2 * Most of this source has been derived from the Linux USB
4 * (C) Copyright Linus Torvalds 1999
5 * (C) Copyright Johannes Erdfelt 1999-2001
6 * (C) Copyright Andreas Gal 1999
7 * (C) Copyright Gregory P. Smith 1999
8 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
9 * (C) Copyright Randy Dunlap 2000
10 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
11 * (C) Copyright Yggdrasil Computing, Inc. 2000
12 * (usb_device_id matching changes by Adam J. Richter)
15 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
17 * SPDX-License-Identifier: GPL-2.0+
20 /****************************************************************************
22 * 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>
40 DECLARE_GLOBAL_DATA_PTR;
44 #include <asm/4xx_pci.h>
47 #define USB_BUFSIZ 512
49 #define HUB_SHORT_RESET_TIME 20
50 #define HUB_LONG_RESET_TIME 200
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 /* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
62 static struct usb_hub_device hub_dev[USB_MAX_HUB];
63 static int usb_hub_index;
64 static LIST_HEAD(usb_scan_list);
66 __weak void usb_hub_reset_devices(int port)
71 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
73 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
74 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
75 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
78 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
80 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
81 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
82 port, NULL, 0, USB_CNTL_TIMEOUT);
85 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
87 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
88 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
89 port, NULL, 0, USB_CNTL_TIMEOUT);
92 static int usb_get_hub_status(struct usb_device *dev, void *data)
94 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
95 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
96 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
99 int usb_get_port_status(struct usb_device *dev, int port, void *data)
101 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
102 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
103 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
107 static void usb_hub_power_on(struct usb_hub_device *hub)
110 struct usb_device *dev;
111 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
116 debug("enabling power on all ports\n");
117 for (i = 0; i < dev->maxchild; i++) {
118 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
119 debug("port %d returns %lX\n", i + 1, dev->status);
122 #ifdef CONFIG_SANDBOX
124 * Don't set timeout / delay values here. This results
125 * in these values still being reset to 0.
127 if (state_get_skip_delays())
132 * Wait for power to become stable,
133 * plus spec-defined max time for device to connect
134 * but allow this time to be increased via env variable as some
135 * devices break the spec and require longer warm-up times
137 env = getenv("usb_pgood_delay");
139 pgood_delay = max(pgood_delay,
140 (unsigned)simple_strtol(env, NULL, 0));
141 debug("pgood_delay=%dms\n", pgood_delay);
144 * Do a minimum delay of the larger value of 100ms or pgood_delay
145 * so that the power can stablize before the devices are queried
147 hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
150 * Record the power-on timeout here. The max. delay (timeout)
151 * will be done based on this value in the USB port loop in
152 * usb_hub_configure() later.
154 hub->connect_timeout = hub->query_delay + 1000;
155 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
156 dev->devnum, max(100, (int)pgood_delay),
157 max(100, (int)pgood_delay) + 1000);
160 void usb_hub_reset(void)
164 /* Zero out global hub_dev in case its re-used again */
165 memset(hub_dev, 0, sizeof(hub_dev));
168 static struct usb_hub_device *usb_hub_allocate(void)
170 if (usb_hub_index < USB_MAX_HUB)
171 return &hub_dev[usb_hub_index++];
173 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
179 static inline char *portspeed(int portstatus)
183 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
184 case USB_PORT_STAT_SUPER_SPEED:
185 speed_str = "5 Gb/s";
187 case USB_PORT_STAT_HIGH_SPEED:
188 speed_str = "480 Mb/s";
190 case USB_PORT_STAT_LOW_SPEED:
191 speed_str = "1.5 Mb/s";
194 speed_str = "12 Mb/s";
201 int legacy_hub_port_reset(struct usb_device *dev, int port,
202 unsigned short *portstat)
205 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
206 unsigned short portstatus, portchange;
207 int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
210 debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
213 debug("%s: resetting port %d...\n", __func__, port + 1);
215 for (tries = 0; tries < MAX_TRIES; tries++) {
216 err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
222 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
223 debug("get_port_status failed status %lX\n",
227 portstatus = le16_to_cpu(portsts->wPortStatus);
228 portchange = le16_to_cpu(portsts->wPortChange);
230 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
231 portspeed(portstatus));
233 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
234 " USB_PORT_STAT_ENABLE %d\n",
235 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
236 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
237 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
240 * Perhaps we should check for the following here:
241 * - C_CONNECTION hasn't been set.
242 * - CONNECTION is still set.
244 * Doing so would ensure that the device is still connected
245 * to the bus, and hasn't been unplugged or replaced while the
246 * USB bus reset was going on.
248 * However, if we do that, then (at least) a San Disk Ultra
249 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
250 * Tegra Jetson TK1 board. For some reason, the device appears
251 * to briefly drop off the bus when this second bus reset is
252 * executed, yet if we retry this loop, it'll eventually come
253 * back after another reset or two.
256 if (portstatus & USB_PORT_STAT_ENABLE)
259 /* Switch to long reset delay for the next round */
260 delay = HUB_LONG_RESET_TIME;
263 if (tries == MAX_TRIES) {
264 debug("Cannot enable port %i after %i retries, " \
265 "disabling port.\n", port + 1, MAX_TRIES);
266 debug("Maybe the USB cable is bad?\n");
270 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
271 *portstat = portstatus;
276 int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
278 struct usb_device *udev = dev_get_parent_priv(dev);
280 return legacy_hub_port_reset(udev, port, portstat);
284 int usb_hub_port_connect_change(struct usb_device *dev, int port)
286 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
287 unsigned short portstatus;
291 ret = usb_get_port_status(dev, port + 1, portsts);
293 debug("get_port_status failed\n");
297 portstatus = le16_to_cpu(portsts->wPortStatus);
298 debug("portstatus %x, change %x, %s\n",
300 le16_to_cpu(portsts->wPortChange),
301 portspeed(portstatus));
303 /* Clear the connection change status */
304 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
306 /* Disconnect any existing devices under this port */
307 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
308 (!(portstatus & USB_PORT_STAT_ENABLE))) ||
309 usb_device_has_child_on_port(dev, port)) {
310 debug("usb_disconnect(&hub->children[port]);\n");
311 /* Return now if nothing is connected */
312 if (!(portstatus & USB_PORT_STAT_CONNECTION))
317 ret = legacy_hub_port_reset(dev, port, &portstatus);
320 printf("cannot reset port %i!?\n", port + 1);
324 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
325 case USB_PORT_STAT_SUPER_SPEED:
326 speed = USB_SPEED_SUPER;
328 case USB_PORT_STAT_HIGH_SPEED:
329 speed = USB_SPEED_HIGH;
331 case USB_PORT_STAT_LOW_SPEED:
332 speed = USB_SPEED_LOW;
335 speed = USB_SPEED_FULL;
340 struct udevice *child;
342 ret = usb_scan_device(dev->dev, port + 1, speed, &child);
344 struct usb_device *usb;
346 ret = usb_alloc_new_device(dev->controller, &usb);
348 printf("cannot create new device: ret=%d", ret);
352 dev->children[port] = usb;
355 usb->portnr = port + 1;
356 /* Run it through the hoops (find a driver, etc) */
357 ret = usb_new_device(usb);
359 /* Woops, disable the port */
360 usb_free_device(dev->controller);
361 dev->children[port] = NULL;
365 debug("hub: disabling port %d\n", port + 1);
366 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
372 static int usb_scan_port(struct usb_device_scan *usb_scan)
374 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
375 unsigned short portstatus;
376 unsigned short portchange;
377 struct usb_device *dev;
378 struct usb_hub_device *hub;
387 * Don't talk to the device before the query delay is expired.
388 * This is needed for voltages to stabalize.
390 if (get_timer(0) < hub->query_delay)
393 ret = usb_get_port_status(dev, i + 1, portsts);
395 debug("get_port_status failed\n");
396 if (get_timer(0) >= hub->connect_timeout) {
397 debug("devnum=%d port=%d: timeout\n",
399 /* Remove this device from scanning list */
400 list_del(&usb_scan->list);
407 portstatus = le16_to_cpu(portsts->wPortStatus);
408 portchange = le16_to_cpu(portsts->wPortChange);
409 debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
411 /* No connection change happened, wait a bit more. */
412 if (!(portchange & USB_PORT_STAT_C_CONNECTION)) {
413 if (get_timer(0) >= hub->connect_timeout) {
414 debug("devnum=%d port=%d: timeout\n",
416 /* Remove this device from scanning list */
417 list_del(&usb_scan->list);
424 /* Test if the connection came up, and if not exit */
425 if (!(portstatus & USB_PORT_STAT_CONNECTION))
428 /* A new USB device is ready at this point */
429 debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
431 usb_hub_port_connect_change(dev, i);
433 if (portchange & USB_PORT_STAT_C_ENABLE) {
434 debug("port %d enable change, status %x\n", i + 1, portstatus);
435 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
437 * The following hack causes a ghost device problem
440 #ifndef CONFIG_USB_EHCI_FARADAY
442 * EM interference sometimes causes bad shielded USB
443 * devices to be shutdown by the hub, this hack enables
444 * them again. Works at least with mouse driver
446 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
447 (portstatus & USB_PORT_STAT_CONNECTION) &&
448 usb_device_has_child_on_port(dev, i)) {
449 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
451 usb_hub_port_connect_change(dev, i);
456 if (portstatus & USB_PORT_STAT_SUSPEND) {
457 debug("port %d suspend change\n", i + 1);
458 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
461 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
462 debug("port %d over-current change\n", i + 1);
463 usb_clear_port_feature(dev, i + 1,
464 USB_PORT_FEAT_C_OVER_CURRENT);
465 /* Only power-on this one port */
466 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
467 hub->overcurrent_count[i]++;
470 * If the max-scan-count is not reached, return without removing
471 * the device from scan-list. This will re-issue a new scan.
473 if (hub->overcurrent_count[i] <=
474 PORT_OVERCURRENT_MAX_SCAN_COUNT)
477 /* Otherwise the device will get removed */
478 printf("Port %d over-current occurred %d times\n", i + 1,
479 hub->overcurrent_count[i]);
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);
488 * We're done with this device, so let's remove this device from
491 list_del(&usb_scan->list);
497 static int usb_device_list_scan(void)
499 struct usb_device_scan *usb_scan;
500 struct usb_device_scan *tmp;
504 /* Only run this loop once for each controller */
511 /* We're done, once the list is empty again */
512 if (list_empty(&usb_scan_list))
515 list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
519 ret = usb_scan_port(usb_scan);
527 * This USB controller has finished scanning all its connected
528 * USB devices. Set "running" back to 0, so that other USB controllers
529 * will scan their devices too.
536 static int usb_hub_configure(struct usb_device *dev)
539 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
540 unsigned char *bitmap;
541 short hubCharacteristics;
542 struct usb_hub_descriptor *descriptor;
543 struct usb_hub_device *hub;
544 __maybe_unused struct usb_hub_status *hubsts;
547 /* "allocate" Hub device */
548 hub = usb_hub_allocate();
552 /* Get the the hub descriptor */
553 ret = usb_get_hub_descriptor(dev, buffer, 4);
555 debug("usb_hub_configure: failed to get hub " \
556 "descriptor, giving up %lX\n", dev->status);
559 descriptor = (struct usb_hub_descriptor *)buffer;
561 length = min_t(int, descriptor->bLength,
562 sizeof(struct usb_hub_descriptor));
564 ret = usb_get_hub_descriptor(dev, buffer, length);
566 debug("usb_hub_configure: failed to get hub " \
567 "descriptor 2nd giving up %lX\n", dev->status);
570 memcpy((unsigned char *)&hub->desc, buffer, length);
571 /* adjust 16bit values */
572 put_unaligned(le16_to_cpu(get_unaligned(
573 &descriptor->wHubCharacteristics)),
574 &hub->desc.wHubCharacteristics);
576 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
577 /* devices not removable by default */
578 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
579 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
580 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
582 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
583 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
585 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
586 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
588 dev->maxchild = descriptor->bNbrPorts;
589 debug("%d ports detected\n", dev->maxchild);
591 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
592 switch (hubCharacteristics & HUB_CHAR_LPSM) {
594 debug("ganged power switching\n");
597 debug("individual port power switching\n");
601 debug("unknown reserved power switching mode\n");
605 if (hubCharacteristics & HUB_CHAR_COMPOUND)
606 debug("part of a compound device\n");
608 debug("standalone hub\n");
610 switch (hubCharacteristics & HUB_CHAR_OCPM) {
612 debug("global over-current protection\n");
615 debug("individual port over-current protection\n");
619 debug("no over-current protection\n");
623 debug("power on to power good time: %dms\n",
624 descriptor->bPwrOn2PwrGood * 2);
625 debug("hub controller current requirement: %dmA\n",
626 descriptor->bHubContrCurrent);
628 for (i = 0; i < dev->maxchild; i++)
629 debug("port %d is%s removable\n", i + 1,
630 hub->desc.DeviceRemovable[(i + 1) / 8] & \
631 (1 << ((i + 1) % 8)) ? " not" : "");
633 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
634 debug("usb_hub_configure: failed to get Status - " \
635 "too long: %d\n", descriptor->bLength);
639 ret = usb_get_hub_status(dev, buffer);
641 debug("usb_hub_configure: failed to get Status %lX\n",
647 hubsts = (struct usb_hub_status *)buffer;
650 debug("get_hub_status returned status %X, change %X\n",
651 le16_to_cpu(hubsts->wHubStatus),
652 le16_to_cpu(hubsts->wHubChange));
653 debug("local power source is %s\n",
654 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
655 "lost (inactive)" : "good");
656 debug("%sover-current condition exists\n",
657 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
659 usb_hub_power_on(hub);
662 * Reset any devices that may be in a bad state when applying
663 * the power. This is a __weak function. Resetting of the devices
664 * should occur in the board file of the device.
666 for (i = 0; i < dev->maxchild; i++)
667 usb_hub_reset_devices(i + 1);
670 * Only add the connected USB devices, including potential hubs,
671 * to a scanning list. This list will get scanned and devices that
672 * are detected (either via port connected or via port timeout)
673 * will get removed from this list. Scanning of the devices on this
674 * list will continue until all devices are removed.
676 for (i = 0; i < dev->maxchild; i++) {
677 struct usb_device_scan *usb_scan;
679 usb_scan = calloc(1, sizeof(*usb_scan));
681 printf("Can't allocate memory for USB device!\n");
687 list_add_tail(&usb_scan->list, &usb_scan_list);
691 * And now call the scanning code which loops over the generated list
693 ret = usb_device_list_scan();
698 static int usb_hub_check(struct usb_device *dev, int ifnum)
700 struct usb_interface *iface;
701 struct usb_endpoint_descriptor *ep = NULL;
703 iface = &dev->config.if_desc[ifnum];
705 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
707 /* Some hubs have a subclass of 1, which AFAICT according to the */
708 /* specs is not defined, but it works */
709 if ((iface->desc.bInterfaceSubClass != 0) &&
710 (iface->desc.bInterfaceSubClass != 1))
712 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
713 if (iface->desc.bNumEndpoints != 1)
715 ep = &iface->ep_desc[0];
716 /* Output endpoint? Curiousier and curiousier.. */
717 if (!(ep->bEndpointAddress & USB_DIR_IN))
719 /* If it's not an interrupt endpoint, we'd better punt! */
720 if ((ep->bmAttributes & 3) != 3)
723 debug("USB hub found\n");
727 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
728 iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
729 iface->desc.bNumEndpoints);
731 debug(" bEndpointAddress=%#x, bmAttributes=%d",
732 ep->bEndpointAddress, ep->bmAttributes);
738 int usb_hub_probe(struct usb_device *dev, int ifnum)
742 ret = usb_hub_check(dev, ifnum);
745 ret = usb_hub_configure(dev);
750 int usb_hub_scan(struct udevice *hub)
752 struct usb_device *udev = dev_get_parent_priv(hub);
754 return usb_hub_configure(udev);
757 static int usb_hub_post_probe(struct udevice *dev)
759 debug("%s\n", __func__);
760 return usb_hub_scan(dev);
763 static const struct udevice_id usb_hub_ids[] = {
764 { .compatible = "usb-hub" },
768 U_BOOT_DRIVER(usb_generic_hub) = {
770 .id = UCLASS_USB_HUB,
771 .of_match = usb_hub_ids,
772 .flags = DM_FLAG_ALLOC_PRIV_DMA,
775 UCLASS_DRIVER(usb_hub) = {
776 .id = UCLASS_USB_HUB,
778 .post_bind = dm_scan_fdt_dev,
779 .post_probe = usb_hub_post_probe,
780 .child_pre_probe = usb_child_pre_probe,
781 .per_child_auto_alloc_size = sizeof(struct usb_device),
782 .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
785 static const struct usb_device_id hub_id_table[] = {
787 .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
788 .bDeviceClass = USB_CLASS_HUB
790 { } /* Terminating entry */
793 U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);