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 * Given a port state, this function returns a value that would result in the 431 * port being in the same state, if the value was written to the port status 432 * control register. 433 * Save Read Only (RO) bits and save read/write bits where 434 * writing a 0 clears the bit and writing a 1 sets the bit (RWS). 435 * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect. 436 */ 437 u32 xhci_port_state_to_neutral(u32 state) 438 { 439 /* Save read-only status and port state */ 440 return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS); 441 } 442 443 /* 444 * find slot id based on port number. 445 * @port: The one-based port number from one of the two split roothubs. 446 */ 447 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, 448 u16 port) 449 { 450 int slot_id; 451 int i; 452 enum usb_device_speed speed; 453 454 slot_id = 0; 455 for (i = 0; i < MAX_HC_SLOTS; i++) { 456 if (!xhci->devs[i] || !xhci->devs[i]->udev) 457 continue; 458 speed = xhci->devs[i]->udev->speed; 459 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3)) 460 && xhci->devs[i]->fake_port == port) { 461 slot_id = i; 462 break; 463 } 464 } 465 466 return slot_id; 467 } 468 469 /* 470 * Stop device 471 * It issues stop endpoint command for EP 0 to 30. And wait the last command 472 * to complete. 473 * suspend will set to 1, if suspend bit need to set in command. 474 */ 475 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend) 476 { 477 struct xhci_virt_device *virt_dev; 478 struct xhci_command *cmd; 479 unsigned long flags; 480 int ret; 481 int i; 482 483 ret = 0; 484 virt_dev = xhci->devs[slot_id]; 485 if (!virt_dev) 486 return -ENODEV; 487 488 trace_xhci_stop_device(virt_dev); 489 490 cmd = xhci_alloc_command(xhci, true, GFP_NOIO); 491 if (!cmd) 492 return -ENOMEM; 493 494 spin_lock_irqsave(&xhci->lock, flags); 495 for (i = LAST_EP_INDEX; i > 0; i--) { 496 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) { 497 struct xhci_ep_ctx *ep_ctx; 498 struct xhci_command *command; 499 500 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i); 501 502 /* Check ep is running, required by AMD SNPS 3.1 xHC */ 503 if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING) 504 continue; 505 506 command = xhci_alloc_command(xhci, false, GFP_NOWAIT); 507 if (!command) { 508 spin_unlock_irqrestore(&xhci->lock, flags); 509 ret = -ENOMEM; 510 goto cmd_cleanup; 511 } 512 513 ret = xhci_queue_stop_endpoint(xhci, command, slot_id, 514 i, suspend); 515 if (ret) { 516 spin_unlock_irqrestore(&xhci->lock, flags); 517 xhci_free_command(xhci, command); 518 goto cmd_cleanup; 519 } 520 } 521 } 522 ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend); 523 if (ret) { 524 spin_unlock_irqrestore(&xhci->lock, flags); 525 goto cmd_cleanup; 526 } 527 528 xhci_ring_cmd_db(xhci); 529 spin_unlock_irqrestore(&xhci->lock, flags); 530 531 /* Wait for last stop endpoint command to finish */ 532 wait_for_completion(cmd->completion); 533 534 if (cmd->status == COMP_COMMAND_ABORTED || 535 cmd->status == COMP_COMMAND_RING_STOPPED) { 536 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n"); 537 ret = -ETIME; 538 } 539 540 cmd_cleanup: 541 xhci_free_command(xhci, cmd); 542 return ret; 543 } 544 545 /* 546 * Ring device, it rings the all doorbells unconditionally. 547 */ 548 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id) 549 { 550 int i, s; 551 struct xhci_virt_ep *ep; 552 553 for (i = 0; i < LAST_EP_INDEX + 1; i++) { 554 ep = &xhci->devs[slot_id]->eps[i]; 555 556 if (ep->ep_state & EP_HAS_STREAMS) { 557 for (s = 1; s < ep->stream_info->num_streams; s++) 558 xhci_ring_ep_doorbell(xhci, slot_id, i, s); 559 } else if (ep->ring && ep->ring->dequeue) { 560 xhci_ring_ep_doorbell(xhci, slot_id, i, 0); 561 } 562 } 563 564 return; 565 } 566 567 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, 568 u16 wIndex, __le32 __iomem *addr, u32 port_status) 569 { 570 /* Don't allow the USB core to disable SuperSpeed ports. */ 571 if (hcd->speed >= HCD_USB3) { 572 xhci_dbg(xhci, "Ignoring request to disable " 573 "SuperSpeed port.\n"); 574 return; 575 } 576 577 if (xhci->quirks & XHCI_BROKEN_PORT_PED) { 578 xhci_dbg(xhci, 579 "Broken Port Enabled/Disabled, ignoring port disable request.\n"); 580 return; 581 } 582 583 /* Write 1 to disable the port */ 584 writel(port_status | PORT_PE, addr); 585 port_status = readl(addr); 586 xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n", 587 hcd->self.busnum, wIndex + 1, port_status); 588 } 589 590 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue, 591 u16 wIndex, __le32 __iomem *addr, u32 port_status) 592 { 593 char *port_change_bit; 594 u32 status; 595 596 switch (wValue) { 597 case USB_PORT_FEAT_C_RESET: 598 status = PORT_RC; 599 port_change_bit = "reset"; 600 break; 601 case USB_PORT_FEAT_C_BH_PORT_RESET: 602 status = PORT_WRC; 603 port_change_bit = "warm(BH) reset"; 604 break; 605 case USB_PORT_FEAT_C_CONNECTION: 606 status = PORT_CSC; 607 port_change_bit = "connect"; 608 break; 609 case USB_PORT_FEAT_C_OVER_CURRENT: 610 status = PORT_OCC; 611 port_change_bit = "over-current"; 612 break; 613 case USB_PORT_FEAT_C_ENABLE: 614 status = PORT_PEC; 615 port_change_bit = "enable/disable"; 616 break; 617 case USB_PORT_FEAT_C_SUSPEND: 618 status = PORT_PLC; 619 port_change_bit = "suspend/resume"; 620 break; 621 case USB_PORT_FEAT_C_PORT_LINK_STATE: 622 status = PORT_PLC; 623 port_change_bit = "link state"; 624 break; 625 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR: 626 status = PORT_CEC; 627 port_change_bit = "config error"; 628 break; 629 default: 630 /* Should never happen */ 631 return; 632 } 633 /* Change bits are all write 1 to clear */ 634 writel(port_status | status, addr); 635 port_status = readl(addr); 636 637 xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n", 638 wIndex + 1, port_change_bit, port_status); 639 } 640 641 struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd) 642 { 643 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 644 645 if (hcd->speed >= HCD_USB3) 646 return &xhci->usb3_rhub; 647 return &xhci->usb2_rhub; 648 } 649 650 /* 651 * xhci_set_port_power() must be called with xhci->lock held. 652 * It will release and re-aquire the lock while calling ACPI 653 * method. 654 */ 655 void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd, 656 u16 index, bool on, unsigned long *flags) 657 __must_hold(&xhci->lock) 658 { 659 struct xhci_hub *rhub; 660 struct xhci_port *port; 661 u32 temp; 662 663 rhub = xhci_get_rhub(hcd); 664 port = rhub->ports[index]; 665 temp = readl(port->addr); 666 667 xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n", 668 hcd->self.busnum, index + 1, on ? "ON" : "OFF", temp); 669 670 temp = xhci_port_state_to_neutral(temp); 671 672 if (on) { 673 /* Power on */ 674 writel(temp | PORT_POWER, port->addr); 675 readl(port->addr); 676 } else { 677 /* Power off */ 678 writel(temp & ~PORT_POWER, port->addr); 679 } 680 681 spin_unlock_irqrestore(&xhci->lock, *flags); 682 temp = usb_acpi_power_manageable(hcd->self.root_hub, 683 index); 684 if (temp) 685 usb_acpi_set_power_state(hcd->self.root_hub, 686 index, on); 687 spin_lock_irqsave(&xhci->lock, *flags); 688 } 689 690 static void xhci_port_set_test_mode(struct xhci_hcd *xhci, 691 u16 test_mode, u16 wIndex) 692 { 693 u32 temp; 694 struct xhci_port *port; 695 696 /* xhci only supports test mode for usb2 ports */ 697 port = xhci->usb2_rhub.ports[wIndex]; 698 temp = readl(port->addr + PORTPMSC); 699 temp |= test_mode << PORT_TEST_MODE_SHIFT; 700 writel(temp, port->addr + PORTPMSC); 701 xhci->test_mode = test_mode; 702 if (test_mode == USB_TEST_FORCE_ENABLE) 703 xhci_start(xhci); 704 } 705 706 static int xhci_enter_test_mode(struct xhci_hcd *xhci, 707 u16 test_mode, u16 wIndex, unsigned long *flags) 708 __must_hold(&xhci->lock) 709 { 710 struct usb_hcd *usb3_hcd = xhci_get_usb3_hcd(xhci); 711 int i, retval; 712 713 /* Disable all Device Slots */ 714 xhci_dbg(xhci, "Disable all slots\n"); 715 spin_unlock_irqrestore(&xhci->lock, *flags); 716 for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) { 717 if (!xhci->devs[i]) 718 continue; 719 720 retval = xhci_disable_slot(xhci, i); 721 xhci_free_virt_device(xhci, i); 722 if (retval) 723 xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n", 724 i, retval); 725 } 726 spin_lock_irqsave(&xhci->lock, *flags); 727 /* Put all ports to the Disable state by clear PP */ 728 xhci_dbg(xhci, "Disable all port (PP = 0)\n"); 729 /* Power off USB3 ports*/ 730 for (i = 0; i < xhci->usb3_rhub.num_ports; i++) 731 xhci_set_port_power(xhci, usb3_hcd, i, false, flags); 732 /* Power off USB2 ports*/ 733 for (i = 0; i < xhci->usb2_rhub.num_ports; i++) 734 xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags); 735 /* Stop the controller */ 736 xhci_dbg(xhci, "Stop controller\n"); 737 retval = xhci_halt(xhci); 738 if (retval) 739 return retval; 740 /* Disable runtime PM for test mode */ 741 pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller); 742 /* Set PORTPMSC.PTC field to enter selected test mode */ 743 /* Port is selected by wIndex. port_id = wIndex + 1 */ 744 xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n", 745 test_mode, wIndex + 1); 746 xhci_port_set_test_mode(xhci, test_mode, wIndex); 747 return retval; 748 } 749 750 static int xhci_exit_test_mode(struct xhci_hcd *xhci) 751 { 752 int retval; 753 754 if (!xhci->test_mode) { 755 xhci_err(xhci, "Not in test mode, do nothing.\n"); 756 return 0; 757 } 758 if (xhci->test_mode == USB_TEST_FORCE_ENABLE && 759 !(xhci->xhc_state & XHCI_STATE_HALTED)) { 760 retval = xhci_halt(xhci); 761 if (retval) 762 return retval; 763 } 764 pm_runtime_allow(xhci_to_hcd(xhci)->self.controller); 765 xhci->test_mode = 0; 766 return xhci_reset(xhci, XHCI_RESET_SHORT_USEC); 767 } 768 769 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port, 770 u32 link_state) 771 { 772 u32 temp; 773 u32 portsc; 774 775 portsc = readl(port->addr); 776 temp = xhci_port_state_to_neutral(portsc); 777 temp &= ~PORT_PLS_MASK; 778 temp |= PORT_LINK_STROBE | link_state; 779 writel(temp, port->addr); 780 781 xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x", 782 port->rhub->hcd->self.busnum, port->hcd_portnum + 1, 783 portsc, temp); 784 } 785 786 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci, 787 struct xhci_port *port, u16 wake_mask) 788 { 789 u32 temp; 790 791 temp = readl(port->addr); 792 temp = xhci_port_state_to_neutral(temp); 793 794 if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT) 795 temp |= PORT_WKCONN_E; 796 else 797 temp &= ~PORT_WKCONN_E; 798 799 if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT) 800 temp |= PORT_WKDISC_E; 801 else 802 temp &= ~PORT_WKDISC_E; 803 804 if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT) 805 temp |= PORT_WKOC_E; 806 else 807 temp &= ~PORT_WKOC_E; 808 809 writel(temp, port->addr); 810 } 811 812 /* Test and clear port RWC bit */ 813 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port, 814 u32 port_bit) 815 { 816 u32 temp; 817 818 temp = readl(port->addr); 819 if (temp & port_bit) { 820 temp = xhci_port_state_to_neutral(temp); 821 temp |= port_bit; 822 writel(temp, port->addr); 823 } 824 } 825 826 /* Updates Link Status for super Speed port */ 827 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci, 828 u32 *status, u32 status_reg) 829 { 830 u32 pls = status_reg & PORT_PLS_MASK; 831 832 /* When the CAS bit is set then warm reset 833 * should be performed on port 834 */ 835 if (status_reg & PORT_CAS) { 836 /* The CAS bit can be set while the port is 837 * in any link state. 838 * Only roothubs have CAS bit, so we 839 * pretend to be in compliance mode 840 * unless we're already in compliance 841 * or the inactive state. 842 */ 843 if (pls != USB_SS_PORT_LS_COMP_MOD && 844 pls != USB_SS_PORT_LS_SS_INACTIVE) { 845 pls = USB_SS_PORT_LS_COMP_MOD; 846 } 847 /* Return also connection bit - 848 * hub state machine resets port 849 * when this bit is set. 850 */ 851 pls |= USB_PORT_STAT_CONNECTION; 852 } else { 853 /* 854 * Resume state is an xHCI internal state. Do not report it to 855 * usb core, instead, pretend to be U3, thus usb core knows 856 * it's not ready for transfer. 857 */ 858 if (pls == XDEV_RESUME) { 859 *status |= USB_SS_PORT_LS_U3; 860 return; 861 } 862 863 /* 864 * If CAS bit isn't set but the Port is already at 865 * Compliance Mode, fake a connection so the USB core 866 * notices the Compliance state and resets the port. 867 * This resolves an issue generated by the SN65LVPE502CP 868 * in which sometimes the port enters compliance mode 869 * caused by a delay on the host-device negotiation. 870 */ 871 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && 872 (pls == USB_SS_PORT_LS_COMP_MOD)) 873 pls |= USB_PORT_STAT_CONNECTION; 874 } 875 876 /* update status field */ 877 *status |= pls; 878 } 879 880 /* 881 * Function for Compliance Mode Quirk. 882 * 883 * This Function verifies if all xhc USB3 ports have entered U0, if so, 884 * the compliance mode timer is deleted. A port won't enter 885 * compliance mode if it has previously entered U0. 886 */ 887 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status, 888 u16 wIndex) 889 { 890 u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1); 891 bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0); 892 893 if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK)) 894 return; 895 896 if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) { 897 xhci->port_status_u0 |= 1 << wIndex; 898 if (xhci->port_status_u0 == all_ports_seen_u0) { 899 del_timer_sync(&xhci->comp_mode_recovery_timer); 900 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, 901 "All USB3 ports have entered U0 already!"); 902 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, 903 "Compliance Mode Recovery Timer Deleted."); 904 } 905 } 906 } 907 908 static int xhci_handle_usb2_port_link_resume(struct xhci_port *port, 909 u32 *status, u32 portsc, 910 unsigned long *flags) 911 { 912 struct xhci_bus_state *bus_state; 913 struct xhci_hcd *xhci; 914 struct usb_hcd *hcd; 915 int slot_id; 916 u32 wIndex; 917 918 hcd = port->rhub->hcd; 919 bus_state = &port->rhub->bus_state; 920 xhci = hcd_to_xhci(hcd); 921 wIndex = port->hcd_portnum; 922 923 if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) { 924 *status = 0xffffffff; 925 return -EINVAL; 926 } 927 /* did port event handler already start resume timing? */ 928 if (!bus_state->resume_done[wIndex]) { 929 /* If not, maybe we are in a host initated resume? */ 930 if (test_bit(wIndex, &bus_state->resuming_ports)) { 931 /* Host initated resume doesn't time the resume 932 * signalling using resume_done[]. 933 * It manually sets RESUME state, sleeps 20ms 934 * and sets U0 state. This should probably be 935 * changed, but not right now. 936 */ 937 } else { 938 /* port resume was discovered now and here, 939 * start resume timing 940 */ 941 unsigned long timeout = jiffies + 942 msecs_to_jiffies(USB_RESUME_TIMEOUT); 943 944 set_bit(wIndex, &bus_state->resuming_ports); 945 bus_state->resume_done[wIndex] = timeout; 946 mod_timer(&hcd->rh_timer, timeout); 947 usb_hcd_start_port_resume(&hcd->self, wIndex); 948 } 949 /* Has resume been signalled for USB_RESUME_TIME yet? */ 950 } else if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) { 951 int time_left; 952 953 xhci_dbg(xhci, "resume USB2 port %d-%d\n", 954 hcd->self.busnum, wIndex + 1); 955 956 bus_state->resume_done[wIndex] = 0; 957 clear_bit(wIndex, &bus_state->resuming_ports); 958 959 set_bit(wIndex, &bus_state->rexit_ports); 960 961 xhci_test_and_clear_bit(xhci, port, PORT_PLC); 962 xhci_set_link_state(xhci, port, XDEV_U0); 963 964 spin_unlock_irqrestore(&xhci->lock, *flags); 965 time_left = wait_for_completion_timeout( 966 &bus_state->rexit_done[wIndex], 967 msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS)); 968 spin_lock_irqsave(&xhci->lock, *flags); 969 970 if (time_left) { 971 slot_id = xhci_find_slot_id_by_port(hcd, xhci, 972 wIndex + 1); 973 if (!slot_id) { 974 xhci_dbg(xhci, "slot_id is zero\n"); 975 *status = 0xffffffff; 976 return -ENODEV; 977 } 978 xhci_ring_device(xhci, slot_id); 979 } else { 980 int port_status = readl(port->addr); 981 982 xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n", 983 hcd->self.busnum, wIndex + 1, port_status); 984 *status |= USB_PORT_STAT_SUSPEND; 985 clear_bit(wIndex, &bus_state->rexit_ports); 986 } 987 988 usb_hcd_end_port_resume(&hcd->self, wIndex); 989 bus_state->port_c_suspend |= 1 << wIndex; 990 bus_state->suspended_ports &= ~(1 << wIndex); 991 } else { 992 /* 993 * The resume has been signaling for less than 994 * USB_RESUME_TIME. Report the port status as SUSPEND, 995 * let the usbcore check port status again and clear 996 * resume signaling later. 997 */ 998 *status |= USB_PORT_STAT_SUSPEND; 999 } 1000 return 0; 1001 } 1002 1003 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li) 1004 { 1005 u32 ext_stat = 0; 1006 int speed_id; 1007 1008 /* only support rx and tx lane counts of 1 in usb3.1 spec */ 1009 speed_id = DEV_PORT_SPEED(raw_port_status); 1010 ext_stat |= speed_id; /* bits 3:0, RX speed id */ 1011 ext_stat |= speed_id << 4; /* bits 7:4, TX speed id */ 1012 1013 ext_stat |= PORT_RX_LANES(port_li) << 8; /* bits 11:8 Rx lane count */ 1014 ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */ 1015 1016 return ext_stat; 1017 } 1018 1019 static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status, 1020 u32 portsc) 1021 { 1022 struct xhci_bus_state *bus_state; 1023 struct xhci_hcd *xhci; 1024 struct usb_hcd *hcd; 1025 u32 link_state; 1026 u32 portnum; 1027 1028 bus_state = &port->rhub->bus_state; 1029 xhci = hcd_to_xhci(port->rhub->hcd); 1030 hcd = port->rhub->hcd; 1031 link_state = portsc & PORT_PLS_MASK; 1032 portnum = port->hcd_portnum; 1033 1034 /* USB3 specific wPortChange bits 1035 * 1036 * Port link change with port in resume state should not be 1037 * reported to usbcore, as this is an internal state to be 1038 * handled by xhci driver. Reporting PLC to usbcore may 1039 * cause usbcore clearing PLC first and port change event 1040 * irq won't be generated. 1041 */ 1042 1043 if (portsc & PORT_PLC && (link_state != XDEV_RESUME)) 1044 *status |= USB_PORT_STAT_C_LINK_STATE << 16; 1045 if (portsc & PORT_WRC) 1046 *status |= USB_PORT_STAT_C_BH_RESET << 16; 1047 if (portsc & PORT_CEC) 1048 *status |= USB_PORT_STAT_C_CONFIG_ERROR << 16; 1049 1050 /* USB3 specific wPortStatus bits */ 1051 if (portsc & PORT_POWER) { 1052 *status |= USB_SS_PORT_STAT_POWER; 1053 /* link state handling */ 1054 if (link_state == XDEV_U0) 1055 bus_state->suspended_ports &= ~(1 << portnum); 1056 } 1057 1058 /* remote wake resume signaling complete */ 1059 if (bus_state->port_remote_wakeup & (1 << portnum) && 1060 link_state != XDEV_RESUME && 1061 link_state != XDEV_RECOVERY) { 1062 bus_state->port_remote_wakeup &= ~(1 << portnum); 1063 usb_hcd_end_port_resume(&hcd->self, portnum); 1064 } 1065 1066 xhci_hub_report_usb3_link_state(xhci, status, portsc); 1067 xhci_del_comp_mod_timer(xhci, portsc, portnum); 1068 } 1069 1070 static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status, 1071 u32 portsc, unsigned long *flags) 1072 { 1073 struct xhci_bus_state *bus_state; 1074 u32 link_state; 1075 u32 portnum; 1076 int ret; 1077 1078 bus_state = &port->rhub->bus_state; 1079 link_state = portsc & PORT_PLS_MASK; 1080 portnum = port->hcd_portnum; 1081 1082 /* USB2 wPortStatus bits */ 1083 if (portsc & PORT_POWER) { 1084 *status |= USB_PORT_STAT_POWER; 1085 1086 /* link state is only valid if port is powered */ 1087 if (link_state == XDEV_U3) 1088 *status |= USB_PORT_STAT_SUSPEND; 1089 if (link_state == XDEV_U2) 1090 *status |= USB_PORT_STAT_L1; 1091 if (link_state == XDEV_U0) { 1092 if (bus_state->resume_done[portnum]) 1093 usb_hcd_end_port_resume(&port->rhub->hcd->self, 1094 portnum); 1095 bus_state->resume_done[portnum] = 0; 1096 clear_bit(portnum, &bus_state->resuming_ports); 1097 if (bus_state->suspended_ports & (1 << portnum)) { 1098 bus_state->suspended_ports &= ~(1 << portnum); 1099 bus_state->port_c_suspend |= 1 << portnum; 1100 } 1101 } 1102 if (link_state == XDEV_RESUME) { 1103 ret = xhci_handle_usb2_port_link_resume(port, status, 1104 portsc, flags); 1105 if (ret) 1106 return; 1107 } 1108 } 1109 } 1110 1111 /* 1112 * Converts a raw xHCI port status into the format that external USB 2.0 or USB 1113 * 3.0 hubs use. 1114 * 1115 * Possible side effects: 1116 * - Mark a port as being done with device resume, 1117 * and ring the endpoint doorbells. 1118 * - Stop the Synopsys redriver Compliance Mode polling. 1119 * - Drop and reacquire the xHCI lock, in order to wait for port resume. 1120 */ 1121 static u32 xhci_get_port_status(struct usb_hcd *hcd, 1122 struct xhci_bus_state *bus_state, 1123 u16 wIndex, u32 raw_port_status, 1124 unsigned long *flags) 1125 __releases(&xhci->lock) 1126 __acquires(&xhci->lock) 1127 { 1128 u32 status = 0; 1129 struct xhci_hub *rhub; 1130 struct xhci_port *port; 1131 1132 rhub = xhci_get_rhub(hcd); 1133 port = rhub->ports[wIndex]; 1134 1135 /* common wPortChange bits */ 1136 if (raw_port_status & PORT_CSC) 1137 status |= USB_PORT_STAT_C_CONNECTION << 16; 1138 if (raw_port_status & PORT_PEC) 1139 status |= USB_PORT_STAT_C_ENABLE << 16; 1140 if ((raw_port_status & PORT_OCC)) 1141 status |= USB_PORT_STAT_C_OVERCURRENT << 16; 1142 if ((raw_port_status & PORT_RC)) 1143 status |= USB_PORT_STAT_C_RESET << 16; 1144 1145 /* common wPortStatus bits */ 1146 if (raw_port_status & PORT_CONNECT) { 1147 status |= USB_PORT_STAT_CONNECTION; 1148 status |= xhci_port_speed(raw_port_status); 1149 } 1150 if (raw_port_status & PORT_PE) 1151 status |= USB_PORT_STAT_ENABLE; 1152 if (raw_port_status & PORT_OC) 1153 status |= USB_PORT_STAT_OVERCURRENT; 1154 if (raw_port_status & PORT_RESET) 1155 status |= USB_PORT_STAT_RESET; 1156 1157 /* USB2 and USB3 specific bits, including Port Link State */ 1158 if (hcd->speed >= HCD_USB3) 1159 xhci_get_usb3_port_status(port, &status, raw_port_status); 1160 else 1161 xhci_get_usb2_port_status(port, &status, raw_port_status, 1162 flags); 1163 /* 1164 * Clear stale usb2 resume signalling variables in case port changed 1165 * state during resume signalling. For example on error 1166 */ 1167 if ((bus_state->resume_done[wIndex] || 1168 test_bit(wIndex, &bus_state->resuming_ports)) && 1169 (raw_port_status & PORT_PLS_MASK) != XDEV_U3 && 1170 (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) { 1171 bus_state->resume_done[wIndex] = 0; 1172 clear_bit(wIndex, &bus_state->resuming_ports); 1173 usb_hcd_end_port_resume(&hcd->self, wIndex); 1174 } 1175 1176 if (bus_state->port_c_suspend & (1 << wIndex)) 1177 status |= USB_PORT_STAT_C_SUSPEND << 16; 1178 1179 return status; 1180 } 1181 1182 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 1183 u16 wIndex, char *buf, u16 wLength) 1184 { 1185 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 1186 int max_ports; 1187 unsigned long flags; 1188 u32 temp, status; 1189 int retval = 0; 1190 int slot_id; 1191 struct xhci_bus_state *bus_state; 1192 u16 link_state = 0; 1193 u16 wake_mask = 0; 1194 u16 timeout = 0; 1195 u16 test_mode = 0; 1196 struct xhci_hub *rhub; 1197 struct xhci_port **ports; 1198 1199 rhub = xhci_get_rhub(hcd); 1200 ports = rhub->ports; 1201 max_ports = rhub->num_ports; 1202 bus_state = &rhub->bus_state; 1203 1204 spin_lock_irqsave(&xhci->lock, flags); 1205 switch (typeReq) { 1206 case GetHubStatus: 1207 /* No power source, over-current reported per port */ 1208 memset(buf, 0, 4); 1209 break; 1210 case GetHubDescriptor: 1211 /* Check to make sure userspace is asking for the USB 3.0 hub 1212 * descriptor for the USB 3.0 roothub. If not, we stall the 1213 * endpoint, like external hubs do. 1214 */ 1215 if (hcd->speed >= HCD_USB3 && 1216 (wLength < USB_DT_SS_HUB_SIZE || 1217 wValue != (USB_DT_SS_HUB << 8))) { 1218 xhci_dbg(xhci, "Wrong hub descriptor type for " 1219 "USB 3.0 roothub.\n"); 1220 goto error; 1221 } 1222 xhci_hub_descriptor(hcd, xhci, 1223 (struct usb_hub_descriptor *) buf); 1224 break; 1225 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 1226 if ((wValue & 0xff00) != (USB_DT_BOS << 8)) 1227 goto error; 1228 1229 if (hcd->speed < HCD_USB3) 1230 goto error; 1231 1232 retval = xhci_create_usb3x_bos_desc(xhci, buf, wLength); 1233 spin_unlock_irqrestore(&xhci->lock, flags); 1234 return retval; 1235 case GetPortStatus: 1236 if (!wIndex || wIndex > max_ports) 1237 goto error; 1238 wIndex--; 1239 temp = readl(ports[wIndex]->addr); 1240 if (temp == ~(u32)0) { 1241 xhci_hc_died(xhci); 1242 retval = -ENODEV; 1243 break; 1244 } 1245 trace_xhci_get_port_status(wIndex, temp); 1246 status = xhci_get_port_status(hcd, bus_state, wIndex, temp, 1247 &flags); 1248 if (status == 0xffffffff) 1249 goto error; 1250 1251 xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x", 1252 hcd->self.busnum, wIndex + 1, temp, status); 1253 1254 put_unaligned(cpu_to_le32(status), (__le32 *) buf); 1255 /* if USB 3.1 extended port status return additional 4 bytes */ 1256 if (wValue == 0x02) { 1257 u32 port_li; 1258 1259 if (hcd->speed < HCD_USB31 || wLength != 8) { 1260 xhci_err(xhci, "get ext port status invalid parameter\n"); 1261 retval = -EINVAL; 1262 break; 1263 } 1264 port_li = readl(ports[wIndex]->addr + PORTLI); 1265 status = xhci_get_ext_port_status(temp, port_li); 1266 put_unaligned_le32(status, &buf[4]); 1267 } 1268 break; 1269 case SetPortFeature: 1270 if (wValue == USB_PORT_FEAT_LINK_STATE) 1271 link_state = (wIndex & 0xff00) >> 3; 1272 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK) 1273 wake_mask = wIndex & 0xff00; 1274 if (wValue == USB_PORT_FEAT_TEST) 1275 test_mode = (wIndex & 0xff00) >> 8; 1276 /* The MSB of wIndex is the U1/U2 timeout */ 1277 timeout = (wIndex & 0xff00) >> 8; 1278 wIndex &= 0xff; 1279 if (!wIndex || wIndex > max_ports) 1280 goto error; 1281 wIndex--; 1282 temp = readl(ports[wIndex]->addr); 1283 if (temp == ~(u32)0) { 1284 xhci_hc_died(xhci); 1285 retval = -ENODEV; 1286 break; 1287 } 1288 temp = xhci_port_state_to_neutral(temp); 1289 /* FIXME: What new port features do we need to support? */ 1290 switch (wValue) { 1291 case USB_PORT_FEAT_SUSPEND: 1292 temp = readl(ports[wIndex]->addr); 1293 if ((temp & PORT_PLS_MASK) != XDEV_U0) { 1294 /* Resume the port to U0 first */ 1295 xhci_set_link_state(xhci, ports[wIndex], 1296 XDEV_U0); 1297 spin_unlock_irqrestore(&xhci->lock, flags); 1298 msleep(10); 1299 spin_lock_irqsave(&xhci->lock, flags); 1300 } 1301 /* In spec software should not attempt to suspend 1302 * a port unless the port reports that it is in the 1303 * enabled (PED = ‘1’,PLS < ‘3’) state. 1304 */ 1305 temp = readl(ports[wIndex]->addr); 1306 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) 1307 || (temp & PORT_PLS_MASK) >= XDEV_U3) { 1308 xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n", 1309 hcd->self.busnum, wIndex + 1); 1310 goto error; 1311 } 1312 1313 slot_id = xhci_find_slot_id_by_port(hcd, xhci, 1314 wIndex + 1); 1315 if (!slot_id) { 1316 xhci_warn(xhci, "slot_id is zero\n"); 1317 goto error; 1318 } 1319 /* unlock to execute stop endpoint commands */ 1320 spin_unlock_irqrestore(&xhci->lock, flags); 1321 xhci_stop_device(xhci, slot_id, 1); 1322 spin_lock_irqsave(&xhci->lock, flags); 1323 1324 xhci_set_link_state(xhci, ports[wIndex], XDEV_U3); 1325 1326 spin_unlock_irqrestore(&xhci->lock, flags); 1327 msleep(10); /* wait device to enter */ 1328 spin_lock_irqsave(&xhci->lock, flags); 1329 1330 temp = readl(ports[wIndex]->addr); 1331 bus_state->suspended_ports |= 1 << wIndex; 1332 break; 1333 case USB_PORT_FEAT_LINK_STATE: 1334 temp = readl(ports[wIndex]->addr); 1335 /* Disable port */ 1336 if (link_state == USB_SS_PORT_LS_SS_DISABLED) { 1337 xhci_dbg(xhci, "Disable port %d-%d\n", 1338 hcd->self.busnum, wIndex + 1); 1339 temp = xhci_port_state_to_neutral(temp); 1340 /* 1341 * Clear all change bits, so that we get a new 1342 * connection event. 1343 */ 1344 temp |= PORT_CSC | PORT_PEC | PORT_WRC | 1345 PORT_OCC | PORT_RC | PORT_PLC | 1346 PORT_CEC; 1347 writel(temp | PORT_PE, ports[wIndex]->addr); 1348 temp = readl(ports[wIndex]->addr); 1349 break; 1350 } 1351 1352 /* Put link in RxDetect (enable port) */ 1353 if (link_state == USB_SS_PORT_LS_RX_DETECT) { 1354 xhci_dbg(xhci, "Enable port %d-%d\n", 1355 hcd->self.busnum, wIndex + 1); 1356 xhci_set_link_state(xhci, ports[wIndex], 1357 link_state); 1358 temp = readl(ports[wIndex]->addr); 1359 break; 1360 } 1361 1362 /* 1363 * For xHCI 1.1 according to section 4.19.1.2.4.1 a 1364 * root hub port's transition to compliance mode upon 1365 * detecting LFPS timeout may be controlled by an 1366 * Compliance Transition Enabled (CTE) flag (not 1367 * software visible). This flag is set by writing 0xA 1368 * to PORTSC PLS field which will allow transition to 1369 * compliance mode the next time LFPS timeout is 1370 * encountered. A warm reset will clear it. 1371 * 1372 * The CTE flag is only supported if the HCCPARAMS2 CTC 1373 * flag is set, otherwise, the compliance substate is 1374 * automatically entered as on 1.0 and prior. 1375 */ 1376 if (link_state == USB_SS_PORT_LS_COMP_MOD) { 1377 if (!HCC2_CTC(xhci->hcc_params2)) { 1378 xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n"); 1379 break; 1380 } 1381 1382 if ((temp & PORT_CONNECT)) { 1383 xhci_warn(xhci, "Can't set compliance mode when port is connected\n"); 1384 goto error; 1385 } 1386 1387 xhci_dbg(xhci, "Enable compliance mode transition for port %d-%d\n", 1388 hcd->self.busnum, wIndex + 1); 1389 xhci_set_link_state(xhci, ports[wIndex], 1390 link_state); 1391 1392 temp = readl(ports[wIndex]->addr); 1393 break; 1394 } 1395 /* Port must be enabled */ 1396 if (!(temp & PORT_PE)) { 1397 retval = -ENODEV; 1398 break; 1399 } 1400 /* Can't set port link state above '3' (U3) */ 1401 if (link_state > USB_SS_PORT_LS_U3) { 1402 xhci_warn(xhci, "Cannot set port %d-%d link state %d\n", 1403 hcd->self.busnum, wIndex + 1, 1404 link_state); 1405 goto error; 1406 } 1407 1408 /* 1409 * set link to U0, steps depend on current link state. 1410 * U3: set link to U0 and wait for u3exit completion. 1411 * U1/U2: no PLC complete event, only set link to U0. 1412 * Resume/Recovery: device initiated U0, only wait for 1413 * completion 1414 */ 1415 if (link_state == USB_SS_PORT_LS_U0) { 1416 u32 pls = temp & PORT_PLS_MASK; 1417 bool wait_u0 = false; 1418 1419 /* already in U0 */ 1420 if (pls == XDEV_U0) 1421 break; 1422 if (pls == XDEV_U3 || 1423 pls == XDEV_RESUME || 1424 pls == XDEV_RECOVERY) { 1425 wait_u0 = true; 1426 reinit_completion(&bus_state->u3exit_done[wIndex]); 1427 } 1428 if (pls <= XDEV_U3) /* U1, U2, U3 */ 1429 xhci_set_link_state(xhci, ports[wIndex], 1430 USB_SS_PORT_LS_U0); 1431 if (!wait_u0) { 1432 if (pls > XDEV_U3) 1433 goto error; 1434 break; 1435 } 1436 spin_unlock_irqrestore(&xhci->lock, flags); 1437 if (!wait_for_completion_timeout(&bus_state->u3exit_done[wIndex], 1438 msecs_to_jiffies(500))) 1439 xhci_dbg(xhci, "missing U0 port change event for port %d-%d\n", 1440 hcd->self.busnum, wIndex + 1); 1441 spin_lock_irqsave(&xhci->lock, flags); 1442 temp = readl(ports[wIndex]->addr); 1443 break; 1444 } 1445 1446 if (link_state == USB_SS_PORT_LS_U3) { 1447 int retries = 16; 1448 slot_id = xhci_find_slot_id_by_port(hcd, xhci, 1449 wIndex + 1); 1450 if (slot_id) { 1451 /* unlock to execute stop endpoint 1452 * commands */ 1453 spin_unlock_irqrestore(&xhci->lock, 1454 flags); 1455 xhci_stop_device(xhci, slot_id, 1); 1456 spin_lock_irqsave(&xhci->lock, flags); 1457 } 1458 xhci_set_link_state(xhci, ports[wIndex], USB_SS_PORT_LS_U3); 1459 spin_unlock_irqrestore(&xhci->lock, flags); 1460 while (retries--) { 1461 usleep_range(4000, 8000); 1462 temp = readl(ports[wIndex]->addr); 1463 if ((temp & PORT_PLS_MASK) == XDEV_U3) 1464 break; 1465 } 1466 spin_lock_irqsave(&xhci->lock, flags); 1467 temp = readl(ports[wIndex]->addr); 1468 bus_state->suspended_ports |= 1 << wIndex; 1469 } 1470 break; 1471 case USB_PORT_FEAT_POWER: 1472 /* 1473 * Turn on ports, even if there isn't per-port switching. 1474 * HC will report connect events even before this is set. 1475 * However, hub_wq will ignore the roothub events until 1476 * the roothub is registered. 1477 */ 1478 xhci_set_port_power(xhci, hcd, wIndex, true, &flags); 1479 break; 1480 case USB_PORT_FEAT_RESET: 1481 temp = (temp | PORT_RESET); 1482 writel(temp, ports[wIndex]->addr); 1483 1484 temp = readl(ports[wIndex]->addr); 1485 xhci_dbg(xhci, "set port reset, actual port %d-%d status = 0x%x\n", 1486 hcd->self.busnum, wIndex + 1, temp); 1487 break; 1488 case USB_PORT_FEAT_REMOTE_WAKE_MASK: 1489 xhci_set_remote_wake_mask(xhci, ports[wIndex], 1490 wake_mask); 1491 temp = readl(ports[wIndex]->addr); 1492 xhci_dbg(xhci, "set port remote wake mask, actual port %d-%d status = 0x%x\n", 1493 hcd->self.busnum, wIndex + 1, temp); 1494 break; 1495 case USB_PORT_FEAT_BH_PORT_RESET: 1496 temp |= PORT_WR; 1497 writel(temp, ports[wIndex]->addr); 1498 temp = readl(ports[wIndex]->addr); 1499 break; 1500 case USB_PORT_FEAT_U1_TIMEOUT: 1501 if (hcd->speed < HCD_USB3) 1502 goto error; 1503 temp = readl(ports[wIndex]->addr + PORTPMSC); 1504 temp &= ~PORT_U1_TIMEOUT_MASK; 1505 temp |= PORT_U1_TIMEOUT(timeout); 1506 writel(temp, ports[wIndex]->addr + PORTPMSC); 1507 break; 1508 case USB_PORT_FEAT_U2_TIMEOUT: 1509 if (hcd->speed < HCD_USB3) 1510 goto error; 1511 temp = readl(ports[wIndex]->addr + PORTPMSC); 1512 temp &= ~PORT_U2_TIMEOUT_MASK; 1513 temp |= PORT_U2_TIMEOUT(timeout); 1514 writel(temp, ports[wIndex]->addr + PORTPMSC); 1515 break; 1516 case USB_PORT_FEAT_TEST: 1517 /* 4.19.6 Port Test Modes (USB2 Test Mode) */ 1518 if (hcd->speed != HCD_USB2) 1519 goto error; 1520 if (test_mode > USB_TEST_FORCE_ENABLE || 1521 test_mode < USB_TEST_J) 1522 goto error; 1523 retval = xhci_enter_test_mode(xhci, test_mode, wIndex, 1524 &flags); 1525 break; 1526 default: 1527 goto error; 1528 } 1529 /* unblock any posted writes */ 1530 temp = readl(ports[wIndex]->addr); 1531 break; 1532 case ClearPortFeature: 1533 if (!wIndex || wIndex > max_ports) 1534 goto error; 1535 wIndex--; 1536 temp = readl(ports[wIndex]->addr); 1537 if (temp == ~(u32)0) { 1538 xhci_hc_died(xhci); 1539 retval = -ENODEV; 1540 break; 1541 } 1542 /* FIXME: What new port features do we need to support? */ 1543 temp = xhci_port_state_to_neutral(temp); 1544 switch (wValue) { 1545 case USB_PORT_FEAT_SUSPEND: 1546 temp = readl(ports[wIndex]->addr); 1547 xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n"); 1548 xhci_dbg(xhci, "PORTSC %04x\n", temp); 1549 if (temp & PORT_RESET) 1550 goto error; 1551 if ((temp & PORT_PLS_MASK) == XDEV_U3) { 1552 if ((temp & PORT_PE) == 0) 1553 goto error; 1554 1555 set_bit(wIndex, &bus_state->resuming_ports); 1556 usb_hcd_start_port_resume(&hcd->self, wIndex); 1557 xhci_set_link_state(xhci, ports[wIndex], 1558 XDEV_RESUME); 1559 spin_unlock_irqrestore(&xhci->lock, flags); 1560 msleep(USB_RESUME_TIMEOUT); 1561 spin_lock_irqsave(&xhci->lock, flags); 1562 xhci_set_link_state(xhci, ports[wIndex], 1563 XDEV_U0); 1564 clear_bit(wIndex, &bus_state->resuming_ports); 1565 usb_hcd_end_port_resume(&hcd->self, wIndex); 1566 } 1567 bus_state->port_c_suspend |= 1 << wIndex; 1568 1569 slot_id = xhci_find_slot_id_by_port(hcd, xhci, 1570 wIndex + 1); 1571 if (!slot_id) { 1572 xhci_dbg(xhci, "slot_id is zero\n"); 1573 goto error; 1574 } 1575 xhci_ring_device(xhci, slot_id); 1576 break; 1577 case USB_PORT_FEAT_C_SUSPEND: 1578 bus_state->port_c_suspend &= ~(1 << wIndex); 1579 fallthrough; 1580 case USB_PORT_FEAT_C_RESET: 1581 case USB_PORT_FEAT_C_BH_PORT_RESET: 1582 case USB_PORT_FEAT_C_CONNECTION: 1583 case USB_PORT_FEAT_C_OVER_CURRENT: 1584 case USB_PORT_FEAT_C_ENABLE: 1585 case USB_PORT_FEAT_C_PORT_LINK_STATE: 1586 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR: 1587 xhci_clear_port_change_bit(xhci, wValue, wIndex, 1588 ports[wIndex]->addr, temp); 1589 break; 1590 case USB_PORT_FEAT_ENABLE: 1591 xhci_disable_port(hcd, xhci, wIndex, 1592 ports[wIndex]->addr, temp); 1593 break; 1594 case USB_PORT_FEAT_POWER: 1595 xhci_set_port_power(xhci, hcd, wIndex, false, &flags); 1596 break; 1597 case USB_PORT_FEAT_TEST: 1598 retval = xhci_exit_test_mode(xhci); 1599 break; 1600 default: 1601 goto error; 1602 } 1603 break; 1604 default: 1605 error: 1606 /* "stall" on error */ 1607 retval = -EPIPE; 1608 } 1609 spin_unlock_irqrestore(&xhci->lock, flags); 1610 return retval; 1611 } 1612 1613 /* 1614 * Returns 0 if the status hasn't changed, or the number of bytes in buf. 1615 * Ports are 0-indexed from the HCD point of view, 1616 * and 1-indexed from the USB core pointer of view. 1617 * 1618 * Note that the status change bits will be cleared as soon as a port status 1619 * change event is generated, so we use the saved status from that event. 1620 */ 1621 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf) 1622 { 1623 unsigned long flags; 1624 u32 temp, status; 1625 u32 mask; 1626 int i, retval; 1627 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 1628 int max_ports; 1629 struct xhci_bus_state *bus_state; 1630 bool reset_change = false; 1631 struct xhci_hub *rhub; 1632 struct xhci_port **ports; 1633 1634 rhub = xhci_get_rhub(hcd); 1635 ports = rhub->ports; 1636 max_ports = rhub->num_ports; 1637 bus_state = &rhub->bus_state; 1638 1639 /* Initial status is no changes */ 1640 retval = (max_ports + 8) / 8; 1641 memset(buf, 0, retval); 1642 1643 /* 1644 * Inform the usbcore about resume-in-progress by returning 1645 * a non-zero value even if there are no status changes. 1646 */ 1647 spin_lock_irqsave(&xhci->lock, flags); 1648 1649 status = bus_state->resuming_ports; 1650 1651 mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC; 1652 1653 /* For each port, did anything change? If so, set that bit in buf. */ 1654 for (i = 0; i < max_ports; i++) { 1655 temp = readl(ports[i]->addr); 1656 if (temp == ~(u32)0) { 1657 xhci_hc_died(xhci); 1658 retval = -ENODEV; 1659 break; 1660 } 1661 trace_xhci_hub_status_data(i, temp); 1662 1663 if ((temp & mask) != 0 || 1664 (bus_state->port_c_suspend & 1 << i) || 1665 (bus_state->resume_done[i] && time_after_eq( 1666 jiffies, bus_state->resume_done[i]))) { 1667 buf[(i + 1) / 8] |= 1 << (i + 1) % 8; 1668 status = 1; 1669 } 1670 if ((temp & PORT_RC)) 1671 reset_change = true; 1672 if (temp & PORT_OC) 1673 status = 1; 1674 } 1675 if (!status && !reset_change) { 1676 xhci_dbg(xhci, "%s: stopping usb%d port polling\n", 1677 __func__, hcd->self.busnum); 1678 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 1679 } 1680 spin_unlock_irqrestore(&xhci->lock, flags); 1681 return status ? retval : 0; 1682 } 1683 1684 #ifdef CONFIG_PM 1685 1686 int xhci_bus_suspend(struct usb_hcd *hcd) 1687 { 1688 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 1689 int max_ports, port_index; 1690 struct xhci_bus_state *bus_state; 1691 unsigned long flags; 1692 struct xhci_hub *rhub; 1693 struct xhci_port **ports; 1694 u32 portsc_buf[USB_MAXCHILDREN]; 1695 bool wake_enabled; 1696 1697 rhub = xhci_get_rhub(hcd); 1698 ports = rhub->ports; 1699 max_ports = rhub->num_ports; 1700 bus_state = &rhub->bus_state; 1701 wake_enabled = hcd->self.root_hub->do_remote_wakeup; 1702 1703 spin_lock_irqsave(&xhci->lock, flags); 1704 1705 if (wake_enabled) { 1706 if (bus_state->resuming_ports || /* USB2 */ 1707 bus_state->port_remote_wakeup) { /* USB3 */ 1708 spin_unlock_irqrestore(&xhci->lock, flags); 1709 xhci_dbg(xhci, "usb%d bus suspend to fail because a port is resuming\n", 1710 hcd->self.busnum); 1711 return -EBUSY; 1712 } 1713 } 1714 /* 1715 * Prepare ports for suspend, but don't write anything before all ports 1716 * are checked and we know bus suspend can proceed 1717 */ 1718 bus_state->bus_suspended = 0; 1719 port_index = max_ports; 1720 while (port_index--) { 1721 u32 t1, t2; 1722 int retries = 10; 1723 retry: 1724 t1 = readl(ports[port_index]->addr); 1725 t2 = xhci_port_state_to_neutral(t1); 1726 portsc_buf[port_index] = 0; 1727 1728 /* 1729 * Give a USB3 port in link training time to finish, but don't 1730 * prevent suspend as port might be stuck 1731 */ 1732 if ((hcd->speed >= HCD_USB3) && retries-- && 1733 (t1 & PORT_PLS_MASK) == XDEV_POLLING) { 1734 spin_unlock_irqrestore(&xhci->lock, flags); 1735 msleep(XHCI_PORT_POLLING_LFPS_TIME); 1736 spin_lock_irqsave(&xhci->lock, flags); 1737 xhci_dbg(xhci, "port %d-%d polling in bus suspend, waiting\n", 1738 hcd->self.busnum, port_index + 1); 1739 goto retry; 1740 } 1741 /* bail out if port detected a over-current condition */ 1742 if (t1 & PORT_OC) { 1743 bus_state->bus_suspended = 0; 1744 spin_unlock_irqrestore(&xhci->lock, flags); 1745 xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n"); 1746 return -EBUSY; 1747 } 1748 /* suspend ports in U0, or bail out for new connect changes */ 1749 if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) { 1750 if ((t1 & PORT_CSC) && wake_enabled) { 1751 bus_state->bus_suspended = 0; 1752 spin_unlock_irqrestore(&xhci->lock, flags); 1753 xhci_dbg(xhci, "Bus suspend bailout, port connect change\n"); 1754 return -EBUSY; 1755 } 1756 xhci_dbg(xhci, "port %d-%d not suspended\n", 1757 hcd->self.busnum, port_index + 1); 1758 t2 &= ~PORT_PLS_MASK; 1759 t2 |= PORT_LINK_STROBE | XDEV_U3; 1760 set_bit(port_index, &bus_state->bus_suspended); 1761 } 1762 /* USB core sets remote wake mask for USB 3.0 hubs, 1763 * including the USB 3.0 roothub, but only if CONFIG_PM 1764 * is enabled, so also enable remote wake here. 1765 */ 1766 if (wake_enabled) { 1767 if (t1 & PORT_CONNECT) { 1768 t2 |= PORT_WKOC_E | PORT_WKDISC_E; 1769 t2 &= ~PORT_WKCONN_E; 1770 } else { 1771 t2 |= PORT_WKOC_E | PORT_WKCONN_E; 1772 t2 &= ~PORT_WKDISC_E; 1773 } 1774 1775 if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) && 1776 (hcd->speed < HCD_USB3)) { 1777 if (usb_amd_pt_check_port(hcd->self.controller, 1778 port_index)) 1779 t2 &= ~PORT_WAKE_BITS; 1780 } 1781 } else 1782 t2 &= ~PORT_WAKE_BITS; 1783 1784 t1 = xhci_port_state_to_neutral(t1); 1785 if (t1 != t2) 1786 portsc_buf[port_index] = t2; 1787 } 1788 1789 /* write port settings, stopping and suspending ports if needed */ 1790 port_index = max_ports; 1791 while (port_index--) { 1792 if (!portsc_buf[port_index]) 1793 continue; 1794 if (test_bit(port_index, &bus_state->bus_suspended)) { 1795 int slot_id; 1796 1797 slot_id = xhci_find_slot_id_by_port(hcd, xhci, 1798 port_index + 1); 1799 if (slot_id) { 1800 spin_unlock_irqrestore(&xhci->lock, flags); 1801 xhci_stop_device(xhci, slot_id, 1); 1802 spin_lock_irqsave(&xhci->lock, flags); 1803 } 1804 } 1805 writel(portsc_buf[port_index], ports[port_index]->addr); 1806 } 1807 hcd->state = HC_STATE_SUSPENDED; 1808 bus_state->next_statechange = jiffies + msecs_to_jiffies(10); 1809 spin_unlock_irqrestore(&xhci->lock, flags); 1810 1811 if (bus_state->bus_suspended) 1812 usleep_range(5000, 10000); 1813 1814 return 0; 1815 } 1816 1817 /* 1818 * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3. 1819 * warm reset a USB3 device stuck in polling or compliance mode after resume. 1820 * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8 1821 */ 1822 static bool xhci_port_missing_cas_quirk(struct xhci_port *port) 1823 { 1824 u32 portsc; 1825 1826 portsc = readl(port->addr); 1827 1828 /* if any of these are set we are not stuck */ 1829 if (portsc & (PORT_CONNECT | PORT_CAS)) 1830 return false; 1831 1832 if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) && 1833 ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE)) 1834 return false; 1835 1836 /* clear wakeup/change bits, and do a warm port reset */ 1837 portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); 1838 portsc |= PORT_WR; 1839 writel(portsc, port->addr); 1840 /* flush write */ 1841 readl(port->addr); 1842 return true; 1843 } 1844 1845 int xhci_bus_resume(struct usb_hcd *hcd) 1846 { 1847 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 1848 struct xhci_bus_state *bus_state; 1849 unsigned long flags; 1850 int max_ports, port_index; 1851 int slot_id; 1852 int sret; 1853 u32 next_state; 1854 u32 temp, portsc; 1855 struct xhci_hub *rhub; 1856 struct xhci_port **ports; 1857 1858 rhub = xhci_get_rhub(hcd); 1859 ports = rhub->ports; 1860 max_ports = rhub->num_ports; 1861 bus_state = &rhub->bus_state; 1862 1863 if (time_before(jiffies, bus_state->next_statechange)) 1864 msleep(5); 1865 1866 spin_lock_irqsave(&xhci->lock, flags); 1867 if (!HCD_HW_ACCESSIBLE(hcd)) { 1868 spin_unlock_irqrestore(&xhci->lock, flags); 1869 return -ESHUTDOWN; 1870 } 1871 1872 /* delay the irqs */ 1873 temp = readl(&xhci->op_regs->command); 1874 temp &= ~CMD_EIE; 1875 writel(temp, &xhci->op_regs->command); 1876 1877 /* bus specific resume for ports we suspended at bus_suspend */ 1878 if (hcd->speed >= HCD_USB3) 1879 next_state = XDEV_U0; 1880 else 1881 next_state = XDEV_RESUME; 1882 1883 port_index = max_ports; 1884 while (port_index--) { 1885 portsc = readl(ports[port_index]->addr); 1886 1887 /* warm reset CAS limited ports stuck in polling/compliance */ 1888 if ((xhci->quirks & XHCI_MISSING_CAS) && 1889 (hcd->speed >= HCD_USB3) && 1890 xhci_port_missing_cas_quirk(ports[port_index])) { 1891 xhci_dbg(xhci, "reset stuck port %d-%d\n", 1892 hcd->self.busnum, port_index + 1); 1893 clear_bit(port_index, &bus_state->bus_suspended); 1894 continue; 1895 } 1896 /* resume if we suspended the link, and it is still suspended */ 1897 if (test_bit(port_index, &bus_state->bus_suspended)) 1898 switch (portsc & PORT_PLS_MASK) { 1899 case XDEV_U3: 1900 portsc = xhci_port_state_to_neutral(portsc); 1901 portsc &= ~PORT_PLS_MASK; 1902 portsc |= PORT_LINK_STROBE | next_state; 1903 break; 1904 case XDEV_RESUME: 1905 /* resume already initiated */ 1906 break; 1907 default: 1908 /* not in a resumeable state, ignore it */ 1909 clear_bit(port_index, 1910 &bus_state->bus_suspended); 1911 break; 1912 } 1913 /* disable wake for all ports, write new link state if needed */ 1914 portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); 1915 writel(portsc, ports[port_index]->addr); 1916 } 1917 1918 /* USB2 specific resume signaling delay and U0 link state transition */ 1919 if (hcd->speed < HCD_USB3) { 1920 if (bus_state->bus_suspended) { 1921 spin_unlock_irqrestore(&xhci->lock, flags); 1922 msleep(USB_RESUME_TIMEOUT); 1923 spin_lock_irqsave(&xhci->lock, flags); 1924 } 1925 for_each_set_bit(port_index, &bus_state->bus_suspended, 1926 BITS_PER_LONG) { 1927 /* Clear PLC to poll it later for U0 transition */ 1928 xhci_test_and_clear_bit(xhci, ports[port_index], 1929 PORT_PLC); 1930 xhci_set_link_state(xhci, ports[port_index], XDEV_U0); 1931 } 1932 } 1933 1934 /* poll for U0 link state complete, both USB2 and USB3 */ 1935 for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) { 1936 sret = xhci_handshake(ports[port_index]->addr, PORT_PLC, 1937 PORT_PLC, 10 * 1000); 1938 if (sret) { 1939 xhci_warn(xhci, "port %d-%d resume PLC timeout\n", 1940 hcd->self.busnum, port_index + 1); 1941 continue; 1942 } 1943 xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC); 1944 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1); 1945 if (slot_id) 1946 xhci_ring_device(xhci, slot_id); 1947 } 1948 (void) readl(&xhci->op_regs->command); 1949 1950 bus_state->next_statechange = jiffies + msecs_to_jiffies(5); 1951 /* re-enable irqs */ 1952 temp = readl(&xhci->op_regs->command); 1953 temp |= CMD_EIE; 1954 writel(temp, &xhci->op_regs->command); 1955 temp = readl(&xhci->op_regs->command); 1956 1957 spin_unlock_irqrestore(&xhci->lock, flags); 1958 return 0; 1959 } 1960 1961 unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd) 1962 { 1963 struct xhci_hub *rhub = xhci_get_rhub(hcd); 1964 1965 /* USB3 port wakeups are reported via usb_wakeup_notification() */ 1966 return rhub->bus_state.resuming_ports; /* USB2 ports only */ 1967 } 1968 1969 #endif /* CONFIG_PM */ 1970