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[u-boot] / common / usb_hub.c
1 /*
2  * Most of this source has been derived from the Linux USB
3  * project:
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)
13  *
14  * Adapted for U-Boot:
15  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
16  *
17  * SPDX-License-Identifier:     GPL-2.0+
18  */
19
20 /****************************************************************************
21  * HUB "Driver"
22  * Probes device for being a hub and configurate it
23  */
24
25 #include <common.h>
26 #include <command.h>
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>
32
33 #include <usb.h>
34 #ifdef CONFIG_4xx
35 #include <asm/4xx_pci.h>
36 #endif
37
38 #define USB_BUFSIZ      512
39
40 static struct usb_hub_device hub_dev[USB_MAX_HUB];
41 static int usb_hub_index;
42
43 __weak void usb_hub_reset_devices(int port)
44 {
45         return;
46 }
47
48 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
49 {
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);
53 }
54
55 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
56 {
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);
60 }
61
62 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
63 {
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);
67 }
68
69 static int usb_get_hub_status(struct usb_device *dev, void *data)
70 {
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);
74 }
75
76 static int usb_get_port_status(struct usb_device *dev, int port, void *data)
77 {
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);
81 }
82
83
84 static void usb_hub_power_on(struct usb_hub_device *hub)
85 {
86         int i;
87         struct usb_device *dev;
88         unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
89
90         dev = hub->pusb_dev;
91
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);
96         }
97
98         /*
99          * Wait for power to become stable,
100          * plus spec-defined max time for device to connect
101          */
102         mdelay(pgood_delay + 1000);
103 }
104
105 void usb_hub_reset(void)
106 {
107         usb_hub_index = 0;
108 }
109
110 static struct usb_hub_device *usb_hub_allocate(void)
111 {
112         if (usb_hub_index < USB_MAX_HUB)
113                 return &hub_dev[usb_hub_index++];
114
115         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
116         return NULL;
117 }
118
119 #define MAX_TRIES 5
120
121 static inline char *portspeed(int portstatus)
122 {
123         char *speed_str;
124
125         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
126         case USB_PORT_STAT_SUPER_SPEED:
127                 speed_str = "5 Gb/s";
128                 break;
129         case USB_PORT_STAT_HIGH_SPEED:
130                 speed_str = "480 Mb/s";
131                 break;
132         case USB_PORT_STAT_LOW_SPEED:
133                 speed_str = "1.5 Mb/s";
134                 break;
135         default:
136                 speed_str = "12 Mb/s";
137                 break;
138         }
139
140         return speed_str;
141 }
142
143 int hub_port_reset(struct usb_device *dev, int port,
144                         unsigned short *portstat)
145 {
146         int tries;
147         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
148         unsigned short portstatus, portchange;
149
150         debug("hub_port_reset: resetting port %d...\n", port);
151         for (tries = 0; tries < MAX_TRIES; tries++) {
152
153                 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
154                 mdelay(200);
155
156                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
157                         debug("get_port_status failed status %lX\n",
158                               dev->status);
159                         return -1;
160                 }
161                 portstatus = le16_to_cpu(portsts->wPortStatus);
162                 portchange = le16_to_cpu(portsts->wPortChange);
163
164                 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
165                                                         portspeed(portstatus));
166
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);
172
173                 /*
174                  * Perhaps we should check for the following here:
175                  * - C_CONNECTION hasn't been set.
176                  * - CONNECTION is still set.
177                  *
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.
181                  *
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.
188                  */
189
190                 if (portstatus & USB_PORT_STAT_ENABLE)
191                         break;
192
193                 mdelay(200);
194         }
195
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");
200                 return -1;
201         }
202
203         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
204         *portstat = portstatus;
205         return 0;
206 }
207
208
209 void usb_hub_port_connect_change(struct usb_device *dev, int port)
210 {
211         struct usb_device *usb;
212         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
213         unsigned short portstatus;
214
215         /* Check status */
216         if (usb_get_port_status(dev, port + 1, portsts) < 0) {
217                 debug("get_port_status failed\n");
218                 return;
219         }
220
221         portstatus = le16_to_cpu(portsts->wPortStatus);
222         debug("portstatus %x, change %x, %s\n",
223               portstatus,
224               le16_to_cpu(portsts->wPortChange),
225               portspeed(portstatus));
226
227         /* Clear the connection change status */
228         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
229
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))
236                         return;
237         }
238         mdelay(200);
239
240         /* Reset the port */
241         if (hub_port_reset(dev, port, &portstatus) < 0) {
242                 printf("cannot reset port %i!?\n", port + 1);
243                 return;
244         }
245
246         mdelay(200);
247
248         /* Allocate a new device struct for it */
249         usb = usb_alloc_new_device(dev->controller);
250
251         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
252         case USB_PORT_STAT_SUPER_SPEED:
253                 usb->speed = USB_SPEED_SUPER;
254                 break;
255         case USB_PORT_STAT_HIGH_SPEED:
256                 usb->speed = USB_SPEED_HIGH;
257                 break;
258         case USB_PORT_STAT_LOW_SPEED:
259                 usb->speed = USB_SPEED_LOW;
260                 break;
261         default:
262                 usb->speed = USB_SPEED_FULL;
263                 break;
264         }
265
266         dev->children[port] = usb;
267         usb->parent = dev;
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 */
272                 usb_free_device();
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);
276         }
277 }
278
279
280 static int usb_hub_configure(struct usb_device *dev)
281 {
282         int i, length;
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;
289
290         /* "allocate" Hub device */
291         hub = usb_hub_allocate();
292         if (hub == NULL)
293                 return -1;
294         hub->pusb_dev = dev;
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);
299                 return -1;
300         }
301         descriptor = (struct usb_hub_descriptor *)buffer;
302
303         length = min_t(int, descriptor->bLength,
304                        sizeof(struct usb_hub_descriptor));
305
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);
309                 return -1;
310         }
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);
316         /* set the bitmap */
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 */
322
323         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
324                 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
325
326         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
327                 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
328
329         dev->maxchild = descriptor->bNbrPorts;
330         debug("%d ports detected\n", dev->maxchild);
331
332         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
333         switch (hubCharacteristics & HUB_CHAR_LPSM) {
334         case 0x00:
335                 debug("ganged power switching\n");
336                 break;
337         case 0x01:
338                 debug("individual port power switching\n");
339                 break;
340         case 0x02:
341         case 0x03:
342                 debug("unknown reserved power switching mode\n");
343                 break;
344         }
345
346         if (hubCharacteristics & HUB_CHAR_COMPOUND)
347                 debug("part of a compound device\n");
348         else
349                 debug("standalone hub\n");
350
351         switch (hubCharacteristics & HUB_CHAR_OCPM) {
352         case 0x00:
353                 debug("global over-current protection\n");
354                 break;
355         case 0x08:
356                 debug("individual port over-current protection\n");
357                 break;
358         case 0x10:
359         case 0x18:
360                 debug("no over-current protection\n");
361                 break;
362         }
363
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);
368
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" : "");
373
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);
377                 return -1;
378         }
379
380         if (usb_get_hub_status(dev, buffer) < 0) {
381                 debug("usb_hub_configure: failed to get Status %lX\n",
382                       dev->status);
383                 return -1;
384         }
385
386 #ifdef DEBUG
387         hubsts = (struct usb_hub_status *)buffer;
388 #endif
389
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) ? \
398               "" : "no ");
399         usb_hub_power_on(hub);
400
401         /*
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.
405          */
406         for (i = 0; i < dev->maxchild; i++)
407                 usb_hub_reset_devices(i + 1);
408
409         for (i = 0; i < dev->maxchild; i++) {
410                 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
411                 unsigned short portstatus, portchange;
412                 int ret;
413                 ulong start = get_timer(0);
414
415                 /*
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
421                  *    state
422                  */
423                 do {
424                         ret = usb_get_port_status(dev, i + 1, portsts);
425                         if (ret < 0) {
426                                 debug("get_port_status failed\n");
427                                 break;
428                         }
429
430                         portstatus = le16_to_cpu(portsts->wPortStatus);
431                         portchange = le16_to_cpu(portsts->wPortChange);
432
433                         if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
434                                 (portstatus & USB_PORT_STAT_CONNECTION))
435                                 break;
436
437                 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
438
439                 if (ret < 0)
440                         continue;
441
442                 debug("Port %d Status %X Change %X\n",
443                       i + 1, portstatus, portchange);
444
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);
448                 }
449                 if (portchange & USB_PORT_STAT_C_ENABLE) {
450                         debug("port %d enable change, status %x\n",
451                               i + 1, portstatus);
452                         usb_clear_port_feature(dev, i + 1,
453                                                 USB_PORT_FEAT_C_ENABLE);
454                         /*
455                          * The following hack causes a ghost device problem
456                          * to Faraday EHCI
457                          */
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);
469                         }
470 #endif
471                 }
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);
476                 }
477
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);
483                 }
484
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);
489                 }
490         } /* end for i all ports */
491
492         return 0;
493 }
494
495 int usb_hub_probe(struct usb_device *dev, int ifnum)
496 {
497         struct usb_interface *iface;
498         struct usb_endpoint_descriptor *ep;
499         int ret;
500
501         iface = &dev->config.if_desc[ifnum];
502         /* Is it a hub? */
503         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
504                 return 0;
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))
509                 return 0;
510         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
511         if (iface->desc.bNumEndpoints != 1)
512                 return 0;
513         ep = &iface->ep_desc[0];
514         /* Output endpoint? Curiousier and curiousier.. */
515         if (!(ep->bEndpointAddress & USB_DIR_IN))
516                 return 0;
517         /* If it's not an interrupt endpoint, we'd better punt! */
518         if ((ep->bmAttributes & 3) != 3)
519                 return 0;
520         /* We found a hub */
521         debug("USB hub found\n");
522         ret = usb_hub_configure(dev);
523         return ret;
524 }