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
27 #include <asm/processor.h>
28 #include <asm/unaligned.h>
29 #include <linux/ctype.h>
30 #include <asm/byteorder.h>
31 #include <asm/unaligned.h>
35 #include <asm/4xx_pci.h>
38 #define USB_BUFSIZ 512
40 static struct usb_hub_device hub_dev[USB_MAX_HUB];
41 static int usb_hub_index;
43 __weak void usb_hub_reset_devices(int port)
48 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
50 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
51 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
52 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
55 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
57 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
58 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
59 port, NULL, 0, USB_CNTL_TIMEOUT);
62 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
64 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
65 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
66 port, NULL, 0, USB_CNTL_TIMEOUT);
69 static int usb_get_hub_status(struct usb_device *dev, void *data)
71 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
72 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
73 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
76 static int usb_get_port_status(struct usb_device *dev, int port, void *data)
78 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
79 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
80 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
84 static void usb_hub_power_on(struct usb_hub_device *hub)
87 struct usb_device *dev;
88 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
89 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
90 unsigned short portstatus;
96 * Enable power to the ports:
97 * Here we Power-cycle the ports: aka,
98 * turning them off and turning on again.
100 debug("enabling power on all ports\n");
101 for (i = 0; i < dev->maxchild; i++) {
102 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
103 debug("port %d returns %lX\n", i + 1, dev->status);
106 /* Wait at least 2*bPwrOn2PwrGood for PP to change */
109 for (i = 0; i < dev->maxchild; i++) {
110 ret = usb_get_port_status(dev, i + 1, portsts);
112 debug("port %d: get_port_status failed\n", i + 1);
117 * Check to confirm the state of Port Power:
118 * xHCI says "After modifying PP, s/w shall read
119 * PP and confirm that it has reached the desired state
120 * before modifying it again, undefined behavior may occur
121 * if this procedure is not followed".
122 * EHCI doesn't say anything like this, but no harm in keeping
125 portstatus = le16_to_cpu(portsts->wPortStatus);
126 if (portstatus & (USB_PORT_STAT_POWER << 1)) {
127 debug("port %d: Port power change failed\n", i + 1);
132 for (i = 0; i < dev->maxchild; i++) {
133 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
134 debug("port %d returns %lX\n", i + 1, dev->status);
138 * Wait for power to become stable,
139 * plus spec-defined max time for device to connect
141 mdelay(pgood_delay + 1000);
144 void usb_hub_reset(void)
149 static struct usb_hub_device *usb_hub_allocate(void)
151 if (usb_hub_index < USB_MAX_HUB)
152 return &hub_dev[usb_hub_index++];
154 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
160 static inline char *portspeed(int portstatus)
164 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
165 case USB_PORT_STAT_SUPER_SPEED:
166 speed_str = "5 Gb/s";
168 case USB_PORT_STAT_HIGH_SPEED:
169 speed_str = "480 Mb/s";
171 case USB_PORT_STAT_LOW_SPEED:
172 speed_str = "1.5 Mb/s";
175 speed_str = "12 Mb/s";
182 int hub_port_reset(struct usb_device *dev, int port,
183 unsigned short *portstat)
186 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
187 unsigned short portstatus, portchange;
189 debug("hub_port_reset: resetting port %d...\n", port);
190 for (tries = 0; tries < MAX_TRIES; tries++) {
192 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
195 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
196 debug("get_port_status failed status %lX\n",
200 portstatus = le16_to_cpu(portsts->wPortStatus);
201 portchange = le16_to_cpu(portsts->wPortChange);
203 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
204 portspeed(portstatus));
206 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
207 " USB_PORT_STAT_ENABLE %d\n",
208 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
209 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
210 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
212 if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
213 !(portstatus & USB_PORT_STAT_CONNECTION))
216 if (portstatus & USB_PORT_STAT_ENABLE)
222 if (tries == MAX_TRIES) {
223 debug("Cannot enable port %i after %i retries, " \
224 "disabling port.\n", port + 1, MAX_TRIES);
225 debug("Maybe the USB cable is bad?\n");
229 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
230 *portstat = portstatus;
235 void usb_hub_port_connect_change(struct usb_device *dev, int port)
237 struct usb_device *usb;
238 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
239 unsigned short portstatus;
242 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
243 debug("get_port_status failed\n");
247 portstatus = le16_to_cpu(portsts->wPortStatus);
248 debug("portstatus %x, change %x, %s\n",
250 le16_to_cpu(portsts->wPortChange),
251 portspeed(portstatus));
253 /* Clear the connection change status */
254 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
256 /* Disconnect any existing devices under this port */
257 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
258 (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
259 debug("usb_disconnect(&hub->children[port]);\n");
260 /* Return now if nothing is connected */
261 if (!(portstatus & USB_PORT_STAT_CONNECTION))
267 if (hub_port_reset(dev, port, &portstatus) < 0) {
268 printf("cannot reset port %i!?\n", port + 1);
274 /* Allocate a new device struct for it */
275 usb = usb_alloc_new_device(dev->controller);
277 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
278 case USB_PORT_STAT_SUPER_SPEED:
279 usb->speed = USB_SPEED_SUPER;
281 case USB_PORT_STAT_HIGH_SPEED:
282 usb->speed = USB_SPEED_HIGH;
284 case USB_PORT_STAT_LOW_SPEED:
285 usb->speed = USB_SPEED_LOW;
288 usb->speed = USB_SPEED_FULL;
292 dev->children[port] = usb;
294 usb->portnr = port + 1;
295 /* Run it through the hoops (find a driver, etc) */
296 if (usb_new_device(usb)) {
297 /* Woops, disable the port */
299 dev->children[port] = NULL;
300 debug("hub: disabling port %d\n", port + 1);
301 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
306 static int usb_hub_configure(struct usb_device *dev)
309 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
310 unsigned char *bitmap;
311 short hubCharacteristics;
312 struct usb_hub_descriptor *descriptor;
313 struct usb_hub_device *hub;
314 __maybe_unused struct usb_hub_status *hubsts;
316 /* "allocate" Hub device */
317 hub = usb_hub_allocate();
321 /* Get the the hub descriptor */
322 if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
323 debug("usb_hub_configure: failed to get hub " \
324 "descriptor, giving up %lX\n", dev->status);
327 descriptor = (struct usb_hub_descriptor *)buffer;
329 length = min(descriptor->bLength, sizeof(struct usb_hub_descriptor));
331 if (usb_get_hub_descriptor(dev, buffer, length) < 0) {
332 debug("usb_hub_configure: failed to get hub " \
333 "descriptor 2nd giving up %lX\n", dev->status);
336 memcpy((unsigned char *)&hub->desc, buffer, length);
337 /* adjust 16bit values */
338 put_unaligned(le16_to_cpu(get_unaligned(
339 &descriptor->wHubCharacteristics)),
340 &hub->desc.wHubCharacteristics);
342 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
343 /* devices not removable by default */
344 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
345 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
346 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
348 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
349 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
351 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
352 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
354 dev->maxchild = descriptor->bNbrPorts;
355 debug("%d ports detected\n", dev->maxchild);
357 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
358 switch (hubCharacteristics & HUB_CHAR_LPSM) {
360 debug("ganged power switching\n");
363 debug("individual port power switching\n");
367 debug("unknown reserved power switching mode\n");
371 if (hubCharacteristics & HUB_CHAR_COMPOUND)
372 debug("part of a compound device\n");
374 debug("standalone hub\n");
376 switch (hubCharacteristics & HUB_CHAR_OCPM) {
378 debug("global over-current protection\n");
381 debug("individual port over-current protection\n");
385 debug("no over-current protection\n");
389 debug("power on to power good time: %dms\n",
390 descriptor->bPwrOn2PwrGood * 2);
391 debug("hub controller current requirement: %dmA\n",
392 descriptor->bHubContrCurrent);
394 for (i = 0; i < dev->maxchild; i++)
395 debug("port %d is%s removable\n", i + 1,
396 hub->desc.DeviceRemovable[(i + 1) / 8] & \
397 (1 << ((i + 1) % 8)) ? " not" : "");
399 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
400 debug("usb_hub_configure: failed to get Status - " \
401 "too long: %d\n", descriptor->bLength);
405 if (usb_get_hub_status(dev, buffer) < 0) {
406 debug("usb_hub_configure: failed to get Status %lX\n",
412 hubsts = (struct usb_hub_status *)buffer;
415 debug("get_hub_status returned status %X, change %X\n",
416 le16_to_cpu(hubsts->wHubStatus),
417 le16_to_cpu(hubsts->wHubChange));
418 debug("local power source is %s\n",
419 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
420 "lost (inactive)" : "good");
421 debug("%sover-current condition exists\n",
422 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
424 usb_hub_power_on(hub);
427 * Reset any devices that may be in a bad state when applying
428 * the power. This is a __weak function. Resetting of the devices
429 * should occur in the board file of the device.
431 for (i = 0; i < dev->maxchild; i++)
432 usb_hub_reset_devices(i + 1);
434 for (i = 0; i < dev->maxchild; i++) {
435 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
436 unsigned short portstatus, portchange;
438 ulong start = get_timer(0);
441 * Wait for (whichever finishes first)
442 * - A maximum of 10 seconds
443 * This is a purely observational value driven by connecting
444 * a few broken pen drives and taking the max * 1.5 approach
445 * - connection_change and connection state to report same
449 ret = usb_get_port_status(dev, i + 1, portsts);
451 debug("get_port_status failed\n");
455 portstatus = le16_to_cpu(portsts->wPortStatus);
456 portchange = le16_to_cpu(portsts->wPortChange);
458 if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
459 (portstatus & USB_PORT_STAT_CONNECTION))
462 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
467 debug("Port %d Status %X Change %X\n",
468 i + 1, portstatus, portchange);
470 if (portchange & USB_PORT_STAT_C_CONNECTION) {
471 debug("port %d connection change\n", i + 1);
472 usb_hub_port_connect_change(dev, i);
474 if (portchange & USB_PORT_STAT_C_ENABLE) {
475 debug("port %d enable change, status %x\n",
477 usb_clear_port_feature(dev, i + 1,
478 USB_PORT_FEAT_C_ENABLE);
480 * The following hack causes a ghost device problem
483 #ifndef CONFIG_USB_EHCI_FARADAY
484 /* EM interference sometimes causes bad shielded USB
485 * devices to be shutdown by the hub, this hack enables
486 * them again. Works at least with mouse driver */
487 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
488 (portstatus & USB_PORT_STAT_CONNECTION) &&
489 ((dev->children[i]))) {
490 debug("already running port %i " \
491 "disabled by hub (EMI?), " \
492 "re-enabling...\n", i + 1);
493 usb_hub_port_connect_change(dev, i);
497 if (portstatus & USB_PORT_STAT_SUSPEND) {
498 debug("port %d suspend change\n", i + 1);
499 usb_clear_port_feature(dev, i + 1,
500 USB_PORT_FEAT_SUSPEND);
503 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
504 debug("port %d over-current change\n", i + 1);
505 usb_clear_port_feature(dev, i + 1,
506 USB_PORT_FEAT_C_OVER_CURRENT);
507 usb_hub_power_on(hub);
510 if (portchange & USB_PORT_STAT_C_RESET) {
511 debug("port %d reset change\n", i + 1);
512 usb_clear_port_feature(dev, i + 1,
513 USB_PORT_FEAT_C_RESET);
515 } /* end for i all ports */
520 int usb_hub_probe(struct usb_device *dev, int ifnum)
522 struct usb_interface *iface;
523 struct usb_endpoint_descriptor *ep;
526 iface = &dev->config.if_desc[ifnum];
528 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
530 /* Some hubs have a subclass of 1, which AFAICT according to the */
531 /* specs is not defined, but it works */
532 if ((iface->desc.bInterfaceSubClass != 0) &&
533 (iface->desc.bInterfaceSubClass != 1))
535 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
536 if (iface->desc.bNumEndpoints != 1)
538 ep = &iface->ep_desc[0];
539 /* Output endpoint? Curiousier and curiousier.. */
540 if (!(ep->bEndpointAddress & USB_DIR_IN))
542 /* If it's not an interrupt endpoint, we'd better punt! */
543 if ((ep->bmAttributes & 3) != 3)
546 debug("USB hub found\n");
547 ret = usb_hub_configure(dev);