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
  15 #include "xhci.h"
  16 #include "xhci-trace.h"
  17
  18 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  19 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  20                          PORT_RC | PORT_PLC | PORT_PE)
  21
  22 /* USB 3 BOS descriptor and a capability descriptors, combined.
  23  * Fields will be adjusted and added later in xhci_create_usb3_bos_desc()
  24  */
  25 static u8 usb_bos_descriptor [] = {
  26         USB_DT_BOS_SIZE,                /*  __u8 bLength, 5 bytes */
  27         USB_DT_BOS,                     /*  __u8 bDescriptorType */
  28         0x0F, 0x00,                     /*  __le16 wTotalLength, 15 bytes */
  29         0x1,                            /*  __u8 bNumDeviceCaps */
  30         /* First device capability, SuperSpeed */
  31         USB_DT_USB_SS_CAP_SIZE,         /*  __u8 bLength, 10 bytes */
  32         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
  33         USB_SS_CAP_TYPE,                /* bDevCapabilityType, SUPERSPEED_USB */
  34         0x00,                           /* bmAttributes, LTM off by default */
  35         USB_5GBPS_OPERATION, 0x00,      /* wSpeedsSupported, 5Gbps only */
  36         0x03,                           /* bFunctionalitySupport,
  37                                            USB 3.0 speed only */
  38         0x00,                           /* bU1DevExitLat, set later. */
  39         0x00, 0x00,                     /* __le16 bU2DevExitLat, set later. */
  40         /* Second device capability, SuperSpeedPlus */
  41         0x1c,                           /* bLength 28, will be adjusted later */
  42         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
  43         USB_SSP_CAP_TYPE,               /* bDevCapabilityType SUPERSPEED_PLUS */
  44         0x00,                           /* bReserved 0 */
  45         0x23, 0x00, 0x00, 0x00,         /* bmAttributes, SSAC=3 SSIC=1 */
  46         0x01, 0x00,                     /* wFunctionalitySupport */
  47         0x00, 0x00,                     /* wReserved 0 */
  48         /* Default Sublink Speed Attributes, overwrite if custom PSI exists */
  49         0x34, 0x00, 0x05, 0x00,         /* 5Gbps, symmetric, rx, ID = 4 */
  50         0xb4, 0x00, 0x05, 0x00,         /* 5Gbps, symmetric, tx, ID = 4 */
  51         0x35, 0x40, 0x0a, 0x00,         /* 10Gbps, SSP, symmetric, rx, ID = 5 */
  52         0xb5, 0x40, 0x0a, 0x00,         /* 10Gbps, SSP, symmetric, tx, ID = 5 */
  53 };
  54
  55 static int xhci_create_usb3_bos_desc(struct xhci_hcd *xhci, char *buf,
  56                                      u16 wLength)
  57 {
  58         int i, ssa_count;
  59         u32 temp;
  60         u16 desc_size, ssp_cap_size, ssa_size = 0;
  61         bool usb3_1 = false;
  62
  63         desc_size = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
  64         ssp_cap_size = sizeof(usb_bos_descriptor) - desc_size;
  65
  66         /* does xhci support USB 3.1 Enhanced SuperSpeed */
  67         if (xhci->usb3_rhub.min_rev >= 0x01) {
  68                 /* does xhci provide a PSI table for SSA speed attributes? */
  69                 if (xhci->usb3_rhub.psi_count) {
  70                         /* two SSA entries for each unique PSI ID, RX and TX */
  71                         ssa_count = xhci->usb3_rhub.psi_uid_count * 2;
  72                         ssa_size = ssa_count * sizeof(u32);
  73                         ssp_cap_size -= 16; /* skip copying the default SSA */
  74                 }
  75                 desc_size += ssp_cap_size;
  76                 usb3_1 = true;
  77         }
  78         memcpy(buf, &usb_bos_descriptor, min(desc_size, wLength));
  79
  80         if (usb3_1) {
  81                 /* modify bos descriptor bNumDeviceCaps and wTotalLength */
  82                 buf[4] += 1;
  83                 put_unaligned_le16(desc_size + ssa_size, &buf[2]);
  84         }
  85
  86         if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
  87                 return wLength;
  88
  89         /* Indicate whether the host has LTM support. */
  90         temp = readl(&xhci->cap_regs->hcc_params);
  91         if (HCC_LTC(temp))
  92                 buf[8] |= USB_LTM_SUPPORT;
  93
  94         /* Set the U1 and U2 exit latencies. */
  95         if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
  96                 temp = readl(&xhci->cap_regs->hcs_params3);
  97                 buf[12] = HCS_U1_LATENCY(temp);
  98                 put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]);
  99         }
 100
 101         /* If PSI table exists, add the custom speed attributes from it */
 102         if (usb3_1 && xhci->usb3_rhub.psi_count) {
 103                 u32 ssp_cap_base, bm_attrib, psi, psi_mant, psi_exp;
 104                 int offset;
 105
 106                 ssp_cap_base = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
 107
 108                 if (wLength < desc_size)
 109                         return wLength;
 110                 buf[ssp_cap_base] = ssp_cap_size + ssa_size;
 111
 112                 /* attribute count SSAC bits 4:0 and ID count SSIC bits 8:5 */
 113                 bm_attrib = (ssa_count - 1) & 0x1f;
 114                 bm_attrib |= (xhci->usb3_rhub.psi_uid_count - 1) << 5;
 115                 put_unaligned_le32(bm_attrib, &buf[ssp_cap_base + 4]);
 116
 117                 if (wLength < desc_size + ssa_size)
 118                         return wLength;
 119                 /*
 120                  * Create the Sublink Speed Attributes (SSA) array.
 121                  * The xhci PSI field and USB 3.1 SSA fields are very similar,
 122                  * but link type bits 7:6 differ for values 01b and 10b.
 123                  * xhci has also only one PSI entry for a symmetric link when
 124                  * USB 3.1 requires two SSA entries (RX and TX) for every link
 125                  */
 126                 offset = desc_size;
 127                 for (i = 0; i < xhci->usb3_rhub.psi_count; i++) {
 128                         psi = xhci->usb3_rhub.psi[i];
 129                         psi &= ~USB_SSP_SUBLINK_SPEED_RSVD;
 130                         psi_exp = XHCI_EXT_PORT_PSIE(psi);
 131                         psi_mant = XHCI_EXT_PORT_PSIM(psi);
 132
 133                         /* Shift to Gbps and set SSP Link BIT(14) if 10Gpbs */
 134                         for (; psi_exp < 3; psi_exp++)
 135                                 psi_mant /= 1000;
 136                         if (psi_mant >= 10)
 137                                 psi |= BIT(14);
 138
 139                         if ((psi & PLT_MASK) == PLT_SYM) {
 140                         /* Symmetric, create SSA RX and TX from one PSI entry */
 141                                 put_unaligned_le32(psi, &buf[offset]);
 142                                 psi |= 1 << 7;  /* turn entry to TX */
 143                                 offset += 4;
 144                                 if (offset >= desc_size + ssa_size)
 145                                         return desc_size + ssa_size;
 146                         } else if ((psi & PLT_MASK) == PLT_ASYM_RX) {
 147                                 /* Asymetric RX, flip bits 7:6 for SSA */
 148                                 psi ^= PLT_MASK;
 149                         }
 150                         put_unaligned_le32(psi, &buf[offset]);
 151                         offset += 4;
 152                         if (offset >= desc_size + ssa_size)
 153                                 return desc_size + ssa_size;
 154                 }
 155         }
 156         /* ssa_size is 0 for other than usb 3.1 hosts */
 157         return desc_size + ssa_size;
 158 }
 159
 160 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 161                 struct usb_hub_descriptor *desc, int ports)
 162 {
 163         u16 temp;
 164
 165         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
 166         desc->bHubContrCurrent = 0;
 167
 168         desc->bNbrPorts = ports;
 169         temp = 0;
 170         /* Bits 1:0 - support per-port power switching, or power always on */
 171         if (HCC_PPC(xhci->hcc_params))
 172                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 173         else
 174                 temp |= HUB_CHAR_NO_LPSM;
 175         /* Bit  2 - root hubs are not part of a compound device */
 176         /* Bits 4:3 - individual port over current protection */
 177         temp |= HUB_CHAR_INDV_PORT_OCPM;
 178         /* Bits 6:5 - no TTs in root ports */
 179         /* Bit  7 - no port indicators */
 180         desc->wHubCharacteristics = cpu_to_le16(temp);
 181 }
 182
 183 /* Fill in the USB 2.0 roothub descriptor */
 184 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 185                 struct usb_hub_descriptor *desc)
 186 {
 187         int ports;
 188         u16 temp;
 189         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
 190         u32 portsc;
 191         unsigned int i;
 192         struct xhci_hub *rhub;
 193
 194         rhub = &xhci->usb2_rhub;
 195         ports = rhub->num_ports;
 196         xhci_common_hub_descriptor(xhci, desc, ports);
 197         desc->bDescriptorType = USB_DT_HUB;
 198         temp = 1 + (ports / 8);
 199         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
 200
 201         /* The Device Removable bits are reported on a byte granularity.
 202          * If the port doesn't exist within that byte, the bit is set to 0.
 203          */
 204         memset(port_removable, 0, sizeof(port_removable));
 205         for (i = 0; i < ports; i++) {
 206                 portsc = readl(rhub->ports[i]->addr);
 207                 /* If a device is removable, PORTSC reports a 0, same as in the
 208                  * hub descriptor DeviceRemovable bits.
 209                  */
 210                 if (portsc & PORT_DEV_REMOVE)
 211                         /* This math is hairy because bit 0 of DeviceRemovable
 212                          * is reserved, and bit 1 is for port 1, etc.
 213                          */
 214                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
 215         }
 216
 217         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
 218          * ports on it.  The USB 2.0 specification says that there are two
 219          * variable length fields at the end of the hub descriptor:
 220          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
 221          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
 222          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
 223          * 0xFF, so we initialize the both arrays (DeviceRemovable and
 224          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
 225          * set of ports that actually exist.
 226          */
 227         memset(desc->u.hs.DeviceRemovable, 0xff,
 228                         sizeof(desc->u.hs.DeviceRemovable));
 229         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 230                         sizeof(desc->u.hs.PortPwrCtrlMask));
 231
 232         for (i = 0; i < (ports + 1 + 7) / 8; i++)
 233                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 234                                 sizeof(__u8));
 235 }
 236
 237 /* Fill in the USB 3.0 roothub descriptor */
 238 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 239                 struct usb_hub_descriptor *desc)
 240 {
 241         int ports;
 242         u16 port_removable;
 243         u32 portsc;
 244         unsigned int i;
 245         struct xhci_hub *rhub;
 246
 247         rhub = &xhci->usb3_rhub;
 248         ports = rhub->num_ports;
 249         xhci_common_hub_descriptor(xhci, desc, ports);
 250         desc->bDescriptorType = USB_DT_SS_HUB;
 251         desc->bDescLength = USB_DT_SS_HUB_SIZE;
 252
 253         /* header decode latency should be zero for roothubs,
 254          * see section 4.23.5.2.
 255          */
 256         desc->u.ss.bHubHdrDecLat = 0;
 257         desc->u.ss.wHubDelay = 0;
 258
 259         port_removable = 0;
 260         /* bit 0 is reserved, bit 1 is for port 1, etc. */
 261         for (i = 0; i < ports; i++) {
 262                 portsc = readl(rhub->ports[i]->addr);
 263                 if (portsc & PORT_DEV_REMOVE)
 264                         port_removable |= 1 << (i + 1);
 265         }
 266
 267         desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
 268 }
 269
 270 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 271                 struct usb_hub_descriptor *desc)
 272 {
 273
 274         if (hcd->speed >= HCD_USB3)
 275                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
 276         else
 277                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
 278
 279 }
 280
 281 static unsigned int xhci_port_speed(unsigned int port_status)
 282 {
 283         if (DEV_LOWSPEED(port_status))
 284                 return USB_PORT_STAT_LOW_SPEED;
 285         if (DEV_HIGHSPEED(port_status))
 286                 return USB_PORT_STAT_HIGH_SPEED;
 287         /*
 288          * FIXME: Yes, we should check for full speed, but the core uses that as
 289          * a default in portspeed() in usb/core/hub.c (which is the only place
 290          * USB_PORT_STAT_*_SPEED is used).
 291          */
 292         return 0;
 293 }
 294
 295 /*
 296  * These bits are Read Only (RO) and should be saved and written to the
 297  * registers: 0, 3, 10:13, 30
 298  * connect status, over-current status, port speed, and device removable.
 299  * connect status and port speed are also sticky - meaning they're in
 300  * the AUX well and they aren't changed by a hot, warm, or cold reset.
 301  */
 302 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 303 /*
 304  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 305  * bits 5:8, 9, 14:15, 25:27
 306  * link state, port power, port indicator state, "wake on" enable state
 307  */
 308 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 309 /*
 310  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 311  * bit 4 (port reset)
 312  */
 313 #define XHCI_PORT_RW1S  ((1<<4))
 314 /*
 315  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 316  * bits 1, 17, 18, 19, 20, 21, 22, 23
 317  * port enable/disable, and
 318  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 319  * over-current, reset, link state, and L1 change
 320  */
 321 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
 322 /*
 323  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 324  * latched in
 325  */
 326 #define XHCI_PORT_RW    ((1<<16))
 327 /*
 328  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 329  * bits 2, 24, 28:31
 330  */
 331 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
 332
 333 /*
 334  * Given a port state, this function returns a value that would result in the
 335  * port being in the same state, if the value was written to the port status
 336  * control register.
 337  * Save Read Only (RO) bits and save read/write bits where
 338  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 339  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 340  */
 341 u32 xhci_port_state_to_neutral(u32 state)
 342 {
 343         /* Save read-only status and port state */
 344         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 345 }
 346
 347 /*
 348  * find slot id based on port number.
 349  * @port: The one-based port number from one of the two split roothubs.
 350  */
 351 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 352                 u16 port)
 353 {
 354         int slot_id;
 355         int i;
 356         enum usb_device_speed speed;
 357
 358         slot_id = 0;
 359         for (i = 0; i < MAX_HC_SLOTS; i++) {
 360                 if (!xhci->devs[i] || !xhci->devs[i]->udev)
 361                         continue;
 362                 speed = xhci->devs[i]->udev->speed;
 363                 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
 364                                 && xhci->devs[i]->fake_port == port) {
 365                         slot_id = i;
 366                         break;
 367                 }
 368         }
 369
 370         return slot_id;
 371 }
 372
 373 /*
 374  * Stop device
 375  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 376  * to complete.
 377  * suspend will set to 1, if suspend bit need to set in command.
 378  */
 379 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 380 {
 381         struct xhci_virt_device *virt_dev;
 382         struct xhci_command *cmd;
 383         unsigned long flags;
 384         int ret;
 385         int i;
 386
 387         ret = 0;
 388         virt_dev = xhci->devs[slot_id];
 389         if (!virt_dev)
 390                 return -ENODEV;
 391
 392         trace_xhci_stop_device(virt_dev);
 393
 394         cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
 395         if (!cmd)
 396                 return -ENOMEM;
 397
 398         spin_lock_irqsave(&xhci->lock, flags);
 399         for (i = LAST_EP_INDEX; i > 0; i--) {
 400                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 401                         struct xhci_ep_ctx *ep_ctx;
 402                         struct xhci_command *command;
 403
 404                         ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i);
 405
 406                         /* Check ep is running, required by AMD SNPS 3.1 xHC */
 407                         if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING)
 408                                 continue;
 409
 410                         command = xhci_alloc_command(xhci, false, GFP_NOWAIT);
 411                         if (!command) {
 412                                 spin_unlock_irqrestore(&xhci->lock, flags);
 413                                 ret = -ENOMEM;
 414                                 goto cmd_cleanup;
 415                         }
 416
 417                         ret = xhci_queue_stop_endpoint(xhci, command, slot_id,
 418                                                        i, suspend);
 419                         if (ret) {
 420                                 spin_unlock_irqrestore(&xhci->lock, flags);
 421                                 xhci_free_command(xhci, command);
 422                                 goto cmd_cleanup;
 423                         }
 424                 }
 425         }
 426         ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 427         if (ret) {
 428                 spin_unlock_irqrestore(&xhci->lock, flags);
 429                 goto cmd_cleanup;
 430         }
 431
 432         xhci_ring_cmd_db(xhci);
 433         spin_unlock_irqrestore(&xhci->lock, flags);
 434
 435         /* Wait for last stop endpoint command to finish */
 436         wait_for_completion(cmd->completion);
 437
 438         if (cmd->status == COMP_COMMAND_ABORTED ||
 439             cmd->status == COMP_COMMAND_RING_STOPPED) {
 440                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 441                 ret = -ETIME;
 442         }
 443
 444 cmd_cleanup:
 445         xhci_free_command(xhci, cmd);
 446         return ret;
 447 }
 448
 449 /*
 450  * Ring device, it rings the all doorbells unconditionally.
 451  */
 452 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 453 {
 454         int i, s;
 455         struct xhci_virt_ep *ep;
 456
 457         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 458                 ep = &xhci->devs[slot_id]->eps[i];
 459
 460                 if (ep->ep_state & EP_HAS_STREAMS) {
 461                         for (s = 1; s < ep->stream_info->num_streams; s++)
 462                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 463                 } else if (ep->ring && ep->ring->dequeue) {
 464                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 465                 }
 466         }
 467
 468         return;
 469 }
 470
 471 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 472                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 473 {
 474         /* Don't allow the USB core to disable SuperSpeed ports. */
 475         if (hcd->speed >= HCD_USB3) {
 476                 xhci_dbg(xhci, "Ignoring request to disable "
 477                                 "SuperSpeed port.\n");
 478                 return;
 479         }
 480
 481         if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
 482                 xhci_dbg(xhci,
 483                          "Broken Port Enabled/Disabled, ignoring port disable request.\n");
 484                 return;
 485         }
 486
 487         /* Write 1 to disable the port */
 488         writel(port_status | PORT_PE, addr);
 489         port_status = readl(addr);
 490         xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n",
 491                  hcd->self.busnum, wIndex + 1, port_status);
 492 }
 493
 494 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 495                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 496 {
 497         char *port_change_bit;
 498         u32 status;
 499
 500         switch (wValue) {
 501         case USB_PORT_FEAT_C_RESET:
 502                 status = PORT_RC;
 503                 port_change_bit = "reset";
 504                 break;
 505         case USB_PORT_FEAT_C_BH_PORT_RESET:
 506                 status = PORT_WRC;
 507                 port_change_bit = "warm(BH) reset";
 508                 break;
 509         case USB_PORT_FEAT_C_CONNECTION:
 510                 status = PORT_CSC;
 511                 port_change_bit = "connect";
 512                 break;
 513         case USB_PORT_FEAT_C_OVER_CURRENT:
 514                 status = PORT_OCC;
 515                 port_change_bit = "over-current";
 516                 break;
 517         case USB_PORT_FEAT_C_ENABLE:
 518                 status = PORT_PEC;
 519                 port_change_bit = "enable/disable";
 520                 break;
 521         case USB_PORT_FEAT_C_SUSPEND:
 522                 status = PORT_PLC;
 523                 port_change_bit = "suspend/resume";
 524                 break;
 525         case USB_PORT_FEAT_C_PORT_LINK_STATE:
 526                 status = PORT_PLC;
 527                 port_change_bit = "link state";
 528                 break;
 529         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 530                 status = PORT_CEC;
 531                 port_change_bit = "config error";
 532                 break;
 533         default:
 534                 /* Should never happen */
 535                 return;
 536         }
 537         /* Change bits are all write 1 to clear */
 538         writel(port_status | status, addr);
 539         port_status = readl(addr);
 540
 541         xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n",
 542                  wIndex + 1, port_change_bit, port_status);
 543 }
 544
 545 struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
 546 {
 547         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 548
 549         if (hcd->speed >= HCD_USB3)
 550                 return &xhci->usb3_rhub;
 551         return &xhci->usb2_rhub;
 552 }
 553
 554 /*
 555  * xhci_set_port_power() must be called with xhci->lock held.
 556  * It will release and re-aquire the lock while calling ACPI
 557  * method.
 558  */
 559 static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd,
 560                                 u16 index, bool on, unsigned long *flags)
 561 {
 562         struct xhci_hub *rhub;
 563         struct xhci_port *port;
 564         u32 temp;
 565
 566         rhub = xhci_get_rhub(hcd);
 567         port = rhub->ports[index];
 568         temp = readl(port->addr);
 569
 570         xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n",
 571                  hcd->self.busnum, index + 1, on ? "ON" : "OFF", temp);
 572
 573         temp = xhci_port_state_to_neutral(temp);
 574
 575         if (on) {
 576                 /* Power on */
 577                 writel(temp | PORT_POWER, port->addr);
 578                 readl(port->addr);
 579         } else {
 580                 /* Power off */
 581                 writel(temp & ~PORT_POWER, port->addr);
 582         }
 583
 584         spin_unlock_irqrestore(&xhci->lock, *flags);
 585         temp = usb_acpi_power_manageable(hcd->self.root_hub,
 586                                         index);
 587         if (temp)
 588                 usb_acpi_set_power_state(hcd->self.root_hub,
 589                         index, on);
 590         spin_lock_irqsave(&xhci->lock, *flags);
 591 }
 592
 593 static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
 594         u16 test_mode, u16 wIndex)
 595 {
 596         u32 temp;
 597         struct xhci_port *port;
 598
 599         /* xhci only supports test mode for usb2 ports */
 600         port = xhci->usb2_rhub.ports[wIndex];
 601         temp = readl(port->addr + PORTPMSC);
 602         temp |= test_mode << PORT_TEST_MODE_SHIFT;
 603         writel(temp, port->addr + PORTPMSC);
 604         xhci->test_mode = test_mode;
 605         if (test_mode == TEST_FORCE_EN)
 606                 xhci_start(xhci);
 607 }
 608
 609 static int xhci_enter_test_mode(struct xhci_hcd *xhci,
 610                                 u16 test_mode, u16 wIndex, unsigned long *flags)
 611 {
 612         int i, retval;
 613
 614         /* Disable all Device Slots */
 615         xhci_dbg(xhci, "Disable all slots\n");
 616         spin_unlock_irqrestore(&xhci->lock, *flags);
 617         for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 618                 if (!xhci->devs[i])
 619                         continue;
 620
 621                 retval = xhci_disable_slot(xhci, i);
 622                 if (retval)
 623                         xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 624                                  i, retval);
 625         }
 626         spin_lock_irqsave(&xhci->lock, *flags);
 627         /* Put all ports to the Disable state by clear PP */
 628         xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 629         /* Power off USB3 ports*/
 630         for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
 631                 xhci_set_port_power(xhci, xhci->shared_hcd, i, false, flags);
 632         /* Power off USB2 ports*/
 633         for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
 634                 xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags);
 635         /* Stop the controller */
 636         xhci_dbg(xhci, "Stop controller\n");
 637         retval = xhci_halt(xhci);
 638         if (retval)
 639                 return retval;
 640         /* Disable runtime PM for test mode */
 641         pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller);
 642         /* Set PORTPMSC.PTC field to enter selected test mode */
 643         /* Port is selected by wIndex. port_id = wIndex + 1 */
 644         xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n",
 645                                         test_mode, wIndex + 1);
 646         xhci_port_set_test_mode(xhci, test_mode, wIndex);
 647         return retval;
 648 }
 649
 650 static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 651 {
 652         int retval;
 653
 654         if (!xhci->test_mode) {
 655                 xhci_err(xhci, "Not in test mode, do nothing.\n");
 656                 return 0;
 657         }
 658         if (xhci->test_mode == TEST_FORCE_EN &&
 659                 !(xhci->xhc_state & XHCI_STATE_HALTED)) {
 660                 retval = xhci_halt(xhci);
 661                 if (retval)
 662                         return retval;
 663         }
 664         pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 665         xhci->test_mode = 0;
 666         return xhci_reset(xhci);
 667 }
 668
 669 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
 670                          u32 link_state)
 671 {
 672         u32 temp;
 673         u32 portsc;
 674
 675         portsc = readl(port->addr);
 676         temp = xhci_port_state_to_neutral(portsc);
 677         temp &= ~PORT_PLS_MASK;
 678         temp |= PORT_LINK_STROBE | link_state;
 679         writel(temp, port->addr);
 680
 681         xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x",
 682                  port->rhub->hcd->self.busnum, port->hcd_portnum + 1,
 683                  portsc, temp);
 684 }
 685
 686 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 687                                       struct xhci_port *port, u16 wake_mask)
 688 {
 689         u32 temp;
 690
 691         temp = readl(port->addr);
 692         temp = xhci_port_state_to_neutral(temp);
 693
 694         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 695                 temp |= PORT_WKCONN_E;
 696         else
 697                 temp &= ~PORT_WKCONN_E;
 698
 699         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 700                 temp |= PORT_WKDISC_E;
 701         else
 702                 temp &= ~PORT_WKDISC_E;
 703
 704         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 705                 temp |= PORT_WKOC_E;
 706         else
 707                 temp &= ~PORT_WKOC_E;
 708
 709         writel(temp, port->addr);
 710 }
 711
 712 /* Test and clear port RWC bit */
 713 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 714                              u32 port_bit)
 715 {
 716         u32 temp;
 717
 718         temp = readl(port->addr);
 719         if (temp & port_bit) {
 720                 temp = xhci_port_state_to_neutral(temp);
 721                 temp |= port_bit;
 722                 writel(temp, port->addr);
 723         }
 724 }
 725
 726 /* Updates Link Status for super Speed port */
 727 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 728                 u32 *status, u32 status_reg)
 729 {
 730         u32 pls = status_reg & PORT_PLS_MASK;
 731
 732         /* resume state is a xHCI internal state.
 733          * Do not report it to usb core, instead, pretend to be U3,
 734          * thus usb core knows it's not ready for transfer
 735          */
 736         if (pls == XDEV_RESUME) {
 737                 *status |= USB_SS_PORT_LS_U3;
 738                 return;
 739         }
 740
 741         /* When the CAS bit is set then warm reset
 742          * should be performed on port
 743          */
 744         if (status_reg & PORT_CAS) {
 745                 /* The CAS bit can be set while the port is
 746                  * in any link state.
 747                  * Only roothubs have CAS bit, so we
 748                  * pretend to be in compliance mode
 749                  * unless we're already in compliance
 750                  * or the inactive state.
 751                  */
 752                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
 753                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
 754                         pls = USB_SS_PORT_LS_COMP_MOD;
 755                 }
 756                 /* Return also connection bit -
 757                  * hub state machine resets port
 758                  * when this bit is set.
 759                  */
 760                 pls |= USB_PORT_STAT_CONNECTION;
 761         } else {
 762                 /*
 763                  * If CAS bit isn't set but the Port is already at
 764                  * Compliance Mode, fake a connection so the USB core
 765                  * notices the Compliance state and resets the port.
 766                  * This resolves an issue generated by the SN65LVPE502CP
 767                  * in which sometimes the port enters compliance mode
 768                  * caused by a delay on the host-device negotiation.
 769                  */
 770                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 771                                 (pls == USB_SS_PORT_LS_COMP_MOD))
 772                         pls |= USB_PORT_STAT_CONNECTION;
 773         }
 774
 775         /* update status field */
 776         *status |= pls;
 777 }
 778
 779 /*
 780  * Function for Compliance Mode Quirk.
 781  *
 782  * This Function verifies if all xhc USB3 ports have entered U0, if so,
 783  * the compliance mode timer is deleted. A port won't enter
 784  * compliance mode if it has previously entered U0.
 785  */
 786 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 787                                     u16 wIndex)
 788 {
 789         u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1);
 790         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 791
 792         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 793                 return;
 794
 795         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 796                 xhci->port_status_u0 |= 1 << wIndex;
 797                 if (xhci->port_status_u0 == all_ports_seen_u0) {
 798                         del_timer_sync(&xhci->comp_mode_recovery_timer);
 799                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 800                                 "All USB3 ports have entered U0 already!");
 801                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 802                                 "Compliance Mode Recovery Timer Deleted.");
 803                 }
 804         }
 805 }
 806
 807 static int xhci_handle_usb2_port_link_resume(struct xhci_port *port,
 808                                              u32 *status, u32 portsc,
 809                                              unsigned long flags)
 810 {
 811         struct xhci_bus_state *bus_state;
 812         struct xhci_hcd *xhci;
 813         struct usb_hcd *hcd;
 814         int slot_id;
 815         u32 wIndex;
 816
 817         hcd = port->rhub->hcd;
 818         bus_state = &port->rhub->bus_state;
 819         xhci = hcd_to_xhci(hcd);
 820         wIndex = port->hcd_portnum;
 821
 822         if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) {
 823                 *status = 0xffffffff;
 824                 return -EINVAL;
 825         }
 826         /* did port event handler already start resume timing? */
 827         if (!bus_state->resume_done[wIndex]) {
 828                 /* If not, maybe we are in a host initated resume? */
 829                 if (test_bit(wIndex, &bus_state->resuming_ports)) {
 830                         /* Host initated resume doesn't time the resume
 831                          * signalling using resume_done[].
 832                          * It manually sets RESUME state, sleeps 20ms
 833                          * and sets U0 state. This should probably be
 834                          * changed, but not right now.
 835                          */
 836                 } else {
 837                         /* port resume was discovered now and here,
 838                          * start resume timing
 839                          */
 840                         unsigned long timeout = jiffies +
 841                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 842
 843                         set_bit(wIndex, &bus_state->resuming_ports);
 844                         bus_state->resume_done[wIndex] = timeout;
 845                         mod_timer(&hcd->rh_timer, timeout);
 846                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 847                 }
 848         /* Has resume been signalled for USB_RESUME_TIME yet? */
 849         } else if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) {
 850                 int time_left;
 851
 852                 xhci_dbg(xhci, "resume USB2 port %d-%d\n",
 853                          hcd->self.busnum, wIndex + 1);
 854
 855                 bus_state->resume_done[wIndex] = 0;
 856                 clear_bit(wIndex, &bus_state->resuming_ports);
 857
 858                 set_bit(wIndex, &bus_state->rexit_ports);
 859
 860                 xhci_test_and_clear_bit(xhci, port, PORT_PLC);
 861                 xhci_set_link_state(xhci, port, XDEV_U0);
 862
 863                 spin_unlock_irqrestore(&xhci->lock, flags);
 864                 time_left = wait_for_completion_timeout(
 865                         &bus_state->rexit_done[wIndex],
 866                         msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS));
 867                 spin_lock_irqsave(&xhci->lock, flags);
 868
 869                 if (time_left) {
 870                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 871                                                             wIndex + 1);
 872                         if (!slot_id) {
 873                                 xhci_dbg(xhci, "slot_id is zero\n");
 874                                 *status = 0xffffffff;
 875                                 return -ENODEV;
 876                         }
 877                         xhci_ring_device(xhci, slot_id);
 878                 } else {
 879                         int port_status = readl(port->addr);
 880
 881                         xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n",
 882                                   hcd->self.busnum, wIndex + 1, port_status);
 883                         *status |= USB_PORT_STAT_SUSPEND;
 884                         clear_bit(wIndex, &bus_state->rexit_ports);
 885                 }
 886
 887                 usb_hcd_end_port_resume(&hcd->self, wIndex);
 888                 bus_state->port_c_suspend |= 1 << wIndex;
 889                 bus_state->suspended_ports &= ~(1 << wIndex);
 890         } else {
 891                 /*
 892                  * The resume has been signaling for less than
 893                  * USB_RESUME_TIME. Report the port status as SUSPEND,
 894                  * let the usbcore check port status again and clear
 895                  * resume signaling later.
 896                  */
 897                 *status |= USB_PORT_STAT_SUSPEND;
 898         }
 899         return 0;
 900 }
 901
 902 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
 903 {
 904         u32 ext_stat = 0;
 905         int speed_id;
 906
 907         /* only support rx and tx lane counts of 1 in usb3.1 spec */
 908         speed_id = DEV_PORT_SPEED(raw_port_status);
 909         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
 910         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
 911
 912         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
 913         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
 914
 915         return ext_stat;
 916 }
 917
 918 static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
 919                                       u32 portsc)
 920 {
 921         struct xhci_bus_state *bus_state;
 922         struct xhci_hcd *xhci;
 923         u32 link_state;
 924         u32 portnum;
 925
 926         bus_state = &port->rhub->bus_state;
 927         xhci = hcd_to_xhci(port->rhub->hcd);
 928         link_state = portsc & PORT_PLS_MASK;
 929         portnum = port->hcd_portnum;
 930
 931         /* USB3 specific wPortChange bits
 932          *
 933          * Port link change with port in resume state should not be
 934          * reported to usbcore, as this is an internal state to be
 935          * handled by xhci driver. Reporting PLC to usbcore may
 936          * cause usbcore clearing PLC first and port change event
 937          * irq won't be generated.
 938          */
 939
 940         if (portsc & PORT_PLC && (link_state != XDEV_RESUME))
 941                 *status |= USB_PORT_STAT_C_LINK_STATE << 16;
 942         if (portsc & PORT_WRC)
 943                 *status |= USB_PORT_STAT_C_BH_RESET << 16;
 944         if (portsc & PORT_CEC)
 945                 *status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
 946
 947         /* USB3 specific wPortStatus bits */
 948         if (portsc & PORT_POWER) {
 949                 *status |= USB_SS_PORT_STAT_POWER;
 950                 /* link state handling */
 951                 if (link_state == XDEV_U0)
 952                         bus_state->suspended_ports &= ~(1 << portnum);
 953         }
 954
 955         xhci_hub_report_usb3_link_state(xhci, status, portsc);
 956         xhci_del_comp_mod_timer(xhci, portsc, portnum);
 957 }
 958
 959 static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
 960                                       u32 portsc, unsigned long flags)
 961 {
 962         struct xhci_bus_state *bus_state;
 963         u32 link_state;
 964         u32 portnum;
 965         int ret;
 966
 967         bus_state = &port->rhub->bus_state;
 968         link_state = portsc & PORT_PLS_MASK;
 969         portnum = port->hcd_portnum;
 970
 971         /* USB2 wPortStatus bits */
 972         if (portsc & PORT_POWER) {
 973                 *status |= USB_PORT_STAT_POWER;
 974
 975                 /* link state is only valid if port is powered */
 976                 if (link_state == XDEV_U3)
 977                         *status |= USB_PORT_STAT_SUSPEND;
 978                 if (link_state == XDEV_U2)
 979                         *status |= USB_PORT_STAT_L1;
 980                 if (link_state == XDEV_U0) {
 981                         bus_state->resume_done[portnum] = 0;
 982                         clear_bit(portnum, &bus_state->resuming_ports);
 983                         if (bus_state->suspended_ports & (1 << portnum)) {
 984                                 bus_state->suspended_ports &= ~(1 << portnum);
 985                                 bus_state->port_c_suspend |= 1 << portnum;
 986                         }
 987                 }
 988                 if (link_state == XDEV_RESUME) {
 989                         ret = xhci_handle_usb2_port_link_resume(port, status,
 990                                                                 portsc, flags);
 991                         if (ret)
 992                                 return;
 993                 }
 994         }
 995 }
 996
 997 /*
 998  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
 999  * 3.0 hubs use.
1000  *
1001  * Possible side effects:
1002  *  - Mark a port as being done with device resume,
1003  *    and ring the endpoint doorbells.
1004  *  - Stop the Synopsys redriver Compliance Mode polling.
1005  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
1006  */
1007 static u32 xhci_get_port_status(struct usb_hcd *hcd,
1008                 struct xhci_bus_state *bus_state,
1009         u16 wIndex, u32 raw_port_status,
1010                 unsigned long flags)
1011         __releases(&xhci->lock)
1012         __acquires(&xhci->lock)
1013 {
1014         u32 status = 0;
1015         struct xhci_hub *rhub;
1016         struct xhci_port *port;
1017
1018         rhub = xhci_get_rhub(hcd);
1019         port = rhub->ports[wIndex];
1020
1021         /* common wPortChange bits */
1022         if (raw_port_status & PORT_CSC)
1023                 status |= USB_PORT_STAT_C_CONNECTION << 16;
1024         if (raw_port_status & PORT_PEC)
1025                 status |= USB_PORT_STAT_C_ENABLE << 16;
1026         if ((raw_port_status & PORT_OCC))
1027                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1028         if ((raw_port_status & PORT_RC))
1029                 status |= USB_PORT_STAT_C_RESET << 16;
1030
1031         /* common wPortStatus bits */
1032         if (raw_port_status & PORT_CONNECT) {
1033                 status |= USB_PORT_STAT_CONNECTION;
1034                 status |= xhci_port_speed(raw_port_status);
1035         }
1036         if (raw_port_status & PORT_PE)
1037                 status |= USB_PORT_STAT_ENABLE;
1038         if (raw_port_status & PORT_OC)
1039                 status |= USB_PORT_STAT_OVERCURRENT;
1040         if (raw_port_status & PORT_RESET)
1041                 status |= USB_PORT_STAT_RESET;
1042
1043         /* USB2 and USB3 specific bits, including Port Link State */
1044         if (hcd->speed >= HCD_USB3)
1045                 xhci_get_usb3_port_status(port, &status, raw_port_status);
1046         else
1047                 xhci_get_usb2_port_status(port, &status, raw_port_status,
1048                                           flags);
1049         /*
1050          * Clear stale usb2 resume signalling variables in case port changed
1051          * state during resume signalling. For example on error
1052          */
1053         if ((bus_state->resume_done[wIndex] ||
1054              test_bit(wIndex, &bus_state->resuming_ports)) &&
1055             (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
1056             (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
1057                 bus_state->resume_done[wIndex] = 0;
1058                 clear_bit(wIndex, &bus_state->resuming_ports);
1059                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1060         }
1061
1062         if (bus_state->port_c_suspend & (1 << wIndex))
1063                 status |= USB_PORT_STAT_C_SUSPEND << 16;
1064
1065         return status;
1066 }
1067
1068 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
1069                 u16 wIndex, char *buf, u16 wLength)
1070 {
1071         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1072         int max_ports;
1073         unsigned long flags;
1074         u32 temp, status;
1075         int retval = 0;
1076         int slot_id;
1077         struct xhci_bus_state *bus_state;
1078         u16 link_state = 0;
1079         u16 wake_mask = 0;
1080         u16 timeout = 0;
1081         u16 test_mode = 0;
1082         struct xhci_hub *rhub;
1083         struct xhci_port **ports;
1084
1085         rhub = xhci_get_rhub(hcd);
1086         ports = rhub->ports;
1087         max_ports = rhub->num_ports;
1088         bus_state = &rhub->bus_state;
1089
1090         spin_lock_irqsave(&xhci->lock, flags);
1091         switch (typeReq) {
1092         case GetHubStatus:
1093                 /* No power source, over-current reported per port */
1094                 memset(buf, 0, 4);
1095                 break;
1096         case GetHubDescriptor:
1097                 /* Check to make sure userspace is asking for the USB 3.0 hub
1098                  * descriptor for the USB 3.0 roothub.  If not, we stall the
1099                  * endpoint, like external hubs do.
1100                  */
1101                 if (hcd->speed >= HCD_USB3 &&
1102                                 (wLength < USB_DT_SS_HUB_SIZE ||
1103                                  wValue != (USB_DT_SS_HUB << 8))) {
1104                         xhci_dbg(xhci, "Wrong hub descriptor type for "
1105                                         "USB 3.0 roothub.\n");
1106                         goto error;
1107                 }
1108                 xhci_hub_descriptor(hcd, xhci,
1109                                 (struct usb_hub_descriptor *) buf);
1110                 break;
1111         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1112                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
1113                         goto error;
1114
1115                 if (hcd->speed < HCD_USB3)
1116                         goto error;
1117
1118                 retval = xhci_create_usb3_bos_desc(xhci, buf, wLength);
1119                 spin_unlock_irqrestore(&xhci->lock, flags);
1120                 return retval;
1121         case GetPortStatus:
1122                 if (!wIndex || wIndex > max_ports)
1123                         goto error;
1124                 wIndex--;
1125                 temp = readl(ports[wIndex]->addr);
1126                 if (temp == ~(u32)0) {
1127                         xhci_hc_died(xhci);
1128                         retval = -ENODEV;
1129                         break;
1130                 }
1131                 trace_xhci_get_port_status(wIndex, temp);
1132                 status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
1133                                               flags);
1134                 if (status == 0xffffffff)
1135                         goto error;
1136
1137                 xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x",
1138                          hcd->self.busnum, wIndex + 1, temp, status);
1139
1140                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
1141                 /* if USB 3.1 extended port status return additional 4 bytes */
1142                 if (wValue == 0x02) {
1143                         u32 port_li;
1144
1145                         if (hcd->speed < HCD_USB31 || wLength != 8) {
1146                                 xhci_err(xhci, "get ext port status invalid parameter\n");
1147                                 retval = -EINVAL;
1148                                 break;
1149                         }
1150                         port_li = readl(ports[wIndex]->addr + PORTLI);
1151                         status = xhci_get_ext_port_status(temp, port_li);
1152                         put_unaligned_le32(cpu_to_le32(status), &buf[4]);
1153                 }
1154                 break;
1155         case SetPortFeature:
1156                 if (wValue == USB_PORT_FEAT_LINK_STATE)
1157                         link_state = (wIndex & 0xff00) >> 3;
1158                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
1159                         wake_mask = wIndex & 0xff00;
1160                 if (wValue == USB_PORT_FEAT_TEST)
1161                         test_mode = (wIndex & 0xff00) >> 8;
1162                 /* The MSB of wIndex is the U1/U2 timeout */
1163                 timeout = (wIndex & 0xff00) >> 8;
1164                 wIndex &= 0xff;
1165                 if (!wIndex || wIndex > max_ports)
1166                         goto error;
1167                 wIndex--;
1168                 temp = readl(ports[wIndex]->addr);
1169                 if (temp == ~(u32)0) {
1170                         xhci_hc_died(xhci);
1171                         retval = -ENODEV;
1172                         break;
1173                 }
1174                 temp = xhci_port_state_to_neutral(temp);
1175                 /* FIXME: What new port features do we need to support? */
1176                 switch (wValue) {
1177                 case USB_PORT_FEAT_SUSPEND:
1178                         temp = readl(ports[wIndex]->addr);
1179                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
1180                                 /* Resume the port to U0 first */
1181                                 xhci_set_link_state(xhci, ports[wIndex],
1182                                                         XDEV_U0);
1183                                 spin_unlock_irqrestore(&xhci->lock, flags);
1184                                 msleep(10);
1185                                 spin_lock_irqsave(&xhci->lock, flags);
1186                         }
1187                         /* In spec software should not attempt to suspend
1188                          * a port unless the port reports that it is in the
1189                          * enabled (PED = ‘1’,PLS < ‘3’) state.
1190                          */
1191                         temp = readl(ports[wIndex]->addr);
1192                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1193                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
1194                                 xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n",
1195                                           hcd->self.busnum, wIndex + 1);
1196                                 goto error;
1197                         }
1198
1199                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1200                                         wIndex + 1);
1201                         if (!slot_id) {
1202                                 xhci_warn(xhci, "slot_id is zero\n");
1203                                 goto error;
1204                         }
1205                         /* unlock to execute stop endpoint commands */
1206                         spin_unlock_irqrestore(&xhci->lock, flags);
1207                         xhci_stop_device(xhci, slot_id, 1);
1208                         spin_lock_irqsave(&xhci->lock, flags);
1209
1210                         xhci_set_link_state(xhci, ports[wIndex], XDEV_U3);
1211
1212                         spin_unlock_irqrestore(&xhci->lock, flags);
1213                         msleep(10); /* wait device to enter */
1214                         spin_lock_irqsave(&xhci->lock, flags);
1215
1216                         temp = readl(ports[wIndex]->addr);
1217                         bus_state->suspended_ports |= 1 << wIndex;
1218                         break;
1219                 case USB_PORT_FEAT_LINK_STATE:
1220                         temp = readl(ports[wIndex]->addr);
1221                         /* Disable port */
1222                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1223                                 xhci_dbg(xhci, "Disable port %d\n", wIndex);
1224                                 temp = xhci_port_state_to_neutral(temp);
1225                                 /*
1226                                  * Clear all change bits, so that we get a new
1227                                  * connection event.
1228                                  */
1229                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1230                                         PORT_OCC | PORT_RC | PORT_PLC |
1231                                         PORT_CEC;
1232                                 writel(temp | PORT_PE, ports[wIndex]->addr);
1233                                 temp = readl(ports[wIndex]->addr);
1234                                 break;
1235                         }
1236
1237                         /* Put link in RxDetect (enable port) */
1238                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1239                                 xhci_dbg(xhci, "Enable port %d\n", wIndex);
1240                                 xhci_set_link_state(xhci, ports[wIndex],
1241                                                         link_state);
1242                                 temp = readl(ports[wIndex]->addr);
1243                                 break;
1244                         }
1245
1246                         /*
1247                          * For xHCI 1.1 according to section 4.19.1.2.4.1 a
1248                          * root hub port's transition to compliance mode upon
1249                          * detecting LFPS timeout may be controlled by an
1250                          * Compliance Transition Enabled (CTE) flag (not
1251                          * software visible). This flag is set by writing 0xA
1252                          * to PORTSC PLS field which will allow transition to
1253                          * compliance mode the next time LFPS timeout is
1254                          * encountered. A warm reset will clear it.
1255                          *
1256                          * The CTE flag is only supported if the HCCPARAMS2 CTC
1257                          * flag is set, otherwise, the compliance substate is
1258                          * automatically entered as on 1.0 and prior.
1259                          */
1260                         if (link_state == USB_SS_PORT_LS_COMP_MOD) {
1261                                 if (!HCC2_CTC(xhci->hcc_params2)) {
1262                                         xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
1263                                         break;
1264                                 }
1265
1266                                 if ((temp & PORT_CONNECT)) {
1267                                         xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
1268                                         goto error;
1269                                 }
1270
1271                                 xhci_dbg(xhci, "Enable compliance mode transition for port %d\n",
1272                                                 wIndex);
1273                                 xhci_set_link_state(xhci, ports[wIndex],
1274                                                 link_state);
1275
1276                                 temp = readl(ports[wIndex]->addr);
1277                                 break;
1278                         }
1279                         /* Port must be enabled */
1280                         if (!(temp & PORT_PE)) {
1281                                 retval = -ENODEV;
1282                                 break;
1283                         }
1284                         /* Can't set port link state above '3' (U3) */
1285                         if (link_state > USB_SS_PORT_LS_U3) {
1286                                 xhci_warn(xhci, "Cannot set port %d link state %d\n",
1287                                          wIndex, link_state);
1288                                 goto error;
1289                         }
1290                         if (link_state == USB_SS_PORT_LS_U3) {
1291                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1292                                                 wIndex + 1);
1293                                 if (slot_id) {
1294                                         /* unlock to execute stop endpoint
1295                                          * commands */
1296                                         spin_unlock_irqrestore(&xhci->lock,
1297                                                                 flags);
1298                                         xhci_stop_device(xhci, slot_id, 1);
1299                                         spin_lock_irqsave(&xhci->lock, flags);
1300                                 }
1301                         }
1302
1303                         xhci_set_link_state(xhci, ports[wIndex], link_state);
1304
1305                         spin_unlock_irqrestore(&xhci->lock, flags);
1306                         msleep(20); /* wait device to enter */
1307                         spin_lock_irqsave(&xhci->lock, flags);
1308
1309                         temp = readl(ports[wIndex]->addr);
1310                         if (link_state == USB_SS_PORT_LS_U3)
1311                                 bus_state->suspended_ports |= 1 << wIndex;
1312                         break;
1313                 case USB_PORT_FEAT_POWER:
1314                         /*
1315                          * Turn on ports, even if there isn't per-port switching.
1316                          * HC will report connect events even before this is set.
1317                          * However, hub_wq will ignore the roothub events until
1318                          * the roothub is registered.
1319                          */
1320                         xhci_set_port_power(xhci, hcd, wIndex, true, &flags);
1321                         break;
1322                 case USB_PORT_FEAT_RESET:
1323                         temp = (temp | PORT_RESET);
1324                         writel(temp, ports[wIndex]->addr);
1325
1326                         temp = readl(ports[wIndex]->addr);
1327                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
1328                         break;
1329                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1330                         xhci_set_remote_wake_mask(xhci, ports[wIndex],
1331                                                   wake_mask);
1332                         temp = readl(ports[wIndex]->addr);
1333                         xhci_dbg(xhci, "set port remote wake mask, "
1334                                         "actual port %d status  = 0x%x\n",
1335                                         wIndex, temp);
1336                         break;
1337                 case USB_PORT_FEAT_BH_PORT_RESET:
1338                         temp |= PORT_WR;
1339                         writel(temp, ports[wIndex]->addr);
1340                         temp = readl(ports[wIndex]->addr);
1341                         break;
1342                 case USB_PORT_FEAT_U1_TIMEOUT:
1343                         if (hcd->speed < HCD_USB3)
1344                                 goto error;
1345                         temp = readl(ports[wIndex]->addr + PORTPMSC);
1346                         temp &= ~PORT_U1_TIMEOUT_MASK;
1347                         temp |= PORT_U1_TIMEOUT(timeout);
1348                         writel(temp, ports[wIndex]->addr + PORTPMSC);
1349                         break;
1350                 case USB_PORT_FEAT_U2_TIMEOUT:
1351                         if (hcd->speed < HCD_USB3)
1352                                 goto error;
1353                         temp = readl(ports[wIndex]->addr + PORTPMSC);
1354                         temp &= ~PORT_U2_TIMEOUT_MASK;
1355                         temp |= PORT_U2_TIMEOUT(timeout);
1356                         writel(temp, ports[wIndex]->addr + PORTPMSC);
1357                         break;
1358                 case USB_PORT_FEAT_TEST:
1359                         /* 4.19.6 Port Test Modes (USB2 Test Mode) */
1360                         if (hcd->speed != HCD_USB2)
1361                                 goto error;
1362                         if (test_mode > TEST_FORCE_EN || test_mode < TEST_J)
1363                                 goto error;
1364                         retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
1365                                                       &flags);
1366                         break;
1367                 default:
1368                         goto error;
1369                 }
1370                 /* unblock any posted writes */
1371                 temp = readl(ports[wIndex]->addr);
1372                 break;
1373         case ClearPortFeature:
1374                 if (!wIndex || wIndex > max_ports)
1375                         goto error;
1376                 wIndex--;
1377                 temp = readl(ports[wIndex]->addr);
1378                 if (temp == ~(u32)0) {
1379                         xhci_hc_died(xhci);
1380                         retval = -ENODEV;
1381                         break;
1382                 }
1383                 /* FIXME: What new port features do we need to support? */
1384                 temp = xhci_port_state_to_neutral(temp);
1385                 switch (wValue) {
1386                 case USB_PORT_FEAT_SUSPEND:
1387                         temp = readl(ports[wIndex]->addr);
1388                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1389                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1390                         if (temp & PORT_RESET)
1391                                 goto error;
1392                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1393                                 if ((temp & PORT_PE) == 0)
1394                                         goto error;
1395
1396                                 set_bit(wIndex, &bus_state->resuming_ports);
1397                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1398                                 xhci_set_link_state(xhci, ports[wIndex],
1399                                                     XDEV_RESUME);
1400                                 spin_unlock_irqrestore(&xhci->lock, flags);
1401                                 msleep(USB_RESUME_TIMEOUT);
1402                                 spin_lock_irqsave(&xhci->lock, flags);
1403                                 xhci_set_link_state(xhci, ports[wIndex],
1404                                                         XDEV_U0);
1405                                 clear_bit(wIndex, &bus_state->resuming_ports);
1406                                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1407                         }
1408                         bus_state->port_c_suspend |= 1 << wIndex;
1409
1410                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1411                                         wIndex + 1);
1412                         if (!slot_id) {
1413                                 xhci_dbg(xhci, "slot_id is zero\n");
1414                                 goto error;
1415                         }
1416                         xhci_ring_device(xhci, slot_id);
1417                         break;
1418                 case USB_PORT_FEAT_C_SUSPEND:
1419                         bus_state->port_c_suspend &= ~(1 << wIndex);
1420                         /* fall through */
1421                 case USB_PORT_FEAT_C_RESET:
1422                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1423                 case USB_PORT_FEAT_C_CONNECTION:
1424                 case USB_PORT_FEAT_C_OVER_CURRENT:
1425                 case USB_PORT_FEAT_C_ENABLE:
1426                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1427                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1428                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1429                                         ports[wIndex]->addr, temp);
1430                         break;
1431                 case USB_PORT_FEAT_ENABLE:
1432                         xhci_disable_port(hcd, xhci, wIndex,
1433                                         ports[wIndex]->addr, temp);
1434                         break;
1435                 case USB_PORT_FEAT_POWER:
1436                         xhci_set_port_power(xhci, hcd, wIndex, false, &flags);
1437                         break;
1438                 case USB_PORT_FEAT_TEST:
1439                         retval = xhci_exit_test_mode(xhci);
1440                         break;
1441                 default:
1442                         goto error;
1443                 }
1444                 break;
1445         default:
1446 error:
1447                 /* "stall" on error */
1448                 retval = -EPIPE;
1449         }
1450         spin_unlock_irqrestore(&xhci->lock, flags);
1451         return retval;
1452 }
1453
1454 /*
1455  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1456  * Ports are 0-indexed from the HCD point of view,
1457  * and 1-indexed from the USB core pointer of view.
1458  *
1459  * Note that the status change bits will be cleared as soon as a port status
1460  * change event is generated, so we use the saved status from that event.
1461  */
1462 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1463 {
1464         unsigned long flags;
1465         u32 temp, status;
1466         u32 mask;
1467         int i, retval;
1468         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1469         int max_ports;
1470         struct xhci_bus_state *bus_state;
1471         bool reset_change = false;
1472         struct xhci_hub *rhub;
1473         struct xhci_port **ports;
1474
1475         rhub = xhci_get_rhub(hcd);
1476         ports = rhub->ports;
1477         max_ports = rhub->num_ports;
1478         bus_state = &rhub->bus_state;
1479
1480         /* Initial status is no changes */
1481         retval = (max_ports + 8) / 8;
1482         memset(buf, 0, retval);
1483
1484         /*
1485          * Inform the usbcore about resume-in-progress by returning
1486          * a non-zero value even if there are no status changes.
1487          */
1488         status = bus_state->resuming_ports;
1489
1490         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1491
1492         spin_lock_irqsave(&xhci->lock, flags);
1493         /* For each port, did anything change?  If so, set that bit in buf. */
1494         for (i = 0; i < max_ports; i++) {
1495                 temp = readl(ports[i]->addr);
1496                 if (temp == ~(u32)0) {
1497                         xhci_hc_died(xhci);
1498                         retval = -ENODEV;
1499                         break;
1500                 }
1501                 trace_xhci_hub_status_data(i, temp);
1502
1503                 if ((temp & mask) != 0 ||
1504                         (bus_state->port_c_suspend & 1 << i) ||
1505                         (bus_state->resume_done[i] && time_after_eq(
1506                             jiffies, bus_state->resume_done[i]))) {
1507                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1508                         status = 1;
1509                 }
1510                 if ((temp & PORT_RC))
1511                         reset_change = true;
1512         }
1513         if (!status && !reset_change) {
1514                 xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
1515                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1516         }
1517         spin_unlock_irqrestore(&xhci->lock, flags);
1518         return status ? retval : 0;
1519 }
1520
1521 #ifdef CONFIG_PM
1522
1523 int xhci_bus_suspend(struct usb_hcd *hcd)
1524 {
1525         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1526         int max_ports, port_index;
1527         struct xhci_bus_state *bus_state;
1528         unsigned long flags;
1529         struct xhci_hub *rhub;
1530         struct xhci_port **ports;
1531         u32 portsc_buf[USB_MAXCHILDREN];
1532         bool wake_enabled;
1533
1534         rhub = xhci_get_rhub(hcd);
1535         ports = rhub->ports;
1536         max_ports = rhub->num_ports;
1537         bus_state = &rhub->bus_state;
1538         wake_enabled = hcd->self.root_hub->do_remote_wakeup;
1539
1540         spin_lock_irqsave(&xhci->lock, flags);
1541
1542         if (wake_enabled) {
1543                 if (bus_state->resuming_ports ||        /* USB2 */
1544                     bus_state->port_remote_wakeup) {    /* USB3 */
1545                         spin_unlock_irqrestore(&xhci->lock, flags);
1546                         xhci_dbg(xhci, "suspend failed because a port is resuming\n");
1547                         return -EBUSY;
1548                 }
1549         }
1550         /*
1551          * Prepare ports for suspend, but don't write anything before all ports
1552          * are checked and we know bus suspend can proceed
1553          */
1554         bus_state->bus_suspended = 0;
1555         port_index = max_ports;
1556         while (port_index--) {
1557                 u32 t1, t2;
1558                 int retries = 10;
1559 retry:
1560                 t1 = readl(ports[port_index]->addr);
1561                 t2 = xhci_port_state_to_neutral(t1);
1562                 portsc_buf[port_index] = 0;
1563
1564                 /*
1565                  * Give a USB3 port in link training time to finish, but don't
1566                  * prevent suspend as port might be stuck
1567                  */
1568                 if ((hcd->speed >= HCD_USB3) && retries-- &&
1569                     (t1 & PORT_PLS_MASK) == XDEV_POLLING) {
1570                         spin_unlock_irqrestore(&xhci->lock, flags);
1571                         msleep(XHCI_PORT_POLLING_LFPS_TIME);
1572                         spin_lock_irqsave(&xhci->lock, flags);
1573                         xhci_dbg(xhci, "port %d polling in bus suspend, waiting\n",
1574                                  port_index);
1575                         goto retry;
1576                 }
1577                 /* suspend ports in U0, or bail out for new connect changes */
1578                 if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
1579                         if ((t1 & PORT_CSC) && wake_enabled) {
1580                                 bus_state->bus_suspended = 0;
1581                                 spin_unlock_irqrestore(&xhci->lock, flags);
1582                                 xhci_dbg(xhci, "Bus suspend bailout, port connect change\n");
1583                                 return -EBUSY;
1584                         }
1585                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
1586                         t2 &= ~PORT_PLS_MASK;
1587                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1588                         set_bit(port_index, &bus_state->bus_suspended);
1589                 }
1590                 /* USB core sets remote wake mask for USB 3.0 hubs,
1591                  * including the USB 3.0 roothub, but only if CONFIG_PM
1592                  * is enabled, so also enable remote wake here.
1593                  */
1594                 if (wake_enabled) {
1595                         if (t1 & PORT_CONNECT) {
1596                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1597                                 t2 &= ~PORT_WKCONN_E;
1598                         } else {
1599                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1600                                 t2 &= ~PORT_WKDISC_E;
1601                         }
1602
1603                         if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
1604                             (hcd->speed < HCD_USB3)) {
1605                                 if (usb_amd_pt_check_port(hcd->self.controller,
1606                                                           port_index))
1607                                         t2 &= ~PORT_WAKE_BITS;
1608                         }
1609                 } else
1610                         t2 &= ~PORT_WAKE_BITS;
1611
1612                 t1 = xhci_port_state_to_neutral(t1);
1613                 if (t1 != t2)
1614                         portsc_buf[port_index] = t2;
1615         }
1616
1617         /* write port settings, stopping and suspending ports if needed */
1618         port_index = max_ports;
1619         while (port_index--) {
1620                 if (!portsc_buf[port_index])
1621                         continue;
1622                 if (test_bit(port_index, &bus_state->bus_suspended)) {
1623                         int slot_id;
1624
1625                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1626                                                             port_index + 1);
1627                         if (slot_id) {
1628                                 spin_unlock_irqrestore(&xhci->lock, flags);
1629                                 xhci_stop_device(xhci, slot_id, 1);
1630                                 spin_lock_irqsave(&xhci->lock, flags);
1631                         }
1632                 }
1633                 writel(portsc_buf[port_index], ports[port_index]->addr);
1634         }
1635         hcd->state = HC_STATE_SUSPENDED;
1636         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1637         spin_unlock_irqrestore(&xhci->lock, flags);
1638         return 0;
1639 }
1640
1641 /*
1642  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1643  * warm reset a USB3 device stuck in polling or compliance mode after resume.
1644  * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1645  */
1646 static bool xhci_port_missing_cas_quirk(struct xhci_port *port)
1647 {
1648         u32 portsc;
1649
1650         portsc = readl(port->addr);
1651
1652         /* if any of these are set we are not stuck */
1653         if (portsc & (PORT_CONNECT | PORT_CAS))
1654                 return false;
1655
1656         if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1657             ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1658                 return false;
1659
1660         /* clear wakeup/change bits, and do a warm port reset */
1661         portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1662         portsc |= PORT_WR;
1663         writel(portsc, port->addr);
1664         /* flush write */
1665         readl(port->addr);
1666         return true;
1667 }
1668
1669 int xhci_bus_resume(struct usb_hcd *hcd)
1670 {
1671         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1672         struct xhci_bus_state *bus_state;
1673         unsigned long flags;
1674         int max_ports, port_index;
1675         int slot_id;
1676         int sret;
1677         u32 next_state;
1678         u32 temp, portsc;
1679         struct xhci_hub *rhub;
1680         struct xhci_port **ports;
1681
1682         rhub = xhci_get_rhub(hcd);
1683         ports = rhub->ports;
1684         max_ports = rhub->num_ports;
1685         bus_state = &rhub->bus_state;
1686
1687         if (time_before(jiffies, bus_state->next_statechange))
1688                 msleep(5);
1689
1690         spin_lock_irqsave(&xhci->lock, flags);
1691         if (!HCD_HW_ACCESSIBLE(hcd)) {
1692                 spin_unlock_irqrestore(&xhci->lock, flags);
1693                 return -ESHUTDOWN;
1694         }
1695
1696         /* delay the irqs */
1697         temp = readl(&xhci->op_regs->command);
1698         temp &= ~CMD_EIE;
1699         writel(temp, &xhci->op_regs->command);
1700
1701         /* bus specific resume for ports we suspended at bus_suspend */
1702         if (hcd->speed >= HCD_USB3)
1703                 next_state = XDEV_U0;
1704         else
1705                 next_state = XDEV_RESUME;
1706
1707         port_index = max_ports;
1708         while (port_index--) {
1709                 portsc = readl(ports[port_index]->addr);
1710
1711                 /* warm reset CAS limited ports stuck in polling/compliance */
1712                 if ((xhci->quirks & XHCI_MISSING_CAS) &&
1713                     (hcd->speed >= HCD_USB3) &&
1714                     xhci_port_missing_cas_quirk(ports[port_index])) {
1715                         xhci_dbg(xhci, "reset stuck port %d\n", port_index);
1716                         clear_bit(port_index, &bus_state->bus_suspended);
1717                         continue;
1718                 }
1719                 /* resume if we suspended the link, and it is still suspended */
1720                 if (test_bit(port_index, &bus_state->bus_suspended))
1721                         switch (portsc & PORT_PLS_MASK) {
1722                         case XDEV_U3:
1723                                 portsc = xhci_port_state_to_neutral(portsc);
1724                                 portsc &= ~PORT_PLS_MASK;
1725                                 portsc |= PORT_LINK_STROBE | next_state;
1726                                 break;
1727                         case XDEV_RESUME:
1728                                 /* resume already initiated */
1729                                 break;
1730                         default:
1731                                 /* not in a resumeable state, ignore it */
1732                                 clear_bit(port_index,
1733                                           &bus_state->bus_suspended);
1734                                 break;
1735                         }
1736                 /* disable wake for all ports, write new link state if needed */
1737                 portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1738                 writel(portsc, ports[port_index]->addr);
1739         }
1740
1741         /* USB2 specific resume signaling delay and U0 link state transition */
1742         if (hcd->speed < HCD_USB3) {
1743                 if (bus_state->bus_suspended) {
1744                         spin_unlock_irqrestore(&xhci->lock, flags);
1745                         msleep(USB_RESUME_TIMEOUT);
1746                         spin_lock_irqsave(&xhci->lock, flags);
1747                 }
1748                 for_each_set_bit(port_index, &bus_state->bus_suspended,
1749                                  BITS_PER_LONG) {
1750                         /* Clear PLC to poll it later for U0 transition */
1751                         xhci_test_and_clear_bit(xhci, ports[port_index],
1752                                                 PORT_PLC);
1753                         xhci_set_link_state(xhci, ports[port_index], XDEV_U0);
1754                 }
1755         }
1756
1757         /* poll for U0 link state complete, both USB2 and USB3 */
1758         for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) {
1759                 sret = xhci_handshake(ports[port_index]->addr, PORT_PLC,
1760                                       PORT_PLC, 10 * 1000);
1761                 if (sret) {
1762                         xhci_warn(xhci, "port %d resume PLC timeout\n",
1763                                   port_index);
1764                         continue;
1765                 }
1766                 xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC);
1767                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1768                 if (slot_id)
1769                         xhci_ring_device(xhci, slot_id);
1770         }
1771         (void) readl(&xhci->op_regs->command);
1772
1773         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1774         /* re-enable irqs */
1775         temp = readl(&xhci->op_regs->command);
1776         temp |= CMD_EIE;
1777         writel(temp, &xhci->op_regs->command);
1778         temp = readl(&xhci->op_regs->command);
1779
1780         spin_unlock_irqrestore(&xhci->lock, flags);
1781         return 0;
1782 }
1783
1784 unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
1785 {
1786         struct xhci_hub *rhub = xhci_get_rhub(hcd);
1787
1788         /* USB3 port wakeups are reported via usb_wakeup_notification() */
1789         return rhub->bus_state.resuming_ports;  /* USB2 ports only */
1790 }
1791
1792 #endif  /* CONFIG_PM */