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->u.hs.DeviceRemovable[0], 0, temp);
  49         memset(&desc->u.hs.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 usb_hcd *hcd, struct xhci_hcd *xhci,
 139                 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 *port_array[15 + USB_MAXCHILDREN];
 293         int i;
 294         int slot_id;
 295         struct xhci_bus_state *bus_state;
 296
 297         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 298         for (i = 0; i < ports; i++) {
 299                 if (i < xhci->num_usb3_ports)
 300                         port_array[i] = xhci->usb3_ports[i];
 301                 else
 302                         port_array[i] =
 303                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
 304         }
 305         bus_state = &xhci->bus_state[hcd_index(hcd)];
 306
 307         spin_lock_irqsave(&xhci->lock, flags);
 308         switch (typeReq) {
 309         case GetHubStatus:
 310                 /* No power source, over-current reported per port */
 311                 memset(buf, 0, 4);
 312                 break;
 313         case GetHubDescriptor:
 314                 xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
 315                 break;
 316         case GetPortStatus:
 317                 if (!wIndex || wIndex > ports)
 318                         goto error;
 319                 wIndex--;
 320                 status = 0;
 321                 temp = xhci_readl(xhci, port_array[wIndex]);
 322                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 323
 324                 /* wPortChange bits */
 325                 if (temp & PORT_CSC)
 326                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 327                 if (temp & PORT_PEC)
 328                         status |= USB_PORT_STAT_C_ENABLE << 16;
 329                 if ((temp & PORT_OCC))
 330                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 331                 /*
 332                  * FIXME ignoring reset and USB 2.1/3.0 specific
 333                  * changes
 334                  */
 335                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 336                         && (temp & PORT_POWER))
 337                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 338                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 339                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 340                                 goto error;
 341                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 342                                                 bus_state->resume_done[wIndex])) {
 343                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 344                                         wIndex + 1);
 345                                 bus_state->resume_done[wIndex] = 0;
 346                                 temp1 = xhci_port_state_to_neutral(temp);
 347                                 temp1 &= ~PORT_PLS_MASK;
 348                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 349                                 xhci_writel(xhci, temp1, port_array[wIndex]);
 350
 351                                 xhci_dbg(xhci, "set port %d resume\n",
 352                                         wIndex + 1);
 353                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 354                                                                  wIndex + 1);
 355                                 if (!slot_id) {
 356                                         xhci_dbg(xhci, "slot_id is zero\n");
 357                                         goto error;
 358                                 }
 359                                 xhci_ring_device(xhci, slot_id);
 360                                 bus_state->port_c_suspend |= 1 << wIndex;
 361                                 bus_state->suspended_ports &= ~(1 << wIndex);
 362                         }
 363                 }
 364                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 365                         && (temp & PORT_POWER)
 366                         && (bus_state->suspended_ports & (1 << wIndex))) {
 367                         bus_state->suspended_ports &= ~(1 << wIndex);
 368                         bus_state->port_c_suspend |= 1 << wIndex;
 369                 }
 370                 if (temp & PORT_CONNECT) {
 371                         status |= USB_PORT_STAT_CONNECTION;
 372                         status |= xhci_port_speed(temp);
 373                 }
 374                 if (temp & PORT_PE)
 375                         status |= USB_PORT_STAT_ENABLE;
 376                 if (temp & PORT_OC)
 377                         status |= USB_PORT_STAT_OVERCURRENT;
 378                 if (temp & PORT_RESET)
 379                         status |= USB_PORT_STAT_RESET;
 380                 if (temp & PORT_POWER)
 381                         status |= USB_PORT_STAT_POWER;
 382                 if (bus_state->port_c_suspend & (1 << wIndex))
 383                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 384                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 385                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 386                 break;
 387         case SetPortFeature:
 388                 wIndex &= 0xff;
 389                 if (!wIndex || wIndex > ports)
 390                         goto error;
 391                 wIndex--;
 392                 temp = xhci_readl(xhci, port_array[wIndex]);
 393                 temp = xhci_port_state_to_neutral(temp);
 394                 switch (wValue) {
 395                 case USB_PORT_FEAT_SUSPEND:
 396                         temp = xhci_readl(xhci, port_array[wIndex]);
 397                         /* In spec software should not attempt to suspend
 398                          * a port unless the port reports that it is in the
 399                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 400                          */
 401                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 402                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 403                                 xhci_warn(xhci, "USB core suspending device "
 404                                           "not in U0/U1/U2.\n");
 405                                 goto error;
 406                         }
 407
 408                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 409                                         wIndex + 1);
 410                         if (!slot_id) {
 411                                 xhci_warn(xhci, "slot_id is zero\n");
 412                                 goto error;
 413                         }
 414                         /* unlock to execute stop endpoint commands */
 415                         spin_unlock_irqrestore(&xhci->lock, flags);
 416                         xhci_stop_device(xhci, slot_id, 1);
 417                         spin_lock_irqsave(&xhci->lock, flags);
 418
 419                         temp = xhci_port_state_to_neutral(temp);
 420                         temp &= ~PORT_PLS_MASK;
 421                         temp |= PORT_LINK_STROBE | XDEV_U3;
 422                         xhci_writel(xhci, temp, port_array[wIndex]);
 423
 424                         spin_unlock_irqrestore(&xhci->lock, flags);
 425                         msleep(10); /* wait device to enter */
 426                         spin_lock_irqsave(&xhci->lock, flags);
 427
 428                         temp = xhci_readl(xhci, port_array[wIndex]);
 429                         bus_state->suspended_ports |= 1 << wIndex;
 430                         break;
 431                 case USB_PORT_FEAT_POWER:
 432                         /*
 433                          * Turn on ports, even if there isn't per-port switching.
 434                          * HC will report connect events even before this is set.
 435                          * However, khubd will ignore the roothub events until
 436                          * the roothub is registered.
 437                          */
 438                         xhci_writel(xhci, temp | PORT_POWER,
 439                                         port_array[wIndex]);
 440
 441                         temp = xhci_readl(xhci, port_array[wIndex]);
 442                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 443                         break;
 444                 case USB_PORT_FEAT_RESET:
 445                         temp = (temp | PORT_RESET);
 446                         xhci_writel(xhci, temp, port_array[wIndex]);
 447
 448                         temp = xhci_readl(xhci, port_array[wIndex]);
 449                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 450                         break;
 451                 default:
 452                         goto error;
 453                 }
 454                 /* unblock any posted writes */
 455                 temp = xhci_readl(xhci, port_array[wIndex]);
 456                 break;
 457         case ClearPortFeature:
 458                 if (!wIndex || wIndex > ports)
 459                         goto error;
 460                 wIndex--;
 461                 temp = xhci_readl(xhci, port_array[wIndex]);
 462                 temp = xhci_port_state_to_neutral(temp);
 463                 switch (wValue) {
 464                 case USB_PORT_FEAT_SUSPEND:
 465                         temp = xhci_readl(xhci, port_array[wIndex]);
 466                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 467                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 468                         if (temp & PORT_RESET)
 469                                 goto error;
 470                         if (temp & XDEV_U3) {
 471                                 if ((temp & PORT_PE) == 0)
 472                                         goto error;
 473                                 if (DEV_SUPERSPEED(temp)) {
 474                                         temp = xhci_port_state_to_neutral(temp);
 475                                         temp &= ~PORT_PLS_MASK;
 476                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 477                                         xhci_writel(xhci, temp,
 478                                                         port_array[wIndex]);
 479                                         xhci_readl(xhci, port_array[wIndex]);
 480                                 } else {
 481                                         temp = xhci_port_state_to_neutral(temp);
 482                                         temp &= ~PORT_PLS_MASK;
 483                                         temp |= PORT_LINK_STROBE | XDEV_RESUME;
 484                                         xhci_writel(xhci, temp,
 485                                                         port_array[wIndex]);
 486
 487                                         spin_unlock_irqrestore(&xhci->lock,
 488                                                                flags);
 489                                         msleep(20);
 490                                         spin_lock_irqsave(&xhci->lock, flags);
 491
 492                                         temp = xhci_readl(xhci,
 493                                                         port_array[wIndex]);
 494                                         temp = xhci_port_state_to_neutral(temp);
 495                                         temp &= ~PORT_PLS_MASK;
 496                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 497                                         xhci_writel(xhci, temp,
 498                                                         port_array[wIndex]);
 499                                 }
 500                                 bus_state->port_c_suspend |= 1 << wIndex;
 501                         }
 502
 503                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 504                                         wIndex + 1);
 505                         if (!slot_id) {
 506                                 xhci_dbg(xhci, "slot_id is zero\n");
 507                                 goto error;
 508                         }
 509                         xhci_ring_device(xhci, slot_id);
 510                         break;
 511                 case USB_PORT_FEAT_C_SUSPEND:
 512                         bus_state->port_c_suspend &= ~(1 << wIndex);
 513                 case USB_PORT_FEAT_C_RESET:
 514                 case USB_PORT_FEAT_C_CONNECTION:
 515                 case USB_PORT_FEAT_C_OVER_CURRENT:
 516                 case USB_PORT_FEAT_C_ENABLE:
 517                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 518                                         port_array[wIndex], temp);
 519                         break;
 520                 case USB_PORT_FEAT_ENABLE:
 521                         xhci_disable_port(xhci, wIndex,
 522                                         port_array[wIndex], temp);
 523                         break;
 524                 default:
 525                         goto error;
 526                 }
 527                 break;
 528         default:
 529 error:
 530                 /* "stall" on error */
 531                 retval = -EPIPE;
 532         }
 533         spin_unlock_irqrestore(&xhci->lock, flags);
 534         return retval;
 535 }
 536
 537 /*
 538  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 539  * Ports are 0-indexed from the HCD point of view,
 540  * and 1-indexed from the USB core pointer of view.
 541  *
 542  * Note that the status change bits will be cleared as soon as a port status
 543  * change event is generated, so we use the saved status from that event.
 544  */
 545 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 546 {
 547         unsigned long flags;
 548         u32 temp, status;
 549         u32 mask;
 550         int i, retval;
 551         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 552         int ports;
 553         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
 554         struct xhci_bus_state *bus_state;
 555
 556         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 557         for (i = 0; i < ports; i++) {
 558                 if (i < xhci->num_usb3_ports)
 559                         port_array[i] = xhci->usb3_ports[i];
 560                 else
 561                         port_array[i] =
 562                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
 563         }
 564         bus_state = &xhci->bus_state[hcd_index(hcd)];
 565
 566         /* Initial status is no changes */
 567         retval = (ports + 8) / 8;
 568         memset(buf, 0, retval);
 569         status = 0;
 570
 571         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 572
 573         spin_lock_irqsave(&xhci->lock, flags);
 574         /* For each port, did anything change?  If so, set that bit in buf. */
 575         for (i = 0; i < ports; i++) {
 576                 temp = xhci_readl(xhci, port_array[i]);
 577                 if ((temp & mask) != 0 ||
 578                         (bus_state->port_c_suspend & 1 << i) ||
 579                         (bus_state->resume_done[i] && time_after_eq(
 580                             jiffies, bus_state->resume_done[i]))) {
 581                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 582                         status = 1;
 583                 }
 584         }
 585         spin_unlock_irqrestore(&xhci->lock, flags);
 586         return status ? retval : 0;
 587 }
 588
 589 #ifdef CONFIG_PM
 590
 591 int xhci_bus_suspend(struct usb_hcd *hcd)
 592 {
 593         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 594         int max_ports, port_index;
 595         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
 596         int i;
 597         struct xhci_bus_state *bus_state;
 598         unsigned long flags;
 599
 600         xhci_dbg(xhci, "suspend root hub\n");
 601         max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
 602         for (i = 0; i < max_ports; i++) {
 603                 if (i < xhci->num_usb3_ports)
 604                         port_array[i] = xhci->usb3_ports[i];
 605                 else
 606                         port_array[i] =
 607                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
 608         }
 609         bus_state = &xhci->bus_state[hcd_index(hcd)];
 610
 611         spin_lock_irqsave(&xhci->lock, flags);
 612
 613         if (hcd->self.root_hub->do_remote_wakeup) {
 614                 port_index = max_ports;
 615                 while (port_index--) {
 616                         if (bus_state->resume_done[port_index] != 0) {
 617                                 spin_unlock_irqrestore(&xhci->lock, flags);
 618                                 xhci_dbg(xhci, "suspend failed because "
 619                                                 "port %d is resuming\n",
 620                                                 port_index + 1);
 621                                 return -EBUSY;
 622                         }
 623                 }
 624         }
 625
 626         port_index = max_ports;
 627         bus_state->bus_suspended = 0;
 628         while (port_index--) {
 629                 /* suspend the port if the port is not suspended */
 630                 u32 t1, t2;
 631                 int slot_id;
 632
 633                 t1 = xhci_readl(xhci, port_array[port_index]);
 634                 t2 = xhci_port_state_to_neutral(t1);
 635
 636                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 637                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
 638                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 639                                         port_index + 1);
 640                         if (slot_id) {
 641                                 spin_unlock_irqrestore(&xhci->lock, flags);
 642                                 xhci_stop_device(xhci, slot_id, 1);
 643                                 spin_lock_irqsave(&xhci->lock, flags);
 644                         }
 645                         t2 &= ~PORT_PLS_MASK;
 646                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 647                         set_bit(port_index, &bus_state->bus_suspended);
 648                 }
 649                 if (hcd->self.root_hub->do_remote_wakeup) {
 650                         if (t1 & PORT_CONNECT) {
 651                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 652                                 t2 &= ~PORT_WKCONN_E;
 653                         } else {
 654                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 655                                 t2 &= ~PORT_WKDISC_E;
 656                         }
 657                 } else
 658                         t2 &= ~PORT_WAKE_BITS;
 659
 660                 t1 = xhci_port_state_to_neutral(t1);
 661                 if (t1 != t2)
 662                         xhci_writel(xhci, t2, port_array[port_index]);
 663
 664                 if (DEV_HIGHSPEED(t1)) {
 665                         /* enable remote wake up for USB 2.0 */
 666                         u32 __iomem *addr;
 667                         u32 tmp;
 668
 669                         /* Add one to the port status register address to get
 670                          * the port power control register address.
 671                          */
 672                         addr = port_array[port_index] + 1;
 673                         tmp = xhci_readl(xhci, addr);
 674                         tmp |= PORT_RWE;
 675                         xhci_writel(xhci, tmp, addr);
 676                 }
 677         }
 678         hcd->state = HC_STATE_SUSPENDED;
 679         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
 680         spin_unlock_irqrestore(&xhci->lock, flags);
 681         return 0;
 682 }
 683
 684 int xhci_bus_resume(struct usb_hcd *hcd)
 685 {
 686         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 687         int max_ports, port_index;
 688         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
 689         int i;
 690         struct xhci_bus_state *bus_state;
 691         u32 temp;
 692         unsigned long flags;
 693
 694         xhci_dbg(xhci, "resume root hub\n");
 695         max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
 696         for (i = 0; i < max_ports; i++) {
 697                 if (i < xhci->num_usb3_ports)
 698                         port_array[i] = xhci->usb3_ports[i];
 699                 else
 700                         port_array[i] =
 701                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
 702         }
 703         bus_state = &xhci->bus_state[hcd_index(hcd)];
 704
 705         if (time_before(jiffies, bus_state->next_statechange))
 706                 msleep(5);
 707
 708         spin_lock_irqsave(&xhci->lock, flags);
 709         if (!HCD_HW_ACCESSIBLE(hcd)) {
 710                 spin_unlock_irqrestore(&xhci->lock, flags);
 711                 return -ESHUTDOWN;
 712         }
 713
 714         /* delay the irqs */
 715         temp = xhci_readl(xhci, &xhci->op_regs->command);
 716         temp &= ~CMD_EIE;
 717         xhci_writel(xhci, temp, &xhci->op_regs->command);
 718
 719         port_index = max_ports;
 720         while (port_index--) {
 721                 /* Check whether need resume ports. If needed
 722                    resume port and disable remote wakeup */
 723                 u32 temp;
 724                 int slot_id;
 725
 726                 temp = xhci_readl(xhci, port_array[port_index]);
 727                 if (DEV_SUPERSPEED(temp))
 728                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 729                 else
 730                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 731                 if (test_bit(port_index, &bus_state->bus_suspended) &&
 732                     (temp & PORT_PLS_MASK)) {
 733                         if (DEV_SUPERSPEED(temp)) {
 734                                 temp = xhci_port_state_to_neutral(temp);
 735                                 temp &= ~PORT_PLS_MASK;
 736                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 737                                 xhci_writel(xhci, temp, port_array[port_index]);
 738                         } else {
 739                                 temp = xhci_port_state_to_neutral(temp);
 740                                 temp &= ~PORT_PLS_MASK;
 741                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 742                                 xhci_writel(xhci, temp, port_array[port_index]);
 743
 744                                 spin_unlock_irqrestore(&xhci->lock, flags);
 745                                 msleep(20);
 746                                 spin_lock_irqsave(&xhci->lock, flags);
 747
 748                                 temp = xhci_readl(xhci, port_array[port_index]);
 749                                 temp = xhci_port_state_to_neutral(temp);
 750                                 temp &= ~PORT_PLS_MASK;
 751                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 752                                 xhci_writel(xhci, temp, port_array[port_index]);
 753                         }
 754                         slot_id = xhci_find_slot_id_by_port(hcd,
 755                                         xhci, port_index + 1);
 756                         if (slot_id)
 757                                 xhci_ring_device(xhci, slot_id);
 758                 } else
 759                         xhci_writel(xhci, temp, port_array[port_index]);
 760
 761                 if (DEV_HIGHSPEED(temp)) {
 762                         /* disable remote wake up for USB 2.0 */
 763                         u32 __iomem *addr;
 764                         u32 tmp;
 765
 766                         /* Add one to the port status register address to get
 767                          * the port power control register address.
 768                          */
 769                         addr = port_array[port_index] + 1;
 770                         tmp = xhci_readl(xhci, addr);
 771                         tmp &= ~PORT_RWE;
 772                         xhci_writel(xhci, tmp, addr);
 773                 }
 774         }
 775
 776         (void) xhci_readl(xhci, &xhci->op_regs->command);
 777
 778         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
 779         /* re-enable irqs */
 780         temp = xhci_readl(xhci, &xhci->op_regs->command);
 781         temp |= CMD_EIE;
 782         xhci_writel(xhci, temp, &xhci->op_regs->command);
 783         temp = xhci_readl(xhci, &xhci->op_regs->command);
 784
 785         spin_unlock_irqrestore(&xhci->lock, flags);
 786         return 0;
 787 }
 788
 789 #endif  /* CONFIG_PM */