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 */
  24static 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
  35static 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	}
 245out:
 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
 255static 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 */
 278static 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 */
 333static 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
 366static 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
 377static unsigned int xhci_port_speed(unsigned int port_status)
 378{
 379	if (DEV_LOWSPEED(port_status))
 380		return USB_PORT_STAT_LOW_SPEED;
 381	if (DEV_HIGHSPEED(port_status))
 382		return USB_PORT_STAT_HIGH_SPEED;
 383	/*
 384	 * FIXME: Yes, we should check for full speed, but the core uses that as
 385	 * a default in portspeed() in usb/core/hub.c (which is the only place
 386	 * USB_PORT_STAT_*_SPEED is used).
 387	 */
 388	return 0;
 389}
 390
 391/*
 392 * These bits are Read Only (RO) and should be saved and written to the
 393 * registers: 0, 3, 10:13, 30
 394 * connect status, over-current status, port speed, and device removable.
 395 * connect status and port speed are also sticky - meaning they're in
 396 * the AUX well and they aren't changed by a hot, warm, or cold reset.
 397 */
 398#define	XHCI_PORT_RO	((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 399/*
 400 * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 401 * bits 5:8, 9, 14:15, 25:27
 402 * link state, port power, port indicator state, "wake on" enable state
 403 */
 404#define XHCI_PORT_RWS	((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 405/*
 406 * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 407 * bit 4 (port reset)
 408 */
 409#define	XHCI_PORT_RW1S	((1<<4))
 410/*
 411 * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 412 * bits 1, 17, 18, 19, 20, 21, 22, 23
 413 * port enable/disable, and
 414 * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 415 * over-current, reset, link state, and L1 change
 416 */
 417#define XHCI_PORT_RW1CS	((1<<1) | (0x7f<<17))
 418/*
 419 * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 420 * latched in
 421 */
 422#define	XHCI_PORT_RW	((1<<16))
 423/*
 424 * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 425 * bits 2, 24, 28:31
 426 */
 427#define	XHCI_PORT_RZ	((1<<2) | (1<<24) | (0xf<<28))
 428
 429/**
 430 * xhci_port_state_to_neutral() - Clean up read portsc value back into writeable
 431 * @state: u32 port value read from portsc register to be cleanup up
 432 *
 433 * Given a port state, this function returns a value that would result in the
 434 * port being in the same state, if the value was written to the port status
 435 * control register.
 436 * Save Read Only (RO) bits and save read/write bits where
 437 * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 438 * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 439 *
 440 * Return: u32 value that can be written back to portsc register without
 441 * changing port state.
 442 */
 443
 444u32 xhci_port_state_to_neutral(u32 state)
 445{
 446	/* Save read-only status and port state */
 447	return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 448}
 449EXPORT_SYMBOL_GPL(xhci_port_state_to_neutral);
 450
 451/**
 452 * xhci_find_slot_id_by_port() - Find slot id of a usb device on a roothub port
 453 * @hcd: pointer to hcd of the roothub
 454 * @xhci: pointer to xhci structure
 455 * @port: one-based port number of the port in this roothub.
 456 *
 457 * Return: Slot id of the usb device connected to the root port, 0 if not found
 458 */
 459
 460int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 461		u16 port)
 462{
 463	int slot_id;
 464	int i;
 465	enum usb_device_speed speed;
 466
 467	slot_id = 0;
 468	for (i = 0; i < MAX_HC_SLOTS; i++) {
 469		if (!xhci->devs[i] || !xhci->devs[i]->udev)
 470			continue;
 471		speed = xhci->devs[i]->udev->speed;
 472		if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
 473				&& xhci->devs[i]->fake_port == port) {
 474			slot_id = i;
 475			break;
 476		}
 477	}
 478
 479	return slot_id;
 480}
 481EXPORT_SYMBOL_GPL(xhci_find_slot_id_by_port);
 482
 483/*
 484 * Stop device
 485 * It issues stop endpoint command for EP 0 to 30. And wait the last command
 486 * to complete.
 487 * suspend will set to 1, if suspend bit need to set in command.
 488 */
 489static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 490{
 491	struct xhci_virt_device *virt_dev;
 492	struct xhci_command *cmd;
 493	unsigned long flags;
 494	int ret;
 495	int i;
 496
 497	ret = 0;
 498	virt_dev = xhci->devs[slot_id];
 499	if (!virt_dev)
 500		return -ENODEV;
 501
 502	trace_xhci_stop_device(virt_dev);
 503
 504	cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
 505	if (!cmd)
 506		return -ENOMEM;
 507
 508	spin_lock_irqsave(&xhci->lock, flags);
 509	for (i = LAST_EP_INDEX; i > 0; i--) {
 510		if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 511			struct xhci_ep_ctx *ep_ctx;
 512			struct xhci_command *command;
 513
 514			ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i);
 515
 516			/* Check ep is running, required by AMD SNPS 3.1 xHC */
 517			if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING)
 518				continue;
 519
 520			command = xhci_alloc_command(xhci, false, GFP_NOWAIT);
 521			if (!command) {
 522				spin_unlock_irqrestore(&xhci->lock, flags);
 523				ret = -ENOMEM;
 524				goto cmd_cleanup;
 525			}
 526
 527			ret = xhci_queue_stop_endpoint(xhci, command, slot_id,
 528						       i, suspend);
 529			if (ret) {
 530				spin_unlock_irqrestore(&xhci->lock, flags);
 531				xhci_free_command(xhci, command);
 532				goto cmd_cleanup;
 533			}
 534		}
 535	}
 536	ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 537	if (ret) {
 538		spin_unlock_irqrestore(&xhci->lock, flags);
 539		goto cmd_cleanup;
 540	}
 541
 542	xhci_ring_cmd_db(xhci);
 543	spin_unlock_irqrestore(&xhci->lock, flags);
 544
 545	/* Wait for last stop endpoint command to finish */
 546	wait_for_completion(cmd->completion);
 547
 548	if (cmd->status == COMP_COMMAND_ABORTED ||
 549	    cmd->status == COMP_COMMAND_RING_STOPPED) {
 550		xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 551		ret = -ETIME;
 552	}
 553
 554cmd_cleanup:
 555	xhci_free_command(xhci, cmd);
 556	return ret;
 557}
 558
 559/*
 560 * Ring device, it rings the all doorbells unconditionally.
 561 */
 562void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 563{
 564	int i, s;
 565	struct xhci_virt_ep *ep;
 566
 567	for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 568		ep = &xhci->devs[slot_id]->eps[i];
 569
 570		if (ep->ep_state & EP_HAS_STREAMS) {
 571			for (s = 1; s < ep->stream_info->num_streams; s++)
 572				xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 573		} else if (ep->ring && ep->ring->dequeue) {
 574			xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 575		}
 576	}
 577
 578	return;
 579}
 580
 581static void xhci_disable_port(struct xhci_hcd *xhci, struct xhci_port *port)
 582{
 583	struct usb_hcd *hcd;
 584	u32 portsc;
 585
 586	hcd = port->rhub->hcd;
 587
 588	/* Don't allow the USB core to disable SuperSpeed ports. */
 589	if (hcd->speed >= HCD_USB3) {
 590		xhci_dbg(xhci, "Ignoring request to disable SuperSpeed port.\n");
 591		return;
 592	}
 593
 594	if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
 595		xhci_dbg(xhci,
 596			 "Broken Port Enabled/Disabled, ignoring port disable request.\n");
 597		return;
 598	}
 599
 600	portsc = readl(port->addr);
 601	portsc = xhci_port_state_to_neutral(portsc);
 602
 603	/* Write 1 to disable the port */
 604	writel(portsc | PORT_PE, port->addr);
 605
 606	portsc = readl(port->addr);
 607	xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n",
 608		 hcd->self.busnum, port->hcd_portnum + 1, portsc);
 609}
 610
 611static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 612		u16 wIndex, __le32 __iomem *addr, u32 port_status)
 613{
 614	char *port_change_bit;
 615	u32 status;
 616
 617	switch (wValue) {
 618	case USB_PORT_FEAT_C_RESET:
 619		status = PORT_RC;
 620		port_change_bit = "reset";
 621		break;
 622	case USB_PORT_FEAT_C_BH_PORT_RESET:
 623		status = PORT_WRC;
 624		port_change_bit = "warm(BH) reset";
 625		break;
 626	case USB_PORT_FEAT_C_CONNECTION:
 627		status = PORT_CSC;
 628		port_change_bit = "connect";
 629		break;
 630	case USB_PORT_FEAT_C_OVER_CURRENT:
 631		status = PORT_OCC;
 632		port_change_bit = "over-current";
 633		break;
 634	case USB_PORT_FEAT_C_ENABLE:
 635		status = PORT_PEC;
 636		port_change_bit = "enable/disable";
 637		break;
 638	case USB_PORT_FEAT_C_SUSPEND:
 639		status = PORT_PLC;
 640		port_change_bit = "suspend/resume";
 641		break;
 642	case USB_PORT_FEAT_C_PORT_LINK_STATE:
 643		status = PORT_PLC;
 644		port_change_bit = "link state";
 645		break;
 646	case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 647		status = PORT_CEC;
 648		port_change_bit = "config error";
 649		break;
 650	default:
 651		/* Should never happen */
 652		return;
 653	}
 654	/* Change bits are all write 1 to clear */
 655	writel(port_status | status, addr);
 656	port_status = readl(addr);
 657
 658	xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n",
 659		 wIndex + 1, port_change_bit, port_status);
 660}
 661
 662struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
 663{
 664	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 665
 666	if (hcd->speed >= HCD_USB3)
 667		return &xhci->usb3_rhub;
 668	return &xhci->usb2_rhub;
 669}
 670
 671/*
 672 * xhci_set_port_power() must be called with xhci->lock held.
 673 * It will release and re-aquire the lock while calling ACPI
 674 * method.
 675 */
 676static void xhci_set_port_power(struct xhci_hcd *xhci, struct xhci_port *port,
 677				bool on, unsigned long *flags)
 678	__must_hold(&xhci->lock)
 679{
 680	struct usb_hcd *hcd;
 681	u32 temp;
 682
 683	hcd = port->rhub->hcd;
 684	temp = readl(port->addr);
 685
 686	xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n",
 687		 hcd->self.busnum, port->hcd_portnum + 1, on ? "ON" : "OFF", temp);
 688
 689	temp = xhci_port_state_to_neutral(temp);
 690
 691	if (on) {
 692		/* Power on */
 693		writel(temp | PORT_POWER, port->addr);
 694		readl(port->addr);
 695	} else {
 696		/* Power off */
 697		writel(temp & ~PORT_POWER, port->addr);
 698	}
 699
 700	spin_unlock_irqrestore(&xhci->lock, *flags);
 701	temp = usb_acpi_power_manageable(hcd->self.root_hub,
 702					 port->hcd_portnum);
 703	if (temp)
 704		usb_acpi_set_power_state(hcd->self.root_hub,
 705					 port->hcd_portnum, on);
 706	spin_lock_irqsave(&xhci->lock, *flags);
 707}
 708
 709static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
 710	u16 test_mode, u16 wIndex)
 711{
 712	u32 temp;
 713	struct xhci_port *port;
 714
 715	/* xhci only supports test mode for usb2 ports */
 716	port = xhci->usb2_rhub.ports[wIndex];
 717	temp = readl(port->addr + PORTPMSC);
 718	temp |= test_mode << PORT_TEST_MODE_SHIFT;
 719	writel(temp, port->addr + PORTPMSC);
 720	xhci->test_mode = test_mode;
 721	if (test_mode == USB_TEST_FORCE_ENABLE)
 722		xhci_start(xhci);
 723}
 724
 725static int xhci_enter_test_mode(struct xhci_hcd *xhci,
 726				u16 test_mode, u16 wIndex, unsigned long *flags)
 727	__must_hold(&xhci->lock)
 728{
 729	int i, retval;
 730
 731	/* Disable all Device Slots */
 732	xhci_dbg(xhci, "Disable all slots\n");
 733	spin_unlock_irqrestore(&xhci->lock, *flags);
 734	for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 735		if (!xhci->devs[i])
 736			continue;
 737
 738		retval = xhci_disable_slot(xhci, i);
 739		xhci_free_virt_device(xhci, i);
 740		if (retval)
 741			xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 742				 i, retval);
 743	}
 744	spin_lock_irqsave(&xhci->lock, *flags);
 745	/* Put all ports to the Disable state by clear PP */
 746	xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 747	/* Power off USB3 ports*/
 748	for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
 749		xhci_set_port_power(xhci, xhci->usb3_rhub.ports[i], false, flags);
 750	/* Power off USB2 ports*/
 751	for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
 752		xhci_set_port_power(xhci, xhci->usb2_rhub.ports[i], false, flags);
 753	/* Stop the controller */
 754	xhci_dbg(xhci, "Stop controller\n");
 755	retval = xhci_halt(xhci);
 756	if (retval)
 757		return retval;
 758	/* Disable runtime PM for test mode */
 759	pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller);
 760	/* Set PORTPMSC.PTC field to enter selected test mode */
 761	/* Port is selected by wIndex. port_id = wIndex + 1 */
 762	xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n",
 763					test_mode, wIndex + 1);
 764	xhci_port_set_test_mode(xhci, test_mode, wIndex);
 765	return retval;
 766}
 767
 768static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 769{
 770	int retval;
 771
 772	if (!xhci->test_mode) {
 773		xhci_err(xhci, "Not in test mode, do nothing.\n");
 774		return 0;
 775	}
 776	if (xhci->test_mode == USB_TEST_FORCE_ENABLE &&
 777		!(xhci->xhc_state & XHCI_STATE_HALTED)) {
 778		retval = xhci_halt(xhci);
 779		if (retval)
 780			return retval;
 781	}
 782	pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 783	xhci->test_mode = 0;
 784	return xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 785}
 786
 787void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
 788			 u32 link_state)
 789{
 790	u32 temp;
 791	u32 portsc;
 792
 793	portsc = readl(port->addr);
 794	temp = xhci_port_state_to_neutral(portsc);
 795	temp &= ~PORT_PLS_MASK;
 796	temp |= PORT_LINK_STROBE | link_state;
 797	writel(temp, port->addr);
 798
 799	xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x",
 800		 port->rhub->hcd->self.busnum, port->hcd_portnum + 1,
 801		 portsc, temp);
 802}
 803
 804static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 805				      struct xhci_port *port, u16 wake_mask)
 806{
 807	u32 temp;
 808
 809	temp = readl(port->addr);
 810	temp = xhci_port_state_to_neutral(temp);
 811
 812	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 813		temp |= PORT_WKCONN_E;
 814	else
 815		temp &= ~PORT_WKCONN_E;
 816
 817	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 818		temp |= PORT_WKDISC_E;
 819	else
 820		temp &= ~PORT_WKDISC_E;
 821
 822	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 823		temp |= PORT_WKOC_E;
 824	else
 825		temp &= ~PORT_WKOC_E;
 826
 827	writel(temp, port->addr);
 828}
 829
 830/* Test and clear port RWC bit */
 831void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 832			     u32 port_bit)
 833{
 834	u32 temp;
 835
 836	temp = readl(port->addr);
 837	if (temp & port_bit) {
 838		temp = xhci_port_state_to_neutral(temp);
 839		temp |= port_bit;
 840		writel(temp, port->addr);
 841	}
 842}
 843
 844/* Updates Link Status for super Speed port */
 845static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 846		u32 *status, u32 status_reg)
 847{
 848	u32 pls = status_reg & PORT_PLS_MASK;
 849
 850	/* When the CAS bit is set then warm reset
 851	 * should be performed on port
 852	 */
 853	if (status_reg & PORT_CAS) {
 854		/* The CAS bit can be set while the port is
 855		 * in any link state.
 856		 * Only roothubs have CAS bit, so we
 857		 * pretend to be in compliance mode
 858		 * unless we're already in compliance
 859		 * or the inactive state.
 860		 */
 861		if (pls != USB_SS_PORT_LS_COMP_MOD &&
 862		    pls != USB_SS_PORT_LS_SS_INACTIVE) {
 863			pls = USB_SS_PORT_LS_COMP_MOD;
 864		}
 865		/* Return also connection bit -
 866		 * hub state machine resets port
 867		 * when this bit is set.
 868		 */
 869		pls |= USB_PORT_STAT_CONNECTION;
 870	} else {
 871		/*
 872		 * Resume state is an xHCI internal state.  Do not report it to
 873		 * usb core, instead, pretend to be U3, thus usb core knows
 874		 * it's not ready for transfer.
 875		 */
 876		if (pls == XDEV_RESUME) {
 877			*status |= USB_SS_PORT_LS_U3;
 878			return;
 879		}
 880
 881		/*
 882		 * If CAS bit isn't set but the Port is already at
 883		 * Compliance Mode, fake a connection so the USB core
 884		 * notices the Compliance state and resets the port.
 885		 * This resolves an issue generated by the SN65LVPE502CP
 886		 * in which sometimes the port enters compliance mode
 887		 * caused by a delay on the host-device negotiation.
 888		 */
 889		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 890				(pls == USB_SS_PORT_LS_COMP_MOD))
 891			pls |= USB_PORT_STAT_CONNECTION;
 892	}
 893
 894	/* update status field */
 895	*status |= pls;
 896}
 897
 898/*
 899 * Function for Compliance Mode Quirk.
 900 *
 901 * This Function verifies if all xhc USB3 ports have entered U0, if so,
 902 * the compliance mode timer is deleted. A port won't enter
 903 * compliance mode if it has previously entered U0.
 904 */
 905static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 906				    u16 wIndex)
 907{
 908	u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1);
 909	bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 910
 911	if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 912		return;
 913
 914	if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 915		xhci->port_status_u0 |= 1 << wIndex;
 916		if (xhci->port_status_u0 == all_ports_seen_u0) {
 917			del_timer_sync(&xhci->comp_mode_recovery_timer);
 918			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 919				"All USB3 ports have entered U0 already!");
 920			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 921				"Compliance Mode Recovery Timer Deleted.");
 922		}
 923	}
 924}
 925
 926static int xhci_handle_usb2_port_link_resume(struct xhci_port *port,
 927					     u32 portsc,
 928					     unsigned long *flags)
 929{
 930	struct xhci_bus_state *bus_state;
 931	struct xhci_hcd	*xhci;
 932	struct usb_hcd *hcd;
 933	int slot_id;
 934	u32 wIndex;
 935
 936	hcd = port->rhub->hcd;
 937	bus_state = &port->rhub->bus_state;
 938	xhci = hcd_to_xhci(hcd);
 939	wIndex = port->hcd_portnum;
 940
 941	if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) {
 942		return -EINVAL;
 943	}
 944	/* did port event handler already start resume timing? */
 945	if (!port->resume_timestamp) {
 946		/* If not, maybe we are in a host initated resume? */
 947		if (test_bit(wIndex, &bus_state->resuming_ports)) {
 948			/* Host initated resume doesn't time the resume
 949			 * signalling using resume_done[].
 950			 * It manually sets RESUME state, sleeps 20ms
 951			 * and sets U0 state. This should probably be
 952			 * changed, but not right now.
 953			 */
 954		} else {
 955			/* port resume was discovered now and here,
 956			 * start resume timing
 957			 */
 958			unsigned long timeout = jiffies +
 959				msecs_to_jiffies(USB_RESUME_TIMEOUT);
 960
 961			set_bit(wIndex, &bus_state->resuming_ports);
 962			port->resume_timestamp = timeout;
 963			mod_timer(&hcd->rh_timer, timeout);
 964			usb_hcd_start_port_resume(&hcd->self, wIndex);
 965		}
 966	/* Has resume been signalled for USB_RESUME_TIME yet? */
 967	} else if (time_after_eq(jiffies, port->resume_timestamp)) {
 968		int time_left;
 969
 970		xhci_dbg(xhci, "resume USB2 port %d-%d\n",
 971			 hcd->self.busnum, wIndex + 1);
 972
 973		port->resume_timestamp = 0;
 974		clear_bit(wIndex, &bus_state->resuming_ports);
 975
 976		reinit_completion(&port->rexit_done);
 977		port->rexit_active = true;
 978
 979		xhci_test_and_clear_bit(xhci, port, PORT_PLC);
 980		xhci_set_link_state(xhci, port, XDEV_U0);
 981
 982		spin_unlock_irqrestore(&xhci->lock, *flags);
 983		time_left = wait_for_completion_timeout(
 984			&port->rexit_done,
 985			msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS));
 986		spin_lock_irqsave(&xhci->lock, *flags);
 987
 988		if (time_left) {
 989			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 990							    wIndex + 1);
 991			if (!slot_id) {
 992				xhci_dbg(xhci, "slot_id is zero\n");
 993				return -ENODEV;
 994			}
 995			xhci_ring_device(xhci, slot_id);
 996		} else {
 997			int port_status = readl(port->addr);
 998
 999			xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n",
1000				  hcd->self.busnum, wIndex + 1, port_status);
1001			/*
1002			 * keep rexit_active set if U0 transition failed so we
1003			 * know to report PORT_STAT_SUSPEND status back to
1004			 * usbcore. It will be cleared later once the port is
1005			 * out of RESUME/U3 state
1006			 */
1007		}
1008
1009		usb_hcd_end_port_resume(&hcd->self, wIndex);
1010		bus_state->port_c_suspend |= 1 << wIndex;
1011		bus_state->suspended_ports &= ~(1 << wIndex);
1012	}
1013
1014	return 0;
1015}
1016
1017static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
1018{
1019	u32 ext_stat = 0;
1020	int speed_id;
1021
1022	/* only support rx and tx lane counts of 1 in usb3.1 spec */
1023	speed_id = DEV_PORT_SPEED(raw_port_status);
1024	ext_stat |= speed_id;		/* bits 3:0, RX speed id */
1025	ext_stat |= speed_id << 4;	/* bits 7:4, TX speed id */
1026
1027	ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
1028	ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
1029
1030	return ext_stat;
1031}
1032
1033static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
1034				      u32 portsc)
1035{
1036	struct xhci_bus_state *bus_state;
1037	struct xhci_hcd	*xhci;
1038	struct usb_hcd *hcd;
1039	u32 link_state;
1040	u32 portnum;
1041
1042	bus_state = &port->rhub->bus_state;
1043	xhci = hcd_to_xhci(port->rhub->hcd);
1044	hcd = port->rhub->hcd;
1045	link_state = portsc & PORT_PLS_MASK;
1046	portnum = port->hcd_portnum;
1047
1048	/* USB3 specific wPortChange bits
1049	 *
1050	 * Port link change with port in resume state should not be
1051	 * reported to usbcore, as this is an internal state to be
1052	 * handled by xhci driver. Reporting PLC to usbcore may
1053	 * cause usbcore clearing PLC first and port change event
1054	 * irq won't be generated.
1055	 */
1056
1057	if (portsc & PORT_PLC && (link_state != XDEV_RESUME))
1058		*status |= USB_PORT_STAT_C_LINK_STATE << 16;
1059	if (portsc & PORT_WRC)
1060		*status |= USB_PORT_STAT_C_BH_RESET << 16;
1061	if (portsc & PORT_CEC)
1062		*status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
1063
1064	/* USB3 specific wPortStatus bits */
1065	if (portsc & PORT_POWER)
1066		*status |= USB_SS_PORT_STAT_POWER;
1067
1068	/* no longer suspended or resuming */
1069	if (link_state != XDEV_U3 &&
1070	    link_state != XDEV_RESUME &&
1071	    link_state != XDEV_RECOVERY) {
1072		/* remote wake resume signaling complete */
1073		if (bus_state->port_remote_wakeup & (1 << portnum)) {
1074			bus_state->port_remote_wakeup &= ~(1 << portnum);
1075			usb_hcd_end_port_resume(&hcd->self, portnum);
1076		}
1077		bus_state->suspended_ports &= ~(1 << portnum);
1078	}
1079
1080	xhci_hub_report_usb3_link_state(xhci, status, portsc);
1081	xhci_del_comp_mod_timer(xhci, portsc, portnum);
1082}
1083
1084static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
1085				      u32 portsc, unsigned long *flags)
1086{
1087	struct xhci_bus_state *bus_state;
1088	u32 link_state;
1089	u32 portnum;
1090	int err;
1091
1092	bus_state = &port->rhub->bus_state;
1093	link_state = portsc & PORT_PLS_MASK;
1094	portnum = port->hcd_portnum;
1095
1096	/* USB2 wPortStatus bits */
1097	if (portsc & PORT_POWER) {
1098		*status |= USB_PORT_STAT_POWER;
1099
1100		/* link state is only valid if port is powered */
1101		if (link_state == XDEV_U3)
1102			*status |= USB_PORT_STAT_SUSPEND;
1103		if (link_state == XDEV_U2)
1104			*status |= USB_PORT_STAT_L1;
1105		if (link_state == XDEV_U0) {
1106			if (bus_state->suspended_ports & (1 << portnum)) {
1107				bus_state->suspended_ports &= ~(1 << portnum);
1108				bus_state->port_c_suspend |= 1 << portnum;
1109			}
1110		}
1111		if (link_state == XDEV_RESUME) {
1112			err = xhci_handle_usb2_port_link_resume(port, portsc,
1113								flags);
1114			if (err < 0)
1115				*status = 0xffffffff;
1116			else if (port->resume_timestamp || port->rexit_active)
1117				*status |= USB_PORT_STAT_SUSPEND;
1118		}
1119	}
1120
1121	/*
1122	 * Clear usb2 resume signalling variables if port is no longer suspended
1123	 * or resuming. Port either resumed to U0/U1/U2, disconnected, or in a
1124	 * error state. Resume related variables should be cleared in all those cases.
1125	 */
1126	if (link_state != XDEV_U3 && link_state != XDEV_RESUME) {
1127		if (port->resume_timestamp ||
1128		    test_bit(portnum, &bus_state->resuming_ports)) {
1129			port->resume_timestamp = 0;
1130			clear_bit(portnum, &bus_state->resuming_ports);
1131			usb_hcd_end_port_resume(&port->rhub->hcd->self, portnum);
1132		}
1133		port->rexit_active = 0;
1134		bus_state->suspended_ports &= ~(1 << portnum);
1135	}
1136}
1137
1138/*
1139 * Converts a raw xHCI port status into the format that external USB 2.0 or USB
1140 * 3.0 hubs use.
1141 *
1142 * Possible side effects:
1143 *  - Mark a port as being done with device resume,
1144 *    and ring the endpoint doorbells.
1145 *  - Stop the Synopsys redriver Compliance Mode polling.
1146 *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
1147 */
1148static u32 xhci_get_port_status(struct usb_hcd *hcd,
1149		struct xhci_bus_state *bus_state,
1150	u16 wIndex, u32 raw_port_status,
1151		unsigned long *flags)
1152	__releases(&xhci->lock)
1153	__acquires(&xhci->lock)
1154{
1155	u32 status = 0;
1156	struct xhci_hub *rhub;
1157	struct xhci_port *port;
1158
1159	rhub = xhci_get_rhub(hcd);
1160	port = rhub->ports[wIndex];
1161
1162	/* common wPortChange bits */
1163	if (raw_port_status & PORT_CSC)
1164		status |= USB_PORT_STAT_C_CONNECTION << 16;
1165	if (raw_port_status & PORT_PEC)
1166		status |= USB_PORT_STAT_C_ENABLE << 16;
1167	if ((raw_port_status & PORT_OCC))
1168		status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1169	if ((raw_port_status & PORT_RC))
1170		status |= USB_PORT_STAT_C_RESET << 16;
1171
1172	/* common wPortStatus bits */
1173	if (raw_port_status & PORT_CONNECT) {
1174		status |= USB_PORT_STAT_CONNECTION;
1175		status |= xhci_port_speed(raw_port_status);
1176	}
1177	if (raw_port_status & PORT_PE)
1178		status |= USB_PORT_STAT_ENABLE;
1179	if (raw_port_status & PORT_OC)
1180		status |= USB_PORT_STAT_OVERCURRENT;
1181	if (raw_port_status & PORT_RESET)
1182		status |= USB_PORT_STAT_RESET;
1183
1184	/* USB2 and USB3 specific bits, including Port Link State */
1185	if (hcd->speed >= HCD_USB3)
1186		xhci_get_usb3_port_status(port, &status, raw_port_status);
1187	else
1188		xhci_get_usb2_port_status(port, &status, raw_port_status,
1189					  flags);
1190
1191	if (bus_state->port_c_suspend & (1 << wIndex))
1192		status |= USB_PORT_STAT_C_SUSPEND << 16;
1193
1194	return status;
1195}
1196
1197int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
1198		u16 wIndex, char *buf, u16 wLength)
1199{
1200	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1201	int max_ports;
1202	unsigned long flags;
1203	u32 temp, status;
1204	int retval = 0;
1205	int slot_id;
1206	struct xhci_bus_state *bus_state;
1207	u16 link_state = 0;
1208	u16 wake_mask = 0;
1209	u16 timeout = 0;
1210	u16 test_mode = 0;
1211	struct xhci_hub *rhub;
1212	struct xhci_port **ports;
1213	struct xhci_port *port;
1214	int portnum1;
1215
1216	rhub = xhci_get_rhub(hcd);
1217	ports = rhub->ports;
1218	max_ports = rhub->num_ports;
1219	bus_state = &rhub->bus_state;
1220	portnum1 = wIndex & 0xff;
1221
1222	spin_lock_irqsave(&xhci->lock, flags);
1223	switch (typeReq) {
1224	case GetHubStatus:
1225		/* No power source, over-current reported per port */
1226		memset(buf, 0, 4);
1227		break;
1228	case GetHubDescriptor:
1229		/* Check to make sure userspace is asking for the USB 3.0 hub
1230		 * descriptor for the USB 3.0 roothub.  If not, we stall the
1231		 * endpoint, like external hubs do.
1232		 */
1233		if (hcd->speed >= HCD_USB3 &&
1234				(wLength < USB_DT_SS_HUB_SIZE ||
1235				 wValue != (USB_DT_SS_HUB << 8))) {
1236			xhci_dbg(xhci, "Wrong hub descriptor type for "
1237					"USB 3.0 roothub.\n");
1238			goto error;
1239		}
1240		xhci_hub_descriptor(hcd, xhci,
1241				(struct usb_hub_descriptor *) buf);
1242		break;
1243	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1244		if ((wValue & 0xff00) != (USB_DT_BOS << 8))
1245			goto error;
1246
1247		if (hcd->speed < HCD_USB3)
1248			goto error;
1249
1250		retval = xhci_create_usb3x_bos_desc(xhci, buf, wLength);
1251		spin_unlock_irqrestore(&xhci->lock, flags);
1252		return retval;
1253	case GetPortStatus:
1254		if (!portnum1 || portnum1 > max_ports)
1255			goto error;
1256
1257		wIndex--;
1258		port = ports[portnum1 - 1];
1259		temp = readl(port->addr);
1260		if (temp == ~(u32)0) {
1261			xhci_hc_died(xhci);
1262			retval = -ENODEV;
1263			break;
1264		}
1265		trace_xhci_get_port_status(port, temp);
1266		status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
1267					      &flags);
1268		if (status == 0xffffffff)
1269			goto error;
1270
1271		xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x",
1272			 hcd->self.busnum, portnum1, temp, status);
1273
1274		put_unaligned(cpu_to_le32(status), (__le32 *) buf);
1275		/* if USB 3.1 extended port status return additional 4 bytes */
1276		if (wValue == 0x02) {
1277			u32 port_li;
1278
1279			if (hcd->speed < HCD_USB31 || wLength != 8) {
1280				xhci_err(xhci, "get ext port status invalid parameter\n");
1281				retval = -EINVAL;
1282				break;
1283			}
1284			port_li = readl(port->addr + PORTLI);
1285			status = xhci_get_ext_port_status(temp, port_li);
1286			put_unaligned_le32(status, &buf[4]);
1287		}
1288		break;
1289	case SetPortFeature:
1290		if (wValue == USB_PORT_FEAT_LINK_STATE)
1291			link_state = (wIndex & 0xff00) >> 3;
1292		if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
1293			wake_mask = wIndex & 0xff00;
1294		if (wValue == USB_PORT_FEAT_TEST)
1295			test_mode = (wIndex & 0xff00) >> 8;
1296		/* The MSB of wIndex is the U1/U2 timeout */
1297		timeout = (wIndex & 0xff00) >> 8;
1298
1299		wIndex &= 0xff;
1300		if (!portnum1 || portnum1 > max_ports)
1301			goto error;
1302
1303		port = ports[portnum1 - 1];
1304		wIndex--;
1305		temp = readl(port->addr);
1306		if (temp == ~(u32)0) {
1307			xhci_hc_died(xhci);
1308			retval = -ENODEV;
1309			break;
1310		}
1311		temp = xhci_port_state_to_neutral(temp);
1312		/* FIXME: What new port features do we need to support? */
1313		switch (wValue) {
1314		case USB_PORT_FEAT_SUSPEND:
1315			temp = readl(port->addr);
1316			if ((temp & PORT_PLS_MASK) != XDEV_U0) {
1317				/* Resume the port to U0 first */
1318				xhci_set_link_state(xhci, port, XDEV_U0);
1319				spin_unlock_irqrestore(&xhci->lock, flags);
1320				msleep(10);
1321				spin_lock_irqsave(&xhci->lock, flags);
1322			}
1323			/* In spec software should not attempt to suspend
1324			 * a port unless the port reports that it is in the
1325			 * enabled (PED = ‘1’,PLS < ‘3’) state.
1326			 */
1327			temp = readl(port->addr);
1328			if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1329				|| (temp & PORT_PLS_MASK) >= XDEV_U3) {
1330				xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n",
1331					  hcd->self.busnum, portnum1);
1332				goto error;
1333			}
1334
1335			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1336							    portnum1);
1337			if (!slot_id) {
1338				xhci_warn(xhci, "slot_id is zero\n");
1339				goto error;
1340			}
1341			/* unlock to execute stop endpoint commands */
1342			spin_unlock_irqrestore(&xhci->lock, flags);
1343			xhci_stop_device(xhci, slot_id, 1);
1344			spin_lock_irqsave(&xhci->lock, flags);
1345
1346			xhci_set_link_state(xhci, port, XDEV_U3);
1347
1348			spin_unlock_irqrestore(&xhci->lock, flags);
1349			msleep(10); /* wait device to enter */
1350			spin_lock_irqsave(&xhci->lock, flags);
1351
1352			temp = readl(port->addr);
1353			bus_state->suspended_ports |= 1 << wIndex;
1354			break;
1355		case USB_PORT_FEAT_LINK_STATE:
1356			temp = readl(port->addr);
1357			/* Disable port */
1358			if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1359				xhci_dbg(xhci, "Disable port %d-%d\n",
1360					 hcd->self.busnum, portnum1);
1361				temp = xhci_port_state_to_neutral(temp);
1362				/*
1363				 * Clear all change bits, so that we get a new
1364				 * connection event.
1365				 */
1366				temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1367					PORT_OCC | PORT_RC | PORT_PLC |
1368					PORT_CEC;
1369				writel(temp | PORT_PE, port->addr);
1370				temp = readl(port->addr);
1371				break;
1372			}
1373
1374			/* Put link in RxDetect (enable port) */
1375			if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1376				xhci_dbg(xhci, "Enable port %d-%d\n",
1377					 hcd->self.busnum, portnum1);
1378				xhci_set_link_state(xhci, port,	link_state);
1379				temp = readl(port->addr);
1380				break;
1381			}
1382
1383			/*
1384			 * For xHCI 1.1 according to section 4.19.1.2.4.1 a
1385			 * root hub port's transition to compliance mode upon
1386			 * detecting LFPS timeout may be controlled by an
1387			 * Compliance Transition Enabled (CTE) flag (not
1388			 * software visible). This flag is set by writing 0xA
1389			 * to PORTSC PLS field which will allow transition to
1390			 * compliance mode the next time LFPS timeout is
1391			 * encountered. A warm reset will clear it.
1392			 *
1393			 * The CTE flag is only supported if the HCCPARAMS2 CTC
1394			 * flag is set, otherwise, the compliance substate is
1395			 * automatically entered as on 1.0 and prior.
1396			 */
1397			if (link_state == USB_SS_PORT_LS_COMP_MOD) {
1398				if (!HCC2_CTC(xhci->hcc_params2)) {
1399					xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
1400					break;
1401				}
1402
1403				if ((temp & PORT_CONNECT)) {
1404					xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
1405					goto error;
1406				}
1407
1408				xhci_dbg(xhci, "Enable compliance mode transition for port %d-%d\n",
1409					 hcd->self.busnum, portnum1);
1410				xhci_set_link_state(xhci, port, link_state);
1411
1412				temp = readl(port->addr);
1413				break;
1414			}
1415			/* Port must be enabled */
1416			if (!(temp & PORT_PE)) {
1417				retval = -ENODEV;
1418				break;
1419			}
1420			/* Can't set port link state above '3' (U3) */
1421			if (link_state > USB_SS_PORT_LS_U3) {
1422				xhci_warn(xhci, "Cannot set port %d-%d link state %d\n",
1423					  hcd->self.busnum, portnum1, link_state);
1424				goto error;
1425			}
1426
1427			/*
1428			 * set link to U0, steps depend on current link state.
1429			 * U3: set link to U0 and wait for u3exit completion.
1430			 * U1/U2:  no PLC complete event, only set link to U0.
1431			 * Resume/Recovery: device initiated U0, only wait for
1432			 * completion
1433			 */
1434			if (link_state == USB_SS_PORT_LS_U0) {
1435				u32 pls = temp & PORT_PLS_MASK;
1436				bool wait_u0 = false;
1437
1438				/* already in U0 */
1439				if (pls == XDEV_U0)
1440					break;
1441				if (pls == XDEV_U3 ||
1442				    pls == XDEV_RESUME ||
1443				    pls == XDEV_RECOVERY) {
1444					wait_u0 = true;
1445					reinit_completion(&port->u3exit_done);
1446				}
1447				if (pls <= XDEV_U3) /* U1, U2, U3 */
1448					xhci_set_link_state(xhci, port, USB_SS_PORT_LS_U0);
1449				if (!wait_u0) {
1450					if (pls > XDEV_U3)
1451						goto error;
1452					break;
1453				}
1454				spin_unlock_irqrestore(&xhci->lock, flags);
1455				if (!wait_for_completion_timeout(&port->u3exit_done,
1456								 msecs_to_jiffies(500)))
1457					xhci_dbg(xhci, "missing U0 port change event for port %d-%d\n",
1458						 hcd->self.busnum, portnum1);
1459				spin_lock_irqsave(&xhci->lock, flags);
1460				temp = readl(port->addr);
1461				break;
1462			}
1463
1464			if (link_state == USB_SS_PORT_LS_U3) {
1465				int retries = 16;
1466				slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1467								    portnum1);
1468				if (slot_id) {
1469					/* unlock to execute stop endpoint
1470					 * commands */
1471					spin_unlock_irqrestore(&xhci->lock,
1472								flags);
1473					xhci_stop_device(xhci, slot_id, 1);
1474					spin_lock_irqsave(&xhci->lock, flags);
1475				}
1476				xhci_set_link_state(xhci, port, USB_SS_PORT_LS_U3);
1477				spin_unlock_irqrestore(&xhci->lock, flags);
1478				while (retries--) {
1479					usleep_range(4000, 8000);
1480					temp = readl(port->addr);
1481					if ((temp & PORT_PLS_MASK) == XDEV_U3)
1482						break;
1483				}
1484				spin_lock_irqsave(&xhci->lock, flags);
1485				temp = readl(port->addr);
1486				bus_state->suspended_ports |= 1 << wIndex;
1487			}
1488			break;
1489		case USB_PORT_FEAT_POWER:
1490			/*
1491			 * Turn on ports, even if there isn't per-port switching.
1492			 * HC will report connect events even before this is set.
1493			 * However, hub_wq will ignore the roothub events until
1494			 * the roothub is registered.
1495			 */
1496			xhci_set_port_power(xhci, port, true, &flags);
1497			break;
1498		case USB_PORT_FEAT_RESET:
1499			temp = (temp | PORT_RESET);
1500			writel(temp, port->addr);
1501
1502			temp = readl(port->addr);
1503			xhci_dbg(xhci, "set port reset, actual port %d-%d status  = 0x%x\n",
1504				 hcd->self.busnum, portnum1, temp);
1505			break;
1506		case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1507			xhci_set_remote_wake_mask(xhci, port, wake_mask);
1508			temp = readl(port->addr);
1509			xhci_dbg(xhci, "set port remote wake mask, actual port %d-%d status  = 0x%x\n",
1510				 hcd->self.busnum, portnum1, temp);
1511			break;
1512		case USB_PORT_FEAT_BH_PORT_RESET:
1513			temp |= PORT_WR;
1514			writel(temp, port->addr);
1515			temp = readl(port->addr);
1516			break;
1517		case USB_PORT_FEAT_U1_TIMEOUT:
1518			if (hcd->speed < HCD_USB3)
1519				goto error;
1520			temp = readl(port->addr + PORTPMSC);
1521			temp &= ~PORT_U1_TIMEOUT_MASK;
1522			temp |= PORT_U1_TIMEOUT(timeout);
1523			writel(temp, port->addr + PORTPMSC);
1524			break;
1525		case USB_PORT_FEAT_U2_TIMEOUT:
1526			if (hcd->speed < HCD_USB3)
1527				goto error;
1528			temp = readl(port->addr + PORTPMSC);
1529			temp &= ~PORT_U2_TIMEOUT_MASK;
1530			temp |= PORT_U2_TIMEOUT(timeout);
1531			writel(temp, port->addr + PORTPMSC);
1532			break;
1533		case USB_PORT_FEAT_TEST:
1534			/* 4.19.6 Port Test Modes (USB2 Test Mode) */
1535			if (hcd->speed != HCD_USB2)
1536				goto error;
1537			if (test_mode > USB_TEST_FORCE_ENABLE ||
1538			    test_mode < USB_TEST_J)
1539				goto error;
1540			retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
1541						      &flags);
1542			break;
1543		default:
1544			goto error;
1545		}
1546		/* unblock any posted writes */
1547		temp = readl(port->addr);
1548		break;
1549	case ClearPortFeature:
1550		if (!portnum1 || portnum1 > max_ports)
1551			goto error;
1552
1553		port = ports[portnum1 - 1];
1554
1555		wIndex--;
1556		temp = readl(port->addr);
1557		if (temp == ~(u32)0) {
1558			xhci_hc_died(xhci);
1559			retval = -ENODEV;
1560			break;
1561		}
1562		/* FIXME: What new port features do we need to support? */
1563		temp = xhci_port_state_to_neutral(temp);
1564		switch (wValue) {
1565		case USB_PORT_FEAT_SUSPEND:
1566			temp = readl(port->addr);
1567			xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1568			xhci_dbg(xhci, "PORTSC %04x\n", temp);
1569			if (temp & PORT_RESET)
1570				goto error;
1571			if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1572				if ((temp & PORT_PE) == 0)
1573					goto error;
1574
1575				set_bit(wIndex, &bus_state->resuming_ports);
1576				usb_hcd_start_port_resume(&hcd->self, wIndex);
1577				xhci_set_link_state(xhci, port, XDEV_RESUME);
1578				spin_unlock_irqrestore(&xhci->lock, flags);
1579				msleep(USB_RESUME_TIMEOUT);
1580				spin_lock_irqsave(&xhci->lock, flags);
1581				xhci_set_link_state(xhci, port, XDEV_U0);
1582				clear_bit(wIndex, &bus_state->resuming_ports);
1583				usb_hcd_end_port_resume(&hcd->self, wIndex);
1584			}
1585			bus_state->port_c_suspend |= 1 << wIndex;
1586
1587			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1588					portnum1);
1589			if (!slot_id) {
1590				xhci_dbg(xhci, "slot_id is zero\n");
1591				goto error;
1592			}
1593			xhci_ring_device(xhci, slot_id);
1594			break;
1595		case USB_PORT_FEAT_C_SUSPEND:
1596			bus_state->port_c_suspend &= ~(1 << wIndex);
1597			fallthrough;
1598		case USB_PORT_FEAT_C_RESET:
1599		case USB_PORT_FEAT_C_BH_PORT_RESET:
1600		case USB_PORT_FEAT_C_CONNECTION:
1601		case USB_PORT_FEAT_C_OVER_CURRENT:
1602		case USB_PORT_FEAT_C_ENABLE:
1603		case USB_PORT_FEAT_C_PORT_LINK_STATE:
1604		case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1605			xhci_clear_port_change_bit(xhci, wValue, wIndex,
1606					port->addr, temp);
1607			break;
1608		case USB_PORT_FEAT_ENABLE:
1609			xhci_disable_port(xhci, port);
1610			break;
1611		case USB_PORT_FEAT_POWER:
1612			xhci_set_port_power(xhci, port, false, &flags);
1613			break;
1614		case USB_PORT_FEAT_TEST:
1615			retval = xhci_exit_test_mode(xhci);
1616			break;
1617		default:
1618			goto error;
1619		}
1620		break;
1621	default:
1622error:
1623		/* "stall" on error */
1624		retval = -EPIPE;
1625	}
1626	spin_unlock_irqrestore(&xhci->lock, flags);
1627	return retval;
1628}
1629EXPORT_SYMBOL_GPL(xhci_hub_control);
1630
1631/*
1632 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1633 * Ports are 0-indexed from the HCD point of view,
1634 * and 1-indexed from the USB core pointer of view.
1635 *
1636 * Note that the status change bits will be cleared as soon as a port status
1637 * change event is generated, so we use the saved status from that event.
1638 */
1639int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1640{
1641	unsigned long flags;
1642	u32 temp, status;
1643	u32 mask;
1644	int i, retval;
1645	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1646	int max_ports;
1647	struct xhci_bus_state *bus_state;
1648	bool reset_change = false;
1649	struct xhci_hub *rhub;
1650	struct xhci_port **ports;
1651
1652	rhub = xhci_get_rhub(hcd);
1653	ports = rhub->ports;
1654	max_ports = rhub->num_ports;
1655	bus_state = &rhub->bus_state;
1656
1657	/* Initial status is no changes */
1658	retval = (max_ports + 8) / 8;
1659	memset(buf, 0, retval);
1660
1661	/*
1662	 * Inform the usbcore about resume-in-progress by returning
1663	 * a non-zero value even if there are no status changes.
1664	 */
1665	spin_lock_irqsave(&xhci->lock, flags);
1666
1667	status = bus_state->resuming_ports;
1668
1669	/*
1670	 * SS devices are only visible to roothub after link training completes.
1671	 * Keep polling roothubs for a grace period after xHC start
1672	 */
1673	if (xhci->run_graceperiod) {
1674		if (time_before(jiffies, xhci->run_graceperiod))
1675			status = 1;
1676		else
1677			xhci->run_graceperiod = 0;
1678	}
1679
1680	mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1681
1682	/* For each port, did anything change?  If so, set that bit in buf. */
1683	for (i = 0; i < max_ports; i++) {
1684		temp = readl(ports[i]->addr);
1685		if (temp == ~(u32)0) {
1686			xhci_hc_died(xhci);
1687			retval = -ENODEV;
1688			break;
1689		}
1690		trace_xhci_hub_status_data(ports[i], temp);
1691
1692		if ((temp & mask) != 0 ||
1693			(bus_state->port_c_suspend & 1 << i) ||
1694			(ports[i]->resume_timestamp && time_after_eq(
1695			    jiffies, ports[i]->resume_timestamp))) {
1696			buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1697			status = 1;
1698		}
1699		if ((temp & PORT_RC))
1700			reset_change = true;
1701		if (temp & PORT_OC)
1702			status = 1;
1703	}
1704	if (!status && !reset_change) {
1705		xhci_dbg(xhci, "%s: stopping usb%d port polling\n",
1706			 __func__, hcd->self.busnum);
1707		clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1708	}
1709	spin_unlock_irqrestore(&xhci->lock, flags);
1710	return status ? retval : 0;
1711}
1712
1713#ifdef CONFIG_PM
1714
1715int xhci_bus_suspend(struct usb_hcd *hcd)
1716{
1717	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1718	int max_ports, port_index;
1719	struct xhci_bus_state *bus_state;
1720	unsigned long flags;
1721	struct xhci_hub *rhub;
1722	struct xhci_port **ports;
1723	u32 portsc_buf[USB_MAXCHILDREN];
1724	bool wake_enabled;
1725
1726	rhub = xhci_get_rhub(hcd);
1727	ports = rhub->ports;
1728	max_ports = rhub->num_ports;
1729	bus_state = &rhub->bus_state;
1730	wake_enabled = hcd->self.root_hub->do_remote_wakeup;
1731
1732	spin_lock_irqsave(&xhci->lock, flags);
1733
1734	if (wake_enabled) {
1735		if (bus_state->resuming_ports ||	/* USB2 */
1736		    bus_state->port_remote_wakeup) {	/* USB3 */
1737			spin_unlock_irqrestore(&xhci->lock, flags);
1738			xhci_dbg(xhci, "usb%d bus suspend to fail because a port is resuming\n",
1739				 hcd->self.busnum);
1740			return -EBUSY;
1741		}
1742	}
1743	/*
1744	 * Prepare ports for suspend, but don't write anything before all ports
1745	 * are checked and we know bus suspend can proceed
1746	 */
1747	bus_state->bus_suspended = 0;
1748	port_index = max_ports;
1749	while (port_index--) {
1750		u32 t1, t2;
1751		int retries = 10;
1752retry:
1753		t1 = readl(ports[port_index]->addr);
1754		t2 = xhci_port_state_to_neutral(t1);
1755		portsc_buf[port_index] = 0;
1756
1757		/*
1758		 * Give a USB3 port in link training time to finish, but don't
1759		 * prevent suspend as port might be stuck
1760		 */
1761		if ((hcd->speed >= HCD_USB3) && retries-- &&
1762		    (t1 & PORT_PLS_MASK) == XDEV_POLLING) {
1763			spin_unlock_irqrestore(&xhci->lock, flags);
1764			msleep(XHCI_PORT_POLLING_LFPS_TIME);
1765			spin_lock_irqsave(&xhci->lock, flags);
1766			xhci_dbg(xhci, "port %d-%d polling in bus suspend, waiting\n",
1767				 hcd->self.busnum, port_index + 1);
1768			goto retry;
1769		}
1770		/* bail out if port detected a over-current condition */
1771		if (t1 & PORT_OC) {
1772			bus_state->bus_suspended = 0;
1773			spin_unlock_irqrestore(&xhci->lock, flags);
1774			xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n");
1775			return -EBUSY;
1776		}
1777		/* suspend ports in U0, or bail out for new connect changes */
1778		if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
1779			if ((t1 & PORT_CSC) && wake_enabled) {
1780				bus_state->bus_suspended = 0;
1781				spin_unlock_irqrestore(&xhci->lock, flags);
1782				xhci_dbg(xhci, "Bus suspend bailout, port connect change\n");
1783				return -EBUSY;
1784			}
1785			xhci_dbg(xhci, "port %d-%d not suspended\n",
1786				 hcd->self.busnum, port_index + 1);
1787			t2 &= ~PORT_PLS_MASK;
1788			t2 |= PORT_LINK_STROBE | XDEV_U3;
1789			set_bit(port_index, &bus_state->bus_suspended);
1790		}
1791		/* USB core sets remote wake mask for USB 3.0 hubs,
1792		 * including the USB 3.0 roothub, but only if CONFIG_PM
1793		 * is enabled, so also enable remote wake here.
1794		 */
1795		if (wake_enabled) {
1796			if (t1 & PORT_CONNECT) {
1797				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1798				t2 &= ~PORT_WKCONN_E;
1799			} else {
1800				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1801				t2 &= ~PORT_WKDISC_E;
1802			}
1803
1804			if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
1805			    (hcd->speed < HCD_USB3)) {
1806				if (usb_amd_pt_check_port(hcd->self.controller,
1807							  port_index))
1808					t2 &= ~PORT_WAKE_BITS;
1809			}
1810		} else
1811			t2 &= ~PORT_WAKE_BITS;
1812
1813		t1 = xhci_port_state_to_neutral(t1);
1814		if (t1 != t2)
1815			portsc_buf[port_index] = t2;
1816	}
1817
1818	/* write port settings, stopping and suspending ports if needed */
1819	port_index = max_ports;
1820	while (port_index--) {
1821		if (!portsc_buf[port_index])
1822			continue;
1823		if (test_bit(port_index, &bus_state->bus_suspended)) {
1824			int slot_id;
1825
1826			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1827							    port_index + 1);
1828			if (slot_id) {
1829				spin_unlock_irqrestore(&xhci->lock, flags);
1830				xhci_stop_device(xhci, slot_id, 1);
1831				spin_lock_irqsave(&xhci->lock, flags);
1832			}
1833		}
1834		writel(portsc_buf[port_index], ports[port_index]->addr);
1835	}
1836	hcd->state = HC_STATE_SUSPENDED;
1837	bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1838	spin_unlock_irqrestore(&xhci->lock, flags);
1839
1840	if (bus_state->bus_suspended)
1841		usleep_range(5000, 10000);
1842
1843	return 0;
1844}
1845
1846/*
1847 * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1848 * warm reset a USB3 device stuck in polling or compliance mode after resume.
1849 * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1850 */
1851static bool xhci_port_missing_cas_quirk(struct xhci_port *port)
1852{
1853	u32 portsc;
1854
1855	portsc = readl(port->addr);
1856
1857	/* if any of these are set we are not stuck */
1858	if (portsc & (PORT_CONNECT | PORT_CAS))
1859		return false;
1860
1861	if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1862	    ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1863		return false;
1864
1865	/* clear wakeup/change bits, and do a warm port reset */
1866	portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1867	portsc |= PORT_WR;
1868	writel(portsc, port->addr);
1869	/* flush write */
1870	readl(port->addr);
1871	return true;
1872}
1873
1874int xhci_bus_resume(struct usb_hcd *hcd)
1875{
1876	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1877	struct xhci_bus_state *bus_state;
1878	unsigned long flags;
1879	int max_ports, port_index;
1880	int slot_id;
1881	int sret;
1882	u32 next_state;
1883	u32 temp, portsc;
1884	struct xhci_hub *rhub;
1885	struct xhci_port **ports;
1886
1887	rhub = xhci_get_rhub(hcd);
1888	ports = rhub->ports;
1889	max_ports = rhub->num_ports;
1890	bus_state = &rhub->bus_state;
1891
1892	if (time_before(jiffies, bus_state->next_statechange))
1893		msleep(5);
1894
1895	spin_lock_irqsave(&xhci->lock, flags);
1896	if (!HCD_HW_ACCESSIBLE(hcd)) {
1897		spin_unlock_irqrestore(&xhci->lock, flags);
1898		return -ESHUTDOWN;
1899	}
1900
1901	/* delay the irqs */
1902	temp = readl(&xhci->op_regs->command);
1903	temp &= ~CMD_EIE;
1904	writel(temp, &xhci->op_regs->command);
1905
1906	/* bus specific resume for ports we suspended at bus_suspend */
1907	if (hcd->speed >= HCD_USB3)
1908		next_state = XDEV_U0;
1909	else
1910		next_state = XDEV_RESUME;
1911
1912	port_index = max_ports;
1913	while (port_index--) {
1914		portsc = readl(ports[port_index]->addr);
1915
1916		/* warm reset CAS limited ports stuck in polling/compliance */
1917		if ((xhci->quirks & XHCI_MISSING_CAS) &&
1918		    (hcd->speed >= HCD_USB3) &&
1919		    xhci_port_missing_cas_quirk(ports[port_index])) {
1920			xhci_dbg(xhci, "reset stuck port %d-%d\n",
1921				 hcd->self.busnum, port_index + 1);
1922			clear_bit(port_index, &bus_state->bus_suspended);
1923			continue;
1924		}
1925		/* resume if we suspended the link, and it is still suspended */
1926		if (test_bit(port_index, &bus_state->bus_suspended))
1927			switch (portsc & PORT_PLS_MASK) {
1928			case XDEV_U3:
1929				portsc = xhci_port_state_to_neutral(portsc);
1930				portsc &= ~PORT_PLS_MASK;
1931				portsc |= PORT_LINK_STROBE | next_state;
1932				break;
1933			case XDEV_RESUME:
1934				/* resume already initiated */
1935				break;
1936			default:
1937				/* not in a resumeable state, ignore it */
1938				clear_bit(port_index,
1939					  &bus_state->bus_suspended);
1940				break;
1941			}
1942		/* disable wake for all ports, write new link state if needed */
1943		portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1944		writel(portsc, ports[port_index]->addr);
1945	}
1946
1947	/* USB2 specific resume signaling delay and U0 link state transition */
1948	if (hcd->speed < HCD_USB3) {
1949		if (bus_state->bus_suspended) {
1950			spin_unlock_irqrestore(&xhci->lock, flags);
1951			msleep(USB_RESUME_TIMEOUT);
1952			spin_lock_irqsave(&xhci->lock, flags);
1953		}
1954		for_each_set_bit(port_index, &bus_state->bus_suspended,
1955				 BITS_PER_LONG) {
1956			/* Clear PLC to poll it later for U0 transition */
1957			xhci_test_and_clear_bit(xhci, ports[port_index],
1958						PORT_PLC);
1959			xhci_set_link_state(xhci, ports[port_index], XDEV_U0);
1960		}
1961	}
1962
1963	/* poll for U0 link state complete, both USB2 and USB3 */
1964	for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) {
1965		sret = xhci_handshake(ports[port_index]->addr, PORT_PLC,
1966				      PORT_PLC, 10 * 1000);
1967		if (sret) {
1968			xhci_warn(xhci, "port %d-%d resume PLC timeout\n",
1969				  hcd->self.busnum, port_index + 1);
1970			continue;
1971		}
1972		xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC);
1973		slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1974		if (slot_id)
1975			xhci_ring_device(xhci, slot_id);
1976	}
1977	(void) readl(&xhci->op_regs->command);
1978
1979	bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1980	/* re-enable irqs */
1981	temp = readl(&xhci->op_regs->command);
1982	temp |= CMD_EIE;
1983	writel(temp, &xhci->op_regs->command);
1984	temp = readl(&xhci->op_regs->command);
1985
1986	spin_unlock_irqrestore(&xhci->lock, flags);
1987	return 0;
1988}
1989
1990unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
1991{
1992	struct xhci_hub *rhub = xhci_get_rhub(hcd);
1993
1994	/* USB3 port wakeups are reported via usb_wakeup_notification() */
1995	return rhub->bus_state.resuming_ports;	/* USB2 ports only */
1996}
1997
1998#endif	/* CONFIG_PM */