drivers/usb/host/xhci-hub.c

   1 /*
   2  * xHCI host controller driver
   3  *
   4  * Copyright (C) 2008 Intel Corp.
   5  *
   6  * Author: Sarah Sharp
   7  * Some code borrowed from the Linux EHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <asm/unaligned.h>
  24
  25 #include "xhci.h"
  26
  27 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  28 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  29                          PORT_RC | PORT_PLC | PORT_PE)
  30
  31 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
  32                 struct usb_hub_descriptor *desc, int ports)
  33 {
  34         u16 temp;
  35
  36         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
  37         desc->bHubContrCurrent = 0;
  38
  39         desc->bNbrPorts = ports;
  40         /* Ugh, these should be #defines, FIXME */
  41         /* Using table 11-13 in USB 2.0 spec. */
  42         temp = 0;
  43         /* Bits 1:0 - support port power switching, or power always on */
  44         if (HCC_PPC(xhci->hcc_params))
  45                 temp |= 0x0001;
  46         else
  47                 temp |= 0x0002;
  48         /* Bit  2 - root hubs are not part of a compound device */
  49         /* Bits 4:3 - individual port over current protection */
  50         temp |= 0x0008;
  51         /* Bits 6:5 - no TTs in root ports */
  52         /* Bit  7 - no port indicators */
  53         desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
  54 }
  55
  56 /* Fill in the USB 2.0 roothub descriptor */
  57 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
  58                 struct usb_hub_descriptor *desc)
  59 {
  60         int ports;
  61         u16 temp;
  62         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
  63         u32 portsc;
  64         unsigned int i;
  65
  66         ports = xhci->num_usb2_ports;
  67
  68         xhci_common_hub_descriptor(xhci, desc, ports);
  69         desc->bDescriptorType = 0x29;
  70         temp = 1 + (ports / 8);
  71         desc->bDescLength = 7 + 2 * temp;
  72
  73         /* The Device Removable bits are reported on a byte granularity.
  74          * If the port doesn't exist within that byte, the bit is set to 0.
  75          */
  76         memset(port_removable, 0, sizeof(port_removable));
  77         for (i = 0; i < ports; i++) {
  78                 portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
  79                 /* If a device is removable, PORTSC reports a 0, same as in the
  80                  * hub descriptor DeviceRemovable bits.
  81                  */
  82                 if (portsc & PORT_DEV_REMOVE)
  83                         /* This math is hairy because bit 0 of DeviceRemovable
  84                          * is reserved, and bit 1 is for port 1, etc.
  85                          */
  86                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
  87         }
  88
  89         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
  90          * ports on it.  The USB 2.0 specification says that there are two
  91          * variable length fields at the end of the hub descriptor:
  92          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
  93          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
  94          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
  95          * 0xFF, so we initialize the both arrays (DeviceRemovable and
  96          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
  97          * set of ports that actually exist.
  98          */
  99         memset(desc->u.hs.DeviceRemovable, 0xff,
 100                         sizeof(desc->u.hs.DeviceRemovable));
 101         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 102                         sizeof(desc->u.hs.PortPwrCtrlMask));
 103
 104         for (i = 0; i < (ports + 1 + 7) / 8; i++)
 105                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 106                                 sizeof(__u8));
 107 }
 108
 109 /* Fill in the USB 3.0 roothub descriptor */
 110 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 111                 struct usb_hub_descriptor *desc)
 112 {
 113         int ports;
 114         u16 port_removable;
 115         u32 portsc;
 116         unsigned int i;
 117
 118         ports = xhci->num_usb3_ports;
 119         xhci_common_hub_descriptor(xhci, desc, ports);
 120         desc->bDescriptorType = 0x2a;
 121         desc->bDescLength = 12;
 122
 123         /* header decode latency should be zero for roothubs,
 124          * see section 4.23.5.2.
 125          */
 126         desc->u.ss.bHubHdrDecLat = 0;
 127         desc->u.ss.wHubDelay = 0;
 128
 129         port_removable = 0;
 130         /* bit 0 is reserved, bit 1 is for port 1, etc. */
 131         for (i = 0; i < ports; i++) {
 132                 portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
 133                 if (portsc & PORT_DEV_REMOVE)
 134                         port_removable |= 1 << (i + 1);
 135         }
 136         memset(&desc->u.ss.DeviceRemovable,
 137                         (__force __u16) cpu_to_le16(port_removable),
 138                         sizeof(__u16));
 139 }
 140
 141 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 142                 struct usb_hub_descriptor *desc)
 143 {
 144
 145         if (hcd->speed == HCD_USB3)
 146                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
 147         else
 148                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
 149
 150 }
 151
 152 static unsigned int xhci_port_speed(unsigned int port_status)
 153 {
 154         if (DEV_LOWSPEED(port_status))
 155                 return USB_PORT_STAT_LOW_SPEED;
 156         if (DEV_HIGHSPEED(port_status))
 157                 return USB_PORT_STAT_HIGH_SPEED;
 158         if (DEV_SUPERSPEED(port_status))
 159                 return USB_PORT_STAT_SUPER_SPEED;
 160         /*
 161          * FIXME: Yes, we should check for full speed, but the core uses that as
 162          * a default in portspeed() in usb/core/hub.c (which is the only place
 163          * USB_PORT_STAT_*_SPEED is used).
 164          */
 165         return 0;
 166 }
 167
 168 /*
 169  * These bits are Read Only (RO) and should be saved and written to the
 170  * registers: 0, 3, 10:13, 30
 171  * connect status, over-current status, port speed, and device removable.
 172  * connect status and port speed are also sticky - meaning they're in
 173  * the AUX well and they aren't changed by a hot, warm, or cold reset.
 174  */
 175 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 176 /*
 177  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 178  * bits 5:8, 9, 14:15, 25:27
 179  * link state, port power, port indicator state, "wake on" enable state
 180  */
 181 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 182 /*
 183  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 184  * bit 4 (port reset)
 185  */
 186 #define XHCI_PORT_RW1S  ((1<<4))
 187 /*
 188  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 189  * bits 1, 17, 18, 19, 20, 21, 22, 23
 190  * port enable/disable, and
 191  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 192  * over-current, reset, link state, and L1 change
 193  */
 194 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 195 /*
 196  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 197  * latched in
 198  */
 199 #define XHCI_PORT_RW    ((1<<16))
 200 /*
 201  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 202  * bits 2, 24, 28:31
 203  */
 204 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 205
 206 /*
 207  * Given a port state, this function returns a value that would result in the
 208  * port being in the same state, if the value was written to the port status
 209  * control register.
 210  * Save Read Only (RO) bits and save read/write bits where
 211  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 212  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 213  */
 214 u32 xhci_port_state_to_neutral(u32 state)
 215 {
 216         /* Save read-only status and port state */
 217         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 218 }
 219
 220 /*
 221  * find slot id based on port number.
 222  * @port: The one-based port number from one of the two split roothubs.
 223  */
 224 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 225                 u16 port)
 226 {
 227         int slot_id;
 228         int i;
 229         enum usb_device_speed speed;
 230
 231         slot_id = 0;
 232         for (i = 0; i < MAX_HC_SLOTS; i++) {
 233                 if (!xhci->devs[i])
 234                         continue;
 235                 speed = xhci->devs[i]->udev->speed;
 236                 if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3))
 237                                 && xhci->devs[i]->port == port) {
 238                         slot_id = i;
 239                         break;
 240                 }
 241         }
 242
 243         return slot_id;
 244 }
 245
 246 /*
 247  * Stop device
 248  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 249  * to complete.
 250  * suspend will set to 1, if suspend bit need to set in command.
 251  */
 252 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 253 {
 254         struct xhci_virt_device *virt_dev;
 255         struct xhci_command *cmd;
 256         unsigned long flags;
 257         int timeleft;
 258         int ret;
 259         int i;
 260
 261         ret = 0;
 262         virt_dev = xhci->devs[slot_id];
 263         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
 264         if (!cmd) {
 265                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
 266                 return -ENOMEM;
 267         }
 268
 269         spin_lock_irqsave(&xhci->lock, flags);
 270         for (i = LAST_EP_INDEX; i > 0; i--) {
 271                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
 272                         xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
 273         }
 274         cmd->command_trb = xhci->cmd_ring->enqueue;
 275         list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
 276         xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
 277         xhci_ring_cmd_db(xhci);
 278         spin_unlock_irqrestore(&xhci->lock, flags);
 279
 280         /* Wait for last stop endpoint command to finish */
 281         timeleft = wait_for_completion_interruptible_timeout(
 282                         cmd->completion,
 283                         USB_CTRL_SET_TIMEOUT);
 284         if (timeleft <= 0) {
 285                 xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
 286                                 timeleft == 0 ? "Timeout" : "Signal");
 287                 spin_lock_irqsave(&xhci->lock, flags);
 288                 /* The timeout might have raced with the event ring handler, so
 289                  * only delete from the list if the item isn't poisoned.
 290                  */
 291                 if (cmd->cmd_list.next != LIST_POISON1)
 292                         list_del(&cmd->cmd_list);
 293                 spin_unlock_irqrestore(&xhci->lock, flags);
 294                 ret = -ETIME;
 295                 goto command_cleanup;
 296         }
 297
 298 command_cleanup:
 299         xhci_free_command(xhci, cmd);
 300         return ret;
 301 }
 302
 303 /*
 304  * Ring device, it rings the all doorbells unconditionally.
 305  */
 306 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 307 {
 308         int i;
 309
 310         for (i = 0; i < LAST_EP_INDEX + 1; i++)
 311                 if (xhci->devs[slot_id]->eps[i].ring &&
 312                     xhci->devs[slot_id]->eps[i].ring->dequeue)
 313                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 314
 315         return;
 316 }
 317
 318 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 319                 u16 wIndex, u32 __iomem *addr, u32 port_status)
 320 {
 321         /* Don't allow the USB core to disable SuperSpeed ports. */
 322         if (hcd->speed == HCD_USB3) {
 323                 xhci_dbg(xhci, "Ignoring request to disable "
 324                                 "SuperSpeed port.\n");
 325                 return;
 326         }
 327
 328         /* Write 1 to disable the port */
 329         xhci_writel(xhci, port_status | PORT_PE, addr);
 330         port_status = xhci_readl(xhci, addr);
 331         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 332                         wIndex, port_status);
 333 }
 334
 335 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 336                 u16 wIndex, u32 __iomem *addr, u32 port_status)
 337 {
 338         char *port_change_bit;
 339         u32 status;
 340
 341         switch (wValue) {
 342         case USB_PORT_FEAT_C_RESET:
 343                 status = PORT_RC;
 344                 port_change_bit = "reset";
 345                 break;
 346         case USB_PORT_FEAT_C_CONNECTION:
 347                 status = PORT_CSC;
 348                 port_change_bit = "connect";
 349                 break;
 350         case USB_PORT_FEAT_C_OVER_CURRENT:
 351                 status = PORT_OCC;
 352                 port_change_bit = "over-current";
 353                 break;
 354         case USB_PORT_FEAT_C_ENABLE:
 355                 status = PORT_PEC;
 356                 port_change_bit = "enable/disable";
 357                 break;
 358         case USB_PORT_FEAT_C_SUSPEND:
 359                 status = PORT_PLC;
 360                 port_change_bit = "suspend/resume";
 361                 break;
 362         default:
 363                 /* Should never happen */
 364                 return;
 365         }
 366         /* Change bits are all write 1 to clear */
 367         xhci_writel(xhci, port_status | status, addr);
 368         port_status = xhci_readl(xhci, addr);
 369         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 370                         port_change_bit, wIndex, port_status);
 371 }
 372
 373 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 374                 u16 wIndex, char *buf, u16 wLength)
 375 {
 376         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 377         int ports;
 378         unsigned long flags;
 379         u32 temp, temp1, status;
 380         int retval = 0;
 381         u32 __iomem **port_array;
 382         int slot_id;
 383         struct xhci_bus_state *bus_state;
 384
 385         if (hcd->speed == HCD_USB3) {
 386                 ports = xhci->num_usb3_ports;
 387                 port_array = xhci->usb3_ports;
 388         } else {
 389                 ports = xhci->num_usb2_ports;
 390                 port_array = xhci->usb2_ports;
 391         }
 392         bus_state = &xhci->bus_state[hcd_index(hcd)];
 393
 394         spin_lock_irqsave(&xhci->lock, flags);
 395         switch (typeReq) {
 396         case GetHubStatus:
 397                 /* No power source, over-current reported per port */
 398                 memset(buf, 0, 4);
 399                 break;
 400         case GetHubDescriptor:
 401                 /* Check to make sure userspace is asking for the USB 3.0 hub
 402                  * descriptor for the USB 3.0 roothub.  If not, we stall the
 403                  * endpoint, like external hubs do.
 404                  */
 405                 if (hcd->speed == HCD_USB3 &&
 406                                 (wLength < USB_DT_SS_HUB_SIZE ||
 407                                  wValue != (USB_DT_SS_HUB << 8))) {
 408                         xhci_dbg(xhci, "Wrong hub descriptor type for "
 409                                         "USB 3.0 roothub.\n");
 410                         goto error;
 411                 }
 412                 xhci_hub_descriptor(hcd, xhci,
 413                                 (struct usb_hub_descriptor *) buf);
 414                 break;
 415         case GetPortStatus:
 416                 if (!wIndex || wIndex > ports)
 417                         goto error;
 418                 wIndex--;
 419                 status = 0;
 420                 temp = xhci_readl(xhci, port_array[wIndex]);
 421                 if (temp == 0xffffffff) {
 422                         retval = -ENODEV;
 423                         break;
 424                 }
 425                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 426
 427                 /* FIXME - should we return a port status value like the USB
 428                  * 3.0 external hubs do?
 429                  */
 430                 /* wPortChange bits */
 431                 if (temp & PORT_CSC)
 432                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 433                 if (temp & PORT_PEC)
 434                         status |= USB_PORT_STAT_C_ENABLE << 16;
 435                 if ((temp & PORT_OCC))
 436                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 437                 /*
 438                  * FIXME ignoring reset and USB 2.1/3.0 specific
 439                  * changes
 440                  */
 441                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 442                         && (temp & PORT_POWER))
 443                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 444                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 445                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 446                                 goto error;
 447                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 448                                                 bus_state->resume_done[wIndex])) {
 449                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 450                                         wIndex + 1);
 451                                 bus_state->resume_done[wIndex] = 0;
 452                                 temp1 = xhci_port_state_to_neutral(temp);
 453                                 temp1 &= ~PORT_PLS_MASK;
 454                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 455                                 xhci_writel(xhci, temp1, port_array[wIndex]);
 456
 457                                 xhci_dbg(xhci, "set port %d resume\n",
 458                                         wIndex + 1);
 459                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 460                                                                  wIndex + 1);
 461                                 if (!slot_id) {
 462                                         xhci_dbg(xhci, "slot_id is zero\n");
 463                                         goto error;
 464                                 }
 465                                 xhci_ring_device(xhci, slot_id);
 466                                 bus_state->port_c_suspend |= 1 << wIndex;
 467                                 bus_state->suspended_ports &= ~(1 << wIndex);
 468                         }
 469                 }
 470                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 471                         && (temp & PORT_POWER)
 472                         && (bus_state->suspended_ports & (1 << wIndex))) {
 473                         bus_state->suspended_ports &= ~(1 << wIndex);
 474                         bus_state->port_c_suspend |= 1 << wIndex;
 475                 }
 476                 if (temp & PORT_CONNECT) {
 477                         status |= USB_PORT_STAT_CONNECTION;
 478                         status |= xhci_port_speed(temp);
 479                 }
 480                 if (temp & PORT_PE)
 481                         status |= USB_PORT_STAT_ENABLE;
 482                 if (temp & PORT_OC)
 483                         status |= USB_PORT_STAT_OVERCURRENT;
 484                 if (temp & PORT_RESET)
 485                         status |= USB_PORT_STAT_RESET;
 486                 if (temp & PORT_POWER)
 487                         status |= USB_PORT_STAT_POWER;
 488                 if (bus_state->port_c_suspend & (1 << wIndex))
 489                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 490                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 491                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 492                 break;
 493         case SetPortFeature:
 494                 wIndex &= 0xff;
 495                 if (!wIndex || wIndex > ports)
 496                         goto error;
 497                 wIndex--;
 498                 temp = xhci_readl(xhci, port_array[wIndex]);
 499                 if (temp == 0xffffffff) {
 500                         retval = -ENODEV;
 501                         break;
 502                 }
 503                 temp = xhci_port_state_to_neutral(temp);
 504                 /* FIXME: What new port features do we need to support? */
 505                 switch (wValue) {
 506                 case USB_PORT_FEAT_SUSPEND:
 507                         temp = xhci_readl(xhci, port_array[wIndex]);
 508                         /* In spec software should not attempt to suspend
 509                          * a port unless the port reports that it is in the
 510                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 511                          */
 512                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 513                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 514                                 xhci_warn(xhci, "USB core suspending device "
 515                                           "not in U0/U1/U2.\n");
 516                                 goto error;
 517                         }
 518
 519                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 520                                         wIndex + 1);
 521                         if (!slot_id) {
 522                                 xhci_warn(xhci, "slot_id is zero\n");
 523                                 goto error;
 524                         }
 525                         /* unlock to execute stop endpoint commands */
 526                         spin_unlock_irqrestore(&xhci->lock, flags);
 527                         xhci_stop_device(xhci, slot_id, 1);
 528                         spin_lock_irqsave(&xhci->lock, flags);
 529
 530                         temp = xhci_port_state_to_neutral(temp);
 531                         temp &= ~PORT_PLS_MASK;
 532                         temp |= PORT_LINK_STROBE | XDEV_U3;
 533                         xhci_writel(xhci, temp, port_array[wIndex]);
 534
 535                         spin_unlock_irqrestore(&xhci->lock, flags);
 536                         msleep(10); /* wait device to enter */
 537                         spin_lock_irqsave(&xhci->lock, flags);
 538
 539                         temp = xhci_readl(xhci, port_array[wIndex]);
 540                         bus_state->suspended_ports |= 1 << wIndex;
 541                         break;
 542                 case USB_PORT_FEAT_POWER:
 543                         /*
 544                          * Turn on ports, even if there isn't per-port switching.
 545                          * HC will report connect events even before this is set.
 546                          * However, khubd will ignore the roothub events until
 547                          * the roothub is registered.
 548                          */
 549                         xhci_writel(xhci, temp | PORT_POWER,
 550                                         port_array[wIndex]);
 551
 552                         temp = xhci_readl(xhci, port_array[wIndex]);
 553                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 554                         break;
 555                 case USB_PORT_FEAT_RESET:
 556                         temp = (temp | PORT_RESET);
 557                         xhci_writel(xhci, temp, port_array[wIndex]);
 558
 559                         temp = xhci_readl(xhci, port_array[wIndex]);
 560                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 561                         break;
 562                 default:
 563                         goto error;
 564                 }
 565                 /* unblock any posted writes */
 566                 temp = xhci_readl(xhci, port_array[wIndex]);
 567                 break;
 568         case ClearPortFeature:
 569                 if (!wIndex || wIndex > ports)
 570                         goto error;
 571                 wIndex--;
 572                 temp = xhci_readl(xhci, port_array[wIndex]);
 573                 if (temp == 0xffffffff) {
 574                         retval = -ENODEV;
 575                         break;
 576                 }
 577                 /* FIXME: What new port features do we need to support? */
 578                 temp = xhci_port_state_to_neutral(temp);
 579                 switch (wValue) {
 580                 case USB_PORT_FEAT_SUSPEND:
 581                         temp = xhci_readl(xhci, port_array[wIndex]);
 582                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 583                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 584                         if (temp & PORT_RESET)
 585                                 goto error;
 586                         if (temp & XDEV_U3) {
 587                                 if ((temp & PORT_PE) == 0)
 588                                         goto error;
 589                                 if (DEV_SUPERSPEED(temp)) {
 590                                         temp = xhci_port_state_to_neutral(temp);
 591                                         temp &= ~PORT_PLS_MASK;
 592                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 593                                         xhci_writel(xhci, temp,
 594                                                         port_array[wIndex]);
 595                                         xhci_readl(xhci, port_array[wIndex]);
 596                                 } else {
 597                                         temp = xhci_port_state_to_neutral(temp);
 598                                         temp &= ~PORT_PLS_MASK;
 599                                         temp |= PORT_LINK_STROBE | XDEV_RESUME;
 600                                         xhci_writel(xhci, temp,
 601                                                         port_array[wIndex]);
 602
 603                                         spin_unlock_irqrestore(&xhci->lock,
 604                                                                flags);
 605                                         msleep(20);
 606                                         spin_lock_irqsave(&xhci->lock, flags);
 607
 608                                         temp = xhci_readl(xhci,
 609                                                         port_array[wIndex]);
 610                                         temp = xhci_port_state_to_neutral(temp);
 611                                         temp &= ~PORT_PLS_MASK;
 612                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 613                                         xhci_writel(xhci, temp,
 614                                                         port_array[wIndex]);
 615                                 }
 616                                 bus_state->port_c_suspend |= 1 << wIndex;
 617                         }
 618
 619                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 620                                         wIndex + 1);
 621                         if (!slot_id) {
 622                                 xhci_dbg(xhci, "slot_id is zero\n");
 623                                 goto error;
 624                         }
 625                         xhci_ring_device(xhci, slot_id);
 626                         break;
 627                 case USB_PORT_FEAT_C_SUSPEND:
 628                         bus_state->port_c_suspend &= ~(1 << wIndex);
 629                 case USB_PORT_FEAT_C_RESET:
 630                 case USB_PORT_FEAT_C_CONNECTION:
 631                 case USB_PORT_FEAT_C_OVER_CURRENT:
 632                 case USB_PORT_FEAT_C_ENABLE:
 633                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 634                                         port_array[wIndex], temp);
 635                         break;
 636                 case USB_PORT_FEAT_ENABLE:
 637                         xhci_disable_port(hcd, xhci, wIndex,
 638                                         port_array[wIndex], temp);
 639                         break;
 640                 default:
 641                         goto error;
 642                 }
 643                 break;
 644         default:
 645 error:
 646                 /* "stall" on error */
 647                 retval = -EPIPE;
 648         }
 649         spin_unlock_irqrestore(&xhci->lock, flags);
 650         return retval;
 651 }
 652
 653 /*
 654  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 655  * Ports are 0-indexed from the HCD point of view,
 656  * and 1-indexed from the USB core pointer of view.
 657  *
 658  * Note that the status change bits will be cleared as soon as a port status
 659  * change event is generated, so we use the saved status from that event.
 660  */
 661 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 662 {
 663         unsigned long flags;
 664         u32 temp, status;
 665         u32 mask;
 666         int i, retval;
 667         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 668         int ports;
 669         u32 __iomem **port_array;
 670         struct xhci_bus_state *bus_state;
 671
 672         if (hcd->speed == HCD_USB3) {
 673                 ports = xhci->num_usb3_ports;
 674                 port_array = xhci->usb3_ports;
 675         } else {
 676                 ports = xhci->num_usb2_ports;
 677                 port_array = xhci->usb2_ports;
 678         }
 679         bus_state = &xhci->bus_state[hcd_index(hcd)];
 680
 681         /* Initial status is no changes */
 682         retval = (ports + 8) / 8;
 683         memset(buf, 0, retval);
 684         status = 0;
 685
 686         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 687
 688         spin_lock_irqsave(&xhci->lock, flags);
 689         /* For each port, did anything change?  If so, set that bit in buf. */
 690         for (i = 0; i < ports; i++) {
 691                 temp = xhci_readl(xhci, port_array[i]);
 692                 if (temp == 0xffffffff) {
 693                         retval = -ENODEV;
 694                         break;
 695                 }
 696                 if ((temp & mask) != 0 ||
 697                         (bus_state->port_c_suspend & 1 << i) ||
 698                         (bus_state->resume_done[i] && time_after_eq(
 699                             jiffies, bus_state->resume_done[i]))) {
 700                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 701                         status = 1;
 702                 }
 703         }
 704         spin_unlock_irqrestore(&xhci->lock, flags);
 705         return status ? retval : 0;
 706 }
 707
 708 #ifdef CONFIG_PM
 709
 710 int xhci_bus_suspend(struct usb_hcd *hcd)
 711 {
 712         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 713         int max_ports, port_index;
 714         u32 __iomem **port_array;
 715         struct xhci_bus_state *bus_state;
 716         unsigned long flags;
 717
 718         if (hcd->speed == HCD_USB3) {
 719                 max_ports = xhci->num_usb3_ports;
 720                 port_array = xhci->usb3_ports;
 721                 xhci_dbg(xhci, "suspend USB 3.0 root hub\n");
 722         } else {
 723                 max_ports = xhci->num_usb2_ports;
 724                 port_array = xhci->usb2_ports;
 725                 xhci_dbg(xhci, "suspend USB 2.0 root hub\n");
 726         }
 727         bus_state = &xhci->bus_state[hcd_index(hcd)];
 728
 729         spin_lock_irqsave(&xhci->lock, flags);
 730
 731         if (hcd->self.root_hub->do_remote_wakeup) {
 732                 port_index = max_ports;
 733                 while (port_index--) {
 734                         if (bus_state->resume_done[port_index] != 0) {
 735                                 spin_unlock_irqrestore(&xhci->lock, flags);
 736                                 xhci_dbg(xhci, "suspend failed because "
 737                                                 "port %d is resuming\n",
 738                                                 port_index + 1);
 739                                 return -EBUSY;
 740                         }
 741                 }
 742         }
 743
 744         port_index = max_ports;
 745         bus_state->bus_suspended = 0;
 746         while (port_index--) {
 747                 /* suspend the port if the port is not suspended */
 748                 u32 t1, t2;
 749                 int slot_id;
 750
 751                 t1 = xhci_readl(xhci, port_array[port_index]);
 752                 t2 = xhci_port_state_to_neutral(t1);
 753
 754                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 755                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
 756                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 757                                         port_index + 1);
 758                         if (slot_id) {
 759                                 spin_unlock_irqrestore(&xhci->lock, flags);
 760                                 xhci_stop_device(xhci, slot_id, 1);
 761                                 spin_lock_irqsave(&xhci->lock, flags);
 762                         }
 763                         t2 &= ~PORT_PLS_MASK;
 764                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 765                         set_bit(port_index, &bus_state->bus_suspended);
 766                 }
 767                 if (hcd->self.root_hub->do_remote_wakeup) {
 768                         if (t1 & PORT_CONNECT) {
 769                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 770                                 t2 &= ~PORT_WKCONN_E;
 771                         } else {
 772                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 773                                 t2 &= ~PORT_WKDISC_E;
 774                         }
 775                 } else
 776                         t2 &= ~PORT_WAKE_BITS;
 777
 778                 t1 = xhci_port_state_to_neutral(t1);
 779                 if (t1 != t2)
 780                         xhci_writel(xhci, t2, port_array[port_index]);
 781
 782                 if (DEV_HIGHSPEED(t1)) {
 783                         /* enable remote wake up for USB 2.0 */
 784                         u32 __iomem *addr;
 785                         u32 tmp;
 786
 787                         /* Add one to the port status register address to get
 788                          * the port power control register address.
 789                          */
 790                         addr = port_array[port_index] + 1;
 791                         tmp = xhci_readl(xhci, addr);
 792                         tmp |= PORT_RWE;
 793                         xhci_writel(xhci, tmp, addr);
 794                 }
 795         }
 796         hcd->state = HC_STATE_SUSPENDED;
 797         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
 798         spin_unlock_irqrestore(&xhci->lock, flags);
 799         return 0;
 800 }
 801
 802 int xhci_bus_resume(struct usb_hcd *hcd)
 803 {
 804         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 805         int max_ports, port_index;
 806         u32 __iomem **port_array;
 807         struct xhci_bus_state *bus_state;
 808         u32 temp;
 809         unsigned long flags;
 810
 811         if (hcd->speed == HCD_USB3) {
 812                 max_ports = xhci->num_usb3_ports;
 813                 port_array = xhci->usb3_ports;
 814                 xhci_dbg(xhci, "resume USB 3.0 root hub\n");
 815         } else {
 816                 max_ports = xhci->num_usb2_ports;
 817                 port_array = xhci->usb2_ports;
 818                 xhci_dbg(xhci, "resume USB 2.0 root hub\n");
 819         }
 820         bus_state = &xhci->bus_state[hcd_index(hcd)];
 821
 822         if (time_before(jiffies, bus_state->next_statechange))
 823                 msleep(5);
 824
 825         spin_lock_irqsave(&xhci->lock, flags);
 826         if (!HCD_HW_ACCESSIBLE(hcd)) {
 827                 spin_unlock_irqrestore(&xhci->lock, flags);
 828                 return -ESHUTDOWN;
 829         }
 830
 831         /* delay the irqs */
 832         temp = xhci_readl(xhci, &xhci->op_regs->command);
 833         temp &= ~CMD_EIE;
 834         xhci_writel(xhci, temp, &xhci->op_regs->command);
 835
 836         port_index = max_ports;
 837         while (port_index--) {
 838                 /* Check whether need resume ports. If needed
 839                    resume port and disable remote wakeup */
 840                 u32 temp;
 841                 int slot_id;
 842
 843                 temp = xhci_readl(xhci, port_array[port_index]);
 844                 if (DEV_SUPERSPEED(temp))
 845                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 846                 else
 847                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 848                 if (test_bit(port_index, &bus_state->bus_suspended) &&
 849                     (temp & PORT_PLS_MASK)) {
 850                         if (DEV_SUPERSPEED(temp)) {
 851                                 temp = xhci_port_state_to_neutral(temp);
 852                                 temp &= ~PORT_PLS_MASK;
 853                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 854                                 xhci_writel(xhci, temp, port_array[port_index]);
 855                         } else {
 856                                 temp = xhci_port_state_to_neutral(temp);
 857                                 temp &= ~PORT_PLS_MASK;
 858                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 859                                 xhci_writel(xhci, temp, port_array[port_index]);
 860
 861                                 spin_unlock_irqrestore(&xhci->lock, flags);
 862                                 msleep(20);
 863                                 spin_lock_irqsave(&xhci->lock, flags);
 864
 865                                 temp = xhci_readl(xhci, port_array[port_index]);
 866                                 temp = xhci_port_state_to_neutral(temp);
 867                                 temp &= ~PORT_PLS_MASK;
 868                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 869                                 xhci_writel(xhci, temp, port_array[port_index]);
 870                         }
 871                         slot_id = xhci_find_slot_id_by_port(hcd,
 872                                         xhci, port_index + 1);
 873                         if (slot_id)
 874                                 xhci_ring_device(xhci, slot_id);
 875                 } else
 876                         xhci_writel(xhci, temp, port_array[port_index]);
 877
 878                 if (DEV_HIGHSPEED(temp)) {
 879                         /* disable remote wake up for USB 2.0 */
 880                         u32 __iomem *addr;
 881                         u32 tmp;
 882
 883                         /* Add one to the port status register address to get
 884                          * the port power control register address.
 885                          */
 886                         addr = port_array[port_index] + 1;
 887                         tmp = xhci_readl(xhci, addr);
 888                         tmp &= ~PORT_RWE;
 889                         xhci_writel(xhci, tmp, addr);
 890                 }
 891         }
 892
 893         (void) xhci_readl(xhci, &xhci->op_regs->command);
 894
 895         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
 896         /* re-enable irqs */
 897         temp = xhci_readl(xhci, &xhci->op_regs->command);
 898         temp |= CMD_EIE;
 899         xhci_writel(xhci, temp, &xhci->op_regs->command);
 900         temp = xhci_readl(xhci, &xhci->op_regs->command);
 901
 902         spin_unlock_irqrestore(&xhci->lock, flags);
 903         return 0;
 904 }
 905
 906 #endif  /* CONFIG_PM */