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 = (__force __u16) 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, u32 __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, u32 __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_CONNECTION:
 345                 status = PORT_CSC;
 346                 port_change_bit = "connect";
 347                 break;
 348         case USB_PORT_FEAT_C_OVER_CURRENT:
 349                 status = PORT_OCC;
 350                 port_change_bit = "over-current";
 351                 break;
 352         case USB_PORT_FEAT_C_ENABLE:
 353                 status = PORT_PEC;
 354                 port_change_bit = "enable/disable";
 355                 break;
 356         case USB_PORT_FEAT_C_SUSPEND:
 357                 status = PORT_PLC;
 358                 port_change_bit = "suspend/resume";
 359                 break;
 360         default:
 361                 /* Should never happen */
 362                 return;
 363         }
 364         /* Change bits are all write 1 to clear */
 365         xhci_writel(xhci, port_status | status, addr);
 366         port_status = xhci_readl(xhci, addr);
 367         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 368                         port_change_bit, wIndex, port_status);
 369 }
 370
 371 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 372                 u16 wIndex, char *buf, u16 wLength)
 373 {
 374         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 375         int ports;
 376         unsigned long flags;
 377         u32 temp, temp1, status;
 378         int retval = 0;
 379         u32 __iomem **port_array;
 380         int slot_id;
 381         struct xhci_bus_state *bus_state;
 382
 383         if (hcd->speed == HCD_USB3) {
 384                 ports = xhci->num_usb3_ports;
 385                 port_array = xhci->usb3_ports;
 386         } else {
 387                 ports = xhci->num_usb2_ports;
 388                 port_array = xhci->usb2_ports;
 389         }
 390         bus_state = &xhci->bus_state[hcd_index(hcd)];
 391
 392         spin_lock_irqsave(&xhci->lock, flags);
 393         switch (typeReq) {
 394         case GetHubStatus:
 395                 /* No power source, over-current reported per port */
 396                 memset(buf, 0, 4);
 397                 break;
 398         case GetHubDescriptor:
 399                 /* Check to make sure userspace is asking for the USB 3.0 hub
 400                  * descriptor for the USB 3.0 roothub.  If not, we stall the
 401                  * endpoint, like external hubs do.
 402                  */
 403                 if (hcd->speed == HCD_USB3 &&
 404                                 (wLength < USB_DT_SS_HUB_SIZE ||
 405                                  wValue != (USB_DT_SS_HUB << 8))) {
 406                         xhci_dbg(xhci, "Wrong hub descriptor type for "
 407                                         "USB 3.0 roothub.\n");
 408                         goto error;
 409                 }
 410                 xhci_hub_descriptor(hcd, xhci,
 411                                 (struct usb_hub_descriptor *) buf);
 412                 break;
 413         case GetPortStatus:
 414                 if (!wIndex || wIndex > ports)
 415                         goto error;
 416                 wIndex--;
 417                 status = 0;
 418                 temp = xhci_readl(xhci, port_array[wIndex]);
 419                 if (temp == 0xffffffff) {
 420                         retval = -ENODEV;
 421                         break;
 422                 }
 423                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
 424
 425                 /* FIXME - should we return a port status value like the USB
 426                  * 3.0 external hubs do?
 427                  */
 428                 /* wPortChange bits */
 429                 if (temp & PORT_CSC)
 430                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 431                 if (temp & PORT_PEC)
 432                         status |= USB_PORT_STAT_C_ENABLE << 16;
 433                 if ((temp & PORT_OCC))
 434                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 435                 /*
 436                  * FIXME ignoring reset and USB 2.1/3.0 specific
 437                  * changes
 438                  */
 439                 if ((temp & PORT_PLS_MASK) == XDEV_U3
 440                         && (temp & PORT_POWER))
 441                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 442                 if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
 443                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
 444                                 goto error;
 445                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
 446                                                 bus_state->resume_done[wIndex])) {
 447                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
 448                                         wIndex + 1);
 449                                 bus_state->resume_done[wIndex] = 0;
 450                                 temp1 = xhci_port_state_to_neutral(temp);
 451                                 temp1 &= ~PORT_PLS_MASK;
 452                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
 453                                 xhci_writel(xhci, temp1, port_array[wIndex]);
 454
 455                                 xhci_dbg(xhci, "set port %d resume\n",
 456                                         wIndex + 1);
 457                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 458                                                                  wIndex + 1);
 459                                 if (!slot_id) {
 460                                         xhci_dbg(xhci, "slot_id is zero\n");
 461                                         goto error;
 462                                 }
 463                                 xhci_ring_device(xhci, slot_id);
 464                                 bus_state->port_c_suspend |= 1 << wIndex;
 465                                 bus_state->suspended_ports &= ~(1 << wIndex);
 466                         }
 467                 }
 468                 if ((temp & PORT_PLS_MASK) == XDEV_U0
 469                         && (temp & PORT_POWER)
 470                         && (bus_state->suspended_ports & (1 << wIndex))) {
 471                         bus_state->suspended_ports &= ~(1 << wIndex);
 472                         bus_state->port_c_suspend |= 1 << wIndex;
 473                 }
 474                 if (temp & PORT_CONNECT) {
 475                         status |= USB_PORT_STAT_CONNECTION;
 476                         status |= xhci_port_speed(temp);
 477                 }
 478                 if (temp & PORT_PE)
 479                         status |= USB_PORT_STAT_ENABLE;
 480                 if (temp & PORT_OC)
 481                         status |= USB_PORT_STAT_OVERCURRENT;
 482                 if (temp & PORT_RESET)
 483                         status |= USB_PORT_STAT_RESET;
 484                 if (temp & PORT_POWER)
 485                         status |= USB_PORT_STAT_POWER;
 486                 if (bus_state->port_c_suspend & (1 << wIndex))
 487                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 488                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 489                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 490                 break;
 491         case SetPortFeature:
 492                 wIndex &= 0xff;
 493                 if (!wIndex || wIndex > ports)
 494                         goto error;
 495                 wIndex--;
 496                 temp = xhci_readl(xhci, port_array[wIndex]);
 497                 if (temp == 0xffffffff) {
 498                         retval = -ENODEV;
 499                         break;
 500                 }
 501                 temp = xhci_port_state_to_neutral(temp);
 502                 /* FIXME: What new port features do we need to support? */
 503                 switch (wValue) {
 504                 case USB_PORT_FEAT_SUSPEND:
 505                         temp = xhci_readl(xhci, port_array[wIndex]);
 506                         /* In spec software should not attempt to suspend
 507                          * a port unless the port reports that it is in the
 508                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 509                          */
 510                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 511                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 512                                 xhci_warn(xhci, "USB core suspending device "
 513                                           "not in U0/U1/U2.\n");
 514                                 goto error;
 515                         }
 516
 517                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 518                                         wIndex + 1);
 519                         if (!slot_id) {
 520                                 xhci_warn(xhci, "slot_id is zero\n");
 521                                 goto error;
 522                         }
 523                         /* unlock to execute stop endpoint commands */
 524                         spin_unlock_irqrestore(&xhci->lock, flags);
 525                         xhci_stop_device(xhci, slot_id, 1);
 526                         spin_lock_irqsave(&xhci->lock, flags);
 527
 528                         temp = xhci_port_state_to_neutral(temp);
 529                         temp &= ~PORT_PLS_MASK;
 530                         temp |= PORT_LINK_STROBE | XDEV_U3;
 531                         xhci_writel(xhci, temp, port_array[wIndex]);
 532
 533                         spin_unlock_irqrestore(&xhci->lock, flags);
 534                         msleep(10); /* wait device to enter */
 535                         spin_lock_irqsave(&xhci->lock, flags);
 536
 537                         temp = xhci_readl(xhci, port_array[wIndex]);
 538                         bus_state->suspended_ports |= 1 << wIndex;
 539                         break;
 540                 case USB_PORT_FEAT_POWER:
 541                         /*
 542                          * Turn on ports, even if there isn't per-port switching.
 543                          * HC will report connect events even before this is set.
 544                          * However, khubd will ignore the roothub events until
 545                          * the roothub is registered.
 546                          */
 547                         xhci_writel(xhci, temp | PORT_POWER,
 548                                         port_array[wIndex]);
 549
 550                         temp = xhci_readl(xhci, port_array[wIndex]);
 551                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 552                         break;
 553                 case USB_PORT_FEAT_RESET:
 554                         temp = (temp | PORT_RESET);
 555                         xhci_writel(xhci, temp, port_array[wIndex]);
 556
 557                         temp = xhci_readl(xhci, port_array[wIndex]);
 558                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
 559                         break;
 560                 default:
 561                         goto error;
 562                 }
 563                 /* unblock any posted writes */
 564                 temp = xhci_readl(xhci, port_array[wIndex]);
 565                 break;
 566         case ClearPortFeature:
 567                 if (!wIndex || wIndex > ports)
 568                         goto error;
 569                 wIndex--;
 570                 temp = xhci_readl(xhci, port_array[wIndex]);
 571                 if (temp == 0xffffffff) {
 572                         retval = -ENODEV;
 573                         break;
 574                 }
 575                 /* FIXME: What new port features do we need to support? */
 576                 temp = xhci_port_state_to_neutral(temp);
 577                 switch (wValue) {
 578                 case USB_PORT_FEAT_SUSPEND:
 579                         temp = xhci_readl(xhci, port_array[wIndex]);
 580                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
 581                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
 582                         if (temp & PORT_RESET)
 583                                 goto error;
 584                         if (temp & XDEV_U3) {
 585                                 if ((temp & PORT_PE) == 0)
 586                                         goto error;
 587                                 if (DEV_SUPERSPEED(temp)) {
 588                                         temp = xhci_port_state_to_neutral(temp);
 589                                         temp &= ~PORT_PLS_MASK;
 590                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 591                                         xhci_writel(xhci, temp,
 592                                                         port_array[wIndex]);
 593                                         xhci_readl(xhci, port_array[wIndex]);
 594                                 } else {
 595                                         temp = xhci_port_state_to_neutral(temp);
 596                                         temp &= ~PORT_PLS_MASK;
 597                                         temp |= PORT_LINK_STROBE | XDEV_RESUME;
 598                                         xhci_writel(xhci, temp,
 599                                                         port_array[wIndex]);
 600
 601                                         spin_unlock_irqrestore(&xhci->lock,
 602                                                                flags);
 603                                         msleep(20);
 604                                         spin_lock_irqsave(&xhci->lock, flags);
 605
 606                                         temp = xhci_readl(xhci,
 607                                                         port_array[wIndex]);
 608                                         temp = xhci_port_state_to_neutral(temp);
 609                                         temp &= ~PORT_PLS_MASK;
 610                                         temp |= PORT_LINK_STROBE | XDEV_U0;
 611                                         xhci_writel(xhci, temp,
 612                                                         port_array[wIndex]);
 613                                 }
 614                                 bus_state->port_c_suspend |= 1 << wIndex;
 615                         }
 616
 617                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 618                                         wIndex + 1);
 619                         if (!slot_id) {
 620                                 xhci_dbg(xhci, "slot_id is zero\n");
 621                                 goto error;
 622                         }
 623                         xhci_ring_device(xhci, slot_id);
 624                         break;
 625                 case USB_PORT_FEAT_C_SUSPEND:
 626                         bus_state->port_c_suspend &= ~(1 << wIndex);
 627                 case USB_PORT_FEAT_C_RESET:
 628                 case USB_PORT_FEAT_C_CONNECTION:
 629                 case USB_PORT_FEAT_C_OVER_CURRENT:
 630                 case USB_PORT_FEAT_C_ENABLE:
 631                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
 632                                         port_array[wIndex], temp);
 633                         break;
 634                 case USB_PORT_FEAT_ENABLE:
 635                         xhci_disable_port(hcd, xhci, wIndex,
 636                                         port_array[wIndex], temp);
 637                         break;
 638                 default:
 639                         goto error;
 640                 }
 641                 break;
 642         default:
 643 error:
 644                 /* "stall" on error */
 645                 retval = -EPIPE;
 646         }
 647         spin_unlock_irqrestore(&xhci->lock, flags);
 648         return retval;
 649 }
 650
 651 /*
 652  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 653  * Ports are 0-indexed from the HCD point of view,
 654  * and 1-indexed from the USB core pointer of view.
 655  *
 656  * Note that the status change bits will be cleared as soon as a port status
 657  * change event is generated, so we use the saved status from that event.
 658  */
 659 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 660 {
 661         unsigned long flags;
 662         u32 temp, status;
 663         u32 mask;
 664         int i, retval;
 665         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 666         int ports;
 667         u32 __iomem **port_array;
 668         struct xhci_bus_state *bus_state;
 669
 670         if (hcd->speed == HCD_USB3) {
 671                 ports = xhci->num_usb3_ports;
 672                 port_array = xhci->usb3_ports;
 673         } else {
 674                 ports = xhci->num_usb2_ports;
 675                 port_array = xhci->usb2_ports;
 676         }
 677         bus_state = &xhci->bus_state[hcd_index(hcd)];
 678
 679         /* Initial status is no changes */
 680         retval = (ports + 8) / 8;
 681         memset(buf, 0, retval);
 682         status = 0;
 683
 684         mask = PORT_CSC | PORT_PEC | PORT_OCC;
 685
 686         spin_lock_irqsave(&xhci->lock, flags);
 687         /* For each port, did anything change?  If so, set that bit in buf. */
 688         for (i = 0; i < ports; i++) {
 689                 temp = xhci_readl(xhci, port_array[i]);
 690                 if (temp == 0xffffffff) {
 691                         retval = -ENODEV;
 692                         break;
 693                 }
 694                 if ((temp & mask) != 0 ||
 695                         (bus_state->port_c_suspend & 1 << i) ||
 696                         (bus_state->resume_done[i] && time_after_eq(
 697                             jiffies, bus_state->resume_done[i]))) {
 698                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
 699                         status = 1;
 700                 }
 701         }
 702         spin_unlock_irqrestore(&xhci->lock, flags);
 703         return status ? retval : 0;
 704 }
 705
 706 #ifdef CONFIG_PM
 707
 708 int xhci_bus_suspend(struct usb_hcd *hcd)
 709 {
 710         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 711         int max_ports, port_index;
 712         u32 __iomem **port_array;
 713         struct xhci_bus_state *bus_state;
 714         unsigned long flags;
 715
 716         if (hcd->speed == HCD_USB3) {
 717                 max_ports = xhci->num_usb3_ports;
 718                 port_array = xhci->usb3_ports;
 719                 xhci_dbg(xhci, "suspend USB 3.0 root hub\n");
 720         } else {
 721                 max_ports = xhci->num_usb2_ports;
 722                 port_array = xhci->usb2_ports;
 723                 xhci_dbg(xhci, "suspend USB 2.0 root hub\n");
 724         }
 725         bus_state = &xhci->bus_state[hcd_index(hcd)];
 726
 727         spin_lock_irqsave(&xhci->lock, flags);
 728
 729         if (hcd->self.root_hub->do_remote_wakeup) {
 730                 port_index = max_ports;
 731                 while (port_index--) {
 732                         if (bus_state->resume_done[port_index] != 0) {
 733                                 spin_unlock_irqrestore(&xhci->lock, flags);
 734                                 xhci_dbg(xhci, "suspend failed because "
 735                                                 "port %d is resuming\n",
 736                                                 port_index + 1);
 737                                 return -EBUSY;
 738                         }
 739                 }
 740         }
 741
 742         port_index = max_ports;
 743         bus_state->bus_suspended = 0;
 744         while (port_index--) {
 745                 /* suspend the port if the port is not suspended */
 746                 u32 t1, t2;
 747                 int slot_id;
 748
 749                 t1 = xhci_readl(xhci, port_array[port_index]);
 750                 t2 = xhci_port_state_to_neutral(t1);
 751
 752                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
 753                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
 754                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 755                                         port_index + 1);
 756                         if (slot_id) {
 757                                 spin_unlock_irqrestore(&xhci->lock, flags);
 758                                 xhci_stop_device(xhci, slot_id, 1);
 759                                 spin_lock_irqsave(&xhci->lock, flags);
 760                         }
 761                         t2 &= ~PORT_PLS_MASK;
 762                         t2 |= PORT_LINK_STROBE | XDEV_U3;
 763                         set_bit(port_index, &bus_state->bus_suspended);
 764                 }
 765                 if (hcd->self.root_hub->do_remote_wakeup) {
 766                         if (t1 & PORT_CONNECT) {
 767                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 768                                 t2 &= ~PORT_WKCONN_E;
 769                         } else {
 770                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 771                                 t2 &= ~PORT_WKDISC_E;
 772                         }
 773                 } else
 774                         t2 &= ~PORT_WAKE_BITS;
 775
 776                 t1 = xhci_port_state_to_neutral(t1);
 777                 if (t1 != t2)
 778                         xhci_writel(xhci, t2, port_array[port_index]);
 779
 780                 if (DEV_HIGHSPEED(t1)) {
 781                         /* enable remote wake up for USB 2.0 */
 782                         u32 __iomem *addr;
 783                         u32 tmp;
 784
 785                         /* Add one to the port status register address to get
 786                          * the port power control register address.
 787                          */
 788                         addr = port_array[port_index] + 1;
 789                         tmp = xhci_readl(xhci, addr);
 790                         tmp |= PORT_RWE;
 791                         xhci_writel(xhci, tmp, addr);
 792                 }
 793         }
 794         hcd->state = HC_STATE_SUSPENDED;
 795         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
 796         spin_unlock_irqrestore(&xhci->lock, flags);
 797         return 0;
 798 }
 799
 800 int xhci_bus_resume(struct usb_hcd *hcd)
 801 {
 802         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 803         int max_ports, port_index;
 804         u32 __iomem **port_array;
 805         struct xhci_bus_state *bus_state;
 806         u32 temp;
 807         unsigned long flags;
 808
 809         if (hcd->speed == HCD_USB3) {
 810                 max_ports = xhci->num_usb3_ports;
 811                 port_array = xhci->usb3_ports;
 812                 xhci_dbg(xhci, "resume USB 3.0 root hub\n");
 813         } else {
 814                 max_ports = xhci->num_usb2_ports;
 815                 port_array = xhci->usb2_ports;
 816                 xhci_dbg(xhci, "resume USB 2.0 root hub\n");
 817         }
 818         bus_state = &xhci->bus_state[hcd_index(hcd)];
 819
 820         if (time_before(jiffies, bus_state->next_statechange))
 821                 msleep(5);
 822
 823         spin_lock_irqsave(&xhci->lock, flags);
 824         if (!HCD_HW_ACCESSIBLE(hcd)) {
 825                 spin_unlock_irqrestore(&xhci->lock, flags);
 826                 return -ESHUTDOWN;
 827         }
 828
 829         /* delay the irqs */
 830         temp = xhci_readl(xhci, &xhci->op_regs->command);
 831         temp &= ~CMD_EIE;
 832         xhci_writel(xhci, temp, &xhci->op_regs->command);
 833
 834         port_index = max_ports;
 835         while (port_index--) {
 836                 /* Check whether need resume ports. If needed
 837                    resume port and disable remote wakeup */
 838                 u32 temp;
 839                 int slot_id;
 840
 841                 temp = xhci_readl(xhci, port_array[port_index]);
 842                 if (DEV_SUPERSPEED(temp))
 843                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
 844                 else
 845                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 846                 if (test_bit(port_index, &bus_state->bus_suspended) &&
 847                     (temp & PORT_PLS_MASK)) {
 848                         if (DEV_SUPERSPEED(temp)) {
 849                                 temp = xhci_port_state_to_neutral(temp);
 850                                 temp &= ~PORT_PLS_MASK;
 851                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 852                                 xhci_writel(xhci, temp, port_array[port_index]);
 853                         } else {
 854                                 temp = xhci_port_state_to_neutral(temp);
 855                                 temp &= ~PORT_PLS_MASK;
 856                                 temp |= PORT_LINK_STROBE | XDEV_RESUME;
 857                                 xhci_writel(xhci, temp, port_array[port_index]);
 858
 859                                 spin_unlock_irqrestore(&xhci->lock, flags);
 860                                 msleep(20);
 861                                 spin_lock_irqsave(&xhci->lock, flags);
 862
 863                                 temp = xhci_readl(xhci, port_array[port_index]);
 864                                 temp = xhci_port_state_to_neutral(temp);
 865                                 temp &= ~PORT_PLS_MASK;
 866                                 temp |= PORT_LINK_STROBE | XDEV_U0;
 867                                 xhci_writel(xhci, temp, port_array[port_index]);
 868                         }
 869                         slot_id = xhci_find_slot_id_by_port(hcd,
 870                                         xhci, port_index + 1);
 871                         if (slot_id)
 872                                 xhci_ring_device(xhci, slot_id);
 873                 } else
 874                         xhci_writel(xhci, temp, port_array[port_index]);
 875
 876                 if (DEV_HIGHSPEED(temp)) {
 877                         /* disable remote wake up for USB 2.0 */
 878                         u32 __iomem *addr;
 879                         u32 tmp;
 880
 881                         /* Add one to the port status register address to get
 882                          * the port power control register address.
 883                          */
 884                         addr = port_array[port_index] + 1;
 885                         tmp = xhci_readl(xhci, addr);
 886                         tmp &= ~PORT_RWE;
 887                         xhci_writel(xhci, tmp, addr);
 888                 }
 889         }
 890
 891         (void) xhci_readl(xhci, &xhci->op_regs->command);
 892
 893         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
 894         /* re-enable irqs */
 895         temp = xhci_readl(xhci, &xhci->op_regs->command);
 896         temp |= CMD_EIE;
 897         xhci_writel(xhci, temp, &xhci->op_regs->command);
 898         temp = xhci_readl(xhci, &xhci->op_regs->command);
 899
 900         spin_unlock_irqrestore(&xhci->lock, flags);
 901         return 0;
 902 }
 903
 904 #endif  /* CONFIG_PM */