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 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
 663 {
 664         u32 ext_stat = 0;
 665         int speed_id;
 666
 667         /* only support rx and tx lane counts of 1 in usb3.1 spec */
 668         speed_id = DEV_PORT_SPEED(raw_port_status);
 669         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
 670         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
 671
 672         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
 673         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
 674
 675         return ext_stat;
 676 }
 677
 678 /*
 679  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
 680  * 3.0 hubs use.
 681  *
 682  * Possible side effects:
 683  *  - Mark a port as being done with device resume,
 684  *    and ring the endpoint doorbells.
 685  *  - Stop the Synopsys redriver Compliance Mode polling.
 686  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
 687  */
 688 static u32 xhci_get_port_status(struct usb_hcd *hcd,
 689                 struct xhci_bus_state *bus_state,
 690                 __le32 __iomem **port_array,
 691                 u16 wIndex, u32 raw_port_status,
 692                 unsigned long flags)
 693         __releases(&xhci->lock)
 694         __acquires(&xhci->lock)
 695 {
 696         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 697         u32 status = 0;
 698         int slot_id;
 699
 700         /* wPortChange bits */
 701         if (raw_port_status & PORT_CSC)
 702                 status |= USB_PORT_STAT_C_CONNECTION << 16;
 703         if (raw_port_status & PORT_PEC)
 704                 status |= USB_PORT_STAT_C_ENABLE << 16;
 705         if ((raw_port_status & PORT_OCC))
 706                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 707         if ((raw_port_status & PORT_RC))
 708                 status |= USB_PORT_STAT_C_RESET << 16;
 709         /* USB3.0 only */
 710         if (hcd->speed >= HCD_USB3) {
 711                 /* Port link change with port in resume state should not be
 712                  * reported to usbcore, as this is an internal state to be
 713                  * handled by xhci driver. Reporting PLC to usbcore may
 714                  * cause usbcore clearing PLC first and port change event
 715                  * irq won't be generated.
 716                  */
 717                 if ((raw_port_status & PORT_PLC) &&
 718                         (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME)
 719                         status |= USB_PORT_STAT_C_LINK_STATE << 16;
 720                 if ((raw_port_status & PORT_WRC))
 721                         status |= USB_PORT_STAT_C_BH_RESET << 16;
 722                 if ((raw_port_status & PORT_CEC))
 723                         status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
 724         }
 725
 726         if (hcd->speed < HCD_USB3) {
 727                 if ((raw_port_status & PORT_PLS_MASK) == XDEV_U3
 728                                 && (raw_port_status & PORT_POWER))
 729                         status |= USB_PORT_STAT_SUSPEND;
 730         }
 731         if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
 732                 !DEV_SUPERSPEED_ANY(raw_port_status)) {
 733                 if ((raw_port_status & PORT_RESET) ||
 734                                 !(raw_port_status & PORT_PE))
 735                         return 0xffffffff;
 736                 if (time_after_eq(jiffies,
 737                                         bus_state->resume_done[wIndex])) {
 738                         int time_left;
 739
 740                         xhci_dbg(xhci, "Resume USB2 port %d\n",
 741                                         wIndex + 1);
 742                         bus_state->resume_done[wIndex] = 0;
 743                         clear_bit(wIndex, &bus_state->resuming_ports);
 744
 745                         set_bit(wIndex, &bus_state->rexit_ports);
 746                         xhci_set_link_state(xhci, port_array, wIndex,
 747                                         XDEV_U0);
 748
 749                         spin_unlock_irqrestore(&xhci->lock, flags);
 750                         time_left = wait_for_completion_timeout(
 751                                         &bus_state->rexit_done[wIndex],
 752                                         msecs_to_jiffies(
 753                                                 XHCI_MAX_REXIT_TIMEOUT));
 754                         spin_lock_irqsave(&xhci->lock, flags);
 755
 756                         if (time_left) {
 757                                 slot_id = xhci_find_slot_id_by_port(hcd,
 758                                                 xhci, wIndex + 1);
 759                                 if (!slot_id) {
 760                                         xhci_dbg(xhci, "slot_id is zero\n");
 761                                         return 0xffffffff;
 762                                 }
 763                                 xhci_ring_device(xhci, slot_id);
 764                         } else {
 765                                 int port_status = readl(port_array[wIndex]);
 766                                 xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n",
 767                                                 XHCI_MAX_REXIT_TIMEOUT,
 768                                                 port_status);
 769                                 status |= USB_PORT_STAT_SUSPEND;
 770                                 clear_bit(wIndex, &bus_state->rexit_ports);
 771                         }
 772
 773                         bus_state->port_c_suspend |= 1 << wIndex;
 774                         bus_state->suspended_ports &= ~(1 << wIndex);
 775                 } else {
 776                         /*
 777                          * The resume has been signaling for less than
 778                          * 20ms. Report the port status as SUSPEND,
 779                          * let the usbcore check port status again
 780                          * and clear resume signaling later.
 781                          */
 782                         status |= USB_PORT_STAT_SUSPEND;
 783                 }
 784         }
 785         if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 &&
 786             (raw_port_status & PORT_POWER)) {
 787                 if (bus_state->suspended_ports & (1 << wIndex)) {
 788                         bus_state->suspended_ports &= ~(1 << wIndex);
 789                         if (hcd->speed < HCD_USB3)
 790                                 bus_state->port_c_suspend |= 1 << wIndex;
 791                 }
 792                 bus_state->resume_done[wIndex] = 0;
 793                 clear_bit(wIndex, &bus_state->resuming_ports);
 794         }
 795         if (raw_port_status & PORT_CONNECT) {
 796                 status |= USB_PORT_STAT_CONNECTION;
 797                 status |= xhci_port_speed(raw_port_status);
 798         }
 799         if (raw_port_status & PORT_PE)
 800                 status |= USB_PORT_STAT_ENABLE;
 801         if (raw_port_status & PORT_OC)
 802                 status |= USB_PORT_STAT_OVERCURRENT;
 803         if (raw_port_status & PORT_RESET)
 804                 status |= USB_PORT_STAT_RESET;
 805         if (raw_port_status & PORT_POWER) {
 806                 if (hcd->speed >= HCD_USB3)
 807                         status |= USB_SS_PORT_STAT_POWER;
 808                 else
 809                         status |= USB_PORT_STAT_POWER;
 810         }
 811         /* Update Port Link State */
 812         if (hcd->speed >= HCD_USB3) {
 813                 xhci_hub_report_usb3_link_state(xhci, &status, raw_port_status);
 814                 /*
 815                  * Verify if all USB3 Ports Have entered U0 already.
 816                  * Delete Compliance Mode Timer if so.
 817                  */
 818                 xhci_del_comp_mod_timer(xhci, raw_port_status, wIndex);
 819         } else {
 820                 xhci_hub_report_usb2_link_state(&status, raw_port_status);
 821         }
 822         if (bus_state->port_c_suspend & (1 << wIndex))
 823                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 824
 825         return status;
 826 }
 827
 828 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 829                 u16 wIndex, char *buf, u16 wLength)
 830 {
 831         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 832         int max_ports;
 833         unsigned long flags;
 834         u32 temp, status;
 835         int retval = 0;
 836         __le32 __iomem **port_array;
 837         int slot_id;
 838         struct xhci_bus_state *bus_state;
 839         u16 link_state = 0;
 840         u16 wake_mask = 0;
 841         u16 timeout = 0;
 842
 843         max_ports = xhci_get_ports(hcd, &port_array);
 844         bus_state = &xhci->bus_state[hcd_index(hcd)];
 845
 846         spin_lock_irqsave(&xhci->lock, flags);
 847         switch (typeReq) {
 848         case GetHubStatus:
 849                 /* No power source, over-current reported per port */
 850                 memset(buf, 0, 4);
 851                 break;
 852         case GetHubDescriptor:
 853                 /* Check to make sure userspace is asking for the USB 3.0 hub
 854                  * descriptor for the USB 3.0 roothub.  If not, we stall the
 855                  * endpoint, like external hubs do.
 856                  */
 857                 if (hcd->speed >= HCD_USB3 &&
 858                                 (wLength < USB_DT_SS_HUB_SIZE ||
 859                                  wValue != (USB_DT_SS_HUB << 8))) {
 860                         xhci_dbg(xhci, "Wrong hub descriptor type for "
 861                                         "USB 3.0 roothub.\n");
 862                         goto error;
 863                 }
 864                 xhci_hub_descriptor(hcd, xhci,
 865                                 (struct usb_hub_descriptor *) buf);
 866                 break;
 867         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 868                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
 869                         goto error;
 870
 871                 if (hcd->speed < HCD_USB3)
 872                         goto error;
 873
 874                 retval = xhci_create_usb3_bos_desc(xhci, buf, wLength);
 875                 spin_unlock_irqrestore(&xhci->lock, flags);
 876                 return retval;
 877         case GetPortStatus:
 878                 if (!wIndex || wIndex > max_ports)
 879                         goto error;
 880                 wIndex--;
 881                 temp = readl(port_array[wIndex]);
 882                 if (temp == 0xffffffff) {
 883                         retval = -ENODEV;
 884                         break;
 885                 }
 886                 status = xhci_get_port_status(hcd, bus_state, port_array,
 887                                 wIndex, temp, flags);
 888                 if (status == 0xffffffff)
 889                         goto error;
 890
 891                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n",
 892                                 wIndex, temp);
 893                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
 894
 895                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
 896                 /* if USB 3.1 extended port status return additional 4 bytes */
 897                 if (wValue == 0x02) {
 898                         u32 port_li;
 899
 900                         if (hcd->speed < HCD_USB31 || wLength != 8) {
 901                                 xhci_err(xhci, "get ext port status invalid parameter\n");
 902                                 retval = -EINVAL;
 903                                 break;
 904                         }
 905                         port_li = readl(port_array[wIndex] + PORTLI);
 906                         status = xhci_get_ext_port_status(temp, port_li);
 907                         put_unaligned_le32(cpu_to_le32(status), &buf[4]);
 908                 }
 909                 break;
 910         case SetPortFeature:
 911                 if (wValue == USB_PORT_FEAT_LINK_STATE)
 912                         link_state = (wIndex & 0xff00) >> 3;
 913                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
 914                         wake_mask = wIndex & 0xff00;
 915                 /* The MSB of wIndex is the U1/U2 timeout */
 916                 timeout = (wIndex & 0xff00) >> 8;
 917                 wIndex &= 0xff;
 918                 if (!wIndex || wIndex > max_ports)
 919                         goto error;
 920                 wIndex--;
 921                 temp = readl(port_array[wIndex]);
 922                 if (temp == 0xffffffff) {
 923                         retval = -ENODEV;
 924                         break;
 925                 }
 926                 temp = xhci_port_state_to_neutral(temp);
 927                 /* FIXME: What new port features do we need to support? */
 928                 switch (wValue) {
 929                 case USB_PORT_FEAT_SUSPEND:
 930                         temp = readl(port_array[wIndex]);
 931                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
 932                                 /* Resume the port to U0 first */
 933                                 xhci_set_link_state(xhci, port_array, wIndex,
 934                                                         XDEV_U0);
 935                                 spin_unlock_irqrestore(&xhci->lock, flags);
 936                                 msleep(10);
 937                                 spin_lock_irqsave(&xhci->lock, flags);
 938                         }
 939                         /* In spec software should not attempt to suspend
 940                          * a port unless the port reports that it is in the
 941                          * enabled (PED = ‘1’,PLS < ‘3’) state.
 942                          */
 943                         temp = readl(port_array[wIndex]);
 944                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
 945                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
 946                                 xhci_warn(xhci, "USB core suspending device "
 947                                           "not in U0/U1/U2.\n");
 948                                 goto error;
 949                         }
 950
 951                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 952                                         wIndex + 1);
 953                         if (!slot_id) {
 954                                 xhci_warn(xhci, "slot_id is zero\n");
 955                                 goto error;
 956                         }
 957                         /* unlock to execute stop endpoint commands */
 958                         spin_unlock_irqrestore(&xhci->lock, flags);
 959                         xhci_stop_device(xhci, slot_id, 1);
 960                         spin_lock_irqsave(&xhci->lock, flags);
 961
 962                         xhci_set_link_state(xhci, port_array, wIndex, XDEV_U3);
 963
 964                         spin_unlock_irqrestore(&xhci->lock, flags);
 965                         msleep(10); /* wait device to enter */
 966                         spin_lock_irqsave(&xhci->lock, flags);
 967
 968                         temp = readl(port_array[wIndex]);
 969                         bus_state->suspended_ports |= 1 << wIndex;
 970                         break;
 971                 case USB_PORT_FEAT_LINK_STATE:
 972                         temp = readl(port_array[wIndex]);
 973
 974                         /* Disable port */
 975                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
 976                                 xhci_dbg(xhci, "Disable port %d\n", wIndex);
 977                                 temp = xhci_port_state_to_neutral(temp);
 978                                 /*
 979                                  * Clear all change bits, so that we get a new
 980                                  * connection event.
 981                                  */
 982                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
 983                                         PORT_OCC | PORT_RC | PORT_PLC |
 984                                         PORT_CEC;
 985                                 writel(temp | PORT_PE, port_array[wIndex]);
 986                                 temp = readl(port_array[wIndex]);
 987                                 break;
 988                         }
 989
 990                         /* Put link in RxDetect (enable port) */
 991                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
 992                                 xhci_dbg(xhci, "Enable port %d\n", wIndex);
 993                                 xhci_set_link_state(xhci, port_array, wIndex,
 994                                                 link_state);
 995                                 temp = readl(port_array[wIndex]);
 996                                 break;
 997                         }
 998
 999                         /* Software should not attempt to set
1000                          * port link state above '3' (U3) and the port
1001                          * must be enabled.
1002                          */
1003                         if ((temp & PORT_PE) == 0 ||
1004                                 (link_state > USB_SS_PORT_LS_U3)) {
1005                                 xhci_warn(xhci, "Cannot set link state.\n");
1006                                 goto error;
1007                         }
1008
1009                         if (link_state == USB_SS_PORT_LS_U3) {
1010                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1011                                                 wIndex + 1);
1012                                 if (slot_id) {
1013                                         /* unlock to execute stop endpoint
1014                                          * commands */
1015                                         spin_unlock_irqrestore(&xhci->lock,
1016                                                                 flags);
1017                                         xhci_stop_device(xhci, slot_id, 1);
1018                                         spin_lock_irqsave(&xhci->lock, flags);
1019                                 }
1020                         }
1021
1022                         xhci_set_link_state(xhci, port_array, wIndex,
1023                                                 link_state);
1024
1025                         spin_unlock_irqrestore(&xhci->lock, flags);
1026                         msleep(20); /* wait device to enter */
1027                         spin_lock_irqsave(&xhci->lock, flags);
1028
1029                         temp = readl(port_array[wIndex]);
1030                         if (link_state == USB_SS_PORT_LS_U3)
1031                                 bus_state->suspended_ports |= 1 << wIndex;
1032                         break;
1033                 case USB_PORT_FEAT_POWER:
1034                         /*
1035                          * Turn on ports, even if there isn't per-port switching.
1036                          * HC will report connect events even before this is set.
1037                          * However, hub_wq will ignore the roothub events until
1038                          * the roothub is registered.
1039                          */
1040                         writel(temp | PORT_POWER, port_array[wIndex]);
1041
1042                         temp = readl(port_array[wIndex]);
1043                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
1044
1045                         spin_unlock_irqrestore(&xhci->lock, flags);
1046                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1047                                         wIndex);
1048                         if (temp)
1049                                 usb_acpi_set_power_state(hcd->self.root_hub,
1050                                                 wIndex, true);
1051                         spin_lock_irqsave(&xhci->lock, flags);
1052                         break;
1053                 case USB_PORT_FEAT_RESET:
1054                         temp = (temp | PORT_RESET);
1055                         writel(temp, port_array[wIndex]);
1056
1057                         temp = readl(port_array[wIndex]);
1058                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
1059                         break;
1060                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1061                         xhci_set_remote_wake_mask(xhci, port_array,
1062                                         wIndex, wake_mask);
1063                         temp = readl(port_array[wIndex]);
1064                         xhci_dbg(xhci, "set port remote wake mask, "
1065                                         "actual port %d status  = 0x%x\n",
1066                                         wIndex, temp);
1067                         break;
1068                 case USB_PORT_FEAT_BH_PORT_RESET:
1069                         temp |= PORT_WR;
1070                         writel(temp, port_array[wIndex]);
1071
1072                         temp = readl(port_array[wIndex]);
1073                         break;
1074                 case USB_PORT_FEAT_U1_TIMEOUT:
1075                         if (hcd->speed < HCD_USB3)
1076                                 goto error;
1077                         temp = readl(port_array[wIndex] + PORTPMSC);
1078                         temp &= ~PORT_U1_TIMEOUT_MASK;
1079                         temp |= PORT_U1_TIMEOUT(timeout);
1080                         writel(temp, port_array[wIndex] + PORTPMSC);
1081                         break;
1082                 case USB_PORT_FEAT_U2_TIMEOUT:
1083                         if (hcd->speed < HCD_USB3)
1084                                 goto error;
1085                         temp = readl(port_array[wIndex] + PORTPMSC);
1086                         temp &= ~PORT_U2_TIMEOUT_MASK;
1087                         temp |= PORT_U2_TIMEOUT(timeout);
1088                         writel(temp, port_array[wIndex] + PORTPMSC);
1089                         break;
1090                 default:
1091                         goto error;
1092                 }
1093                 /* unblock any posted writes */
1094                 temp = readl(port_array[wIndex]);
1095                 break;
1096         case ClearPortFeature:
1097                 if (!wIndex || wIndex > max_ports)
1098                         goto error;
1099                 wIndex--;
1100                 temp = readl(port_array[wIndex]);
1101                 if (temp == 0xffffffff) {
1102                         retval = -ENODEV;
1103                         break;
1104                 }
1105                 /* FIXME: What new port features do we need to support? */
1106                 temp = xhci_port_state_to_neutral(temp);
1107                 switch (wValue) {
1108                 case USB_PORT_FEAT_SUSPEND:
1109                         temp = readl(port_array[wIndex]);
1110                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1111                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1112                         if (temp & PORT_RESET)
1113                                 goto error;
1114                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1115                                 if ((temp & PORT_PE) == 0)
1116                                         goto error;
1117
1118                                 xhci_set_link_state(xhci, port_array, wIndex,
1119                                                         XDEV_RESUME);
1120                                 spin_unlock_irqrestore(&xhci->lock, flags);
1121                                 msleep(20);
1122                                 spin_lock_irqsave(&xhci->lock, flags);
1123                                 xhci_set_link_state(xhci, port_array, wIndex,
1124                                                         XDEV_U0);
1125                         }
1126                         bus_state->port_c_suspend |= 1 << wIndex;
1127
1128                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1129                                         wIndex + 1);
1130                         if (!slot_id) {
1131                                 xhci_dbg(xhci, "slot_id is zero\n");
1132                                 goto error;
1133                         }
1134                         xhci_ring_device(xhci, slot_id);
1135                         break;
1136                 case USB_PORT_FEAT_C_SUSPEND:
1137                         bus_state->port_c_suspend &= ~(1 << wIndex);
1138                 case USB_PORT_FEAT_C_RESET:
1139                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1140                 case USB_PORT_FEAT_C_CONNECTION:
1141                 case USB_PORT_FEAT_C_OVER_CURRENT:
1142                 case USB_PORT_FEAT_C_ENABLE:
1143                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1144                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1145                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1146                                         port_array[wIndex], temp);
1147                         break;
1148                 case USB_PORT_FEAT_ENABLE:
1149                         xhci_disable_port(hcd, xhci, wIndex,
1150                                         port_array[wIndex], temp);
1151                         break;
1152                 case USB_PORT_FEAT_POWER:
1153                         writel(temp & ~PORT_POWER, port_array[wIndex]);
1154
1155                         spin_unlock_irqrestore(&xhci->lock, flags);
1156                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1157                                         wIndex);
1158                         if (temp)
1159                                 usb_acpi_set_power_state(hcd->self.root_hub,
1160                                                 wIndex, false);
1161                         spin_lock_irqsave(&xhci->lock, flags);
1162                         break;
1163                 default:
1164                         goto error;
1165                 }
1166                 break;
1167         default:
1168 error:
1169                 /* "stall" on error */
1170                 retval = -EPIPE;
1171         }
1172         spin_unlock_irqrestore(&xhci->lock, flags);
1173         return retval;
1174 }
1175
1176 /*
1177  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1178  * Ports are 0-indexed from the HCD point of view,
1179  * and 1-indexed from the USB core pointer of view.
1180  *
1181  * Note that the status change bits will be cleared as soon as a port status
1182  * change event is generated, so we use the saved status from that event.
1183  */
1184 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1185 {
1186         unsigned long flags;
1187         u32 temp, status;
1188         u32 mask;
1189         int i, retval;
1190         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1191         int max_ports;
1192         __le32 __iomem **port_array;
1193         struct xhci_bus_state *bus_state;
1194         bool reset_change = false;
1195
1196         max_ports = xhci_get_ports(hcd, &port_array);
1197         bus_state = &xhci->bus_state[hcd_index(hcd)];
1198
1199         /* Initial status is no changes */
1200         retval = (max_ports + 8) / 8;
1201         memset(buf, 0, retval);
1202
1203         /*
1204          * Inform the usbcore about resume-in-progress by returning
1205          * a non-zero value even if there are no status changes.
1206          */
1207         status = bus_state->resuming_ports;
1208
1209         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1210
1211         spin_lock_irqsave(&xhci->lock, flags);
1212         /* For each port, did anything change?  If so, set that bit in buf. */
1213         for (i = 0; i < max_ports; i++) {
1214                 temp = readl(port_array[i]);
1215                 if (temp == 0xffffffff) {
1216                         retval = -ENODEV;
1217                         break;
1218                 }
1219                 if ((temp & mask) != 0 ||
1220                         (bus_state->port_c_suspend & 1 << i) ||
1221                         (bus_state->resume_done[i] && time_after_eq(
1222                             jiffies, bus_state->resume_done[i]))) {
1223                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1224                         status = 1;
1225                 }
1226                 if ((temp & PORT_RC))
1227                         reset_change = true;
1228         }
1229         if (!status && !reset_change) {
1230                 xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
1231                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1232         }
1233         spin_unlock_irqrestore(&xhci->lock, flags);
1234         return status ? retval : 0;
1235 }
1236
1237 #ifdef CONFIG_PM
1238
1239 int xhci_bus_suspend(struct usb_hcd *hcd)
1240 {
1241         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1242         int max_ports, port_index;
1243         __le32 __iomem **port_array;
1244         struct xhci_bus_state *bus_state;
1245         unsigned long flags;
1246
1247         max_ports = xhci_get_ports(hcd, &port_array);
1248         bus_state = &xhci->bus_state[hcd_index(hcd)];
1249
1250         spin_lock_irqsave(&xhci->lock, flags);
1251
1252         if (hcd->self.root_hub->do_remote_wakeup) {
1253                 if (bus_state->resuming_ports ||        /* USB2 */
1254                     bus_state->port_remote_wakeup) {    /* USB3 */
1255                         spin_unlock_irqrestore(&xhci->lock, flags);
1256                         xhci_dbg(xhci, "suspend failed because a port is resuming\n");
1257                         return -EBUSY;
1258                 }
1259         }
1260
1261         port_index = max_ports;
1262         bus_state->bus_suspended = 0;
1263         while (port_index--) {
1264                 /* suspend the port if the port is not suspended */
1265                 u32 t1, t2;
1266                 int slot_id;
1267
1268                 t1 = readl(port_array[port_index]);
1269                 t2 = xhci_port_state_to_neutral(t1);
1270
1271                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
1272                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
1273                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1274                                         port_index + 1);
1275                         if (slot_id) {
1276                                 spin_unlock_irqrestore(&xhci->lock, flags);
1277                                 xhci_stop_device(xhci, slot_id, 1);
1278                                 spin_lock_irqsave(&xhci->lock, flags);
1279                         }
1280                         t2 &= ~PORT_PLS_MASK;
1281                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1282                         set_bit(port_index, &bus_state->bus_suspended);
1283                 }
1284                 /* USB core sets remote wake mask for USB 3.0 hubs,
1285                  * including the USB 3.0 roothub, but only if CONFIG_PM
1286                  * is enabled, so also enable remote wake here.
1287                  */
1288                 if (hcd->self.root_hub->do_remote_wakeup) {
1289                         if (t1 & PORT_CONNECT) {
1290                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1291                                 t2 &= ~PORT_WKCONN_E;
1292                         } else {
1293                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1294                                 t2 &= ~PORT_WKDISC_E;
1295                         }
1296                 } else
1297                         t2 &= ~PORT_WAKE_BITS;
1298
1299                 t1 = xhci_port_state_to_neutral(t1);
1300                 if (t1 != t2)
1301                         writel(t2, port_array[port_index]);
1302         }
1303         hcd->state = HC_STATE_SUSPENDED;
1304         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1305         spin_unlock_irqrestore(&xhci->lock, flags);
1306         return 0;
1307 }
1308
1309 int xhci_bus_resume(struct usb_hcd *hcd)
1310 {
1311         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1312         int max_ports, port_index;
1313         __le32 __iomem **port_array;
1314         struct xhci_bus_state *bus_state;
1315         u32 temp;
1316         unsigned long flags;
1317         unsigned long port_was_suspended = 0;
1318         bool need_usb2_u3_exit = false;
1319         int slot_id;
1320         int sret;
1321
1322         max_ports = xhci_get_ports(hcd, &port_array);
1323         bus_state = &xhci->bus_state[hcd_index(hcd)];
1324
1325         if (time_before(jiffies, bus_state->next_statechange))
1326                 msleep(5);
1327
1328         spin_lock_irqsave(&xhci->lock, flags);
1329         if (!HCD_HW_ACCESSIBLE(hcd)) {
1330                 spin_unlock_irqrestore(&xhci->lock, flags);
1331                 return -ESHUTDOWN;
1332         }
1333
1334         /* delay the irqs */
1335         temp = readl(&xhci->op_regs->command);
1336         temp &= ~CMD_EIE;
1337         writel(temp, &xhci->op_regs->command);
1338
1339         port_index = max_ports;
1340         while (port_index--) {
1341                 /* Check whether need resume ports. If needed
1342                    resume port and disable remote wakeup */
1343                 u32 temp;
1344
1345                 temp = readl(port_array[port_index]);
1346                 if (DEV_SUPERSPEED_ANY(temp))
1347                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1348                 else
1349                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
1350                 if (test_bit(port_index, &bus_state->bus_suspended) &&
1351                     (temp & PORT_PLS_MASK)) {
1352                         set_bit(port_index, &port_was_suspended);
1353                         if (!DEV_SUPERSPEED_ANY(temp)) {
1354                                 xhci_set_link_state(xhci, port_array,
1355                                                 port_index, XDEV_RESUME);
1356                                 need_usb2_u3_exit = true;
1357                         }
1358                 } else
1359                         writel(temp, port_array[port_index]);
1360         }
1361
1362         if (need_usb2_u3_exit) {
1363                 spin_unlock_irqrestore(&xhci->lock, flags);
1364                 msleep(20);
1365                 spin_lock_irqsave(&xhci->lock, flags);
1366         }
1367
1368         port_index = max_ports;
1369         while (port_index--) {
1370                 if (!(port_was_suspended & BIT(port_index)))
1371                         continue;
1372                 /* Clear PLC to poll it later after XDEV_U0 */
1373                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1374                 xhci_set_link_state(xhci, port_array, port_index, XDEV_U0);
1375         }
1376
1377         port_index = max_ports;
1378         while (port_index--) {
1379                 if (!(port_was_suspended & BIT(port_index)))
1380                         continue;
1381                 /* Poll and Clear PLC */
1382                 sret = xhci_handshake(port_array[port_index], PORT_PLC,
1383                                       PORT_PLC, 10 * 1000);
1384                 if (sret)
1385                         xhci_warn(xhci, "port %d resume PLC timeout\n",
1386                                   port_index);
1387                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1388                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1389                 if (slot_id)
1390                         xhci_ring_device(xhci, slot_id);
1391         }
1392
1393         (void) readl(&xhci->op_regs->command);
1394
1395         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1396         /* re-enable irqs */
1397         temp = readl(&xhci->op_regs->command);
1398         temp |= CMD_EIE;
1399         writel(temp, &xhci->op_regs->command);
1400         temp = readl(&xhci->op_regs->command);
1401
1402         spin_unlock_irqrestore(&xhci->lock, flags);
1403         return 0;
1404 }
1405
1406 #endif  /* CONFIG_PM */