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;
92 debug("enabling power on all ports\n");
93 for (i = 0; i < dev->maxchild; i++) {
94 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
95 debug("port %d returns %lX\n", i + 1, dev->status);
99 * Wait for power to become stable,
100 * plus spec-defined max time for device to connect
102 mdelay(pgood_delay + 1000);
105 void usb_hub_reset(void)
110 static struct usb_hub_device *usb_hub_allocate(void)
112 if (usb_hub_index < USB_MAX_HUB)
113 return &hub_dev[usb_hub_index++];
115 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
121 static inline char *portspeed(int portstatus)
125 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
126 case USB_PORT_STAT_SUPER_SPEED:
127 speed_str = "5 Gb/s";
129 case USB_PORT_STAT_HIGH_SPEED:
130 speed_str = "480 Mb/s";
132 case USB_PORT_STAT_LOW_SPEED:
133 speed_str = "1.5 Mb/s";
136 speed_str = "12 Mb/s";
143 int hub_port_reset(struct usb_device *dev, int port,
144 unsigned short *portstat)
147 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
148 unsigned short portstatus, portchange;
150 debug("hub_port_reset: resetting port %d...\n", port);
151 for (tries = 0; tries < MAX_TRIES; tries++) {
153 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
156 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
157 debug("get_port_status failed status %lX\n",
161 portstatus = le16_to_cpu(portsts->wPortStatus);
162 portchange = le16_to_cpu(portsts->wPortChange);
164 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
165 portspeed(portstatus));
167 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
168 " USB_PORT_STAT_ENABLE %d\n",
169 (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
170 (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
171 (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
174 * Perhaps we should check for the following here:
175 * - C_CONNECTION hasn't been set.
176 * - CONNECTION is still set.
178 * Doing so would ensure that the device is still connected
179 * to the bus, and hasn't been unplugged or replaced while the
180 * USB bus reset was going on.
182 * However, if we do that, then (at least) a San Disk Ultra
183 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
184 * Tegra Jetson TK1 board. For some reason, the device appears
185 * to briefly drop off the bus when this second bus reset is
186 * executed, yet if we retry this loop, it'll eventually come
187 * back after another reset or two.
190 if (portstatus & USB_PORT_STAT_ENABLE)
196 if (tries == MAX_TRIES) {
197 debug("Cannot enable port %i after %i retries, " \
198 "disabling port.\n", port + 1, MAX_TRIES);
199 debug("Maybe the USB cable is bad?\n");
203 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
204 *portstat = portstatus;
209 void usb_hub_port_connect_change(struct usb_device *dev, int port)
211 struct usb_device *usb;
212 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
213 unsigned short portstatus;
216 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
217 debug("get_port_status failed\n");
221 portstatus = le16_to_cpu(portsts->wPortStatus);
222 debug("portstatus %x, change %x, %s\n",
224 le16_to_cpu(portsts->wPortChange),
225 portspeed(portstatus));
227 /* Clear the connection change status */
228 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
230 /* Disconnect any existing devices under this port */
231 if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
232 (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
233 debug("usb_disconnect(&hub->children[port]);\n");
234 /* Return now if nothing is connected */
235 if (!(portstatus & USB_PORT_STAT_CONNECTION))
241 if (hub_port_reset(dev, port, &portstatus) < 0) {
242 printf("cannot reset port %i!?\n", port + 1);
248 /* Allocate a new device struct for it */
249 usb = usb_alloc_new_device(dev->controller);
251 switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
252 case USB_PORT_STAT_SUPER_SPEED:
253 usb->speed = USB_SPEED_SUPER;
255 case USB_PORT_STAT_HIGH_SPEED:
256 usb->speed = USB_SPEED_HIGH;
258 case USB_PORT_STAT_LOW_SPEED:
259 usb->speed = USB_SPEED_LOW;
262 usb->speed = USB_SPEED_FULL;
266 dev->children[port] = usb;
268 usb->portnr = port + 1;
269 /* Run it through the hoops (find a driver, etc) */
270 if (usb_new_device(usb)) {
271 /* Woops, disable the port */
273 dev->children[port] = NULL;
274 debug("hub: disabling port %d\n", port + 1);
275 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
280 static int usb_hub_configure(struct usb_device *dev)
283 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
284 unsigned char *bitmap;
285 short hubCharacteristics;
286 struct usb_hub_descriptor *descriptor;
287 struct usb_hub_device *hub;
288 __maybe_unused struct usb_hub_status *hubsts;
290 /* "allocate" Hub device */
291 hub = usb_hub_allocate();
295 /* Get the the hub descriptor */
296 if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
297 debug("usb_hub_configure: failed to get hub " \
298 "descriptor, giving up %lX\n", dev->status);
301 descriptor = (struct usb_hub_descriptor *)buffer;
303 length = min_t(int, descriptor->bLength,
304 sizeof(struct usb_hub_descriptor));
306 if (usb_get_hub_descriptor(dev, buffer, length) < 0) {
307 debug("usb_hub_configure: failed to get hub " \
308 "descriptor 2nd giving up %lX\n", dev->status);
311 memcpy((unsigned char *)&hub->desc, buffer, length);
312 /* adjust 16bit values */
313 put_unaligned(le16_to_cpu(get_unaligned(
314 &descriptor->wHubCharacteristics)),
315 &hub->desc.wHubCharacteristics);
317 bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
318 /* devices not removable by default */
319 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
320 bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
321 memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
323 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
324 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
326 for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
327 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
329 dev->maxchild = descriptor->bNbrPorts;
330 debug("%d ports detected\n", dev->maxchild);
332 hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
333 switch (hubCharacteristics & HUB_CHAR_LPSM) {
335 debug("ganged power switching\n");
338 debug("individual port power switching\n");
342 debug("unknown reserved power switching mode\n");
346 if (hubCharacteristics & HUB_CHAR_COMPOUND)
347 debug("part of a compound device\n");
349 debug("standalone hub\n");
351 switch (hubCharacteristics & HUB_CHAR_OCPM) {
353 debug("global over-current protection\n");
356 debug("individual port over-current protection\n");
360 debug("no over-current protection\n");
364 debug("power on to power good time: %dms\n",
365 descriptor->bPwrOn2PwrGood * 2);
366 debug("hub controller current requirement: %dmA\n",
367 descriptor->bHubContrCurrent);
369 for (i = 0; i < dev->maxchild; i++)
370 debug("port %d is%s removable\n", i + 1,
371 hub->desc.DeviceRemovable[(i + 1) / 8] & \
372 (1 << ((i + 1) % 8)) ? " not" : "");
374 if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
375 debug("usb_hub_configure: failed to get Status - " \
376 "too long: %d\n", descriptor->bLength);
380 if (usb_get_hub_status(dev, buffer) < 0) {
381 debug("usb_hub_configure: failed to get Status %lX\n",
387 hubsts = (struct usb_hub_status *)buffer;
390 debug("get_hub_status returned status %X, change %X\n",
391 le16_to_cpu(hubsts->wHubStatus),
392 le16_to_cpu(hubsts->wHubChange));
393 debug("local power source is %s\n",
394 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
395 "lost (inactive)" : "good");
396 debug("%sover-current condition exists\n",
397 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
399 usb_hub_power_on(hub);
402 * Reset any devices that may be in a bad state when applying
403 * the power. This is a __weak function. Resetting of the devices
404 * should occur in the board file of the device.
406 for (i = 0; i < dev->maxchild; i++)
407 usb_hub_reset_devices(i + 1);
409 for (i = 0; i < dev->maxchild; i++) {
410 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
411 unsigned short portstatus, portchange;
413 ulong start = get_timer(0);
416 * Wait for (whichever finishes first)
417 * - A maximum of 10 seconds
418 * This is a purely observational value driven by connecting
419 * a few broken pen drives and taking the max * 1.5 approach
420 * - connection_change and connection state to report same
424 ret = usb_get_port_status(dev, i + 1, portsts);
426 debug("get_port_status failed\n");
430 portstatus = le16_to_cpu(portsts->wPortStatus);
431 portchange = le16_to_cpu(portsts->wPortChange);
433 if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
434 (portstatus & USB_PORT_STAT_CONNECTION))
437 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
442 debug("Port %d Status %X Change %X\n",
443 i + 1, portstatus, portchange);
445 if (portchange & USB_PORT_STAT_C_CONNECTION) {
446 debug("port %d connection change\n", i + 1);
447 usb_hub_port_connect_change(dev, i);
449 if (portchange & USB_PORT_STAT_C_ENABLE) {
450 debug("port %d enable change, status %x\n",
452 usb_clear_port_feature(dev, i + 1,
453 USB_PORT_FEAT_C_ENABLE);
455 * The following hack causes a ghost device problem
458 #ifndef CONFIG_USB_EHCI_FARADAY
459 /* EM interference sometimes causes bad shielded USB
460 * devices to be shutdown by the hub, this hack enables
461 * them again. Works at least with mouse driver */
462 if (!(portstatus & USB_PORT_STAT_ENABLE) &&
463 (portstatus & USB_PORT_STAT_CONNECTION) &&
464 ((dev->children[i]))) {
465 debug("already running port %i " \
466 "disabled by hub (EMI?), " \
467 "re-enabling...\n", i + 1);
468 usb_hub_port_connect_change(dev, i);
472 if (portstatus & USB_PORT_STAT_SUSPEND) {
473 debug("port %d suspend change\n", i + 1);
474 usb_clear_port_feature(dev, i + 1,
475 USB_PORT_FEAT_SUSPEND);
478 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
479 debug("port %d over-current change\n", i + 1);
480 usb_clear_port_feature(dev, i + 1,
481 USB_PORT_FEAT_C_OVER_CURRENT);
482 usb_hub_power_on(hub);
485 if (portchange & USB_PORT_STAT_C_RESET) {
486 debug("port %d reset change\n", i + 1);
487 usb_clear_port_feature(dev, i + 1,
488 USB_PORT_FEAT_C_RESET);
490 } /* end for i all ports */
495 int usb_hub_probe(struct usb_device *dev, int ifnum)
497 struct usb_interface *iface;
498 struct usb_endpoint_descriptor *ep;
501 iface = &dev->config.if_desc[ifnum];
503 if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
505 /* Some hubs have a subclass of 1, which AFAICT according to the */
506 /* specs is not defined, but it works */
507 if ((iface->desc.bInterfaceSubClass != 0) &&
508 (iface->desc.bInterfaceSubClass != 1))
510 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
511 if (iface->desc.bNumEndpoints != 1)
513 ep = &iface->ep_desc[0];
514 /* Output endpoint? Curiousier and curiousier.. */
515 if (!(ep->bEndpointAddress & USB_DIR_IN))
517 /* If it's not an interrupt endpoint, we'd better punt! */
518 if ((ep->bmAttributes & 3) != 3)
521 debug("USB hub found\n");
522 ret = usb_hub_configure(dev);