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         /* Write 1 to disable the port */
 233         xhci_writel(xhci, port_status | PORT_PE, addr);
 234         port_status = xhci_readl(xhci, addr);
 235         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 236                         wIndex, port_status);
 237 }
 238
 239 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 240                 u16 wIndex, u32 __iomem *addr, u32 port_status)
 241 {
 242         char *port_change_bit;
 243         u32 status;
 244
 245         switch (wValue) {
 246         case USB_PORT_FEAT_C_RESET:
 247                 status = PORT_RC;
 248                 port_change_bit = "reset";
 249                 break;
 250         case USB_PORT_FEAT_C_CONNECTION:
 251                 status = PORT_CSC;
 252                 port_change_bit = "connect";
 253                 break;
 254         case USB_PORT_FEAT_C_OVER_CURRENT:
 255                 status = PORT_OCC;
 256                 port_change_bit = "over-current";
 257                 break;
 258         case USB_PORT_FEAT_C_ENABLE:
 259                 status = PORT_PEC;
 260                 port_change_bit = "enable/disable";
 261                 break;
 262         case USB_PORT_FEAT_C_SUSPEND:
 263                 status = PORT_PLC;
 264                 port_change_bit = "suspend/resume";
 265                 break;
 266         default:
 267                 /* Should never happen */
 268                 return;
 269         }
 270         /* Change bits are all write 1 to clear */
 271         xhci_writel(xhci, port_status | status, addr);
 272         port_status = xhci_readl(xhci, addr);
 273         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 274                         port_change_bit, wIndex, port_status);
 275 }
 276
 277 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 278                 u16 wIndex, char *buf, u16 wLength)
 279 {
 280         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 281         int ports;
 282         unsigned long flags;
 283         u32 temp, temp1, status;
 284         int retval = 0;
 285         u32 __iomem *addr;
 286         int slot_id;
 287
 288         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 289
 290         spin_lock_irqsave(&xhci->lock, flags);
 291         switch (typeReq) {
 292         case GetHubStatus:
 293                 /* No power source, over-current reported per port */
 294                 memset(buf, 0, 4);
 295                 break;
 296         case GetHubDescriptor:
 297                 xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
 298                 break;
 299         case GetPortStatus:
 300                 if (!wIndex || wIndex > ports)
 301                         goto error;
 302                 wIndex--;
 303                 status = 0;
 304                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 305                 temp = xhci_readl(xhci, addr);
 306                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 307
 308                 /* wPortChange bits */
 309                 if (temp & PORT_CSC)
 310                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 311                 if (temp & PORT_PEC)
 312                         status |= USB_PORT_STAT_C_ENABLE << 16;
 313                 if ((temp & PORT_OCC))
 314                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 315                 /*
 316                  * FIXME ignoring reset and USB 2.1/3.0 specific
 317                  * changes
 318                  */
 319                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 320                         && (temp & PORT_POWER))
 321                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 322                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 323                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 324                                 goto error;
 325                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 326                                                 xhci->resume_done[wIndex])) {
 327                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 328                                         wIndex + 1);
 329                                 xhci->resume_done[wIndex] = 0;
 330                                 temp1 = xhci_port_state_to_neutral(temp);
 331                                 temp1 &= ~PORT_PLS_MASK;
 332                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 333                                 xhci_writel(xhci, temp1, addr);
 334
 335                                 xhci_dbg(xhci, "set port %d resume\n",
 336                                         wIndex + 1);
 337                                 slot_id = xhci_find_slot_id_by_port(xhci,
 338                                                                  wIndex + 1);
 339                                 if (!slot_id) {
 340                                         xhci_dbg(xhci, "slot_id is zero\n");
 341                                         goto error;
 342                                 }
 343                                 xhci_ring_device(xhci, slot_id);
 344                                 xhci->port_c_suspend[wIndex >> 5] |=
 345                                                 1 << (wIndex & 31);
 346                                 xhci->suspended_ports[wIndex >> 5] &=
 347                                                 ~(1 << (wIndex & 31));
 348                         }
 349                 }
 350                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 351                         && (temp & PORT_POWER)
 352                         && (xhci->suspended_ports[wIndex >> 5] &
 353                             (1 << (wIndex & 31)))) {
 354                         xhci->suspended_ports[wIndex >> 5] &=
 355                                         ~(1 << (wIndex & 31));
 356                         xhci->port_c_suspend[wIndex >> 5] |=
 357                                         1 << (wIndex & 31);
 358                 }
 359                 if (temp & PORT_CONNECT) {
 360                         status |= USB_PORT_STAT_CONNECTION;
 361                         status |= xhci_port_speed(temp);
 362                 }
 363                 if (temp & PORT_PE)
 364                         status |= USB_PORT_STAT_ENABLE;
 365                 if (temp & PORT_OC)
 366                         status |= USB_PORT_STAT_OVERCURRENT;
 367                 if (temp & PORT_RESET)
 368                         status |= USB_PORT_STAT_RESET;
 369                 if (temp & PORT_POWER)
 370                         status |= USB_PORT_STAT_POWER;
 371                 if (xhci->port_c_suspend[wIndex >> 5] & (1 << (wIndex & 31)))
 372                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 373                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 374                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 375                 break;
 376         case SetPortFeature:
 377                 wIndex &= 0xff;
 378                 if (!wIndex || wIndex > ports)
 379                         goto error;
 380                 wIndex--;
 381                 addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
 382                 temp = xhci_readl(xhci, addr);
 383                 temp = xhci_port_state_to_neutral(temp);
 384                 switch (wValue) {
 385                 case USB_PORT_FEAT_SUSPEND:
 386                         temp = xhci_readl(xhci, addr);
 387                         /* In spec software should not attempt to suspend
 388                          * a port unless the port reports that it is in the
 389                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 390                          */
 391                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 392                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 393                                 xhci_warn(xhci, "USB core suspending device "
 394                                           "not in U0/U1/U2.\n");
 395                                 goto error;
 396                         }
 397
 398                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 399                         if (!slot_id) {
 400                                 xhci_warn(xhci, "slot_id is zero\n");
 401                                 goto error;
 402                         }
 403                         /* unlock to execute stop endpoint commands */
 404                         spin_unlock_irqrestore(&xhci->lock, flags);
 405                         xhci_stop_device(xhci, slot_id, 1);
 406                         spin_lock_irqsave(&xhci->lock, flags);
 407
 408                         temp = xhci_port_state_to_neutral(temp);
 409                         temp &= ~PORT_PLS_MASK;
 410                         temp |= PORT_LINK_STROBE | XDEV_U3;
 411                         xhci_writel(xhci, temp, addr);
 412
 413                         spin_unlock_irqrestore(&xhci->lock, flags);
 414                         msleep(10); /* wait device to enter */
 415                         spin_lock_irqsave(&xhci->lock, flags);
 416
 417                         temp = xhci_readl(xhci, addr);
 418                         xhci->suspended_ports[wIndex >> 5] |=
 419                                         1 << (wIndex & (31));
 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[wIndex >> 5] |=
 487                                                 1 << (wIndex & 31);
 488                         }
 489
 490                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
 491                         if (!slot_id) {
 492                                 xhci_dbg(xhci, "slot_id is zero\n");
 493                                 goto error;
 494                         }
 495                         xhci_ring_device(xhci, slot_id);
 496                         break;
 497                 case USB_PORT_FEAT_C_SUSPEND:
 498                         xhci->port_c_suspend[wIndex >> 5] &=
 499                                         ~(1 << (wIndex & 31));
 500                 case USB_PORT_FEAT_C_RESET:
 501                 case USB_PORT_FEAT_C_CONNECTION:
 502                 case USB_PORT_FEAT_C_OVER_CURRENT:
 503                 case USB_PORT_FEAT_C_ENABLE:
 504                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 505                                         addr, temp);
 506                         break;
 507                 case USB_PORT_FEAT_ENABLE:
 508                         xhci_disable_port(xhci, wIndex, addr, temp);
 509                         break;
 510                 default:
 511                         goto error;
 512                 }
 513                 break;
 514         default:
 515 error:
 516                 /* "stall" on error */
 517                 retval = -EPIPE;
 518         }
 519         spin_unlock_irqrestore(&xhci->lock, flags);
 520         return retval;
 521 }
 522
 523 /*
 524  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 525  * Ports are 0-indexed from the HCD point of view,
 526  * and 1-indexed from the USB core pointer of view.
 527  *
 528  * Note that the status change bits will be cleared as soon as a port status
 529  * change event is generated, so we use the saved status from that event.
 530  */
 531 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 532 {
 533         unsigned long flags;
 534         u32 temp, status;
 535         u32 mask;
 536         int i, retval;
 537         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 538         int ports;
 539         u32 __iomem *addr;
 540
 541         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 542
 543         /* Initial status is no changes */
 544         retval = (ports + 8) / 8;
 545         memset(buf, 0, retval);
 546         status = 0;
 547
 548         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 549
 550         spin_lock_irqsave(&xhci->lock, flags);
 551         /* For each port, did anything change?  If so, set that bit in buf. */
 552         for (i = 0; i < ports; i++) {
 553                 addr = &xhci->op_regs->port_status_base +
 554                         NUM_PORT_REGS*i;
 555                 temp = xhci_readl(xhci, addr);
 556                 if ((temp & mask) != 0 ||
 557                         (xhci->port_c_suspend[i >> 5] & 1 << (i & 31)) ||
 558                         (xhci->resume_done[i] && time_after_eq(
 559                             jiffies, xhci->resume_done[i]))) {
 560                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 561                         status = 1;
 562                 }
 563         }
 564         spin_unlock_irqrestore(&xhci->lock, flags);
 565         return status ? retval : 0;
 566 }
 567
 568 #ifdef CONFIG_PM
 569
 570 int xhci_bus_suspend(struct usb_hcd *hcd)
 571 {
 572         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 573         int port;
 574         unsigned long flags;
 575
 576         xhci_dbg(xhci, "suspend root hub\n");
 577
 578         spin_lock_irqsave(&xhci->lock, flags);
 579
 580         if (hcd->self.root_hub->do_remote_wakeup) {
 581                 port = HCS_MAX_PORTS(xhci->hcs_params1);
 582                 while (port--) {
 583                         if (xhci->resume_done[port] != 0) {
 584                                 spin_unlock_irqrestore(&xhci->lock, flags);
 585                                 xhci_dbg(xhci, "suspend failed because "
 586                                                 "port %d is resuming\n",
 587                                                 port + 1);
 588                                 return -EBUSY;
 589                         }
 590                 }
 591         }
 592
 593         port = HCS_MAX_PORTS(xhci->hcs_params1);
 594         xhci->bus_suspended = 0;
 595         while (port--) {
 596                 /* suspend the port if the port is not suspended */
 597                 u32 __iomem *addr;
 598                 u32 t1, t2;
 599                 int slot_id;
 600
 601                 addr = &xhci->op_regs->port_status_base +
 602                         NUM_PORT_REGS * (port & 0xff);
 603                 t1 = xhci_readl(xhci, addr);
 604                 t2 = xhci_port_state_to_neutral(t1);
 605
 606                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 607                         xhci_dbg(xhci, "port %d not suspended\n", port);
 608                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 609                         if (slot_id) {
 610                                 spin_unlock_irqrestore(&xhci->lock, flags);
 611                                 xhci_stop_device(xhci, slot_id, 1);
 612                                 spin_lock_irqsave(&xhci->lock, flags);
 613                         }
 614                         t2 &= ~PORT_PLS_MASK;
 615                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 616                         set_bit(port, &xhci->bus_suspended);
 617                 }
 618                 if (hcd->self.root_hub->do_remote_wakeup) {
 619                         if (t1 & PORT_CONNECT) {
 620                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 621                                 t2 &= ~PORT_WKCONN_E;
 622                         } else {
 623                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 624                                 t2 &= ~PORT_WKDISC_E;
 625                         }
 626                 } else
 627                         t2 &= ~PORT_WAKE_BITS;
 628
 629                 t1 = xhci_port_state_to_neutral(t1);
 630                 if (t1 != t2)
 631                         xhci_writel(xhci, t2, addr);
 632
 633                 if (DEV_HIGHSPEED(t1)) {
 634                         /* enable remote wake up for USB 2.0 */
 635                         u32 __iomem *addr;
 636                         u32 tmp;
 637
 638                         addr = &xhci->op_regs->port_power_base +
 639                                 NUM_PORT_REGS * (port & 0xff);
 640                         tmp = xhci_readl(xhci, addr);
 641                         tmp |= PORT_RWE;
 642                         xhci_writel(xhci, tmp, addr);
 643                 }
 644         }
 645         hcd->state = HC_STATE_SUSPENDED;
 646         xhci->next_statechange = jiffies + msecs_to_jiffies(10);
 647         spin_unlock_irqrestore(&xhci->lock, flags);
 648         return 0;
 649 }
 650
 651 int xhci_bus_resume(struct usb_hcd *hcd)
 652 {
 653         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 654         int port;
 655         u32 temp;
 656         unsigned long flags;
 657
 658         xhci_dbg(xhci, "resume root hub\n");
 659
 660         if (time_before(jiffies, xhci->next_statechange))
 661                 msleep(5);
 662
 663         spin_lock_irqsave(&xhci->lock, flags);
 664         if (!HCD_HW_ACCESSIBLE(hcd)) {
 665                 spin_unlock_irqrestore(&xhci->lock, flags);
 666                 return -ESHUTDOWN;
 667         }
 668
 669         /* delay the irqs */
 670         temp = xhci_readl(xhci, &xhci->op_regs->command);
 671         temp &= ~CMD_EIE;
 672         xhci_writel(xhci, temp, &xhci->op_regs->command);
 673
 674         port = HCS_MAX_PORTS(xhci->hcs_params1);
 675         while (port--) {
 676                 /* Check whether need resume ports. If needed
 677                    resume port and disable remote wakeup */
 678                 u32 __iomem *addr;
 679                 u32 temp;
 680                 int slot_id;
 681
 682                 addr = &xhci->op_regs->port_status_base +
 683                         NUM_PORT_REGS * (port & 0xff);
 684                 temp = xhci_readl(xhci, addr);
 685                 if (DEV_SUPERSPEED(temp))
 686                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 687                 else
 688                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 689                 if (test_bit(port, &xhci->bus_suspended) &&
 690                     (temp & PORT_PLS_MASK)) {
 691                         if (DEV_SUPERSPEED(temp)) {
 692                                 temp = xhci_port_state_to_neutral(temp);
 693                                 temp &= ~PORT_PLS_MASK;
 694                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 695                                 xhci_writel(xhci, temp, addr);
 696                         } else {
 697                                 temp = xhci_port_state_to_neutral(temp);
 698                                 temp &= ~PORT_PLS_MASK;
 699                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 700                                 xhci_writel(xhci, temp, addr);
 701
 702                                 spin_unlock_irqrestore(&xhci->lock, flags);
 703                                 msleep(20);
 704                                 spin_lock_irqsave(&xhci->lock, flags);
 705
 706                                 temp = xhci_readl(xhci, addr);
 707                                 temp = xhci_port_state_to_neutral(temp);
 708                                 temp &= ~PORT_PLS_MASK;
 709                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 710                                 xhci_writel(xhci, temp, addr);
 711                         }
 712                         slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
 713                         if (slot_id)
 714                                 xhci_ring_device(xhci, slot_id);
 715                 } else
 716                         xhci_writel(xhci, temp, addr);
 717
 718                 if (DEV_HIGHSPEED(temp)) {
 719                         /* disable remote wake up for USB 2.0 */
 720                         u32 __iomem *addr;
 721                         u32 tmp;
 722
 723                         addr = &xhci->op_regs->port_power_base +
 724                                 NUM_PORT_REGS * (port & 0xff);
 725                         tmp = xhci_readl(xhci, addr);
 726                         tmp &= ~PORT_RWE;
 727                         xhci_writel(xhci, tmp, addr);
 728                 }
 729         }
 730
 731         (void) xhci_readl(xhci, &xhci->op_regs->command);
 732
 733         xhci->next_statechange = jiffies + msecs_to_jiffies(5);
 734         hcd->state = HC_STATE_RUNNING;
 735         /* re-enable irqs */
 736         temp = xhci_readl(xhci, &xhci->op_regs->command);
 737         temp |= CMD_EIE;
 738         xhci_writel(xhci, temp, &xhci->op_regs->command);
 739         temp = xhci_readl(xhci, &xhci->op_regs->command);
 740
 741         spin_unlock_irqrestore(&xhci->lock, flags);
 742         return 0;
 743 }
 744
 745 #else
 746
 747 #define xhci_bus_suspend        NULL
 748 #define xhci_bus_resume         NULL
 749
 750 #endif