhci_submit_root() in xhci.c).
140 * Note: this only supports driver model.
143 if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
144 struct usb_port_status *status = (struct usb_port_status *)data;
145 u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
147 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
148 tmp |= USB_PORT_STAT_POWER;
149 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
150 USB_SS_PORT_STAT_SPEED_5GBPS)
151 tmp |= USB_PORT_STAT_SUPER_SPEED;
153 status->wPortStatus = tmp;
161 static void usb_hub_power_on(struct usb_hub_device *hub)
164 struct usb_device *dev;
165 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
170 debug("enabling power on all ports\n");
171 for (i = 0; i < dev->maxchild; i++) {
172 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
173 debug("port %d returns %lX\n", i + 1, dev->status);
176 #ifdef CONFIG_SANDBOX
178 * Don't set timeout / delay values here. This results
179 * in these values still being reset to 0.
181 if (state_get_skip_delays())
186 * Wait for power to become stable,
187 * plus spec-defined max time for device to connect
188 * but allow this time to be increased via env variable as some
189 * devices break the spec and require longer warm-up times
191 env = env_get("usb_pgood_delay");
193 pgood_delay = max(pgood_delay,
194 (unsigned)simple_strtol(env, NULL, 0));
195 debug("pgood_delay=%dms\n", pgood_delay);
198 * Do a minimum delay of the larger value of 100ms or pgood_delay
199 * so that the power can stablize before the devices are queried
201 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
204 * Record the power-on timeout here. The max. delay (timeout)
205 * will be done based on this value in the USB port loop in
206 * usb_hub_configure() later.
208 hub->connect_timeout = hub->query_delay + 1000;
209 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
210 dev->devnum, max(100, (int)pgood_delay),
211 max(100, (int)pgood_delay) + 1000);
214 #if !CONFIG_IS_ENABLED(DM_USB)
215 static struct usb_hub_device hub_dev[USB_MAX_HUB];
216 static int usb_hub_index;
218 void usb_hub_reset(void)
222 /* Zero out global hub_dev in case its re-used again */
223 memset(hub_dev, 0, sizeof(hub_dev));
226 static struct usb_hub_device *usb_hub_allocate(void)
228 if (usb_hub_index < USB_MAX_HUB)
229 return &hub_dev[usb_hub_index++];
231 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
238 static inline const char *portspeed(int portstatus)
240 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
241 case USB_PORT_STAT_SUPER_SPEED:
243 case USB_PORT_STAT_HIGH_SPEED:
245 case USB_PORT_STAT_LOW_SPEED:
253 * usb_hub_port_reset() - reset a port given its usb_device pointer
255 * Reset a hub port and see if a device is present on that port, providing
256 * sufficient time for it to show itself. The port status is returned.
258 * @dev: USB device to reset
259 * @port: Port number to reset (note ports are numbered from 0 here)
260 * @portstat: Returns port status
262 static int usb_hub_port_reset(struct usb_device *dev, int port,
263 unsigned short *portstat)
266 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
267 unsigned short portstatus, portchange;
268 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
270 #if CONFIG_IS_ENABLED(DM_USB)
271 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
274 debug("%s: resetting port %d...\n", __func__, port + 1);
276 for (tries = 0; tries < MAX_TRIES; tries++) {
277 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
283 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
284 debug("get_port_status failed status %lX\n",
288 portstatus = le16_to_cpu(portsts->wPortStatus);
289 portchange = le16_to_cpu(portsts->wPortChange);
291 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
292 portspeed(portstatus));
294 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
295 " USB_PORT_STAT_ENABLE %d\n",
296 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
297 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
298 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
301 * Perhaps we should check for the following here:
302 * - C_CONNECTION hasn't been set.
303 * - CONNECTION is still set.
305 * Doing so would ensure that the device is still connected
306 * to the bus, and hasn't been unplugged or replaced while the
307 * USB bus reset was going on.
309 * However, if we do that, then (at least) a San Disk Ultra
310 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
311 * Tegra Jetson TK1 board. For some reason, the device appears
312 * to briefly drop off the bus when this second bus reset is
313 * executed, yet if we retry this loop, it'll eventually come
314 * back after another reset or two.
317 if (portstatus & USB_PORT_STAT_ENABLE)
320 /* Switch to long reset delay for the next round */
321 delay = HUB_LONG_RESET_TIME;
324 if (tries == MAX_TRIES) {
325 debug("Cannot enable port %i after %i retries, " \
326 "disabling port.\n", port + 1, MAX_TRIES);
327 debug("Maybe the USB cable is bad?\n");
331 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
332 *portstat = portstatus;
336 int usb_hub_port_connect_change(struct usb_device *dev, int port)
338 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
339 unsigned short portstatus;
343 ret = usb_get_port_status(dev, port + 1, portsts);
345 debug("get_port_status failed\n");
349 portstatus = le16_to_cpu(portsts->wPortStatus);
350 debug("portstatus %x, change %x, %s\n",
352 le16_to_cpu(portsts->wPortChange),
353 portspeed(portstatus));
355 /* Clear the connection change status */
356 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
358 /* Disconnect any existing devices under this port */
359 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
360 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
361 usb_device_has_child_on_port(dev, port)) {
362 debug("usb_disconnect(&hub->children[port]);\n");
363 /* Return now if nothing is connected */
364 if (!(portstatus & USB_PORT_STAT_CONNECTION))
369 ret = usb_hub_port_reset(dev, port, &portstatus);
372 printf("cannot reset port %i!?\n", port + 1);
376 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
377 case USB_PORT_STAT_SUPER_SPEED:
378 speed = USB_SPEED_SUPER;
380 case USB_PORT_STAT_HIGH_SPEED:
381 speed = USB_SPEED_HIGH;
383 case USB_PORT_STAT_LOW_SPEED:
384 speed = USB_SPEED_LOW;
387 speed = USB_SPEED_FULL;
391 #if CONFIG_IS_ENABLED(DM_USB)
392 struct udevice *child;
394 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
396 struct usb_device *usb;
398 ret = usb_alloc_new_device(dev->controller, &usb);
400 printf("cannot create new device: ret=%d", ret);
404 dev->children[port] = usb;
407 usb->portnr = port + 1;
408 /* Run it through the hoops (find a driver, etc) */
409 ret = usb_new_device(usb);
411 /* Woops, disable the port */
412 usb_free_device(dev->controller);
413 dev->children[port] = NULL;
417 debug("hub: disabling port %d\n", port + 1);
418 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
424 static int usb_scan_port(struct usb_device_scan *usb_scan)
426 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
427 unsigned short portstatus;
428 unsigned short portchange;
429 struct usb_device *dev;
430 struct usb_hub_device *hub;
439 * Don't talk to the device before the query delay is expired.
440 * This is needed for voltages to stabalize.
442 if (get_timer(0) < hub->query_delay)
445 ret = usb_get_port_status(dev, i + 1, portsts);
447 debug("get_port_status failed\n");
448 if (get_timer(0) >= hub->connect_timeout) {
449 debug("devnum=%d port=%d: timeout\n",
451 /* Remove this device from scanning list */
452 list_del(&usb_scan->list);
459 portstatus = le16_to_cpu(portsts->wPortStatus);
460 portchange = le16_to_cpu(portsts->wPortChange);
461 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
464 * No connection change happened, wait a bit more.
466 * For some situation, the hub reports no connection change but a
467 * device is connected to the port (eg: CCS bit is set but CSC is not
468 * in the PORTSC register of a root hub), ignore such case.
470 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
471 !(portstatus & USB_PORT_STAT_CONNECTION)) {
472 if (get_timer(0) >= hub->connect_timeout) {
473 debug("devnum=%d port=%d: timeout\n",
475 /* Remove this device from scanning list */
476 list_del(&usb_scan->list);
483 if (portchange & USB_PORT_STAT_C_RESET) {
484 debug("port %d reset change\n", i + 1);
485 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
488 if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
489 usb_hub_is_superspeed(dev)) {
490 debug("port %d BH reset change\n", i + 1);
491 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
494 /* A new USB device is ready at this point */
495 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
497 usb_hub_port_connect_change(dev, i);
499 if (portchange & USB_PORT_STAT_C_ENABLE) {
500 debug("port %d enable change, status %x\n", i + 1, portstatus);
501 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
503 * The following hack causes a ghost device problem
506 #ifndef CONFIG_USB_EHCI_FARADAY
508 * EM interference sometimes causes bad shielded USB
509 * devices to be shutdown by the hub, this hack enables
510 * them again. Works at least with mouse driver
512 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
513 (portstatus & USB_PORT_STAT_CONNECTION) &&
514 usb_device_has_child_on_port(dev, i)) {
515 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
517 usb_hub_port_connect_change(dev, i);
522 if (portstatus & USB_PORT_STAT_SUSPEND) {
523 debug("port %d suspend change\n", i + 1);
524 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
527 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
528 debug("port %d over-current change\n", i + 1);
529 usb_clear_port_feature(dev, i + 1,
530 USB_PORT_FEAT_C_OVER_CURRENT);
531 /* Only power-on this one port */
532 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
533 hub->overcurrent_count[i]++;
536 * If the max-scan-count is not reached, return without removing
537 * the device from scan-list. This will re-issue a new scan.
539 if (hub->overcurrent_count[i] <=
540 PORT_OVERCURRENT_MAX_SCAN_COUNT)
543 /* Otherwise the device will get removed */
544 printf("Port %d over-current occurred %d times\n", i + 1,
545 hub->overcurrent_count[i]);
549 * We're done with this device, so let's remove this device from
552 list_del(&usb_scan->list);
558 static int usb_device_list_scan(void)
560 struct usb_device_scan *usb_scan;
561 struct usb_device_scan *tmp;
565 /* Only run this loop once for each controller */
572 /* We're done, once the list is empty again */
573 if (list_empty(&usb_scan_list))
576 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
580 ret = usb_scan_port(usb_scan);
588 * This USB controller has finished scanning all its connected
589 * USB devices. Set "running" back to 0, so that other USB controllers
590 * will scan their devices too.
597 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
599 struct usb_hub_device *hub;
601 #if !CONFIG_IS_ENABLED(DM_USB)
602 /* "allocate" Hub device */
603 hub = usb_hub_allocate();
605 hub = dev_get_uclass_priv(dev->dev);
611 static int usb_hub_configure(struct usb_device *dev)
614 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
615 unsigned char *bitmap;
616 short hubCharacteristics;
617 struct usb_hub_descriptor *descriptor;
618 struct usb_hub_device *hub;
619 struct usb_hub_status *hubsts;
622 hub = usb_get_hub_device(dev);
627 /* Get the the hub descriptor */
628 ret = usb_get_hub_descriptor(dev, buffer, 4);
630 debug("usb_hub_configure: failed to get hub " \
631 "descriptor, giving up %lX\n", dev->status);
634 descriptor = (struct usb_hub_descriptor *)buffer;
636 length = min_t(int, descriptor->bLength,
637 sizeof(struct usb_hub_descriptor));
639 ret = usb_get_hub_descriptor(dev, buffer, length);
641 debug("usb_hub_configure: failed to get hub " \
642 "descriptor 2nd giving up %lX\n", dev->status);
645 memcpy((unsigned char *)&hub->desc, buffer, length);
646 /* adjust 16bit values */
647 put_unaligned(le16_to_cpu(get_unaligned(
648 &descriptor->wHubCharacteristics)),
649 &hub->desc.wHubCharacteristics);
651 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
652 /* devices not removable by default */
653 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
654 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
655 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
657 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
658 hub->desc.u.hs.DeviceRemovable[i] =
659 descriptor->u.hs.DeviceRemovable[i];
661 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
662 hub->desc.u.hs.PortPowerCtrlMask[i] =
663 descriptor->u.hs.PortPowerCtrlMask[i];
665 dev->maxchild = descriptor->bNbrPorts;
666 debug("%d ports detected\n", dev->maxchild);
668 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
669 switch (hubCharacteristics & HUB_CHAR_LPSM) {
671 debug("ganged power switching\n");
674 debug("individual port power switching\n");
678 debug("unknown reserved power switching mode\n");
682 if (hubCharacteristics & HUB_CHAR_COMPOUND)
683 debug("part of a compound device\n");
685 debug("standalone hub\n");
687 switch (hubCharacteristics & HUB_CHAR_OCPM) {
689 debug("global over-current protection\n");
692 debug("individual port over-current protection\n");
696 debug("no over-current protection\n");
700 switch (dev->descriptor.bDeviceProtocol) {
703 case USB_HUB_PR_HS_SINGLE_TT:
704 debug("Single TT\n");
706 case USB_HUB_PR_HS_MULTI_TT:
707 ret = usb_set_interface(dev, 0, 1);
709 debug("TT per port\n");
710 hub->tt.multi = true;
712 debug("Using single TT (err %d)\n", ret);
716 /* USB 3.0 hubs don't have a TT */
719 debug("Unrecognized hub protocol %d\n",
720 dev->descriptor.bDeviceProtocol);
724 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
725 switch (hubCharacteristics & HUB_CHAR_TTTT) {
726 case HUB_TTTT_8_BITS:
727 if (dev->descriptor.bDeviceProtocol != 0) {
728 hub->tt.think_time = 666;
729 debug("TT requires at most %d FS bit times (%d ns)\n",
730 8, hub->tt.think_time);
733 case HUB_TTTT_16_BITS:
734 hub->tt.think_time = 666 * 2;
735 debug("TT requires at most %d FS bit times (%d ns)\n",
736 16, hub->tt.think_time);
738 case HUB_TTTT_24_BITS:
739 hub->tt.think_time = 666 * 3;
740 debug("TT requires at most %d FS bit times (%d ns)\n",
741 24, hub->tt.think_time);
743 case HUB_TTTT_32_BITS:
744 hub->tt.think_time = 666 * 4;
745 debug("TT requires at most %d FS bit times (%d ns)\n",
746 32, hub->tt.think_time);
750 debug("power on to power good time: %dms\n",
751 descriptor->bPwrOn2PwrGood * 2);
752 debug("hub controller current requirement: %dmA\n",
753 descriptor->bHubContrCurrent);
755 for (i = 0; i < dev->maxchild; i++)
756 debug("port %d is%s removable\n", i + 1,
757 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
758 (1 << ((i + 1) % 8)) ? " not" : "");
760 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
761 debug("usb_hub_configure: failed to get Status - " \
762 "too long: %d\n", descriptor->bLength);
766 ret = usb_get_hub_status(dev, buffer);
768 debug("usb_hub_configure: failed to get Status %lX\n",
773 hubsts = (struct usb_hub_status *)buffer;
775 debug("get_hub_status returned status %X, change %X\n",
776 le16_to_cpu(hubsts->wHubStatus),
777 le16_to_cpu(hubsts->wHubChange));
778 debug("local power source is %s\n",
779 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
780 "lost (inactive)" : "good");
781 debug("%sover-current condition exists\n",
782 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
785 #if CONFIG_IS_ENABLED(DM_USB)
787 * Update USB host controller's internal representation of this hub
788 * after the hub descriptor is fetched.
790 ret = usb_update_hub_device(dev);
791 if (ret < 0 && ret != -ENOSYS) {
792 debug("%s: failed to update hub device for HCD (%x)\n",
798 * A maximum of seven tiers are allowed in a USB topology, and the
799 * root hub occupies the first tier. The last tier ends with a normal
800 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
801 * to route packets to the designated downstream port. The hub uses a
802 * hub depth value multiplied by four as an offset into the 'route
803 * string' to locate the bits it uses to determine the downstream
806 if (usb_hub_is_root_hub(dev->dev)) {
809 struct udevice *hdev;
812 hdev = dev->dev->parent;
813 while (!usb_hub_is_root_hub(hdev)) {
818 hub->hub_depth = depth;
820 if (usb_hub_is_superspeed(dev)) {
821 debug("set hub (%p) depth to %d\n", dev, depth);
823 * This request sets the value that the hub uses to
824 * determine the index into the 'route string index'
827 ret = usb_set_hub_depth(dev, depth);
829 debug("%s: failed to set hub depth (%lX)\n",
830 __func__, dev->status);
837 usb_hub_power_on(hub);
840 * Reset any devices that may be in a bad state when applying
841 * the power. This is a __weak function. Resetting of the devices
842 * should occur in the board file of the device.
844 for (i = 0; i < dev->maxchild; i++)
845 usb_hub_reset_devices(hub, i + 1);
848 * Only add the connected USB devices, including potential hubs,
849 * to a scanning list. This list will get scanned and devices that
850 * are detected (either via port connected or via port timeout)
851 * will get removed from this list. Scanning of the devices on this
852 * list will continue until all devices are removed.
854 for (i = 0; i < dev->maxchild; i++) {
855 struct usb_device_scan *usb_scan;
857 usb_scan = calloc(1, sizeof(*usb_scan));
859 printf("Can't allocate memory for USB device!\n");
865 list_add_tail(&usb_scan->list, &usb_scan_list);
869 * And now call the scanning code which loops over the generated list
871 ret = usb_device_list_scan();
876 static int usb_hub_check(struct usb_device *dev, int ifnum)
878 struct usb_interface *iface;
879 struct usb_endpoint_descriptor *ep = NULL;
881 iface = &dev->config.if_desc[ifnum];
883 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
885 /* Some hubs have a subclass of 1, which AFAICT according to the */
886 /* specs is not defined, but it works */
887 if ((iface->desc.bInterfaceSubClass != 0) &&
888 (iface->desc.bInterfaceSubClass != 1))
890 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
891 if (iface->desc.bNumEndpoints != 1)
893 ep = &iface->ep_desc[0];
894 /* Output endpoint? Curiousier and curiousier.. */
895 if (!(ep->bEndpointAddress & USB_DIR_IN))
897 /* If it's not an interrupt endpoint, we'd better punt! */
898 if ((ep->bmAttributes & 3) != 3)
901 debug("USB hub found\n");
905 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
906 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
907 iface->desc.bNumEndpoints);
909 debug(" bEndpointAddress=%#x, bmAttributes=%d",
910 ep->bEndpointAddress, ep->bmAttributes);
916 int usb_hub_probe(struct usb_device *dev, int ifnum)
920 ret = usb_hub_check(dev, ifnum);
923 ret = usb_hub_configure(dev);
927 #if CONFIG_IS_ENABLED(DM_USB)
928 int usb_hub_scan(struct udevice *hub)
930 struct usb_device *udev = dev_get_parent_priv(hub);
932 return usb_hub_configure(udev);
935 static int usb_hub_post_probe(struct udevice *dev)
937 debug("%s\n", __func__);
938 return usb_hub_scan(dev);
941 static const struct udevice_id usb_hub_ids[] = {
942 { .compatible = "usb-hub" },
946 U_BOOT_DRIVER(usb_generic_hub) = {
948 .id = UCLASS_USB_HUB,
949 .of_match = usb_hub_ids,
950 .flags = DM_FLAG_ALLOC_PRIV_DMA,
953 UCLASS_DRIVER(usb_hub) = {
954 .id = UCLASS_USB_HUB,
956 .post_bind = dm_scan_fdt_dev,
957 .post_probe = usb_hub_post_probe,
958 .child_pre_probe = usb_child_pre_probe,
959 .per_child_auto_alloc_size = sizeof(struct usb_device),
960 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
961 .per_device_auto_alloc_size = sizeof(struct usb_hub_device),
964 static const struct usb_device_id hub_id_table[] = {
966 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
967 .bDeviceClass = USB_CLASS_HUB
969 { } /* Terminating entry */
972 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);