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
18 * See file CREDITS for list of people who contributed to this
21 * This program is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU General Public License as
23 * published by the Free Software Foundation; either version 2 of
24 * the License, or (at your option) any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
38 /****************************************************************************
40 * Probes device for being a hub and configurate it
45 #include <asm/processor.h>
46 #include <asm/unaligned.h>
47 #include <linux/ctype.h>
48 #include <asm/byteorder.h>
49 #include <asm/unaligned.h>
53 #include <asm/4xx_pci.h>
56 #ifndef CONFIG_USB_HUB_MIN_POWER_ON_DELAY
57 #define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 100
60 #define USB_BUFSIZ 512
62 static struct usb_hub_device hub_dev[USB_MAX_HUB];
63 static int usb_hub_index;
66 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
68 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
69 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
70 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
73 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
75 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
76 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
77 port, NULL, 0, USB_CNTL_TIMEOUT);
80 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
82 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
83 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
84 port, NULL, 0, USB_CNTL_TIMEOUT);
87 static int usb_get_hub_status(struct usb_device *dev, void *data)
89 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
90 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
91 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
94 static int usb_get_port_status(struct usb_device *dev, int port, void *data)
96 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
97 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
98 data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
102 static void usb_hub_power_on(struct usb_hub_device *hub)
105 struct usb_device *dev;
106 unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
107 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
108 unsigned short portstatus;
114 * Enable power to the ports:
115 * Here we Power-cycle the ports: aka,
116 * turning them off and turning on again.
118 debug("enabling power on all ports\n");
119 for (i = 0; i < dev->maxchild; i++) {
120 usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
121 debug("port %d returns %lX\n", i + 1, dev->status);
124 /* Wait at least 2*bPwrOn2PwrGood for PP to change */
127 for (i = 0; i < dev->maxchild; i++) {
128 ret = usb_get_port_status(dev, i + 1, portsts);
130 debug("port %d: get_port_status failed\n", i + 1);
135 * Check to confirm the state of Port Power:
136 * xHCI says "After modifying PP, s/w shall read
137 * PP and confirm that it has reached the desired state
138 * before modifying it again, undefined behavior may occur
139 * if this procedure is not followed".
140 * EHCI doesn't say anything like this, but no harm in keeping
143 portstatus = le16_to_cpu(portsts->wPortStatus);
144 if (portstatus & (USB_PORT_STAT_POWER << 1)) {
145 debug("port %d: Port power change failed\n", i + 1);
150 for (i = 0; i < dev->maxchild; i++) {
151 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
152 debug("port %d returns %lX\n", i + 1, dev->status);
155 /* Wait for power to become stable */
156 mdelay(max(pgood_delay, CONFIG_USB_HUB_MIN_POWER_ON_DELAY));
159 void usb_hub_reset(void)
164 static struct usb_hub_device *usb_hub_allocate(void)
166 if (usb_hub_index < USB_MAX_HUB)
167 return &hub_dev[usb_hub_index++];
169 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
175 static inline char *portspeed(int portstatus)
179 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
180 case USB_PORT_STAT_SUPER_SPEED:
181 speed_str = "5 Gb/s";
183 case USB_PORT_STAT_HIGH_SPEED:
184 speed_str = "480 Mb/s";
186 case USB_PORT_STAT_LOW_SPEED:
187 speed_str = "1.5 Mb/s";
190 speed_str = "12 Mb/s";
197 int hub_port_reset(struct usb_device *dev, int port,
198 unsigned short *portstat)
201 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
202 unsigned short portstatus, portchange;
204 debug("hub_port_reset: resetting port %d...\n", port);
205 for (tries = 0; tries < MAX_TRIES; tries++) {
207 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
210 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
211 debug("get_port_status failed status %lX\n",
215 portstatus = le16_to_cpu(portsts->wPortStatus);
216 portchange = le16_to_cpu(portsts->wPortChange);
218 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
219 portspeed(portstatus));
221 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
222 " USB_PORT_STAT_ENABLE %d\n",
223 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
224 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
225 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
227 if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
228 !(portstatus & USB_PORT_STAT_CONNECTION))
231 if (portstatus & USB_PORT_STAT_ENABLE)
237 if (tries == MAX_TRIES) {
238 debug("Cannot enable port %i after %i retries, " \
239 "disabling port.\n", port + 1, MAX_TRIES);
240 debug("Maybe the USB cable is bad?\n");
244 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
245 *portstat = portstatus;
250 void usb_hub_port_connect_change(struct usb_device *dev, int port)
252 struct usb_device *usb;
253 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
254 unsigned short portstatus;
257 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
258 debug("get_port_status failed\n");
262 portstatus = le16_to_cpu(portsts->wPortStatus);
263 debug("portstatus %x, change %x, %s\n",
265 le16_to_cpu(portsts->wPortChange),
266 portspeed(portstatus));
268 /* Clear the connection change status */
269 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
271 /* Disconnect any existing devices under this port */
272 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
273 (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
274 debug("usb_disconnect(&hub->children[port]);\n");
275 /* Return now if nothing is connected */
276 if (!(portstatus & USB_PORT_STAT_CONNECTION))
282 if (hub_port_reset(dev, port, &portstatus) < 0) {
283 printf("cannot reset port %i!?\n", port + 1);
289 /* Allocate a new device struct for it */
290 usb = usb_alloc_new_device(dev->controller);
292 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
293 case USB_PORT_STAT_SUPER_SPEED:
294 usb->speed = USB_SPEED_SUPER;
296 case USB_PORT_STAT_HIGH_SPEED:
297 usb->speed = USB_SPEED_HIGH;
299 case USB_PORT_STAT_LOW_SPEED:
300 usb->speed = USB_SPEED_LOW;
303 usb->speed = USB_SPEED_FULL;
307 dev->children[port] = usb;
309 usb->portnr = port + 1;
310 /* Run it through the hoops (find a driver, etc) */
311 if (usb_new_device(usb)) {
312 /* Woops, disable the port */
314 dev->children[port] = NULL;
315 debug("hub: disabling port %d\n", port + 1);
316 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
321 static int usb_hub_configure(struct usb_device *dev)
324 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
325 unsigned char *bitmap;
326 short hubCharacteristics;
327 struct usb_hub_descriptor *descriptor;
328 struct usb_hub_device *hub;
329 __maybe_unused struct usb_hub_status *hubsts;
331 /* "allocate" Hub device */
332 hub = usb_hub_allocate();
336 /* Get the the hub descriptor */
337 if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
338 debug("usb_hub_configure: failed to get hub " \
339 "descriptor, giving up %lX\n", dev->status);
342 descriptor = (struct usb_hub_descriptor *)buffer;
344 /* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
345 i = descriptor->bLength;
346 if (i > USB_BUFSIZ) {
347 debug("usb_hub_configure: failed to get hub " \
348 "descriptor - too long: %d\n", descriptor->bLength);
352 if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
353 debug("usb_hub_configure: failed to get hub " \
354 "descriptor 2nd giving up %lX\n", dev->status);
357 memcpy((unsigned char *)&hub->desc, buffer, descriptor->bLength);
358 /* adjust 16bit values */
359 put_unaligned(le16_to_cpu(get_unaligned(
360 &descriptor->wHubCharacteristics)),
361 &hub->desc.wHubCharacteristics);
363 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
364 /* devices not removable by default */
365 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
366 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
367 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
369 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
370 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
372 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
373 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
375 dev->maxchild = descriptor->bNbrPorts;
376 debug("%d ports detected\n", dev->maxchild);
378 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
379 switch (hubCharacteristics & HUB_CHAR_LPSM) {
381 debug("ganged power switching\n");
384 debug("individual port power switching\n");
388 debug("unknown reserved power switching mode\n");
392 if (hubCharacteristics & HUB_CHAR_COMPOUND)
393 debug("part of a compound device\n");
395 debug("standalone hub\n");
397 switch (hubCharacteristics & HUB_CHAR_OCPM) {
399 debug("global over-current protection\n");
402 debug("individual port over-current protection\n");
406 debug("no over-current protection\n");
410 debug("power on to power good time: %dms\n",
411 descriptor->bPwrOn2PwrGood * 2);
412 debug("hub controller current requirement: %dmA\n",
413 descriptor->bHubContrCurrent);
415 for (i = 0; i < dev->maxchild; i++)
416 debug("port %d is%s removable\n", i + 1,
417 hub->desc.DeviceRemovable[(i + 1) / 8] & \
418 (1 << ((i + 1) % 8)) ? " not" : "");
420 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
421 debug("usb_hub_configure: failed to get Status - " \
422 "too long: %d\n", descriptor->bLength);
426 if (usb_get_hub_status(dev, buffer) < 0) {
427 debug("usb_hub_configure: failed to get Status %lX\n",
433 hubsts = (struct usb_hub_status *)buffer;
436 debug("get_hub_status returned status %X, change %X\n",
437 le16_to_cpu(hubsts->wHubStatus),
438 le16_to_cpu(hubsts->wHubChange));
439 debug("local power source is %s\n",
440 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
441 "lost (inactive)" : "good");
442 debug("%sover-current condition exists\n",
443 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
445 usb_hub_power_on(hub);
447 for (i = 0; i < dev->maxchild; i++) {
448 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
449 unsigned short portstatus, portchange;
451 ulong start = get_timer(0);
454 * Wait for (whichever finishes first)
455 * - A maximum of 10 seconds
456 * This is a purely observational value driven by connecting
457 * a few broken pen drives and taking the max * 1.5 approach
458 * - connection_change and connection state to report same
462 ret = usb_get_port_status(dev, i + 1, portsts);
464 debug("get_port_status failed\n");
468 portstatus = le16_to_cpu(portsts->wPortStatus);
469 portchange = le16_to_cpu(portsts->wPortChange);
471 if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
472 (portstatus & USB_PORT_STAT_CONNECTION))
475 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
480 debug("Port %d Status %X Change %X\n",
481 i + 1, portstatus, portchange);
483 if (portchange & USB_PORT_STAT_C_CONNECTION) {
484 debug("port %d connection change\n", i + 1);
485 usb_hub_port_connect_change(dev, i);
487 if (portchange & USB_PORT_STAT_C_ENABLE) {
488 debug("port %d enable change, status %x\n",
490 usb_clear_port_feature(dev, i + 1,
491 USB_PORT_FEAT_C_ENABLE);
493 * The following hack causes a ghost device problem
496 #ifndef CONFIG_USB_EHCI_FARADAY
497 /* EM interference sometimes causes bad shielded USB
498 * devices to be shutdown by the hub, this hack enables
499 * them again. Works at least with mouse driver */
500 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
501 (portstatus & USB_PORT_STAT_CONNECTION) &&
502 ((dev->children[i]))) {
503 debug("already running port %i " \
504 "disabled by hub (EMI?), " \
505 "re-enabling...\n", i + 1);
506 usb_hub_port_connect_change(dev, i);
510 if (portstatus & USB_PORT_STAT_SUSPEND) {
511 debug("port %d suspend change\n", i + 1);
512 usb_clear_port_feature(dev, i + 1,
513 USB_PORT_FEAT_SUSPEND);
516 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
517 debug("port %d over-current change\n", i + 1);
518 usb_clear_port_feature(dev, i + 1,
519 USB_PORT_FEAT_C_OVER_CURRENT);
520 usb_hub_power_on(hub);
523 if (portchange & USB_PORT_STAT_C_RESET) {
524 debug("port %d reset change\n", i + 1);
525 usb_clear_port_feature(dev, i + 1,
526 USB_PORT_FEAT_C_RESET);
528 } /* end for i all ports */
533 int usb_hub_probe(struct usb_device *dev, int ifnum)
535 struct usb_interface *iface;
536 struct usb_endpoint_descriptor *ep;
539 iface = &dev->config.if_desc[ifnum];
541 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
543 /* Some hubs have a subclass of 1, which AFAICT according to the */
544 /* specs is not defined, but it works */
545 if ((iface->desc.bInterfaceSubClass != 0) &&
546 (iface->desc.bInterfaceSubClass != 1))
548 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
549 if (iface->desc.bNumEndpoints != 1)
551 ep = &iface->ep_desc[0];
552 /* Output endpoint? Curiousier and curiousier.. */
553 if (!(ep->bEndpointAddress & USB_DIR_IN))
555 /* If it's not an interrupt endpoint, we'd better punt! */
556 if ((ep->bmAttributes & 3) != 3)
559 debug("USB hub found\n");
560 ret = usb_hub_configure(dev);