xhci.h 59.7 KB
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/*
 * xHCI host controller driver
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __LINUX_XHCI_HCD_H
#define __LINUX_XHCI_HCD_H

#include <linux/usb.h>
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#include <linux/timer.h>
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#include <linux/kernel.h>
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#include <linux/usb/hcd.h>
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/* Code sharing between pci-quirks and xhci hcd */
#include	"xhci-ext-caps.h"
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#include "pci-quirks.h"
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/* xHCI PCI Configuration Registers */
#define XHCI_SBRN_OFFSET	(0x60)

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/* Max number of USB devices for any host controller - limit in section 6.1 */
#define MAX_HC_SLOTS		256
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/* Section 5.3.3 - MaxPorts */
#define MAX_HC_PORTS		127
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/*
 * xHCI register interface.
 * This corresponds to the eXtensible Host Controller Interface (xHCI)
 * Revision 0.95 specification
 */

/**
 * struct xhci_cap_regs - xHCI Host Controller Capability Registers.
 * @hc_capbase:		length of the capabilities register and HC version number
 * @hcs_params1:	HCSPARAMS1 - Structural Parameters 1
 * @hcs_params2:	HCSPARAMS2 - Structural Parameters 2
 * @hcs_params3:	HCSPARAMS3 - Structural Parameters 3
 * @hcc_params:		HCCPARAMS - Capability Parameters
 * @db_off:		DBOFF - Doorbell array offset
 * @run_regs_off:	RTSOFF - Runtime register space offset
 */
struct xhci_cap_regs {
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	__le32	hc_capbase;
	__le32	hcs_params1;
	__le32	hcs_params2;
	__le32	hcs_params3;
	__le32	hcc_params;
	__le32	db_off;
	__le32	run_regs_off;
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	/* Reserved up to (CAPLENGTH - 0x1C) */
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};
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/* hc_capbase bitmasks */
/* bits 7:0 - how long is the Capabilities register */
#define HC_LENGTH(p)		XHCI_HC_LENGTH(p)
/* bits 31:16	*/
#define HC_VERSION(p)		(((p) >> 16) & 0xffff)

/* HCSPARAMS1 - hcs_params1 - bitmasks */
/* bits 0:7, Max Device Slots */
#define HCS_MAX_SLOTS(p)	(((p) >> 0) & 0xff)
#define HCS_SLOTS_MASK		0xff
/* bits 8:18, Max Interrupters */
#define HCS_MAX_INTRS(p)	(((p) >> 8) & 0x7ff)
/* bits 24:31, Max Ports - max value is 0x7F = 127 ports */
#define HCS_MAX_PORTS(p)	(((p) >> 24) & 0x7f)

/* HCSPARAMS2 - hcs_params2 - bitmasks */
/* bits 0:3, frames or uframes that SW needs to queue transactions
 * ahead of the HW to meet periodic deadlines */
#define HCS_IST(p)		(((p) >> 0) & 0xf)
/* bits 4:7, max number of Event Ring segments */
#define HCS_ERST_MAX(p)		(((p) >> 4) & 0xf)
/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
/* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
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#define HCS_MAX_SCRATCHPAD(p)   (((p) >> 27) & 0x1f)
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/* HCSPARAMS3 - hcs_params3 - bitmasks */
/* bits 0:7, Max U1 to U0 latency for the roothub ports */
#define HCS_U1_LATENCY(p)	(((p) >> 0) & 0xff)
/* bits 16:31, Max U2 to U0 latency for the roothub ports */
#define HCS_U2_LATENCY(p)	(((p) >> 16) & 0xffff)

/* HCCPARAMS - hcc_params - bitmasks */
/* true: HC can use 64-bit address pointers */
#define HCC_64BIT_ADDR(p)	((p) & (1 << 0))
/* true: HC can do bandwidth negotiation */
#define HCC_BANDWIDTH_NEG(p)	((p) & (1 << 1))
/* true: HC uses 64-byte Device Context structures
 * FIXME 64-byte context structures aren't supported yet.
 */
#define HCC_64BYTE_CONTEXT(p)	((p) & (1 << 2))
/* true: HC has port power switches */
#define HCC_PPC(p)		((p) & (1 << 3))
/* true: HC has port indicators */
#define HCS_INDICATOR(p)	((p) & (1 << 4))
/* true: HC has Light HC Reset Capability */
#define HCC_LIGHT_RESET(p)	((p) & (1 << 5))
/* true: HC supports latency tolerance messaging */
#define HCC_LTC(p)		((p) & (1 << 6))
/* true: no secondary Stream ID Support */
#define HCC_NSS(p)		((p) & (1 << 7))
/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
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#define HCC_MAX_PSA(p)		(1 << ((((p) >> 12) & 0xf) + 1))
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/* Extended Capabilities pointer from PCI base - section 5.3.6 */
#define HCC_EXT_CAPS(p)		XHCI_HCC_EXT_CAPS(p)

/* db_off bitmask - bits 0:1 reserved */
#define	DBOFF_MASK	(~0x3)

/* run_regs_off bitmask - bits 0:4 reserved */
#define	RTSOFF_MASK	(~0x1f)


/* Number of registers per port */
#define	NUM_PORT_REGS	4

/**
 * struct xhci_op_regs - xHCI Host Controller Operational Registers.
 * @command:		USBCMD - xHC command register
 * @status:		USBSTS - xHC status register
 * @page_size:		This indicates the page size that the host controller
 * 			supports.  If bit n is set, the HC supports a page size
 * 			of 2^(n+12), up to a 128MB page size.
 * 			4K is the minimum page size.
 * @cmd_ring:		CRP - 64-bit Command Ring Pointer
 * @dcbaa_ptr:		DCBAAP - 64-bit Device Context Base Address Array Pointer
 * @config_reg:		CONFIG - Configure Register
 * @port_status_base:	PORTSCn - base address for Port Status and Control
 * 			Each port has a Port Status and Control register,
 * 			followed by a Port Power Management Status and Control
 * 			register, a Port Link Info register, and a reserved
 * 			register.
 * @port_power_base:	PORTPMSCn - base address for
 * 			Port Power Management Status and Control
 * @port_link_base:	PORTLIn - base address for Port Link Info (current
 * 			Link PM state and control) for USB 2.1 and USB 3.0
 * 			devices.
 */
struct xhci_op_regs {
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	__le32	command;
	__le32	status;
	__le32	page_size;
	__le32	reserved1;
	__le32	reserved2;
	__le32	dev_notification;
	__le64	cmd_ring;
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	/* rsvd: offset 0x20-2F */
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	__le32	reserved3[4];
	__le64	dcbaa_ptr;
	__le32	config_reg;
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	/* rsvd: offset 0x3C-3FF */
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	__le32	reserved4[241];
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	/* port 1 registers, which serve as a base address for other ports */
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	__le32	port_status_base;
	__le32	port_power_base;
	__le32	port_link_base;
	__le32	reserved5;
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	/* registers for ports 2-255 */
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	__le32	reserved6[NUM_PORT_REGS*254];
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};
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/* USBCMD - USB command - command bitmasks */
/* start/stop HC execution - do not write unless HC is halted*/
#define CMD_RUN		XHCI_CMD_RUN
/* Reset HC - resets internal HC state machine and all registers (except
 * PCI config regs).  HC does NOT drive a USB reset on the downstream ports.
 * The xHCI driver must reinitialize the xHC after setting this bit.
 */
#define CMD_RESET	(1 << 1)
/* Event Interrupt Enable - a '1' allows interrupts from the host controller */
#define CMD_EIE		XHCI_CMD_EIE
/* Host System Error Interrupt Enable - get out-of-band signal for HC errors */
#define CMD_HSEIE	XHCI_CMD_HSEIE
/* bits 4:6 are reserved (and should be preserved on writes). */
/* light reset (port status stays unchanged) - reset completed when this is 0 */
#define CMD_LRESET	(1 << 7)
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/* host controller save/restore state. */
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#define CMD_CSS		(1 << 8)
#define CMD_CRS		(1 << 9)
/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
#define CMD_EWE		XHCI_CMD_EWE
/* MFINDEX power management - '1' means xHC can stop MFINDEX counter if all root
 * hubs are in U3 (selective suspend), disconnect, disabled, or powered-off.
 * '0' means the xHC can power it off if all ports are in the disconnect,
 * disabled, or powered-off state.
 */
#define CMD_PM_INDEX	(1 << 11)
/* bits 12:31 are reserved (and should be preserved on writes). */

/* USBSTS - USB status - status bitmasks */
/* HC not running - set to 1 when run/stop bit is cleared. */
#define STS_HALT	XHCI_STS_HALT
/* serious error, e.g. PCI parity error.  The HC will clear the run/stop bit. */
#define STS_FATAL	(1 << 2)
/* event interrupt - clear this prior to clearing any IP flags in IR set*/
#define STS_EINT	(1 << 3)
/* port change detect */
#define STS_PORT	(1 << 4)
/* bits 5:7 reserved and zeroed */
/* save state status - '1' means xHC is saving state */
#define STS_SAVE	(1 << 8)
/* restore state status - '1' means xHC is restoring state */
#define STS_RESTORE	(1 << 9)
/* true: save or restore error */
#define STS_SRE		(1 << 10)
/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
#define STS_CNR		XHCI_STS_CNR
/* true: internal Host Controller Error - SW needs to reset and reinitialize */
#define STS_HCE		(1 << 12)
/* bits 13:31 reserved and should be preserved */

/*
 * DNCTRL - Device Notification Control Register - dev_notification bitmasks
 * Generate a device notification event when the HC sees a transaction with a
 * notification type that matches a bit set in this bit field.
 */
#define	DEV_NOTE_MASK		(0xffff)
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#define ENABLE_DEV_NOTE(x)	(1 << (x))
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/* Most of the device notification types should only be used for debug.
 * SW does need to pay attention to function wake notifications.
 */
#define	DEV_NOTE_FWAKE		ENABLE_DEV_NOTE(1)

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/* CRCR - Command Ring Control Register - cmd_ring bitmasks */
/* bit 0 is the command ring cycle state */
/* stop ring operation after completion of the currently executing command */
#define CMD_RING_PAUSE		(1 << 1)
/* stop ring immediately - abort the currently executing command */
#define CMD_RING_ABORT		(1 << 2)
/* true: command ring is running */
#define CMD_RING_RUNNING	(1 << 3)
/* bits 4:5 reserved and should be preserved */
/* Command Ring pointer - bit mask for the lower 32 bits. */
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#define CMD_RING_RSVD_BITS	(0x3f)
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/* CONFIG - Configure Register - config_reg bitmasks */
/* bits 0:7 - maximum number of device slots enabled (NumSlotsEn) */
#define MAX_DEVS(p)	((p) & 0xff)
/* bits 8:31 - reserved and should be preserved */

/* PORTSC - Port Status and Control Register - port_status_base bitmasks */
/* true: device connected */
#define PORT_CONNECT	(1 << 0)
/* true: port enabled */
#define PORT_PE		(1 << 1)
/* bit 2 reserved and zeroed */
/* true: port has an over-current condition */
#define PORT_OC		(1 << 3)
/* true: port reset signaling asserted */
#define PORT_RESET	(1 << 4)
/* Port Link State - bits 5:8
 * A read gives the current link PM state of the port,
 * a write with Link State Write Strobe set sets the link state.
 */
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#define PORT_PLS_MASK	(0xf << 5)
#define XDEV_U0		(0x0 << 5)
#define XDEV_U3		(0x3 << 5)
#define XDEV_RESUME	(0xf << 5)
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/* true: port has power (see HCC_PPC) */
#define PORT_POWER	(1 << 9)
/* bits 10:13 indicate device speed:
 * 0 - undefined speed - port hasn't be initialized by a reset yet
 * 1 - full speed
 * 2 - low speed
 * 3 - high speed
 * 4 - super speed
 * 5-15 reserved
 */
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#define DEV_SPEED_MASK		(0xf << 10)
#define	XDEV_FS			(0x1 << 10)
#define	XDEV_LS			(0x2 << 10)
#define	XDEV_HS			(0x3 << 10)
#define	XDEV_SS			(0x4 << 10)
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#define DEV_UNDEFSPEED(p)	(((p) & DEV_SPEED_MASK) == (0x0<<10))
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#define DEV_FULLSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_FS)
#define DEV_LOWSPEED(p)		(((p) & DEV_SPEED_MASK) == XDEV_LS)
#define DEV_HIGHSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_HS)
#define DEV_SUPERSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_SS)
/* Bits 20:23 in the Slot Context are the speed for the device */
#define	SLOT_SPEED_FS		(XDEV_FS << 10)
#define	SLOT_SPEED_LS		(XDEV_LS << 10)
#define	SLOT_SPEED_HS		(XDEV_HS << 10)
#define	SLOT_SPEED_SS		(XDEV_SS << 10)
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/* Port Indicator Control */
#define PORT_LED_OFF	(0 << 14)
#define PORT_LED_AMBER	(1 << 14)
#define PORT_LED_GREEN	(2 << 14)
#define PORT_LED_MASK	(3 << 14)
/* Port Link State Write Strobe - set this when changing link state */
#define PORT_LINK_STROBE	(1 << 16)
/* true: connect status change */
#define PORT_CSC	(1 << 17)
/* true: port enable change */
#define PORT_PEC	(1 << 18)
/* true: warm reset for a USB 3.0 device is done.  A "hot" reset puts the port
 * into an enabled state, and the device into the default state.  A "warm" reset
 * also resets the link, forcing the device through the link training sequence.
 * SW can also look at the Port Reset register to see when warm reset is done.
 */
#define PORT_WRC	(1 << 19)
/* true: over-current change */
#define PORT_OCC	(1 << 20)
/* true: reset change - 1 to 0 transition of PORT_RESET */
#define PORT_RC		(1 << 21)
/* port link status change - set on some port link state transitions:
 *  Transition				Reason
 *  ------------------------------------------------------------------------------
 *  - U3 to Resume			Wakeup signaling from a device
 *  - Resume to Recovery to U0		USB 3.0 device resume
 *  - Resume to U0			USB 2.0 device resume
 *  - U3 to Recovery to U0		Software resume of USB 3.0 device complete
 *  - U3 to U0				Software resume of USB 2.0 device complete
 *  - U2 to U0				L1 resume of USB 2.1 device complete
 *  - U0 to U0 (???)			L1 entry rejection by USB 2.1 device
 *  - U0 to disabled			L1 entry error with USB 2.1 device
 *  - Any state to inactive		Error on USB 3.0 port
 */
#define PORT_PLC	(1 << 22)
/* port configure error change - port failed to configure its link partner */
#define PORT_CEC	(1 << 23)
/* bit 24 reserved */
/* wake on connect (enable) */
#define PORT_WKCONN_E	(1 << 25)
/* wake on disconnect (enable) */
#define PORT_WKDISC_E	(1 << 26)
/* wake on over-current (enable) */
#define PORT_WKOC_E	(1 << 27)
/* bits 28:29 reserved */
/* true: device is removable - for USB 3.0 roothub emulation */
#define PORT_DEV_REMOVE	(1 << 30)
/* Initiate a warm port reset - complete when PORT_WRC is '1' */
#define PORT_WR		(1 << 31)

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/* We mark duplicate entries with -1 */
#define DUPLICATE_ENTRY ((u8)(-1))

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/* Port Power Management Status and Control - port_power_base bitmasks */
/* Inactivity timer value for transitions into U1, in microseconds.
 * Timeout can be up to 127us.  0xFF means an infinite timeout.
 */
#define PORT_U1_TIMEOUT(p)	((p) & 0xff)
/* Inactivity timer value for transitions into U2 */
#define PORT_U2_TIMEOUT(p)	(((p) & 0xff) << 8)
/* Bits 24:31 for port testing */

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/* USB2 Protocol PORTSPMSC */
#define PORT_RWE	(1 << 0x3)
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/**
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 * struct xhci_intr_reg - Interrupt Register Set
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 * @irq_pending:	IMAN - Interrupt Management Register.  Used to enable
 *			interrupts and check for pending interrupts.
 * @irq_control:	IMOD - Interrupt Moderation Register.
 * 			Used to throttle interrupts.
 * @erst_size:		Number of segments in the Event Ring Segment Table (ERST).
 * @erst_base:		ERST base address.
 * @erst_dequeue:	Event ring dequeue pointer.
 *
 * Each interrupter (defined by a MSI-X vector) has an event ring and an Event
 * Ring Segment Table (ERST) associated with it.  The event ring is comprised of
 * multiple segments of the same size.  The HC places events on the ring and
 * "updates the Cycle bit in the TRBs to indicate to software the current
 * position of the Enqueue Pointer." The HCD (Linux) processes those events and
 * updates the dequeue pointer.
 */
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struct xhci_intr_reg {
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	__le32	irq_pending;
	__le32	irq_control;
	__le32	erst_size;
	__le32	rsvd;
	__le64	erst_base;
	__le64	erst_dequeue;
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};
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/* irq_pending bitmasks */
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#define	ER_IRQ_PENDING(p)	((p) & 0x1)
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/* bits 2:31 need to be preserved */
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/* THIS IS BUGGY - FIXME - IP IS WRITE 1 TO CLEAR */
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#define	ER_IRQ_CLEAR(p)		((p) & 0xfffffffe)
#define	ER_IRQ_ENABLE(p)	((ER_IRQ_CLEAR(p)) | 0x2)
#define	ER_IRQ_DISABLE(p)	((ER_IRQ_CLEAR(p)) & ~(0x2))

/* irq_control bitmasks */
/* Minimum interval between interrupts (in 250ns intervals).  The interval
 * between interrupts will be longer if there are no events on the event ring.
 * Default is 4000 (1 ms).
 */
#define ER_IRQ_INTERVAL_MASK	(0xffff)
/* Counter used to count down the time to the next interrupt - HW use only */
#define ER_IRQ_COUNTER_MASK	(0xffff << 16)

/* erst_size bitmasks */
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/* Preserve bits 16:31 of erst_size */
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#define	ERST_SIZE_MASK		(0xffff << 16)

/* erst_dequeue bitmasks */
/* Dequeue ERST Segment Index (DESI) - Segment number (or alias)
 * where the current dequeue pointer lies.  This is an optional HW hint.
 */
#define ERST_DESI_MASK		(0x7)
/* Event Handler Busy (EHB) - is the event ring scheduled to be serviced by
 * a work queue (or delayed service routine)?
 */
#define ERST_EHB		(1 << 3)
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#define ERST_PTR_MASK		(0xf)
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/**
 * struct xhci_run_regs
 * @microframe_index:
 * 		MFINDEX - current microframe number
 *
 * Section 5.5 Host Controller Runtime Registers:
 * "Software should read and write these registers using only Dword (32 bit)
 * or larger accesses"
 */
struct xhci_run_regs {
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	__le32			microframe_index;
	__le32			rsvd[7];
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	struct xhci_intr_reg	ir_set[128];
};
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/**
 * struct doorbell_array
 *
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 * Bits  0 -  7: Endpoint target
 * Bits  8 - 15: RsvdZ
 * Bits 16 - 31: Stream ID
 *
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 * Section 5.6
 */
struct xhci_doorbell_array {
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	__le32	doorbell[256];
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};
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#define DB_VALUE(ep, stream)	((((ep) + 1) & 0xff) | ((stream) << 16))
#define DB_VALUE_HOST		0x00000000
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/**
 * struct xhci_protocol_caps
 * @revision:		major revision, minor revision, capability ID,
 *			and next capability pointer.
 * @name_string:	Four ASCII characters to say which spec this xHC
 *			follows, typically "USB ".
 * @port_info:		Port offset, count, and protocol-defined information.
 */
struct xhci_protocol_caps {
	u32	revision;
	u32	name_string;
	u32	port_info;
};

#define	XHCI_EXT_PORT_MAJOR(x)	(((x) >> 24) & 0xff)
#define	XHCI_EXT_PORT_OFF(x)	((x) & 0xff)
#define	XHCI_EXT_PORT_COUNT(x)	(((x) >> 8) & 0xff)

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/**
 * struct xhci_container_ctx
 * @type: Type of context.  Used to calculated offsets to contained contexts.
 * @size: Size of the context data
 * @bytes: The raw context data given to HW
 * @dma: dma address of the bytes
 *
 * Represents either a Device or Input context.  Holds a pointer to the raw
 * memory used for the context (bytes) and dma address of it (dma).
 */
struct xhci_container_ctx {
	unsigned type;
#define XHCI_CTX_TYPE_DEVICE  0x1
#define XHCI_CTX_TYPE_INPUT   0x2

	int size;

	u8 *bytes;
	dma_addr_t dma;
};

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/**
 * struct xhci_slot_ctx
 * @dev_info:	Route string, device speed, hub info, and last valid endpoint
 * @dev_info2:	Max exit latency for device number, root hub port number
 * @tt_info:	tt_info is used to construct split transaction tokens
 * @dev_state:	slot state and device address
 *
 * Slot Context - section 6.2.1.1.  This assumes the HC uses 32-byte context
 * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
 * reserved at the end of the slot context for HC internal use.
 */
struct xhci_slot_ctx {
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	__le32	dev_info;
	__le32	dev_info2;
	__le32	tt_info;
	__le32	dev_state;
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	/* offset 0x10 to 0x1f reserved for HC internal use */
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	__le32	reserved[4];
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};
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/* dev_info bitmasks */
/* Route String - 0:19 */
#define ROUTE_STRING_MASK	(0xfffff)
/* Device speed - values defined by PORTSC Device Speed field - 20:23 */
#define DEV_SPEED	(0xf << 20)
/* bit 24 reserved */
/* Is this LS/FS device connected through a HS hub? - bit 25 */
#define DEV_MTT		(0x1 << 25)
/* Set if the device is a hub - bit 26 */
#define DEV_HUB		(0x1 << 26)
/* Index of the last valid endpoint context in this device context - 27:31 */
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#define LAST_CTX_MASK	(0x1f << 27)
#define LAST_CTX(p)	((p) << 27)
#define LAST_CTX_TO_EP_NUM(p)	(((p) >> 27) - 1)
#define SLOT_FLAG	(1 << 0)
#define EP0_FLAG	(1 << 1)
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/* dev_info2 bitmasks */
/* Max Exit Latency (ms) - worst case time to wake up all links in dev path */
#define MAX_EXIT	(0xffff)
/* Root hub port number that is needed to access the USB device */
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#define ROOT_HUB_PORT(p)	(((p) & 0xff) << 16)
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#define DEVINFO_TO_ROOT_HUB_PORT(p)	(((p) >> 16) & 0xff)
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/* Maximum number of ports under a hub device */
#define XHCI_MAX_PORTS(p)	(((p) & 0xff) << 24)
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/* tt_info bitmasks */
/*
 * TT Hub Slot ID - for low or full speed devices attached to a high-speed hub
 * The Slot ID of the hub that isolates the high speed signaling from
 * this low or full-speed device.  '0' if attached to root hub port.
 */
#define TT_SLOT		(0xff)
/*
 * The number of the downstream facing port of the high-speed hub
 * '0' if the device is not low or full speed.
 */
#define TT_PORT		(0xff << 8)
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#define TT_THINK_TIME(p)	(((p) & 0x3) << 16)
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/* dev_state bitmasks */
/* USB device address - assigned by the HC */
557
#define DEV_ADDR_MASK	(0xff)
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/* bits 8:26 reserved */
/* Slot state */
#define SLOT_STATE	(0x1f << 27)
561
#define GET_SLOT_STATE(p)	(((p) & (0x1f << 27)) >> 27)
562

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#define SLOT_STATE_DISABLED	0
#define SLOT_STATE_ENABLED	SLOT_STATE_DISABLED
#define SLOT_STATE_DEFAULT	1
#define SLOT_STATE_ADDRESSED	2
#define SLOT_STATE_CONFIGURED	3
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/**
 * struct xhci_ep_ctx
 * @ep_info:	endpoint state, streams, mult, and interval information.
 * @ep_info2:	information on endpoint type, max packet size, max burst size,
 * 		error count, and whether the HC will force an event for all
 * 		transactions.
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 * @deq:	64-bit ring dequeue pointer address.  If the endpoint only
 * 		defines one stream, this points to the endpoint transfer ring.
 * 		Otherwise, it points to a stream context array, which has a
 * 		ring pointer for each flow.
 * @tx_info:
 * 		Average TRB lengths for the endpoint ring and
 * 		max payload within an Endpoint Service Interval Time (ESIT).
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 *
 * Endpoint Context - section 6.2.1.2.  This assumes the HC uses 32-byte context
 * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
 * reserved at the end of the endpoint context for HC internal use.
 */
struct xhci_ep_ctx {
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	__le32	ep_info;
	__le32	ep_info2;
	__le64	deq;
	__le32	tx_info;
592
	/* offset 0x14 - 0x1f reserved for HC internal use */
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	__le32	reserved[3];
594
};
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/* ep_info bitmasks */
/*
 * Endpoint State - bits 0:2
 * 0 - disabled
 * 1 - running
 * 2 - halted due to halt condition - ok to manipulate endpoint ring
 * 3 - stopped
 * 4 - TRB error
 * 5-7 - reserved
 */
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#define EP_STATE_MASK		(0xf)
#define EP_STATE_DISABLED	0
#define EP_STATE_RUNNING	1
#define EP_STATE_HALTED		2
#define EP_STATE_STOPPED	3
#define EP_STATE_ERROR		4
612
/* Mult - Max number of burtst within an interval, in EP companion desc. */
613
#define EP_MULT(p)		(((p) & 0x3) << 8)
614
#define CTX_TO_EP_MULT(p)	(((p) >> 8) & 0x3)
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/* bits 10:14 are Max Primary Streams */
/* bit 15 is Linear Stream Array */
/* Interval - period between requests to an endpoint - 125u increments. */
618
#define EP_INTERVAL(p)		(((p) & 0xff) << 16)
619
#define EP_INTERVAL_TO_UFRAMES(p)		(1 << (((p) >> 16) & 0xff))
620
#define CTX_TO_EP_INTERVAL(p)	(((p) >> 16) & 0xff)
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#define EP_MAXPSTREAMS_MASK	(0x1f << 10)
#define EP_MAXPSTREAMS(p)	(((p) << 10) & EP_MAXPSTREAMS_MASK)
/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
#define	EP_HAS_LSA		(1 << 15)
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/* ep_info2 bitmasks */
/*
 * Force Event - generate transfer events for all TRBs for this endpoint
 * This will tell the HC to ignore the IOC and ISP flags (for debugging only).
 */
#define	FORCE_EVENT	(0x1)
#define ERROR_COUNT(p)	(((p) & 0x3) << 1)
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#define CTX_TO_EP_TYPE(p)	(((p) >> 3) & 0x7)
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#define EP_TYPE(p)	((p) << 3)
#define ISOC_OUT_EP	1
#define BULK_OUT_EP	2
#define INT_OUT_EP	3
#define CTRL_EP		4
#define ISOC_IN_EP	5
#define BULK_IN_EP	6
#define INT_IN_EP	7
/* bit 6 reserved */
/* bit 7 is Host Initiate Disable - for disabling stream selection */
#define MAX_BURST(p)	(((p)&0xff) << 8)
645
#define CTX_TO_MAX_BURST(p)	(((p) >> 8) & 0xff)
646
#define MAX_PACKET(p)	(((p)&0xffff) << 16)
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#define MAX_PACKET_MASK		(0xffff << 16)
#define MAX_PACKET_DECODED(p)	(((p) >> 16) & 0xffff)
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/* Get max packet size from ep desc. Bit 10..0 specify the max packet size.
 * USB2.0 spec 9.6.6.
 */
#define GET_MAX_PACKET(p)	((p) & 0x7ff)

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/* tx_info bitmasks */
#define AVG_TRB_LENGTH_FOR_EP(p)	((p) & 0xffff)
#define MAX_ESIT_PAYLOAD_FOR_EP(p)	(((p) & 0xffff) << 16)
658
#define CTX_TO_MAX_ESIT_PAYLOAD(p)	(((p) >> 16) & 0xffff)
659

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/* deq bitmasks */
#define EP_CTX_CYCLE_MASK		(1 << 0)

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/**
665 666
 * struct xhci_input_control_context
 * Input control context; see section 6.2.5.
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 *
 * @drop_context:	set the bit of the endpoint context you want to disable
 * @add_context:	set the bit of the endpoint context you want to enable
 */
671
struct xhci_input_control_ctx {
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	__le32	drop_flags;
	__le32	add_flags;
	__le32	rsvd2[6];
675
};
676

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#define	EP_IS_ADDED(ctrl_ctx, i) \
	(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1)))
#define	EP_IS_DROPPED(ctrl_ctx, i)       \
	(le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1)))

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/* Represents everything that is needed to issue a command on the command ring.
 * It's useful to pre-allocate these for commands that cannot fail due to
 * out-of-memory errors, like freeing streams.
 */
struct xhci_command {
	/* Input context for changing device state */
	struct xhci_container_ctx	*in_ctx;
	u32				status;
	/* If completion is null, no one is waiting on this command
	 * and the structure can be freed after the command completes.
	 */
	struct completion		*completion;
	union xhci_trb			*command_trb;
	struct list_head		cmd_list;
};

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/* drop context bitmasks */
#define	DROP_EP(x)	(0x1 << x)
/* add context bitmasks */
#define	ADD_EP(x)	(0x1 << x)

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struct xhci_stream_ctx {
	/* 64-bit stream ring address, cycle state, and stream type */
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	__le64	stream_ring;
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	/* offset 0x14 - 0x1f reserved for HC internal use */
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	__le32	reserved[2];
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};

/* Stream Context Types (section 6.4.1) - bits 3:1 of stream ctx deq ptr */
#define	SCT_FOR_CTX(p)		(((p) << 1) & 0x7)
/* Secondary stream array type, dequeue pointer is to a transfer ring */
#define	SCT_SEC_TR		0
/* Primary stream array type, dequeue pointer is to a transfer ring */
#define	SCT_PRI_TR		1
/* Dequeue pointer is for a secondary stream array (SSA) with 8 entries */
#define SCT_SSA_8		2
#define SCT_SSA_16		3
#define SCT_SSA_32		4
#define SCT_SSA_64		5
#define SCT_SSA_128		6
#define SCT_SSA_256		7

/* Assume no secondary streams for now */
struct xhci_stream_info {
	struct xhci_ring		**stream_rings;
	/* Number of streams, including stream 0 (which drivers can't use) */
	unsigned int			num_streams;
	/* The stream context array may be bigger than
	 * the number of streams the driver asked for
	 */
	struct xhci_stream_ctx		*stream_ctx_array;
	unsigned int			num_stream_ctxs;
	dma_addr_t			ctx_array_dma;
	/* For mapping physical TRB addresses to segments in stream rings */
	struct radix_tree_root		trb_address_map;
	struct xhci_command		*free_streams_command;
};

#define	SMALL_STREAM_ARRAY_SIZE		256
#define	MEDIUM_STREAM_ARRAY_SIZE	1024

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/* Some Intel xHCI host controllers need software to keep track of the bus
 * bandwidth.  Keep track of endpoint info here.  Each root port is allocated
 * the full bus bandwidth.  We must also treat TTs (including each port under a
 * multi-TT hub) as a separate bandwidth domain.  The direct memory interface
 * (DMI) also limits the total bandwidth (across all domains) that can be used.
 */
struct xhci_bw_info {
750
	/* ep_interval is zero-based */
751
	unsigned int		ep_interval;
752
	/* mult and num_packets are one-based */
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	unsigned int		mult;
	unsigned int		num_packets;
	unsigned int		max_packet_size;
	unsigned int		max_esit_payload;
	unsigned int		type;
};

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/* "Block" sizes in bytes the hardware uses for different device speeds.
 * The logic in this part of the hardware limits the number of bits the hardware
 * can use, so must represent bandwidth in a less precise manner to mimic what
 * the scheduler hardware computes.
 */
#define	FS_BLOCK	1
#define	HS_BLOCK	4
#define	SS_BLOCK	16
#define	DMI_BLOCK	32

/* Each device speed has a protocol overhead (CRC, bit stuffing, etc) associated
 * with each byte transferred.  SuperSpeed devices have an initial overhead to
 * set up bursts.  These are in blocks, see above.  LS overhead has already been
 * translated into FS blocks.
 */
#define DMI_OVERHEAD 8
#define DMI_OVERHEAD_BURST 4
#define SS_OVERHEAD 8
#define SS_OVERHEAD_BURST 32
#define HS_OVERHEAD 26
#define FS_OVERHEAD 20
#define LS_OVERHEAD 128
/* The TTs need to claim roughly twice as much bandwidth (94 bytes per
 * microframe ~= 24Mbps) of the HS bus as the devices can actually use because
 * of overhead associated with split transfers crossing microframe boundaries.
 * 31 blocks is pure protocol overhead.
 */
#define TT_HS_OVERHEAD (31 + 94)
#define TT_DMI_OVERHEAD (25 + 12)

/* Bandwidth limits in blocks */
#define FS_BW_LIMIT		1285
#define TT_BW_LIMIT		1320
#define HS_BW_LIMIT		1607
#define SS_BW_LIMIT_IN		3906
#define DMI_BW_LIMIT_IN		3906
#define SS_BW_LIMIT_OUT		3906
#define DMI_BW_LIMIT_OUT	3906

/* Percentage of bus bandwidth reserved for non-periodic transfers */
#define FS_BW_RESERVED		10
#define HS_BW_RESERVED		20
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#define SS_BW_RESERVED		10
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struct xhci_virt_ep {
	struct xhci_ring		*ring;
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	/* Related to endpoints that are configured to use stream IDs only */
	struct xhci_stream_info		*stream_info;
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	/* Temporary storage in case the configure endpoint command fails and we
	 * have to restore the device state to the previous state
	 */
	struct xhci_ring		*new_ring;
	unsigned int			ep_state;
#define SET_DEQ_PENDING		(1 << 0)
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#define EP_HALTED		(1 << 1)	/* For stall handling */
#define EP_HALT_PENDING		(1 << 2)	/* For URB cancellation */
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/* Transitioning the endpoint to using streams, don't enqueue URBs */
#define EP_GETTING_STREAMS	(1 << 3)
#define EP_HAS_STREAMS		(1 << 4)
/* Transitioning the endpoint to not using streams, don't enqueue URBs */
#define EP_GETTING_NO_STREAMS	(1 << 5)
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	/* ----  Related to URB cancellation ---- */
	struct list_head	cancelled_td_list;
	/* The TRB that was last reported in a stopped endpoint ring */
	union xhci_trb		*stopped_trb;
	struct xhci_td		*stopped_td;
826
	unsigned int		stopped_stream;
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	/* Watchdog timer for stop endpoint command to cancel URBs */
	struct timer_list	stop_cmd_timer;
	int			stop_cmds_pending;
	struct xhci_hcd		*xhci;
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	/* Dequeue pointer and dequeue segment for a submitted Set TR Dequeue
	 * command.  We'll need to update the ring's dequeue segment and dequeue
	 * pointer after the command completes.
	 */
	struct xhci_segment	*queued_deq_seg;
	union xhci_trb		*queued_deq_ptr;
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	/*
	 * Sometimes the xHC can not process isochronous endpoint ring quickly
	 * enough, and it will miss some isoc tds on the ring and generate
	 * a Missed Service Error Event.
	 * Set skip flag when receive a Missed Service Error Event and
	 * process the missed tds on the endpoint ring.
	 */
	bool			skip;
845
	/* Bandwidth checking storage */
846
	struct xhci_bw_info	bw_info;
847
	struct list_head	bw_endpoint_list;
848 849
};

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enum xhci_overhead_type {
	LS_OVERHEAD_TYPE = 0,
	FS_OVERHEAD_TYPE,
	HS_OVERHEAD_TYPE,
};

struct xhci_interval_bw {
	unsigned int		num_packets;
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	/* Sorted by max packet size.
	 * Head of the list is the greatest max packet size.
	 */
	struct list_head	endpoints;
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	/* How many endpoints of each speed are present. */
	unsigned int		overhead[3];
};

#define	XHCI_MAX_INTERVAL	16

struct xhci_interval_bw_table {
	unsigned int		interval0_esit_payload;
	struct xhci_interval_bw	interval_bw[XHCI_MAX_INTERVAL];
871 872
	/* Includes reserved bandwidth for async endpoints */
	unsigned int		bw_used;
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	unsigned int		ss_bw_in;
	unsigned int		ss_bw_out;
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};


878
struct xhci_virt_device {
879
	struct usb_device		*udev;
880 881 882 883 884 885 886 887
	/*
	 * Commands to the hardware are passed an "input context" that
	 * tells the hardware what to change in its data structures.
	 * The hardware will return changes in an "output context" that
	 * software must allocate for the hardware.  We need to keep
	 * track of input and output contexts separately because
	 * these commands might fail and we don't trust the hardware.
	 */
888
	struct xhci_container_ctx       *out_ctx;
889
	/* Used for addressing devices and configuration changes */
890
	struct xhci_container_ctx       *in_ctx;
891 892 893
	/* Rings saved to ensure old alt settings can be re-instated */
	struct xhci_ring		**ring_cache;
	int				num_rings_cached;
894 895
	/* Store xHC assigned device address */
	int				address;
896
#define	XHCI_MAX_RINGS_CACHED	31
897
	struct xhci_virt_ep		eps[31];
898
	struct completion		cmd_completion;
899 900
	/* Status of the last command issued for this device */
	u32				cmd_status;
901
	struct list_head		cmd_list;
902
	u8				fake_port;
903
	u8				real_port;
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	struct xhci_interval_bw_table	*bw_table;
	struct xhci_tt_bw_info		*tt_info;
};

/*
 * For each roothub, keep track of the bandwidth information for each periodic
 * interval.
 *
 * If a high speed hub is attached to the roothub, each TT associated with that
 * hub is a separate bandwidth domain.  The interval information for the
 * endpoints on the devices under that TT will appear in the TT structure.
 */
struct xhci_root_port_bw_info {
	struct list_head		tts;
	unsigned int			num_active_tts;
	struct xhci_interval_bw_table	bw_table;
};

struct xhci_tt_bw_info {
	struct list_head		tt_list;
	int				slot_id;
	int				ttport;
	struct xhci_interval_bw_table	bw_table;
	int				active_eps;
928 929 930
};


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/**
 * struct xhci_device_context_array
 * @dev_context_ptr	array of 64-bit DMA addresses for device contexts
 */
struct xhci_device_context_array {
	/* 64-bit device addresses; we only write 32-bit addresses */
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	__le64			dev_context_ptrs[MAX_HC_SLOTS];
938 939
	/* private xHCD pointers */
	dma_addr_t	dma;
940
};
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/* TODO: write function to set the 64-bit device DMA address */
/*
 * TODO: change this to be dynamically sized at HC mem init time since the HC
 * might not be able to handle the maximum number of devices possible.
 */


948 949
struct xhci_transfer_event {
	/* 64-bit buffer address, or immediate data */
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	__le64	buffer;
	__le32	transfer_len;
952
	/* This field is interpreted differently based on the type of TRB */
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	__le32	flags;
954
};
955

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/** Transfer Event bit fields **/
#define	TRB_TO_EP_ID(p)	(((p) >> 16) & 0x1f)

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/* Completion Code - only applicable for some types of TRBs */
#define	COMP_CODE_MASK		(0xff << 24)
#define GET_COMP_CODE(p)	(((p) & COMP_CODE_MASK) >> 24)
#define COMP_SUCCESS	1
/* Data Buffer Error */
#define COMP_DB_ERR	2
/* Babble Detected Error */
#define COMP_BABBLE	3
/* USB Transaction Error */
#define COMP_TX_ERR	4
/* TRB Error - some TRB field is invalid */
#define COMP_TRB_ERR	5
/* Stall Error - USB device is stalled */
#define COMP_STALL	6
/* Resource Error - HC doesn't have memory for that device configuration */
#define COMP_ENOMEM	7
/* Bandwidth Error - not enough room in schedule for this dev config */
#define COMP_BW_ERR	8
/* No Slots Available Error - HC ran out of device slots */
#define COMP_ENOSLOTS	9
/* Invalid Stream Type Error */
#define COMP_STREAM_ERR	10
/* Slot Not Enabled Error - doorbell rung for disabled device slot */
#define COMP_EBADSLT	11
/* Endpoint Not Enabled Error */
#define COMP_EBADEP	12
/* Short Packet */
#define COMP_SHORT_TX	13
/* Ring Underrun - doorbell rung for an empty isoc OUT ep ring */
#define COMP_UNDERRUN	14
/* Ring Overrun - isoc IN ep ring is empty when ep is scheduled to RX */
#define COMP_OVERRUN	15
/* Virtual Function Event Ring Full Error */
#define COMP_VF_FULL	16
/* Parameter Error - Context parameter is invalid */
#define COMP_EINVAL	17
/* Bandwidth Overrun Error - isoc ep exceeded its allocated bandwidth */
#define COMP_BW_OVER	18
/* Context State Error - illegal context state transition requested */
#define COMP_CTX_STATE	19
/* No Ping Response Error - HC didn't get PING_RESPONSE in time to TX */
#define COMP_PING_ERR	20
/* Event Ring is full */
#define COMP_ER_FULL	21
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/* Incompatible Device Error */
#define COMP_DEV_ERR	22
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/* Missed Service Error - HC couldn't service an isoc ep within interval */
#define COMP_MISSED_INT	23
/* Successfully stopped command ring */
#define COMP_CMD_STOP	24
/* Successfully aborted current command and stopped command ring */
#define COMP_CMD_ABORT	25
/* Stopped - transfer was terminated by a stop endpoint command */
#define COMP_STOP	26
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/* Same as COMP_EP_STOPPED, but the transferred length in the event is invalid */
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#define COMP_STOP_INVAL	27
/* Control Abort Error - Debug Capability - control pipe aborted */
#define COMP_DBG_ABORT	28
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/* Max Exit Latency Too Large Error */
#define COMP_MEL_ERR	29
/* TRB type 30 reserved */
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/* Isoc Buffer Overrun - an isoc IN ep sent more data than could fit in TD */
#define COMP_BUFF_OVER	31
/* Event Lost Error - xHC has an "internal event overrun condition" */
#define COMP_ISSUES	32
/* Undefined Error - reported when other error codes don't apply */
#define COMP_UNKNOWN	33
/* Invalid Stream ID Error */
#define COMP_STRID_ERR	34
/* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */
/* FIXME - check for this */
#define COMP_2ND_BW_ERR	35
/* Split Transaction Error */
#define	COMP_SPLIT_ERR	36

struct xhci_link_trb {
	/* 64-bit segment pointer*/
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	__le64 segment_ptr;
	__le32 intr_target;
	__le32 control;
1039
};
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/* control bitfields */
#define LINK_TOGGLE	(0x1<<1)

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/* Command completion event TRB */
struct xhci_event_cmd {
	/* Pointer to command TRB, or the value passed by the event data trb */
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	__le64 cmd_trb;
	__le32 status;
	__le32 flags;
1050
};
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/* flags bitmasks */
/* bits 16:23 are the virtual function ID */
/* bits 24:31 are the slot ID */
#define TRB_TO_SLOT_ID(p)	(((p) & (0xff<<24)) >> 24)
#define SLOT_ID_FOR_TRB(p)	(((p) & 0xff) << 24)
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/* Stop Endpoint TRB - ep_index to endpoint ID for this TRB */
#define TRB_TO_EP_INDEX(p)		((((p) & (0x1f << 16)) >> 16) - 1)
#define	EP_ID_FOR_TRB(p)		((((p) + 1) & 0x1f) << 16)

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#define SUSPEND_PORT_FOR_TRB(p)		(((p) & 1) << 23)
#define TRB_TO_SUSPEND_PORT(p)		(((p) & (1 << 23)) >> 23)
#define LAST_EP_INDEX			30

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/* Set TR Dequeue Pointer command TRB fields */
#define TRB_TO_STREAM_ID(p)		((((p) & (0xffff << 16)) >> 16))
#define STREAM_ID_FOR_TRB(p)		((((p)) & 0xffff) << 16)

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/* Port Status Change Event TRB fields */
/* Port ID - bits 31:24 */
#define GET_PORT_ID(p)		(((p) & (0xff << 24)) >> 24)

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/* Normal TRB fields */
/* transfer_len bitmasks - bits 0:16 */
#define	TRB_LEN(p)		((p) & 0x1ffff)
/* Interrupter Target - which MSI-X vector to target the completion event at */
#define TRB_INTR_TARGET(p)	(((p) & 0x3ff) << 22)
#define GET_INTR_TARGET(p)	(((p) >> 22) & 0x3ff)
1081
#define TRB_TBC(p)		(((p) & 0x3) << 7)
1082
#define TRB_TLBPC(p)		(((p) & 0xf) << 16)
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101

/* Cycle bit - indicates TRB ownership by HC or HCD */
#define TRB_CYCLE		(1<<0)
/*
 * Force next event data TRB to be evaluated before task switch.
 * Used to pass OS data back after a TD completes.
 */
#define TRB_ENT			(1<<1)
/* Interrupt on short packet */
#define TRB_ISP			(1<<2)
/* Set PCIe no snoop attribute */
#define TRB_NO_SNOOP		(1<<3)
/* Chain multiple TRBs into a TD */
#define TRB_CHAIN		(1<<4)
/* Interrupt on completion */
#define TRB_IOC			(1<<5)
/* The buffer pointer contains immediate data */
#define TRB_IDT			(1<<6)

1102 1103
/* Block Event Interrupt */
#define	TRB_BEI			(1<<9)
1104 1105 1106

/* Control transfer TRB specific fields */
#define TRB_DIR_IN		(1<<16)
1107 1108 1109
#define	TRB_TX_TYPE(p)		((p) << 16)
#define	TRB_DATA_OUT		2
#define	TRB_DATA_IN		3
1110

1111 1112 1113
/* Isochronous TRB specific fields */
#define TRB_SIA			(1<<31)

1114
struct xhci_generic_trb {
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	__le32 field[4];
1116
};
1117 1118 1119 1120 1121 1122 1123 1124

union xhci_trb {
	struct xhci_link_trb		link;
	struct xhci_transfer_event	trans_event;
	struct xhci_event_cmd		event_cmd;
	struct xhci_generic_trb		generic;
};

1125 1126 1127
/* TRB bit mask */
#define	TRB_TYPE_BITMASK	(0xfc00)
#define TRB_TYPE(p)		((p) << 10)
1128
#define TRB_FIELD_TO_TYPE(p)	(((p) & TRB_TYPE_BITMASK) >> 10)
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
/* TRB type IDs */
/* bulk, interrupt, isoc scatter/gather, and control data stage */
#define TRB_NORMAL		1
/* setup stage for control transfers */
#define TRB_SETUP		2
/* data stage for control transfers */
#define TRB_DATA		3
/* status stage for control transfers */
#define TRB_STATUS		4
/* isoc transfers */
#define TRB_ISOC		5
/* TRB for linking ring segments */
#define TRB_LINK		6
#define TRB_EVENT_DATA		7
/* Transfer Ring No-op (not for the command ring) */
#define TRB_TR_NOOP		8
/* Command TRBs */
/* Enable Slot Command */
#define TRB_ENABLE_SLOT		9
/* Disable Slot Command */
#define TRB_DISABLE_SLOT	10
/* Address Device Command */
#define TRB_ADDR_DEV		11
/* Configure Endpoint Command */
#define TRB_CONFIG_EP		12
/* Evaluate Context Command */
#define TRB_EVAL_CONTEXT	13
1156 1157
/* Reset Endpoint Command */
#define TRB_RESET_EP		14
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
/* Stop Transfer Ring Command */
#define TRB_STOP_RING		15
/* Set Transfer Ring Dequeue Pointer Command */
#define TRB_SET_DEQ		16
/* Reset Device Command */
#define TRB_RESET_DEV		17
/* Force Event Command (opt) */
#define TRB_FORCE_EVENT		18
/* Negotiate Bandwidth Command (opt) */
#define TRB_NEG_BANDWIDTH	19
/* Set Latency Tolerance Value Command (opt) */
#define TRB_SET_LT		20
/* Get port bandwidth Command */
#define TRB_GET_BW		21
/* Force Header Command - generate a transaction or link management packet */
#define TRB_FORCE_HEADER	22
/* No-op Command - not for transfer rings */
#define TRB_CMD_NOOP		23
/* TRB IDs 24-31 reserved */
/* Event TRBS */
/* Transfer Event */
#define TRB_TRANSFER		32
/* Command Completion Event */
#define TRB_COMPLETION		33
/* Port Status Change Event */
#define TRB_PORT_STATUS		34
/* Bandwidth Request Event (opt) */
#define TRB_BANDWIDTH_EVENT	35
/* Doorbell Event (opt) */
#define TRB_DOORBELL		36
/* Host Controller Event */
#define TRB_HC_EVENT		37
/* Device Notification Event - device sent function wake notification */
#define TRB_DEV_NOTE		38
/* MFINDEX Wrap Event - microframe counter wrapped */
#define TRB_MFINDEX_WRAP	39
/* TRB IDs 40-47 reserved, 48-63 is vendor-defined */

1196 1197 1198 1199 1200
/* Nec vendor-specific command completion event. */
#define	TRB_NEC_CMD_COMP	48
/* Get NEC firmware revision. */
#define	TRB_NEC_GET_FW		49

1201 1202 1203 1204 1205 1206 1207
#define TRB_TYPE_LINK(x)	(((x) & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
/* Above, but for __le32 types -- can avoid work by swapping constants: */
#define TRB_TYPE_LINK_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
				 cpu_to_le32(TRB_TYPE(TRB_LINK)))
#define TRB_TYPE_NOOP_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
				 cpu_to_le32(TRB_TYPE(TRB_TR_NOOP)))

1208 1209 1210
#define NEC_FW_MINOR(p)		(((p) >> 0) & 0xff)
#define NEC_FW_MAJOR(p)		(((p) >> 8) & 0xff)

1211 1212 1213 1214 1215 1216
/*
 * TRBS_PER_SEGMENT must be a multiple of 4,
 * since the command ring is 64-byte aligned.
 * It must also be greater than 16.
 */
#define TRBS_PER_SEGMENT	64
1217 1218
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS	(TRBS_PER_SEGMENT - 3)
1219
#define SEGMENT_SIZE		(TRBS_PER_SEGMENT*16)
1220 1221 1222 1223
/* SEGMENT_SHIFT should be log2(SEGMENT_SIZE).
 * Change this if you change TRBS_PER_SEGMENT!
 */
#define SEGMENT_SHIFT		10
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/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT		16
#define TRB_MAX_BUFF_SIZE	(1 << TRB_MAX_BUFF_SHIFT)
1227 1228 1229 1230 1231 1232

struct xhci_segment {
	union xhci_trb		*trbs;
	/* private to HCD */
	struct xhci_segment	*next;
	dma_addr_t		dma;
1233
};
1234

1235 1236 1237 1238 1239 1240 1241 1242 1243
struct xhci_td {
	struct list_head	td_list;
	struct list_head	cancelled_td_list;
	struct urb		*urb;
	struct xhci_segment	*start_seg;
	union xhci_trb		*first_trb;
	union xhci_trb		*last_trb;
};

1244 1245 1246 1247 1248 1249
struct xhci_dequeue_state {
	struct xhci_segment *new_deq_seg;
	union xhci_trb *new_deq_ptr;
	int new_cycle_state;
};

1250 1251 1252
struct xhci_ring {
	struct xhci_segment	*first_seg;
	union  xhci_trb		*enqueue;
1253 1254
	struct xhci_segment	*enq_seg;
	unsigned int		enq_updates;
1255
	union  xhci_trb		*dequeue;
1256 1257
	struct xhci_segment	*deq_seg;
	unsigned int		deq_updates;
1258
	struct list_head	td_list;
1259 1260 1261 1262 1263 1264
	/*
	 * Write the cycle state into the TRB cycle field to give ownership of
	 * the TRB to the host controller (if we are the producer), or to check
	 * if we own the TRB (if we are the consumer).  See section 4.9.1.
	 */
	u32			cycle_state;
1265
	unsigned int		stream_id;
1266
	bool			last_td_was_short;
1267 1268 1269 1270
};

struct xhci_erst_entry {
	/* 64-bit event ring segment address */
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	__le64	seg_addr;
	__le32	seg_size;
1273
	/* Set to zero */
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	__le32	rsvd;
1275
};
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285

struct xhci_erst {
	struct xhci_erst_entry	*entries;
	unsigned int		num_entries;
	/* xhci->event_ring keeps track of segment dma addresses */
	dma_addr_t		erst_dma_addr;
	/* Num entries the ERST can contain */
	unsigned int		erst_size;
};

1286 1287 1288 1289 1290 1291 1292
struct xhci_scratchpad {
	u64 *sp_array;
	dma_addr_t sp_dma;
	void **sp_buffers;
	dma_addr_t *sp_dma_buffers;
};

1293 1294 1295 1296 1297 1298
struct urb_priv {
	int	length;
	int	td_cnt;
	struct	xhci_td	*td[0];
};

1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
/*
 * Each segment table entry is 4*32bits long.  1K seems like an ok size:
 * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table,
 * meaning 64 ring segments.
 * Initial allocated size of the ERST, in number of entries */
#define	ERST_NUM_SEGS	1
/* Initial allocated size of the ERST, in number of entries */
#define	ERST_SIZE	64
/* Initial number of event segment rings allocated */
#define	ERST_ENTRIES	1
1309 1310
/* Poll every 60 seconds */
#define	POLL_TIMEOUT	60
1311 1312
/* Stop endpoint command timeout (secs) for URB cancellation watchdog timer */
#define XHCI_STOP_EP_CMD_TIMEOUT	5
1313 1314
/* XXX: Make these module parameters */

1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
struct s3_save {
	u32	command;
	u32	dev_nt;
	u64	dcbaa_ptr;
	u32	config_reg;
	u32	irq_pending;
	u32	irq_control;
	u32	erst_size;
	u64	erst_base;
	u64	erst_dequeue;
};
1326

1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
struct xhci_bus_state {
	unsigned long		bus_suspended;
	unsigned long		next_statechange;

	/* Port suspend arrays are indexed by the portnum of the fake roothub */
	/* ports suspend status arrays - max 31 ports for USB2, 15 for USB3 */
	u32			port_c_suspend;
	u32			suspended_ports;
	unsigned long		resume_done[USB_MAXCHILDREN];
};

static inline unsigned int hcd_index(struct usb_hcd *hcd)
{
1340 1341 1342 1343
	if (hcd->speed == HCD_USB3)
		return 0;
	else
		return 1;
1344 1345
}

1346 1347
/* There is one ehci_hci structure per controller */
struct xhci_hcd {
1348
	struct usb_hcd *main_hcd;
1349
	struct usb_hcd *shared_hcd;
1350 1351 1352 1353
	/* glue to PCI and HCD framework */
	struct xhci_cap_regs __iomem *cap_regs;
	struct xhci_op_regs __iomem *op_regs;
	struct xhci_run_regs __iomem *run_regs;
1354
	struct xhci_doorbell_array __iomem *dba;
1355
	/* Our HCD's current interrupter register set */
1356
	struct	xhci_intr_reg __iomem *ir_set;
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374

	/* Cached register copies of read-only HC data */
	__u32		hcs_params1;
	__u32		hcs_params2;
	__u32		hcs_params3;
	__u32		hcc_params;

	spinlock_t	lock;

	/* packed release number */
	u8		sbrn;
	u16		hci_version;
	u8		max_slots;
	u8		max_interrupters;
	u8		max_ports;
	u8		isoc_threshold;
	int		event_ring_max;
	int		addr_64;
1375
	/* 4KB min, 128MB max */
1376
	int		page_size;
1377 1378
	/* Valid values are 12 to 20, inclusive */
	int		page_shift;
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	/* msi-x vectors */
1380 1381
	int		msix_count;
	struct msix_entry	*msix_entries;
1382
	/* data structures */
1383
	struct xhci_device_context_array *dcbaa;
1384
	struct xhci_ring	*cmd_ring;
1385
	unsigned int		cmd_ring_reserved_trbs;
1386 1387
	struct xhci_ring	*event_ring;
	struct xhci_erst	erst;
1388 1389 1390
	/* Scratchpad */
	struct xhci_scratchpad  *scratchpad;

1391 1392 1393 1394 1395
	/* slot enabling and address device helpers */
	struct completion	addr_dev;
	int slot_id;
	/* Internal mirror of the HW's dcbaa */
	struct xhci_virt_device	*devs[MAX_HC_SLOTS];
1396 1397
	/* For keeping track of bandwidth domains per roothub. */
	struct xhci_root_port_bw_info	*rh_bw;
1398 1399 1400 1401

	/* DMA pools */
	struct dma_pool	*device_pool;
	struct dma_pool	*segment_pool;
1402 1403
	struct dma_pool	*small_streams_pool;
	struct dma_pool	*medium_streams_pool;
1404 1405 1406 1407 1408 1409

#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
	/* Poll the rings - for debugging */
	struct timer_list	event_ring_timer;
	int			zombie;
#endif
1410 1411
	/* Host controller watchdog timer structures */
	unsigned int		xhc_state;
1412 1413

	u32			command;
1414
	struct s3_save		s3;
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
/* Host controller is dying - not responding to commands. "I'm not dead yet!"
 *
 * xHC interrupts have been disabled and a watchdog timer will (or has already)
 * halt the xHCI host, and complete all URBs with an -ESHUTDOWN code.  Any code
 * that sees this status (other than the timer that set it) should stop touching
 * hardware immediately.  Interrupt handlers should return immediately when
 * they see this status (any time they drop and re-acquire xhci->lock).
 * xhci_urb_dequeue() should call usb_hcd_check_unlink_urb() and return without
 * putting the TD on the canceled list, etc.
 *
 * There are no reports of xHCI host controllers that display this issue.
 */
#define XHCI_STATE_DYING	(1 << 0)
1428
#define XHCI_STATE_HALTED	(1 << 1)
1429 1430
	/* Statistics */
	int			error_bitmask;
1431 1432
	unsigned int		quirks;
#define	XHCI_LINK_TRB_QUIRK	(1 << 0)
1433
#define XHCI_RESET_EP_QUIRK	(1 << 1)
1434
#define XHCI_NEC_HOST		(1 << 2)
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#define XHCI_AMD_PLL_FIX	(1 << 3)
1436
#define XHCI_SPURIOUS_SUCCESS	(1 << 4)
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
/*
 * Certain Intel host controllers have a limit to the number of endpoint
 * contexts they can handle.  Ideally, they would signal that they can't handle
 * anymore endpoint contexts by returning a Resource Error for the Configure
 * Endpoint command, but they don't.  Instead they expect software to keep track
 * of the number of active endpoints for them, across configure endpoint
 * commands, reset device commands, disable slot commands, and address device
 * commands.
 */
#define XHCI_EP_LIMIT_QUIRK	(1 << 5)
1447
#define XHCI_BROKEN_MSI		(1 << 6)
1448
#define XHCI_RESET_ON_RESUME	(1 << 7)
1449
#define	XHCI_SW_BW_CHECKING	(1 << 8)
1450 1451
	unsigned int		num_active_eps;
	unsigned int		limit_active_eps;
1452 1453
	/* There are two roothubs to keep track of bus suspend info for */
	struct xhci_bus_state   bus_state[2];
1454 1455 1456
	/* Is each xHCI roothub port a USB 3.0, USB 2.0, or USB 1.1 port? */
	u8			*port_array;
	/* Array of pointers to USB 3.0 PORTSC registers */
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	__le32 __iomem		**usb3_ports;
1458 1459
	unsigned int		num_usb3_ports;
	/* Array of pointers to USB 2.0 PORTSC registers */
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	__le32 __iomem		**usb2_ports;
1461
	unsigned int		num_usb2_ports;
1462 1463 1464 1465 1466
};

/* convert between an HCD pointer and the corresponding EHCI_HCD */
static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
{
1467
	return *((struct xhci_hcd **) (hcd->hcd_priv));
1468 1469 1470 1471
}

static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
{
1472
	return xhci->main_hcd;
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
}

#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
#define XHCI_DEBUG	1
#else
#define XHCI_DEBUG	0
#endif

#define xhci_dbg(xhci, fmt, args...) \
	do { if (XHCI_DEBUG) dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_info(xhci, fmt, args...) \
	do { if (XHCI_DEBUG) dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_err(xhci, fmt, args...) \
	dev_err(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_warn(xhci, fmt, args...) \
	dev_warn(xhci_to_hcd(xhci)->self.controller , fmt , ## args)

/* TODO: copied from ehci.h - can be refactored? */
/* xHCI spec says all registers are little endian */
static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
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		__le32 __iomem *regs)
1494 1495 1496
{
	return readl(regs);
}
1497
static inline void xhci_writel(struct xhci_hcd *xhci,
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		const unsigned int val, __le32 __iomem *regs)
1499 1500 1501 1502
{
	writel(val, regs);
}

1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
/*
 * Registers should always be accessed with double word or quad word accesses.
 *
 * Some xHCI implementations may support 64-bit address pointers.  Registers
 * with 64-bit address pointers should be written to with dword accesses by
 * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second.
 * xHCI implementations that do not support 64-bit address pointers will ignore
 * the high dword, and write order is irrelevant.
 */
static inline u64 xhci_read_64(const struct xhci_hcd *xhci,
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		__le64 __iomem *regs)
1514 1515 1516 1517 1518 1519 1520
{
	__u32 __iomem *ptr = (__u32 __iomem *) regs;
	u64 val_lo = readl(ptr);
	u64 val_hi = readl(ptr + 1);
	return val_lo + (val_hi << 32);
}
static inline void xhci_write_64(struct xhci_hcd *xhci,
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1521
				 const u64 val, __le64 __iomem *regs)
1522 1523 1524 1525 1526 1527 1528 1529 1530
{
	__u32 __iomem *ptr = (__u32 __iomem *) regs;
	u32 val_lo = lower_32_bits(val);
	u32 val_hi = upper_32_bits(val);

	writel(val_lo, ptr);
	writel(val_hi, ptr + 1);
}

1531 1532
static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci)
{
1533
	return xhci->quirks & XHCI_LINK_TRB_QUIRK;
1534 1535
}

1536
/* xHCI debugging */
1537
void xhci_print_ir_set(struct xhci_hcd *xhci, int set_num);
1538
void xhci_print_registers(struct xhci_hcd *xhci);
1539 1540
void xhci_dbg_regs(struct xhci_hcd *xhci);
void xhci_print_run_regs(struct xhci_hcd *xhci);
1541 1542
void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb);
void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb);
1543
void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg);
1544 1545 1546
void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring);
void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci);
1547
void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring);
1548
void xhci_dbg_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int last_ep);
1549
char *xhci_get_slot_state(struct xhci_hcd *xhci,
1550
		struct xhci_container_ctx *ctx);
1551 1552 1553
void xhci_dbg_ep_rings(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		struct xhci_virt_ep *ep);
1554

1555
/* xHCI memory management */
1556 1557
void xhci_mem_cleanup(struct xhci_hcd *xhci);
int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
1558 1559 1560
void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id);
int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, struct usb_device *udev, gfp_t flags);
int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev);
1561 1562
void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
		struct usb_device *udev);
1563
unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc);
1564
unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc);
1565 1566
unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index);
unsigned int xhci_last_valid_endpoint(u32 added_ctxs);
1567
void xhci_endpoint_zero(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_host_endpoint *ep);
1568 1569 1570 1571 1572 1573 1574 1575 1576
void xhci_drop_ep_from_interval_table(struct xhci_hcd *xhci,
		struct xhci_bw_info *ep_bw,
		struct xhci_interval_bw_table *bw_table,
		struct usb_device *udev,
		struct xhci_virt_ep *virt_ep,
		struct xhci_tt_bw_info *tt_info);
void xhci_update_tt_active_eps(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		int old_active_eps);
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void xhci_clear_endpoint_bw_info(struct xhci_bw_info *bw_info);
void xhci_update_bw_info(struct xhci_hcd *xhci,
		struct xhci_container_ctx *in_ctx,
		struct xhci_input_control_ctx *ctrl_ctx,
		struct xhci_virt_device *virt_dev);
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void xhci_endpoint_copy(struct xhci_hcd *xhci,
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		struct xhci_container_ctx *in_ctx,
		struct xhci_container_ctx *out_ctx,
		unsigned int ep_index);
void xhci_slot_copy(struct xhci_hcd *xhci,
		struct xhci_container_ctx *in_ctx,
		struct xhci_container_ctx *out_ctx);
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int xhci_endpoint_init(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev,
		struct usb_device *udev, struct usb_host_endpoint *ep,
		gfp_t mem_flags);
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void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring);
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void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		unsigned int ep_index);
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struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
		unsigned int num_stream_ctxs,
		unsigned int num_streams, gfp_t flags);
void xhci_free_stream_info(struct xhci_hcd *xhci,
		struct xhci_stream_info *stream_info);
void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
		struct xhci_ep_ctx *ep_ctx,
		struct xhci_stream_info *stream_info);
void xhci_setup_no_streams_ep_input_ctx(struct xhci_hcd *xhci,
		struct xhci_ep_ctx *ep_ctx,
		struct xhci_virt_ep *ep);
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void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
	struct xhci_virt_device *virt_dev, bool drop_control_ep);
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struct xhci_ring *xhci_dma_to_transfer_ring(
		struct xhci_virt_ep *ep,
		u64 address);
struct xhci_ring *xhci_stream_id_to_ring(
		struct xhci_virt_device *dev,
		unsigned int ep_index,
		unsigned int stream_id);
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struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
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		bool allocate_in_ctx, bool allocate_completion,
		gfp_t mem_flags);
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void xhci_urb_free_priv(struct xhci_hcd *xhci, struct urb_priv *urb_priv);
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void xhci_free_command(struct xhci_hcd *xhci,
		struct xhci_command *command);
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#ifdef CONFIG_PCI
/* xHCI PCI glue */
int xhci_register_pci(void);
void xhci_unregister_pci(void);
#endif

/* xHCI host controller glue */
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void xhci_quiesce(struct xhci_hcd *xhci);
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int xhci_halt(struct xhci_hcd *xhci);
int xhci_reset(struct xhci_hcd *xhci);
int xhci_init(struct usb_hcd *hcd);
int xhci_run(struct usb_hcd *hcd);
void xhci_stop(struct usb_hcd *hcd);
void xhci_shutdown(struct usb_hcd *hcd);
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#ifdef	CONFIG_PM
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int xhci_suspend(struct xhci_hcd *xhci);
int xhci_resume(struct xhci_hcd *xhci, bool hibernated);
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#else
#define	xhci_suspend	NULL
#define	xhci_resume	NULL
#endif

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int xhci_get_frame(struct usb_hcd *hcd);
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irqreturn_t xhci_irq(struct usb_hcd *hcd);
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irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd);
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int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
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int xhci_alloc_tt_info(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		struct usb_device *hdev,
		struct usb_tt *tt, gfp_t mem_flags);
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int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		unsigned int num_streams, gfp_t mem_flags);
int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		gfp_t mem_flags);
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int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
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int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
			struct usb_tt *tt, gfp_t mem_flags);
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int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
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int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
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void xhci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep);
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int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev);
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int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
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/* xHCI ring, segment, TRB, and TD functions */
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dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
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struct xhci_segment *trb_in_td(struct xhci_segment *start_seg,
		union xhci_trb *start_trb, union xhci_trb *end_trb,
		dma_addr_t suspect_dma);
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int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code);
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void xhci_ring_cmd_db(struct xhci_hcd *xhci);
int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id);
int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
		u32 slot_id);
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int xhci_queue_vendor_command(struct xhci_hcd *xhci,
		u32 field1, u32 field2, u32 field3, u32 field4);
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int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
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		unsigned int ep_index, int suspend);
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int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
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int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
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int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags,
		struct urb *urb, int slot_id, unsigned int ep_index);
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int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
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		u32 slot_id, bool command_must_succeed);
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int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
1698
		u32 slot_id);
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int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id,
		unsigned int ep_index);
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int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id);
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void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
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		unsigned int stream_id, struct xhci_td *cur_td,
		struct xhci_dequeue_state *state);
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void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
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		unsigned int slot_id, unsigned int ep_index,
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		unsigned int stream_id,
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		struct xhci_dequeue_state *deq_state);
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void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
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		struct usb_device *udev, unsigned int ep_index);
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void xhci_queue_config_ep_quirk(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		struct xhci_dequeue_state *deq_state);
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void xhci_stop_endpoint_command_watchdog(unsigned long arg);
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void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
		unsigned int ep_index, unsigned int stream_id);
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/* xHCI roothub code */
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void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
				int port_id, u32 link_state);
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void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
				int port_id, u32 port_bit);
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int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
		char *buf, u16 wLength);
int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
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#ifdef CONFIG_PM
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int xhci_bus_suspend(struct usb_hcd *hcd);
int xhci_bus_resume(struct usb_hcd *hcd);
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#else
#define	xhci_bus_suspend	NULL
#define	xhci_bus_resume		NULL
#endif	/* CONFIG_PM */

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u32 xhci_port_state_to_neutral(u32 state);
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int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
		u16 port);
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void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);
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/* xHCI contexts */
struct xhci_input_control_ctx *xhci_get_input_control_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int ep_index);

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#endif /* __LINUX_XHCI_HCD_H */