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_hub_descriptor(struct xhci_hcd *xhci,
  32                 struct usb_hub_descriptor *desc)
  33 {
  34         int ports;
  35         u16 temp;
  36
  37         ports = HCS_MAX_PORTS(xhci->hcs_params1);
  38
  39         /* USB 3.0 hubs have a different descriptor, but we fake this for now */
  40         desc->bDescriptorType = 0x29;
  41         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
  42         desc->bHubContrCurrent = 0;
  43
  44         desc->bNbrPorts = ports;
  45         temp = 1 + (ports / 8);
  46         desc->bDescLength = 7 + 2 * temp;
  47
  48         memset(&desc->DeviceRemovable[0], 0, temp);
  49         memset(&desc->DeviceRemovable[temp], 0xff, temp);
  50
  51         /* Ugh, these should be #defines, FIXME */
  52         /* Using table 11-13 in USB 2.0 spec. */
  53         temp = 0;
  54         /* Bits 1:0 - support port power switching, or power always on */
  55         if (HCC_PPC(xhci->hcc_params))
  56                 temp |= 0x0001;
  57         else
  58                 temp |= 0x0002;
  59         /* Bit  2 - root hubs are not part of a compound device */
  60         /* Bits 4:3 - individual port over current protection */
  61         temp |= 0x0008;
  62         /* Bits 6:5 - no TTs in root ports */
  63         /* Bit  7 - no port indicators */
  64         desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
  65 }
  66
  67 static unsigned int xhci_port_speed(unsigned int port_status)
  68 {
  69         if (DEV_LOWSPEED(port_status))
  70                 return USB_PORT_STAT_LOW_SPEED;
  71         if (DEV_HIGHSPEED(port_status))
  72                 return USB_PORT_STAT_HIGH_SPEED;
  73         if (DEV_SUPERSPEED(port_status))
  74                 return USB_PORT_STAT_SUPER_SPEED;
  75         /*
  76          * FIXME: Yes, we should check for full speed, but the core uses that as
  77          * a default in portspeed() in usb/core/hub.c (which is the only place
  78          * USB_PORT_STAT_*_SPEED is used).
  79          */
  80         return 0;
  81 }
  82
  83 /*
  84  * These bits are Read Only (RO) and should be saved and written to the
  85  * registers: 0, 3, 10:13, 30
  86  * connect status, over-current status, port speed, and device removable.
  87  * connect status and port speed are also sticky - meaning they're in
  88  * the AUX well and they aren't changed by a hot, warm, or cold reset.
  89  */
  90 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
  91 /*
  92  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
  93  * bits 5:8, 9, 14:15, 25:27
  94  * link state, port power, port indicator state, "wake on" enable state
  95  */
  96 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
  97 /*
  98  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
  99  * bit 4 (port reset)
 100  */
 101 #define XHCI_PORT_RW1S  ((1<<4))
 102 /*
 103  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 104  * bits 1, 17, 18, 19, 20, 21, 22, 23
 105  * port enable/disable, and
 106  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 107  * over-current, reset, link state, and L1 change
 108  */
 109 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 110 /*
 111  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 112  * latched in
 113  */
 114 #define XHCI_PORT_RW    ((1<<16))
 115 /*
 116  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 117  * bits 2, 24, 28:31
 118  */
 119 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 120
 121 /*
 122  * Given a port state, this function returns a value that would result in the
 123  * port being in the same state, if the value was written to the port status
 124  * control register.
 125  * Save Read Only (RO) bits and save read/write bits where
 126  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 127  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 128  */
 129 u32 xhci_port_state_to_neutral(u32 state)
 130 {
 131         /* Save read-only status and port state */
 132         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 133 }
 134
 135 /*
 136  * find slot id based on port number.
 137  */
 138 int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
 139 {
 140         int slot_id;
 141         int i;
 142
 143         slot_id = 0;
 144         for (i = 0; i < MAX_HC_SLOTS; i++) {
 145                 if (!xhci->devs[i])
 146                         continue;
 147                 if (xhci->devs[i]->port == port) {
 148                         slot_id = i;
 149                         break;
 150                 }
 151         }
 152
 153         return slot_id;
 154 }
 155
 156 /*
 157  * Stop device
 158  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 159  * to complete.
 160  * suspend will set to 1, if suspend bit need to set in command.
 161  */
 162 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 163 {
 164         struct xhci_virt_device *virt_dev;
 165         struct xhci_command *cmd;
 166         unsigned long flags;
 167         int timeleft;
 168         int ret;
 169         int i;
 170
 171         ret = 0;
 172         virt_dev = xhci->devs[slot_id];
 173         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
 174         if (!cmd) {
 175                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
 176                 return -ENOMEM;
 177         }
 178
 179         spin_lock_irqsave(&xhci->lock, flags);
 180         for (i = LAST_EP_INDEX; i > 0; i--) {
 181                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
 182                         xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
 183         }
 184         cmd->command_trb = xhci->cmd_ring->enqueue;
 185         list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
 186         xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
 187         xhci_ring_cmd_db(xhci);
 188         spin_unlock_irqrestore(&xhci->lock, flags);
 189
 190         /* Wait for last stop endpoint command to finish */
 191         timeleft = wait_for_completion_interruptible_timeout(
 192                         cmd->completion,
 193                         USB_CTRL_SET_TIMEOUT);
 194         if (timeleft <= 0) {
 195                 xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
 196                                 timeleft == 0 ? "Timeout" : "Signal");
 197                 spin_lock_irqsave(&xhci->lock, flags);
 198                 /* The timeout might have raced with the event ring handler, so
 199                  * only delete from the list if the item isn't poisoned.
 200                  */
 201                 if (cmd->cmd_list.next != LIST_POISON1)
 202                         list_del(&cmd->cmd_list);
 203                 spin_unlock_irqrestore(&xhci->lock, flags);
 204                 ret = -ETIME;
 205                 goto command_cleanup;
 206         }
 207
 208 command_cleanup:
 209         xhci_free_command(xhci, cmd);
 210         return ret;
 211 }
 212
 213 /*
 214  * Ring device, it rings the all doorbells unconditionally.
 215  */
 216 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 217 {
 218         int i;
 219
 220         for (i = 0; i < LAST_EP_INDEX + 1; i++)
 221                 if (xhci->devs[slot_id]->eps[i].ring &&
 222                     xhci->devs[slot_id]->eps[i].ring->dequeue)
 223                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 224
 225         return;
 226 }
 227
 228 static void xhci_disable_port(struct xhci_hcd *xhci, u16 wIndex,
 229                 u32 __iomem *addr, u32 port_status)
 230 {
 231         /* Don't allow the USB core to disable SuperSpeed ports. */
 232         if (xhci->port_array[wIndex] == 0x03) {
 233                 xhci_dbg(xhci, "Ignoring request to disable "
 234                                 "SuperSpeed port.\n");
 235                 return;
 236         }
 237
 238         /* Write 1 to disable the port */
 239         xhci_writel(xhci, port_status | PORT_PE, addr);
 240         port_status = xhci_readl(xhci, addr);
 241         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 242                         wIndex, port_status);
 243 }
 244
 245 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 246                 u16 wIndex, u32 __iomem *addr, u32 port_status)
 247 {
 248         char *port_change_bit;
 249         u32 status;
 250
 251         switch (wValue) {
 252         case USB_PORT_FEAT_C_RESET:
 253                 status = PORT_RC;
 254                 port_change_bit = "reset";
 255                 break;
 256         case USB_PORT_FEAT_C_CONNECTION:
 257                 status = PORT_CSC;
 258                 port_change_bit = "connect";
 259                 break;
 260         case USB_PORT_FEAT_C_OVER_CURRENT:
 261                 status = PORT_OCC;
 262                 port_change_bit = "over-current";
 263                 break;
 264         case USB_PORT_FEAT_C_ENABLE:
 265                 status = PORT_PEC;
 266                 port_change_bit = "enable/disable";
 267                 break;
 268         case USB_PORT_FEAT_C_SUSPEND:
 269                 status = PORT_PLC;
 270                 port_change_bit = "suspend/resume";
 271                 break;
 272         default:
 273                 /* Should never happen */
 274                 return;
 275         }
 276         /* Change bits are all write 1 to clear */
 277         xhci_writel(xhci, port_status | status, addr);
 278         port_status = xhci_readl(xhci, addr);
 279         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 280                         port_change_bit, wIndex, port_status);
 281 }
 282
 283 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 284                 u16 wIndex, char *buf, u16 wLength)
 285 {
 286         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 287         int ports;
 288         unsigned long flags;
 289         u32 temp, temp1, status;
 290         int retval = 0;
 291         u32 __iomem *addr;
 292         int slot_id;
 293
 294         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 295
 296         spin_lock_irqsave(&xhci->lock, flags);
 297         switch (typeReq) {
 298         case GetHubStatus:
 299                 /* No power source, over-current reported per port */
 300                 memset(buf, 0, 4);
 301                 break;
 302         case GetHubDescriptor:
 303                 xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
 304                 break;
 305         case GetPortStatus:
 306                 if (!wIndex || wIndex > ports)
 307                         goto error;
 308                 wIndex--;
 309                 status = 0;
 310                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 311                 temp = xhci_readl(xhci, addr);
 312                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 313
 314                 /* wPortChange bits */
 315                 if (temp & PORT_CSC)
 316                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 317                 if (temp & PORT_PEC)
 318                         status |= USB_PORT_STAT_C_ENABLE << 16;
 319                 if ((temp & PORT_OCC))
 320                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 321                 /*
 322                  * FIXME ignoring reset and USB 2.1/3.0 specific
 323                  * changes
 324                  */
 325                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 326                         && (temp & PORT_POWER))
 327                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 328                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 329                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 330                                 goto error;
 331                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 332                                                 xhci->resume_done[wIndex])) {
 333                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 334                                         wIndex + 1);
 335                                 xhci->resume_done[wIndex] = 0;
 336                                 temp1 = xhci_port_state_to_neutral(temp);
 337                                 temp1 &= ~PORT_PLS_MASK;
 338                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 339                                 xhci_writel(xhci, temp1, addr);
 340
 341                                 xhci_dbg(xhci, "set port %d resume\n",
 342                                         wIndex + 1);
 343                                 slot_id = xhci_find_slot_id_by_port(xhci,
 344                                                                  wIndex + 1);
 345                                 if (!slot_id) {
 346                                         xhci_dbg(xhci, "slot_id is zero\n");
 347                                         goto error;
 348                                 }
 349                                 xhci_ring_device(xhci, slot_id);
 350                                 xhci->port_c_suspend |= 1 << wIndex;
 351                                 xhci->suspended_ports &= ~(1 << wIndex);
 352                         }
 353                 }
 354                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 355                         && (temp & PORT_POWER)
 356                         && (xhci->suspended_ports & (1 << wIndex))) {
 357                         xhci->suspended_ports &= ~(1 << wIndex);
 358                         xhci->port_c_suspend |= 1 << wIndex;
 359                 }
 360                 if (temp & PORT_CONNECT) {
 361                         status |= USB_PORT_STAT_CONNECTION;
 362                         status |= xhci_port_speed(temp);
 363                 }
 364                 if (temp & PORT_PE)
 365                         status |= USB_PORT_STAT_ENABLE;
 366                 if (temp & PORT_OC)
 367                         status |= USB_PORT_STAT_OVERCURRENT;
 368                 if (temp & PORT_RESET)
 369                         status |= USB_PORT_STAT_RESET;
 370                 if (temp & PORT_POWER)
 371                         status |= USB_PORT_STAT_POWER;
 372                 if (xhci->port_c_suspend & (1 << wIndex))
 373                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 374                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 375                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 376                 break;
 377         case SetPortFeature:
 378                 wIndex &= 0xff;
 379                 if (!wIndex || wIndex > ports)
 380                         goto error;
 381                 wIndex--;
 382                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 383                 temp = xhci_readl(xhci, addr);
 384                 temp = xhci_port_state_to_neutral(temp);
 385                 switch (wValue) {
 386                 case USB_PORT_FEAT_SUSPEND:
 387                         temp = xhci_readl(xhci, addr);
 388                         /* In spec software should not attempt to suspend
 389                          * a port unless the port reports that it is in the
 390                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 391                          */
 392                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 393                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 394                                 xhci_warn(xhci, "USB core suspending device "
 395                                           "not in U0/U1/U2.\n");
 396                                 goto error;
 397                         }
 398
 399                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 400                         if (!slot_id) {
 401                                 xhci_warn(xhci, "slot_id is zero\n");
 402                                 goto error;
 403                         }
 404                         /* unlock to execute stop endpoint commands */
 405                         spin_unlock_irqrestore(&xhci->lock, flags);
 406                         xhci_stop_device(xhci, slot_id, 1);
 407                         spin_lock_irqsave(&xhci->lock, flags);
 408
 409                         temp = xhci_port_state_to_neutral(temp);
 410                         temp &= ~PORT_PLS_MASK;
 411                         temp |= PORT_LINK_STROBE | XDEV_U3;
 412                         xhci_writel(xhci, temp, addr);
 413
 414                         spin_unlock_irqrestore(&xhci->lock, flags);
 415                         msleep(10); /* wait device to enter */
 416                         spin_lock_irqsave(&xhci->lock, flags);
 417
 418                         temp = xhci_readl(xhci, addr);
 419                         xhci->suspended_ports |= 1 << wIndex;
 420                         break;
 421                 case USB_PORT_FEAT_POWER:
 422                         /*
 423                          * Turn on ports, even if there isn't per-port switching.
 424                          * HC will report connect events even before this is set.
 425                          * However, khubd will ignore the roothub events until
 426                          * the roothub is registered.
 427                          */
 428                         xhci_writel(xhci, temp | PORT_POWER, addr);
 429
 430                         temp = xhci_readl(xhci, addr);
 431                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 432                         break;
 433                 case USB_PORT_FEAT_RESET:
 434                         temp = (temp | PORT_RESET);
 435                         xhci_writel(xhci, temp, addr);
 436
 437                         temp = xhci_readl(xhci, addr);
 438                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 439                         break;
 440                 default:
 441                         goto error;
 442                 }
 443                 temp = xhci_readl(xhci, addr); /* unblock any posted writes */
 444                 break;
 445         case ClearPortFeature:
 446                 if (!wIndex || wIndex > ports)
 447                         goto error;
 448                 wIndex--;
 449                 addr = &xhci->op_regs->port_status_base +
 450                         NUM_PORT_REGS*(wIndex & 0xff);
 451                 temp = xhci_readl(xhci, addr);
 452                 temp = xhci_port_state_to_neutral(temp);
 453                 switch (wValue) {
 454                 case USB_PORT_FEAT_SUSPEND:
 455                         temp = xhci_readl(xhci, addr);
 456                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 457                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 458                         if (temp & PORT_RESET)
 459                                 goto error;
 460                         if (temp & XDEV_U3) {
 461                                 if ((temp & PORT_PE) == 0)
 462                                         goto error;
 463                                 if (DEV_SUPERSPEED(temp)) {
 464                                         temp = xhci_port_state_to_neutral(temp);
 465                                         temp &= ~PORT_PLS_MASK;
 466                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 467                                         xhci_writel(xhci, temp, addr);
 468                                         xhci_readl(xhci, addr);
 469                                 } else {
 470                                         temp = xhci_port_state_to_neutral(temp);
 471                                         temp &= ~PORT_PLS_MASK;
 472                                         temp |= PORT_LINK_STROBE | XDEV_RESUME;
 473                                         xhci_writel(xhci, temp, addr);
 474
 475                                         spin_unlock_irqrestore(&xhci->lock,
 476                                                                flags);
 477                                         msleep(20);
 478                                         spin_lock_irqsave(&xhci->lock, flags);
 479
 480                                         temp = xhci_readl(xhci, addr);
 481                                         temp = xhci_port_state_to_neutral(temp);
 482                                         temp &= ~PORT_PLS_MASK;
 483                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 484                                         xhci_writel(xhci, temp, addr);
 485                                 }
 486                                 xhci->port_c_suspend |= 1 << wIndex;
 487                         }
 488
 489                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 490                         if (!slot_id) {
 491                                 xhci_dbg(xhci, "slot_id is zero\n");
 492                                 goto error;
 493                         }
 494                         xhci_ring_device(xhci, slot_id);
 495                         break;
 496                 case USB_PORT_FEAT_C_SUSPEND:
 497                         xhci->port_c_suspend &= ~(1 << wIndex);
 498                 case USB_PORT_FEAT_C_RESET:
 499                 case USB_PORT_FEAT_C_CONNECTION:
 500                 case USB_PORT_FEAT_C_OVER_CURRENT:
 501                 case USB_PORT_FEAT_C_ENABLE:
 502                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 503                                         addr, temp);
 504                         break;
 505                 case USB_PORT_FEAT_ENABLE:
 506                         xhci_disable_port(xhci, wIndex, addr, temp);
 507                         break;
 508                 default:
 509                         goto error;
 510                 }
 511                 break;
 512         default:
 513 error:
 514                 /* "stall" on error */
 515                 retval = -EPIPE;
 516         }
 517         spin_unlock_irqrestore(&xhci->lock, flags);
 518         return retval;
 519 }
 520
 521 /*
 522  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 523  * Ports are 0-indexed from the HCD point of view,
 524  * and 1-indexed from the USB core pointer of view.
 525  *
 526  * Note that the status change bits will be cleared as soon as a port status
 527  * change event is generated, so we use the saved status from that event.
 528  */
 529 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 530 {
 531         unsigned long flags;
 532         u32 temp, status;
 533         u32 mask;
 534         int i, retval;
 535         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 536         int ports;
 537         u32 __iomem *addr;
 538
 539         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 540
 541         /* Initial status is no changes */
 542         retval = (ports + 8) / 8;
 543         memset(buf, 0, retval);
 544         status = 0;
 545
 546         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 547
 548         spin_lock_irqsave(&xhci->lock, flags);
 549         /* For each port, did anything change?  If so, set that bit in buf. */
 550         for (i = 0; i < ports; i++) {
 551                 addr = &xhci->op_regs->port_status_base +
 552                         NUM_PORT_REGS*i;
 553                 temp = xhci_readl(xhci, addr);
 554                 if ((temp & mask) != 0 ||
 555                         (xhci->port_c_suspend & 1 << i) ||
 556                         (xhci->resume_done[i] && time_after_eq(
 557                             jiffies, xhci->resume_done[i]))) {
 558                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 559                         status = 1;
 560                 }
 561         }
 562         spin_unlock_irqrestore(&xhci->lock, flags);
 563         return status ? retval : 0;
 564 }
 565
 566 #ifdef CONFIG_PM
 567
 568 int xhci_bus_suspend(struct usb_hcd *hcd)
 569 {
 570         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 571         int port;
 572         unsigned long flags;
 573
 574         xhci_dbg(xhci, "suspend root hub\n");
 575
 576         spin_lock_irqsave(&xhci->lock, flags);
 577
 578         if (hcd->self.root_hub->do_remote_wakeup) {
 579                 port = HCS_MAX_PORTS(xhci->hcs_params1);
 580                 while (port--) {
 581                         if (xhci->resume_done[port] != 0) {
 582                                 spin_unlock_irqrestore(&xhci->lock, flags);
 583                                 xhci_dbg(xhci, "suspend failed because "
 584                                                 "port %d is resuming\n",
 585                                                 port + 1);
 586                                 return -EBUSY;
 587                         }
 588                 }
 589         }
 590
 591         port = HCS_MAX_PORTS(xhci->hcs_params1);
 592         xhci->bus_suspended = 0;
 593         while (port--) {
 594                 /* suspend the port if the port is not suspended */
 595                 u32 __iomem *addr;
 596                 u32 t1, t2;
 597                 int slot_id;
 598
 599                 addr = &xhci->op_regs->port_status_base +
 600                         NUM_PORT_REGS * (port & 0xff);
 601                 t1 = xhci_readl(xhci, addr);
 602                 t2 = xhci_port_state_to_neutral(t1);
 603
 604                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 605                         xhci_dbg(xhci, "port %d not suspended\n", port);
 606                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 607                         if (slot_id) {
 608                                 spin_unlock_irqrestore(&xhci->lock, flags);
 609                                 xhci_stop_device(xhci, slot_id, 1);
 610                                 spin_lock_irqsave(&xhci->lock, flags);
 611                         }
 612                         t2 &= ~PORT_PLS_MASK;
 613                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 614                         set_bit(port, &xhci->bus_suspended);
 615                 }
 616                 if (hcd->self.root_hub->do_remote_wakeup) {
 617                         if (t1 & PORT_CONNECT) {
 618                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 619                                 t2 &= ~PORT_WKCONN_E;
 620                         } else {
 621                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 622                                 t2 &= ~PORT_WKDISC_E;
 623                         }
 624                 } else
 625                         t2 &= ~PORT_WAKE_BITS;
 626
 627                 t1 = xhci_port_state_to_neutral(t1);
 628                 if (t1 != t2)
 629                         xhci_writel(xhci, t2, addr);
 630
 631                 if (DEV_HIGHSPEED(t1)) {
 632                         /* enable remote wake up for USB 2.0 */
 633                         u32 __iomem *addr;
 634                         u32 tmp;
 635
 636                         addr = &xhci->op_regs->port_power_base +
 637                                 NUM_PORT_REGS * (port & 0xff);
 638                         tmp = xhci_readl(xhci, addr);
 639                         tmp |= PORT_RWE;
 640                         xhci_writel(xhci, tmp, addr);
 641                 }
 642         }
 643         hcd->state = HC_STATE_SUSPENDED;
 644         xhci->next_statechange = jiffies + msecs_to_jiffies(10);
 645         spin_unlock_irqrestore(&xhci->lock, flags);
 646         return 0;
 647 }
 648
 649 int xhci_bus_resume(struct usb_hcd *hcd)
 650 {
 651         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 652         int port;
 653         u32 temp;
 654         unsigned long flags;
 655
 656         xhci_dbg(xhci, "resume root hub\n");
 657
 658         if (time_before(jiffies, xhci->next_statechange))
 659                 msleep(5);
 660
 661         spin_lock_irqsave(&xhci->lock, flags);
 662         if (!HCD_HW_ACCESSIBLE(hcd)) {
 663                 spin_unlock_irqrestore(&xhci->lock, flags);
 664                 return -ESHUTDOWN;
 665         }
 666
 667         /* delay the irqs */
 668         temp = xhci_readl(xhci, &xhci->op_regs->command);
 669         temp &= ~CMD_EIE;
 670         xhci_writel(xhci, temp, &xhci->op_regs->command);
 671
 672         port = HCS_MAX_PORTS(xhci->hcs_params1);
 673         while (port--) {
 674                 /* Check whether need resume ports. If needed
 675                    resume port and disable remote wakeup */
 676                 u32 __iomem *addr;
 677                 u32 temp;
 678                 int slot_id;
 679
 680                 addr = &xhci->op_regs->port_status_base +
 681                         NUM_PORT_REGS * (port & 0xff);
 682                 temp = xhci_readl(xhci, addr);
 683                 if (DEV_SUPERSPEED(temp))
 684                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 685                 else
 686                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 687                 if (test_bit(port, &xhci->bus_suspended) &&
 688                     (temp & PORT_PLS_MASK)) {
 689                         if (DEV_SUPERSPEED(temp)) {
 690                                 temp = xhci_port_state_to_neutral(temp);
 691                                 temp &= ~PORT_PLS_MASK;
 692                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 693                                 xhci_writel(xhci, temp, addr);
 694                         } else {
 695                                 temp = xhci_port_state_to_neutral(temp);
 696                                 temp &= ~PORT_PLS_MASK;
 697                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 698                                 xhci_writel(xhci, temp, addr);
 699
 700                                 spin_unlock_irqrestore(&xhci->lock, flags);
 701                                 msleep(20);
 702                                 spin_lock_irqsave(&xhci->lock, flags);
 703
 704                                 temp = xhci_readl(xhci, addr);
 705                                 temp = xhci_port_state_to_neutral(temp);
 706                                 temp &= ~PORT_PLS_MASK;
 707                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 708                                 xhci_writel(xhci, temp, addr);
 709                         }
 710                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 711                         if (slot_id)
 712                                 xhci_ring_device(xhci, slot_id);
 713                 } else
 714                         xhci_writel(xhci, temp, addr);
 715
 716                 if (DEV_HIGHSPEED(temp)) {
 717                         /* disable remote wake up for USB 2.0 */
 718                         u32 __iomem *addr;
 719                         u32 tmp;
 720
 721                         addr = &xhci->op_regs->port_power_base +
 722                                 NUM_PORT_REGS * (port & 0xff);
 723                         tmp = xhci_readl(xhci, addr);
 724                         tmp &= ~PORT_RWE;
 725                         xhci_writel(xhci, tmp, addr);
 726                 }
 727         }
 728
 729         (void) xhci_readl(xhci, &xhci->op_regs->command);
 730
 731         xhci->next_statechange = jiffies + msecs_to_jiffies(5);
 732         hcd->state = HC_STATE_RUNNING;
 733         /* re-enable irqs */
 734         temp = xhci_readl(xhci, &xhci->op_regs->command);
 735         temp |= CMD_EIE;
 736         xhci_writel(xhci, temp, &xhci->op_regs->command);
 737         temp = xhci_readl(xhci, &xhci->op_regs->command);
 738
 739         spin_unlock_irqrestore(&xhci->lock, flags);
 740         return 0;
 741 }
 742
 743 #endif  /* CONFIG_PM */