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         /* Why does core/hcd.h define bitmap?  It's just confusing. */
  49         memset(&desc->DeviceRemovable[0], 0, temp);
  50         memset(&desc->DeviceRemovable[temp], 0xff, temp);
  51
  52         /* Ugh, these should be #defines, FIXME */
  53         /* Using table 11-13 in USB 2.0 spec. */
  54         temp = 0;
  55         /* Bits 1:0 - support port power switching, or power always on */
  56         if (HCC_PPC(xhci->hcc_params))
  57                 temp |= 0x0001;
  58         else
  59                 temp |= 0x0002;
  60         /* Bit  2 - root hubs are not part of a compound device */
  61         /* Bits 4:3 - individual port over current protection */
  62         temp |= 0x0008;
  63         /* Bits 6:5 - no TTs in root ports */
  64         /* Bit  7 - no port indicators */
  65         desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
  66 }
  67
  68 static unsigned int xhci_port_speed(unsigned int port_status)
  69 {
  70         if (DEV_LOWSPEED(port_status))
  71                 return USB_PORT_STAT_LOW_SPEED;
  72         if (DEV_HIGHSPEED(port_status))
  73                 return USB_PORT_STAT_HIGH_SPEED;
  74         if (DEV_SUPERSPEED(port_status))
  75                 return USB_PORT_STAT_SUPER_SPEED;
  76         /*
  77          * FIXME: Yes, we should check for full speed, but the core uses that as
  78          * a default in portspeed() in usb/core/hub.c (which is the only place
  79          * USB_PORT_STAT_*_SPEED is used).
  80          */
  81         return 0;
  82 }
  83
  84 /*
  85  * These bits are Read Only (RO) and should be saved and written to the
  86  * registers: 0, 3, 10:13, 30
  87  * connect status, over-current status, port speed, and device removable.
  88  * connect status and port speed are also sticky - meaning they're in
  89  * the AUX well and they aren't changed by a hot, warm, or cold reset.
  90  */
  91 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
  92 /*
  93  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
  94  * bits 5:8, 9, 14:15, 25:27
  95  * link state, port power, port indicator state, "wake on" enable state
  96  */
  97 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
  98 /*
  99  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 100  * bit 4 (port reset)
 101  */
 102 #define XHCI_PORT_RW1S  ((1<<4))
 103 /*
 104  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 105  * bits 1, 17, 18, 19, 20, 21, 22, 23
 106  * port enable/disable, and
 107  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 108  * over-current, reset, link state, and L1 change
 109  */
 110 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 111 /*
 112  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 113  * latched in
 114  */
 115 #define XHCI_PORT_RW    ((1<<16))
 116 /*
 117  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 118  * bits 2, 24, 28:31
 119  */
 120 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 121
 122 /*
 123  * Given a port state, this function returns a value that would result in the
 124  * port being in the same state, if the value was written to the port status
 125  * control register.
 126  * Save Read Only (RO) bits and save read/write bits where
 127  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 128  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 129  */
 130 u32 xhci_port_state_to_neutral(u32 state)
 131 {
 132         /* Save read-only status and port state */
 133         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 134 }
 135
 136 /*
 137  * find slot id based on port number.
 138  */
 139 int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
 140 {
 141         int slot_id;
 142         int i;
 143
 144         slot_id = 0;
 145         for (i = 0; i < MAX_HC_SLOTS; i++) {
 146                 if (!xhci->devs[i])
 147                         continue;
 148                 if (xhci->devs[i]->port == port) {
 149                         slot_id = i;
 150                         break;
 151                 }
 152         }
 153
 154         return slot_id;
 155 }
 156
 157 /*
 158  * Stop device
 159  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 160  * to complete.
 161  * suspend will set to 1, if suspend bit need to set in command.
 162  */
 163 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 164 {
 165         struct xhci_virt_device *virt_dev;
 166         struct xhci_command *cmd;
 167         unsigned long flags;
 168         int timeleft;
 169         int ret;
 170         int i;
 171
 172         ret = 0;
 173         virt_dev = xhci->devs[slot_id];
 174         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
 175         if (!cmd) {
 176                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
 177                 return -ENOMEM;
 178         }
 179
 180         spin_lock_irqsave(&xhci->lock, flags);
 181         for (i = LAST_EP_INDEX; i > 0; i--) {
 182                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
 183                         xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
 184         }
 185         cmd->command_trb = xhci->cmd_ring->enqueue;
 186         list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
 187         xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
 188         xhci_ring_cmd_db(xhci);
 189         spin_unlock_irqrestore(&xhci->lock, flags);
 190
 191         /* Wait for last stop endpoint command to finish */
 192         timeleft = wait_for_completion_interruptible_timeout(
 193                         cmd->completion,
 194                         USB_CTRL_SET_TIMEOUT);
 195         if (timeleft <= 0) {
 196                 xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
 197                                 timeleft == 0 ? "Timeout" : "Signal");
 198                 spin_lock_irqsave(&xhci->lock, flags);
 199                 /* The timeout might have raced with the event ring handler, so
 200                  * only delete from the list if the item isn't poisoned.
 201                  */
 202                 if (cmd->cmd_list.next != LIST_POISON1)
 203                         list_del(&cmd->cmd_list);
 204                 spin_unlock_irqrestore(&xhci->lock, flags);
 205                 ret = -ETIME;
 206                 goto command_cleanup;
 207         }
 208
 209 command_cleanup:
 210         xhci_free_command(xhci, cmd);
 211         return ret;
 212 }
 213
 214 /*
 215  * Ring device, it rings the all doorbells unconditionally.
 216  */
 217 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 218 {
 219         int i;
 220
 221         for (i = 0; i < LAST_EP_INDEX + 1; i++)
 222                 if (xhci->devs[slot_id]->eps[i].ring &&
 223                     xhci->devs[slot_id]->eps[i].ring->dequeue)
 224                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 225
 226         return;
 227 }
 228
 229 static void xhci_disable_port(struct xhci_hcd *xhci, u16 wIndex,
 230                 u32 __iomem *addr, u32 port_status)
 231 {
 232         /* Don't allow the USB core to disable SuperSpeed ports. */
 233         if (xhci->port_array[wIndex] == 0x03) {
 234                 xhci_dbg(xhci, "Ignoring request to disable "
 235                                 "SuperSpeed port.\n");
 236                 return;
 237         }
 238
 239         /* Write 1 to disable the port */
 240         xhci_writel(xhci, port_status | PORT_PE, addr);
 241         port_status = xhci_readl(xhci, addr);
 242         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 243                         wIndex, port_status);
 244 }
 245
 246 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 247                 u16 wIndex, u32 __iomem *addr, u32 port_status)
 248 {
 249         char *port_change_bit;
 250         u32 status;
 251
 252         switch (wValue) {
 253         case USB_PORT_FEAT_C_RESET:
 254                 status = PORT_RC;
 255                 port_change_bit = "reset";
 256                 break;
 257         case USB_PORT_FEAT_C_CONNECTION:
 258                 status = PORT_CSC;
 259                 port_change_bit = "connect";
 260                 break;
 261         case USB_PORT_FEAT_C_OVER_CURRENT:
 262                 status = PORT_OCC;
 263                 port_change_bit = "over-current";
 264                 break;
 265         case USB_PORT_FEAT_C_ENABLE:
 266                 status = PORT_PEC;
 267                 port_change_bit = "enable/disable";
 268                 break;
 269         case USB_PORT_FEAT_C_SUSPEND:
 270                 status = PORT_PLC;
 271                 port_change_bit = "suspend/resume";
 272                 break;
 273         default:
 274                 /* Should never happen */
 275                 return;
 276         }
 277         /* Change bits are all write 1 to clear */
 278         xhci_writel(xhci, port_status | status, addr);
 279         port_status = xhci_readl(xhci, addr);
 280         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 281                         port_change_bit, wIndex, port_status);
 282 }
 283
 284 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 285                 u16 wIndex, char *buf, u16 wLength)
 286 {
 287         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 288         int ports;
 289         unsigned long flags;
 290         u32 temp, temp1, status;
 291         int retval = 0;
 292         u32 __iomem *addr;
 293         int slot_id;
 294
 295         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 296
 297         spin_lock_irqsave(&xhci->lock, flags);
 298         switch (typeReq) {
 299         case GetHubStatus:
 300                 /* No power source, over-current reported per port */
 301                 memset(buf, 0, 4);
 302                 break;
 303         case GetHubDescriptor:
 304                 xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
 305                 break;
 306         case GetPortStatus:
 307                 if (!wIndex || wIndex > ports)
 308                         goto error;
 309                 wIndex--;
 310                 status = 0;
 311                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 312                 temp = xhci_readl(xhci, addr);
 313                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 314
 315                 /* wPortChange bits */
 316                 if (temp & PORT_CSC)
 317                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 318                 if (temp & PORT_PEC)
 319                         status |= USB_PORT_STAT_C_ENABLE << 16;
 320                 if ((temp & PORT_OCC))
 321                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 322                 /*
 323                  * FIXME ignoring reset and USB 2.1/3.0 specific
 324                  * changes
 325                  */
 326                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 327                         && (temp & PORT_POWER))
 328                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 329                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 330                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 331                                 goto error;
 332                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 333                                                 xhci->resume_done[wIndex])) {
 334                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 335                                         wIndex + 1);
 336                                 xhci->resume_done[wIndex] = 0;
 337                                 temp1 = xhci_port_state_to_neutral(temp);
 338                                 temp1 &= ~PORT_PLS_MASK;
 339                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 340                                 xhci_writel(xhci, temp1, addr);
 341
 342                                 xhci_dbg(xhci, "set port %d resume\n",
 343                                         wIndex + 1);
 344                                 slot_id = xhci_find_slot_id_by_port(xhci,
 345                                                                  wIndex + 1);
 346                                 if (!slot_id) {
 347                                         xhci_dbg(xhci, "slot_id is zero\n");
 348                                         goto error;
 349                                 }
 350                                 xhci_ring_device(xhci, slot_id);
 351                                 xhci->port_c_suspend[wIndex >> 5] |=
 352                                                 1 << (wIndex & 31);
 353                                 xhci->suspended_ports[wIndex >> 5] &=
 354                                                 ~(1 << (wIndex & 31));
 355                         }
 356                 }
 357                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 358                         && (temp & PORT_POWER)
 359                         && (xhci->suspended_ports[wIndex >> 5] &
 360                             (1 << (wIndex & 31)))) {
 361                         xhci->suspended_ports[wIndex >> 5] &=
 362                                         ~(1 << (wIndex & 31));
 363                         xhci->port_c_suspend[wIndex >> 5] |=
 364                                         1 << (wIndex & 31);
 365                 }
 366                 if (temp & PORT_CONNECT) {
 367                         status |= USB_PORT_STAT_CONNECTION;
 368                         status |= xhci_port_speed(temp);
 369                 }
 370                 if (temp & PORT_PE)
 371                         status |= USB_PORT_STAT_ENABLE;
 372                 if (temp & PORT_OC)
 373                         status |= USB_PORT_STAT_OVERCURRENT;
 374                 if (temp & PORT_RESET)
 375                         status |= USB_PORT_STAT_RESET;
 376                 if (temp & PORT_POWER)
 377                         status |= USB_PORT_STAT_POWER;
 378                 if (xhci->port_c_suspend[wIndex >> 5] & (1 << (wIndex & 31)))
 379                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 380                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 381                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 382                 break;
 383         case SetPortFeature:
 384                 wIndex &= 0xff;
 385                 if (!wIndex || wIndex > ports)
 386                         goto error;
 387                 wIndex--;
 388                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 389                 temp = xhci_readl(xhci, addr);
 390                 temp = xhci_port_state_to_neutral(temp);
 391                 switch (wValue) {
 392                 case USB_PORT_FEAT_SUSPEND:
 393                         temp = xhci_readl(xhci, addr);
 394                         /* In spec software should not attempt to suspend
 395                          * a port unless the port reports that it is in the
 396                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 397                          */
 398                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 399                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 400                                 xhci_warn(xhci, "USB core suspending device "
 401                                           "not in U0/U1/U2.\n");
 402                                 goto error;
 403                         }
 404
 405                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 406                         if (!slot_id) {
 407                                 xhci_warn(xhci, "slot_id is zero\n");
 408                                 goto error;
 409                         }
 410                         /* unlock to execute stop endpoint commands */
 411                         spin_unlock_irqrestore(&xhci->lock, flags);
 412                         xhci_stop_device(xhci, slot_id, 1);
 413                         spin_lock_irqsave(&xhci->lock, flags);
 414
 415                         temp = xhci_port_state_to_neutral(temp);
 416                         temp &= ~PORT_PLS_MASK;
 417                         temp |= PORT_LINK_STROBE | XDEV_U3;
 418                         xhci_writel(xhci, temp, addr);
 419
 420                         spin_unlock_irqrestore(&xhci->lock, flags);
 421                         msleep(10); /* wait device to enter */
 422                         spin_lock_irqsave(&xhci->lock, flags);
 423
 424                         temp = xhci_readl(xhci, addr);
 425                         xhci->suspended_ports[wIndex >> 5] |=
 426                                         1 << (wIndex & (31));
 427                         break;
 428                 case USB_PORT_FEAT_POWER:
 429                         /*
 430                          * Turn on ports, even if there isn't per-port switching.
 431                          * HC will report connect events even before this is set.
 432                          * However, khubd will ignore the roothub events until
 433                          * the roothub is registered.
 434                          */
 435                         xhci_writel(xhci, temp | PORT_POWER, addr);
 436
 437                         temp = xhci_readl(xhci, addr);
 438                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 439                         break;
 440                 case USB_PORT_FEAT_RESET:
 441                         temp = (temp | PORT_RESET);
 442                         xhci_writel(xhci, temp, addr);
 443
 444                         temp = xhci_readl(xhci, addr);
 445                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 446                         break;
 447                 default:
 448                         goto error;
 449                 }
 450                 temp = xhci_readl(xhci, addr); /* unblock any posted writes */
 451                 break;
 452         case ClearPortFeature:
 453                 if (!wIndex || wIndex > ports)
 454                         goto error;
 455                 wIndex--;
 456                 addr = &xhci->op_regs->port_status_base +
 457                         NUM_PORT_REGS*(wIndex & 0xff);
 458                 temp = xhci_readl(xhci, addr);
 459                 temp = xhci_port_state_to_neutral(temp);
 460                 switch (wValue) {
 461                 case USB_PORT_FEAT_SUSPEND:
 462                         temp = xhci_readl(xhci, addr);
 463                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 464                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 465                         if (temp & PORT_RESET)
 466                                 goto error;
 467                         if (temp & XDEV_U3) {
 468                                 if ((temp & PORT_PE) == 0)
 469                                         goto error;
 470                                 if (DEV_SUPERSPEED(temp)) {
 471                                         temp = xhci_port_state_to_neutral(temp);
 472                                         temp &= ~PORT_PLS_MASK;
 473                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 474                                         xhci_writel(xhci, temp, addr);
 475                                         xhci_readl(xhci, addr);
 476                                 } else {
 477                                         temp = xhci_port_state_to_neutral(temp);
 478                                         temp &= ~PORT_PLS_MASK;
 479                                         temp |= PORT_LINK_STROBE | XDEV_RESUME;
 480                                         xhci_writel(xhci, temp, addr);
 481
 482                                         spin_unlock_irqrestore(&xhci->lock,
 483                                                                flags);
 484                                         msleep(20);
 485                                         spin_lock_irqsave(&xhci->lock, flags);
 486
 487                                         temp = xhci_readl(xhci, addr);
 488                                         temp = xhci_port_state_to_neutral(temp);
 489                                         temp &= ~PORT_PLS_MASK;
 490                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 491                                         xhci_writel(xhci, temp, addr);
 492                                 }
 493                                 xhci->port_c_suspend[wIndex >> 5] |=
 494                                                 1 << (wIndex & 31);
 495                         }
 496
 497                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 498                         if (!slot_id) {
 499                                 xhci_dbg(xhci, "slot_id is zero\n");
 500                                 goto error;
 501                         }
 502                         xhci_ring_device(xhci, slot_id);
 503                         break;
 504                 case USB_PORT_FEAT_C_SUSPEND:
 505                         xhci->port_c_suspend[wIndex >> 5] &=
 506                                         ~(1 << (wIndex & 31));
 507                 case USB_PORT_FEAT_C_RESET:
 508                 case USB_PORT_FEAT_C_CONNECTION:
 509                 case USB_PORT_FEAT_C_OVER_CURRENT:
 510                 case USB_PORT_FEAT_C_ENABLE:
 511                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 512                                         addr, temp);
 513                         break;
 514                 case USB_PORT_FEAT_ENABLE:
 515                         xhci_disable_port(xhci, wIndex, addr, temp);
 516                         break;
 517                 default:
 518                         goto error;
 519                 }
 520                 break;
 521         default:
 522 error:
 523                 /* "stall" on error */
 524                 retval = -EPIPE;
 525         }
 526         spin_unlock_irqrestore(&xhci->lock, flags);
 527         return retval;
 528 }
 529
 530 /*
 531  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 532  * Ports are 0-indexed from the HCD point of view,
 533  * and 1-indexed from the USB core pointer of view.
 534  *
 535  * Note that the status change bits will be cleared as soon as a port status
 536  * change event is generated, so we use the saved status from that event.
 537  */
 538 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 539 {
 540         unsigned long flags;
 541         u32 temp, status;
 542         u32 mask;
 543         int i, retval;
 544         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 545         int ports;
 546         u32 __iomem *addr;
 547
 548         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 549
 550         /* Initial status is no changes */
 551         retval = (ports + 8) / 8;
 552         memset(buf, 0, retval);
 553         status = 0;
 554
 555         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 556
 557         spin_lock_irqsave(&xhci->lock, flags);
 558         /* For each port, did anything change?  If so, set that bit in buf. */
 559         for (i = 0; i < ports; i++) {
 560                 addr = &xhci->op_regs->port_status_base +
 561                         NUM_PORT_REGS*i;
 562                 temp = xhci_readl(xhci, addr);
 563                 if ((temp & mask) != 0 ||
 564                         (xhci->port_c_suspend[i >> 5] & 1 << (i & 31)) ||
 565                         (xhci->resume_done[i] && time_after_eq(
 566                             jiffies, xhci->resume_done[i]))) {
 567                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 568                         status = 1;
 569                 }
 570         }
 571         spin_unlock_irqrestore(&xhci->lock, flags);
 572         return status ? retval : 0;
 573 }
 574
 575 #ifdef CONFIG_PM
 576
 577 int xhci_bus_suspend(struct usb_hcd *hcd)
 578 {
 579         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 580         int port;
 581         unsigned long flags;
 582
 583         xhci_dbg(xhci, "suspend root hub\n");
 584
 585         spin_lock_irqsave(&xhci->lock, flags);
 586
 587         if (hcd->self.root_hub->do_remote_wakeup) {
 588                 port = HCS_MAX_PORTS(xhci->hcs_params1);
 589                 while (port--) {
 590                         if (xhci->resume_done[port] != 0) {
 591                                 spin_unlock_irqrestore(&xhci->lock, flags);
 592                                 xhci_dbg(xhci, "suspend failed because "
 593                                                 "port %d is resuming\n",
 594                                                 port + 1);
 595                                 return -EBUSY;
 596                         }
 597                 }
 598         }
 599
 600         port = HCS_MAX_PORTS(xhci->hcs_params1);
 601         xhci->bus_suspended = 0;
 602         while (port--) {
 603                 /* suspend the port if the port is not suspended */
 604                 u32 __iomem *addr;
 605                 u32 t1, t2;
 606                 int slot_id;
 607
 608                 addr = &xhci->op_regs->port_status_base +
 609                         NUM_PORT_REGS * (port & 0xff);
 610                 t1 = xhci_readl(xhci, addr);
 611                 t2 = xhci_port_state_to_neutral(t1);
 612
 613                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 614                         xhci_dbg(xhci, "port %d not suspended\n", port);
 615                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 616                         if (slot_id) {
 617                                 spin_unlock_irqrestore(&xhci->lock, flags);
 618                                 xhci_stop_device(xhci, slot_id, 1);
 619                                 spin_lock_irqsave(&xhci->lock, flags);
 620                         }
 621                         t2 &= ~PORT_PLS_MASK;
 622                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 623                         set_bit(port, &xhci->bus_suspended);
 624                 }
 625                 if (hcd->self.root_hub->do_remote_wakeup) {
 626                         if (t1 & PORT_CONNECT) {
 627                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 628                                 t2 &= ~PORT_WKCONN_E;
 629                         } else {
 630                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 631                                 t2 &= ~PORT_WKDISC_E;
 632                         }
 633                 } else
 634                         t2 &= ~PORT_WAKE_BITS;
 635
 636                 t1 = xhci_port_state_to_neutral(t1);
 637                 if (t1 != t2)
 638                         xhci_writel(xhci, t2, addr);
 639
 640                 if (DEV_HIGHSPEED(t1)) {
 641                         /* enable remote wake up for USB 2.0 */
 642                         u32 __iomem *addr;
 643                         u32 tmp;
 644
 645                         addr = &xhci->op_regs->port_power_base +
 646                                 NUM_PORT_REGS * (port & 0xff);
 647                         tmp = xhci_readl(xhci, addr);
 648                         tmp |= PORT_RWE;
 649                         xhci_writel(xhci, tmp, addr);
 650                 }
 651         }
 652         hcd->state = HC_STATE_SUSPENDED;
 653         xhci->next_statechange = jiffies + msecs_to_jiffies(10);
 654         spin_unlock_irqrestore(&xhci->lock, flags);
 655         return 0;
 656 }
 657
 658 int xhci_bus_resume(struct usb_hcd *hcd)
 659 {
 660         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 661         int port;
 662         u32 temp;
 663         unsigned long flags;
 664
 665         xhci_dbg(xhci, "resume root hub\n");
 666
 667         if (time_before(jiffies, xhci->next_statechange))
 668                 msleep(5);
 669
 670         spin_lock_irqsave(&xhci->lock, flags);
 671         if (!HCD_HW_ACCESSIBLE(hcd)) {
 672                 spin_unlock_irqrestore(&xhci->lock, flags);
 673                 return -ESHUTDOWN;
 674         }
 675
 676         /* delay the irqs */
 677         temp = xhci_readl(xhci, &xhci->op_regs->command);
 678         temp &= ~CMD_EIE;
 679         xhci_writel(xhci, temp, &xhci->op_regs->command);
 680
 681         port = HCS_MAX_PORTS(xhci->hcs_params1);
 682         while (port--) {
 683                 /* Check whether need resume ports. If needed
 684                    resume port and disable remote wakeup */
 685                 u32 __iomem *addr;
 686                 u32 temp;
 687                 int slot_id;
 688
 689                 addr = &xhci->op_regs->port_status_base +
 690                         NUM_PORT_REGS * (port & 0xff);
 691                 temp = xhci_readl(xhci, addr);
 692                 if (DEV_SUPERSPEED(temp))
 693                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 694                 else
 695                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 696                 if (test_bit(port, &xhci->bus_suspended) &&
 697                     (temp & PORT_PLS_MASK)) {
 698                         if (DEV_SUPERSPEED(temp)) {
 699                                 temp = xhci_port_state_to_neutral(temp);
 700                                 temp &= ~PORT_PLS_MASK;
 701                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 702                                 xhci_writel(xhci, temp, addr);
 703                         } else {
 704                                 temp = xhci_port_state_to_neutral(temp);
 705                                 temp &= ~PORT_PLS_MASK;
 706                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 707                                 xhci_writel(xhci, temp, addr);
 708
 709                                 spin_unlock_irqrestore(&xhci->lock, flags);
 710                                 msleep(20);
 711                                 spin_lock_irqsave(&xhci->lock, flags);
 712
 713                                 temp = xhci_readl(xhci, addr);
 714                                 temp = xhci_port_state_to_neutral(temp);
 715                                 temp &= ~PORT_PLS_MASK;
 716                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 717                                 xhci_writel(xhci, temp, addr);
 718                         }
 719                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 720                         if (slot_id)
 721                                 xhci_ring_device(xhci, slot_id);
 722                 } else
 723                         xhci_writel(xhci, temp, addr);
 724
 725                 if (DEV_HIGHSPEED(temp)) {
 726                         /* disable remote wake up for USB 2.0 */
 727                         u32 __iomem *addr;
 728                         u32 tmp;
 729
 730                         addr = &xhci->op_regs->port_power_base +
 731                                 NUM_PORT_REGS * (port & 0xff);
 732                         tmp = xhci_readl(xhci, addr);
 733                         tmp &= ~PORT_RWE;
 734                         xhci_writel(xhci, tmp, addr);
 735                 }
 736         }
 737
 738         (void) xhci_readl(xhci, &xhci->op_regs->command);
 739
 740         xhci->next_statechange = jiffies + msecs_to_jiffies(5);
 741         hcd->state = HC_STATE_RUNNING;
 742         /* re-enable irqs */
 743         temp = xhci_readl(xhci, &xhci->op_regs->command);
 744         temp |= CMD_EIE;
 745         xhci_writel(xhci, temp, &xhci->op_regs->command);
 746         temp = xhci_readl(xhci, &xhci->op_regs->command);
 747
 748         spin_unlock_irqrestore(&xhci->lock, flags);
 749         return 0;
 750 }
 751
 752 #endif  /* CONFIG_PM */