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 #define USB_BUFSIZ 512
46 #define HUB_SHORT_RESET_TIME 20
47 #define HUB_LONG_RESET_TIME 200
49 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
51 struct usb_device_scan
{
52 struct usb_device
*dev
; /* USB hub device to scan */
53 struct usb_hub_device
*hub
; /* USB hub struct */
54 int port
; /* USB port to scan */
55 struct list_head list
;
58 static LIST_HEAD(usb_scan_list
);
60 __weak
void usb_hub_reset_devices(int port
)
65 static inline bool usb_hub_is_superspeed(struct usb_device
*hdev
)
67 return hdev
->descriptor
.bDeviceProtocol
== 3;
71 bool usb_hub_is_root_hub(struct udevice
*hub
)
73 if (device_get_uclass_id(hub
->parent
) != UCLASS_USB_HUB
)
79 static int usb_set_hub_depth(struct usb_device
*dev
, int depth
)
81 if (depth
< 0 || depth
> 4)
84 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
85 USB_REQ_SET_HUB_DEPTH
, USB_DIR_OUT
| USB_RT_HUB
,
86 depth
, 0, NULL
, 0, USB_CNTL_TIMEOUT
);
90 static int usb_get_hub_descriptor(struct usb_device
*dev
, void *data
, int size
)
92 unsigned short dtype
= USB_DT_HUB
;
94 if (usb_hub_is_superspeed(dev
))
95 dtype
= USB_DT_SS_HUB
;
97 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
98 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
99 dtype
<< 8, 0, data
, size
, USB_CNTL_TIMEOUT
);
102 static int usb_clear_port_feature(struct usb_device
*dev
, int port
, int feature
)
104 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
105 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
,
106 port
, NULL
, 0, USB_CNTL_TIMEOUT
);
109 static int usb_set_port_feature(struct usb_device
*dev
, int port
, int feature
)
111 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
112 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
,
113 port
, NULL
, 0, USB_CNTL_TIMEOUT
);
116 static int usb_get_hub_status(struct usb_device
*dev
, void *data
)
118 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
119 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
120 data
, sizeof(struct usb_hub_status
), USB_CNTL_TIMEOUT
);
123 int usb_get_port_status(struct usb_device
*dev
, int port
, void *data
)
127 ret
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
128 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port
,
129 data
, sizeof(struct usb_port_status
), USB_CNTL_TIMEOUT
);
136 * Translate the USB 3.0 hub port status field into the old version
137 * that U-Boot understands. Do this only when the hub is not root hub.
138 * For root hub, the port status field has already been translated
139 * in the host controller driver (see xhci_submit_root() in xhci.c).
141 * Note: this only supports driver model.
144 if (!usb_hub_is_root_hub(dev
->dev
) && usb_hub_is_superspeed(dev
)) {
145 struct usb_port_status
*status
= (struct usb_port_status
*)data
;
146 u16 tmp
= (status
->wPortStatus
) & USB_SS_PORT_STAT_MASK
;
148 if (status
->wPortStatus
& USB_SS_PORT_STAT_POWER
)
149 tmp
|= USB_PORT_STAT_POWER
;
150 if ((status
->wPortStatus
& USB_SS_PORT_STAT_SPEED
) ==
151 USB_SS_PORT_STAT_SPEED_5GBPS
)
152 tmp
|= USB_PORT_STAT_SUPER_SPEED
;
154 status
->wPortStatus
= tmp
;
162 static void usb_hub_power_on(struct usb_hub_device
*hub
)
165 struct usb_device
*dev
;
166 unsigned pgood_delay
= hub
->desc
.bPwrOn2PwrGood
* 2;
171 debug("enabling power on all ports\n");
172 for (i
= 0; i
< dev
->maxchild
; i
++) {
173 usb_set_port_feature(dev
, i
+ 1, USB_PORT_FEAT_POWER
);
174 debug("port %d returns %lX\n", i
+ 1, dev
->status
);
177 #ifdef CONFIG_SANDBOX
179 * Don't set timeout / delay values here. This results
180 * in these values still being reset to 0.
182 if (state_get_skip_delays())
187 * Wait for power to become stable,
188 * plus spec-defined max time for device to connect
189 * but allow this time to be increased via env variable as some
190 * devices break the spec and require longer warm-up times
192 env
= env_get("usb_pgood_delay");
194 pgood_delay
= max(pgood_delay
,
195 (unsigned)simple_strtol(env
, NULL
, 0));
196 debug("pgood_delay=%dms\n", pgood_delay
);
199 * Do a minimum delay of the larger value of 100ms or pgood_delay
200 * so that the power can stablize before the devices are queried
202 hub
->query_delay
= get_timer(0) + max(100, (int)pgood_delay
);
205 * Record the power-on timeout here. The max. delay (timeout)
206 * will be done based on this value in the USB port loop in
207 * usb_hub_configure() later.
209 hub
->connect_timeout
= hub
->query_delay
+ 1000;
210 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
211 dev
->devnum
, max(100, (int)pgood_delay
),
212 max(100, (int)pgood_delay
) + 1000);
215 #ifndef CONFIG_DM_USB
216 static struct usb_hub_device hub_dev
[USB_MAX_HUB
];
217 static int usb_hub_index
;
219 void usb_hub_reset(void)
223 /* Zero out global hub_dev in case its re-used again */
224 memset(hub_dev
, 0, sizeof(hub_dev
));
227 static struct usb_hub_device
*usb_hub_allocate(void)
229 if (usb_hub_index
< USB_MAX_HUB
)
230 return &hub_dev
[usb_hub_index
++];
232 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB
);
239 static inline char *portspeed(int portstatus
)
243 switch (portstatus
& USB_PORT_STAT_SPEED_MASK
) {
244 case USB_PORT_STAT_SUPER_SPEED
:
245 speed_str
= "5 Gb/s";
247 case USB_PORT_STAT_HIGH_SPEED
:
248 speed_str
= "480 Mb/s";
250 case USB_PORT_STAT_LOW_SPEED
:
251 speed_str
= "1.5 Mb/s";
254 speed_str
= "12 Mb/s";
262 * usb_hub_port_reset() - reset a port given its usb_device pointer
264 * Reset a hub port and see if a device is present on that port, providing
265 * sufficient time for it to show itself. The port status is returned.
267 * @dev: USB device to reset
268 * @port: Port number to reset (note ports are numbered from 0 here)
269 * @portstat: Returns port status
271 static int usb_hub_port_reset(struct usb_device
*dev
, int port
,
272 unsigned short *portstat
)
275 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
276 unsigned short portstatus
, portchange
;
277 int delay
= HUB_SHORT_RESET_TIME
; /* start with short reset delay */
280 debug("%s: resetting '%s' port %d...\n", __func__
, dev
->dev
->name
,
283 debug("%s: resetting port %d...\n", __func__
, port
+ 1);
285 for (tries
= 0; tries
< MAX_TRIES
; tries
++) {
286 err
= usb_set_port_feature(dev
, port
+ 1, USB_PORT_FEAT_RESET
);
292 if (usb_get_port_status(dev
, port
+ 1, portsts
) < 0) {
293 debug("get_port_status failed status %lX\n",
297 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
298 portchange
= le16_to_cpu(portsts
->wPortChange
);
300 debug("portstatus %x, change %x, %s\n", portstatus
, portchange
,
301 portspeed(portstatus
));
303 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
304 " USB_PORT_STAT_ENABLE %d\n",
305 (portchange
& USB_PORT_STAT_C_CONNECTION
) ? 1 : 0,
306 (portstatus
& USB_PORT_STAT_CONNECTION
) ? 1 : 0,
307 (portstatus
& USB_PORT_STAT_ENABLE
) ? 1 : 0);
310 * Perhaps we should check for the following here:
311 * - C_CONNECTION hasn't been set.
312 * - CONNECTION is still set.
314 * Doing so would ensure that the device is still connected
315 * to the bus, and hasn't been unplugged or replaced while the
316 * USB bus reset was going on.
318 * However, if we do that, then (at least) a San Disk Ultra
319 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
320 * Tegra Jetson TK1 board. For some reason, the device appears
321 * to briefly drop off the bus when this second bus reset is
322 * executed, yet if we retry this loop, it'll eventually come
323 * back after another reset or two.
326 if (portstatus
& USB_PORT_STAT_ENABLE
)
329 /* Switch to long reset delay for the next round */
330 delay
= HUB_LONG_RESET_TIME
;
333 if (tries
== MAX_TRIES
) {
334 debug("Cannot enable port %i after %i retries, " \
335 "disabling port.\n", port
+ 1, MAX_TRIES
);
336 debug("Maybe the USB cable is bad?\n");
340 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_C_RESET
);
341 *portstat
= portstatus
;
345 int usb_hub_port_connect_change(struct usb_device
*dev
, int port
)
347 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
348 unsigned short portstatus
;
352 ret
= usb_get_port_status(dev
, port
+ 1, portsts
);
354 debug("get_port_status failed\n");
358 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
359 debug("portstatus %x, change %x, %s\n",
361 le16_to_cpu(portsts
->wPortChange
),
362 portspeed(portstatus
));
364 /* Clear the connection change status */
365 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_C_CONNECTION
);
367 /* Disconnect any existing devices under this port */
368 if (((!(portstatus
& USB_PORT_STAT_CONNECTION
)) &&
369 (!(portstatus
& USB_PORT_STAT_ENABLE
))) ||
370 usb_device_has_child_on_port(dev
, port
)) {
371 debug("usb_disconnect(&hub->children[port]);\n");
372 /* Return now if nothing is connected */
373 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
378 ret
= usb_hub_port_reset(dev
, port
, &portstatus
);
381 printf("cannot reset port %i!?\n", port
+ 1);
385 switch (portstatus
& USB_PORT_STAT_SPEED_MASK
) {
386 case USB_PORT_STAT_SUPER_SPEED
:
387 speed
= USB_SPEED_SUPER
;
389 case USB_PORT_STAT_HIGH_SPEED
:
390 speed
= USB_SPEED_HIGH
;
392 case USB_PORT_STAT_LOW_SPEED
:
393 speed
= USB_SPEED_LOW
;
396 speed
= USB_SPEED_FULL
;
401 struct udevice
*child
;
403 ret
= usb_scan_device(dev
->dev
, port
+ 1, speed
, &child
);
405 struct usb_device
*usb
;
407 ret
= usb_alloc_new_device(dev
->controller
, &usb
);
409 printf("cannot create new device: ret=%d", ret
);
413 dev
->children
[port
] = usb
;
416 usb
->portnr
= port
+ 1;
417 /* Run it through the hoops (find a driver, etc) */
418 ret
= usb_new_device(usb
);
420 /* Woops, disable the port */
421 usb_free_device(dev
->controller
);
422 dev
->children
[port
] = NULL
;
426 debug("hub: disabling port %d\n", port
+ 1);
427 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_ENABLE
);
433 static int usb_scan_port(struct usb_device_scan
*usb_scan
)
435 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
436 unsigned short portstatus
;
437 unsigned short portchange
;
438 struct usb_device
*dev
;
439 struct usb_hub_device
*hub
;
448 * Don't talk to the device before the query delay is expired.
449 * This is needed for voltages to stabalize.
451 if (get_timer(0) < hub
->query_delay
)
454 ret
= usb_get_port_status(dev
, i
+ 1, portsts
);
456 debug("get_port_status failed\n");
457 if (get_timer(0) >= hub
->connect_timeout
) {
458 debug("devnum=%d port=%d: timeout\n",
460 /* Remove this device from scanning list */
461 list_del(&usb_scan
->list
);
468 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
469 portchange
= le16_to_cpu(portsts
->wPortChange
);
470 debug("Port %d Status %X Change %X\n", i
+ 1, portstatus
, portchange
);
473 * No connection change happened, wait a bit more.
475 * For some situation, the hub reports no connection change but a
476 * device is connected to the port (eg: CCS bit is set but CSC is not
477 * in the PORTSC register of a root hub), ignore such case.
479 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
480 !(portstatus
& USB_PORT_STAT_CONNECTION
)) {
481 if (get_timer(0) >= hub
->connect_timeout
) {
482 debug("devnum=%d port=%d: timeout\n",
484 /* Remove this device from scanning list */
485 list_del(&usb_scan
->list
);
492 /* A new USB device is ready at this point */
493 debug("devnum=%d port=%d: USB dev found\n", dev
->devnum
, i
+ 1);
495 usb_hub_port_connect_change(dev
, i
);
497 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
498 debug("port %d enable change, status %x\n", i
+ 1, portstatus
);
499 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_C_ENABLE
);
501 * The following hack causes a ghost device problem
504 #ifndef CONFIG_USB_EHCI_FARADAY
506 * EM interference sometimes causes bad shielded USB
507 * devices to be shutdown by the hub, this hack enables
508 * them again. Works at least with mouse driver
510 if (!(portstatus
& USB_PORT_STAT_ENABLE
) &&
511 (portstatus
& USB_PORT_STAT_CONNECTION
) &&
512 usb_device_has_child_on_port(dev
, i
)) {
513 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
515 usb_hub_port_connect_change(dev
, i
);
520 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
521 debug("port %d suspend change\n", i
+ 1);
522 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_SUSPEND
);
525 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
526 debug("port %d over-current change\n", i
+ 1);
527 usb_clear_port_feature(dev
, i
+ 1,
528 USB_PORT_FEAT_C_OVER_CURRENT
);
529 /* Only power-on this one port */
530 usb_set_port_feature(dev
, i
+ 1, USB_PORT_FEAT_POWER
);
531 hub
->overcurrent_count
[i
]++;
534 * If the max-scan-count is not reached, return without removing
535 * the device from scan-list. This will re-issue a new scan.
537 if (hub
->overcurrent_count
[i
] <=
538 PORT_OVERCURRENT_MAX_SCAN_COUNT
)
541 /* Otherwise the device will get removed */
542 printf("Port %d over-current occurred %d times\n", i
+ 1,
543 hub
->overcurrent_count
[i
]);
546 if (portchange
& USB_PORT_STAT_C_RESET
) {
547 debug("port %d reset change\n", i
+ 1);
548 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_C_RESET
);
552 * We're done with this device, so let's remove this device from
555 list_del(&usb_scan
->list
);
561 static int usb_device_list_scan(void)
563 struct usb_device_scan
*usb_scan
;
564 struct usb_device_scan
*tmp
;
568 /* Only run this loop once for each controller */
575 /* We're done, once the list is empty again */
576 if (list_empty(&usb_scan_list
))
579 list_for_each_entry_safe(usb_scan
, tmp
, &usb_scan_list
, list
) {
583 ret
= usb_scan_port(usb_scan
);
591 * This USB controller has finished scanning all its connected
592 * USB devices. Set "running" back to 0, so that other USB controllers
593 * will scan their devices too.
600 static struct usb_hub_device
*usb_get_hub_device(struct usb_device
*dev
)
602 struct usb_hub_device
*hub
;
604 #ifndef CONFIG_DM_USB
605 /* "allocate" Hub device */
606 hub
= usb_hub_allocate();
608 hub
= dev_get_uclass_priv(dev
->dev
);
614 static int usb_hub_configure(struct usb_device
*dev
)
617 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer
, USB_BUFSIZ
);
618 unsigned char *bitmap
;
619 short hubCharacteristics
;
620 struct usb_hub_descriptor
*descriptor
;
621 struct usb_hub_device
*hub
;
622 __maybe_unused
struct usb_hub_status
*hubsts
;
625 hub
= usb_get_hub_device(dev
);
630 /* Get the the hub descriptor */
631 ret
= usb_get_hub_descriptor(dev
, buffer
, 4);
633 debug("usb_hub_configure: failed to get hub " \
634 "descriptor, giving up %lX\n", dev
->status
);
637 descriptor
= (struct usb_hub_descriptor
*)buffer
;
639 length
= min_t(int, descriptor
->bLength
,
640 sizeof(struct usb_hub_descriptor
));
642 ret
= usb_get_hub_descriptor(dev
, buffer
, length
);
644 debug("usb_hub_configure: failed to get hub " \
645 "descriptor 2nd giving up %lX\n", dev
->status
);
648 memcpy((unsigned char *)&hub
->desc
, buffer
, length
);
649 /* adjust 16bit values */
650 put_unaligned(le16_to_cpu(get_unaligned(
651 &descriptor
->wHubCharacteristics
)),
652 &hub
->desc
.wHubCharacteristics
);
654 bitmap
= (unsigned char *)&hub
->desc
.u
.hs
.DeviceRemovable
[0];
655 /* devices not removable by default */
656 memset(bitmap
, 0xff, (USB_MAXCHILDREN
+1+7)/8);
657 bitmap
= (unsigned char *)&hub
->desc
.u
.hs
.PortPowerCtrlMask
[0];
658 memset(bitmap
, 0xff, (USB_MAXCHILDREN
+1+7)/8); /* PowerMask = 1B */
660 for (i
= 0; i
< ((hub
->desc
.bNbrPorts
+ 1 + 7)/8); i
++)
661 hub
->desc
.u
.hs
.DeviceRemovable
[i
] =
662 descriptor
->u
.hs
.DeviceRemovable
[i
];
664 for (i
= 0; i
< ((hub
->desc
.bNbrPorts
+ 1 + 7)/8); i
++)
665 hub
->desc
.u
.hs
.PortPowerCtrlMask
[i
] =
666 descriptor
->u
.hs
.PortPowerCtrlMask
[i
];
668 dev
->maxchild
= descriptor
->bNbrPorts
;
669 debug("%d ports detected\n", dev
->maxchild
);
671 hubCharacteristics
= get_unaligned(&hub
->desc
.wHubCharacteristics
);
672 switch (hubCharacteristics
& HUB_CHAR_LPSM
) {
674 debug("ganged power switching\n");
677 debug("individual port power switching\n");
681 debug("unknown reserved power switching mode\n");
685 if (hubCharacteristics
& HUB_CHAR_COMPOUND
)
686 debug("part of a compound device\n");
688 debug("standalone hub\n");
690 switch (hubCharacteristics
& HUB_CHAR_OCPM
) {
692 debug("global over-current protection\n");
695 debug("individual port over-current protection\n");
699 debug("no over-current protection\n");
703 switch (dev
->descriptor
.bDeviceProtocol
) {
706 case USB_HUB_PR_HS_SINGLE_TT
:
707 debug("Single TT\n");
709 case USB_HUB_PR_HS_MULTI_TT
:
710 ret
= usb_set_interface(dev
, 0, 1);
712 debug("TT per port\n");
713 hub
->tt
.multi
= true;
715 debug("Using single TT (err %d)\n", ret
);
719 /* USB 3.0 hubs don't have a TT */
722 debug("Unrecognized hub protocol %d\n",
723 dev
->descriptor
.bDeviceProtocol
);
727 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
728 switch (hubCharacteristics
& HUB_CHAR_TTTT
) {
729 case HUB_TTTT_8_BITS
:
730 if (dev
->descriptor
.bDeviceProtocol
!= 0) {
731 hub
->tt
.think_time
= 666;
732 debug("TT requires at most %d FS bit times (%d ns)\n",
733 8, hub
->tt
.think_time
);
736 case HUB_TTTT_16_BITS
:
737 hub
->tt
.think_time
= 666 * 2;
738 debug("TT requires at most %d FS bit times (%d ns)\n",
739 16, hub
->tt
.think_time
);
741 case HUB_TTTT_24_BITS
:
742 hub
->tt
.think_time
= 666 * 3;
743 debug("TT requires at most %d FS bit times (%d ns)\n",
744 24, hub
->tt
.think_time
);
746 case HUB_TTTT_32_BITS
:
747 hub
->tt
.think_time
= 666 * 4;
748 debug("TT requires at most %d FS bit times (%d ns)\n",
749 32, hub
->tt
.think_time
);
753 debug("power on to power good time: %dms\n",
754 descriptor
->bPwrOn2PwrGood
* 2);
755 debug("hub controller current requirement: %dmA\n",
756 descriptor
->bHubContrCurrent
);
758 for (i
= 0; i
< dev
->maxchild
; i
++)
759 debug("port %d is%s removable\n", i
+ 1,
760 hub
->desc
.u
.hs
.DeviceRemovable
[(i
+ 1) / 8] & \
761 (1 << ((i
+ 1) % 8)) ? " not" : "");
763 if (sizeof(struct usb_hub_status
) > USB_BUFSIZ
) {
764 debug("usb_hub_configure: failed to get Status - " \
765 "too long: %d\n", descriptor
->bLength
);
769 ret
= usb_get_hub_status(dev
, buffer
);
771 debug("usb_hub_configure: failed to get Status %lX\n",
777 hubsts
= (struct usb_hub_status
*)buffer
;
780 debug("get_hub_status returned status %X, change %X\n",
781 le16_to_cpu(hubsts
->wHubStatus
),
782 le16_to_cpu(hubsts
->wHubChange
));
783 debug("local power source is %s\n",
784 (le16_to_cpu(hubsts
->wHubStatus
) & HUB_STATUS_LOCAL_POWER
) ? \
785 "lost (inactive)" : "good");
786 debug("%sover-current condition exists\n",
787 (le16_to_cpu(hubsts
->wHubStatus
) & HUB_STATUS_OVERCURRENT
) ? \
792 * Update USB host controller's internal representation of this hub
793 * after the hub descriptor is fetched.
795 ret
= usb_update_hub_device(dev
);
796 if (ret
< 0 && ret
!= -ENOSYS
) {
797 debug("%s: failed to update hub device for HCD (%x)\n",
803 * A maximum of seven tiers are allowed in a USB topology, and the
804 * root hub occupies the first tier. The last tier ends with a normal
805 * USB device. USB 3.0 hubs use a 20-bit field called 'route string'
806 * to route packets to the designated downstream port. The hub uses a
807 * hub depth value multiplied by four as an offset into the 'route
808 * string' to locate the bits it uses to determine the downstream
811 if (usb_hub_is_root_hub(dev
->dev
)) {
814 struct udevice
*hdev
;
817 hdev
= dev
->dev
->parent
;
818 while (!usb_hub_is_root_hub(hdev
)) {
823 hub
->hub_depth
= depth
;
825 if (usb_hub_is_superspeed(dev
)) {
826 debug("set hub (%p) depth to %d\n", dev
, depth
);
828 * This request sets the value that the hub uses to
829 * determine the index into the 'route string index'
832 ret
= usb_set_hub_depth(dev
, depth
);
834 debug("%s: failed to set hub depth (%lX)\n",
835 __func__
, dev
->status
);
842 usb_hub_power_on(hub
);
845 * Reset any devices that may be in a bad state when applying
846 * the power. This is a __weak function. Resetting of the devices
847 * should occur in the board file of the device.
849 for (i
= 0; i
< dev
->maxchild
; i
++)
850 usb_hub_reset_devices(i
+ 1);
853 * Only add the connected USB devices, including potential hubs,
854 * to a scanning list. This list will get scanned and devices that
855 * are detected (either via port connected or via port timeout)
856 * will get removed from this list. Scanning of the devices on this
857 * list will continue until all devices are removed.
859 for (i
= 0; i
< dev
->maxchild
; i
++) {
860 struct usb_device_scan
*usb_scan
;
862 usb_scan
= calloc(1, sizeof(*usb_scan
));
864 printf("Can't allocate memory for USB device!\n");
870 list_add_tail(&usb_scan
->list
, &usb_scan_list
);
874 * And now call the scanning code which loops over the generated list
876 ret
= usb_device_list_scan();
881 static int usb_hub_check(struct usb_device
*dev
, int ifnum
)
883 struct usb_interface
*iface
;
884 struct usb_endpoint_descriptor
*ep
= NULL
;
886 iface
= &dev
->config
.if_desc
[ifnum
];
888 if (iface
->desc
.bInterfaceClass
!= USB_CLASS_HUB
)
890 /* Some hubs have a subclass of 1, which AFAICT according to the */
891 /* specs is not defined, but it works */
892 if ((iface
->desc
.bInterfaceSubClass
!= 0) &&
893 (iface
->desc
.bInterfaceSubClass
!= 1))
895 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
896 if (iface
->desc
.bNumEndpoints
!= 1)
898 ep
= &iface
->ep_desc
[0];
899 /* Output endpoint? Curiousier and curiousier.. */
900 if (!(ep
->bEndpointAddress
& USB_DIR_IN
))
902 /* If it's not an interrupt endpoint, we'd better punt! */
903 if ((ep
->bmAttributes
& 3) != 3)
906 debug("USB hub found\n");
910 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
911 iface
->desc
.bInterfaceClass
, iface
->desc
.bInterfaceSubClass
,
912 iface
->desc
.bNumEndpoints
);
914 debug(" bEndpointAddress=%#x, bmAttributes=%d",
915 ep
->bEndpointAddress
, ep
->bmAttributes
);
921 int usb_hub_probe(struct usb_device
*dev
, int ifnum
)
925 ret
= usb_hub_check(dev
, ifnum
);
928 ret
= usb_hub_configure(dev
);
933 int usb_hub_scan(struct udevice
*hub
)
935 struct usb_device
*udev
= dev_get_parent_priv(hub
);
937 return usb_hub_configure(udev
);
940 static int usb_hub_post_probe(struct udevice
*dev
)
942 debug("%s\n", __func__
);
943 return usb_hub_scan(dev
);
946 static const struct udevice_id usb_hub_ids
[] = {
947 { .compatible
= "usb-hub" },
951 U_BOOT_DRIVER(usb_generic_hub
) = {
953 .id
= UCLASS_USB_HUB
,
954 .of_match
= usb_hub_ids
,
955 .flags
= DM_FLAG_ALLOC_PRIV_DMA
,
958 UCLASS_DRIVER(usb_hub
) = {
959 .id
= UCLASS_USB_HUB
,
961 .post_bind
= dm_scan_fdt_dev
,
962 .post_probe
= usb_hub_post_probe
,
963 .child_pre_probe
= usb_child_pre_probe
,
964 .per_child_auto_alloc_size
= sizeof(struct usb_device
),
965 .per_child_platdata_auto_alloc_size
= sizeof(struct usb_dev_platdata
),
966 .per_device_auto_alloc_size
= sizeof(struct usb_hub_device
),
969 static const struct usb_device_id hub_id_table
[] = {
971 .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
972 .bDeviceClass
= USB_CLASS_HUB
974 { } /* Terminating entry */
977 U_BOOT_USB_DEVICE(usb_generic_hub
, hub_id_table
);