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
29 #include <asm/processor.h>
30 #include <asm/unaligned.h>
31 #include <linux/ctype.h>
32 #include <linux/list.h>
33 #include <asm/byteorder.h>
35 #include <asm/state.h>
37 #include <asm/unaligned.h>
41 #define USB_BUFSIZ 512
43 #define HUB_SHORT_RESET_TIME 20
44 #define HUB_LONG_RESET_TIME 200
46 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
48 struct usb_device_scan {
49 struct usb_device *dev; /* USB hub device to scan */
50 struct usb_hub_device *hub; /* USB hub struct */
51 int port; /* USB port to scan */
52 struct list_head list;
55 static LIST_HEAD(usb_scan_list);
57 __weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
62 static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
64 return hdev->descriptor.bDeviceProtocol == 3;
68 bool usb_hub_is_root_hub(struct udevice *hub)
70 if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
76 static int usb_set_hub_depth(struct usb_device *dev, int depth)
78 if (depth < 0 || depth > 4)
81 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
82 USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
83 depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
87 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
89 unsigned short dtype = USB_DT_HUB;
91 if (usb_hub_is_superspeed(dev))
92 dtype = USB_DT_SS_HUB;
94 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
95 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
96 dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
99 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
101 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
102 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
103 port, NULL, 0, USB_CNTL_TIMEOUT);
106 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
108 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
109 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
110 port, NULL, 0, USB_CNTL_TIMEOUT);
113 static int usb_get_hub_status(struct usb_device *dev, void *data)
115 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
116 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
117 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
120 int usb_get_port_status(struct usb_device *dev, int port, void *data)
124 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
125 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
126 data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
133 * Translate the USB 3.0 hub port status field into the old version
134 * that U-Boot understands. Do this only when the hub is not root hub.
135 * For root hub, the port status field has already been translated
136 * in the host controller driver (see xhci_submit_root() in xhci.c).
138 * Note: this only supports driver model.
141 if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
142 struct usb_port_status *status = (struct usb_port_status *)data;
143 u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
145 if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
146 tmp |= USB_PORT_STAT_POWER;
147 if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
148 USB_SS_PORT_STAT_SPEED_5GBPS)
149 tmp |= USB_PORT_STAT_SUPER_SPEED;
151 status->wPortStatus = tmp;
159 static void usb_hub_power_on(struct usb_hub_device *hub)
162 struct usb_device *dev;
163 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
168 debug("enabling power on all ports\n");
169 for (i = 0; i < dev->maxchild; i++) {
170 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
171 debug("port %d returns %lX\n", i + 1, dev->status);
174 #ifdef CONFIG_SANDBOX
176 * Don't set timeout / delay values here. This results
177 * in these values still being reset to 0.
179 if (state_get_skip_delays())
184 * Wait for power to become stable,
185 * plus spec-defined max time for device to connect
186 * but allow this time to be increased via env variable as some
187 * devices break the spec and require longer warm-up times
189 env = env_get("usb_pgood_delay");
191 pgood_delay = max(pgood_delay,
192 (unsigned)simple_strtol(env, NULL, 0));
193 debug("pgood_delay=%dms\n", pgood_delay);
196 * Do a minimum delay of the larger value of 100ms or pgood_delay
197 * so that the power can stablize before the devices are queried
199 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
202 * Record the power-on timeout here. The max. delay (timeout)
203 * will be done based on this value in the USB port loop in
204 * usb_hub_configure() later.
206 hub->connect_timeout = hub->query_delay + 1000;
207 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
208 dev->devnum, max(100, (int)pgood_delay),
209 max(100, (int)pgood_delay) + 1000);
212 #ifndef CONFIG_DM_USB
213 static struct usb_hub_device hub_dev[USB_MAX_HUB];
214 static int usb_hub_index;
216 void usb_hub_reset(void)
220 /* Zero out global hub_dev in case its re-used again */
221 memset(hub_dev, 0, sizeof(hub_dev));
224 static struct usb_hub_device *usb_hub_allocate(void)
226 if (usb_hub_index < USB_MAX_HUB)
227 return &hub_dev[usb_hub_index++];
229 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
236 static inline char *portspeed(int portstatus)
240 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
241 case USB_PORT_STAT_SUPER_SPEED:
242 speed_str = "5 Gb/s";
244 case USB_PORT_STAT_HIGH_SPEED:
245 speed_str = "480 Mb/s";
247 case USB_PORT_STAT_LOW_SPEED:
248 speed_str = "1.5 Mb/s";
251 speed_str = "12 Mb/s";
259 * usb_hub_port_reset() - reset a port given its usb_device pointer
261 * Reset a hub port and see if a device is present on that port, providing
262 * sufficient time for it to show itself. The port status is returned.
264 * @dev: USB device to reset
265 * @port: Port number to reset (note ports are numbered from 0 here)
266 * @portstat: Returns port status
268 static int usb_hub_port_reset(struct usb_device *dev, int port,
269 unsigned short *portstat)
272 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
273 unsigned short portstatus, portchange;
274 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
277 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
280 debug("%s: resetting port %d...\n", __func__, port + 1);
282 for (tries = 0; tries < MAX_TRIES; tries++) {
283 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
289 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
290 debug("get_port_status failed status %lX\n",
294 portstatus = le16_to_cpu(portsts->wPortStatus);
295 portchange = le16_to_cpu(portsts->wPortChange);
297 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
298 portspeed(portstatus));
300 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
301 " USB_PORT_STAT_ENABLE %d\n",
302 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
303 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
304 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
307 * Perhaps we should check for the following here:
308 * - C_CONNECTION hasn't been set.
309 * - CONNECTION is still set.
311 * Doing so would ensure that the device is still connected
312 * to the bus, and hasn't been unplugged or replaced while the
313 * USB bus reset was going on.
315 * However, if we do that, then (at least) a San Disk Ultra
316 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
317 * Tegra Jetson TK1 board. For some reason, the device appears
318 * to briefly drop off the bus when this second bus reset is
319 * executed, yet if we retry this loop, it'll eventually come
320 * back after another reset or two.
323 if (portstatus & USB_PORT_STAT_ENABLE)
326 /* Switch to long reset delay for the next round */
327 delay = HUB_LONG_RESET_TIME;
330 if (tries == MAX_TRIES) {
331 debug("Cannot enable port %i after %i retries, " \
332 "disabling port.\n", port + 1, MAX_TRIES);
333 debug("Maybe the USB cable is bad?\n");
337 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
338 *portstat = portstatus;
342 int usb_hub_port_connect_change(struct usb_device *dev, int port)
344 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
345 unsigned short portstatus;
349 ret = usb_get_port_status(dev, port + 1, portsts);
351 debug("get_port_status failed\n");
355 portstatus = le16_to_cpu(portsts->wPortStatus);
356 debug("portstatus %x, change %x, %s\n",
358 le16_to_cpu(portsts->wPortChange),
359 portspeed(portstatus));
361 /* Clear the connection change status */
362 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
364 /* Disconnect any existing devices under this port */
365 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
366 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
367 usb_device_has_child_on_port(dev, port)) {
368 debug("usb_disconnect(&hub->children[port]);\n");
369 /* Return now if nothing is connected */
370 if (!(portstatus & USB_PORT_STAT_CONNECTION))
375 ret = usb_hub_port_reset(dev, port, &portstatus);
378 printf("cannot reset port %i!?\n", port + 1);
382 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
383 case USB_PORT_STAT_SUPER_SPEED:
384 speed = USB_SPEED_SUPER;
386 case USB_PORT_STAT_HIGH_SPEED:
387 speed = USB_SPEED_HIGH;
389 case USB_PORT_STAT_LOW_SPEED:
390 speed = USB_SPEED_LOW;
393 speed = USB_SPEED_FULL;
398 struct udevice *child;
400 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
402 struct usb_device *usb;
404 ret = usb_alloc_new_device(dev->controller, &usb);
406 printf("cannot create new device: ret=%d", ret);
410 dev->children[port] = usb;
413 usb->portnr = port + 1;
414 /* Run it through the hoops (find a driver, etc) */
415 ret = usb_new_device(usb);
417 /* Woops, disable the port */
418 usb_free_device(dev->controller);
419 dev->children[port] = NULL;
423 debug("hub: disabling port %d\n", port + 1);
424 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
430 static int usb_scan_port(struct usb_device_scan *usb_scan)
432 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
433 unsigned short portstatus;
434 unsigned short portchange;
435 struct usb_device *dev;
436 struct usb_hub_device *hub;
445 * Don't talk to the device before the query delay is expired.
446 * This is needed for voltages to stabalize.
448 if (get_timer(0) < hub->query_delay)
451 ret = usb_get_port_status(dev, i + 1, portsts);
453 debug("get_port_status failed\n");
454 if (get_timer(0) >= hub->connect_timeout) {
455 debug("devnum=%d port=%d: timeout\n",
457 /* Remove this device from scanning list */
458 list_del(&usb_scan->list);
465 portstatus = le16_to_cpu(portsts->wPortStatus);
466 portchange = le16_to_cpu(portsts->wPortChange);
467 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
470 * No connection change happened, wait a bit more.
472 * For some situation, the hub reports no connection change but a
473 * device is connected to the port (eg: CCS bit is set but CSC is not
474 * in the PORTSC register of a root hub), ignore such case.
476 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
477 !(portstatus & USB_PORT_STAT_CONNECTION)) {
478 if (get_timer(0) >= hub->connect_timeout) {
479 debug("devnum=%d port=%d: timeout\n",
481 /* Remove this device from scanning list */
482 list_del(&usb_scan->list);
489 if (portchange & USB_PORT_STAT_C_RESET) {
490 debug("port %d reset change\n", i + 1);
491 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
494 if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
495 usb_hub_is_superspeed(dev)) {
496 debug("port %d BH reset change\n", i + 1);
497 usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
500 /* A new USB device is ready at this point */
501 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
503 usb_hub_port_connect_change(dev, i);
505 if (portchange & USB_PORT_STAT_C_ENABLE) {
506 debug("port %d enable change, status %x\n", i + 1, portstatus);
507 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
509 * The following hack causes a ghost device problem
512 #ifndef CONFIG_USB_EHCI_FARADAY
514 * EM interference sometimes causes bad shielded USB
515 * devices to be shutdown by the hub, this hack enables
516 * them again. Works at least with mouse driver
518 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
519 (portstatus & USB_PORT_STAT_CONNECTION) &&
520 usb_device_has_child_on_port(dev, i)) {
521 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
523 usb_hub_port_connect_change(dev, i);
528 if (portstatus & USB_PORT_STAT_SUSPEND) {
529 debug("port %d suspend change\n", i + 1);
530 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
533 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
534 debug("port %d over-current change\n", i + 1);
535 usb_clear_port_feature(dev, i + 1,
536 USB_PORT_FEAT_C_OVER_CURRENT);
537 /* Only power-on this one port */
538 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
539 hub->overcurrent_count[i]++;
542 * If the max-scan-count is not reached, return without removing
543 * the device from scan-list. This will re-issue a new scan.
545 if (hub->overcurrent_count[i] <=
546 PORT_OVERCURRENT_MAX_SCAN_COUNT)
549 /* Otherwise the device will get removed */
550 printf("Port %d over-current occurred %d times\n", i + 1,
551 hub->overcurrent_count[i]);
555 * We're done with this device, so let's remove this device from
558 list_del(&usb_scan->list);
564 static int usb_device_list_scan(void)
566 struct usb_device_scan *usb_scan;
567 struct usb_device_scan *tmp;
571 /* Only run this loop once for each controller */
578 /* We're done, once the list is empty again */
579 if (list_empty(&usb_scan_list))
582 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
586 ret = usb_scan_port(usb_scan);
594 * This USB controller has finished scanning all its connected
595 * USB devices. Set "running" back to 0, so that other USB controllers
596 * will scan their devices too.
603 static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
605 struct usb_hub_device *hub;
607 #ifndef CONFIG_DM_USB
608 /* "allocate" Hub device */
609 hub = usb_hub_allocate();
611 hub = dev_get_uclass_priv(dev->dev);
617 static int usb_hub_configure(struct usb_device *dev)
620 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
621 unsigned char *bitmap;
622 short hubCharacteristics;
623 struct usb_hub_descriptor *descriptor;
624 struct usb_hub_device *hub;
625 struct usb_hub_status *hubsts;
628 hub = usb_get_hub_device(dev);
633 /* Get the the hub descriptor */
634 ret = usb_get_hub_descriptor(dev, buffer, 4);
636 debug("usb_hub_configure: failed to get hub " \
637 "descriptor, giving up %lX\n", dev->status);
640 descriptor = (struct usb_hub_descriptor *)buffer;
642 length = min_t(int, descriptor->bLength,
643 sizeof(struct usb_hub_descriptor));
645 ret = usb_get_hub_descriptor(dev, buffer, length);
647 debug("usb_hub_configure: failed to get hub " \
648 "descriptor 2nd giving up %lX\n", dev->status);
651 memcpy((unsigned char *)&hub->desc, buffer, length);
652 /* adjust 16bit values */
653 put_unaligned(le16_to_cpu(get_unaligned(
654 &descriptor->wHubCharacteristics)),
655 &hub->desc.wHubCharacteristics);
657 bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
658 /* devices not removable by default */
659 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
660 bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
661 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
663 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
664 hub->desc.u.hs.DeviceRemovable[i] =
665 descriptor->u.hs.DeviceRemovable[i];
667 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
668 hub->desc.u.hs.PortPowerCtrlMask[i] =
669 descriptor->u.hs.PortPowerCtrlMask[i];
671 dev->maxchild = descriptor->bNbrPorts;
672 debug("%d ports detected\n", dev->maxchild);
674 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
675 switch (hubCharacteristics & HUB_CHAR_LPSM) {
677 debug("ganged power switching\n");
680 debug("individual port power switching\n");
684 debug("unknown reserved power switching mode\n");
688 if (hubCharacteristics & HUB_CHAR_COMPOUND)
689 debug("part of a compound device\n");
691 debug("standalone hub\n");
693 switch (hubCharacteristics & HUB_CHAR_OCPM) {
695 debug("global over-current protection\n");
698 debug("individual port over-current protection\n");
702 debug("no over-current protection\n");
706 switch (dev->descriptor.bDeviceProtocol) {
709 case USB_HUB_PR_HS_SINGLE_TT:
710 debug("Single TT\n");
712 case USB_HUB_PR_HS_MULTI_TT:
713 ret = usb_set_interface(dev, 0, 1);
715 debug("TT per port\n");
716 hub->tt.multi = true;
718 debug("Using single TT (err %d)\n", ret);
722 /* USB 3.0 hubs don't have a TT */
725 debug("Unrecognized hub protocol %d\n",
726 dev->descriptor.bDeviceProtocol);
730 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
731 switch (hubCharacteristics & HUB_CHAR_TTTT) {
732 case HUB_TTTT_8_BITS:
733 if (dev->descriptor.bDeviceProtocol != 0) {
734 hub->tt.think_time = 666;
735 debug("TT requires at most %d FS bit times (%d ns)\n",
736 8, hub->tt.think_time);
739 case HUB_TTTT_16_BITS:
740 hub->tt.think_time = 666 * 2;
741 debug("TT requires at most %d FS bit times (%d ns)\n",
742 16, hub->tt.think_time);
744 case HUB_TTTT_24_BITS:
745 hub->tt.think_time = 666 * 3;
746 debug("TT requires at most %d FS bit times (%d ns)\n",
747 24, hub->tt.think_time);
749 case HUB_TTTT_32_BITS:
750 hub->tt.think_time = 666 * 4;
751 debug("TT requires at most %d FS bit times (%d ns)\n",
752 32, hub->tt.think_time);
756 debug("power on to power good time: %dms\n",
757 descriptor->bPwrOn2PwrGood * 2);
758 debug("hub controller current requirement: %dmA\n",
759 descriptor->bHubContrCurrent);
761 for (i = 0; i < dev->maxchild; i++)
762 debug("port %d is%s removable\n", i + 1,
763 hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
764 (1 << ((i + 1) % 8)) ? " not" : "");
766 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
767 debug("usb_hub_configure: failed to get Status - " \
768 "too long: %d\n", descriptor->bLength);
772 ret = usb_get_hub_status(dev, buffer);
774 debug("usb_hub_configure: failed to get Status %lX\n",
779 hubsts = (struct usb_hub_status *)buffer;
781 debug("get_hub_status returned status %X, change %X\n",
782 le16_to_cpu(hubsts->wHubStatus),
783 le16_to_cpu(hubsts->wHubChange));
784 debug("local power source is %s\n",
785 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
786 "lost (inactive)" : "good");
787 debug("%sover-current condition exists\n",
788 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
793 * Update USB host controller's internal representation of this hub
794 * after the hub descriptor is fetched.
796 ret = usb_update_hub_device(dev);
797 if (ret < 0 && ret != -ENOSYS) {
798 debug("%s: failed to update hub device for HCD (%x)\n",
804 * A maximum of seven tiers are allowed in a USB topology, and the
805 * root hub occupies the first tier. The last tier ends with a normal
806 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
807 * to route packets to the designated downstream port. The hub uses a
808 * hub depth value multiplied by four as an offset into the 'route
809 * string' to locate the bits it uses to determine the downstream
812 if (usb_hub_is_root_hub(dev->dev)) {
815 struct udevice *hdev;
818 hdev = dev->dev->parent;
819 while (!usb_hub_is_root_hub(hdev)) {
824 hub->hub_depth = depth;
826 if (usb_hub_is_superspeed(dev)) {
827 debug("set hub (%p) depth to %d\n", dev, depth);
829 * This request sets the value that the hub uses to
830 * determine the index into the 'route string index'
833 ret = usb_set_hub_depth(dev, depth);
835 debug("%s: failed to set hub depth (%lX)\n",
836 __func__, dev->status);
843 usb_hub_power_on(hub);
846 * Reset any devices that may be in a bad state when applying
847 * the power. This is a __weak function. Resetting of the devices
848 * should occur in the board file of the device.
850 for (i = 0; i < dev->maxchild; i++)
851 usb_hub_reset_devices(hub, i + 1);
854 * Only add the connected USB devices, including potential hubs,
855 * to a scanning list. This list will get scanned and devices that
856 * are detected (either via port connected or via port timeout)
857 * will get removed from this list. Scanning of the devices on this
858 * list will continue until all devices are removed.
860 for (i = 0; i < dev->maxchild; i++) {
861 struct usb_device_scan *usb_scan;
863 usb_scan = calloc(1, sizeof(*usb_scan));
865 printf("Can't allocate memory for USB device!\n");
871 list_add_tail(&usb_scan->list, &usb_scan_list);
875 * And now call the scanning code which loops over the generated list
877 ret = usb_device_list_scan();
882 static int usb_hub_check(struct usb_device *dev, int ifnum)
884 struct usb_interface *iface;
885 struct usb_endpoint_descriptor *ep = NULL;
887 iface = &dev->config.if_desc[ifnum];
889 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
891 /* Some hubs have a subclass of 1, which AFAICT according to the */
892 /* specs is not defined, but it works */
893 if ((iface->desc.bInterfaceSubClass != 0) &&
894 (iface->desc.bInterfaceSubClass != 1))
896 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
897 if (iface->desc.bNumEndpoints != 1)
899 ep = &iface->ep_desc[0];
900 /* Output endpoint? Curiousier and curiousier.. */
901 if (!(ep->bEndpointAddress & USB_DIR_IN))
903 /* If it's not an interrupt endpoint, we'd better punt! */
904 if ((ep->bmAttributes & 3) != 3)
907 debug("USB hub found\n");
911 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
912 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
913 iface->desc.bNumEndpoints);
915 debug(" bEndpointAddress=%#x, bmAttributes=%d",
916 ep->bEndpointAddress, ep->bmAttributes);
922 int usb_hub_probe(struct usb_device *dev, int ifnum)
926 ret = usb_hub_check(dev, ifnum);
929 ret = usb_hub_configure(dev);
934 int usb_hub_scan(struct udevice *hub)
936 struct usb_device *udev = dev_get_parent_priv(hub);
938 return usb_hub_configure(udev);
941 static int usb_hub_post_probe(struct udevice *dev)
943 debug("%s\n", __func__);
944 return usb_hub_scan(dev);
947 static const struct udevice_id usb_hub_ids[] = {
948 { .compatible = "usb-hub" },
952 U_BOOT_DRIVER(usb_generic_hub) = {
954 .id = UCLASS_USB_HUB,
955 .of_match = usb_hub_ids,
956 .flags = DM_FLAG_ALLOC_PRIV_DMA,
959 UCLASS_DRIVER(usb_hub) = {
960 .id = UCLASS_USB_HUB,
962 .post_bind = dm_scan_fdt_dev,
963 .post_probe = usb_hub_post_probe,
964 .child_pre_probe = usb_child_pre_probe,
965 .per_child_auto_alloc_size = sizeof(struct usb_device),
966 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
967 .per_device_auto_alloc_size = sizeof(struct usb_hub_device),
970 static const struct usb_device_id hub_id_table[] = {
972 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
973 .bDeviceClass = USB_CLASS_HUB
975 { } /* Terminating entry */
978 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);