common/usb_hub.c

   1 /*
   2  *
   3  * Most of this source has been derived from the Linux USB
   4  * project:
   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)
  14  *
  15  * Adapted for U-Boot:
  16  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
  17  *
  18  * See file CREDITS for list of people who contributed to this
  19  * project.
  20  *
  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.
  25  *
  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.
  30  *
  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,
  34  * MA 02111-1307 USA
  35  *
  36  */
  37
  38 /****************************************************************************
  39  * HUB "Driver"
  40  * Probes device for being a hub and configurate it
  41  */
  42
  43 #include <common.h>
  44 #include <command.h>
  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>
  50
  51 #include <usb.h>
  52 #ifdef CONFIG_4xx
  53 #include <asm/4xx_pci.h>
  54 #endif
  55
  56 #ifdef DEBUG
  57 #define USB_DEBUG       1
  58 #define USB_HUB_DEBUG   1
  59 #else
  60 #define USB_DEBUG       0
  61 #define USB_HUB_DEBUG   0
  62 #endif
  63
  64 #define USB_PRINTF(fmt, args...)        debug_cond(USB_DEBUG, fmt, ##args)
  65 #define USB_HUB_PRINTF(fmt, args...)    debug_cond(USB_HUB_DEBUG, fmt, ##args)
  66
  67 #define USB_BUFSIZ      512
  68
  69 static struct usb_hub_device hub_dev[USB_MAX_HUB];
  70 static int usb_hub_index;
  71
  72
  73 static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
  74 {
  75         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  76                 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  77                 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
  78 }
  79
  80 static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
  81 {
  82         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  83                                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
  84                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  85 }
  86
  87 static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
  88 {
  89         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  90                                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
  91                                 port, NULL, 0, USB_CNTL_TIMEOUT);
  92 }
  93
  94 static int usb_get_hub_status(struct usb_device *dev, void *data)
  95 {
  96         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  97                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
  98                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
  99 }
 100
 101 static int usb_get_port_status(struct usb_device *dev, int port, void *data)
 102 {
 103         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 104                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
 105                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
 106 }
 107
 108
 109 static void usb_hub_power_on(struct usb_hub_device *hub)
 110 {
 111         int i;
 112         struct usb_device *dev;
 113         unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
 114
 115         dev = hub->pusb_dev;
 116         /* Enable power to the ports */
 117         USB_HUB_PRINTF("enabling power on all ports\n");
 118         for (i = 0; i < dev->maxchild; i++) {
 119                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 120                 USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
 121         }
 122
 123         /* Wait at least 100 msec for power to become stable */
 124         mdelay(max(pgood_delay, (unsigned)100));
 125 }
 126
 127 void usb_hub_reset(void)
 128 {
 129         usb_hub_index = 0;
 130 }
 131
 132 static struct usb_hub_device *usb_hub_allocate(void)
 133 {
 134         if (usb_hub_index < USB_MAX_HUB)
 135                 return &hub_dev[usb_hub_index++];
 136
 137         printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
 138         return NULL;
 139 }
 140
 141 #define MAX_TRIES 5
 142
 143 static inline char *portspeed(int portstatus)
 144 {
 145         if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
 146                 return "480 Mb/s";
 147         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
 148                 return "1.5 Mb/s";
 149         else
 150                 return "12 Mb/s";
 151 }
 152
 153 int hub_port_reset(struct usb_device *dev, int port,
 154                         unsigned short *portstat)
 155 {
 156         int tries;
 157         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 158         unsigned short portstatus, portchange;
 159
 160         USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
 161         for (tries = 0; tries < MAX_TRIES; tries++) {
 162
 163                 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 164                 mdelay(200);
 165
 166                 if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 167                         USB_HUB_PRINTF("get_port_status failed status %lX\n",
 168                                         dev->status);
 169                         return -1;
 170                 }
 171                 portstatus = le16_to_cpu(portsts->wPortStatus);
 172                 portchange = le16_to_cpu(portsts->wPortChange);
 173
 174                 USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
 175                                 portstatus, portchange,
 176                                 portspeed(portstatus));
 177
 178                 USB_HUB_PRINTF("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
 179                                "  USB_PORT_STAT_ENABLE %d\n",
 180                         (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
 181                         (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
 182                         (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 183
 184                 if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
 185                     !(portstatus & USB_PORT_STAT_CONNECTION))
 186                         return -1;
 187
 188                 if (portstatus & USB_PORT_STAT_ENABLE)
 189                         break;
 190
 191                 mdelay(200);
 192         }
 193
 194         if (tries == MAX_TRIES) {
 195                 USB_HUB_PRINTF("Cannot enable port %i after %i retries, " \
 196                                 "disabling port.\n", port + 1, MAX_TRIES);
 197                 USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
 198                 return -1;
 199         }
 200
 201         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
 202         *portstat = portstatus;
 203         return 0;
 204 }
 205
 206
 207 void usb_hub_port_connect_change(struct usb_device *dev, int port)
 208 {
 209         struct usb_device *usb;
 210         ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 211         unsigned short portstatus;
 212
 213         /* Check status */
 214         if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 215                 USB_HUB_PRINTF("get_port_status failed\n");
 216                 return;
 217         }
 218
 219         portstatus = le16_to_cpu(portsts->wPortStatus);
 220         USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
 221                         portstatus,
 222                         le16_to_cpu(portsts->wPortChange),
 223                         portspeed(portstatus));
 224
 225         /* Clear the connection change status */
 226         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
 227
 228         /* Disconnect any existing devices under this port */
 229         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
 230              (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
 231                 USB_HUB_PRINTF("usb_disconnect(&hub->children[port]);\n");
 232                 /* Return now if nothing is connected */
 233                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
 234                         return;
 235         }
 236         mdelay(200);
 237
 238         /* Reset the port */
 239         if (hub_port_reset(dev, port, &portstatus) < 0) {
 240                 printf("cannot reset port %i!?\n", port + 1);
 241                 return;
 242         }
 243
 244         mdelay(200);
 245
 246         /* Allocate a new device struct for it */
 247         usb = usb_alloc_new_device();
 248
 249         if (portstatus & USB_PORT_STAT_HIGH_SPEED)
 250                 usb->speed = USB_SPEED_HIGH;
 251         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
 252                 usb->speed = USB_SPEED_LOW;
 253         else
 254                 usb->speed = USB_SPEED_FULL;
 255
 256         dev->children[port] = usb;
 257         usb->parent = dev;
 258         usb->portnr = port + 1;
 259         /* Run it through the hoops (find a driver, etc) */
 260         if (usb_new_device(usb)) {
 261                 /* Woops, disable the port */
 262                 USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
 263                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
 264         }
 265 }
 266
 267
 268 static int usb_hub_configure(struct usb_device *dev)
 269 {
 270         int i;
 271         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
 272         unsigned char *bitmap;
 273         short hubCharacteristics;
 274         struct usb_hub_descriptor *descriptor;
 275         struct usb_hub_device *hub;
 276 #ifdef USB_HUB_DEBUG
 277         struct usb_hub_status *hubsts;
 278 #endif
 279
 280         /* "allocate" Hub device */
 281         hub = usb_hub_allocate();
 282         if (hub == NULL)
 283                 return -1;
 284         hub->pusb_dev = dev;
 285         /* Get the the hub descriptor */
 286         if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
 287                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
 288                                    "descriptor, giving up %lX\n", dev->status);
 289                 return -1;
 290         }
 291         descriptor = (struct usb_hub_descriptor *)buffer;
 292
 293         /* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
 294         i = descriptor->bLength;
 295         if (i > USB_BUFSIZ) {
 296                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
 297                                 "descriptor - too long: %d\n",
 298                                 descriptor->bLength);
 299                 return -1;
 300         }
 301
 302         if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
 303                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
 304                                 "descriptor 2nd giving up %lX\n", dev->status);
 305                 return -1;
 306         }
 307         memcpy((unsigned char *)&hub->desc, buffer, descriptor->bLength);
 308         /* adjust 16bit values */
 309         put_unaligned(le16_to_cpu(get_unaligned(
 310                         &descriptor->wHubCharacteristics)),
 311                         &hub->desc.wHubCharacteristics);
 312         /* set the bitmap */
 313         bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
 314         /* devices not removable by default */
 315         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
 316         bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
 317         memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
 318
 319         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 320                 hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
 321
 322         for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
 323                 hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
 324
 325         dev->maxchild = descriptor->bNbrPorts;
 326         USB_HUB_PRINTF("%d ports detected\n", dev->maxchild);
 327
 328         hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
 329         switch (hubCharacteristics & HUB_CHAR_LPSM) {
 330         case 0x00:
 331                 USB_HUB_PRINTF("ganged power switching\n");
 332                 break;
 333         case 0x01:
 334                 USB_HUB_PRINTF("individual port power switching\n");
 335                 break;
 336         case 0x02:
 337         case 0x03:
 338                 USB_HUB_PRINTF("unknown reserved power switching mode\n");
 339                 break;
 340         }
 341
 342         if (hubCharacteristics & HUB_CHAR_COMPOUND)
 343                 USB_HUB_PRINTF("part of a compound device\n");
 344         else
 345                 USB_HUB_PRINTF("standalone hub\n");
 346
 347         switch (hubCharacteristics & HUB_CHAR_OCPM) {
 348         case 0x00:
 349                 USB_HUB_PRINTF("global over-current protection\n");
 350                 break;
 351         case 0x08:
 352                 USB_HUB_PRINTF("individual port over-current protection\n");
 353                 break;
 354         case 0x10:
 355         case 0x18:
 356                 USB_HUB_PRINTF("no over-current protection\n");
 357                 break;
 358         }
 359
 360         USB_HUB_PRINTF("power on to power good time: %dms\n",
 361                         descriptor->bPwrOn2PwrGood * 2);
 362         USB_HUB_PRINTF("hub controller current requirement: %dmA\n",
 363                         descriptor->bHubContrCurrent);
 364
 365         for (i = 0; i < dev->maxchild; i++)
 366                 USB_HUB_PRINTF("port %d is%s removable\n", i + 1,
 367                         hub->desc.DeviceRemovable[(i + 1) / 8] & \
 368                                            (1 << ((i + 1) % 8)) ? " not" : "");
 369
 370         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
 371                 USB_HUB_PRINTF("usb_hub_configure: failed to get Status - " \
 372                                 "too long: %d\n", descriptor->bLength);
 373                 return -1;
 374         }
 375
 376         if (usb_get_hub_status(dev, buffer) < 0) {
 377                 USB_HUB_PRINTF("usb_hub_configure: failed to get Status %lX\n",
 378                                 dev->status);
 379                 return -1;
 380         }
 381
 382 #ifdef USB_HUB_DEBUG
 383         hubsts = (struct usb_hub_status *)buffer;
 384 #endif
 385         USB_HUB_PRINTF("get_hub_status returned status %X, change %X\n",
 386                         le16_to_cpu(hubsts->wHubStatus),
 387                         le16_to_cpu(hubsts->wHubChange));
 388         USB_HUB_PRINTF("local power source is %s\n",
 389                 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
 390                 "lost (inactive)" : "good");
 391         USB_HUB_PRINTF("%sover-current condition exists\n",
 392                 (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
 393                 "" : "no ");
 394         usb_hub_power_on(hub);
 395
 396         for (i = 0; i < dev->maxchild; i++) {
 397                 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 398                 unsigned short portstatus, portchange;
 399
 400                 if (usb_get_port_status(dev, i + 1, portsts) < 0) {
 401                         USB_HUB_PRINTF("get_port_status failed\n");
 402                         continue;
 403                 }
 404
 405                 portstatus = le16_to_cpu(portsts->wPortStatus);
 406                 portchange = le16_to_cpu(portsts->wPortChange);
 407                 USB_HUB_PRINTF("Port %d Status %X Change %X\n",
 408                                 i + 1, portstatus, portchange);
 409
 410                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
 411                         USB_HUB_PRINTF("port %d connection change\n", i + 1);
 412                         usb_hub_port_connect_change(dev, i);
 413                 }
 414                 if (portchange & USB_PORT_STAT_C_ENABLE) {
 415                         USB_HUB_PRINTF("port %d enable change, status %x\n",
 416                                         i + 1, portstatus);
 417                         usb_clear_port_feature(dev, i + 1,
 418                                                 USB_PORT_FEAT_C_ENABLE);
 419
 420                         /* EM interference sometimes causes bad shielded USB
 421                          * devices to be shutdown by the hub, this hack enables
 422                          * them again. Works at least with mouse driver */
 423                         if (!(portstatus & USB_PORT_STAT_ENABLE) &&
 424                              (portstatus & USB_PORT_STAT_CONNECTION) &&
 425                              ((dev->children[i]))) {
 426                                 USB_HUB_PRINTF("already running port %i "  \
 427                                                 "disabled by hub (EMI?), " \
 428                                                 "re-enabling...\n", i + 1);
 429                                         usb_hub_port_connect_change(dev, i);
 430                         }
 431                 }
 432                 if (portstatus & USB_PORT_STAT_SUSPEND) {
 433                         USB_HUB_PRINTF("port %d suspend change\n", i + 1);
 434                         usb_clear_port_feature(dev, i + 1,
 435                                                 USB_PORT_FEAT_SUSPEND);
 436                 }
 437
 438                 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
 439                         USB_HUB_PRINTF("port %d over-current change\n", i + 1);
 440                         usb_clear_port_feature(dev, i + 1,
 441                                                 USB_PORT_FEAT_C_OVER_CURRENT);
 442                         usb_hub_power_on(hub);
 443                 }
 444
 445                 if (portchange & USB_PORT_STAT_C_RESET) {
 446                         USB_HUB_PRINTF("port %d reset change\n", i + 1);
 447                         usb_clear_port_feature(dev, i + 1,
 448                                                 USB_PORT_FEAT_C_RESET);
 449                 }
 450         } /* end for i all ports */
 451
 452         return 0;
 453 }
 454
 455 int usb_hub_probe(struct usb_device *dev, int ifnum)
 456 {
 457         struct usb_interface *iface;
 458         struct usb_endpoint_descriptor *ep;
 459         int ret;
 460
 461         iface = &dev->config.if_desc[ifnum];
 462         /* Is it a hub? */
 463         if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
 464                 return 0;
 465         /* Some hubs have a subclass of 1, which AFAICT according to the */
 466         /*  specs is not defined, but it works */
 467         if ((iface->desc.bInterfaceSubClass != 0) &&
 468             (iface->desc.bInterfaceSubClass != 1))
 469                 return 0;
 470         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
 471         if (iface->desc.bNumEndpoints != 1)
 472                 return 0;
 473         ep = &iface->ep_desc[0];
 474         /* Output endpoint? Curiousier and curiousier.. */
 475         if (!(ep->bEndpointAddress & USB_DIR_IN))
 476                 return 0;
 477         /* If it's not an interrupt endpoint, we'd better punt! */
 478         if ((ep->bmAttributes & 3) != 3)
 479                 return 0;
 480         /* We found a hub */
 481         USB_HUB_PRINTF("USB hub found\n");
 482         ret = usb_hub_configure(dev);
 483         return ret;
 484 }