drivers/usb/host/xhci-hub.c

   1 /*
   2  * xHCI host controller driver
   3  *
   4  * Copyright (C) 2008 Intel Corp.
   5  *
   6  * Author: Sarah Sharp
   7  * Some code borrowed from the Linux EHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <asm/unaligned.h>
  24
  25 #include "xhci.h"
  26
  27 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  28 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  29                          PORT_RC | PORT_PLC | PORT_PE)
  30
  31 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
  32                 struct usb_hub_descriptor *desc, int ports)
  33 {
  34         u16 temp;
  35
  36         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
  37         desc->bHubContrCurrent = 0;
  38
  39         desc->bNbrPorts = ports;
  40         /* Ugh, these should be #defines, FIXME */
  41         /* Using table 11-13 in USB 2.0 spec. */
  42         temp = 0;
  43         /* Bits 1:0 - support port power switching, or power always on */
  44         if (HCC_PPC(xhci->hcc_params))
  45                 temp |= 0x0001;
  46         else
  47                 temp |= 0x0002;
  48         /* Bit  2 - root hubs are not part of a compound device */
  49         /* Bits 4:3 - individual port over current protection */
  50         temp |= 0x0008;
  51         /* Bits 6:5 - no TTs in root ports */
  52         /* Bit  7 - no port indicators */
  53         desc->wHubCharacteristics = cpu_to_le16(temp);
  54 }
  55
  56 /* Fill in the USB 2.0 roothub descriptor */
  57 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
  58                 struct usb_hub_descriptor *desc)
  59 {
  60         int ports;
  61         u16 temp;
  62         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
  63         u32 portsc;
  64         unsigned int i;
  65
  66         ports = xhci->num_usb2_ports;
  67
  68         xhci_common_hub_descriptor(xhci, desc, ports);
  69         desc->bDescriptorType = 0x29;
  70         temp = 1 + (ports / 8);
  71         desc->bDescLength = 7 + 2 * temp;
  72
  73         /* The Device Removable bits are reported on a byte granularity.
  74          * If the port doesn't exist within that byte, the bit is set to 0.
  75          */
  76         memset(port_removable, 0, sizeof(port_removable));
  77         for (i = 0; i < ports; i++) {
  78                 portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
  79                 /* If a device is removable, PORTSC reports a 0, same as in the
  80                  * hub descriptor DeviceRemovable bits.
  81                  */
  82                 if (portsc & PORT_DEV_REMOVE)
  83                         /* This math is hairy because bit 0 of DeviceRemovable
  84                          * is reserved, and bit 1 is for port 1, etc.
  85                          */
  86                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
  87         }
  88
  89         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
  90          * ports on it.  The USB 2.0 specification says that there are two
  91          * variable length fields at the end of the hub descriptor:
  92          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
  93          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
  94          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
  95          * 0xFF, so we initialize the both arrays (DeviceRemovable and
  96          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
  97          * set of ports that actually exist.
  98          */
  99         memset(desc->u.hs.DeviceRemovable, 0xff,
 100                         sizeof(desc->u.hs.DeviceRemovable));
 101         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 102                         sizeof(desc->u.hs.PortPwrCtrlMask));
 103
 104         for (i = 0; i < (ports + 1 + 7) / 8; i++)
 105                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 106                                 sizeof(__u8));
 107 }
 108
 109 /* Fill in the USB 3.0 roothub descriptor */
 110 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 111                 struct usb_hub_descriptor *desc)
 112 {
 113         int ports;
 114         u16 port_removable;
 115         u32 portsc;
 116         unsigned int i;
 117
 118         ports = xhci->num_usb3_ports;
 119         xhci_common_hub_descriptor(xhci, desc, ports);
 120         desc->bDescriptorType = 0x2a;
 121         desc->bDescLength = 12;
 122
 123         /* header decode latency should be zero for roothubs,
 124          * see section 4.23.5.2.
 125          */
 126         desc->u.ss.bHubHdrDecLat = 0;
 127         desc->u.ss.wHubDelay = 0;
 128
 129         port_removable = 0;
 130         /* bit 0 is reserved, bit 1 is for port 1, etc. */
 131         for (i = 0; i < ports; i++) {
 132                 portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
 133                 if (portsc & PORT_DEV_REMOVE)
 134                         port_removable |= 1 << (i + 1);
 135         }
 136         memset(&desc->u.ss.DeviceRemovable,
 137                         (__force __u16) cpu_to_le16(port_removable),
 138                         sizeof(__u16));
 139 }
 140
 141 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 142                 struct usb_hub_descriptor *desc)
 143 {
 144
 145         if (hcd->speed == HCD_USB3)
 146                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
 147         else
 148                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
 149
 150 }
 151
 152 static unsigned int xhci_port_speed(unsigned int port_status)
 153 {
 154         if (DEV_LOWSPEED(port_status))
 155                 return USB_PORT_STAT_LOW_SPEED;
 156         if (DEV_HIGHSPEED(port_status))
 157                 return USB_PORT_STAT_HIGH_SPEED;
 158         /*
 159          * FIXME: Yes, we should check for full speed, but the core uses that as
 160          * a default in portspeed() in usb/core/hub.c (which is the only place
 161          * USB_PORT_STAT_*_SPEED is used).
 162          */
 163         return 0;
 164 }
 165
 166 /*
 167  * These bits are Read Only (RO) and should be saved and written to the
 168  * registers: 0, 3, 10:13, 30
 169  * connect status, over-current status, port speed, and device removable.
 170  * connect status and port speed are also sticky - meaning they're in
 171  * the AUX well and they aren't changed by a hot, warm, or cold reset.
 172  */
 173 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 174 /*
 175  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 176  * bits 5:8, 9, 14:15, 25:27
 177  * link state, port power, port indicator state, "wake on" enable state
 178  */
 179 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 180 /*
 181  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 182  * bit 4 (port reset)
 183  */
 184 #define XHCI_PORT_RW1S  ((1<<4))
 185 /*
 186  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 187  * bits 1, 17, 18, 19, 20, 21, 22, 23
 188  * port enable/disable, and
 189  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 190  * over-current, reset, link state, and L1 change
 191  */
 192 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 193 /*
 194  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 195  * latched in
 196  */
 197 #define XHCI_PORT_RW    ((1<<16))
 198 /*
 199  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 200  * bits 2, 24, 28:31
 201  */
 202 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 203
 204 /*
 205  * Given a port state, this function returns a value that would result in the
 206  * port being in the same state, if the value was written to the port status
 207  * control register.
 208  * Save Read Only (RO) bits and save read/write bits where
 209  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 210  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 211  */
 212 u32 xhci_port_state_to_neutral(u32 state)
 213 {
 214         /* Save read-only status and port state */
 215         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 216 }
 217
 218 /*
 219  * find slot id based on port number.
 220  * @port: The one-based port number from one of the two split roothubs.
 221  */
 222 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 223                 u16 port)
 224 {
 225         int slot_id;
 226         int i;
 227         enum usb_device_speed speed;
 228
 229         slot_id = 0;
 230         for (i = 0; i < MAX_HC_SLOTS; i++) {
 231                 if (!xhci->devs[i])
 232                         continue;
 233                 speed = xhci->devs[i]->udev->speed;
 234                 if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3))
 235                                 && xhci->devs[i]->port == port) {
 236                         slot_id = i;
 237                         break;
 238                 }
 239         }
 240
 241         return slot_id;
 242 }
 243
 244 /*
 245  * Stop device
 246  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 247  * to complete.
 248  * suspend will set to 1, if suspend bit need to set in command.
 249  */
 250 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 251 {
 252         struct xhci_virt_device *virt_dev;
 253         struct xhci_command *cmd;
 254         unsigned long flags;
 255         int timeleft;
 256         int ret;
 257         int i;
 258
 259         ret = 0;
 260         virt_dev = xhci->devs[slot_id];
 261         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
 262         if (!cmd) {
 263                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
 264                 return -ENOMEM;
 265         }
 266
 267         spin_lock_irqsave(&xhci->lock, flags);
 268         for (i = LAST_EP_INDEX; i > 0; i--) {
 269                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
 270                         xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
 271         }
 272         cmd->command_trb = xhci->cmd_ring->enqueue;
 273         list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
 274         xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
 275         xhci_ring_cmd_db(xhci);
 276         spin_unlock_irqrestore(&xhci->lock, flags);
 277
 278         /* Wait for last stop endpoint command to finish */
 279         timeleft = wait_for_completion_interruptible_timeout(
 280                         cmd->completion,
 281                         USB_CTRL_SET_TIMEOUT);
 282         if (timeleft <= 0) {
 283                 xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
 284                                 timeleft == 0 ? "Timeout" : "Signal");
 285                 spin_lock_irqsave(&xhci->lock, flags);
 286                 /* The timeout might have raced with the event ring handler, so
 287                  * only delete from the list if the item isn't poisoned.
 288                  */
 289                 if (cmd->cmd_list.next != LIST_POISON1)
 290                         list_del(&cmd->cmd_list);
 291                 spin_unlock_irqrestore(&xhci->lock, flags);
 292                 ret = -ETIME;
 293                 goto command_cleanup;
 294         }
 295
 296 command_cleanup:
 297         xhci_free_command(xhci, cmd);
 298         return ret;
 299 }
 300
 301 /*
 302  * Ring device, it rings the all doorbells unconditionally.
 303  */
 304 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 305 {
 306         int i;
 307
 308         for (i = 0; i < LAST_EP_INDEX + 1; i++)
 309                 if (xhci->devs[slot_id]->eps[i].ring &&
 310                     xhci->devs[slot_id]->eps[i].ring->dequeue)
 311                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 312
 313         return;
 314 }
 315
 316 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 317                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 318 {
 319         /* Don't allow the USB core to disable SuperSpeed ports. */
 320         if (hcd->speed == HCD_USB3) {
 321                 xhci_dbg(xhci, "Ignoring request to disable "
 322                                 "SuperSpeed port.\n");
 323                 return;
 324         }
 325
 326         /* Write 1 to disable the port */
 327         xhci_writel(xhci, port_status | PORT_PE, addr);
 328         port_status = xhci_readl(xhci, addr);
 329         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 330                         wIndex, port_status);
 331 }
 332
 333 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 334                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 335 {
 336         char *port_change_bit;
 337         u32 status;
 338
 339         switch (wValue) {
 340         case USB_PORT_FEAT_C_RESET:
 341                 status = PORT_RC;
 342                 port_change_bit = "reset";
 343                 break;
 344         case USB_PORT_FEAT_C_BH_PORT_RESET:
 345                 status = PORT_WRC;
 346                 port_change_bit = "warm(BH) reset";
 347                 break;
 348         case USB_PORT_FEAT_C_CONNECTION:
 349                 status = PORT_CSC;
 350                 port_change_bit = "connect";
 351                 break;
 352         case USB_PORT_FEAT_C_OVER_CURRENT:
 353                 status = PORT_OCC;
 354                 port_change_bit = "over-current";
 355                 break;
 356         case USB_PORT_FEAT_C_ENABLE:
 357                 status = PORT_PEC;
 358                 port_change_bit = "enable/disable";
 359                 break;
 360         case USB_PORT_FEAT_C_SUSPEND:
 361                 status = PORT_PLC;
 362                 port_change_bit = "suspend/resume";
 363                 break;
 364         case USB_PORT_FEAT_C_PORT_LINK_STATE:
 365                 status = PORT_PLC;
 366                 port_change_bit = "link state";
 367                 break;
 368         default:
 369                 /* Should never happen */
 370                 return;
 371         }
 372         /* Change bits are all write 1 to clear */
 373         xhci_writel(xhci, port_status | status, addr);
 374         port_status = xhci_readl(xhci, addr);
 375         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 376                         port_change_bit, wIndex, port_status);
 377 }
 378
 379 static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
 380 {
 381         int max_ports;
 382         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 383
 384         if (hcd->speed == HCD_USB3) {
 385                 max_ports = xhci->num_usb3_ports;
 386                 *port_array = xhci->usb3_ports;
 387         } else {
 388                 max_ports = xhci->num_usb2_ports;
 389                 *port_array = xhci->usb2_ports;
 390         }
 391
 392         return max_ports;
 393 }
 394
 395 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 396                 u16 wIndex, char *buf, u16 wLength)
 397 {
 398         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 399         int max_ports;
 400         unsigned long flags;
 401         u32 temp, temp1, status;
 402         int retval = 0;
 403         __le32 __iomem **port_array;
 404         int slot_id;
 405         struct xhci_bus_state *bus_state;
 406         u16 link_state = 0;
 407
 408         max_ports = xhci_get_ports(hcd, &port_array);
 409         bus_state = &xhci->bus_state[hcd_index(hcd)];
 410
 411         spin_lock_irqsave(&xhci->lock, flags);
 412         switch (typeReq) {
 413         case GetHubStatus:
 414                 /* No power source, over-current reported per port */
 415                 memset(buf, 0, 4);
 416                 break;
 417         case GetHubDescriptor:
 418                 /* Check to make sure userspace is asking for the USB 3.0 hub
 419                  * descriptor for the USB 3.0 roothub.  If not, we stall the
 420                  * endpoint, like external hubs do.
 421                  */
 422                 if (hcd->speed == HCD_USB3 &&
 423                                 (wLength < USB_DT_SS_HUB_SIZE ||
 424                                  wValue != (USB_DT_SS_HUB << 8))) {
 425                         xhci_dbg(xhci, "Wrong hub descriptor type for "
 426                                         "USB 3.0 roothub.\n");
 427                         goto error;
 428                 }
 429                 xhci_hub_descriptor(hcd, xhci,
 430                                 (struct usb_hub_descriptor *) buf);
 431                 break;
 432         case GetPortStatus:
 433                 if (!wIndex || wIndex > max_ports)
 434                         goto error;
 435                 wIndex--;
 436                 status = 0;
 437                 temp = xhci_readl(xhci, port_array[wIndex]);
 438                 if (temp == 0xffffffff) {
 439                         retval = -ENODEV;
 440                         break;
 441                 }
 442                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 443
 444                 /* wPortChange bits */
 445                 if (temp & PORT_CSC)
 446                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 447                 if (temp & PORT_PEC)
 448                         status |= USB_PORT_STAT_C_ENABLE << 16;
 449                 if ((temp & PORT_OCC))
 450                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 451                 if ((temp & PORT_RC))
 452                         status |= USB_PORT_STAT_C_RESET << 16;
 453                 /* USB3.0 only */
 454                 if (hcd->speed == HCD_USB3) {
 455                         if ((temp & PORT_PLC))
 456                                 status |= USB_PORT_STAT_C_LINK_STATE << 16;
 457                         if ((temp & PORT_WRC))
 458                                 status |= USB_PORT_STAT_C_BH_RESET << 16;
 459                 }
 460
 461                 if (hcd->speed != HCD_USB3) {
 462                         if ((temp & PORT_PLS_MASK) == XDEV_U3
 463                                         && (temp & PORT_POWER))
 464                                 status |= USB_PORT_STAT_SUSPEND;
 465                 }
 466                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 467                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 468                                 goto error;
 469                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 470                                                 bus_state->resume_done[wIndex])) {
 471                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 472                                         wIndex + 1);
 473                                 bus_state->resume_done[wIndex] = 0;
 474                                 temp1 = xhci_port_state_to_neutral(temp);
 475                                 temp1 &= ~PORT_PLS_MASK;
 476                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 477                                 xhci_writel(xhci, temp1, port_array[wIndex]);
 478
 479                                 xhci_dbg(xhci, "set port %d resume\n",
 480                                         wIndex + 1);
 481                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 482                                                                  wIndex + 1);
 483                                 if (!slot_id) {
 484                                         xhci_dbg(xhci, "slot_id is zero\n");
 485                                         goto error;
 486                                 }
 487                                 xhci_ring_device(xhci, slot_id);
 488                                 bus_state->port_c_suspend |= 1 << wIndex;
 489                                 bus_state->suspended_ports &= ~(1 << wIndex);
 490                         }
 491                 }
 492                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 493                         && (temp & PORT_POWER)
 494                         && (bus_state->suspended_ports & (1 << wIndex))) {
 495                         bus_state->suspended_ports &= ~(1 << wIndex);
 496                         if (hcd->speed != HCD_USB3)
 497                                 bus_state->port_c_suspend |= 1 << wIndex;
 498                 }
 499                 if (temp & PORT_CONNECT) {
 500                         status |= USB_PORT_STAT_CONNECTION;
 501                         status |= xhci_port_speed(temp);
 502                 }
 503                 if (temp & PORT_PE)
 504                         status |= USB_PORT_STAT_ENABLE;
 505                 if (temp & PORT_OC)
 506                         status |= USB_PORT_STAT_OVERCURRENT;
 507                 if (temp & PORT_RESET)
 508                         status |= USB_PORT_STAT_RESET;
 509                 if (temp & PORT_POWER) {
 510                         if (hcd->speed == HCD_USB3)
 511                                 status |= USB_SS_PORT_STAT_POWER;
 512                         else
 513                                 status |= USB_PORT_STAT_POWER;
 514                 }
 515                 /* Port Link State */
 516                 if (hcd->speed == HCD_USB3) {
 517                         /* resume state is a xHCI internal state.
 518                          * Do not report it to usb core.
 519                          */
 520                         if ((temp & PORT_PLS_MASK) != XDEV_RESUME)
 521                                 status |= (temp & PORT_PLS_MASK);
 522                 }
 523                 if (bus_state->port_c_suspend & (1 << wIndex))
 524                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 525                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 526                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 527                 break;
 528         case SetPortFeature:
 529                 if (wValue == USB_PORT_FEAT_LINK_STATE)
 530                         link_state = (wIndex & 0xff00) >> 3;
 531                 wIndex &= 0xff;
 532                 if (!wIndex || wIndex > max_ports)
 533                         goto error;
 534                 wIndex--;
 535                 temp = xhci_readl(xhci, port_array[wIndex]);
 536                 if (temp == 0xffffffff) {
 537                         retval = -ENODEV;
 538                         break;
 539                 }
 540                 temp = xhci_port_state_to_neutral(temp);
 541                 /* FIXME: What new port features do we need to support? */
 542                 switch (wValue) {
 543                 case USB_PORT_FEAT_SUSPEND:
 544                         temp = xhci_readl(xhci, port_array[wIndex]);
 545                         /* In spec software should not attempt to suspend
 546                          * a port unless the port reports that it is in the
 547                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 548                          */
 549                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 550                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 551                                 xhci_warn(xhci, "USB core suspending device "
 552                                           "not in U0/U1/U2.\n");
 553                                 goto error;
 554                         }
 555
 556                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 557                                         wIndex + 1);
 558                         if (!slot_id) {
 559                                 xhci_warn(xhci, "slot_id is zero\n");
 560                                 goto error;
 561                         }
 562                         /* unlock to execute stop endpoint commands */
 563                         spin_unlock_irqrestore(&xhci->lock, flags);
 564                         xhci_stop_device(xhci, slot_id, 1);
 565                         spin_lock_irqsave(&xhci->lock, flags);
 566
 567                         temp = xhci_port_state_to_neutral(temp);
 568                         temp &= ~PORT_PLS_MASK;
 569                         temp |= PORT_LINK_STROBE | XDEV_U3;
 570                         xhci_writel(xhci, temp, port_array[wIndex]);
 571
 572                         spin_unlock_irqrestore(&xhci->lock, flags);
 573                         msleep(10); /* wait device to enter */
 574                         spin_lock_irqsave(&xhci->lock, flags);
 575
 576                         temp = xhci_readl(xhci, port_array[wIndex]);
 577                         bus_state->suspended_ports |= 1 << wIndex;
 578                         break;
 579                 case USB_PORT_FEAT_LINK_STATE:
 580                         temp = xhci_readl(xhci, port_array[wIndex]);
 581                         /* Software should not attempt to set
 582                          * port link state above '5' (Rx.Detect) and the port
 583                          * must be enabled.
 584                          */
 585                         if ((temp & PORT_PE) == 0 ||
 586                                 (link_state > USB_SS_PORT_LS_RX_DETECT)) {
 587                                 xhci_warn(xhci, "Cannot set link state.\n");
 588                                 goto error;
 589                         }
 590
 591                         if (link_state == USB_SS_PORT_LS_U3) {
 592                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 593                                                 wIndex + 1);
 594                                 if (slot_id) {
 595                                         /* unlock to execute stop endpoint
 596                                          * commands */
 597                                         spin_unlock_irqrestore(&xhci->lock,
 598                                                                 flags);
 599                                         xhci_stop_device(xhci, slot_id, 1);
 600                                         spin_lock_irqsave(&xhci->lock, flags);
 601                                 }
 602                         }
 603
 604                         temp = xhci_port_state_to_neutral(temp);
 605                         temp &= ~PORT_PLS_MASK;
 606                         temp |= PORT_LINK_STROBE | link_state;
 607                         xhci_writel(xhci, temp, port_array[wIndex]);
 608
 609                         spin_unlock_irqrestore(&xhci->lock, flags);
 610                         msleep(20); /* wait device to enter */
 611                         spin_lock_irqsave(&xhci->lock, flags);
 612
 613                         temp = xhci_readl(xhci, port_array[wIndex]);
 614                         if (link_state == USB_SS_PORT_LS_U3)
 615                                 bus_state->suspended_ports |= 1 << wIndex;
 616                         break;
 617                 case USB_PORT_FEAT_POWER:
 618                         /*
 619                          * Turn on ports, even if there isn't per-port switching.
 620                          * HC will report connect events even before this is set.
 621                          * However, khubd will ignore the roothub events until
 622                          * the roothub is registered.
 623                          */
 624                         xhci_writel(xhci, temp | PORT_POWER,
 625                                         port_array[wIndex]);
 626
 627                         temp = xhci_readl(xhci, port_array[wIndex]);
 628                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 629                         break;
 630                 case USB_PORT_FEAT_RESET:
 631                         temp = (temp | PORT_RESET);
 632                         xhci_writel(xhci, temp, port_array[wIndex]);
 633
 634                         temp = xhci_readl(xhci, port_array[wIndex]);
 635                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 636                         break;
 637                 case USB_PORT_FEAT_BH_PORT_RESET:
 638                         temp |= PORT_WR;
 639                         xhci_writel(xhci, temp, port_array[wIndex]);
 640
 641                         temp = xhci_readl(xhci, port_array[wIndex]);
 642                         break;
 643                 default:
 644                         goto error;
 645                 }
 646                 /* unblock any posted writes */
 647                 temp = xhci_readl(xhci, port_array[wIndex]);
 648                 break;
 649         case ClearPortFeature:
 650                 if (!wIndex || wIndex > max_ports)
 651                         goto error;
 652                 wIndex--;
 653                 temp = xhci_readl(xhci, port_array[wIndex]);
 654                 if (temp == 0xffffffff) {
 655                         retval = -ENODEV;
 656                         break;
 657                 }
 658                 /* FIXME: What new port features do we need to support? */
 659                 temp = xhci_port_state_to_neutral(temp);
 660                 switch (wValue) {
 661                 case USB_PORT_FEAT_SUSPEND:
 662                         temp = xhci_readl(xhci, port_array[wIndex]);
 663                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 664                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 665                         if (temp & PORT_RESET)
 666                                 goto error;
 667                         if (temp & XDEV_U3) {
 668                                 if ((temp & PORT_PE) == 0)
 669                                         goto error;
 670
 671                                 temp = xhci_port_state_to_neutral(temp);
 672                                 temp &= ~PORT_PLS_MASK;
 673                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 674                                 xhci_writel(xhci, temp,
 675                                                 port_array[wIndex]);
 676
 677                                 spin_unlock_irqrestore(&xhci->lock,
 678                                                        flags);
 679                                 msleep(20);
 680                                 spin_lock_irqsave(&xhci->lock, flags);
 681
 682                                 temp = xhci_readl(xhci,
 683                                                 port_array[wIndex]);
 684                                 temp = xhci_port_state_to_neutral(temp);
 685                                 temp &= ~PORT_PLS_MASK;
 686                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 687                                 xhci_writel(xhci, temp,
 688                                                 port_array[wIndex]);
 689                         }
 690                         bus_state->port_c_suspend |= 1 << wIndex;
 691
 692                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 693                                         wIndex + 1);
 694                         if (!slot_id) {
 695                                 xhci_dbg(xhci, "slot_id is zero\n");
 696                                 goto error;
 697                         }
 698                         xhci_ring_device(xhci, slot_id);
 699                         break;
 700                 case USB_PORT_FEAT_C_SUSPEND:
 701                         bus_state->port_c_suspend &= ~(1 << wIndex);
 702                 case USB_PORT_FEAT_C_RESET:
 703                 case USB_PORT_FEAT_C_BH_PORT_RESET:
 704                 case USB_PORT_FEAT_C_CONNECTION:
 705                 case USB_PORT_FEAT_C_OVER_CURRENT:
 706                 case USB_PORT_FEAT_C_ENABLE:
 707                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
 708                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 709                                         port_array[wIndex], temp);
 710                         break;
 711                 case USB_PORT_FEAT_ENABLE:
 712                         xhci_disable_port(hcd, xhci, wIndex,
 713                                         port_array[wIndex], temp);
 714                         break;
 715                 default:
 716                         goto error;
 717                 }
 718                 break;
 719         default:
 720 error:
 721                 /* "stall" on error */
 722                 retval = -EPIPE;
 723         }
 724         spin_unlock_irqrestore(&xhci->lock, flags);
 725         return retval;
 726 }
 727
 728 /*
 729  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 730  * Ports are 0-indexed from the HCD point of view,
 731  * and 1-indexed from the USB core pointer of view.
 732  *
 733  * Note that the status change bits will be cleared as soon as a port status
 734  * change event is generated, so we use the saved status from that event.
 735  */
 736 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 737 {
 738         unsigned long flags;
 739         u32 temp, status;
 740         u32 mask;
 741         int i, retval;
 742         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 743         int max_ports;
 744         __le32 __iomem **port_array;
 745         struct xhci_bus_state *bus_state;
 746
 747         max_ports = xhci_get_ports(hcd, &port_array);
 748         bus_state = &xhci->bus_state[hcd_index(hcd)];
 749
 750         /* Initial status is no changes */
 751         retval = (max_ports + 8) / 8;
 752         memset(buf, 0, retval);
 753         status = 0;
 754
 755         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC;
 756
 757         spin_lock_irqsave(&xhci->lock, flags);
 758         /* For each port, did anything change?  If so, set that bit in buf. */
 759         for (i = 0; i < max_ports; i++) {
 760                 temp = xhci_readl(xhci, port_array[i]);
 761                 if (temp == 0xffffffff) {
 762                         retval = -ENODEV;
 763                         break;
 764                 }
 765                 if ((temp & mask) != 0 ||
 766                         (bus_state->port_c_suspend & 1 << i) ||
 767                         (bus_state->resume_done[i] && time_after_eq(
 768                             jiffies, bus_state->resume_done[i]))) {
 769                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 770                         status = 1;
 771                 }
 772         }
 773         spin_unlock_irqrestore(&xhci->lock, flags);
 774         return status ? retval : 0;
 775 }
 776
 777 #ifdef CONFIG_PM
 778
 779 int xhci_bus_suspend(struct usb_hcd *hcd)
 780 {
 781         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 782         int max_ports, port_index;
 783         __le32 __iomem **port_array;
 784         struct xhci_bus_state *bus_state;
 785         unsigned long flags;
 786
 787         max_ports = xhci_get_ports(hcd, &port_array);
 788         bus_state = &xhci->bus_state[hcd_index(hcd)];
 789
 790         spin_lock_irqsave(&xhci->lock, flags);
 791
 792         if (hcd->self.root_hub->do_remote_wakeup) {
 793                 port_index = max_ports;
 794                 while (port_index--) {
 795                         if (bus_state->resume_done[port_index] != 0) {
 796                                 spin_unlock_irqrestore(&xhci->lock, flags);
 797                                 xhci_dbg(xhci, "suspend failed because "
 798                                                 "port %d is resuming\n",
 799                                                 port_index + 1);
 800                                 return -EBUSY;
 801                         }
 802                 }
 803         }
 804
 805         port_index = max_ports;
 806         bus_state->bus_suspended = 0;
 807         while (port_index--) {
 808                 /* suspend the port if the port is not suspended */
 809                 u32 t1, t2;
 810                 int slot_id;
 811
 812                 t1 = xhci_readl(xhci, port_array[port_index]);
 813                 t2 = xhci_port_state_to_neutral(t1);
 814
 815                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 816                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
 817                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 818                                         port_index + 1);
 819                         if (slot_id) {
 820                                 spin_unlock_irqrestore(&xhci->lock, flags);
 821                                 xhci_stop_device(xhci, slot_id, 1);
 822                                 spin_lock_irqsave(&xhci->lock, flags);
 823                         }
 824                         t2 &= ~PORT_PLS_MASK;
 825                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 826                         set_bit(port_index, &bus_state->bus_suspended);
 827                 }
 828                 if (hcd->self.root_hub->do_remote_wakeup) {
 829                         if (t1 & PORT_CONNECT) {
 830                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 831                                 t2 &= ~PORT_WKCONN_E;
 832                         } else {
 833                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 834                                 t2 &= ~PORT_WKDISC_E;
 835                         }
 836                 } else
 837                         t2 &= ~PORT_WAKE_BITS;
 838
 839                 t1 = xhci_port_state_to_neutral(t1);
 840                 if (t1 != t2)
 841                         xhci_writel(xhci, t2, port_array[port_index]);
 842
 843                 if (hcd->speed != HCD_USB3) {
 844                         /* enable remote wake up for USB 2.0 */
 845                         __le32 __iomem *addr;
 846                         u32 tmp;
 847
 848                         /* Add one to the port status register address to get
 849                          * the port power control register address.
 850                          */
 851                         addr = port_array[port_index] + 1;
 852                         tmp = xhci_readl(xhci, addr);
 853                         tmp |= PORT_RWE;
 854                         xhci_writel(xhci, tmp, addr);
 855                 }
 856         }
 857         hcd->state = HC_STATE_SUSPENDED;
 858         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
 859         spin_unlock_irqrestore(&xhci->lock, flags);
 860         return 0;
 861 }
 862
 863 int xhci_bus_resume(struct usb_hcd *hcd)
 864 {
 865         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 866         int max_ports, port_index;
 867         __le32 __iomem **port_array;
 868         struct xhci_bus_state *bus_state;
 869         u32 temp;
 870         unsigned long flags;
 871
 872         max_ports = xhci_get_ports(hcd, &port_array);
 873         bus_state = &xhci->bus_state[hcd_index(hcd)];
 874
 875         if (time_before(jiffies, bus_state->next_statechange))
 876                 msleep(5);
 877
 878         spin_lock_irqsave(&xhci->lock, flags);
 879         if (!HCD_HW_ACCESSIBLE(hcd)) {
 880                 spin_unlock_irqrestore(&xhci->lock, flags);
 881                 return -ESHUTDOWN;
 882         }
 883
 884         /* delay the irqs */
 885         temp = xhci_readl(xhci, &xhci->op_regs->command);
 886         temp &= ~CMD_EIE;
 887         xhci_writel(xhci, temp, &xhci->op_regs->command);
 888
 889         port_index = max_ports;
 890         while (port_index--) {
 891                 /* Check whether need resume ports. If needed
 892                    resume port and disable remote wakeup */
 893                 u32 temp;
 894                 int slot_id;
 895
 896                 temp = xhci_readl(xhci, port_array[port_index]);
 897                 if (DEV_SUPERSPEED(temp))
 898                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 899                 else
 900                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 901                 if (test_bit(port_index, &bus_state->bus_suspended) &&
 902                     (temp & PORT_PLS_MASK)) {
 903                         if (DEV_SUPERSPEED(temp)) {
 904                                 temp = xhci_port_state_to_neutral(temp);
 905                                 temp &= ~PORT_PLS_MASK;
 906                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 907                                 xhci_writel(xhci, temp, port_array[port_index]);
 908                         } else {
 909                                 temp = xhci_port_state_to_neutral(temp);
 910                                 temp &= ~PORT_PLS_MASK;
 911                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 912                                 xhci_writel(xhci, temp, port_array[port_index]);
 913
 914                                 spin_unlock_irqrestore(&xhci->lock, flags);
 915                                 msleep(20);
 916                                 spin_lock_irqsave(&xhci->lock, flags);
 917
 918                                 temp = xhci_readl(xhci, port_array[port_index]);
 919                                 temp = xhci_port_state_to_neutral(temp);
 920                                 temp &= ~PORT_PLS_MASK;
 921                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 922                                 xhci_writel(xhci, temp, port_array[port_index]);
 923                         }
 924                         /* wait for the port to enter U0 and report port link
 925                          * state change.
 926                          */
 927                         spin_unlock_irqrestore(&xhci->lock, flags);
 928                         msleep(20);
 929                         spin_lock_irqsave(&xhci->lock, flags);
 930
 931                         /* Clear PLC */
 932                         temp = xhci_readl(xhci, port_array[port_index]);
 933                         if (temp & PORT_PLC) {
 934                                 temp = xhci_port_state_to_neutral(temp);
 935                                 temp |= PORT_PLC;
 936                                 xhci_writel(xhci, temp, port_array[port_index]);
 937                         }
 938
 939                         slot_id = xhci_find_slot_id_by_port(hcd,
 940                                         xhci, port_index + 1);
 941                         if (slot_id)
 942                                 xhci_ring_device(xhci, slot_id);
 943                 } else
 944                         xhci_writel(xhci, temp, port_array[port_index]);
 945
 946                 if (hcd->speed != HCD_USB3) {
 947                         /* disable remote wake up for USB 2.0 */
 948                         __le32 __iomem *addr;
 949                         u32 tmp;
 950
 951                         /* Add one to the port status register address to get
 952                          * the port power control register address.
 953                          */
 954                         addr = port_array[port_index] + 1;
 955                         tmp = xhci_readl(xhci, addr);
 956                         tmp &= ~PORT_RWE;
 957                         xhci_writel(xhci, tmp, addr);
 958                 }
 959         }
 960
 961         (void) xhci_readl(xhci, &xhci->op_regs->command);
 962
 963         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
 964         /* re-enable irqs */
 965         temp = xhci_readl(xhci, &xhci->op_regs->command);
 966         temp |= CMD_EIE;
 967         xhci_writel(xhci, temp, &xhci->op_regs->command);
 968         temp = xhci_readl(xhci, &xhci->op_regs->command);
 969
 970         spin_unlock_irqrestore(&xhci->lock, flags);
 971         return 0;
 972 }
 973
 974 #endif  /* CONFIG_PM */