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 __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 /* A port that either is connected or has a changed-bit set will prevent
  37  * us from AUTO_STOPPING.
  38  */
  39 static int any_ports_active(struct uhci_hcd *uhci)
  40 {
  41         int port;
  42
  43         for (port = 0; port < uhci->rh_numports; ++port) {
  44                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
  45                                 (USBPORTSC_CCS | RWC_BITS)) ||
  46                                 test_bit(port, &uhci->port_c_suspend))
  47                         return 1;
  48         }
  49         return 0;
  50 }
  51
  52 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
  53 {
  54         int port;
  55
  56         *buf = 0;
  57         for (port = 0; port < uhci->rh_numports; ++port) {
  58                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) ||
  59                                 test_bit(port, &uhci->port_c_suspend))
  60                         *buf |= (1 << (port + 1));
  61         }
  62         return !!*buf;
  63 }
  64
  65 #define OK(x)                   len = (x); break
  66
  67 #define CLR_RH_PORTSTAT(x) \
  68         status = inw(port_addr); \
  69         status &= ~(RWC_BITS|WZ_BITS); \
  70         status &= ~(x); \
  71         status |= RWC_BITS & (x); \
  72         outw(status, port_addr)
  73
  74 #define SET_RH_PORTSTAT(x) \
  75         status = inw(port_addr); \
  76         status |= (x); \
  77         status &= ~(RWC_BITS|WZ_BITS); \
  78         outw(status, port_addr)
  79
  80 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
  81  * so we have to poll and check timeouts in order to take care of it.
  82  */
  83 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
  84                 unsigned long port_addr)
  85 {
  86         int status;
  87
  88         if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) {
  89                 CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
  90                 if (test_bit(port, &uhci->resuming_ports))
  91                         set_bit(port, &uhci->port_c_suspend);
  92
  93                 /* The controller won't actually turn off the RD bit until
  94                  * it has had a chance to send a low-speed EOP sequence,
  95                  * which takes 3 bit times (= 2 microseconds).  We'll delay
  96                  * slightly longer for good luck. */
  97                 udelay(4);
  98         }
  99         clear_bit(port, &uhci->resuming_ports);
 100 }
 101
 102 /* Wait for the UHCI controller in HP's iLO2 server management chip.
 103  * It can take up to 250 us to finish a reset and set the CSC bit.
 104  */
 105 static void wait_for_HP(unsigned long port_addr)
 106 {
 107         int i;
 108
 109         for (i = 10; i < 250; i += 10) {
 110                 if (inw(port_addr) & USBPORTSC_CSC)
 111                         return;
 112                 udelay(10);
 113         }
 114         /* Log a warning? */
 115 }
 116
 117 static void uhci_check_ports(struct uhci_hcd *uhci)
 118 {
 119         unsigned int port;
 120         unsigned long port_addr;
 121         int status;
 122
 123         for (port = 0; port < uhci->rh_numports; ++port) {
 124                 port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
 125                 status = inw(port_addr);
 126                 if (unlikely(status & USBPORTSC_PR)) {
 127                         if (time_after_eq(jiffies, uhci->ports_timeout)) {
 128                                 CLR_RH_PORTSTAT(USBPORTSC_PR);
 129                                 udelay(10);
 130
 131                                 /* HP's server management chip requires
 132                                  * a longer delay. */
 133                                 if (to_pci_dev(uhci_dev(uhci))->vendor ==
 134                                                 PCI_VENDOR_ID_HP)
 135                                         wait_for_HP(port_addr);
 136
 137                                 /* If the port was enabled before, turning
 138                                  * reset on caused a port enable change.
 139                                  * Turning reset off causes a port connect
 140                                  * status change.  Clear these changes. */
 141                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
 142                                 SET_RH_PORTSTAT(USBPORTSC_PE);
 143                         }
 144                 }
 145                 if (unlikely(status & USBPORTSC_RD)) {
 146                         if (!test_bit(port, &uhci->resuming_ports)) {
 147
 148                                 /* Port received a wakeup request */
 149                                 set_bit(port, &uhci->resuming_ports);
 150                                 uhci->ports_timeout = jiffies +
 151                                                 msecs_to_jiffies(20);
 152
 153                                 /* Make sure we see the port again
 154                                  * after the resuming period is over. */
 155                                 mod_timer(&uhci_to_hcd(uhci)->rh_timer,
 156                                                 uhci->ports_timeout);
 157                         } else if (time_after_eq(jiffies,
 158                                                 uhci->ports_timeout)) {
 159                                 uhci_finish_suspend(uhci, port, port_addr);
 160                         }
 161                 }
 162         }
 163 }
 164
 165 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 166 {
 167         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 168         unsigned long flags;
 169         int status = 0;
 170
 171         spin_lock_irqsave(&uhci->lock, flags);
 172
 173         uhci_scan_schedule(uhci, NULL);
 174         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
 175                 goto done;
 176         uhci_check_ports(uhci);
 177
 178         status = get_hub_status_data(uhci, buf);
 179
 180         switch (uhci->rh_state) {
 181             case UHCI_RH_SUSPENDING:
 182             case UHCI_RH_SUSPENDED:
 183                 /* if port change, ask to be resumed */
 184                 if (status)
 185                         usb_hcd_resume_root_hub(hcd);
 186                 break;
 187
 188             case UHCI_RH_AUTO_STOPPED:
 189                 /* if port change, auto start */
 190                 if (status)
 191                         wakeup_rh(uhci);
 192                 break;
 193
 194             case UHCI_RH_RUNNING:
 195                 /* are any devices attached? */
 196                 if (!any_ports_active(uhci)) {
 197                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
 198                         uhci->auto_stop_time = jiffies + HZ;
 199                 }
 200                 break;
 201
 202             case UHCI_RH_RUNNING_NODEVS:
 203                 /* auto-stop if nothing connected for 1 second */
 204                 if (any_ports_active(uhci))
 205                         uhci->rh_state = UHCI_RH_RUNNING;
 206                 else if (time_after_eq(jiffies, uhci->auto_stop_time))
 207                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
 208                 break;
 209
 210             default:
 211                 break;
 212         }
 213
 214 done:
 215         spin_unlock_irqrestore(&uhci->lock, flags);
 216         return status;
 217 }
 218
 219 /* size of returned buffer is part of USB spec */
 220 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 221                         u16 wIndex, char *buf, u16 wLength)
 222 {
 223         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 224         int status, lstatus, retval = 0, len = 0;
 225         unsigned int port = wIndex - 1;
 226         unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
 227         u16 wPortChange, wPortStatus;
 228         unsigned long flags;
 229
 230         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
 231                 return -ETIMEDOUT;
 232
 233         spin_lock_irqsave(&uhci->lock, flags);
 234         switch (typeReq) {
 235
 236         case GetHubStatus:
 237                 *(__le32 *)buf = cpu_to_le32(0);
 238                 OK(4);          /* hub power */
 239         case GetPortStatus:
 240                 if (port >= uhci->rh_numports)
 241                         goto err;
 242
 243                 uhci_check_ports(uhci);
 244                 status = inw(port_addr);
 245
 246                 /* Intel controllers report the OverCurrent bit active on.
 247                  * VIA controllers report it active off, so we'll adjust the
 248                  * bit value.  (It's not standardized in the UHCI spec.)
 249                  */
 250                 if (to_pci_dev(hcd->self.controller)->vendor ==
 251                                 PCI_VENDOR_ID_VIA)
 252                         status ^= USBPORTSC_OC;
 253
 254                 /* UHCI doesn't support C_RESET (always false) */
 255                 wPortChange = lstatus = 0;
 256                 if (status & USBPORTSC_CSC)
 257                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
 258                 if (status & USBPORTSC_PEC)
 259                         wPortChange |= USB_PORT_STAT_C_ENABLE;
 260                 if (status & USBPORTSC_OCC)
 261                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
 262
 263                 if (test_bit(port, &uhci->port_c_suspend)) {
 264                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
 265                         lstatus |= 1;
 266                 }
 267                 if (test_bit(port, &uhci->resuming_ports))
 268                         lstatus |= 4;
 269
 270                 /* UHCI has no power switching (always on) */
 271                 wPortStatus = USB_PORT_STAT_POWER;
 272                 if (status & USBPORTSC_CCS)
 273                         wPortStatus |= USB_PORT_STAT_CONNECTION;
 274                 if (status & USBPORTSC_PE) {
 275                         wPortStatus |= USB_PORT_STAT_ENABLE;
 276                         if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
 277                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
 278                 }
 279                 if (status & USBPORTSC_OC)
 280                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
 281                 if (status & USBPORTSC_PR)
 282                         wPortStatus |= USB_PORT_STAT_RESET;
 283                 if (status & USBPORTSC_LSDA)
 284                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
 285
 286                 if (wPortChange)
 287                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
 288                                         wIndex, status, lstatus);
 289
 290                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
 291                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
 292                 OK(4);
 293         case SetHubFeature:             /* We don't implement these */
 294         case ClearHubFeature:
 295                 switch (wValue) {
 296                 case C_HUB_OVER_CURRENT:
 297                 case C_HUB_LOCAL_POWER:
 298                         OK(0);
 299                 default:
 300                         goto err;
 301                 }
 302                 break;
 303         case SetPortFeature:
 304                 if (port >= uhci->rh_numports)
 305                         goto err;
 306
 307                 switch (wValue) {
 308                 case USB_PORT_FEAT_SUSPEND:
 309                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
 310                         OK(0);
 311                 case USB_PORT_FEAT_RESET:
 312                         SET_RH_PORTSTAT(USBPORTSC_PR);
 313
 314                         /* Reset terminates Resume signalling */
 315                         uhci_finish_suspend(uhci, port, port_addr);
 316
 317                         /* USB v2.0 7.1.7.5 */
 318                         uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
 319                         OK(0);
 320                 case USB_PORT_FEAT_POWER:
 321                         /* UHCI has no power switching */
 322                         OK(0);
 323                 default:
 324                         goto err;
 325                 }
 326                 break;
 327         case ClearPortFeature:
 328                 if (port >= uhci->rh_numports)
 329                         goto err;
 330
 331                 switch (wValue) {
 332                 case USB_PORT_FEAT_ENABLE:
 333                         CLR_RH_PORTSTAT(USBPORTSC_PE);
 334
 335                         /* Disable terminates Resume signalling */
 336                         uhci_finish_suspend(uhci, port, port_addr);
 337                         OK(0);
 338                 case USB_PORT_FEAT_C_ENABLE:
 339                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
 340                         OK(0);
 341                 case USB_PORT_FEAT_SUSPEND:
 342                         if (!(inw(port_addr) & USBPORTSC_SUSP)) {
 343
 344                                 /* Make certain the port isn't suspended */
 345                                 uhci_finish_suspend(uhci, port, port_addr);
 346                         } else if (!test_and_set_bit(port,
 347                                                 &uhci->resuming_ports)) {
 348                                 SET_RH_PORTSTAT(USBPORTSC_RD);
 349
 350                                 /* The controller won't allow RD to be set
 351                                  * if the port is disabled.  When this happens
 352                                  * just skip the Resume signalling.
 353                                  */
 354                                 if (!(inw(port_addr) & USBPORTSC_RD))
 355                                         uhci_finish_suspend(uhci, port,
 356                                                         port_addr);
 357                                 else
 358                                         /* USB v2.0 7.1.7.7 */
 359                                         uhci->ports_timeout = jiffies +
 360                                                 msecs_to_jiffies(20);
 361                         }
 362                         OK(0);
 363                 case USB_PORT_FEAT_C_SUSPEND:
 364                         clear_bit(port, &uhci->port_c_suspend);
 365                         OK(0);
 366                 case USB_PORT_FEAT_POWER:
 367                         /* UHCI has no power switching */
 368                         goto err;
 369                 case USB_PORT_FEAT_C_CONNECTION:
 370                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
 371                         OK(0);
 372                 case USB_PORT_FEAT_C_OVER_CURRENT:
 373                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
 374                         OK(0);
 375                 case USB_PORT_FEAT_C_RESET:
 376                         /* this driver won't report these */
 377                         OK(0);
 378                 default:
 379                         goto err;
 380                 }
 381                 break;
 382         case GetHubDescriptor:
 383                 len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
 384                 memcpy(buf, root_hub_hub_des, len);
 385                 if (len > 2)
 386                         buf[2] = uhci->rh_numports;
 387                 OK(len);
 388         default:
 389 err:
 390                 retval = -EPIPE;
 391         }
 392         spin_unlock_irqrestore(&uhci->lock, flags);
 393
 394         return retval;
 395 }