drivers/usb/host/xhci-hub.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xHCI host controller driver
   4  *
   5  * Copyright (C) 2008 Intel Corp.
   6  *
   7  * Author: Sarah Sharp
   8  * Some code borrowed from the Linux EHCI driver.
   9  */
  10
  11
  12 #include <linux/slab.h>
  13 #include <asm/unaligned.h>
  14 #include <linux/bitfield.h>
  15
  16 #include "xhci.h"
  17 #include "xhci-trace.h"
  18
  19 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  20 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  21                          PORT_RC | PORT_PLC | PORT_PE)
  22
  23 /* Default sublink speed attribute of each lane */
  24 static u32 ssp_cap_default_ssa[] = {
  25         0x00050034, /* USB 3.0 SS Gen1x1 id:4 symmetric rx 5Gbps */
  26         0x000500b4, /* USB 3.0 SS Gen1x1 id:4 symmetric tx 5Gbps */
  27         0x000a4035, /* USB 3.1 SSP Gen2x1 id:5 symmetric rx 10Gbps */
  28         0x000a40b5, /* USB 3.1 SSP Gen2x1 id:5 symmetric tx 10Gbps */
  29         0x00054036, /* USB 3.2 SSP Gen1x2 id:6 symmetric rx 5Gbps */
  30         0x000540b6, /* USB 3.2 SSP Gen1x2 id:6 symmetric tx 5Gbps */
  31         0x000a4037, /* USB 3.2 SSP Gen2x2 id:7 symmetric rx 10Gbps */
  32         0x000a40b7, /* USB 3.2 SSP Gen2x2 id:7 symmetric tx 10Gbps */
  33 };
  34
  35 static int xhci_create_usb3x_bos_desc(struct xhci_hcd *xhci, char *buf,
  36                                       u16 wLength)
  37 {
  38         struct usb_bos_descriptor       *bos;
  39         struct usb_ss_cap_descriptor    *ss_cap;
  40         struct usb_ssp_cap_descriptor   *ssp_cap;
  41         struct xhci_port_cap            *port_cap = NULL;
  42         u16                             bcdUSB;
  43         u32                             reg;
  44         u32                             min_rate = 0;
  45         u8                              min_ssid;
  46         u8                              ssac;
  47         u8                              ssic;
  48         int                             offset;
  49         int                             i;
  50
  51         /* BOS descriptor */
  52         bos = (struct usb_bos_descriptor *)buf;
  53         bos->bLength = USB_DT_BOS_SIZE;
  54         bos->bDescriptorType = USB_DT_BOS;
  55         bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE +
  56                                         USB_DT_USB_SS_CAP_SIZE);
  57         bos->bNumDeviceCaps = 1;
  58
  59         /* Create the descriptor for port with the highest revision */
  60         for (i = 0; i < xhci->num_port_caps; i++) {
  61                 u8 major = xhci->port_caps[i].maj_rev;
  62                 u8 minor = xhci->port_caps[i].min_rev;
  63                 u16 rev = (major << 8) | minor;
  64
  65                 if (i == 0 || bcdUSB < rev) {
  66                         bcdUSB = rev;
  67                         port_cap = &xhci->port_caps[i];
  68                 }
  69         }
  70
  71         if (bcdUSB >= 0x0310) {
  72                 if (port_cap->psi_count) {
  73                         u8 num_sym_ssa = 0;
  74
  75                         for (i = 0; i < port_cap->psi_count; i++) {
  76                                 if ((port_cap->psi[i] & PLT_MASK) == PLT_SYM)
  77                                         num_sym_ssa++;
  78                         }
  79
  80                         ssac = port_cap->psi_count + num_sym_ssa - 1;
  81                         ssic = port_cap->psi_uid_count - 1;
  82                 } else {
  83                         if (bcdUSB >= 0x0320)
  84                                 ssac = 7;
  85                         else
  86                                 ssac = 3;
  87
  88                         ssic = (ssac + 1) / 2 - 1;
  89                 }
  90
  91                 bos->bNumDeviceCaps++;
  92                 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE +
  93                                                 USB_DT_USB_SS_CAP_SIZE +
  94                                                 USB_DT_USB_SSP_CAP_SIZE(ssac));
  95         }
  96
  97         if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
  98                 return wLength;
  99
 100         /* SuperSpeed USB Device Capability */
 101         ss_cap = (struct usb_ss_cap_descriptor *)&buf[USB_DT_BOS_SIZE];
 102         ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
 103         ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
 104         ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
 105         ss_cap->bmAttributes = 0; /* set later */
 106         ss_cap->wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION);
 107         ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
 108         ss_cap->bU1devExitLat = 0; /* set later */
 109         ss_cap->bU2DevExitLat = 0; /* set later */
 110
 111         reg = readl(&xhci->cap_regs->hcc_params);
 112         if (HCC_LTC(reg))
 113                 ss_cap->bmAttributes |= USB_LTM_SUPPORT;
 114
 115         if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
 116                 reg = readl(&xhci->cap_regs->hcs_params3);
 117                 ss_cap->bU1devExitLat = HCS_U1_LATENCY(reg);
 118                 ss_cap->bU2DevExitLat = cpu_to_le16(HCS_U2_LATENCY(reg));
 119         }
 120
 121         if (wLength < le16_to_cpu(bos->wTotalLength))
 122                 return wLength;
 123
 124         if (bcdUSB < 0x0310)
 125                 return le16_to_cpu(bos->wTotalLength);
 126
 127         ssp_cap = (struct usb_ssp_cap_descriptor *)&buf[USB_DT_BOS_SIZE +
 128                 USB_DT_USB_SS_CAP_SIZE];
 129         ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(ssac);
 130         ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
 131         ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
 132         ssp_cap->bReserved = 0;
 133         ssp_cap->wReserved = 0;
 134         ssp_cap->bmAttributes =
 135                 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_ATTRIBS, ssac) |
 136                             FIELD_PREP(USB_SSP_SUBLINK_SPEED_IDS, ssic));
 137
 138         if (!port_cap->psi_count) {
 139                 for (i = 0; i < ssac + 1; i++)
 140                         ssp_cap->bmSublinkSpeedAttr[i] =
 141                                 cpu_to_le32(ssp_cap_default_ssa[i]);
 142
 143                 min_ssid = 4;
 144                 goto out;
 145         }
 146
 147         offset = 0;
 148         for (i = 0; i < port_cap->psi_count; i++) {
 149                 u32 psi;
 150                 u32 attr;
 151                 u8 ssid;
 152                 u8 lp;
 153                 u8 lse;
 154                 u8 psie;
 155                 u16 lane_mantissa;
 156                 u16 psim;
 157                 u16 plt;
 158
 159                 psi = port_cap->psi[i];
 160                 ssid = XHCI_EXT_PORT_PSIV(psi);
 161                 lp = XHCI_EXT_PORT_LP(psi);
 162                 psie = XHCI_EXT_PORT_PSIE(psi);
 163                 psim = XHCI_EXT_PORT_PSIM(psi);
 164                 plt = psi & PLT_MASK;
 165
 166                 lse = psie;
 167                 lane_mantissa = psim;
 168
 169                 /* Shift to Gbps and set SSP Link Protocol if 10Gpbs */
 170                 for (; psie < USB_SSP_SUBLINK_SPEED_LSE_GBPS; psie++)
 171                         psim /= 1000;
 172
 173                 if (!min_rate || psim < min_rate) {
 174                         min_ssid = ssid;
 175                         min_rate = psim;
 176                 }
 177
 178                 /* Some host controllers don't set the link protocol for SSP */
 179                 if (psim >= 10)
 180                         lp = USB_SSP_SUBLINK_SPEED_LP_SSP;
 181
 182                 /*
 183                  * PSIM and PSIE represent the total speed of PSI. The BOS
 184                  * descriptor SSP sublink speed attribute lane mantissa
 185                  * describes the lane speed. E.g. PSIM and PSIE for gen2x2
 186                  * is 20Gbps, but the BOS descriptor lane speed mantissa is
 187                  * 10Gbps. Check and modify the mantissa value to match the
 188                  * lane speed.
 189                  */
 190                 if (bcdUSB == 0x0320 && plt == PLT_SYM) {
 191                         /*
 192                          * The PSI dword for gen1x2 and gen2x1 share the same
 193                          * values. But the lane speed for gen1x2 is 5Gbps while
 194                          * gen2x1 is 10Gbps. If the previous PSI dword SSID is
 195                          * 5 and the PSIE and PSIM match with SSID 6, let's
 196                          * assume that the controller follows the default speed
 197                          * id with SSID 6 for gen1x2.
 198                          */
 199                         if (ssid == 6 && psie == 3 && psim == 10 && i) {
 200                                 u32 prev = port_cap->psi[i - 1];
 201
 202                                 if ((prev & PLT_MASK) == PLT_SYM &&
 203                                     XHCI_EXT_PORT_PSIV(prev) == 5 &&
 204                                     XHCI_EXT_PORT_PSIE(prev) == 3 &&
 205                                     XHCI_EXT_PORT_PSIM(prev) == 10) {
 206                                         lse = USB_SSP_SUBLINK_SPEED_LSE_GBPS;
 207                                         lane_mantissa = 5;
 208                                 }
 209                         }
 210
 211                         if (psie == 3 && psim > 10) {
 212                                 lse = USB_SSP_SUBLINK_SPEED_LSE_GBPS;
 213                                 lane_mantissa = 10;
 214                         }
 215                 }
 216
 217                 attr = (FIELD_PREP(USB_SSP_SUBLINK_SPEED_SSID, ssid) |
 218                         FIELD_PREP(USB_SSP_SUBLINK_SPEED_LP, lp) |
 219                         FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSE, lse) |
 220                         FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSM, lane_mantissa));
 221
 222                 switch (plt) {
 223                 case PLT_SYM:
 224                         attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 225                                            USB_SSP_SUBLINK_SPEED_ST_SYM_RX);
 226                         ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 227
 228                         attr &= ~USB_SSP_SUBLINK_SPEED_ST;
 229                         attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 230                                            USB_SSP_SUBLINK_SPEED_ST_SYM_TX);
 231                         ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 232                         break;
 233                 case PLT_ASYM_RX:
 234                         attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 235                                            USB_SSP_SUBLINK_SPEED_ST_ASYM_RX);
 236                         ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 237                         break;
 238                 case PLT_ASYM_TX:
 239                         attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 240                                            USB_SSP_SUBLINK_SPEED_ST_ASYM_TX);
 241                         ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 242                         break;
 243                 }
 244         }
 245 out:
 246         ssp_cap->wFunctionalitySupport =
 247                 cpu_to_le16(FIELD_PREP(USB_SSP_MIN_SUBLINK_SPEED_ATTRIBUTE_ID,
 248                                        min_ssid) |
 249                             FIELD_PREP(USB_SSP_MIN_RX_LANE_COUNT, 1) |
 250                             FIELD_PREP(USB_SSP_MIN_TX_LANE_COUNT, 1));
 251
 252         return le16_to_cpu(bos->wTotalLength);
 253 }
 254
 255 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 256                 struct usb_hub_descriptor *desc, int ports)
 257 {
 258         u16 temp;
 259
 260         desc->bHubContrCurrent = 0;
 261
 262         desc->bNbrPorts = ports;
 263         temp = 0;
 264         /* Bits 1:0 - support per-port power switching, or power always on */
 265         if (HCC_PPC(xhci->hcc_params))
 266                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 267         else
 268                 temp |= HUB_CHAR_NO_LPSM;
 269         /* Bit  2 - root hubs are not part of a compound device */
 270         /* Bits 4:3 - individual port over current protection */
 271         temp |= HUB_CHAR_INDV_PORT_OCPM;
 272         /* Bits 6:5 - no TTs in root ports */
 273         /* Bit  7 - no port indicators */
 274         desc->wHubCharacteristics = cpu_to_le16(temp);
 275 }
 276
 277 /* Fill in the USB 2.0 roothub descriptor */
 278 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 279                 struct usb_hub_descriptor *desc)
 280 {
 281         int ports;
 282         u16 temp;
 283         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
 284         u32 portsc;
 285         unsigned int i;
 286         struct xhci_hub *rhub;
 287
 288         rhub = &xhci->usb2_rhub;
 289         ports = rhub->num_ports;
 290         xhci_common_hub_descriptor(xhci, desc, ports);
 291         desc->bDescriptorType = USB_DT_HUB;
 292         temp = 1 + (ports / 8);
 293         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
 294         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.8 says 20ms */
 295
 296         /* The Device Removable bits are reported on a byte granularity.
 297          * If the port doesn't exist within that byte, the bit is set to 0.
 298          */
 299         memset(port_removable, 0, sizeof(port_removable));
 300         for (i = 0; i < ports; i++) {
 301                 portsc = readl(rhub->ports[i]->addr);
 302                 /* If a device is removable, PORTSC reports a 0, same as in the
 303                  * hub descriptor DeviceRemovable bits.
 304                  */
 305                 if (portsc & PORT_DEV_REMOVE)
 306                         /* This math is hairy because bit 0 of DeviceRemovable
 307                          * is reserved, and bit 1 is for port 1, etc.
 308                          */
 309                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
 310         }
 311
 312         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
 313          * ports on it.  The USB 2.0 specification says that there are two
 314          * variable length fields at the end of the hub descriptor:
 315          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
 316          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
 317          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
 318          * 0xFF, so we initialize the both arrays (DeviceRemovable and
 319          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
 320          * set of ports that actually exist.
 321          */
 322         memset(desc->u.hs.DeviceRemovable, 0xff,
 323                         sizeof(desc->u.hs.DeviceRemovable));
 324         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 325                         sizeof(desc->u.hs.PortPwrCtrlMask));
 326
 327         for (i = 0; i < (ports + 1 + 7) / 8; i++)
 328                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 329                                 sizeof(__u8));
 330 }
 331
 332 /* Fill in the USB 3.0 roothub descriptor */
 333 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 334                 struct usb_hub_descriptor *desc)
 335 {
 336         int ports;
 337         u16 port_removable;
 338         u32 portsc;
 339         unsigned int i;
 340         struct xhci_hub *rhub;
 341
 342         rhub = &xhci->usb3_rhub;
 343         ports = rhub->num_ports;
 344         xhci_common_hub_descriptor(xhci, desc, ports);
 345         desc->bDescriptorType = USB_DT_SS_HUB;
 346         desc->bDescLength = USB_DT_SS_HUB_SIZE;
 347         desc->bPwrOn2PwrGood = 50;      /* usb 3.1 may fail if less than 100ms */
 348
 349         /* header decode latency should be zero for roothubs,
 350          * see section 4.23.5.2.
 351          */
 352         desc->u.ss.bHubHdrDecLat = 0;
 353         desc->u.ss.wHubDelay = 0;
 354
 355         port_removable = 0;
 356         /* bit 0 is reserved, bit 1 is for port 1, etc. */
 357         for (i = 0; i < ports; i++) {
 358                 portsc = readl(rhub->ports[i]->addr);
 359                 if (portsc & PORT_DEV_REMOVE)
 360                         port_removable |= 1 << (i + 1);
 361         }
 362
 363         desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
 364 }
 365
 366 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 367                 struct usb_hub_descriptor *desc)
 368 {
 369
 370         if (hcd->speed >= HCD_USB3)
 371                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
 372         else
 373                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
 374
 375 }
 376
 377 static unsigned int xhci_port_speed(unsigned int port_status)
 378 {
 379         if (DEV_LOWSPEED(port_status))
 380                 return USB_PORT_STAT_LOW_SPEED;
 381         if (DEV_HIGHSPEED(port_status))
 382                 return USB_PORT_STAT_HIGH_SPEED;
 383         /*
 384          * FIXME: Yes, we should check for full speed, but the core uses that as
 385          * a default in portspeed() in usb/core/hub.c (which is the only place
 386          * USB_PORT_STAT_*_SPEED is used).
 387          */
 388         return 0;
 389 }
 390
 391 /*
 392  * These bits are Read Only (RO) and should be saved and written to the
 393  * registers: 0, 3, 10:13, 30
 394  * connect status, over-current status, port speed, and device removable.
 395  * connect status and port speed are also sticky - meaning they're in
 396  * the AUX well and they aren't changed by a hot, warm, or cold reset.
 397  */
 398 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 399 /*
 400  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 401  * bits 5:8, 9, 14:15, 25:27
 402  * link state, port power, port indicator state, "wake on" enable state
 403  */
 404 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 405 /*
 406  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 407  * bit 4 (port reset)
 408  */
 409 #define XHCI_PORT_RW1S  ((1<<4))
 410 /*
 411  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 412  * bits 1, 17, 18, 19, 20, 21, 22, 23
 413  * port enable/disable, and
 414  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 415  * over-current, reset, link state, and L1 change
 416  */
 417 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 418 /*
 419  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 420  * latched in
 421  */
 422 #define XHCI_PORT_RW    ((1<<16))
 423 /*
 424  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 425  * bits 2, 24, 28:31
 426  */
 427 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 428
 429 /**
 430  * xhci_port_state_to_neutral() - Clean up read portsc value back into writeable
 431  * @state: u32 port value read from portsc register to be cleanup up
 432  *
 433  * Given a port state, this function returns a value that would result in the
 434  * port being in the same state, if the value was written to the port status
 435  * control register.
 436  * Save Read Only (RO) bits and save read/write bits where
 437  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 438  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 439  *
 440  * Return: u32 value that can be written back to portsc register without
 441  * changing port state.
 442  */
 443
 444 u32 xhci_port_state_to_neutral(u32 state)
 445 {
 446         /* Save read-only status and port state */
 447         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 448 }
 449 EXPORT_SYMBOL_GPL(xhci_port_state_to_neutral);
 450
 451 /**
 452  * xhci_find_slot_id_by_port() - Find slot id of a usb device on a roothub port
 453  * @hcd: pointer to hcd of the roothub
 454  * @xhci: pointer to xhci structure
 455  * @port: one-based port number of the port in this roothub.
 456  *
 457  * Return: Slot id of the usb device connected to the root port, 0 if not found
 458  */
 459
 460 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 461                 u16 port)
 462 {
 463         int slot_id;
 464         int i;
 465         enum usb_device_speed speed;
 466
 467         slot_id = 0;
 468         for (i = 0; i < MAX_HC_SLOTS; i++) {
 469                 if (!xhci->devs[i] || !xhci->devs[i]->udev)
 470                         continue;
 471                 speed = xhci->devs[i]->udev->speed;
 472                 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
 473                                 && xhci->devs[i]->fake_port == port) {
 474                         slot_id = i;
 475                         break;
 476                 }
 477         }
 478
 479         return slot_id;
 480 }
 481 EXPORT_SYMBOL_GPL(xhci_find_slot_id_by_port);
 482
 483 /*
 484  * Stop device
 485  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 486  * to complete.
 487  * suspend will set to 1, if suspend bit need to set in command.
 488  */
 489 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 490 {
 491         struct xhci_virt_device *virt_dev;
 492         struct xhci_command *cmd;
 493         unsigned long flags;
 494         int ret;
 495         int i;
 496
 497         ret = 0;
 498         virt_dev = xhci->devs[slot_id];
 499         if (!virt_dev)
 500                 return -ENODEV;
 501
 502         trace_xhci_stop_device(virt_dev);
 503
 504         cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
 505         if (!cmd)
 506                 return -ENOMEM;
 507
 508         spin_lock_irqsave(&xhci->lock, flags);
 509         for (i = LAST_EP_INDEX; i > 0; i--) {
 510                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 511                         struct xhci_ep_ctx *ep_ctx;
 512                         struct xhci_command *command;
 513
 514                         ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i);
 515
 516                         /* Check ep is running, required by AMD SNPS 3.1 xHC */
 517                         if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING)
 518                                 continue;
 519
 520                         command = xhci_alloc_command(xhci, false, GFP_NOWAIT);
 521                         if (!command) {
 522                                 spin_unlock_irqrestore(&xhci->lock, flags);
 523                                 ret = -ENOMEM;
 524                                 goto cmd_cleanup;
 525                         }
 526
 527                         ret = xhci_queue_stop_endpoint(xhci, command, slot_id,
 528                                                        i, suspend);
 529                         if (ret) {
 530                                 spin_unlock_irqrestore(&xhci->lock, flags);
 531                                 xhci_free_command(xhci, command);
 532                                 goto cmd_cleanup;
 533                         }
 534                 }
 535         }
 536         ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 537         if (ret) {
 538                 spin_unlock_irqrestore(&xhci->lock, flags);
 539                 goto cmd_cleanup;
 540         }
 541
 542         xhci_ring_cmd_db(xhci);
 543         spin_unlock_irqrestore(&xhci->lock, flags);
 544
 545         /* Wait for last stop endpoint command to finish */
 546         wait_for_completion(cmd->completion);
 547
 548         if (cmd->status == COMP_COMMAND_ABORTED ||
 549             cmd->status == COMP_COMMAND_RING_STOPPED) {
 550                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 551                 ret = -ETIME;
 552         }
 553
 554 cmd_cleanup:
 555         xhci_free_command(xhci, cmd);
 556         return ret;
 557 }
 558
 559 /*
 560  * Ring device, it rings the all doorbells unconditionally.
 561  */
 562 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 563 {
 564         int i, s;
 565         struct xhci_virt_ep *ep;
 566
 567         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 568                 ep = &xhci->devs[slot_id]->eps[i];
 569
 570                 if (ep->ep_state & EP_HAS_STREAMS) {
 571                         for (s = 1; s < ep->stream_info->num_streams; s++)
 572                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 573                 } else if (ep->ring && ep->ring->dequeue) {
 574                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 575                 }
 576         }
 577
 578         return;
 579 }
 580
 581 static void xhci_disable_port(struct xhci_hcd *xhci, struct xhci_port *port)
 582 {
 583         struct usb_hcd *hcd;
 584         u32 portsc;
 585
 586         hcd = port->rhub->hcd;
 587
 588         /* Don't allow the USB core to disable SuperSpeed ports. */
 589         if (hcd->speed >= HCD_USB3) {
 590                 xhci_dbg(xhci, "Ignoring request to disable SuperSpeed port.\n");
 591                 return;
 592         }
 593
 594         if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
 595                 xhci_dbg(xhci,
 596                          "Broken Port Enabled/Disabled, ignoring port disable request.\n");
 597                 return;
 598         }
 599
 600         portsc = readl(port->addr);
 601         portsc = xhci_port_state_to_neutral(portsc);
 602
 603         /* Write 1 to disable the port */
 604         writel(portsc | PORT_PE, port->addr);
 605
 606         portsc = readl(port->addr);
 607         xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n",
 608                  hcd->self.busnum, port->hcd_portnum + 1, portsc);
 609 }
 610
 611 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 612                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 613 {
 614         char *port_change_bit;
 615         u32 status;
 616
 617         switch (wValue) {
 618         case USB_PORT_FEAT_C_RESET:
 619                 status = PORT_RC;
 620                 port_change_bit = "reset";
 621                 break;
 622         case USB_PORT_FEAT_C_BH_PORT_RESET:
 623                 status = PORT_WRC;
 624                 port_change_bit = "warm(BH) reset";
 625                 break;
 626         case USB_PORT_FEAT_C_CONNECTION:
 627                 status = PORT_CSC;
 628                 port_change_bit = "connect";
 629                 break;
 630         case USB_PORT_FEAT_C_OVER_CURRENT:
 631                 status = PORT_OCC;
 632                 port_change_bit = "over-current";
 633                 break;
 634         case USB_PORT_FEAT_C_ENABLE:
 635                 status = PORT_PEC;
 636                 port_change_bit = "enable/disable";
 637                 break;
 638         case USB_PORT_FEAT_C_SUSPEND:
 639                 status = PORT_PLC;
 640                 port_change_bit = "suspend/resume";
 641                 break;
 642         case USB_PORT_FEAT_C_PORT_LINK_STATE:
 643                 status = PORT_PLC;
 644                 port_change_bit = "link state";
 645                 break;
 646         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 647                 status = PORT_CEC;
 648                 port_change_bit = "config error";
 649                 break;
 650         default:
 651                 /* Should never happen */
 652                 return;
 653         }
 654         /* Change bits are all write 1 to clear */
 655         writel(port_status | status, addr);
 656         port_status = readl(addr);
 657
 658         xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n",
 659                  wIndex + 1, port_change_bit, port_status);
 660 }
 661
 662 struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
 663 {
 664         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 665
 666         if (hcd->speed >= HCD_USB3)
 667                 return &xhci->usb3_rhub;
 668         return &xhci->usb2_rhub;
 669 }
 670
 671 /*
 672  * xhci_set_port_power() must be called with xhci->lock held.
 673  * It will release and re-aquire the lock while calling ACPI
 674  * method.
 675  */
 676 static void xhci_set_port_power(struct xhci_hcd *xhci, struct xhci_port *port,
 677                                 bool on, unsigned long *flags)
 678         __must_hold(&xhci->lock)
 679 {
 680         struct usb_hcd *hcd;
 681         u32 temp;
 682
 683         hcd = port->rhub->hcd;
 684         temp = readl(port->addr);
 685
 686         xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n",
 687                  hcd->self.busnum, port->hcd_portnum + 1, on ? "ON" : "OFF", temp);
 688
 689         temp = xhci_port_state_to_neutral(temp);
 690
 691         if (on) {
 692                 /* Power on */
 693                 writel(temp | PORT_POWER, port->addr);
 694                 readl(port->addr);
 695         } else {
 696                 /* Power off */
 697                 writel(temp & ~PORT_POWER, port->addr);
 698         }
 699
 700         spin_unlock_irqrestore(&xhci->lock, *flags);
 701         temp = usb_acpi_power_manageable(hcd->self.root_hub,
 702                                          port->hcd_portnum);
 703         if (temp)
 704                 usb_acpi_set_power_state(hcd->self.root_hub,
 705                                          port->hcd_portnum, on);
 706         spin_lock_irqsave(&xhci->lock, *flags);
 707 }
 708
 709 static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
 710         u16 test_mode, u16 wIndex)
 711 {
 712         u32 temp;
 713         struct xhci_port *port;
 714
 715         /* xhci only supports test mode for usb2 ports */
 716         port = xhci->usb2_rhub.ports[wIndex];
 717         temp = readl(port->addr + PORTPMSC);
 718         temp |= test_mode << PORT_TEST_MODE_SHIFT;
 719         writel(temp, port->addr + PORTPMSC);
 720         xhci->test_mode = test_mode;
 721         if (test_mode == USB_TEST_FORCE_ENABLE)
 722                 xhci_start(xhci);
 723 }
 724
 725 static int xhci_enter_test_mode(struct xhci_hcd *xhci,
 726                                 u16 test_mode, u16 wIndex, unsigned long *flags)
 727         __must_hold(&xhci->lock)
 728 {
 729         int i, retval;
 730
 731         /* Disable all Device Slots */
 732         xhci_dbg(xhci, "Disable all slots\n");
 733         spin_unlock_irqrestore(&xhci->lock, *flags);
 734         for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 735                 if (!xhci->devs[i])
 736                         continue;
 737
 738                 retval = xhci_disable_slot(xhci, i);
 739                 xhci_free_virt_device(xhci, i);
 740                 if (retval)
 741                         xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 742                                  i, retval);
 743         }
 744         spin_lock_irqsave(&xhci->lock, *flags);
 745         /* Put all ports to the Disable state by clear PP */
 746         xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 747         /* Power off USB3 ports*/
 748         for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
 749                 xhci_set_port_power(xhci, xhci->usb3_rhub.ports[i], false, flags);
 750         /* Power off USB2 ports*/
 751         for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
 752                 xhci_set_port_power(xhci, xhci->usb2_rhub.ports[i], false, flags);
 753         /* Stop the controller */
 754         xhci_dbg(xhci, "Stop controller\n");
 755         retval = xhci_halt(xhci);
 756         if (retval)
 757                 return retval;
 758         /* Disable runtime PM for test mode */
 759         pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller);
 760         /* Set PORTPMSC.PTC field to enter selected test mode */
 761         /* Port is selected by wIndex. port_id = wIndex + 1 */
 762         xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n",
 763                                         test_mode, wIndex + 1);
 764         xhci_port_set_test_mode(xhci, test_mode, wIndex);
 765         return retval;
 766 }
 767
 768 static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 769 {
 770         int retval;
 771
 772         if (!xhci->test_mode) {
 773                 xhci_err(xhci, "Not in test mode, do nothing.\n");
 774                 return 0;
 775         }
 776         if (xhci->test_mode == USB_TEST_FORCE_ENABLE &&
 777                 !(xhci->xhc_state & XHCI_STATE_HALTED)) {
 778                 retval = xhci_halt(xhci);
 779                 if (retval)
 780                         return retval;
 781         }
 782         pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 783         xhci->test_mode = 0;
 784         return xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 785 }
 786
 787 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
 788                          u32 link_state)
 789 {
 790         u32 temp;
 791         u32 portsc;
 792
 793         portsc = readl(port->addr);
 794         temp = xhci_port_state_to_neutral(portsc);
 795         temp &= ~PORT_PLS_MASK;
 796         temp |= PORT_LINK_STROBE | link_state;
 797         writel(temp, port->addr);
 798
 799         xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x",
 800                  port->rhub->hcd->self.busnum, port->hcd_portnum + 1,
 801                  portsc, temp);
 802 }
 803
 804 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 805                                       struct xhci_port *port, u16 wake_mask)
 806 {
 807         u32 temp;
 808
 809         temp = readl(port->addr);
 810         temp = xhci_port_state_to_neutral(temp);
 811
 812         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 813                 temp |= PORT_WKCONN_E;
 814         else
 815                 temp &= ~PORT_WKCONN_E;
 816
 817         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 818                 temp |= PORT_WKDISC_E;
 819         else
 820                 temp &= ~PORT_WKDISC_E;
 821
 822         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 823                 temp |= PORT_WKOC_E;
 824         else
 825                 temp &= ~PORT_WKOC_E;
 826
 827         writel(temp, port->addr);
 828 }
 829
 830 /* Test and clear port RWC bit */
 831 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 832                              u32 port_bit)
 833 {
 834         u32 temp;
 835
 836         temp = readl(port->addr);
 837         if (temp & port_bit) {
 838                 temp = xhci_port_state_to_neutral(temp);
 839                 temp |= port_bit;
 840                 writel(temp, port->addr);
 841         }
 842 }
 843
 844 /* Updates Link Status for super Speed port */
 845 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 846                 u32 *status, u32 status_reg)
 847 {
 848         u32 pls = status_reg & PORT_PLS_MASK;
 849
 850         /* When the CAS bit is set then warm reset
 851          * should be performed on port
 852          */
 853         if (status_reg & PORT_CAS) {
 854                 /* The CAS bit can be set while the port is
 855                  * in any link state.
 856                  * Only roothubs have CAS bit, so we
 857                  * pretend to be in compliance mode
 858                  * unless we're already in compliance
 859                  * or the inactive state.
 860                  */
 861                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
 862                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
 863                         pls = USB_SS_PORT_LS_COMP_MOD;
 864                 }
 865                 /* Return also connection bit -
 866                  * hub state machine resets port
 867                  * when this bit is set.
 868                  */
 869                 pls |= USB_PORT_STAT_CONNECTION;
 870         } else {
 871                 /*
 872                  * Resume state is an xHCI internal state.  Do not report it to
 873                  * usb core, instead, pretend to be U3, thus usb core knows
 874                  * it's not ready for transfer.
 875                  */
 876                 if (pls == XDEV_RESUME) {
 877                         *status |= USB_SS_PORT_LS_U3;
 878                         return;
 879                 }
 880
 881                 /*
 882                  * If CAS bit isn't set but the Port is already at
 883                  * Compliance Mode, fake a connection so the USB core
 884                  * notices the Compliance state and resets the port.
 885                  * This resolves an issue generated by the SN65LVPE502CP
 886                  * in which sometimes the port enters compliance mode
 887                  * caused by a delay on the host-device negotiation.
 888                  */
 889                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 890                                 (pls == USB_SS_PORT_LS_COMP_MOD))
 891                         pls |= USB_PORT_STAT_CONNECTION;
 892         }
 893
 894         /* update status field */
 895         *status |= pls;
 896 }
 897
 898 /*
 899  * Function for Compliance Mode Quirk.
 900  *
 901  * This Function verifies if all xhc USB3 ports have entered U0, if so,
 902  * the compliance mode timer is deleted. A port won't enter
 903  * compliance mode if it has previously entered U0.
 904  */
 905 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 906                                     u16 wIndex)
 907 {
 908         u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1);
 909         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 910
 911         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 912                 return;
 913
 914         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 915                 xhci->port_status_u0 |= 1 << wIndex;
 916                 if (xhci->port_status_u0 == all_ports_seen_u0) {
 917                         del_timer_sync(&xhci->comp_mode_recovery_timer);
 918                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 919                                 "All USB3 ports have entered U0 already!");
 920                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 921                                 "Compliance Mode Recovery Timer Deleted.");
 922                 }
 923         }
 924 }
 925
 926 static int xhci_handle_usb2_port_link_resume(struct xhci_port *port,
 927                                              u32 portsc,
 928                                              unsigned long *flags)
 929 {
 930         struct xhci_bus_state *bus_state;
 931         struct xhci_hcd *xhci;
 932         struct usb_hcd *hcd;
 933         int slot_id;
 934         u32 wIndex;
 935
 936         hcd = port->rhub->hcd;
 937         bus_state = &port->rhub->bus_state;
 938         xhci = hcd_to_xhci(hcd);
 939         wIndex = port->hcd_portnum;
 940
 941         if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) {
 942                 return -EINVAL;
 943         }
 944         /* did port event handler already start resume timing? */
 945         if (!port->resume_timestamp) {
 946                 /* If not, maybe we are in a host initated resume? */
 947                 if (test_bit(wIndex, &bus_state->resuming_ports)) {
 948                         /* Host initated resume doesn't time the resume
 949                          * signalling using resume_done[].
 950                          * It manually sets RESUME state, sleeps 20ms
 951                          * and sets U0 state. This should probably be
 952                          * changed, but not right now.
 953                          */
 954                 } else {
 955                         /* port resume was discovered now and here,
 956                          * start resume timing
 957                          */
 958                         unsigned long timeout = jiffies +
 959                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 960
 961                         set_bit(wIndex, &bus_state->resuming_ports);
 962                         port->resume_timestamp = timeout;
 963                         mod_timer(&hcd->rh_timer, timeout);
 964                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 965                 }
 966         /* Has resume been signalled for USB_RESUME_TIME yet? */
 967         } else if (time_after_eq(jiffies, port->resume_timestamp)) {
 968                 int time_left;
 969
 970                 xhci_dbg(xhci, "resume USB2 port %d-%d\n",
 971                          hcd->self.busnum, wIndex + 1);
 972
 973                 port->resume_timestamp = 0;
 974                 clear_bit(wIndex, &bus_state->resuming_ports);
 975
 976                 reinit_completion(&port->rexit_done);
 977                 port->rexit_active = true;
 978
 979                 xhci_test_and_clear_bit(xhci, port, PORT_PLC);
 980                 xhci_set_link_state(xhci, port, XDEV_U0);
 981
 982                 spin_unlock_irqrestore(&xhci->lock, *flags);
 983                 time_left = wait_for_completion_timeout(
 984                         &port->rexit_done,
 985                         msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS));
 986                 spin_lock_irqsave(&xhci->lock, *flags);
 987
 988                 if (time_left) {
 989                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 990                                                             wIndex + 1);
 991                         if (!slot_id) {
 992                                 xhci_dbg(xhci, "slot_id is zero\n");
 993                                 return -ENODEV;
 994                         }
 995                         xhci_ring_device(xhci, slot_id);
 996                 } else {
 997                         int port_status = readl(port->addr);
 998
 999                         xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n",
1000                                   hcd->self.busnum, wIndex + 1, port_status);
1001                         /*
1002                          * keep rexit_active set if U0 transition failed so we
1003                          * know to report PORT_STAT_SUSPEND status back to
1004                          * usbcore. It will be cleared later once the port is
1005                          * out of RESUME/U3 state
1006                          */
1007                 }
1008
1009                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1010                 bus_state->port_c_suspend |= 1 << wIndex;
1011                 bus_state->suspended_ports &= ~(1 << wIndex);
1012         }
1013
1014         return 0;
1015 }
1016
1017 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
1018 {
1019         u32 ext_stat = 0;
1020         int speed_id;
1021
1022         /* only support rx and tx lane counts of 1 in usb3.1 spec */
1023         speed_id = DEV_PORT_SPEED(raw_port_status);
1024         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
1025         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
1026
1027         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
1028         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
1029
1030         return ext_stat;
1031 }
1032
1033 static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
1034                                       u32 portsc)
1035 {
1036         struct xhci_bus_state *bus_state;
1037         struct xhci_hcd *xhci;
1038         struct usb_hcd *hcd;
1039         u32 link_state;
1040         u32 portnum;
1041
1042         bus_state = &port->rhub->bus_state;
1043         xhci = hcd_to_xhci(port->rhub->hcd);
1044         hcd = port->rhub->hcd;
1045         link_state = portsc & PORT_PLS_MASK;
1046         portnum = port->hcd_portnum;
1047
1048         /* USB3 specific wPortChange bits
1049          *
1050          * Port link change with port in resume state should not be
1051          * reported to usbcore, as this is an internal state to be
1052          * handled by xhci driver. Reporting PLC to usbcore may
1053          * cause usbcore clearing PLC first and port change event
1054          * irq won't be generated.
1055          */
1056
1057         if (portsc & PORT_PLC && (link_state != XDEV_RESUME))
1058                 *status |= USB_PORT_STAT_C_LINK_STATE << 16;
1059         if (portsc & PORT_WRC)
1060                 *status |= USB_PORT_STAT_C_BH_RESET << 16;
1061         if (portsc & PORT_CEC)
1062                 *status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
1063
1064         /* USB3 specific wPortStatus bits */
1065         if (portsc & PORT_POWER) {
1066                 *status |= USB_SS_PORT_STAT_POWER;
1067                 /* link state handling */
1068                 if (link_state == XDEV_U0)
1069                         bus_state->suspended_ports &= ~(1 << portnum);
1070         }
1071
1072         /* remote wake resume signaling complete */
1073         if (bus_state->port_remote_wakeup & (1 << portnum) &&
1074             link_state != XDEV_RESUME &&
1075             link_state != XDEV_RECOVERY) {
1076                 bus_state->port_remote_wakeup &= ~(1 << portnum);
1077                 usb_hcd_end_port_resume(&hcd->self, portnum);
1078         }
1079
1080         xhci_hub_report_usb3_link_state(xhci, status, portsc);
1081         xhci_del_comp_mod_timer(xhci, portsc, portnum);
1082 }
1083
1084 static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
1085                                       u32 portsc, unsigned long *flags)
1086 {
1087         struct xhci_bus_state *bus_state;
1088         u32 link_state;
1089         u32 portnum;
1090         int err;
1091
1092         bus_state = &port->rhub->bus_state;
1093         link_state = portsc & PORT_PLS_MASK;
1094         portnum = port->hcd_portnum;
1095
1096         /* USB2 wPortStatus bits */
1097         if (portsc & PORT_POWER) {
1098                 *status |= USB_PORT_STAT_POWER;
1099
1100                 /* link state is only valid if port is powered */
1101                 if (link_state == XDEV_U3)
1102                         *status |= USB_PORT_STAT_SUSPEND;
1103                 if (link_state == XDEV_U2)
1104                         *status |= USB_PORT_STAT_L1;
1105                 if (link_state == XDEV_U0) {
1106                         if (bus_state->suspended_ports & (1 << portnum)) {
1107                                 bus_state->suspended_ports &= ~(1 << portnum);
1108                                 bus_state->port_c_suspend |= 1 << portnum;
1109                         }
1110                 }
1111                 if (link_state == XDEV_RESUME) {
1112                         err = xhci_handle_usb2_port_link_resume(port, portsc,
1113                                                                 flags);
1114                         if (err < 0)
1115                                 *status = 0xffffffff;
1116                         else if (port->resume_timestamp || port->rexit_active)
1117                                 *status |= USB_PORT_STAT_SUSPEND;
1118                 }
1119         }
1120
1121         /*
1122          * Clear usb2 resume signalling variables if port is no longer suspended
1123          * or resuming. Port either resumed to U0/U1/U2, disconnected, or in a
1124          * error state. Resume related variables should be cleared in all those cases.
1125          */
1126         if (link_state != XDEV_U3 && link_state != XDEV_RESUME) {
1127                 if (port->resume_timestamp ||
1128                     test_bit(portnum, &bus_state->resuming_ports)) {
1129                         port->resume_timestamp = 0;
1130                         clear_bit(portnum, &bus_state->resuming_ports);
1131                         usb_hcd_end_port_resume(&port->rhub->hcd->self, portnum);
1132                 }
1133                 port->rexit_active = 0;
1134         }
1135 }
1136
1137 /*
1138  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
1139  * 3.0 hubs use.
1140  *
1141  * Possible side effects:
1142  *  - Mark a port as being done with device resume,
1143  *    and ring the endpoint doorbells.
1144  *  - Stop the Synopsys redriver Compliance Mode polling.
1145  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
1146  */
1147 static u32 xhci_get_port_status(struct usb_hcd *hcd,
1148                 struct xhci_bus_state *bus_state,
1149         u16 wIndex, u32 raw_port_status,
1150                 unsigned long *flags)
1151         __releases(&xhci->lock)
1152         __acquires(&xhci->lock)
1153 {
1154         u32 status = 0;
1155         struct xhci_hub *rhub;
1156         struct xhci_port *port;
1157
1158         rhub = xhci_get_rhub(hcd);
1159         port = rhub->ports[wIndex];
1160
1161         /* common wPortChange bits */
1162         if (raw_port_status & PORT_CSC)
1163                 status |= USB_PORT_STAT_C_CONNECTION << 16;
1164         if (raw_port_status & PORT_PEC)
1165                 status |= USB_PORT_STAT_C_ENABLE << 16;
1166         if ((raw_port_status & PORT_OCC))
1167                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1168         if ((raw_port_status & PORT_RC))
1169                 status |= USB_PORT_STAT_C_RESET << 16;
1170
1171         /* common wPortStatus bits */
1172         if (raw_port_status & PORT_CONNECT) {
1173                 status |= USB_PORT_STAT_CONNECTION;
1174                 status |= xhci_port_speed(raw_port_status);
1175         }
1176         if (raw_port_status & PORT_PE)
1177                 status |= USB_PORT_STAT_ENABLE;
1178         if (raw_port_status & PORT_OC)
1179                 status |= USB_PORT_STAT_OVERCURRENT;
1180         if (raw_port_status & PORT_RESET)
1181                 status |= USB_PORT_STAT_RESET;
1182
1183         /* USB2 and USB3 specific bits, including Port Link State */
1184         if (hcd->speed >= HCD_USB3)
1185                 xhci_get_usb3_port_status(port, &status, raw_port_status);
1186         else
1187                 xhci_get_usb2_port_status(port, &status, raw_port_status,
1188                                           flags);
1189
1190         if (bus_state->port_c_suspend & (1 << wIndex))
1191                 status |= USB_PORT_STAT_C_SUSPEND << 16;
1192
1193         return status;
1194 }
1195
1196 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
1197                 u16 wIndex, char *buf, u16 wLength)
1198 {
1199         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1200         int max_ports;
1201         unsigned long flags;
1202         u32 temp, status;
1203         int retval = 0;
1204         int slot_id;
1205         struct xhci_bus_state *bus_state;
1206         u16 link_state = 0;
1207         u16 wake_mask = 0;
1208         u16 timeout = 0;
1209         u16 test_mode = 0;
1210         struct xhci_hub *rhub;
1211         struct xhci_port **ports;
1212         struct xhci_port *port;
1213         int portnum1;
1214
1215         rhub = xhci_get_rhub(hcd);
1216         ports = rhub->ports;
1217         max_ports = rhub->num_ports;
1218         bus_state = &rhub->bus_state;
1219         portnum1 = wIndex & 0xff;
1220
1221         spin_lock_irqsave(&xhci->lock, flags);
1222         switch (typeReq) {
1223         case GetHubStatus:
1224                 /* No power source, over-current reported per port */
1225                 memset(buf, 0, 4);
1226                 break;
1227         case GetHubDescriptor:
1228                 /* Check to make sure userspace is asking for the USB 3.0 hub
1229                  * descriptor for the USB 3.0 roothub.  If not, we stall the
1230                  * endpoint, like external hubs do.
1231                  */
1232                 if (hcd->speed >= HCD_USB3 &&
1233                                 (wLength < USB_DT_SS_HUB_SIZE ||
1234                                  wValue != (USB_DT_SS_HUB << 8))) {
1235                         xhci_dbg(xhci, "Wrong hub descriptor type for "
1236                                         "USB 3.0 roothub.\n");
1237                         goto error;
1238                 }
1239                 xhci_hub_descriptor(hcd, xhci,
1240                                 (struct usb_hub_descriptor *) buf);
1241                 break;
1242         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1243                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
1244                         goto error;
1245
1246                 if (hcd->speed < HCD_USB3)
1247                         goto error;
1248
1249                 retval = xhci_create_usb3x_bos_desc(xhci, buf, wLength);
1250                 spin_unlock_irqrestore(&xhci->lock, flags);
1251                 return retval;
1252         case GetPortStatus:
1253                 if (!portnum1 || portnum1 > max_ports)
1254                         goto error;
1255
1256                 wIndex--;
1257                 port = ports[portnum1 - 1];
1258                 temp = readl(port->addr);
1259                 if (temp == ~(u32)0) {
1260                         xhci_hc_died(xhci);
1261                         retval = -ENODEV;
1262                         break;
1263                 }
1264                 trace_xhci_get_port_status(wIndex, temp);
1265                 status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
1266                                               &flags);
1267                 if (status == 0xffffffff)
1268                         goto error;
1269
1270                 xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x",
1271                          hcd->self.busnum, portnum1, temp, status);
1272
1273                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
1274                 /* if USB 3.1 extended port status return additional 4 bytes */
1275                 if (wValue == 0x02) {
1276                         u32 port_li;
1277
1278                         if (hcd->speed < HCD_USB31 || wLength != 8) {
1279                                 xhci_err(xhci, "get ext port status invalid parameter\n");
1280                                 retval = -EINVAL;
1281                                 break;
1282                         }
1283                         port_li = readl(port->addr + PORTLI);
1284                         status = xhci_get_ext_port_status(temp, port_li);
1285                         put_unaligned_le32(status, &buf[4]);
1286                 }
1287                 break;
1288         case SetPortFeature:
1289                 if (wValue == USB_PORT_FEAT_LINK_STATE)
1290                         link_state = (wIndex & 0xff00) >> 3;
1291                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
1292                         wake_mask = wIndex & 0xff00;
1293                 if (wValue == USB_PORT_FEAT_TEST)
1294                         test_mode = (wIndex & 0xff00) >> 8;
1295                 /* The MSB of wIndex is the U1/U2 timeout */
1296                 timeout = (wIndex & 0xff00) >> 8;
1297
1298                 wIndex &= 0xff;
1299                 if (!portnum1 || portnum1 > max_ports)
1300                         goto error;
1301
1302                 port = ports[portnum1 - 1];
1303                 wIndex--;
1304                 temp = readl(port->addr);
1305                 if (temp == ~(u32)0) {
1306                         xhci_hc_died(xhci);
1307                         retval = -ENODEV;
1308                         break;
1309                 }
1310                 temp = xhci_port_state_to_neutral(temp);
1311                 /* FIXME: What new port features do we need to support? */
1312                 switch (wValue) {
1313                 case USB_PORT_FEAT_SUSPEND:
1314                         temp = readl(port->addr);
1315                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
1316                                 /* Resume the port to U0 first */
1317                                 xhci_set_link_state(xhci, port, XDEV_U0);
1318                                 spin_unlock_irqrestore(&xhci->lock, flags);
1319                                 msleep(10);
1320                                 spin_lock_irqsave(&xhci->lock, flags);
1321                         }
1322                         /* In spec software should not attempt to suspend
1323                          * a port unless the port reports that it is in the
1324                          * enabled (PED = ‘1’,PLS < ‘3’) state.
1325                          */
1326                         temp = readl(port->addr);
1327                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1328                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
1329                                 xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n",
1330                                           hcd->self.busnum, portnum1);
1331                                 goto error;
1332                         }
1333
1334                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1335                                                             portnum1);
1336                         if (!slot_id) {
1337                                 xhci_warn(xhci, "slot_id is zero\n");
1338                                 goto error;
1339                         }
1340                         /* unlock to execute stop endpoint commands */
1341                         spin_unlock_irqrestore(&xhci->lock, flags);
1342                         xhci_stop_device(xhci, slot_id, 1);
1343                         spin_lock_irqsave(&xhci->lock, flags);
1344
1345                         xhci_set_link_state(xhci, port, XDEV_U3);
1346
1347                         spin_unlock_irqrestore(&xhci->lock, flags);
1348                         msleep(10); /* wait device to enter */
1349                         spin_lock_irqsave(&xhci->lock, flags);
1350
1351                         temp = readl(port->addr);
1352                         bus_state->suspended_ports |= 1 << wIndex;
1353                         break;
1354                 case USB_PORT_FEAT_LINK_STATE:
1355                         temp = readl(port->addr);
1356                         /* Disable port */
1357                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1358                                 xhci_dbg(xhci, "Disable port %d-%d\n",
1359                                          hcd->self.busnum, portnum1);
1360                                 temp = xhci_port_state_to_neutral(temp);
1361                                 /*
1362                                  * Clear all change bits, so that we get a new
1363                                  * connection event.
1364                                  */
1365                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1366                                         PORT_OCC | PORT_RC | PORT_PLC |
1367                                         PORT_CEC;
1368                                 writel(temp | PORT_PE, port->addr);
1369                                 temp = readl(port->addr);
1370                                 break;
1371                         }
1372
1373                         /* Put link in RxDetect (enable port) */
1374                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1375                                 xhci_dbg(xhci, "Enable port %d-%d\n",
1376                                          hcd->self.busnum, portnum1);
1377                                 xhci_set_link_state(xhci, port, link_state);
1378                                 temp = readl(port->addr);
1379                                 break;
1380                         }
1381
1382                         /*
1383                          * For xHCI 1.1 according to section 4.19.1.2.4.1 a
1384                          * root hub port's transition to compliance mode upon
1385                          * detecting LFPS timeout may be controlled by an
1386                          * Compliance Transition Enabled (CTE) flag (not
1387                          * software visible). This flag is set by writing 0xA
1388                          * to PORTSC PLS field which will allow transition to
1389                          * compliance mode the next time LFPS timeout is
1390                          * encountered. A warm reset will clear it.
1391                          *
1392                          * The CTE flag is only supported if the HCCPARAMS2 CTC
1393                          * flag is set, otherwise, the compliance substate is
1394                          * automatically entered as on 1.0 and prior.
1395                          */
1396                         if (link_state == USB_SS_PORT_LS_COMP_MOD) {
1397                                 if (!HCC2_CTC(xhci->hcc_params2)) {
1398                                         xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
1399                                         break;
1400                                 }
1401
1402                                 if ((temp & PORT_CONNECT)) {
1403                                         xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
1404                                         goto error;
1405                                 }
1406
1407                                 xhci_dbg(xhci, "Enable compliance mode transition for port %d-%d\n",
1408                                          hcd->self.busnum, portnum1);
1409                                 xhci_set_link_state(xhci, port, link_state);
1410
1411                                 temp = readl(port->addr);
1412                                 break;
1413                         }
1414                         /* Port must be enabled */
1415                         if (!(temp & PORT_PE)) {
1416                                 retval = -ENODEV;
1417                                 break;
1418                         }
1419                         /* Can't set port link state above '3' (U3) */
1420                         if (link_state > USB_SS_PORT_LS_U3) {
1421                                 xhci_warn(xhci, "Cannot set port %d-%d link state %d\n",
1422                                           hcd->self.busnum, portnum1, link_state);
1423                                 goto error;
1424                         }
1425
1426                         /*
1427                          * set link to U0, steps depend on current link state.
1428                          * U3: set link to U0 and wait for u3exit completion.
1429                          * U1/U2:  no PLC complete event, only set link to U0.
1430                          * Resume/Recovery: device initiated U0, only wait for
1431                          * completion
1432                          */
1433                         if (link_state == USB_SS_PORT_LS_U0) {
1434                                 u32 pls = temp & PORT_PLS_MASK;
1435                                 bool wait_u0 = false;
1436
1437                                 /* already in U0 */
1438                                 if (pls == XDEV_U0)
1439                                         break;
1440                                 if (pls == XDEV_U3 ||
1441                                     pls == XDEV_RESUME ||
1442                                     pls == XDEV_RECOVERY) {
1443                                         wait_u0 = true;
1444                                         reinit_completion(&port->u3exit_done);
1445                                 }
1446                                 if (pls <= XDEV_U3) /* U1, U2, U3 */
1447                                         xhci_set_link_state(xhci, port, USB_SS_PORT_LS_U0);
1448                                 if (!wait_u0) {
1449                                         if (pls > XDEV_U3)
1450                                                 goto error;
1451                                         break;
1452                                 }
1453                                 spin_unlock_irqrestore(&xhci->lock, flags);
1454                                 if (!wait_for_completion_timeout(&port->u3exit_done,
1455                                                                  msecs_to_jiffies(500)))
1456                                         xhci_dbg(xhci, "missing U0 port change event for port %d-%d\n",
1457                                                  hcd->self.busnum, portnum1);
1458                                 spin_lock_irqsave(&xhci->lock, flags);
1459                                 temp = readl(port->addr);
1460                                 break;
1461                         }
1462
1463                         if (link_state == USB_SS_PORT_LS_U3) {
1464                                 int retries = 16;
1465                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1466                                                                     portnum1);
1467                                 if (slot_id) {
1468                                         /* unlock to execute stop endpoint
1469                                          * commands */
1470                                         spin_unlock_irqrestore(&xhci->lock,
1471                                                                 flags);
1472                                         xhci_stop_device(xhci, slot_id, 1);
1473                                         spin_lock_irqsave(&xhci->lock, flags);
1474                                 }
1475                                 xhci_set_link_state(xhci, port, USB_SS_PORT_LS_U3);
1476                                 spin_unlock_irqrestore(&xhci->lock, flags);
1477                                 while (retries--) {
1478                                         usleep_range(4000, 8000);
1479                                         temp = readl(port->addr);
1480                                         if ((temp & PORT_PLS_MASK) == XDEV_U3)
1481                                                 break;
1482                                 }
1483                                 spin_lock_irqsave(&xhci->lock, flags);
1484                                 temp = readl(port->addr);
1485                                 bus_state->suspended_ports |= 1 << wIndex;
1486                         }
1487                         break;
1488                 case USB_PORT_FEAT_POWER:
1489                         /*
1490                          * Turn on ports, even if there isn't per-port switching.
1491                          * HC will report connect events even before this is set.
1492                          * However, hub_wq will ignore the roothub events until
1493                          * the roothub is registered.
1494                          */
1495                         xhci_set_port_power(xhci, port, true, &flags);
1496                         break;
1497                 case USB_PORT_FEAT_RESET:
1498                         temp = (temp | PORT_RESET);
1499                         writel(temp, port->addr);
1500
1501                         temp = readl(port->addr);
1502                         xhci_dbg(xhci, "set port reset, actual port %d-%d status  = 0x%x\n",
1503                                  hcd->self.busnum, portnum1, temp);
1504                         break;
1505                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1506                         xhci_set_remote_wake_mask(xhci, port, wake_mask);
1507                         temp = readl(port->addr);
1508                         xhci_dbg(xhci, "set port remote wake mask, actual port %d-%d status  = 0x%x\n",
1509                                  hcd->self.busnum, portnum1, temp);
1510                         break;
1511                 case USB_PORT_FEAT_BH_PORT_RESET:
1512                         temp |= PORT_WR;
1513                         writel(temp, port->addr);
1514                         temp = readl(port->addr);
1515                         break;
1516                 case USB_PORT_FEAT_U1_TIMEOUT:
1517                         if (hcd->speed < HCD_USB3)
1518                                 goto error;
1519                         temp = readl(port->addr + PORTPMSC);
1520                         temp &= ~PORT_U1_TIMEOUT_MASK;
1521                         temp |= PORT_U1_TIMEOUT(timeout);
1522                         writel(temp, port->addr + PORTPMSC);
1523                         break;
1524                 case USB_PORT_FEAT_U2_TIMEOUT:
1525                         if (hcd->speed < HCD_USB3)
1526                                 goto error;
1527                         temp = readl(port->addr + PORTPMSC);
1528                         temp &= ~PORT_U2_TIMEOUT_MASK;
1529                         temp |= PORT_U2_TIMEOUT(timeout);
1530                         writel(temp, port->addr + PORTPMSC);
1531                         break;
1532                 case USB_PORT_FEAT_TEST:
1533                         /* 4.19.6 Port Test Modes (USB2 Test Mode) */
1534                         if (hcd->speed != HCD_USB2)
1535                                 goto error;
1536                         if (test_mode > USB_TEST_FORCE_ENABLE ||
1537                             test_mode < USB_TEST_J)
1538                                 goto error;
1539                         retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
1540                                                       &flags);
1541                         break;
1542                 default:
1543                         goto error;
1544                 }
1545                 /* unblock any posted writes */
1546                 temp = readl(port->addr);
1547                 break;
1548         case ClearPortFeature:
1549                 if (!portnum1 || portnum1 > max_ports)
1550                         goto error;
1551
1552                 port = ports[portnum1 - 1];
1553
1554                 wIndex--;
1555                 temp = readl(port->addr);
1556                 if (temp == ~(u32)0) {
1557                         xhci_hc_died(xhci);
1558                         retval = -ENODEV;
1559                         break;
1560                 }
1561                 /* FIXME: What new port features do we need to support? */
1562                 temp = xhci_port_state_to_neutral(temp);
1563                 switch (wValue) {
1564                 case USB_PORT_FEAT_SUSPEND:
1565                         temp = readl(port->addr);
1566                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1567                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1568                         if (temp & PORT_RESET)
1569                                 goto error;
1570                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1571                                 if ((temp & PORT_PE) == 0)
1572                                         goto error;
1573
1574                                 set_bit(wIndex, &bus_state->resuming_ports);
1575                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1576                                 xhci_set_link_state(xhci, port, XDEV_RESUME);
1577                                 spin_unlock_irqrestore(&xhci->lock, flags);
1578                                 msleep(USB_RESUME_TIMEOUT);
1579                                 spin_lock_irqsave(&xhci->lock, flags);
1580                                 xhci_set_link_state(xhci, port, XDEV_U0);
1581                                 clear_bit(wIndex, &bus_state->resuming_ports);
1582                                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1583                         }
1584                         bus_state->port_c_suspend |= 1 << wIndex;
1585
1586                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1587                                         portnum1);
1588                         if (!slot_id) {
1589                                 xhci_dbg(xhci, "slot_id is zero\n");
1590                                 goto error;
1591                         }
1592                         xhci_ring_device(xhci, slot_id);
1593                         break;
1594                 case USB_PORT_FEAT_C_SUSPEND:
1595                         bus_state->port_c_suspend &= ~(1 << wIndex);
1596                         fallthrough;
1597                 case USB_PORT_FEAT_C_RESET:
1598                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1599                 case USB_PORT_FEAT_C_CONNECTION:
1600                 case USB_PORT_FEAT_C_OVER_CURRENT:
1601                 case USB_PORT_FEAT_C_ENABLE:
1602                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1603                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1604                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1605                                         port->addr, temp);
1606                         break;
1607                 case USB_PORT_FEAT_ENABLE:
1608                         xhci_disable_port(xhci, port);
1609                         break;
1610                 case USB_PORT_FEAT_POWER:
1611                         xhci_set_port_power(xhci, port, false, &flags);
1612                         break;
1613                 case USB_PORT_FEAT_TEST:
1614                         retval = xhci_exit_test_mode(xhci);
1615                         break;
1616                 default:
1617                         goto error;
1618                 }
1619                 break;
1620         default:
1621 error:
1622                 /* "stall" on error */
1623                 retval = -EPIPE;
1624         }
1625         spin_unlock_irqrestore(&xhci->lock, flags);
1626         return retval;
1627 }
1628 EXPORT_SYMBOL_GPL(xhci_hub_control);
1629
1630 /*
1631  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1632  * Ports are 0-indexed from the HCD point of view,
1633  * and 1-indexed from the USB core pointer of view.
1634  *
1635  * Note that the status change bits will be cleared as soon as a port status
1636  * change event is generated, so we use the saved status from that event.
1637  */
1638 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1639 {
1640         unsigned long flags;
1641         u32 temp, status;
1642         u32 mask;
1643         int i, retval;
1644         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1645         int max_ports;
1646         struct xhci_bus_state *bus_state;
1647         bool reset_change = false;
1648         struct xhci_hub *rhub;
1649         struct xhci_port **ports;
1650
1651         rhub = xhci_get_rhub(hcd);
1652         ports = rhub->ports;
1653         max_ports = rhub->num_ports;
1654         bus_state = &rhub->bus_state;
1655
1656         /* Initial status is no changes */
1657         retval = (max_ports + 8) / 8;
1658         memset(buf, 0, retval);
1659
1660         /*
1661          * Inform the usbcore about resume-in-progress by returning
1662          * a non-zero value even if there are no status changes.
1663          */
1664         spin_lock_irqsave(&xhci->lock, flags);
1665
1666         status = bus_state->resuming_ports;
1667
1668         /*
1669          * SS devices are only visible to roothub after link training completes.
1670          * Keep polling roothubs for a grace period after xHC start
1671          */
1672         if (xhci->run_graceperiod) {
1673                 if (time_before(jiffies, xhci->run_graceperiod))
1674                         status = 1;
1675                 else
1676                         xhci->run_graceperiod = 0;
1677         }
1678
1679         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1680
1681         /* For each port, did anything change?  If so, set that bit in buf. */
1682         for (i = 0; i < max_ports; i++) {
1683                 temp = readl(ports[i]->addr);
1684                 if (temp == ~(u32)0) {
1685                         xhci_hc_died(xhci);
1686                         retval = -ENODEV;
1687                         break;
1688                 }
1689                 trace_xhci_hub_status_data(i, temp);
1690
1691                 if ((temp & mask) != 0 ||
1692                         (bus_state->port_c_suspend & 1 << i) ||
1693                         (ports[i]->resume_timestamp && time_after_eq(
1694                             jiffies, ports[i]->resume_timestamp))) {
1695                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1696                         status = 1;
1697                 }
1698                 if ((temp & PORT_RC))
1699                         reset_change = true;
1700                 if (temp & PORT_OC)
1701                         status = 1;
1702         }
1703         if (!status && !reset_change) {
1704                 xhci_dbg(xhci, "%s: stopping usb%d port polling\n",
1705                          __func__, hcd->self.busnum);
1706                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1707         }
1708         spin_unlock_irqrestore(&xhci->lock, flags);
1709         return status ? retval : 0;
1710 }
1711
1712 #ifdef CONFIG_PM
1713
1714 int xhci_bus_suspend(struct usb_hcd *hcd)
1715 {
1716         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1717         int max_ports, port_index;
1718         struct xhci_bus_state *bus_state;
1719         unsigned long flags;
1720         struct xhci_hub *rhub;
1721         struct xhci_port **ports;
1722         u32 portsc_buf[USB_MAXCHILDREN];
1723         bool wake_enabled;
1724
1725         rhub = xhci_get_rhub(hcd);
1726         ports = rhub->ports;
1727         max_ports = rhub->num_ports;
1728         bus_state = &rhub->bus_state;
1729         wake_enabled = hcd->self.root_hub->do_remote_wakeup;
1730
1731         spin_lock_irqsave(&xhci->lock, flags);
1732
1733         if (wake_enabled) {
1734                 if (bus_state->resuming_ports ||        /* USB2 */
1735                     bus_state->port_remote_wakeup) {    /* USB3 */
1736                         spin_unlock_irqrestore(&xhci->lock, flags);
1737                         xhci_dbg(xhci, "usb%d bus suspend to fail because a port is resuming\n",
1738                                  hcd->self.busnum);
1739                         return -EBUSY;
1740                 }
1741         }
1742         /*
1743          * Prepare ports for suspend, but don't write anything before all ports
1744          * are checked and we know bus suspend can proceed
1745          */
1746         bus_state->bus_suspended = 0;
1747         port_index = max_ports;
1748         while (port_index--) {
1749                 u32 t1, t2;
1750                 int retries = 10;
1751 retry:
1752                 t1 = readl(ports[port_index]->addr);
1753                 t2 = xhci_port_state_to_neutral(t1);
1754                 portsc_buf[port_index] = 0;
1755
1756                 /*
1757                  * Give a USB3 port in link training time to finish, but don't
1758                  * prevent suspend as port might be stuck
1759                  */
1760                 if ((hcd->speed >= HCD_USB3) && retries-- &&
1761                     (t1 & PORT_PLS_MASK) == XDEV_POLLING) {
1762                         spin_unlock_irqrestore(&xhci->lock, flags);
1763                         msleep(XHCI_PORT_POLLING_LFPS_TIME);
1764                         spin_lock_irqsave(&xhci->lock, flags);
1765                         xhci_dbg(xhci, "port %d-%d polling in bus suspend, waiting\n",
1766                                  hcd->self.busnum, port_index + 1);
1767                         goto retry;
1768                 }
1769                 /* bail out if port detected a over-current condition */
1770                 if (t1 & PORT_OC) {
1771                         bus_state->bus_suspended = 0;
1772                         spin_unlock_irqrestore(&xhci->lock, flags);
1773                         xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n");
1774                         return -EBUSY;
1775                 }
1776                 /* suspend ports in U0, or bail out for new connect changes */
1777                 if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
1778                         if ((t1 & PORT_CSC) && wake_enabled) {
1779                                 bus_state->bus_suspended = 0;
1780                                 spin_unlock_irqrestore(&xhci->lock, flags);
1781                                 xhci_dbg(xhci, "Bus suspend bailout, port connect change\n");
1782                                 return -EBUSY;
1783                         }
1784                         xhci_dbg(xhci, "port %d-%d not suspended\n",
1785                                  hcd->self.busnum, port_index + 1);
1786                         t2 &= ~PORT_PLS_MASK;
1787                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1788                         set_bit(port_index, &bus_state->bus_suspended);
1789                 }
1790                 /* USB core sets remote wake mask for USB 3.0 hubs,
1791                  * including the USB 3.0 roothub, but only if CONFIG_PM
1792                  * is enabled, so also enable remote wake here.
1793                  */
1794                 if (wake_enabled) {
1795                         if (t1 & PORT_CONNECT) {
1796                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1797                                 t2 &= ~PORT_WKCONN_E;
1798                         } else {
1799                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1800                                 t2 &= ~PORT_WKDISC_E;
1801                         }
1802
1803                         if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
1804                             (hcd->speed < HCD_USB3)) {
1805                                 if (usb_amd_pt_check_port(hcd->self.controller,
1806                                                           port_index))
1807                                         t2 &= ~PORT_WAKE_BITS;
1808                         }
1809                 } else
1810                         t2 &= ~PORT_WAKE_BITS;
1811
1812                 t1 = xhci_port_state_to_neutral(t1);
1813                 if (t1 != t2)
1814                         portsc_buf[port_index] = t2;
1815         }
1816
1817         /* write port settings, stopping and suspending ports if needed */
1818         port_index = max_ports;
1819         while (port_index--) {
1820                 if (!portsc_buf[port_index])
1821                         continue;
1822                 if (test_bit(port_index, &bus_state->bus_suspended)) {
1823                         int slot_id;
1824
1825                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1826                                                             port_index + 1);
1827                         if (slot_id) {
1828                                 spin_unlock_irqrestore(&xhci->lock, flags);
1829                                 xhci_stop_device(xhci, slot_id, 1);
1830                                 spin_lock_irqsave(&xhci->lock, flags);
1831                         }
1832                 }
1833                 writel(portsc_buf[port_index], ports[port_index]->addr);
1834         }
1835         hcd->state = HC_STATE_SUSPENDED;
1836         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1837         spin_unlock_irqrestore(&xhci->lock, flags);
1838
1839         if (bus_state->bus_suspended)
1840                 usleep_range(5000, 10000);
1841
1842         return 0;
1843 }
1844
1845 /*
1846  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1847  * warm reset a USB3 device stuck in polling or compliance mode after resume.
1848  * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1849  */
1850 static bool xhci_port_missing_cas_quirk(struct xhci_port *port)
1851 {
1852         u32 portsc;
1853
1854         portsc = readl(port->addr);
1855
1856         /* if any of these are set we are not stuck */
1857         if (portsc & (PORT_CONNECT | PORT_CAS))
1858                 return false;
1859
1860         if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1861             ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1862                 return false;
1863
1864         /* clear wakeup/change bits, and do a warm port reset */
1865         portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1866         portsc |= PORT_WR;
1867         writel(portsc, port->addr);
1868         /* flush write */
1869         readl(port->addr);
1870         return true;
1871 }
1872
1873 int xhci_bus_resume(struct usb_hcd *hcd)
1874 {
1875         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1876         struct xhci_bus_state *bus_state;
1877         unsigned long flags;
1878         int max_ports, port_index;
1879         int slot_id;
1880         int sret;
1881         u32 next_state;
1882         u32 temp, portsc;
1883         struct xhci_hub *rhub;
1884         struct xhci_port **ports;
1885
1886         rhub = xhci_get_rhub(hcd);
1887         ports = rhub->ports;
1888         max_ports = rhub->num_ports;
1889         bus_state = &rhub->bus_state;
1890
1891         if (time_before(jiffies, bus_state->next_statechange))
1892                 msleep(5);
1893
1894         spin_lock_irqsave(&xhci->lock, flags);
1895         if (!HCD_HW_ACCESSIBLE(hcd)) {
1896                 spin_unlock_irqrestore(&xhci->lock, flags);
1897                 return -ESHUTDOWN;
1898         }
1899
1900         /* delay the irqs */
1901         temp = readl(&xhci->op_regs->command);
1902         temp &= ~CMD_EIE;
1903         writel(temp, &xhci->op_regs->command);
1904
1905         /* bus specific resume for ports we suspended at bus_suspend */
1906         if (hcd->speed >= HCD_USB3)
1907                 next_state = XDEV_U0;
1908         else
1909                 next_state = XDEV_RESUME;
1910
1911         port_index = max_ports;
1912         while (port_index--) {
1913                 portsc = readl(ports[port_index]->addr);
1914
1915                 /* warm reset CAS limited ports stuck in polling/compliance */
1916                 if ((xhci->quirks & XHCI_MISSING_CAS) &&
1917                     (hcd->speed >= HCD_USB3) &&
1918                     xhci_port_missing_cas_quirk(ports[port_index])) {
1919                         xhci_dbg(xhci, "reset stuck port %d-%d\n",
1920                                  hcd->self.busnum, port_index + 1);
1921                         clear_bit(port_index, &bus_state->bus_suspended);
1922                         continue;
1923                 }
1924                 /* resume if we suspended the link, and it is still suspended */
1925                 if (test_bit(port_index, &bus_state->bus_suspended))
1926                         switch (portsc & PORT_PLS_MASK) {
1927                         case XDEV_U3:
1928                                 portsc = xhci_port_state_to_neutral(portsc);
1929                                 portsc &= ~PORT_PLS_MASK;
1930                                 portsc |= PORT_LINK_STROBE | next_state;
1931                                 break;
1932                         case XDEV_RESUME:
1933                                 /* resume already initiated */
1934                                 break;
1935                         default:
1936                                 /* not in a resumeable state, ignore it */
1937                                 clear_bit(port_index,
1938                                           &bus_state->bus_suspended);
1939                                 break;
1940                         }
1941                 /* disable wake for all ports, write new link state if needed */
1942                 portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1943                 writel(portsc, ports[port_index]->addr);
1944         }
1945
1946         /* USB2 specific resume signaling delay and U0 link state transition */
1947         if (hcd->speed < HCD_USB3) {
1948                 if (bus_state->bus_suspended) {
1949                         spin_unlock_irqrestore(&xhci->lock, flags);
1950                         msleep(USB_RESUME_TIMEOUT);
1951                         spin_lock_irqsave(&xhci->lock, flags);
1952                 }
1953                 for_each_set_bit(port_index, &bus_state->bus_suspended,
1954                                  BITS_PER_LONG) {
1955                         /* Clear PLC to poll it later for U0 transition */
1956                         xhci_test_and_clear_bit(xhci, ports[port_index],
1957                                                 PORT_PLC);
1958                         xhci_set_link_state(xhci, ports[port_index], XDEV_U0);
1959                 }
1960         }
1961
1962         /* poll for U0 link state complete, both USB2 and USB3 */
1963         for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) {
1964                 sret = xhci_handshake(ports[port_index]->addr, PORT_PLC,
1965                                       PORT_PLC, 10 * 1000);
1966                 if (sret) {
1967                         xhci_warn(xhci, "port %d-%d resume PLC timeout\n",
1968                                   hcd->self.busnum, port_index + 1);
1969                         continue;
1970                 }
1971                 xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC);
1972                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1973                 if (slot_id)
1974                         xhci_ring_device(xhci, slot_id);
1975         }
1976         (void) readl(&xhci->op_regs->command);
1977
1978         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1979         /* re-enable irqs */
1980         temp = readl(&xhci->op_regs->command);
1981         temp |= CMD_EIE;
1982         writel(temp, &xhci->op_regs->command);
1983         temp = readl(&xhci->op_regs->command);
1984
1985         spin_unlock_irqrestore(&xhci->lock, flags);
1986         return 0;
1987 }
1988
1989 unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
1990 {
1991         struct xhci_hub *rhub = xhci_get_rhub(hcd);
1992
1993         /* USB3 port wakeups are reported via usb_wakeup_notification() */
1994         return rhub->bus_state.resuming_ports;  /* USB2 ports only */
1995 }
1996
1997 #endif  /* CONFIG_PM */