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         0x29,                   /*  __u8  bDescriptorType; Hub-descriptor */
  19         0x02,                   /*  __u8  bNbrPorts; */
  20         0x0a,                   /* __u16  wHubCharacteristics; */
  21         0x00,                   /*   (per-port OC, no power switching) */
  22         0x01,                   /*  __u8  bPwrOn2pwrGood; 2ms */
  23         0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
  24         0x00,                   /*  __u8  DeviceRemovable; *** 7 Ports max *** */
  25         0xff                    /*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
  26 };
  27
  28 #define UHCI_RH_MAXCHILD        7
  29
  30 /* must write as zeroes */
  31 #define WZ_BITS         (USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4)
  32
  33 /* status change bits:  nonzero writes will clear */
  34 #define RWC_BITS        (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
  35
  36 /* suspend/resume bits: port suspended or port resuming */
  37 #define SUSPEND_BITS    (USBPORTSC_SUSP | USBPORTSC_RD)
  38
  39 /* A port that either is connected or has a changed-bit set will prevent
  40  * us from AUTO_STOPPING.
  41  */
  42 static int any_ports_active(struct uhci_hcd *uhci)
  43 {
  44         int port;
  45
  46         for (port = 0; port < uhci->rh_numports; ++port) {
  47                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
  48                                 (USBPORTSC_CCS | RWC_BITS)) ||
  49                                 test_bit(port, &uhci->port_c_suspend))
  50                         return 1;
  51         }
  52         return 0;
  53 }
  54
  55 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
  56 {
  57         int port;
  58         int mask = RWC_BITS;
  59
  60         /* Some boards (both VIA and Intel apparently) report bogus
  61          * overcurrent indications, causing massive log spam unless
  62          * we completely ignore them.  This doesn't seem to be a problem
  63          * with the chipset so much as with the way it is connected on
  64          * the motherboard; if the overcurrent input is left to float
  65          * then it may constantly register false positives. */
  66         if (ignore_oc)
  67                 mask &= ~USBPORTSC_OCC;
  68
  69         *buf = 0;
  70         for (port = 0; port < uhci->rh_numports; ++port) {
  71                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & mask) ||
  72                                 test_bit(port, &uhci->port_c_suspend))
  73                         *buf |= (1 << (port + 1));
  74         }
  75         return !!*buf;
  76 }
  77
  78 #define OK(x)                   len = (x); break
  79
  80 #define CLR_RH_PORTSTAT(x) \
  81         status = inw(port_addr); \
  82         status &= ~(RWC_BITS|WZ_BITS); \
  83         status &= ~(x); \
  84         status |= RWC_BITS & (x); \
  85         outw(status, port_addr)
  86
  87 #define SET_RH_PORTSTAT(x) \
  88         status = inw(port_addr); \
  89         status |= (x); \
  90         status &= ~(RWC_BITS|WZ_BITS); \
  91         outw(status, port_addr)
  92
  93 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
  94  * so we have to poll and check timeouts in order to take care of it.
  95  */
  96 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
  97                 unsigned long port_addr)
  98 {
  99         int status;
 100         int i;
 101
 102         if (inw(port_addr) & SUSPEND_BITS) {
 103                 CLR_RH_PORTSTAT(SUSPEND_BITS);
 104                 if (test_bit(port, &uhci->resuming_ports))
 105                         set_bit(port, &uhci->port_c_suspend);
 106
 107                 /* The controller won't actually turn off the RD bit until
 108                  * it has had a chance to send a low-speed EOP sequence,
 109                  * which is supposed to take 3 bit times (= 2 microseconds).
 110                  * Experiments show that some controllers take longer, so
 111                  * we'll poll for completion. */
 112                 for (i = 0; i < 10; ++i) {
 113                         if (!(inw(port_addr) & SUSPEND_BITS))
 114                                 break;
 115                         udelay(1);
 116                 }
 117         }
 118         clear_bit(port, &uhci->resuming_ports);
 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(unsigned long port_addr)
 125 {
 126         int i;
 127
 128         for (i = 10; i < 250; i += 10) {
 129                 if (inw(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 = uhci->io_addr + USBPORTSC1 + 2 * port;
 144                 status = inw(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 (to_pci_dev(uhci_dev(uhci))->vendor ==
 153                                                 PCI_VENDOR_ID_HP)
 154                                         wait_for_HP(port_addr);
 155
 156                                 /* If the port was enabled before, turning
 157                                  * reset on caused a port enable change.
 158                                  * Turning reset off causes a port connect
 159                                  * status change.  Clear these changes. */
 160                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
 161                                 SET_RH_PORTSTAT(USBPORTSC_PE);
 162                         }
 163                 }
 164                 if (unlikely(status & USBPORTSC_RD)) {
 165                         if (!test_bit(port, &uhci->resuming_ports)) {
 166
 167                                 /* Port received a wakeup request */
 168                                 set_bit(port, &uhci->resuming_ports);
 169                                 uhci->ports_timeout = jiffies +
 170                                                 msecs_to_jiffies(25);
 171
 172                                 /* Make sure we see the port again
 173                                  * after the resuming period is over. */
 174                                 mod_timer(&uhci_to_hcd(uhci)->rh_timer,
 175                                                 uhci->ports_timeout);
 176                         } else if (time_after_eq(jiffies,
 177                                                 uhci->ports_timeout)) {
 178                                 uhci_finish_suspend(uhci, port, port_addr);
 179                         }
 180                 }
 181         }
 182 }
 183
 184 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 185 {
 186         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 187         unsigned long flags;
 188         int status = 0;
 189
 190         spin_lock_irqsave(&uhci->lock, flags);
 191
 192         uhci_scan_schedule(uhci);
 193         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 194                 goto done;
 195         uhci_check_ports(uhci);
 196
 197         status = get_hub_status_data(uhci, buf);
 198
 199         switch (uhci->rh_state) {
 200             case UHCI_RH_SUSPENDING:
 201             case UHCI_RH_SUSPENDED:
 202                 /* if port change, ask to be resumed */
 203                 if (status || uhci->resuming_ports)
 204                         usb_hcd_resume_root_hub(hcd);
 205                 break;
 206
 207             case UHCI_RH_AUTO_STOPPED:
 208                 /* if port change, auto start */
 209                 if (status)
 210                         wakeup_rh(uhci);
 211                 break;
 212
 213             case UHCI_RH_RUNNING:
 214                 /* are any devices attached? */
 215                 if (!any_ports_active(uhci)) {
 216                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
 217                         uhci->auto_stop_time = jiffies + HZ;
 218                 }
 219                 break;
 220
 221             case UHCI_RH_RUNNING_NODEVS:
 222                 /* auto-stop if nothing connected for 1 second */
 223                 if (any_ports_active(uhci))
 224                         uhci->rh_state = UHCI_RH_RUNNING;
 225                 else if (time_after_eq(jiffies, uhci->auto_stop_time))
 226                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
 227                 break;
 228
 229             default:
 230                 break;
 231         }
 232
 233 done:
 234         spin_unlock_irqrestore(&uhci->lock, flags);
 235         return status;
 236 }
 237
 238 /* size of returned buffer is part of USB spec */
 239 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 240                         u16 wIndex, char *buf, u16 wLength)
 241 {
 242         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 243         int status, lstatus, retval = 0, len = 0;
 244         unsigned int port = wIndex - 1;
 245         unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
 246         u16 wPortChange, wPortStatus;
 247         unsigned long flags;
 248
 249         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 250                 return -ETIMEDOUT;
 251
 252         spin_lock_irqsave(&uhci->lock, flags);
 253         switch (typeReq) {
 254
 255         case GetHubStatus:
 256                 *(__le32 *)buf = cpu_to_le32(0);
 257                 OK(4);          /* hub power */
 258         case GetPortStatus:
 259                 if (port >= uhci->rh_numports)
 260                         goto err;
 261
 262                 uhci_check_ports(uhci);
 263                 status = inw(port_addr);
 264
 265                 /* Intel controllers report the OverCurrent bit active on.
 266                  * VIA controllers report it active off, so we'll adjust the
 267                  * bit value.  (It's not standardized in the UHCI spec.)
 268                  */
 269                 if (to_pci_dev(hcd->self.controller)->vendor ==
 270                                 PCI_VENDOR_ID_VIA)
 271                         status ^= USBPORTSC_OC;
 272
 273                 /* UHCI doesn't support C_RESET (always false) */
 274                 wPortChange = lstatus = 0;
 275                 if (status & USBPORTSC_CSC)
 276                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
 277                 if (status & USBPORTSC_PEC)
 278                         wPortChange |= USB_PORT_STAT_C_ENABLE;
 279                 if ((status & USBPORTSC_OCC) && !ignore_oc)
 280                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
 281
 282                 if (test_bit(port, &uhci->port_c_suspend)) {
 283                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
 284                         lstatus |= 1;
 285                 }
 286                 if (test_bit(port, &uhci->resuming_ports))
 287                         lstatus |= 4;
 288
 289                 /* UHCI has no power switching (always on) */
 290                 wPortStatus = USB_PORT_STAT_POWER;
 291                 if (status & USBPORTSC_CCS)
 292                         wPortStatus |= USB_PORT_STAT_CONNECTION;
 293                 if (status & USBPORTSC_PE) {
 294                         wPortStatus |= USB_PORT_STAT_ENABLE;
 295                         if (status & SUSPEND_BITS)
 296                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
 297                 }
 298                 if (status & USBPORTSC_OC)
 299                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
 300                 if (status & USBPORTSC_PR)
 301                         wPortStatus |= USB_PORT_STAT_RESET;
 302                 if (status & USBPORTSC_LSDA)
 303                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
 304
 305                 if (wPortChange)
 306                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
 307                                         wIndex, status, lstatus);
 308
 309                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
 310                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
 311                 OK(4);
 312         case SetHubFeature:             /* We don't implement these */
 313         case ClearHubFeature:
 314                 switch (wValue) {
 315                 case C_HUB_OVER_CURRENT:
 316                 case C_HUB_LOCAL_POWER:
 317                         OK(0);
 318                 default:
 319                         goto err;
 320                 }
 321                 break;
 322         case SetPortFeature:
 323                 if (port >= uhci->rh_numports)
 324                         goto err;
 325
 326                 switch (wValue) {
 327                 case USB_PORT_FEAT_SUSPEND:
 328                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
 329                         OK(0);
 330                 case USB_PORT_FEAT_RESET:
 331                         SET_RH_PORTSTAT(USBPORTSC_PR);
 332
 333                         /* Reset terminates Resume signalling */
 334                         uhci_finish_suspend(uhci, port, port_addr);
 335
 336                         /* USB v2.0 7.1.7.5 */
 337                         uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
 338                         OK(0);
 339                 case USB_PORT_FEAT_POWER:
 340                         /* UHCI has no power switching */
 341                         OK(0);
 342                 default:
 343                         goto err;
 344                 }
 345                 break;
 346         case ClearPortFeature:
 347                 if (port >= uhci->rh_numports)
 348                         goto err;
 349
 350                 switch (wValue) {
 351                 case USB_PORT_FEAT_ENABLE:
 352                         CLR_RH_PORTSTAT(USBPORTSC_PE);
 353
 354                         /* Disable terminates Resume signalling */
 355                         uhci_finish_suspend(uhci, port, port_addr);
 356                         OK(0);
 357                 case USB_PORT_FEAT_C_ENABLE:
 358                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
 359                         OK(0);
 360                 case USB_PORT_FEAT_SUSPEND:
 361                         if (!(inw(port_addr) & USBPORTSC_SUSP)) {
 362
 363                                 /* Make certain the port isn't suspended */
 364                                 uhci_finish_suspend(uhci, port, port_addr);
 365                         } else if (!test_and_set_bit(port,
 366                                                 &uhci->resuming_ports)) {
 367                                 SET_RH_PORTSTAT(USBPORTSC_RD);
 368
 369                                 /* The controller won't allow RD to be set
 370                                  * if the port is disabled.  When this happens
 371                                  * just skip the Resume signalling.
 372                                  */
 373                                 if (!(inw(port_addr) & USBPORTSC_RD))
 374                                         uhci_finish_suspend(uhci, port,
 375                                                         port_addr);
 376                                 else
 377                                         /* USB v2.0 7.1.7.7 */
 378                                         uhci->ports_timeout = jiffies +
 379                                                 msecs_to_jiffies(20);
 380                         }
 381                         OK(0);
 382                 case USB_PORT_FEAT_C_SUSPEND:
 383                         clear_bit(port, &uhci->port_c_suspend);
 384                         OK(0);
 385                 case USB_PORT_FEAT_POWER:
 386                         /* UHCI has no power switching */
 387                         goto err;
 388                 case USB_PORT_FEAT_C_CONNECTION:
 389                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
 390                         OK(0);
 391                 case USB_PORT_FEAT_C_OVER_CURRENT:
 392                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
 393                         OK(0);
 394                 case USB_PORT_FEAT_C_RESET:
 395                         /* this driver won't report these */
 396                         OK(0);
 397                 default:
 398                         goto err;
 399                 }
 400                 break;
 401         case GetHubDescriptor:
 402                 len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
 403                 memcpy(buf, root_hub_hub_des, len);
 404                 if (len > 2)
 405                         buf[2] = uhci->rh_numports;
 406                 OK(len);
 407         default:
 408 err:
 409                 retval = -EPIPE;
 410         }
 411         spin_unlock_irqrestore(&uhci->lock, flags);
 412
 413         return retval;
 414 }