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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         const char *env;
90
91         dev = hub->pusb_dev;
92
93         debug("enabling power on all ports\n");
94         for (i = 0; i < dev->maxchild; i++) {
95                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
96                 debug("port %d returns %lX\n", i + 1, dev->status);
97         }
98
99         /*
100          * Wait for power to become stable,
101          * plus spec-defined max time for device to connect
102          * but allow this time to be increased via env variable as some
103          * devices break the spec and require longer warm-up times
104          */
105         env = getenv("usb_pgood_delay");
106         if (env)
107                 pgood_delay = max(pgood_delay,
108                                   (unsigned)simple_strtol(env, NULL, 0));
109         debug("pgood_delay=%dms\n", pgood_delay);
110         mdelay(pgood_delay + 1000);
111 }
112
113 void usb_hub_reset(void)
114 {
115         usb_hub_index = 0;
116 }
117
118 static struct usb_hub_device *usb_hub_allocate(void)
119 {
120         if (usb_hub_index < USB_MAX_HUB)
121                 return &hub_dev[usb_hub_index++];
122
123         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
124         return NULL;
125 }
126
127 #define MAX_TRIES 5
128
129 static inline char *portspeed(int portstatus)
130 {
131         char *speed_str;
132
133         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
134         case USB_PORT_STAT_SUPER_SPEED:
135                 speed_str = "5 Gb/s";
136                 break;
137         case USB_PORT_STAT_HIGH_SPEED:
138                 speed_str = "480 Mb/s";
139                 break;
140         case USB_PORT_STAT_LOW_SPEED:
141                 speed_str = "1.5 Mb/s";
142                 break;
143         default:
144                 speed_str = "12 Mb/s";
145                 break;
146         }
147
148         return speed_str;
149 }
150
151 int hub_port_reset(struct usb_device *dev, int port,
152                         unsigned short *portstat)
153 {
154         int tries;
155         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
156         unsigned short portstatus, portchange;
157
158         debug("hub_port_reset: resetting port %d...\n", port);
159         for (tries = 0; tries < MAX_TRIES; tries++) {
160
161                 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
162                 mdelay(200);
163
164                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
165                         debug("get_port_status failed status %lX\n",
166                               dev->status);
167                         return -1;
168                 }
169                 portstatus = le16_to_cpu(portsts->wPortStatus);
170                 portchange = le16_to_cpu(portsts->wPortChange);
171
172                 debug("portstatus %x, change %x, %s\n", portstatus, portchange,
173                                                         portspeed(portstatus));
174
175                 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
176                       "  USB_PORT_STAT_ENABLE %d\n",
177                       (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
178                       (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
179                       (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
180
181                 /*
182                  * Perhaps we should check for the following here:
183                  * - C_CONNECTION hasn't been set.
184                  * - CONNECTION is still set.
185                  *
186                  * Doing so would ensure that the device is still connected
187                  * to the bus, and hasn't been unplugged or replaced while the
188                  * USB bus reset was going on.
189                  *
190                  * However, if we do that, then (at least) a San Disk Ultra
191                  * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
192                  * Tegra Jetson TK1 board. For some reason, the device appears
193                  * to briefly drop off the bus when this second bus reset is
194                  * executed, yet if we retry this loop, it'll eventually come
195                  * back after another reset or two.
196                  */
197
198                 if (portstatus & USB_PORT_STAT_ENABLE)
199                         break;
200
201                 mdelay(200);
202         }
203
204         if (tries == MAX_TRIES) {
205                 debug("Cannot enable port %i after %i retries, " \
206                       "disabling port.\n", port + 1, MAX_TRIES);
207                 debug("Maybe the USB cable is bad?\n");
208                 return -1;
209         }
210
211         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
212         *portstat = portstatus;
213         return 0;
214 }
215
216
217 void usb_hub_port_connect_change(struct usb_device *dev, int port)
218 {
219         struct usb_device *usb;
220         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
221         unsigned short portstatus;
222
223         /* Check status */
224         if (usb_get_port_status(dev, port + 1, portsts) < 0) {
225                 debug("get_port_status failed\n");
226                 return;
227         }
228
229         portstatus = le16_to_cpu(portsts->wPortStatus);
230         debug("portstatus %x, change %x, %s\n",
231               portstatus,
232               le16_to_cpu(portsts->wPortChange),
233               portspeed(portstatus));
234
235         /* Clear the connection change status */
236         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
237
238         /* Disconnect any existing devices under this port */
239         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
240              (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
241                 debug("usb_disconnect(&hub->children[port]);\n");
242                 /* Return now if nothing is connected */
243                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
244                         return;
245         }
246         mdelay(200);
247
248         /* Reset the port */
249         if (hub_port_reset(dev, port, &portstatus) < 0) {
250                 printf("cannot reset port %i!?\n", port + 1);
251                 return;
252         }
253
254         mdelay(200);
255
256         /* Allocate a new device struct for it */
257         usb = usb_alloc_new_device(dev->controller);
258
259         switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
260         case USB_PORT_STAT_SUPER_SPEED:
261                 usb->speed = USB_SPEED_SUPER;
262                 break;
263         case USB_PORT_STAT_HIGH_SPEED:
264                 usb->speed = USB_SPEED_HIGH;
265                 break;
266         case USB_PORT_STAT_LOW_SPEED:
267                 usb->speed = USB_SPEED_LOW;
268                 break;
269         default:
270                 usb->speed = USB_SPEED_FULL;
271                 break;
272         }
273
274         dev->children[port] = usb;
275         usb->parent = dev;
276         usb->portnr = port + 1;
277         /* Run it through the hoops (find a driver, etc) */
278         if (usb_new_device(usb)) {
279                 /* Woops, disable the port */
280                 usb_free_device();
281                 dev->children[port] = NULL;
282                 debug("hub: disabling port %d\n", port + 1);
283                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
284         }
285 }
286
287
288 static int usb_hub_configure(struct usb_device *dev)
289 {
290         int i, length;
291         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
292         unsigned char *bitmap;
293         short hubCharacteristics;
294         struct usb_hub_descriptor *descriptor;
295         struct usb_hub_device *hub;
296         __maybe_unused struct usb_hub_status *hubsts;
297
298         /* "allocate" Hub device */
299         hub = usb_hub_allocate();
300         if (hub == NULL)
301                 return -1;
302         hub->pusb_dev = dev;
303         /* Get the the hub descriptor */
304         if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
305                 debug("usb_hub_configure: failed to get hub " \
306                       "descriptor, giving up %lX\n", dev->status);
307                 return -1;
308         }
309         descriptor = (struct usb_hub_descriptor *)buffer;
310
311         length = min_t(int, descriptor->bLength,
312                        sizeof(struct usb_hub_descriptor));
313
314         if (usb_get_hub_descriptor(dev, buffer, length) < 0) {
315                 debug("usb_hub_configure: failed to get hub " \
316                       "descriptor 2nd giving up %lX\n", dev->status);
317                 return -1;
318         }
319         memcpy((unsigned char *)&hub->desc, buffer, length);
320         /* adjust 16bit values */
321         put_unaligned(le16_to_cpu(get_unaligned(
322                         &descriptor->wHubCharacteristics)),
323                         &hub->desc.wHubCharacteristics);
324         /* set the bitmap */
325         bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
326         /* devices not removable by default */
327         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
328         bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
329         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
330
331         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
332                 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
333
334         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
335                 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
336
337         dev->maxchild = descriptor->bNbrPorts;
338         debug("%d ports detected\n", dev->maxchild);
339
340         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
341         switch (hubCharacteristics & HUB_CHAR_LPSM) {
342         case 0x00:
343                 debug("ganged power switching\n");
344                 break;
345         case 0x01:
346                 debug("individual port power switching\n");
347                 break;
348         case 0x02:
349         case 0x03:
350                 debug("unknown reserved power switching mode\n");
351                 break;
352         }
353
354         if (hubCharacteristics & HUB_CHAR_COMPOUND)
355                 debug("part of a compound device\n");
356         else
357                 debug("standalone hub\n");
358
359         switch (hubCharacteristics & HUB_CHAR_OCPM) {
360         case 0x00:
361                 debug("global over-current protection\n");
362                 break;
363         case 0x08:
364                 debug("individual port over-current protection\n");
365                 break;
366         case 0x10:
367         case 0x18:
368                 debug("no over-current protection\n");
369                 break;
370         }
371
372         debug("power on to power good time: %dms\n",
373               descriptor->bPwrOn2PwrGood * 2);
374         debug("hub controller current requirement: %dmA\n",
375               descriptor->bHubContrCurrent);
376
377         for (i = 0; i < dev->maxchild; i++)
378                 debug("port %d is%s removable\n", i + 1,
379                       hub->desc.DeviceRemovable[(i + 1) / 8] & \
380                       (1 << ((i + 1) % 8)) ? " not" : "");
381
382         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
383                 debug("usb_hub_configure: failed to get Status - " \
384                       "too long: %d\n", descriptor->bLength);
385                 return -1;
386         }
387
388         if (usb_get_hub_status(dev, buffer) < 0) {
389                 debug("usb_hub_configure: failed to get Status %lX\n",
390                       dev->status);
391                 return -1;
392         }
393
394 #ifdef DEBUG
395         hubsts = (struct usb_hub_status *)buffer;
396 #endif
397
398         debug("get_hub_status returned status %X, change %X\n",
399               le16_to_cpu(hubsts->wHubStatus),
400               le16_to_cpu(hubsts->wHubChange));
401         debug("local power source is %s\n",
402               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
403               "lost (inactive)" : "good");
404         debug("%sover-current condition exists\n",
405               (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
406               "" : "no ");
407         usb_hub_power_on(hub);
408
409         /*
410          * Reset any devices that may be in a bad state when applying
411          * the power.  This is a __weak function.  Resetting of the devices
412          * should occur in the board file of the device.
413          */
414         for (i = 0; i < dev->maxchild; i++)
415                 usb_hub_reset_devices(i + 1);
416
417         for (i = 0; i < dev->maxchild; i++) {
418                 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
419                 unsigned short portstatus, portchange;
420                 int ret;
421                 ulong start = get_timer(0);
422
423                 /*
424                  * Wait for (whichever finishes first)
425                  *  - A maximum of 10 seconds
426                  *    This is a purely observational value driven by connecting
427                  *    a few broken pen drives and taking the max * 1.5 approach
428                  *  - connection_change and connection state to report same
429                  *    state
430                  */
431                 do {
432                         ret = usb_get_port_status(dev, i + 1, portsts);
433                         if (ret < 0) {
434                                 debug("get_port_status failed\n");
435                                 break;
436                         }
437
438                         portstatus = le16_to_cpu(portsts->wPortStatus);
439                         portchange = le16_to_cpu(portsts->wPortChange);
440
441                         if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
442                                 (portstatus & USB_PORT_STAT_CONNECTION))
443                                 break;
444
445                 } while (get_timer(start) < CONFIG_SYS_HZ * 10);
446
447                 if (ret < 0)
448                         continue;
449
450                 debug("Port %d Status %X Change %X\n",
451                       i + 1, portstatus, portchange);
452
453                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
454                         debug("port %d connection change\n", i + 1);
455                         usb_hub_port_connect_change(dev, i);
456                 }
457                 if (portchange & USB_PORT_STAT_C_ENABLE) {
458                         debug("port %d enable change, status %x\n",
459                               i + 1, portstatus);
460                         usb_clear_port_feature(dev, i + 1,
461                                                 USB_PORT_FEAT_C_ENABLE);
462                         /*
463                          * The following hack causes a ghost device problem
464                          * to Faraday EHCI
465                          */
466 #ifndef CONFIG_USB_EHCI_FARADAY
467                         /* EM interference sometimes causes bad shielded USB
468                          * devices to be shutdown by the hub, this hack enables
469                          * them again. Works at least with mouse driver */
470                         if (!(portstatus & USB_PORT_STAT_ENABLE) &&
471                              (portstatus & USB_PORT_STAT_CONNECTION) &&
472                              ((dev->children[i]))) {
473                                 debug("already running port %i "  \
474                                       "disabled by hub (EMI?), " \
475                                       "re-enabling...\n", i + 1);
476                                       usb_hub_port_connect_change(dev, i);
477                         }
478 #endif
479                 }
480                 if (portstatus & USB_PORT_STAT_SUSPEND) {
481                         debug("port %d suspend change\n", i + 1);
482                         usb_clear_port_feature(dev, i + 1,
483                                                 USB_PORT_FEAT_SUSPEND);
484                 }
485
486                 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
487                         debug("port %d over-current change\n", i + 1);
488                         usb_clear_port_feature(dev, i + 1,
489                                                 USB_PORT_FEAT_C_OVER_CURRENT);
490                         usb_hub_power_on(hub);
491                 }
492
493                 if (portchange & USB_PORT_STAT_C_RESET) {
494                         debug("port %d reset change\n", i + 1);
495                         usb_clear_port_feature(dev, i + 1,
496                                                 USB_PORT_FEAT_C_RESET);
497                 }
498         } /* end for i all ports */
499
500         return 0;
501 }
502
503 int usb_hub_probe(struct usb_device *dev, int ifnum)
504 {
505         struct usb_interface *iface;
506         struct usb_endpoint_descriptor *ep;
507         int ret;
508
509         iface = &dev->config.if_desc[ifnum];
510         /* Is it a hub? */
511         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
512                 return 0;
513         /* Some hubs have a subclass of 1, which AFAICT according to the */
514         /*  specs is not defined, but it works */
515         if ((iface->desc.bInterfaceSubClass != 0) &&
516             (iface->desc.bInterfaceSubClass != 1))
517                 return 0;
518         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
519         if (iface->desc.bNumEndpoints != 1)
520                 return 0;
521         ep = &iface->ep_desc[0];
522         /* Output endpoint? Curiousier and curiousier.. */
523         if (!(ep->bEndpointAddress & USB_DIR_IN))
524                 return 0;
525         /* If it's not an interrupt endpoint, we'd better punt! */
526         if ((ep->bmAttributes & 3) != 3)
527                 return 0;
528         /* We found a hub */
529         debug("USB hub found\n");
530         ret = usb_hub_configure(dev);
531         return ret;
532 }