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 ((uhci_readw(uhci, 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 ((uhci_readw(uhci, 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 CLR_RH_PORTSTAT(x) \
  79         status = uhci_readw(uhci, port_addr);   \
  80         status &= ~(RWC_BITS|WZ_BITS); \
  81         status &= ~(x); \
  82         status |= RWC_BITS & (x); \
  83         uhci_writew(uhci, status, port_addr)
  84
  85 #define SET_RH_PORTSTAT(x) \
  86         status = uhci_readw(uhci, port_addr);   \
  87         status |= (x); \
  88         status &= ~(RWC_BITS|WZ_BITS); \
  89         uhci_writew(uhci, status, port_addr)
  90
  91 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
  92  * so we have to poll and check timeouts in order to take care of it.
  93  */
  94 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
  95                 unsigned long port_addr)
  96 {
  97         int status;
  98         int i;
  99
 100         if (uhci_readw(uhci, port_addr) & SUSPEND_BITS) {
 101                 CLR_RH_PORTSTAT(SUSPEND_BITS);
 102                 if (test_bit(port, &uhci->resuming_ports))
 103                         set_bit(port, &uhci->port_c_suspend);
 104
 105                 /* The controller won't actually turn off the RD bit until
 106                  * it has had a chance to send a low-speed EOP sequence,
 107                  * which is supposed to take 3 bit times (= 2 microseconds).
 108                  * Experiments show that some controllers take longer, so
 109                  * we'll poll for completion. */
 110                 for (i = 0; i < 10; ++i) {
 111                         if (!(uhci_readw(uhci, port_addr) & SUSPEND_BITS))
 112                                 break;
 113                         udelay(1);
 114                 }
 115         }
 116         clear_bit(port, &uhci->resuming_ports);
 117         usb_hcd_end_port_resume(&uhci_to_hcd(uhci)->self, port);
 118 }
 119
 120 /* Wait for the UHCI controller in HP's iLO2 server management chip.
 121  * It can take up to 250 us to finish a reset and set the CSC bit.
 122  */
 123 static void wait_for_HP(struct uhci_hcd *uhci, unsigned long port_addr)
 124 {
 125         int i;
 126
 127         for (i = 10; i < 250; i += 10) {
 128                 if (uhci_readw(uhci, port_addr) & USBPORTSC_CSC)
 129                         return;
 130                 udelay(10);
 131         }
 132         /* Log a warning? */
 133 }
 134
 135 static void uhci_check_ports(struct uhci_hcd *uhci)
 136 {
 137         unsigned int port;
 138         unsigned long port_addr;
 139         int status;
 140
 141         for (port = 0; port < uhci->rh_numports; ++port) {
 142                 port_addr = USBPORTSC1 + 2 * port;
 143                 status = uhci_readw(uhci, port_addr);
 144                 if (unlikely(status & USBPORTSC_PR)) {
 145                         if (time_after_eq(jiffies, uhci->ports_timeout)) {
 146                                 CLR_RH_PORTSTAT(USBPORTSC_PR);
 147                                 udelay(10);
 148
 149                                 /* HP's server management chip requires
 150                                  * a longer delay. */
 151                                 if (uhci->wait_for_hp)
 152                                         wait_for_HP(uhci, port_addr);
 153
 154                                 /* If the port was enabled before, turning
 155                                  * reset on caused a port enable change.
 156                                  * Turning reset off causes a port connect
 157                                  * status change.  Clear these changes. */
 158                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
 159                                 SET_RH_PORTSTAT(USBPORTSC_PE);
 160                         }
 161                 }
 162                 if (unlikely(status & USBPORTSC_RD)) {
 163                         if (!test_bit(port, &uhci->resuming_ports)) {
 164
 165                                 /* Port received a wakeup request */
 166                                 set_bit(port, &uhci->resuming_ports);
 167                                 uhci->ports_timeout = jiffies +
 168                                                 msecs_to_jiffies(25);
 169                                 usb_hcd_start_port_resume(
 170                                                 &uhci_to_hcd(uhci)->self, port);
 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_SUSPENDED:
 201                 /* if port change, ask to be resumed */
 202                 if (status || uhci->resuming_ports) {
 203                         status = 1;
 204                         usb_hcd_resume_root_hub(hcd);
 205                 }
 206                 break;
 207
 208             case UHCI_RH_AUTO_STOPPED:
 209                 /* if port change, auto start */
 210                 if (status)
 211                         wakeup_rh(uhci);
 212                 break;
 213
 214             case UHCI_RH_RUNNING:
 215                 /* are any devices attached? */
 216                 if (!any_ports_active(uhci)) {
 217                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
 218                         uhci->auto_stop_time = jiffies + HZ;
 219                 }
 220                 break;
 221
 222             case UHCI_RH_RUNNING_NODEVS:
 223                 /* auto-stop if nothing connected for 1 second */
 224                 if (any_ports_active(uhci))
 225                         uhci->rh_state = UHCI_RH_RUNNING;
 226                 else if (time_after_eq(jiffies, uhci->auto_stop_time) &&
 227                                 !uhci->wait_for_hp)
 228                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
 229                 break;
 230
 231             default:
 232                 break;
 233         }
 234
 235 done:
 236         spin_unlock_irqrestore(&uhci->lock, flags);
 237         return status;
 238 }
 239
 240 /* size of returned buffer is part of USB spec */
 241 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 242                         u16 wIndex, char *buf, u16 wLength)
 243 {
 244         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 245         int status, lstatus, retval = 0;
 246         unsigned int port = wIndex - 1;
 247         unsigned long port_addr = USBPORTSC1 + 2 * port;
 248         u16 wPortChange, wPortStatus;
 249         unsigned long flags;
 250
 251         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 252                 return -ETIMEDOUT;
 253
 254         spin_lock_irqsave(&uhci->lock, flags);
 255         switch (typeReq) {
 256
 257         case GetHubStatus:
 258                 *(__le32 *)buf = cpu_to_le32(0);
 259                 retval = 4; /* hub power */
 260                 break;
 261         case GetPortStatus:
 262                 if (port >= uhci->rh_numports)
 263                         goto err;
 264
 265                 uhci_check_ports(uhci);
 266                 status = uhci_readw(uhci, port_addr);
 267
 268                 /* Intel controllers report the OverCurrent bit active on.
 269                  * VIA controllers report it active off, so we'll adjust the
 270                  * bit value.  (It's not standardized in the UHCI spec.)
 271                  */
 272                 if (uhci->oc_low)
 273                         status ^= USBPORTSC_OC;
 274
 275                 /* UHCI doesn't support C_RESET (always false) */
 276                 wPortChange = lstatus = 0;
 277                 if (status & USBPORTSC_CSC)
 278                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
 279                 if (status & USBPORTSC_PEC)
 280                         wPortChange |= USB_PORT_STAT_C_ENABLE;
 281                 if ((status & USBPORTSC_OCC) && !ignore_oc)
 282                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
 283
 284                 if (test_bit(port, &uhci->port_c_suspend)) {
 285                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
 286                         lstatus |= 1;
 287                 }
 288                 if (test_bit(port, &uhci->resuming_ports))
 289                         lstatus |= 4;
 290
 291                 /* UHCI has no power switching (always on) */
 292                 wPortStatus = USB_PORT_STAT_POWER;
 293                 if (status & USBPORTSC_CCS)
 294                         wPortStatus |= USB_PORT_STAT_CONNECTION;
 295                 if (status & USBPORTSC_PE) {
 296                         wPortStatus |= USB_PORT_STAT_ENABLE;
 297                         if (status & SUSPEND_BITS)
 298                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
 299                 }
 300                 if (status & USBPORTSC_OC)
 301                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
 302                 if (status & USBPORTSC_PR)
 303                         wPortStatus |= USB_PORT_STAT_RESET;
 304                 if (status & USBPORTSC_LSDA)
 305                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
 306
 307                 if (wPortChange)
 308                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
 309                                         wIndex, status, lstatus);
 310
 311                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
 312                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
 313                 retval = 4;
 314                 break;
 315         case SetHubFeature:             /* We don't implement these */
 316         case ClearHubFeature:
 317                 switch (wValue) {
 318                 case C_HUB_OVER_CURRENT:
 319                 case C_HUB_LOCAL_POWER:
 320                         break;
 321                 default:
 322                         goto err;
 323                 }
 324                 break;
 325         case SetPortFeature:
 326                 if (port >= uhci->rh_numports)
 327                         goto err;
 328
 329                 switch (wValue) {
 330                 case USB_PORT_FEAT_SUSPEND:
 331                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
 332                         break;
 333                 case USB_PORT_FEAT_RESET:
 334                         SET_RH_PORTSTAT(USBPORTSC_PR);
 335
 336                         /* Reset terminates Resume signalling */
 337                         uhci_finish_suspend(uhci, port, port_addr);
 338
 339                         /* USB v2.0 7.1.7.5 */
 340                         uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
 341                         break;
 342                 case USB_PORT_FEAT_POWER:
 343                         /* UHCI has no power switching */
 344                         break;
 345                 default:
 346                         goto err;
 347                 }
 348                 break;
 349         case ClearPortFeature:
 350                 if (port >= uhci->rh_numports)
 351                         goto err;
 352
 353                 switch (wValue) {
 354                 case USB_PORT_FEAT_ENABLE:
 355                         CLR_RH_PORTSTAT(USBPORTSC_PE);
 356
 357                         /* Disable terminates Resume signalling */
 358                         uhci_finish_suspend(uhci, port, port_addr);
 359                         break;
 360                 case USB_PORT_FEAT_C_ENABLE:
 361                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
 362                         break;
 363                 case USB_PORT_FEAT_SUSPEND:
 364                         if (!(uhci_readw(uhci, port_addr) & USBPORTSC_SUSP)) {
 365
 366                                 /* Make certain the port isn't suspended */
 367                                 uhci_finish_suspend(uhci, port, port_addr);
 368                         } else if (!test_and_set_bit(port,
 369                                                 &uhci->resuming_ports)) {
 370                                 SET_RH_PORTSTAT(USBPORTSC_RD);
 371
 372                                 /* The controller won't allow RD to be set
 373                                  * if the port is disabled.  When this happens
 374                                  * just skip the Resume signalling.
 375                                  */
 376                                 if (!(uhci_readw(uhci, port_addr) &
 377                                                 USBPORTSC_RD))
 378                                         uhci_finish_suspend(uhci, port,
 379                                                         port_addr);
 380                                 else
 381                                         /* USB v2.0 7.1.7.7 */
 382                                         uhci->ports_timeout = jiffies +
 383                                                 msecs_to_jiffies(20);
 384                         }
 385                         break;
 386                 case USB_PORT_FEAT_C_SUSPEND:
 387                         clear_bit(port, &uhci->port_c_suspend);
 388                         break;
 389                 case USB_PORT_FEAT_POWER:
 390                         /* UHCI has no power switching */
 391                         goto err;
 392                 case USB_PORT_FEAT_C_CONNECTION:
 393                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
 394                         break;
 395                 case USB_PORT_FEAT_C_OVER_CURRENT:
 396                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
 397                         break;
 398                 case USB_PORT_FEAT_C_RESET:
 399                         /* this driver won't report these */
 400                         break;
 401                 default:
 402                         goto err;
 403                 }
 404                 break;
 405         case GetHubDescriptor:
 406                 retval = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
 407                 memcpy(buf, root_hub_hub_des, retval);
 408                 if (retval > 2)
 409                         buf[2] = uhci->rh_numports;
 410                 break;
 411         default:
 412 err:
 413                 retval = -EPIPE;
 414         }
 415         spin_unlock_irqrestore(&uhci->lock, flags);
 416
 417         return retval;
 418 }