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
  24 #include <linux/slab.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "xhci.h"
  28 #include "xhci-trace.h"
  29
  30 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  31 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  32                          PORT_RC | PORT_PLC | PORT_PE)
  33
  34 /* USB 3 BOS descriptor and a capability descriptors, combined.
  35  * Fields will be adjusted and added later in xhci_create_usb3_bos_desc()
  36  */
  37 static u8 usb_bos_descriptor [] = {
  38         USB_DT_BOS_SIZE,                /*  __u8 bLength, 5 bytes */
  39         USB_DT_BOS,                     /*  __u8 bDescriptorType */
  40         0x0F, 0x00,                     /*  __le16 wTotalLength, 15 bytes */
  41         0x1,                            /*  __u8 bNumDeviceCaps */
  42         /* First device capability, SuperSpeed */
  43         USB_DT_USB_SS_CAP_SIZE,         /*  __u8 bLength, 10 bytes */
  44         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
  45         USB_SS_CAP_TYPE,                /* bDevCapabilityType, SUPERSPEED_USB */
  46         0x00,                           /* bmAttributes, LTM off by default */
  47         USB_5GBPS_OPERATION, 0x00,      /* wSpeedsSupported, 5Gbps only */
  48         0x03,                           /* bFunctionalitySupport,
  49                                            USB 3.0 speed only */
  50         0x00,                           /* bU1DevExitLat, set later. */
  51         0x00, 0x00,                     /* __le16 bU2DevExitLat, set later. */
  52         /* Second device capability, SuperSpeedPlus */
  53         0x0c,                           /* bLength 12, will be adjusted later */
  54         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
  55         USB_SSP_CAP_TYPE,               /* bDevCapabilityType SUPERSPEED_PLUS */
  56         0x00,                           /* bReserved 0 */
  57         0x00, 0x00, 0x00, 0x00,         /* bmAttributes, get from xhci psic */
  58         0x00, 0x00,                     /* wFunctionalitySupport */
  59         0x00, 0x00,                     /* wReserved 0 */
  60         /* Sublink Speed Attributes are added in xhci_create_usb3_bos_desc() */
  61 };
  62
  63 static int xhci_create_usb3_bos_desc(struct xhci_hcd *xhci, char *buf,
  64                                      u16 wLength)
  65 {
  66         int i, ssa_count;
  67         u32 temp;
  68         u16 desc_size, ssp_cap_size, ssa_size = 0;
  69         bool usb3_1 = false;
  70
  71         desc_size = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
  72         ssp_cap_size = sizeof(usb_bos_descriptor) - desc_size;
  73
  74         /* does xhci support USB 3.1 Enhanced SuperSpeed */
  75         if (xhci->usb3_rhub.min_rev >= 0x01 && xhci->usb3_rhub.psi_uid_count) {
  76                 /* two SSA entries for each unique PSI ID, one RX and one TX */
  77                 ssa_count = xhci->usb3_rhub.psi_uid_count * 2;
  78                 ssa_size = ssa_count * sizeof(u32);
  79                 desc_size += ssp_cap_size;
  80                 usb3_1 = true;
  81         }
  82         memcpy(buf, &usb_bos_descriptor, min(desc_size, wLength));
  83
  84         if (usb3_1) {
  85                 /* modify bos descriptor bNumDeviceCaps and wTotalLength */
  86                 buf[4] += 1;
  87                 put_unaligned_le16(desc_size + ssa_size, &buf[2]);
  88         }
  89
  90         if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
  91                 return wLength;
  92
  93         /* Indicate whether the host has LTM support. */
  94         temp = readl(&xhci->cap_regs->hcc_params);
  95         if (HCC_LTC(temp))
  96                 buf[8] |= USB_LTM_SUPPORT;
  97
  98         /* Set the U1 and U2 exit latencies. */
  99         if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
 100                 temp = readl(&xhci->cap_regs->hcs_params3);
 101                 buf[12] = HCS_U1_LATENCY(temp);
 102                 put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]);
 103         }
 104
 105         if (usb3_1) {
 106                 u32 ssp_cap_base, bm_attrib, psi;
 107                 int offset;
 108
 109                 ssp_cap_base = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
 110
 111                 if (wLength < desc_size)
 112                         return wLength;
 113                 buf[ssp_cap_base] = ssp_cap_size + ssa_size;
 114
 115                 /* attribute count SSAC bits 4:0 and ID count SSIC bits 8:5 */
 116                 bm_attrib = (ssa_count - 1) & 0x1f;
 117                 bm_attrib |= (xhci->usb3_rhub.psi_uid_count - 1) << 5;
 118                 put_unaligned_le32(bm_attrib, &buf[ssp_cap_base + 4]);
 119
 120                 if (wLength < desc_size + ssa_size)
 121                         return wLength;
 122                 /*
 123                  * Create the Sublink Speed Attributes (SSA) array.
 124                  * The xhci PSI field and USB 3.1 SSA fields are very similar,
 125                  * but link type bits 7:6 differ for values 01b and 10b.
 126                  * xhci has also only one PSI entry for a symmetric link when
 127                  * USB 3.1 requires two SSA entries (RX and TX) for every link
 128                  */
 129                 offset = desc_size;
 130                 for (i = 0; i < xhci->usb3_rhub.psi_count; i++) {
 131                         psi = xhci->usb3_rhub.psi[i];
 132                         psi &= ~USB_SSP_SUBLINK_SPEED_RSVD;
 133                         if ((psi & PLT_MASK) == PLT_SYM) {
 134                         /* Symmetric, create SSA RX and TX from one PSI entry */
 135                                 put_unaligned_le32(psi, &buf[offset]);
 136                                 psi |= 1 << 7;  /* turn entry to TX */
 137                                 offset += 4;
 138                                 if (offset >= desc_size + ssa_size)
 139                                         return desc_size + ssa_size;
 140                         } else if ((psi & PLT_MASK) == PLT_ASYM_RX) {
 141                                 /* Asymetric RX, flip bits 7:6 for SSA */
 142                                 psi ^= PLT_MASK;
 143                         }
 144                         put_unaligned_le32(psi, &buf[offset]);
 145                         offset += 4;
 146                         if (offset >= desc_size + ssa_size)
 147                                 return desc_size + ssa_size;
 148                 }
 149         }
 150         /* ssa_size is 0 for other than usb 3.1 hosts */
 151         return desc_size + ssa_size;
 152 }
 153
 154 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 155                 struct usb_hub_descriptor *desc, int ports)
 156 {
 157         u16 temp;
 158
 159         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
 160         desc->bHubContrCurrent = 0;
 161
 162         desc->bNbrPorts = ports;
 163         temp = 0;
 164         /* Bits 1:0 - support per-port power switching, or power always on */
 165         if (HCC_PPC(xhci->hcc_params))
 166                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 167         else
 168                 temp |= HUB_CHAR_NO_LPSM;
 169         /* Bit  2 - root hubs are not part of a compound device */
 170         /* Bits 4:3 - individual port over current protection */
 171         temp |= HUB_CHAR_INDV_PORT_OCPM;
 172         /* Bits 6:5 - no TTs in root ports */
 173         /* Bit  7 - no port indicators */
 174         desc->wHubCharacteristics = cpu_to_le16(temp);
 175 }
 176
 177 /* Fill in the USB 2.0 roothub descriptor */
 178 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 179                 struct usb_hub_descriptor *desc)
 180 {
 181         int ports;
 182         u16 temp;
 183         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
 184         u32 portsc;
 185         unsigned int i;
 186
 187         ports = xhci->num_usb2_ports;
 188
 189         xhci_common_hub_descriptor(xhci, desc, ports);
 190         desc->bDescriptorType = USB_DT_HUB;
 191         temp = 1 + (ports / 8);
 192         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
 193
 194         /* The Device Removable bits are reported on a byte granularity.
 195          * If the port doesn't exist within that byte, the bit is set to 0.
 196          */
 197         memset(port_removable, 0, sizeof(port_removable));
 198         for (i = 0; i < ports; i++) {
 199                 portsc = readl(xhci->usb2_ports[i]);
 200                 /* If a device is removable, PORTSC reports a 0, same as in the
 201                  * hub descriptor DeviceRemovable bits.
 202                  */
 203                 if (portsc & PORT_DEV_REMOVE)
 204                         /* This math is hairy because bit 0 of DeviceRemovable
 205                          * is reserved, and bit 1 is for port 1, etc.
 206                          */
 207                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
 208         }
 209
 210         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
 211          * ports on it.  The USB 2.0 specification says that there are two
 212          * variable length fields at the end of the hub descriptor:
 213          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
 214          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
 215          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
 216          * 0xFF, so we initialize the both arrays (DeviceRemovable and
 217          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
 218          * set of ports that actually exist.
 219          */
 220         memset(desc->u.hs.DeviceRemovable, 0xff,
 221                         sizeof(desc->u.hs.DeviceRemovable));
 222         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 223                         sizeof(desc->u.hs.PortPwrCtrlMask));
 224
 225         for (i = 0; i < (ports + 1 + 7) / 8; i++)
 226                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 227                                 sizeof(__u8));
 228 }
 229
 230 /* Fill in the USB 3.0 roothub descriptor */
 231 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 232                 struct usb_hub_descriptor *desc)
 233 {
 234         int ports;
 235         u16 port_removable;
 236         u32 portsc;
 237         unsigned int i;
 238
 239         ports = xhci->num_usb3_ports;
 240         xhci_common_hub_descriptor(xhci, desc, ports);
 241         desc->bDescriptorType = USB_DT_SS_HUB;
 242         desc->bDescLength = USB_DT_SS_HUB_SIZE;
 243
 244         /* header decode latency should be zero for roothubs,
 245          * see section 4.23.5.2.
 246          */
 247         desc->u.ss.bHubHdrDecLat = 0;
 248         desc->u.ss.wHubDelay = 0;
 249
 250         port_removable = 0;
 251         /* bit 0 is reserved, bit 1 is for port 1, etc. */
 252         for (i = 0; i < ports; i++) {
 253                 portsc = readl(xhci->usb3_ports[i]);
 254                 if (portsc & PORT_DEV_REMOVE)
 255                         port_removable |= 1 << (i + 1);
 256         }
 257
 258         desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
 259 }
 260
 261 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 262                 struct usb_hub_descriptor *desc)
 263 {
 264
 265         if (hcd->speed == HCD_USB3)
 266                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
 267         else
 268                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
 269
 270 }
 271
 272 static unsigned int xhci_port_speed(unsigned int port_status)
 273 {
 274         if (DEV_LOWSPEED(port_status))
 275                 return USB_PORT_STAT_LOW_SPEED;
 276         if (DEV_HIGHSPEED(port_status))
 277                 return USB_PORT_STAT_HIGH_SPEED;
 278         /*
 279          * FIXME: Yes, we should check for full speed, but the core uses that as
 280          * a default in portspeed() in usb/core/hub.c (which is the only place
 281          * USB_PORT_STAT_*_SPEED is used).
 282          */
 283         return 0;
 284 }
 285
 286 /*
 287  * These bits are Read Only (RO) and should be saved and written to the
 288  * registers: 0, 3, 10:13, 30
 289  * connect status, over-current status, port speed, and device removable.
 290  * connect status and port speed are also sticky - meaning they're in
 291  * the AUX well and they aren't changed by a hot, warm, or cold reset.
 292  */
 293 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 294 /*
 295  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 296  * bits 5:8, 9, 14:15, 25:27
 297  * link state, port power, port indicator state, "wake on" enable state
 298  */
 299 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 300 /*
 301  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 302  * bit 4 (port reset)
 303  */
 304 #define XHCI_PORT_RW1S  ((1<<4))
 305 /*
 306  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 307  * bits 1, 17, 18, 19, 20, 21, 22, 23
 308  * port enable/disable, and
 309  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 310  * over-current, reset, link state, and L1 change
 311  */
 312 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 313 /*
 314  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 315  * latched in
 316  */
 317 #define XHCI_PORT_RW    ((1<<16))
 318 /*
 319  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 320  * bits 2, 24, 28:31
 321  */
 322 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 323
 324 /*
 325  * Given a port state, this function returns a value that would result in the
 326  * port being in the same state, if the value was written to the port status
 327  * control register.
 328  * Save Read Only (RO) bits and save read/write bits where
 329  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 330  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 331  */
 332 u32 xhci_port_state_to_neutral(u32 state)
 333 {
 334         /* Save read-only status and port state */
 335         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 336 }
 337
 338 /*
 339  * find slot id based on port number.
 340  * @port: The one-based port number from one of the two split roothubs.
 341  */
 342 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 343                 u16 port)
 344 {
 345         int slot_id;
 346         int i;
 347         enum usb_device_speed speed;
 348
 349         slot_id = 0;
 350         for (i = 0; i < MAX_HC_SLOTS; i++) {
 351                 if (!xhci->devs[i])
 352                         continue;
 353                 speed = xhci->devs[i]->udev->speed;
 354                 if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3))
 355                                 && xhci->devs[i]->fake_port == port) {
 356                         slot_id = i;
 357                         break;
 358                 }
 359         }
 360
 361         return slot_id;
 362 }
 363
 364 /*
 365  * Stop device
 366  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 367  * to complete.
 368  * suspend will set to 1, if suspend bit need to set in command.
 369  */
 370 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 371 {
 372         struct xhci_virt_device *virt_dev;
 373         struct xhci_command *cmd;
 374         unsigned long flags;
 375         int ret;
 376         int i;
 377
 378         ret = 0;
 379         virt_dev = xhci->devs[slot_id];
 380         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
 381         if (!cmd) {
 382                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
 383                 return -ENOMEM;
 384         }
 385
 386         spin_lock_irqsave(&xhci->lock, flags);
 387         for (i = LAST_EP_INDEX; i > 0; i--) {
 388                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 389                         struct xhci_command *command;
 390                         command = xhci_alloc_command(xhci, false, false,
 391                                                      GFP_NOWAIT);
 392                         if (!command) {
 393                                 spin_unlock_irqrestore(&xhci->lock, flags);
 394                                 xhci_free_command(xhci, cmd);
 395                                 return -ENOMEM;
 396
 397                         }
 398                         xhci_queue_stop_endpoint(xhci, command, slot_id, i,
 399                                                  suspend);
 400                 }
 401         }
 402         xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 403         xhci_ring_cmd_db(xhci);
 404         spin_unlock_irqrestore(&xhci->lock, flags);
 405
 406         /* Wait for last stop endpoint command to finish */
 407         wait_for_completion(cmd->completion);
 408
 409         if (cmd->status == COMP_CMD_ABORT || cmd->status == COMP_CMD_STOP) {
 410                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 411                 ret = -ETIME;
 412         }
 413         xhci_free_command(xhci, cmd);
 414         return ret;
 415 }
 416
 417 /*
 418  * Ring device, it rings the all doorbells unconditionally.
 419  */
 420 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 421 {
 422         int i, s;
 423         struct xhci_virt_ep *ep;
 424
 425         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 426                 ep = &xhci->devs[slot_id]->eps[i];
 427
 428                 if (ep->ep_state & EP_HAS_STREAMS) {
 429                         for (s = 1; s < ep->stream_info->num_streams; s++)
 430                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 431                 } else if (ep->ring && ep->ring->dequeue) {
 432                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 433                 }
 434         }
 435
 436         return;
 437 }
 438
 439 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 440                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 441 {
 442         /* Don't allow the USB core to disable SuperSpeed ports. */
 443         if (hcd->speed == HCD_USB3) {
 444                 xhci_dbg(xhci, "Ignoring request to disable "
 445                                 "SuperSpeed port.\n");
 446                 return;
 447         }
 448
 449         /* Write 1 to disable the port */
 450         writel(port_status | PORT_PE, addr);
 451         port_status = readl(addr);
 452         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
 453                         wIndex, port_status);
 454 }
 455
 456 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 457                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 458 {
 459         char *port_change_bit;
 460         u32 status;
 461
 462         switch (wValue) {
 463         case USB_PORT_FEAT_C_RESET:
 464                 status = PORT_RC;
 465                 port_change_bit = "reset";
 466                 break;
 467         case USB_PORT_FEAT_C_BH_PORT_RESET:
 468                 status = PORT_WRC;
 469                 port_change_bit = "warm(BH) reset";
 470                 break;
 471         case USB_PORT_FEAT_C_CONNECTION:
 472                 status = PORT_CSC;
 473                 port_change_bit = "connect";
 474                 break;
 475         case USB_PORT_FEAT_C_OVER_CURRENT:
 476                 status = PORT_OCC;
 477                 port_change_bit = "over-current";
 478                 break;
 479         case USB_PORT_FEAT_C_ENABLE:
 480                 status = PORT_PEC;
 481                 port_change_bit = "enable/disable";
 482                 break;
 483         case USB_PORT_FEAT_C_SUSPEND:
 484                 status = PORT_PLC;
 485                 port_change_bit = "suspend/resume";
 486                 break;
 487         case USB_PORT_FEAT_C_PORT_LINK_STATE:
 488                 status = PORT_PLC;
 489                 port_change_bit = "link state";
 490                 break;
 491         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 492                 status = PORT_CEC;
 493                 port_change_bit = "config error";
 494                 break;
 495         default:
 496                 /* Should never happen */
 497                 return;
 498         }
 499         /* Change bits are all write 1 to clear */
 500         writel(port_status | status, addr);
 501         port_status = readl(addr);
 502         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
 503                         port_change_bit, wIndex, port_status);
 504 }
 505
 506 static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
 507 {
 508         int max_ports;
 509         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 510
 511         if (hcd->speed == HCD_USB3) {
 512                 max_ports = xhci->num_usb3_ports;
 513                 *port_array = xhci->usb3_ports;
 514         } else {
 515                 max_ports = xhci->num_usb2_ports;
 516                 *port_array = xhci->usb2_ports;
 517         }
 518
 519         return max_ports;
 520 }
 521
 522 void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
 523                                 int port_id, u32 link_state)
 524 {
 525         u32 temp;
 526
 527         temp = readl(port_array[port_id]);
 528         temp = xhci_port_state_to_neutral(temp);
 529         temp &= ~PORT_PLS_MASK;
 530         temp |= PORT_LINK_STROBE | link_state;
 531         writel(temp, port_array[port_id]);
 532 }
 533
 534 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 535                 __le32 __iomem **port_array, int port_id, u16 wake_mask)
 536 {
 537         u32 temp;
 538
 539         temp = readl(port_array[port_id]);
 540         temp = xhci_port_state_to_neutral(temp);
 541
 542         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 543                 temp |= PORT_WKCONN_E;
 544         else
 545                 temp &= ~PORT_WKCONN_E;
 546
 547         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 548                 temp |= PORT_WKDISC_E;
 549         else
 550                 temp &= ~PORT_WKDISC_E;
 551
 552         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 553                 temp |= PORT_WKOC_E;
 554         else
 555                 temp &= ~PORT_WKOC_E;
 556
 557         writel(temp, port_array[port_id]);
 558 }
 559
 560 /* Test and clear port RWC bit */
 561 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
 562                                 int port_id, u32 port_bit)
 563 {
 564         u32 temp;
 565
 566         temp = readl(port_array[port_id]);
 567         if (temp & port_bit) {
 568                 temp = xhci_port_state_to_neutral(temp);
 569                 temp |= port_bit;
 570                 writel(temp, port_array[port_id]);
 571         }
 572 }
 573
 574 /* Updates Link Status for USB 2.1 port */
 575 static void xhci_hub_report_usb2_link_state(u32 *status, u32 status_reg)
 576 {
 577         if ((status_reg & PORT_PLS_MASK) == XDEV_U2)
 578                 *status |= USB_PORT_STAT_L1;
 579 }
 580
 581 /* Updates Link Status for super Speed port */
 582 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 583                 u32 *status, u32 status_reg)
 584 {
 585         u32 pls = status_reg & PORT_PLS_MASK;
 586
 587         /* resume state is a xHCI internal state.
 588          * Do not report it to usb core, instead, pretend to be U3,
 589          * thus usb core knows it's not ready for transfer
 590          */
 591         if (pls == XDEV_RESUME) {
 592                 *status |= USB_SS_PORT_LS_U3;
 593                 return;
 594         }
 595
 596         /* When the CAS bit is set then warm reset
 597          * should be performed on port
 598          */
 599         if (status_reg & PORT_CAS) {
 600                 /* The CAS bit can be set while the port is
 601                  * in any link state.
 602                  * Only roothubs have CAS bit, so we
 603                  * pretend to be in compliance mode
 604                  * unless we're already in compliance
 605                  * or the inactive state.
 606                  */
 607                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
 608                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
 609                         pls = USB_SS_PORT_LS_COMP_MOD;
 610                 }
 611                 /* Return also connection bit -
 612                  * hub state machine resets port
 613                  * when this bit is set.
 614                  */
 615                 pls |= USB_PORT_STAT_CONNECTION;
 616         } else {
 617                 /*
 618                  * If CAS bit isn't set but the Port is already at
 619                  * Compliance Mode, fake a connection so the USB core
 620                  * notices the Compliance state and resets the port.
 621                  * This resolves an issue generated by the SN65LVPE502CP
 622                  * in which sometimes the port enters compliance mode
 623                  * caused by a delay on the host-device negotiation.
 624                  */
 625                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 626                                 (pls == USB_SS_PORT_LS_COMP_MOD))
 627                         pls |= USB_PORT_STAT_CONNECTION;
 628         }
 629
 630         /* update status field */
 631         *status |= pls;
 632 }
 633
 634 /*
 635  * Function for Compliance Mode Quirk.
 636  *
 637  * This Function verifies if all xhc USB3 ports have entered U0, if so,
 638  * the compliance mode timer is deleted. A port won't enter
 639  * compliance mode if it has previously entered U0.
 640  */
 641 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 642                                     u16 wIndex)
 643 {
 644         u32 all_ports_seen_u0 = ((1 << xhci->num_usb3_ports)-1);
 645         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 646
 647         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 648                 return;
 649
 650         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 651                 xhci->port_status_u0 |= 1 << wIndex;
 652                 if (xhci->port_status_u0 == all_ports_seen_u0) {
 653                         del_timer_sync(&xhci->comp_mode_recovery_timer);
 654                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 655                                 "All USB3 ports have entered U0 already!");
 656                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 657                                 "Compliance Mode Recovery Timer Deleted.");
 658                 }
 659         }
 660 }
 661
 662 /*
 663  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
 664  * 3.0 hubs use.
 665  *
 666  * Possible side effects:
 667  *  - Mark a port as being done with device resume,
 668  *    and ring the endpoint doorbells.
 669  *  - Stop the Synopsys redriver Compliance Mode polling.
 670  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
 671  */
 672 static u32 xhci_get_port_status(struct usb_hcd *hcd,
 673                 struct xhci_bus_state *bus_state,
 674                 __le32 __iomem **port_array,
 675                 u16 wIndex, u32 raw_port_status,
 676                 unsigned long flags)
 677         __releases(&xhci->lock)
 678         __acquires(&xhci->lock)
 679 {
 680         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 681         u32 status = 0;
 682         int slot_id;
 683
 684         /* wPortChange bits */
 685         if (raw_port_status & PORT_CSC)
 686                 status |= USB_PORT_STAT_C_CONNECTION << 16;
 687         if (raw_port_status & PORT_PEC)
 688                 status |= USB_PORT_STAT_C_ENABLE << 16;
 689         if ((raw_port_status & PORT_OCC))
 690                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 691         if ((raw_port_status & PORT_RC))
 692                 status |= USB_PORT_STAT_C_RESET << 16;
 693         /* USB3.0 only */
 694         if (hcd->speed == HCD_USB3) {
 695                 /* Port link change with port in resume state should not be
 696                  * reported to usbcore, as this is an internal state to be
 697                  * handled by xhci driver. Reporting PLC to usbcore may
 698                  * cause usbcore clearing PLC first and port change event
 699                  * irq won't be generated.
 700                  */
 701                 if ((raw_port_status & PORT_PLC) &&
 702                         (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME)
 703                         status |= USB_PORT_STAT_C_LINK_STATE << 16;
 704                 if ((raw_port_status & PORT_WRC))
 705                         status |= USB_PORT_STAT_C_BH_RESET << 16;
 706                 if ((raw_port_status & PORT_CEC))
 707                         status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
 708         }
 709
 710         if (hcd->speed != HCD_USB3) {
 711                 if ((raw_port_status & PORT_PLS_MASK) == XDEV_U3
 712                                 && (raw_port_status & PORT_POWER))
 713                         status |= USB_PORT_STAT_SUSPEND;
 714         }
 715         if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
 716                         !DEV_SUPERSPEED(raw_port_status)) {
 717                 if ((raw_port_status & PORT_RESET) ||
 718                                 !(raw_port_status & PORT_PE))
 719                         return 0xffffffff;
 720                 if (time_after_eq(jiffies,
 721                                         bus_state->resume_done[wIndex])) {
 722                         int time_left;
 723
 724                         xhci_dbg(xhci, "Resume USB2 port %d\n",
 725                                         wIndex + 1);
 726                         bus_state->resume_done[wIndex] = 0;
 727                         clear_bit(wIndex, &bus_state->resuming_ports);
 728
 729                         set_bit(wIndex, &bus_state->rexit_ports);
 730                         xhci_set_link_state(xhci, port_array, wIndex,
 731                                         XDEV_U0);
 732
 733                         spin_unlock_irqrestore(&xhci->lock, flags);
 734                         time_left = wait_for_completion_timeout(
 735                                         &bus_state->rexit_done[wIndex],
 736                                         msecs_to_jiffies(
 737                                                 XHCI_MAX_REXIT_TIMEOUT));
 738                         spin_lock_irqsave(&xhci->lock, flags);
 739
 740                         if (time_left) {
 741                                 slot_id = xhci_find_slot_id_by_port(hcd,
 742                                                 xhci, wIndex + 1);
 743                                 if (!slot_id) {
 744                                         xhci_dbg(xhci, "slot_id is zero\n");
 745                                         return 0xffffffff;
 746                                 }
 747                                 xhci_ring_device(xhci, slot_id);
 748                         } else {
 749                                 int port_status = readl(port_array[wIndex]);
 750                                 xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n",
 751                                                 XHCI_MAX_REXIT_TIMEOUT,
 752                                                 port_status);
 753                                 status |= USB_PORT_STAT_SUSPEND;
 754                                 clear_bit(wIndex, &bus_state->rexit_ports);
 755                         }
 756
 757                         bus_state->port_c_suspend |= 1 << wIndex;
 758                         bus_state->suspended_ports &= ~(1 << wIndex);
 759                 } else {
 760                         /*
 761                          * The resume has been signaling for less than
 762                          * 20ms. Report the port status as SUSPEND,
 763                          * let the usbcore check port status again
 764                          * and clear resume signaling later.
 765                          */
 766                         status |= USB_PORT_STAT_SUSPEND;
 767                 }
 768         }
 769         if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0
 770                         && (raw_port_status & PORT_POWER)
 771                         && (bus_state->suspended_ports & (1 << wIndex))) {
 772                 bus_state->suspended_ports &= ~(1 << wIndex);
 773                 if (hcd->speed != HCD_USB3)
 774                         bus_state->port_c_suspend |= 1 << wIndex;
 775         }
 776         if (raw_port_status & PORT_CONNECT) {
 777                 status |= USB_PORT_STAT_CONNECTION;
 778                 status |= xhci_port_speed(raw_port_status);
 779         }
 780         if (raw_port_status & PORT_PE)
 781                 status |= USB_PORT_STAT_ENABLE;
 782         if (raw_port_status & PORT_OC)
 783                 status |= USB_PORT_STAT_OVERCURRENT;
 784         if (raw_port_status & PORT_RESET)
 785                 status |= USB_PORT_STAT_RESET;
 786         if (raw_port_status & PORT_POWER) {
 787                 if (hcd->speed == HCD_USB3)
 788                         status |= USB_SS_PORT_STAT_POWER;
 789                 else
 790                         status |= USB_PORT_STAT_POWER;
 791         }
 792         /* Update Port Link State */
 793         if (hcd->speed == HCD_USB3) {
 794                 xhci_hub_report_usb3_link_state(xhci, &status, raw_port_status);
 795                 /*
 796                  * Verify if all USB3 Ports Have entered U0 already.
 797                  * Delete Compliance Mode Timer if so.
 798                  */
 799                 xhci_del_comp_mod_timer(xhci, raw_port_status, wIndex);
 800         } else {
 801                 xhci_hub_report_usb2_link_state(&status, raw_port_status);
 802         }
 803         if (bus_state->port_c_suspend & (1 << wIndex))
 804                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 805
 806         return status;
 807 }
 808
 809 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 810                 u16 wIndex, char *buf, u16 wLength)
 811 {
 812         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 813         int max_ports;
 814         unsigned long flags;
 815         u32 temp, status;
 816         int retval = 0;
 817         __le32 __iomem **port_array;
 818         int slot_id;
 819         struct xhci_bus_state *bus_state;
 820         u16 link_state = 0;
 821         u16 wake_mask = 0;
 822         u16 timeout = 0;
 823
 824         max_ports = xhci_get_ports(hcd, &port_array);
 825         bus_state = &xhci->bus_state[hcd_index(hcd)];
 826
 827         spin_lock_irqsave(&xhci->lock, flags);
 828         switch (typeReq) {
 829         case GetHubStatus:
 830                 /* No power source, over-current reported per port */
 831                 memset(buf, 0, 4);
 832                 break;
 833         case GetHubDescriptor:
 834                 /* Check to make sure userspace is asking for the USB 3.0 hub
 835                  * descriptor for the USB 3.0 roothub.  If not, we stall the
 836                  * endpoint, like external hubs do.
 837                  */
 838                 if (hcd->speed == HCD_USB3 &&
 839                                 (wLength < USB_DT_SS_HUB_SIZE ||
 840                                  wValue != (USB_DT_SS_HUB << 8))) {
 841                         xhci_dbg(xhci, "Wrong hub descriptor type for "
 842                                         "USB 3.0 roothub.\n");
 843                         goto error;
 844                 }
 845                 xhci_hub_descriptor(hcd, xhci,
 846                                 (struct usb_hub_descriptor *) buf);
 847                 break;
 848         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 849                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
 850                         goto error;
 851
 852                 if (hcd->speed < HCD_USB3)
 853                         goto error;
 854
 855                 retval = xhci_create_usb3_bos_desc(xhci, buf, wLength);
 856                 spin_unlock_irqrestore(&xhci->lock, flags);
 857                 return retval;
 858         case GetPortStatus:
 859                 if (!wIndex || wIndex > max_ports)
 860                         goto error;
 861                 wIndex--;
 862                 temp = readl(port_array[wIndex]);
 863                 if (temp == 0xffffffff) {
 864                         retval = -ENODEV;
 865                         break;
 866                 }
 867                 status = xhci_get_port_status(hcd, bus_state, port_array,
 868                                 wIndex, temp, flags);
 869                 if (status == 0xffffffff)
 870                         goto error;
 871
 872                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n",
 873                                 wIndex, temp);
 874                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 875
 876                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 877                 break;
 878         case SetPortFeature:
 879                 if (wValue == USB_PORT_FEAT_LINK_STATE)
 880                         link_state = (wIndex & 0xff00) >> 3;
 881                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
 882                         wake_mask = wIndex & 0xff00;
 883                 /* The MSB of wIndex is the U1/U2 timeout */
 884                 timeout = (wIndex & 0xff00) >> 8;
 885                 wIndex &= 0xff;
 886                 if (!wIndex || wIndex > max_ports)
 887                         goto error;
 888                 wIndex--;
 889                 temp = readl(port_array[wIndex]);
 890                 if (temp == 0xffffffff) {
 891                         retval = -ENODEV;
 892                         break;
 893                 }
 894                 temp = xhci_port_state_to_neutral(temp);
 895                 /* FIXME: What new port features do we need to support? */
 896                 switch (wValue) {
 897                 case USB_PORT_FEAT_SUSPEND:
 898                         temp = readl(port_array[wIndex]);
 899                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
 900                                 /* Resume the port to U0 first */
 901                                 xhci_set_link_state(xhci, port_array, wIndex,
 902                                                         XDEV_U0);
 903                                 spin_unlock_irqrestore(&xhci->lock, flags);
 904                                 msleep(10);
 905                                 spin_lock_irqsave(&xhci->lock, flags);
 906                         }
 907                         /* In spec software should not attempt to suspend
 908                          * a port unless the port reports that it is in the
 909                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 910                          */
 911                         temp = readl(port_array[wIndex]);
 912                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 913                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 914                                 xhci_warn(xhci, "USB core suspending device "
 915                                           "not in U0/U1/U2.\n");
 916                                 goto error;
 917                         }
 918
 919                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 920                                         wIndex + 1);
 921                         if (!slot_id) {
 922                                 xhci_warn(xhci, "slot_id is zero\n");
 923                                 goto error;
 924                         }
 925                         /* unlock to execute stop endpoint commands */
 926                         spin_unlock_irqrestore(&xhci->lock, flags);
 927                         xhci_stop_device(xhci, slot_id, 1);
 928                         spin_lock_irqsave(&xhci->lock, flags);
 929
 930                         xhci_set_link_state(xhci, port_array, wIndex, XDEV_U3);
 931
 932                         spin_unlock_irqrestore(&xhci->lock, flags);
 933                         msleep(10); /* wait device to enter */
 934                         spin_lock_irqsave(&xhci->lock, flags);
 935
 936                         temp = readl(port_array[wIndex]);
 937                         bus_state->suspended_ports |= 1 << wIndex;
 938                         break;
 939                 case USB_PORT_FEAT_LINK_STATE:
 940                         temp = readl(port_array[wIndex]);
 941
 942                         /* Disable port */
 943                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
 944                                 xhci_dbg(xhci, "Disable port %d\n", wIndex);
 945                                 temp = xhci_port_state_to_neutral(temp);
 946                                 /*
 947                                  * Clear all change bits, so that we get a new
 948                                  * connection event.
 949                                  */
 950                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
 951                                         PORT_OCC | PORT_RC | PORT_PLC |
 952                                         PORT_CEC;
 953                                 writel(temp | PORT_PE, port_array[wIndex]);
 954                                 temp = readl(port_array[wIndex]);
 955                                 break;
 956                         }
 957
 958                         /* Put link in RxDetect (enable port) */
 959                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
 960                                 xhci_dbg(xhci, "Enable port %d\n", wIndex);
 961                                 xhci_set_link_state(xhci, port_array, wIndex,
 962                                                 link_state);
 963                                 temp = readl(port_array[wIndex]);
 964                                 break;
 965                         }
 966
 967                         /* Software should not attempt to set
 968                          * port link state above '3' (U3) and the port
 969                          * must be enabled.
 970                          */
 971                         if ((temp & PORT_PE) == 0 ||
 972                                 (link_state > USB_SS_PORT_LS_U3)) {
 973                                 xhci_warn(xhci, "Cannot set link state.\n");
 974                                 goto error;
 975                         }
 976
 977                         if (link_state == USB_SS_PORT_LS_U3) {
 978                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 979                                                 wIndex + 1);
 980                                 if (slot_id) {
 981                                         /* unlock to execute stop endpoint
 982                                          * commands */
 983                                         spin_unlock_irqrestore(&xhci->lock,
 984                                                                 flags);
 985                                         xhci_stop_device(xhci, slot_id, 1);
 986                                         spin_lock_irqsave(&xhci->lock, flags);
 987                                 }
 988                         }
 989
 990                         xhci_set_link_state(xhci, port_array, wIndex,
 991                                                 link_state);
 992
 993                         spin_unlock_irqrestore(&xhci->lock, flags);
 994                         msleep(20); /* wait device to enter */
 995                         spin_lock_irqsave(&xhci->lock, flags);
 996
 997                         temp = readl(port_array[wIndex]);
 998                         if (link_state == USB_SS_PORT_LS_U3)
 999                                 bus_state->suspended_ports |= 1 << wIndex;
1000                         break;
1001                 case USB_PORT_FEAT_POWER:
1002                         /*
1003                          * Turn on ports, even if there isn't per-port switching.
1004                          * HC will report connect events even before this is set.
1005                          * However, hub_wq will ignore the roothub events until
1006                          * the roothub is registered.
1007                          */
1008                         writel(temp | PORT_POWER, port_array[wIndex]);
1009
1010                         temp = readl(port_array[wIndex]);
1011                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
1012
1013                         spin_unlock_irqrestore(&xhci->lock, flags);
1014                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1015                                         wIndex);
1016                         if (temp)
1017                                 usb_acpi_set_power_state(hcd->self.root_hub,
1018                                                 wIndex, true);
1019                         spin_lock_irqsave(&xhci->lock, flags);
1020                         break;
1021                 case USB_PORT_FEAT_RESET:
1022                         temp = (temp | PORT_RESET);
1023                         writel(temp, port_array[wIndex]);
1024
1025                         temp = readl(port_array[wIndex]);
1026                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
1027                         break;
1028                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1029                         xhci_set_remote_wake_mask(xhci, port_array,
1030                                         wIndex, wake_mask);
1031                         temp = readl(port_array[wIndex]);
1032                         xhci_dbg(xhci, "set port remote wake mask, "
1033                                         "actual port %d status  = 0x%x\n",
1034                                         wIndex, temp);
1035                         break;
1036                 case USB_PORT_FEAT_BH_PORT_RESET:
1037                         temp |= PORT_WR;
1038                         writel(temp, port_array[wIndex]);
1039
1040                         temp = readl(port_array[wIndex]);
1041                         break;
1042                 case USB_PORT_FEAT_U1_TIMEOUT:
1043                         if (hcd->speed != HCD_USB3)
1044                                 goto error;
1045                         temp = readl(port_array[wIndex] + PORTPMSC);
1046                         temp &= ~PORT_U1_TIMEOUT_MASK;
1047                         temp |= PORT_U1_TIMEOUT(timeout);
1048                         writel(temp, port_array[wIndex] + PORTPMSC);
1049                         break;
1050                 case USB_PORT_FEAT_U2_TIMEOUT:
1051                         if (hcd->speed != HCD_USB3)
1052                                 goto error;
1053                         temp = readl(port_array[wIndex] + PORTPMSC);
1054                         temp &= ~PORT_U2_TIMEOUT_MASK;
1055                         temp |= PORT_U2_TIMEOUT(timeout);
1056                         writel(temp, port_array[wIndex] + PORTPMSC);
1057                         break;
1058                 default:
1059                         goto error;
1060                 }
1061                 /* unblock any posted writes */
1062                 temp = readl(port_array[wIndex]);
1063                 break;
1064         case ClearPortFeature:
1065                 if (!wIndex || wIndex > max_ports)
1066                         goto error;
1067                 wIndex--;
1068                 temp = readl(port_array[wIndex]);
1069                 if (temp == 0xffffffff) {
1070                         retval = -ENODEV;
1071                         break;
1072                 }
1073                 /* FIXME: What new port features do we need to support? */
1074                 temp = xhci_port_state_to_neutral(temp);
1075                 switch (wValue) {
1076                 case USB_PORT_FEAT_SUSPEND:
1077                         temp = readl(port_array[wIndex]);
1078                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1079                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1080                         if (temp & PORT_RESET)
1081                                 goto error;
1082                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1083                                 if ((temp & PORT_PE) == 0)
1084                                         goto error;
1085
1086                                 xhci_set_link_state(xhci, port_array, wIndex,
1087                                                         XDEV_RESUME);
1088                                 spin_unlock_irqrestore(&xhci->lock, flags);
1089                                 msleep(20);
1090                                 spin_lock_irqsave(&xhci->lock, flags);
1091                                 xhci_set_link_state(xhci, port_array, wIndex,
1092                                                         XDEV_U0);
1093                         }
1094                         bus_state->port_c_suspend |= 1 << wIndex;
1095
1096                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1097                                         wIndex + 1);
1098                         if (!slot_id) {
1099                                 xhci_dbg(xhci, "slot_id is zero\n");
1100                                 goto error;
1101                         }
1102                         xhci_ring_device(xhci, slot_id);
1103                         break;
1104                 case USB_PORT_FEAT_C_SUSPEND:
1105                         bus_state->port_c_suspend &= ~(1 << wIndex);
1106                 case USB_PORT_FEAT_C_RESET:
1107                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1108                 case USB_PORT_FEAT_C_CONNECTION:
1109                 case USB_PORT_FEAT_C_OVER_CURRENT:
1110                 case USB_PORT_FEAT_C_ENABLE:
1111                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1112                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1113                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1114                                         port_array[wIndex], temp);
1115                         break;
1116                 case USB_PORT_FEAT_ENABLE:
1117                         xhci_disable_port(hcd, xhci, wIndex,
1118                                         port_array[wIndex], temp);
1119                         break;
1120                 case USB_PORT_FEAT_POWER:
1121                         writel(temp & ~PORT_POWER, port_array[wIndex]);
1122
1123                         spin_unlock_irqrestore(&xhci->lock, flags);
1124                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1125                                         wIndex);
1126                         if (temp)
1127                                 usb_acpi_set_power_state(hcd->self.root_hub,
1128                                                 wIndex, false);
1129                         spin_lock_irqsave(&xhci->lock, flags);
1130                         break;
1131                 default:
1132                         goto error;
1133                 }
1134                 break;
1135         default:
1136 error:
1137                 /* "stall" on error */
1138                 retval = -EPIPE;
1139         }
1140         spin_unlock_irqrestore(&xhci->lock, flags);
1141         return retval;
1142 }
1143
1144 /*
1145  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1146  * Ports are 0-indexed from the HCD point of view,
1147  * and 1-indexed from the USB core pointer of view.
1148  *
1149  * Note that the status change bits will be cleared as soon as a port status
1150  * change event is generated, so we use the saved status from that event.
1151  */
1152 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1153 {
1154         unsigned long flags;
1155         u32 temp, status;
1156         u32 mask;
1157         int i, retval;
1158         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1159         int max_ports;
1160         __le32 __iomem **port_array;
1161         struct xhci_bus_state *bus_state;
1162         bool reset_change = false;
1163
1164         max_ports = xhci_get_ports(hcd, &port_array);
1165         bus_state = &xhci->bus_state[hcd_index(hcd)];
1166
1167         /* Initial status is no changes */
1168         retval = (max_ports + 8) / 8;
1169         memset(buf, 0, retval);
1170
1171         /*
1172          * Inform the usbcore about resume-in-progress by returning
1173          * a non-zero value even if there are no status changes.
1174          */
1175         status = bus_state->resuming_ports;
1176
1177         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1178
1179         spin_lock_irqsave(&xhci->lock, flags);
1180         /* For each port, did anything change?  If so, set that bit in buf. */
1181         for (i = 0; i < max_ports; i++) {
1182                 temp = readl(port_array[i]);
1183                 if (temp == 0xffffffff) {
1184                         retval = -ENODEV;
1185                         break;
1186                 }
1187                 if ((temp & mask) != 0 ||
1188                         (bus_state->port_c_suspend & 1 << i) ||
1189                         (bus_state->resume_done[i] && time_after_eq(
1190                             jiffies, bus_state->resume_done[i]))) {
1191                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1192                         status = 1;
1193                 }
1194                 if ((temp & PORT_RC))
1195                         reset_change = true;
1196         }
1197         if (!status && !reset_change) {
1198                 xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
1199                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1200         }
1201         spin_unlock_irqrestore(&xhci->lock, flags);
1202         return status ? retval : 0;
1203 }
1204
1205 #ifdef CONFIG_PM
1206
1207 int xhci_bus_suspend(struct usb_hcd *hcd)
1208 {
1209         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1210         int max_ports, port_index;
1211         __le32 __iomem **port_array;
1212         struct xhci_bus_state *bus_state;
1213         unsigned long flags;
1214
1215         max_ports = xhci_get_ports(hcd, &port_array);
1216         bus_state = &xhci->bus_state[hcd_index(hcd)];
1217
1218         spin_lock_irqsave(&xhci->lock, flags);
1219
1220         if (hcd->self.root_hub->do_remote_wakeup) {
1221                 if (bus_state->resuming_ports ||        /* USB2 */
1222                     bus_state->port_remote_wakeup) {    /* USB3 */
1223                         spin_unlock_irqrestore(&xhci->lock, flags);
1224                         xhci_dbg(xhci, "suspend failed because a port is resuming\n");
1225                         return -EBUSY;
1226                 }
1227         }
1228
1229         port_index = max_ports;
1230         bus_state->bus_suspended = 0;
1231         while (port_index--) {
1232                 /* suspend the port if the port is not suspended */
1233                 u32 t1, t2;
1234                 int slot_id;
1235
1236                 t1 = readl(port_array[port_index]);
1237                 t2 = xhci_port_state_to_neutral(t1);
1238
1239                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
1240                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
1241                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1242                                         port_index + 1);
1243                         if (slot_id) {
1244                                 spin_unlock_irqrestore(&xhci->lock, flags);
1245                                 xhci_stop_device(xhci, slot_id, 1);
1246                                 spin_lock_irqsave(&xhci->lock, flags);
1247                         }
1248                         t2 &= ~PORT_PLS_MASK;
1249                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1250                         set_bit(port_index, &bus_state->bus_suspended);
1251                 }
1252                 /* USB core sets remote wake mask for USB 3.0 hubs,
1253                  * including the USB 3.0 roothub, but only if CONFIG_PM
1254                  * is enabled, so also enable remote wake here.
1255                  */
1256                 if (hcd->self.root_hub->do_remote_wakeup) {
1257                         if (t1 & PORT_CONNECT) {
1258                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1259                                 t2 &= ~PORT_WKCONN_E;
1260                         } else {
1261                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1262                                 t2 &= ~PORT_WKDISC_E;
1263                         }
1264                 } else
1265                         t2 &= ~PORT_WAKE_BITS;
1266
1267                 t1 = xhci_port_state_to_neutral(t1);
1268                 if (t1 != t2)
1269                         writel(t2, port_array[port_index]);
1270         }
1271         hcd->state = HC_STATE_SUSPENDED;
1272         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1273         spin_unlock_irqrestore(&xhci->lock, flags);
1274         return 0;
1275 }
1276
1277 int xhci_bus_resume(struct usb_hcd *hcd)
1278 {
1279         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1280         int max_ports, port_index;
1281         __le32 __iomem **port_array;
1282         struct xhci_bus_state *bus_state;
1283         u32 temp;
1284         unsigned long flags;
1285         unsigned long port_was_suspended = 0;
1286         bool need_usb2_u3_exit = false;
1287         int slot_id;
1288         int sret;
1289
1290         max_ports = xhci_get_ports(hcd, &port_array);
1291         bus_state = &xhci->bus_state[hcd_index(hcd)];
1292
1293         if (time_before(jiffies, bus_state->next_statechange))
1294                 msleep(5);
1295
1296         spin_lock_irqsave(&xhci->lock, flags);
1297         if (!HCD_HW_ACCESSIBLE(hcd)) {
1298                 spin_unlock_irqrestore(&xhci->lock, flags);
1299                 return -ESHUTDOWN;
1300         }
1301
1302         /* delay the irqs */
1303         temp = readl(&xhci->op_regs->command);
1304         temp &= ~CMD_EIE;
1305         writel(temp, &xhci->op_regs->command);
1306
1307         port_index = max_ports;
1308         while (port_index--) {
1309                 /* Check whether need resume ports. If needed
1310                    resume port and disable remote wakeup */
1311                 u32 temp;
1312
1313                 temp = readl(port_array[port_index]);
1314                 if (DEV_SUPERSPEED(temp))
1315                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1316                 else
1317                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
1318                 if (test_bit(port_index, &bus_state->bus_suspended) &&
1319                     (temp & PORT_PLS_MASK)) {
1320                         set_bit(port_index, &port_was_suspended);
1321                         if (!DEV_SUPERSPEED(temp)) {
1322                                 xhci_set_link_state(xhci, port_array,
1323                                                 port_index, XDEV_RESUME);
1324                                 need_usb2_u3_exit = true;
1325                         }
1326                 } else
1327                         writel(temp, port_array[port_index]);
1328         }
1329
1330         if (need_usb2_u3_exit) {
1331                 spin_unlock_irqrestore(&xhci->lock, flags);
1332                 msleep(20);
1333                 spin_lock_irqsave(&xhci->lock, flags);
1334         }
1335
1336         port_index = max_ports;
1337         while (port_index--) {
1338                 if (!(port_was_suspended & BIT(port_index)))
1339                         continue;
1340                 /* Clear PLC to poll it later after XDEV_U0 */
1341                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1342                 xhci_set_link_state(xhci, port_array, port_index, XDEV_U0);
1343         }
1344
1345         port_index = max_ports;
1346         while (port_index--) {
1347                 if (!(port_was_suspended & BIT(port_index)))
1348                         continue;
1349                 /* Poll and Clear PLC */
1350                 sret = xhci_handshake(port_array[port_index], PORT_PLC,
1351                                       PORT_PLC, 10 * 1000);
1352                 if (sret)
1353                         xhci_warn(xhci, "port %d resume PLC timeout\n",
1354                                   port_index);
1355                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1356                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1357                 if (slot_id)
1358                         xhci_ring_device(xhci, slot_id);
1359         }
1360
1361         (void) readl(&xhci->op_regs->command);
1362
1363         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1364         /* re-enable irqs */
1365         temp = readl(&xhci->op_regs->command);
1366         temp |= CMD_EIE;
1367         writel(temp, &xhci->op_regs->command);
1368         temp = readl(&xhci->op_regs->command);
1369
1370         spin_unlock_irqrestore(&xhci->lock, flags);
1371         return 0;
1372 }
1373
1374 #endif  /* CONFIG_PM */