kernel/drivers/usb/host/uhci-hub.c

   1 /*
   2  * Universal Host Controller Interface driver for USB.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * (C) Copyright 1999 Linus Torvalds
   7  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   8  * (C) Copyright 1999 Randy Dunlap
   9  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  10  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  11  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  12  * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
  13  */
  14
  15 static const __u8 root_hub_hub_des[] =
  16 {
  17         0x09,                   /*  __u8  bLength; */
  18         USB_DT_HUB,             /*  __u8  bDescriptorType; Hub-descriptor */
  19         0x02,                   /*  __u8  bNbrPorts; */
  20         HUB_CHAR_NO_LPSM |      /* __u16  wHubCharacteristics; */
  21                 HUB_CHAR_INDV_PORT_OCPM, /* (per-port OC, no power switching) */
  22         0x00,
  23         0x01,                   /*  __u8  bPwrOn2pwrGood; 2ms */
  24         0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
  25         0x00,                   /*  __u8  DeviceRemovable; *** 7 Ports max */
  26         0xff                    /*  __u8  PortPwrCtrlMask; *** 7 ports max */
  27 };
  28
  29 #define UHCI_RH_MAXCHILD        7
  30
  31 /* must write as zeroes */
  32 #define WZ_BITS         (USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4)
  33
  34 /* status change bits:  nonzero writes will clear */
  35 #define RWC_BITS        (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
  36
  37 /* suspend/resume bits: port suspended or port resuming */
  38 #define SUSPEND_BITS    (USBPORTSC_SUSP | USBPORTSC_RD)
  39
  40 /* A port that either is connected or has a changed-bit set will prevent
  41  * us from AUTO_STOPPING.
  42  */
  43 static int any_ports_active(struct uhci_hcd *uhci)
  44 {
  45         int port;
  46
  47         for (port = 0; port < uhci->rh_numports; ++port) {
  48                 if ((uhci_readw(uhci, USBPORTSC1 + port * 2) &
  49                                 (USBPORTSC_CCS | RWC_BITS)) ||
  50                                 test_bit(port, &uhci->port_c_suspend))
  51                         return 1;
  52         }
  53         return 0;
  54 }
  55
  56 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
  57 {
  58         int port;
  59         int mask = RWC_BITS;
  60
  61         /* Some boards (both VIA and Intel apparently) report bogus
  62          * overcurrent indications, causing massive log spam unless
  63          * we completely ignore them.  This doesn't seem to be a problem
  64          * with the chipset so much as with the way it is connected on
  65          * the motherboard; if the overcurrent input is left to float
  66          * then it may constantly register false positives. */
  67         if (ignore_oc)
  68                 mask &= ~USBPORTSC_OCC;
  69
  70         *buf = 0;
  71         for (port = 0; port < uhci->rh_numports; ++port) {
  72                 if ((uhci_readw(uhci, USBPORTSC1 + port * 2) & mask) ||
  73                                 test_bit(port, &uhci->port_c_suspend))
  74                         *buf |= (1 << (port + 1));
  75         }
  76         return !!*buf;
  77 }
  78
  79 #define CLR_RH_PORTSTAT(x) \
  80         status = uhci_readw(uhci, port_addr);   \
  81         status &= ~(RWC_BITS|WZ_BITS); \
  82         status &= ~(x); \
  83         status |= RWC_BITS & (x); \
  84         uhci_writew(uhci, status, port_addr)
  85
  86 #define SET_RH_PORTSTAT(x) \
  87         status = uhci_readw(uhci, port_addr);   \
  88         status |= (x); \
  89         status &= ~(RWC_BITS|WZ_BITS); \
  90         uhci_writew(uhci, status, port_addr)
  91
  92 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
  93  * so we have to poll and check timeouts in order to take care of it.
  94  */
  95 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
  96                 unsigned long port_addr)
  97 {
  98         int status;
  99         int i;
 100
 101         if (uhci_readw(uhci, port_addr) & SUSPEND_BITS) {
 102                 CLR_RH_PORTSTAT(SUSPEND_BITS);
 103                 if (test_bit(port, &uhci->resuming_ports))
 104                         set_bit(port, &uhci->port_c_suspend);
 105
 106                 /* The controller won't actually turn off the RD bit until
 107                  * it has had a chance to send a low-speed EOP sequence,
 108                  * which is supposed to take 3 bit times (= 2 microseconds).
 109                  * Experiments show that some controllers take longer, so
 110                  * we'll poll for completion. */
 111                 for (i = 0; i < 10; ++i) {
 112                         if (!(uhci_readw(uhci, port_addr) & SUSPEND_BITS))
 113                                 break;
 114                         udelay(1);
 115                 }
 116         }
 117         clear_bit(port, &uhci->resuming_ports);
 118         usb_hcd_end_port_resume(&uhci_to_hcd(uhci)->self, port);
 119 }
 120
 121 /* Wait for the UHCI controller in HP's iLO2 server management chip.
 122  * It can take up to 250 us to finish a reset and set the CSC bit.
 123  */
 124 static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr)
 125 {
 126         int i;
 127
 128         for (i = 10; i < 250; i += 10) {
 129                 if (uhci_readw(uhci, port_addr) & USBPORTSC_CSC)
 130                         return;
 131                 udelay(10);
 132         }
 133         /* Log a warning? */
 134 }
 135
 136 static void uhci_check_ports(struct uhci_hcd *uhci)
 137 {
 138         unsigned int port;
 139         unsigned long port_addr;
 140         int status;
 141
 142         for (port = 0; port < uhci->rh_numports; ++port) {
 143                 port_addr = USBPORTSC1 + 2 * port;
 144                 status = uhci_readw(uhci, port_addr);
 145                 if (unlikely(status & USBPORTSC_PR)) {
 146                         if (time_after_eq(jiffies, uhci->ports_timeout)) {
 147                                 CLR_RH_PORTSTAT(USBPORTSC_PR);
 148                                 udelay(10);
 149
 150                                 /* HP's server management chip requires
 151                                  * a longer delay. */
 152                                 if (uhci->wait_for_hp)
 153                                         wait_for_HP(uhci, port_addr);
 154
 155                                 /* If the port was enabled before, turning
 156                                  * reset on caused a port enable change.
 157                                  * Turning reset off causes a port connect
 158                                  * status change.  Clear these changes. */
 159                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
 160                                 SET_RH_PORTSTAT(USBPORTSC_PE);
 161                         }
 162                 }
 163                 if (unlikely(status & USBPORTSC_RD)) {
 164                         if (!test_bit(port, &uhci->resuming_ports)) {
 165
 166                                 /* Port received a wakeup request */
 167                                 set_bit(port, &uhci->resuming_ports);
 168                                 uhci->ports_timeout = jiffies +
 169                                         msecs_to_jiffies(USB_RESUME_TIMEOUT);
 170                                 usb_hcd_start_port_resume(
 171                                                 &uhci_to_hcd(uhci)->self, port);
 172
 173                                 /* Make sure we see the port again
 174                                  * after the resuming period is over. */
 175                                 mod_timer(&uhci_to_hcd(uhci)->rh_timer,
 176                                                 uhci->ports_timeout);
 177                         } else if (time_after_eq(jiffies,
 178                                                 uhci->ports_timeout)) {
 179                                 uhci_finish_suspend(uhci, port, port_addr);
 180                         }
 181                 }
 182         }
 183 }
 184
 185 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 186 {
 187         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 188         unsigned long flags;
 189         int status = 0;
 190
 191         spin_lock_irqsave(&uhci->lock, flags);
 192
 193         uhci_scan_schedule(uhci);
 194         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 195                 goto done;
 196         uhci_check_ports(uhci);
 197
 198         status = get_hub_status_data(uhci, buf);
 199
 200         switch (uhci->rh_state) {
 201             case UHCI_RH_SUSPENDED:
 202                 /* if port change, ask to be resumed */
 203                 if (status || uhci->resuming_ports) {
 204                         status = 1;
 205                         usb_hcd_resume_root_hub(hcd);
 206                 }
 207                 break;
 208
 209             case UHCI_RH_AUTO_STOPPED:
 210                 /* if port change, auto start */
 211                 if (status)
 212                         wakeup_rh(uhci);
 213                 break;
 214
 215             case UHCI_RH_RUNNING:
 216                 /* are any devices attached? */
 217                 if (!any_ports_active(uhci)) {
 218                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
 219                         uhci->auto_stop_time = jiffies + HZ;
 220                 }
 221                 break;
 222
 223             case UHCI_RH_RUNNING_NODEVS:
 224                 /* auto-stop if nothing connected for 1 second */
 225                 if (any_ports_active(uhci))
 226                         uhci->rh_state = UHCI_RH_RUNNING;
 227                 else if (time_after_eq(jiffies, uhci->auto_stop_time) &&
 228                                 !uhci->wait_for_hp)
 229                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
 230                 break;
 231
 232             default:
 233                 break;
 234         }
 235
 236 done:
 237         spin_unlock_irqrestore(&uhci->lock, flags);
 238         return status;
 239 }
 240
 241 /* size of returned buffer is part of USB spec */
 242 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 243                         u16 wIndex, char *buf, u16 wLength)
 244 {
 245         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 246         int status, lstatus, retval = 0;
 247         unsigned int port = wIndex - 1;
 248         unsigned long port_addr = USBPORTSC1 + 2 * port;
 249         u16 wPortChange, wPortStatus;
 250         unsigned long flags;
 251
 252         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 253                 return -ETIMEDOUT;
 254
 255         spin_lock_irqsave(&uhci->lock, flags);
 256         switch (typeReq) {
 257
 258         case GetHubStatus:
 259                 *(__le32 *)buf = cpu_to_le32(0);
 260                 retval = 4; /* hub power */
 261                 break;
 262         case GetPortStatus:
 263                 if (port >= uhci->rh_numports)
 264                         goto err;
 265
 266                 uhci_check_ports(uhci);
 267                 status = uhci_readw(uhci, port_addr);
 268
 269                 /* Intel controllers report the OverCurrent bit active on.
 270                  * VIA controllers report it active off, so we'll adjust the
 271                  * bit value.  (It's not standardized in the UHCI spec.)
 272                  */
 273                 if (uhci->oc_low)
 274                         status ^= USBPORTSC_OC;
 275
 276                 /* UHCI doesn't support C_RESET (always false) */
 277                 wPortChange = lstatus = 0;
 278                 if (status & USBPORTSC_CSC)
 279                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
 280                 if (status & USBPORTSC_PEC)
 281                         wPortChange |= USB_PORT_STAT_C_ENABLE;
 282                 if ((status & USBPORTSC_OCC) && !ignore_oc)
 283                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
 284
 285                 if (test_bit(port, &uhci->port_c_suspend)) {
 286                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
 287                         lstatus |= 1;
 288                 }
 289                 if (test_bit(port, &uhci->resuming_ports))
 290                         lstatus |= 4;
 291
 292                 /* UHCI has no power switching (always on) */
 293                 wPortStatus = USB_PORT_STAT_POWER;
 294                 if (status & USBPORTSC_CCS)
 295                         wPortStatus |= USB_PORT_STAT_CONNECTION;
 296                 if (status & USBPORTSC_PE) {
 297                         wPortStatus |= USB_PORT_STAT_ENABLE;
 298                         if (status & SUSPEND_BITS)
 299                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
 300                 }
 301                 if (status & USBPORTSC_OC)
 302                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
 303                 if (status & USBPORTSC_PR)
 304                         wPortStatus |= USB_PORT_STAT_RESET;
 305                 if (status & USBPORTSC_LSDA)
 306                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
 307
 308                 if (wPortChange)
 309                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
 310                                         wIndex, status, lstatus);
 311
 312                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
 313                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
 314                 retval = 4;
 315                 break;
 316         case SetHubFeature:             /* We don't implement these */
 317         case ClearHubFeature:
 318                 switch (wValue) {
 319                 case C_HUB_OVER_CURRENT:
 320                 case C_HUB_LOCAL_POWER:
 321                         break;
 322                 default:
 323                         goto err;
 324                 }
 325                 break;
 326         case SetPortFeature:
 327                 if (port >= uhci->rh_numports)
 328                         goto err;
 329
 330                 switch (wValue) {
 331                 case USB_PORT_FEAT_SUSPEND:
 332                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
 333                         break;
 334                 case USB_PORT_FEAT_RESET:
 335                         SET_RH_PORTSTAT(USBPORTSC_PR);
 336
 337                         /* Reset terminates Resume signalling */
 338                         uhci_finish_suspend(uhci, port, port_addr);
 339
 340                         /* USB v2.0 7.1.7.5 */
 341                         uhci->ports_timeout = jiffies +
 342                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 343                         break;
 344                 case USB_PORT_FEAT_POWER:
 345                         /* UHCI has no power switching */
 346                         break;
 347                 default:
 348                         goto err;
 349                 }
 350                 break;
 351         case ClearPortFeature:
 352                 if (port >= uhci->rh_numports)
 353                         goto err;
 354
 355                 switch (wValue) {
 356                 case USB_PORT_FEAT_ENABLE:
 357                         CLR_RH_PORTSTAT(USBPORTSC_PE);
 358
 359                         /* Disable terminates Resume signalling */
 360                         uhci_finish_suspend(uhci, port, port_addr);
 361                         break;
 362                 case USB_PORT_FEAT_C_ENABLE:
 363                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
 364                         break;
 365                 case USB_PORT_FEAT_SUSPEND:
 366                         if (!(uhci_readw(uhci, port_addr) & USBPORTSC_SUSP)) {
 367
 368                                 /* Make certain the port isn't suspended */
 369                                 uhci_finish_suspend(uhci, port, port_addr);
 370                         } else if (!test_and_set_bit(port,
 371                                                 &uhci->resuming_ports)) {
 372                                 SET_RH_PORTSTAT(USBPORTSC_RD);
 373
 374                                 /* The controller won't allow RD to be set
 375                                  * if the port is disabled.  When this happens
 376                                  * just skip the Resume signalling.
 377                                  */
 378                                 if (!(uhci_readw(uhci, port_addr) &
 379                                                 USBPORTSC_RD))
 380                                         uhci_finish_suspend(uhci, port,
 381                                                         port_addr);
 382                                 else
 383                                         /* USB v2.0 7.1.7.7 */
 384                                         uhci->ports_timeout = jiffies +
 385                                                 msecs_to_jiffies(20);
 386                         }
 387                         break;
 388                 case USB_PORT_FEAT_C_SUSPEND:
 389                         clear_bit(port, &uhci->port_c_suspend);
 390                         break;
 391                 case USB_PORT_FEAT_POWER:
 392                         /* UHCI has no power switching */
 393                         goto err;
 394                 case USB_PORT_FEAT_C_CONNECTION:
 395                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
 396                         break;
 397                 case USB_PORT_FEAT_C_OVER_CURRENT:
 398                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
 399                         break;
 400                 case USB_PORT_FEAT_C_RESET:
 401                         /* this driver won't report these */
 402                         break;
 403                 default:
 404                         goto err;
 405                 }
 406                 break;
 407         case GetHubDescriptor:
 408                 retval = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
 409                 memcpy(buf, root_hub_hub_des, retval);
 410                 if (retval > 2)
 411                         buf[2] = uhci->rh_numports;
 412                 break;
 413         default:
 414 err:
 415                 retval = -EPIPE;
 416         }
 417         spin_unlock_irqrestore(&uhci->lock, flags);
 418
 419         return retval;
 420 }