Linux 4.16.11

[linux/fpc-iii.git] / drivers / usb / host / xhci.h

// SPDX-License-Identifier: GPL-2.0

/*
 * xHCI host controller driver
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 */

#ifndef __LINUX_XHCI_HCD_H
#define __LINUX_XHCI_HCD_H

#include <linux/usb.h>
#include <linux/timer.h>
#include <linux/kernel.h>
#include <linux/usb/hcd.h>
#include <linux/io-64-nonatomic-lo-hi.h>

/* Code sharing between pci-quirks and xhci hcd */
#include        "xhci-ext-caps.h"
#include "pci-quirks.h"

/* xHCI PCI Configuration Registers */
#define XHCI_SBRN_OFFSET        (0x60)

/* Max number of USB devices for any host controller - limit in section 6.1 */
#define MAX_HC_SLOTS            256
/* Section 5.3.3 - MaxPorts */
#define MAX_HC_PORTS            127

/*
 * 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
 * @hcc_params2:        HCCPARAMS2 Capability Parameters 2, xhci 1.1 only
 */
struct xhci_cap_regs {
        __le32  hc_capbase;
        __le32  hcs_params1;
        __le32  hcs_params2;
        __le32  hcs_params3;
        __le32  hcc_params;
        __le32  db_off;
        __le32  run_regs_off;
        __le32  hcc_params2; /* xhci 1.1 */
        /* Reserved up to (CAPLENGTH - 0x1C) */
};

/* 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)
/* bits 21:25 Hi 5 bits of Scratchpad buffers SW must allocate for the HW */
/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
/* bits 27:31 Lo 5 bits of Scratchpad buffers SW must allocate for the HW */
#define HCS_MAX_SCRATCHPAD(p)   ((((p) >> 16) & 0x3e0) | (((p) >> 27) & 0x1f))

/* 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))
/* true: HC supports Stopped - Short Packet */
#define HCC_SPC(p)              ((p) & (1 << 9))
/* true: HC has Contiguous Frame ID Capability */
#define HCC_CFC(p)              ((p) & (1 << 11))
/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
#define HCC_MAX_PSA(p)          (1 << ((((p) >> 12) & 0xf) + 1))
/* Extended Capabilities pointer from PCI base - section 5.3.6 */
#define HCC_EXT_CAPS(p)         XHCI_HCC_EXT_CAPS(p)

#define CTX_SIZE(_hcc)          (HCC_64BYTE_CONTEXT(_hcc) ? 64 : 32)

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

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

/* HCCPARAMS2 - hcc_params2 - bitmasks */
/* true: HC supports U3 entry Capability */
#define HCC2_U3C(p)             ((p) & (1 << 0))
/* true: HC supports Configure endpoint command Max exit latency too large */
#define HCC2_CMC(p)             ((p) & (1 << 1))
/* true: HC supports Force Save context Capability */
#define HCC2_FSC(p)             ((p) & (1 << 2))
/* true: HC supports Compliance Transition Capability */
#define HCC2_CTC(p)             ((p) & (1 << 3))
/* true: HC support Large ESIT payload Capability > 48k */
#define HCC2_LEC(p)             ((p) & (1 << 4))
/* true: HC support Configuration Information Capability */
#define HCC2_CIC(p)             ((p) & (1 << 5))
/* true: HC support Extended TBC Capability, Isoc burst count > 65535 */
#define HCC2_ETC(p)             ((p) & (1 << 6))

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

#define PORTSC          0
#define PORTPMSC        1
#define PORTLI          2
#define PORTHLPMC       3

/**
 * 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 {
        __le32  command;
        __le32  status;
        __le32  page_size;
        __le32  reserved1;
        __le32  reserved2;
        __le32  dev_notification;
        __le64  cmd_ring;
        /* rsvd: offset 0x20-2F */
        __le32  reserved3[4];
        __le64  dcbaa_ptr;
        __le32  config_reg;
        /* rsvd: offset 0x3C-3FF */
        __le32  reserved4[241];
        /* port 1 registers, which serve as a base address for other ports */
        __le32  port_status_base;
        __le32  port_power_base;
        __le32  port_link_base;
        __le32  reserved5;
        /* registers for ports 2-255 */
        __le32  reserved6[NUM_PORT_REGS*254];
};

/* 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)
/* host controller save/restore state. */
#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)
/* bit 14 Extended TBC Enable, changes Isoc TRB fields to support larger TBC */
#define CMD_ETE         (1 << 14)
/* bits 15:31 are reserved (and should be preserved on writes). */

/* IMAN - Interrupt Management Register */
#define IMAN_IE         (1 << 1)
#define IMAN_IP         (1 << 0)

/* 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)
#define ENABLE_DEV_NOTE(x)      (1 << (x))
/* 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)

/* 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. */
#define CMD_RING_RSVD_BITS      (0x3f)

/* CONFIG - Configure Register - config_reg bitmasks */
/* bits 0:7 - maximum number of device slots enabled (NumSlotsEn) */
#define MAX_DEVS(p)     ((p) & 0xff)
/* bit 8: U3 Entry Enabled, assert PLC when root port enters U3, xhci 1.1 */
#define CONFIG_U3E              (1 << 8)
/* bit 9: Configuration Information Enable, xhci 1.1 */
#define CONFIG_CIE              (1 << 9)
/* bits 10:31 - 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.
 */
#define PORT_PLS_MASK   (0xf << 5)
#define XDEV_U0         (0x0 << 5)
#define XDEV_U1         (0x1 << 5)
#define XDEV_U2         (0x2 << 5)
#define XDEV_U3         (0x3 << 5)
#define XDEV_DISABLED   (0x4 << 5)
#define XDEV_RXDETECT   (0x5 << 5)
#define XDEV_INACTIVE   (0x6 << 5)
#define XDEV_POLLING    (0x7 << 5)
#define XDEV_RECOVERY   (0x8 << 5)
#define XDEV_HOT_RESET  (0x9 << 5)
#define XDEV_COMP_MODE  (0xa << 5)
#define XDEV_TEST_MODE  (0xb << 5)
#define XDEV_RESUME     (0xf << 5)

/* 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
 */
#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)
#define XDEV_SSP                (0x5 << 10)
#define DEV_UNDEFSPEED(p)       (((p) & DEV_SPEED_MASK) == (0x0<<10))
#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)
#define DEV_SUPERSPEEDPLUS(p)   (((p) & DEV_SPEED_MASK) == XDEV_SSP)
#define DEV_SUPERSPEED_ANY(p)   (((p) & DEV_SPEED_MASK) >= XDEV_SS)
#define DEV_PORT_SPEED(p)       (((p) >> 10) & 0x0f)

/* 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)
#define SLOT_SPEED_SSP          (XDEV_SSP << 10)
/* 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)
/* Cold Attach Status - xHC can set this bit to report device attached during
 * Sx state. Warm port reset should be perfomed to clear this bit and move port
 * to connected state.
 */
#define PORT_CAS        (1 << 24)
/* 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 non-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)

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

/* 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)
#define PORT_U1_TIMEOUT_MASK    0xff
/* Inactivity timer value for transitions into U2 */
#define PORT_U2_TIMEOUT(p)      (((p) & 0xff) << 8)
#define PORT_U2_TIMEOUT_MASK    (0xff << 8)
/* Bits 24:31 for port testing */

/* USB2 Protocol PORTSPMSC */
#define PORT_L1S_MASK           7
#define PORT_L1S_SUCCESS        1
#define PORT_RWE                (1 << 3)
#define PORT_HIRD(p)            (((p) & 0xf) << 4)
#define PORT_HIRD_MASK          (0xf << 4)
#define PORT_L1DS_MASK          (0xff << 8)
#define PORT_L1DS(p)            (((p) & 0xff) << 8)
#define PORT_HLE                (1 << 16)
#define PORT_TEST_MODE_SHIFT    28

/* USB3 Protocol PORTLI  Port Link Information */
#define PORT_RX_LANES(p)        (((p) >> 16) & 0xf)
#define PORT_TX_LANES(p)        (((p) >> 20) & 0xf)

/* USB2 Protocol PORTHLPMC */
#define PORT_HIRDM(p)((p) & 3)
#define PORT_L1_TIMEOUT(p)(((p) & 0xff) << 2)
#define PORT_BESLD(p)(((p) & 0xf) << 10)

/* use 512 microseconds as USB2 LPM L1 default timeout. */
#define XHCI_L1_TIMEOUT         512

/* Set default HIRD/BESL value to 4 (350/400us) for USB2 L1 LPM resume latency.
 * Safe to use with mixed HIRD and BESL systems (host and device) and is used
 * by other operating systems.
 *
 * XHCI 1.0 errata 8/14/12 Table 13 notes:
 * "Software should choose xHC BESL/BESLD field values that do not violate a
 * device's resume latency requirements,
 * e.g. not program values > '4' if BLC = '1' and a HIRD device is attached,
 * or not program values < '4' if BLC = '0' and a BESL device is attached.
 */
#define XHCI_DEFAULT_BESL       4

/**
 * struct xhci_intr_reg - Interrupt Register Set
 * @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.
 */
struct xhci_intr_reg {
        __le32  irq_pending;
        __le32  irq_control;
        __le32  erst_size;
        __le32  rsvd;
        __le64  erst_base;
        __le64  erst_dequeue;
};

/* irq_pending bitmasks */
#define ER_IRQ_PENDING(p)       ((p) & 0x1)
/* bits 2:31 need to be preserved */
/* THIS IS BUGGY - FIXME - IP IS WRITE 1 TO CLEAR */
#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 */
/* Preserve bits 16:31 of erst_size */
#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)
#define ERST_PTR_MASK           (0xf)

/**
 * 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 {
        __le32                  microframe_index;
        __le32                  rsvd[7];
        struct xhci_intr_reg    ir_set[128];
};

/**
 * struct doorbell_array
 *
 * Bits  0 -  7: Endpoint target
 * Bits  8 - 15: RsvdZ
 * Bits 16 - 31: Stream ID
 *
 * Section 5.6
 */
struct xhci_doorbell_array {
        __le32  doorbell[256];
};

#define DB_VALUE(ep, stream)    ((((ep) + 1) & 0xff) | ((stream) << 16))
#define DB_VALUE_HOST           0x00000000

/**
 * 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_MINOR(x)  (((x) >> 16) & 0xff)
#define XHCI_EXT_PORT_PSIC(x)   (((x) >> 28) & 0x0f)
#define XHCI_EXT_PORT_OFF(x)    ((x) & 0xff)
#define XHCI_EXT_PORT_COUNT(x)  (((x) >> 8) & 0xff)

#define XHCI_EXT_PORT_PSIV(x)   (((x) >> 0) & 0x0f)
#define XHCI_EXT_PORT_PSIE(x)   (((x) >> 4) & 0x03)
#define XHCI_EXT_PORT_PLT(x)    (((x) >> 6) & 0x03)
#define XHCI_EXT_PORT_PFD(x)    (((x) >> 8) & 0x01)
#define XHCI_EXT_PORT_LP(x)     (((x) >> 14) & 0x03)
#define XHCI_EXT_PORT_PSIM(x)   (((x) >> 16) & 0xffff)

#define PLT_MASK        (0x03 << 6)
#define PLT_SYM         (0x00 << 6)
#define PLT_ASYM_RX     (0x02 << 6)
#define PLT_ASYM_TX     (0x03 << 6)

/**
 * 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;
};

/**
 * 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 {
        __le32  dev_info;
        __le32  dev_info2;
        __le32  tt_info;
        __le32  dev_state;
        /* offset 0x10 to 0x1f reserved for HC internal use */
        __le32  reserved[4];
};

/* 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)
#define GET_DEV_SPEED(n) (((n) & DEV_SPEED) >> 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 */
#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)

/* 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 */
#define ROOT_HUB_PORT(p)        (((p) & 0xff) << 16)
#define DEVINFO_TO_ROOT_HUB_PORT(p)     (((p) >> 16) & 0xff)
/* Maximum number of ports under a hub device */
#define XHCI_MAX_PORTS(p)       (((p) & 0xff) << 24)
#define DEVINFO_TO_MAX_PORTS(p) (((p) & (0xff << 24)) >> 24)

/* 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)
#define TT_THINK_TIME(p)        (((p) & 0x3) << 16)
#define GET_TT_THINK_TIME(p)    (((p) & (0x3 << 16)) >> 16)

/* dev_state bitmasks */
/* USB device address - assigned by the HC */
#define DEV_ADDR_MASK   (0xff)
/* bits 8:26 reserved */
/* Slot state */
#define SLOT_STATE      (0x1f << 27)
#define GET_SLOT_STATE(p)       (((p) & (0x1f << 27)) >> 27)

#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

/**
 * 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.
 * @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).
 *
 * 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 {
        __le32  ep_info;
        __le32  ep_info2;
        __le64  deq;
        __le32  tx_info;
        /* offset 0x14 - 0x1f reserved for HC internal use */
        __le32  reserved[3];
};

/* 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
 */
#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
#define GET_EP_CTX_STATE(ctx)   (le32_to_cpu((ctx)->ep_info) & EP_STATE_MASK)

/* Mult - Max number of burtst within an interval, in EP companion desc. */
#define EP_MULT(p)              (((p) & 0x3) << 8)
#define CTX_TO_EP_MULT(p)       (((p) >> 8) & 0x3)
/* bits 10:14 are Max Primary Streams */
/* bit 15 is Linear Stream Array */
/* Interval - period between requests to an endpoint - 125u increments. */
#define EP_INTERVAL(p)                  (((p) & 0xff) << 16)
#define EP_INTERVAL_TO_UFRAMES(p)       (1 << (((p) >> 16) & 0xff))
#define CTX_TO_EP_INTERVAL(p)           (((p) >> 16) & 0xff)
#define EP_MAXPSTREAMS_MASK             (0x1f << 10)
#define EP_MAXPSTREAMS(p)               (((p) << 10) & EP_MAXPSTREAMS_MASK)
#define CTX_TO_EP_MAXPSTREAMS(p)        (((p) & EP_MAXPSTREAMS_MASK) >> 10)
/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
#define EP_HAS_LSA              (1 << 15)
/* hosts with LEC=1 use bits 31:24 as ESIT high bits. */
#define CTX_TO_MAX_ESIT_PAYLOAD_HI(p)   (((p) >> 24) & 0xff)

/* 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)
#define CTX_TO_EP_TYPE(p)       (((p) >> 3) & 0x7)
#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)
#define CTX_TO_MAX_BURST(p)     (((p) >> 8) & 0xff)
#define MAX_PACKET(p)   (((p)&0xffff) << 16)
#define MAX_PACKET_MASK         (0xffff << 16)
#define MAX_PACKET_DECODED(p)   (((p) >> 16) & 0xffff)

/* tx_info bitmasks */
#define EP_AVG_TRB_LENGTH(p)            ((p) & 0xffff)
#define EP_MAX_ESIT_PAYLOAD_LO(p)       (((p) & 0xffff) << 16)
#define EP_MAX_ESIT_PAYLOAD_HI(p)       ((((p) >> 16) & 0xff) << 24)
#define CTX_TO_MAX_ESIT_PAYLOAD(p)      (((p) >> 16) & 0xffff)

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


/**
 * struct xhci_input_control_context
 * Input control context; see section 6.2.5.
 *
 * @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
 */
struct xhci_input_control_ctx {
        __le32  drop_flags;
        __le32  add_flags;
        __le32  rsvd2[6];
};

#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)))

/* 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;
        int                             slot_id;
        /* 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;
};

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

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

/* Stream Context Types (section 6.4.1) - bits 3:1 of stream ctx deq ptr */
#define SCT_FOR_CTX(p)          (((p) & 0x7) << 1)
/* 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

/* 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 {
        /* ep_interval is zero-based */
        unsigned int            ep_interval;
        /* mult and num_packets are one-based */
        unsigned int            mult;
        unsigned int            num_packets;
        unsigned int            max_packet_size;
        unsigned int            max_esit_payload;
        unsigned int            type;
};

/* "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
#define SS_BW_RESERVED          10

struct xhci_virt_ep {
        struct xhci_ring                *ring;
        /* Related to endpoints that are configured to use stream IDs only */
        struct xhci_stream_info         *stream_info;
        /* 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)
#define EP_HALTED               (1 << 1)        /* For stall handling */
#define EP_STOP_CMD_PENDING     (1 << 2)        /* For URB cancellation */
/* 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)
        /* ----  Related to URB cancellation ---- */
        struct list_head        cancelled_td_list;
        /* Watchdog timer for stop endpoint command to cancel URBs */
        struct timer_list       stop_cmd_timer;
        struct xhci_hcd         *xhci;
        /* 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;
        /*
         * 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;
        /* Bandwidth checking storage */
        struct xhci_bw_info     bw_info;
        struct list_head        bw_endpoint_list;
        /* Isoch Frame ID checking storage */
        int                     next_frame_id;
        /* Use new Isoch TRB layout needed for extended TBC support */
        bool                    use_extended_tbc;
};

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

struct xhci_interval_bw {
        unsigned int            num_packets;
        /* Sorted by max packet size.
         * Head of the list is the greatest max packet size.
         */
        struct list_head        endpoints;
        /* 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];
        /* Includes reserved bandwidth for async endpoints */
        unsigned int            bw_used;
        unsigned int            ss_bw_in;
        unsigned int            ss_bw_out;
};


struct xhci_virt_device {
        struct usb_device               *udev;
        /*
         * 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.
         */
        struct xhci_container_ctx       *out_ctx;
        /* Used for addressing devices and configuration changes */
        struct xhci_container_ctx       *in_ctx;
        struct xhci_virt_ep             eps[31];
        u8                              fake_port;
        u8                              real_port;
        struct xhci_interval_bw_table   *bw_table;
        struct xhci_tt_bw_info          *tt_info;
        /* The current max exit latency for the enabled USB3 link states. */
        u16                             current_mel;
        /* Used for the debugfs interfaces. */
        void                            *debugfs_private;
};

/*
 * 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;
};


/**
 * 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 */
        __le64                  dev_context_ptrs[MAX_HC_SLOTS];
        /* private xHCD pointers */
        dma_addr_t      dma;
};
/* 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.
 */


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

/* Transfer event TRB length bit mask */
/* bits 0:23 */
#define EVENT_TRB_LEN(p)                ((p) & 0xffffff)

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

/* 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_INVALID                            0
#define COMP_SUCCESS                            1
#define COMP_DATA_BUFFER_ERROR                  2
#define COMP_BABBLE_DETECTED_ERROR              3
#define COMP_USB_TRANSACTION_ERROR              4
#define COMP_TRB_ERROR                          5
#define COMP_STALL_ERROR                        6
#define COMP_RESOURCE_ERROR                     7
#define COMP_BANDWIDTH_ERROR                    8
#define COMP_NO_SLOTS_AVAILABLE_ERROR           9
#define COMP_INVALID_STREAM_TYPE_ERROR          10
#define COMP_SLOT_NOT_ENABLED_ERROR             11
#define COMP_ENDPOINT_NOT_ENABLED_ERROR         12
#define COMP_SHORT_PACKET                       13
#define COMP_RING_UNDERRUN                      14
#define COMP_RING_OVERRUN                       15
#define COMP_VF_EVENT_RING_FULL_ERROR           16
#define COMP_PARAMETER_ERROR                    17
#define COMP_BANDWIDTH_OVERRUN_ERROR            18
#define COMP_CONTEXT_STATE_ERROR                19
#define COMP_NO_PING_RESPONSE_ERROR             20
#define COMP_EVENT_RING_FULL_ERROR              21
#define COMP_INCOMPATIBLE_DEVICE_ERROR          22
#define COMP_MISSED_SERVICE_ERROR               23
#define COMP_COMMAND_RING_STOPPED               24
#define COMP_COMMAND_ABORTED                    25
#define COMP_STOPPED                            26
#define COMP_STOPPED_LENGTH_INVALID             27
#define COMP_STOPPED_SHORT_PACKET               28
#define COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR   29
#define COMP_ISOCH_BUFFER_OVERRUN               31
#define COMP_EVENT_LOST_ERROR                   32
#define COMP_UNDEFINED_ERROR                    33
#define COMP_INVALID_STREAM_ID_ERROR            34
#define COMP_SECONDARY_BANDWIDTH_ERROR          35
#define COMP_SPLIT_TRANSACTION_ERROR            36

static inline const char *xhci_trb_comp_code_string(u8 status)
{
        switch (status) {
        case COMP_INVALID:
                return "Invalid";
        case COMP_SUCCESS:
                return "Success";
        case COMP_DATA_BUFFER_ERROR:
                return "Data Buffer Error";
        case COMP_BABBLE_DETECTED_ERROR:
                return "Babble Detected";
        case COMP_USB_TRANSACTION_ERROR:
                return "USB Transaction Error";
        case COMP_TRB_ERROR:
                return "TRB Error";
        case COMP_STALL_ERROR:
                return "Stall Error";
        case COMP_RESOURCE_ERROR:
                return "Resource Error";
        case COMP_BANDWIDTH_ERROR:
                return "Bandwidth Error";
        case COMP_NO_SLOTS_AVAILABLE_ERROR:
                return "No Slots Available Error";
        case COMP_INVALID_STREAM_TYPE_ERROR:
                return "Invalid Stream Type Error";
        case COMP_SLOT_NOT_ENABLED_ERROR:
                return "Slot Not Enabled Error";
        case COMP_ENDPOINT_NOT_ENABLED_ERROR:
                return "Endpoint Not Enabled Error";
        case COMP_SHORT_PACKET:
                return "Short Packet";
        case COMP_RING_UNDERRUN:
                return "Ring Underrun";
        case COMP_RING_OVERRUN:
                return "Ring Overrun";
        case COMP_VF_EVENT_RING_FULL_ERROR:
                return "VF Event Ring Full Error";
        case COMP_PARAMETER_ERROR:
                return "Parameter Error";
        case COMP_BANDWIDTH_OVERRUN_ERROR:
                return "Bandwidth Overrun Error";
        case COMP_CONTEXT_STATE_ERROR:
                return "Context State Error";
        case COMP_NO_PING_RESPONSE_ERROR:
                return "No Ping Response Error";
        case COMP_EVENT_RING_FULL_ERROR:
                return "Event Ring Full Error";
        case COMP_INCOMPATIBLE_DEVICE_ERROR:
                return "Incompatible Device Error";
        case COMP_MISSED_SERVICE_ERROR:
                return "Missed Service Error";
        case COMP_COMMAND_RING_STOPPED:
                return "Command Ring Stopped";
        case COMP_COMMAND_ABORTED:
                return "Command Aborted";
        case COMP_STOPPED:
                return "Stopped";
        case COMP_STOPPED_LENGTH_INVALID:
                return "Stopped - Length Invalid";
        case COMP_STOPPED_SHORT_PACKET:
                return "Stopped - Short Packet";
        case COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR:
                return "Max Exit Latency Too Large Error";
        case COMP_ISOCH_BUFFER_OVERRUN:
                return "Isoch Buffer Overrun";
        case COMP_EVENT_LOST_ERROR:
                return "Event Lost Error";
        case COMP_UNDEFINED_ERROR:
                return "Undefined Error";
        case COMP_INVALID_STREAM_ID_ERROR:
                return "Invalid Stream ID Error";
        case COMP_SECONDARY_BANDWIDTH_ERROR:
                return "Secondary Bandwidth Error";
        case COMP_SPLIT_TRANSACTION_ERROR:
                return "Split Transaction Error";
        default:
                return "Unknown!!";
        }
}

struct xhci_link_trb {
        /* 64-bit segment pointer*/
        __le64 segment_ptr;
        __le32 intr_target;
        __le32 control;
};

/* control bitfields */
#define LINK_TOGGLE     (0x1<<1)

/* Command completion event TRB */
struct xhci_event_cmd {
        /* Pointer to command TRB, or the value passed by the event data trb */
        __le64 cmd_trb;
        __le32 status;
        __le32 flags;
};

/* flags bitmasks */

/* Address device - disable SetAddress */
#define TRB_BSR         (1<<9)

/* Configure Endpoint - Deconfigure */
#define TRB_DC          (1<<9)

/* Stop Ring - Transfer State Preserve */
#define TRB_TSP         (1<<9)

enum xhci_ep_reset_type {
        EP_HARD_RESET,
        EP_SOFT_RESET,
};

/* Force Event */
#define TRB_TO_VF_INTR_TARGET(p)        (((p) & (0x3ff << 22)) >> 22)
#define TRB_TO_VF_ID(p)                 (((p) & (0xff << 16)) >> 16)

/* Set Latency Tolerance Value */
#define TRB_TO_BELT(p)                  (((p) & (0xfff << 16)) >> 16)

/* Get Port Bandwidth */
#define TRB_TO_DEV_SPEED(p)             (((p) & (0xf << 16)) >> 16)

/* Force Header */
#define TRB_TO_PACKET_TYPE(p)           ((p) & 0x1f)
#define TRB_TO_ROOTHUB_PORT(p)          (((p) & (0xff << 24)) >> 24)

enum xhci_setup_dev {
        SETUP_CONTEXT_ONLY,
        SETUP_CONTEXT_ADDRESS,
};

/* 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)

/* 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)

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

/* Set TR Dequeue Pointer command TRB fields, 6.4.3.9 */
#define TRB_TO_STREAM_ID(p)             ((((p) & (0xffff << 16)) >> 16))
#define STREAM_ID_FOR_TRB(p)            ((((p)) & 0xffff) << 16)
#define SCT_FOR_TRB(p)                  (((p) << 1) & 0x7)

/* Link TRB specific fields */
#define TRB_TC                  (1<<1)

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

#define EVENT_DATA              (1 << 2)

/* Normal TRB fields */
/* transfer_len bitmasks - bits 0:16 */
#define TRB_LEN(p)              ((p) & 0x1ffff)
/* TD Size, packets remaining in this TD, bits 21:17 (5 bits, so max 31) */
#define TRB_TD_SIZE(p)          (min((p), (u32)31) << 17)
#define GET_TD_SIZE(p)          (((p) & 0x3e0000) >> 17)
/* xhci 1.1 uses the TD_SIZE field for TBC if Extended TBC is enabled (ETE) */
#define TRB_TD_SIZE_TBC(p)      (min((p), (u32)31) << 17)
/* 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)
/* Total burst count field, Rsvdz on xhci 1.1 with Extended TBC enabled (ETE) */
#define TRB_TBC(p)              (((p) & 0x3) << 7)
#define TRB_TLBPC(p)            (((p) & 0xf) << 16)

/* 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)

/* Block Event Interrupt */
#define TRB_BEI                 (1<<9)

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

/* Isochronous TRB specific fields */
#define TRB_SIA                 (1<<31)
#define TRB_FRAME_ID(p)         (((p) & 0x7ff) << 20)

struct xhci_generic_trb {
        __le32 field[4];
};

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;
};

/* TRB bit mask */
#define TRB_TYPE_BITMASK        (0xfc00)
#define TRB_TYPE(p)             ((p) << 10)
#define TRB_FIELD_TO_TYPE(p)    (((p) & TRB_TYPE_BITMASK) >> 10)
/* 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
/* Reset Endpoint Command */
#define TRB_RESET_EP            14
/* 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 */

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

static inline const char *xhci_trb_type_string(u8 type)
{
        switch (type) {
        case TRB_NORMAL:
                return "Normal";
        case TRB_SETUP:
                return "Setup Stage";
        case TRB_DATA:
                return "Data Stage";
        case TRB_STATUS:
                return "Status Stage";
        case TRB_ISOC:
                return "Isoch";
        case TRB_LINK:
                return "Link";
        case TRB_EVENT_DATA:
                return "Event Data";
        case TRB_TR_NOOP:
                return "No-Op";
        case TRB_ENABLE_SLOT:
                return "Enable Slot Command";
        case TRB_DISABLE_SLOT:
                return "Disable Slot Command";
        case TRB_ADDR_DEV:
                return "Address Device Command";
        case TRB_CONFIG_EP:
                return "Configure Endpoint Command";
        case TRB_EVAL_CONTEXT:
                return "Evaluate Context Command";
        case TRB_RESET_EP:
                return "Reset Endpoint Command";
        case TRB_STOP_RING:
                return "Stop Ring Command";
        case TRB_SET_DEQ:
                return "Set TR Dequeue Pointer Command";
        case TRB_RESET_DEV:
                return "Reset Device Command";
        case TRB_FORCE_EVENT:
                return "Force Event Command";
        case TRB_NEG_BANDWIDTH:
                return "Negotiate Bandwidth Command";
        case TRB_SET_LT:
                return "Set Latency Tolerance Value Command";
        case TRB_GET_BW:
                return "Get Port Bandwidth Command";
        case TRB_FORCE_HEADER:
                return "Force Header Command";
        case TRB_CMD_NOOP:
                return "No-Op Command";
        case TRB_TRANSFER:
                return "Transfer Event";
        case TRB_COMPLETION:
                return "Command Completion Event";
        case TRB_PORT_STATUS:
                return "Port Status Change Event";
        case TRB_BANDWIDTH_EVENT:
                return "Bandwidth Request Event";
        case TRB_DOORBELL:
                return "Doorbell Event";
        case TRB_HC_EVENT:
                return "Host Controller Event";
        case TRB_DEV_NOTE:
                return "Device Notification Event";
        case TRB_MFINDEX_WRAP:
                return "MFINDEX Wrap Event";
        case TRB_NEC_CMD_COMP:
                return "NEC Command Completion Event";
        case TRB_NEC_GET_FW:
                return "NET Get Firmware Revision Command";
        default:
                return "UNKNOWN";
        }
}

#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)))

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

/*
 * 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        256
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS       (TRBS_PER_SEGMENT - 3)
#define TRB_SEGMENT_SIZE        (TRBS_PER_SEGMENT*16)
#define TRB_SEGMENT_SHIFT       (ilog2(TRB_SEGMENT_SIZE))
/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT              16
#define TRB_MAX_BUFF_SIZE       (1 << TRB_MAX_BUFF_SHIFT)
/* How much data is left before the 64KB boundary? */
#define TRB_BUFF_LEN_UP_TO_BOUNDARY(addr)       (TRB_MAX_BUFF_SIZE - \
                                        (addr & (TRB_MAX_BUFF_SIZE - 1)))

struct xhci_segment {
        union xhci_trb          *trbs;
        /* private to HCD */
        struct xhci_segment     *next;
        dma_addr_t              dma;
        /* Max packet sized bounce buffer for td-fragmant alignment */
        dma_addr_t              bounce_dma;
        void                    *bounce_buf;
        unsigned int            bounce_offs;
        unsigned int            bounce_len;
};

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;
        struct xhci_segment     *bounce_seg;
        /* actual_length of the URB has already been set */
        bool                    urb_length_set;
};

/* xHCI command default timeout value */
#define XHCI_CMD_DEFAULT_TIMEOUT        (5 * HZ)

/* command descriptor */
struct xhci_cd {
        struct xhci_command     *command;
        union xhci_trb          *cmd_trb;
};

struct xhci_dequeue_state {
        struct xhci_segment *new_deq_seg;
        union xhci_trb *new_deq_ptr;
        int new_cycle_state;
        unsigned int stream_id;
};

enum xhci_ring_type {
        TYPE_CTRL = 0,
        TYPE_ISOC,
        TYPE_BULK,
        TYPE_INTR,
        TYPE_STREAM,
        TYPE_COMMAND,
        TYPE_EVENT,
};

static inline const char *xhci_ring_type_string(enum xhci_ring_type type)
{
        switch (type) {
        case TYPE_CTRL:
                return "CTRL";
        case TYPE_ISOC:
                return "ISOC";
        case TYPE_BULK:
                return "BULK";
        case TYPE_INTR:
                return "INTR";
        case TYPE_STREAM:
                return "STREAM";
        case TYPE_COMMAND:
                return "CMD";
        case TYPE_EVENT:
                return "EVENT";
        }

        return "UNKNOWN";
}

struct xhci_ring {
        struct xhci_segment     *first_seg;
        struct xhci_segment     *last_seg;
        union  xhci_trb         *enqueue;
        struct xhci_segment     *enq_seg;
        union  xhci_trb         *dequeue;
        struct xhci_segment     *deq_seg;
        struct list_head        td_list;
        /*
         * 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;
        unsigned int            stream_id;
        unsigned int            num_segs;
        unsigned int            num_trbs_free;
        unsigned int            num_trbs_free_temp;
        unsigned int            bounce_buf_len;
        enum xhci_ring_type     type;
        bool                    last_td_was_short;
        struct radix_tree_root  *trb_address_map;
};

struct xhci_erst_entry {
        /* 64-bit event ring segment address */
        __le64  seg_addr;
        __le32  seg_size;
        /* Set to zero */
        __le32  rsvd;
};

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;
};

struct xhci_scratchpad {
        u64 *sp_array;
        dma_addr_t sp_dma;
        void **sp_buffers;
};

struct urb_priv {
        int     num_tds;
        int     num_tds_done;
        struct  xhci_td td[0];
};

/*
 * 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
/* Poll every 60 seconds */
#define POLL_TIMEOUT    60
/* Stop endpoint command timeout (secs) for URB cancellation watchdog timer */
#define XHCI_STOP_EP_CMD_TIMEOUT        5
/* XXX: Make these module parameters */

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;
};

/* Use for lpm */
struct dev_info {
        u32                     dev_id;
        struct  list_head       list;
};

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;
        u32                     port_remote_wakeup;
        unsigned long           resume_done[USB_MAXCHILDREN];
        /* which ports have started to resume */
        unsigned long           resuming_ports;
        /* Which ports are waiting on RExit to U0 transition. */
        unsigned long           rexit_ports;
        struct completion       rexit_done[USB_MAXCHILDREN];
};


/*
 * It can take up to 20 ms to transition from RExit to U0 on the
 * Intel Lynx Point LP xHCI host.
 */
#define XHCI_MAX_REXIT_TIMEOUT  (20 * 1000)

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

struct xhci_hub {
        u8      maj_rev;
        u8      min_rev;
        u32     *psi;           /* array of protocol speed ID entries */
        u8      psi_count;
        u8      psi_uid_count;
};

/* There is one xhci_hcd structure per controller */
struct xhci_hcd {
        struct usb_hcd *main_hcd;
        struct usb_hcd *shared_hcd;
        /* 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;
        struct xhci_doorbell_array __iomem *dba;
        /* Our HCD's current interrupter register set */
        struct  xhci_intr_reg __iomem *ir_set;

        /* Cached register copies of read-only HC data */
        __u32           hcs_params1;
        __u32           hcs_params2;
        __u32           hcs_params3;
        __u32           hcc_params;
        __u32           hcc_params2;

        spinlock_t      lock;

        /* packed release number */
        u8              sbrn;
        u16             hci_version;
        u8              max_slots;
        u8              max_interrupters;
        u8              max_ports;
        u8              isoc_threshold;
        /* imod_interval in ns (I * 250ns) */
        u32             imod_interval;
        int             event_ring_max;
        /* 4KB min, 128MB max */
        int             page_size;
        /* Valid values are 12 to 20, inclusive */
        int             page_shift;
        /* msi-x vectors */
        int             msix_count;
        /* optional clock */
        struct clk              *clk;
        /* data structures */
        struct xhci_device_context_array *dcbaa;
        struct xhci_ring        *cmd_ring;
        unsigned int            cmd_ring_state;
#define CMD_RING_STATE_RUNNING         (1 << 0)
#define CMD_RING_STATE_ABORTED         (1 << 1)
#define CMD_RING_STATE_STOPPED         (1 << 2)
        struct list_head        cmd_list;
        unsigned int            cmd_ring_reserved_trbs;
        struct delayed_work     cmd_timer;
        struct completion       cmd_ring_stop_completion;
        struct xhci_command     *current_cmd;
        struct xhci_ring        *event_ring;
        struct xhci_erst        erst;
        /* Scratchpad */
        struct xhci_scratchpad  *scratchpad;
        /* Store LPM test failed devices' information */
        struct list_head        lpm_failed_devs;

        /* slot enabling and address device helpers */
        /* these are not thread safe so use mutex */
        struct mutex mutex;
        /* For USB 3.0 LPM enable/disable. */
        struct xhci_command             *lpm_command;
        /* Internal mirror of the HW's dcbaa */
        struct xhci_virt_device *devs[MAX_HC_SLOTS];
        /* For keeping track of bandwidth domains per roothub. */
        struct xhci_root_port_bw_info   *rh_bw;

        /* DMA pools */
        struct dma_pool *device_pool;
        struct dma_pool *segment_pool;
        struct dma_pool *small_streams_pool;
        struct dma_pool *medium_streams_pool;

        /* Host controller watchdog timer structures */
        unsigned int            xhc_state;

        u32                     command;
        struct s3_save          s3;
/* 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)
#define XHCI_STATE_HALTED       (1 << 1)
#define XHCI_STATE_REMOVING     (1 << 2)
        unsigned int            quirks;
#define XHCI_LINK_TRB_QUIRK     (1 << 0)
#define XHCI_RESET_EP_QUIRK     (1 << 1)
#define XHCI_NEC_HOST           (1 << 2)
#define XHCI_AMD_PLL_FIX        (1 << 3)
#define XHCI_SPURIOUS_SUCCESS   (1 << 4)
/*
 * 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)
#define XHCI_BROKEN_MSI         (1 << 6)
#define XHCI_RESET_ON_RESUME    (1 << 7)
#define XHCI_SW_BW_CHECKING     (1 << 8)
#define XHCI_AMD_0x96_HOST      (1 << 9)
#define XHCI_TRUST_TX_LENGTH    (1 << 10)
#define XHCI_LPM_SUPPORT        (1 << 11)
#define XHCI_INTEL_HOST         (1 << 12)
#define XHCI_SPURIOUS_REBOOT    (1 << 13)
#define XHCI_COMP_MODE_QUIRK    (1 << 14)
#define XHCI_AVOID_BEI          (1 << 15)
#define XHCI_PLAT               (1 << 16)
#define XHCI_SLOW_SUSPEND       (1 << 17)
#define XHCI_SPURIOUS_WAKEUP    (1 << 18)
/* For controllers with a broken beyond repair streams implementation */
#define XHCI_BROKEN_STREAMS     (1 << 19)
#define XHCI_PME_STUCK_QUIRK    (1 << 20)
#define XHCI_MTK_HOST           (1 << 21)
#define XHCI_SSIC_PORT_UNUSED   (1 << 22)
#define XHCI_NO_64BIT_SUPPORT   (1 << 23)
#define XHCI_MISSING_CAS        (1 << 24)
/* For controller with a broken Port Disable implementation */
#define XHCI_BROKEN_PORT_PED    (1 << 25)
#define XHCI_LIMIT_ENDPOINT_INTERVAL_7  (1 << 26)
#define XHCI_U2_DISABLE_WAKE    (1 << 27)
#define XHCI_ASMEDIA_MODIFY_FLOWCONTROL (1 << 28)
#define XHCI_HW_LPM_DISABLE     (1 << 29)
#define XHCI_SUSPEND_DELAY      (1 << 30)

        unsigned int            num_active_eps;
        unsigned int            limit_active_eps;
        /* There are two roothubs to keep track of bus suspend info for */
        struct xhci_bus_state   bus_state[2];
        /* 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 */
        __le32 __iomem          **usb3_ports;
        unsigned int            num_usb3_ports;
        /* Array of pointers to USB 2.0 PORTSC registers */
        __le32 __iomem          **usb2_ports;
        struct xhci_hub         usb2_rhub;
        struct xhci_hub         usb3_rhub;
        unsigned int            num_usb2_ports;
        /* support xHCI 0.96 spec USB2 software LPM */
        unsigned                sw_lpm_support:1;
        /* support xHCI 1.0 spec USB2 hardware LPM */
        unsigned                hw_lpm_support:1;
        /* cached usb2 extened protocol capabilites */
        u32                     *ext_caps;
        unsigned int            num_ext_caps;
        /* Compliance Mode Recovery Data */
        struct timer_list       comp_mode_recovery_timer;
        u32                     port_status_u0;
        u16                     test_mode;
/* Compliance Mode Timer Triggered every 2 seconds */
#define COMP_MODE_RCVRY_MSECS 2000

        struct dentry           *debugfs_root;
        struct dentry           *debugfs_slots;
        struct list_head        regset_list;

        void                    *dbc;
        /* platform-specific data -- must come last */
        unsigned long           priv[0] __aligned(sizeof(s64));
};

/* Platform specific overrides to generic XHCI hc_driver ops */
struct xhci_driver_overrides {
        size_t extra_priv_size;
        int (*reset)(struct usb_hcd *hcd);
        int (*start)(struct usb_hcd *hcd);
};

#define XHCI_CFC_DELAY          10

/* convert between an HCD pointer and the corresponding EHCI_HCD */
static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
{
        struct usb_hcd *primary_hcd;

        if (usb_hcd_is_primary_hcd(hcd))
                primary_hcd = hcd;
        else
                primary_hcd = hcd->primary_hcd;

        return (struct xhci_hcd *) (primary_hcd->hcd_priv);
}

static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
{
        return xhci->main_hcd;
}

#define xhci_dbg(xhci, fmt, args...) \
        dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#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)
#define xhci_warn_ratelimited(xhci, fmt, args...) \
        dev_warn_ratelimited(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_info(xhci, fmt, args...) \
        dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args)

/*
 * 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,
                __le64 __iomem *regs)
{
        return lo_hi_readq(regs);
}
static inline void xhci_write_64(struct xhci_hcd *xhci,
                                 const u64 val, __le64 __iomem *regs)
{
        lo_hi_writeq(val, regs);
}

static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci)
{
        return xhci->quirks & XHCI_LINK_TRB_QUIRK;
}

/* xHCI debugging */
char *xhci_get_slot_state(struct xhci_hcd *xhci,
                struct xhci_container_ctx *ctx);
void xhci_dbg_trace(struct xhci_hcd *xhci, void (*trace)(struct va_format *),
                        const char *fmt, ...);

/* xHCI memory management */
void xhci_mem_cleanup(struct xhci_hcd *xhci);
int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
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);
void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
                struct usb_device *udev);
unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc);
unsigned int xhci_get_endpoint_address(unsigned int ep_index);
unsigned int xhci_last_valid_endpoint(u32 added_ctxs);
void xhci_endpoint_zero(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_host_endpoint *ep);
void xhci_update_tt_active_eps(struct xhci_hcd *xhci,
                struct xhci_virt_device *virt_dev,
                int old_active_eps);
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);
void xhci_endpoint_copy(struct xhci_hcd *xhci,
                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);
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);
struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
                unsigned int num_segs, unsigned int cycle_state,
                enum xhci_ring_type type, unsigned int max_packet, gfp_t flags);
void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring);
int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
                unsigned int num_trbs, gfp_t flags);
int xhci_alloc_erst(struct xhci_hcd *xhci,
                struct xhci_ring *evt_ring,
                struct xhci_erst *erst,
                gfp_t flags);
void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
void xhci_free_endpoint_ring(struct xhci_hcd *xhci,
                struct xhci_virt_device *virt_dev,
                unsigned int ep_index);
struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
                unsigned int num_stream_ctxs,
                unsigned int num_streams,
                unsigned int max_packet, 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_ep_ctx *ep_ctx,
                struct xhci_virt_ep *ep);
void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
        struct xhci_virt_device *virt_dev, bool drop_control_ep);
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);
struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
                bool allocate_completion, gfp_t mem_flags);
struct xhci_command *xhci_alloc_command_with_ctx(struct xhci_hcd *xhci,
                bool allocate_completion, gfp_t mem_flags);
void xhci_urb_free_priv(struct urb_priv *urb_priv);
void xhci_free_command(struct xhci_hcd *xhci,
                struct xhci_command *command);
struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci,
                int type, gfp_t flags);
void xhci_free_container_ctx(struct xhci_hcd *xhci,
                struct xhci_container_ctx *ctx);

/* xHCI host controller glue */
typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec);
void xhci_quiesce(struct xhci_hcd *xhci);
int xhci_halt(struct xhci_hcd *xhci);
int xhci_start(struct xhci_hcd *xhci);
int xhci_reset(struct xhci_hcd *xhci);
int xhci_run(struct usb_hcd *hcd);
int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
void xhci_init_driver(struct hc_driver *drv,
                      const struct xhci_driver_overrides *over);
int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id);

int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup);
int xhci_resume(struct xhci_hcd *xhci, bool hibernated);

irqreturn_t xhci_irq(struct usb_hcd *hcd);
irqreturn_t xhci_msi_irq(int irq, void *hcd);
int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
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);

/* xHCI ring, segment, TRB, and TD functions */
dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
struct xhci_segment *trb_in_td(struct xhci_hcd *xhci,
                struct xhci_segment *start_seg, union xhci_trb *start_trb,
                union xhci_trb *end_trb, dma_addr_t suspect_dma, bool debug);
int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code);
void xhci_ring_cmd_db(struct xhci_hcd *xhci);
int xhci_queue_slot_control(struct xhci_hcd *xhci, struct xhci_command *cmd,
                u32 trb_type, u32 slot_id);
int xhci_queue_address_device(struct xhci_hcd *xhci, struct xhci_command *cmd,
                dma_addr_t in_ctx_ptr, u32 slot_id, enum xhci_setup_dev);
int xhci_queue_vendor_command(struct xhci_hcd *xhci, struct xhci_command *cmd,
                u32 field1, u32 field2, u32 field3, u32 field4);
int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd,
                int slot_id, unsigned int ep_index, int suspend);
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);
int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
                int slot_id, unsigned int ep_index);
int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags,
                struct urb *urb, int slot_id, unsigned int ep_index);
int xhci_queue_configure_endpoint(struct xhci_hcd *xhci,
                struct xhci_command *cmd, dma_addr_t in_ctx_ptr, u32 slot_id,
                bool command_must_succeed);
int xhci_queue_evaluate_context(struct xhci_hcd *xhci, struct xhci_command *cmd,
                dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed);
int xhci_queue_reset_ep(struct xhci_hcd *xhci, struct xhci_command *cmd,
                int slot_id, unsigned int ep_index,
                enum xhci_ep_reset_type reset_type);
int xhci_queue_reset_device(struct xhci_hcd *xhci, struct xhci_command *cmd,
                u32 slot_id);
void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
                unsigned int slot_id, unsigned int ep_index,
                unsigned int stream_id, struct xhci_td *cur_td,
                struct xhci_dequeue_state *state);
void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
                unsigned int slot_id, unsigned int ep_index,
                struct xhci_dequeue_state *deq_state);
void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci, unsigned int ep_index,
                unsigned int stream_id, struct xhci_td *td);
void xhci_stop_endpoint_command_watchdog(struct timer_list *t);
void xhci_handle_command_timeout(struct work_struct *work);

void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
                unsigned int ep_index, unsigned int stream_id);
void xhci_cleanup_command_queue(struct xhci_hcd *xhci);
void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring);
unsigned int count_trbs(u64 addr, u64 len);

/* xHCI roothub code */
void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
                                int port_id, u32 link_state);
void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
                                int port_id, u32 port_bit);
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);
int xhci_find_raw_port_number(struct usb_hcd *hcd, int port1);
void xhci_hc_died(struct xhci_hcd *xhci);

#ifdef CONFIG_PM
int xhci_bus_suspend(struct usb_hcd *hcd);
int xhci_bus_resume(struct usb_hcd *hcd);
#else
#define xhci_bus_suspend        NULL
#define xhci_bus_resume         NULL
#endif  /* CONFIG_PM */

u32 xhci_port_state_to_neutral(u32 state);
int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
                u16 port);
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);

/* xHCI contexts */
struct xhci_input_control_ctx *xhci_get_input_control_ctx(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);

struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci,
                unsigned int slot_id, unsigned int ep_index,
                unsigned int stream_id);

static inline struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
                                                                struct urb *urb)
{
        return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id,
                                        xhci_get_endpoint_index(&urb->ep->desc),
                                        urb->stream_id);
}

static inline char *xhci_slot_state_string(u32 state)
{
        switch (state) {
        case SLOT_STATE_ENABLED:
                return "enabled/disabled";
        case SLOT_STATE_DEFAULT:
                return "default";
        case SLOT_STATE_ADDRESSED:
                return "addressed";
        case SLOT_STATE_CONFIGURED:
                return "configured";
        default:
                return "reserved";
        }
}

static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
                u32 field3)
{
        static char str[256];
        int type = TRB_FIELD_TO_TYPE(field3);

        switch (type) {
        case TRB_LINK:
                sprintf(str,
                        "LINK %08x%08x intr %d type '%s' flags %c:%c:%c:%c",
                        field1, field0, GET_INTR_TARGET(field2),
                        xhci_trb_type_string(type),
                        field3 & TRB_IOC ? 'I' : 'i',
                        field3 & TRB_CHAIN ? 'C' : 'c',
                        field3 & TRB_TC ? 'T' : 't',
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_TRANSFER:
        case TRB_COMPLETION:
        case TRB_PORT_STATUS:
        case TRB_BANDWIDTH_EVENT:
        case TRB_DOORBELL:
        case TRB_HC_EVENT:
        case TRB_DEV_NOTE:
        case TRB_MFINDEX_WRAP:
                sprintf(str,
                        "TRB %08x%08x status '%s' len %d slot %d ep %d type '%s' flags %c:%c",
                        field1, field0,
                        xhci_trb_comp_code_string(GET_COMP_CODE(field2)),
                        EVENT_TRB_LEN(field2), TRB_TO_SLOT_ID(field3),
                        /* Macro decrements 1, maybe it shouldn't?!? */
                        TRB_TO_EP_INDEX(field3) + 1,
                        xhci_trb_type_string(type),
                        field3 & EVENT_DATA ? 'E' : 'e',
                        field3 & TRB_CYCLE ? 'C' : 'c');

                break;
        case TRB_SETUP:
                sprintf(str, "bRequestType %02x bRequest %02x wValue %02x%02x wIndex %02x%02x wLength %d length %d TD size %d intr %d type '%s' flags %c:%c:%c",
                                field0 & 0xff,
                                (field0 & 0xff00) >> 8,
                                (field0 & 0xff000000) >> 24,
                                (field0 & 0xff0000) >> 16,
                                (field1 & 0xff00) >> 8,
                                field1 & 0xff,
                                (field1 & 0xff000000) >> 16 |
                                (field1 & 0xff0000) >> 16,
                                TRB_LEN(field2), GET_TD_SIZE(field2),
                                GET_INTR_TARGET(field2),
                                xhci_trb_type_string(type),
                                field3 & TRB_IDT ? 'I' : 'i',
                                field3 & TRB_IOC ? 'I' : 'i',
                                field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_DATA:
                sprintf(str, "Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c:%c:%c:%c",
                                field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
                                GET_INTR_TARGET(field2),
                                xhci_trb_type_string(type),
                                field3 & TRB_IDT ? 'I' : 'i',
                                field3 & TRB_IOC ? 'I' : 'i',
                                field3 & TRB_CHAIN ? 'C' : 'c',
                                field3 & TRB_NO_SNOOP ? 'S' : 's',
                                field3 & TRB_ISP ? 'I' : 'i',
                                field3 & TRB_ENT ? 'E' : 'e',
                                field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_STATUS:
                sprintf(str, "Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c",
                                field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
                                GET_INTR_TARGET(field2),
                                xhci_trb_type_string(type),
                                field3 & TRB_IOC ? 'I' : 'i',
                                field3 & TRB_CHAIN ? 'C' : 'c',
                                field3 & TRB_ENT ? 'E' : 'e',
                                field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_NORMAL:
        case TRB_ISOC:
        case TRB_EVENT_DATA:
        case TRB_TR_NOOP:
                sprintf(str,
                        "Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c:%c:%c:%c:%c",
                        field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
                        GET_INTR_TARGET(field2),
                        xhci_trb_type_string(type),
                        field3 & TRB_BEI ? 'B' : 'b',
                        field3 & TRB_IDT ? 'I' : 'i',
                        field3 & TRB_IOC ? 'I' : 'i',
                        field3 & TRB_CHAIN ? 'C' : 'c',
                        field3 & TRB_NO_SNOOP ? 'S' : 's',
                        field3 & TRB_ISP ? 'I' : 'i',
                        field3 & TRB_ENT ? 'E' : 'e',
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;

        case TRB_CMD_NOOP:
        case TRB_ENABLE_SLOT:
                sprintf(str,
                        "%s: flags %c",
                        xhci_trb_type_string(type),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_DISABLE_SLOT:
        case TRB_NEG_BANDWIDTH:
                sprintf(str,
                        "%s: slot %d flags %c",
                        xhci_trb_type_string(type),
                        TRB_TO_SLOT_ID(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_ADDR_DEV:
                sprintf(str,
                        "%s: ctx %08x%08x slot %d flags %c:%c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_SLOT_ID(field3),
                        field3 & TRB_BSR ? 'B' : 'b',
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_CONFIG_EP:
                sprintf(str,
                        "%s: ctx %08x%08x slot %d flags %c:%c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_SLOT_ID(field3),
                        field3 & TRB_DC ? 'D' : 'd',
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_EVAL_CONTEXT:
                sprintf(str,
                        "%s: ctx %08x%08x slot %d flags %c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_SLOT_ID(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_RESET_EP:
                sprintf(str,
                        "%s: ctx %08x%08x slot %d ep %d flags %c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_SLOT_ID(field3),
                        /* Macro decrements 1, maybe it shouldn't?!? */
                        TRB_TO_EP_INDEX(field3) + 1,
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_STOP_RING:
                sprintf(str,
                        "%s: slot %d sp %d ep %d flags %c",
                        xhci_trb_type_string(type),
                        TRB_TO_SLOT_ID(field3),
                        TRB_TO_SUSPEND_PORT(field3),
                        /* Macro decrements 1, maybe it shouldn't?!? */
                        TRB_TO_EP_INDEX(field3) + 1,
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_SET_DEQ:
                sprintf(str,
                        "%s: deq %08x%08x stream %d slot %d ep %d flags %c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_STREAM_ID(field2),
                        TRB_TO_SLOT_ID(field3),
                        /* Macro decrements 1, maybe it shouldn't?!? */
                        TRB_TO_EP_INDEX(field3) + 1,
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_RESET_DEV:
                sprintf(str,
                        "%s: slot %d flags %c",
                        xhci_trb_type_string(type),
                        TRB_TO_SLOT_ID(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_FORCE_EVENT:
                sprintf(str,
                        "%s: event %08x%08x vf intr %d vf id %d flags %c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_VF_INTR_TARGET(field2),
                        TRB_TO_VF_ID(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_SET_LT:
                sprintf(str,
                        "%s: belt %d flags %c",
                        xhci_trb_type_string(type),
                        TRB_TO_BELT(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_GET_BW:
                sprintf(str,
                        "%s: ctx %08x%08x slot %d speed %d flags %c",
                        xhci_trb_type_string(type),
                        field1, field0,
                        TRB_TO_SLOT_ID(field3),
                        TRB_TO_DEV_SPEED(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        case TRB_FORCE_HEADER:
                sprintf(str,
                        "%s: info %08x%08x%08x pkt type %d roothub port %d flags %c",
                        xhci_trb_type_string(type),
                        field2, field1, field0 & 0xffffffe0,
                        TRB_TO_PACKET_TYPE(field0),
                        TRB_TO_ROOTHUB_PORT(field3),
                        field3 & TRB_CYCLE ? 'C' : 'c');
                break;
        default:
                sprintf(str,
                        "type '%s' -> raw %08x %08x %08x %08x",
                        xhci_trb_type_string(type),
                        field0, field1, field2, field3);
        }

        return str;
}

static inline const char *xhci_decode_slot_context(u32 info, u32 info2,
                u32 tt_info, u32 state)
{
        static char str[1024];
        u32 speed;
        u32 hub;
        u32 mtt;
        int ret = 0;

        speed = info & DEV_SPEED;
        hub = info & DEV_HUB;
        mtt = info & DEV_MTT;

        ret = sprintf(str, "RS %05x %s%s%s Ctx Entries %d MEL %d us Port# %d/%d",
                        info & ROUTE_STRING_MASK,
                        ({ char *s;
                        switch (speed) {
                        case SLOT_SPEED_FS:
                                s = "full-speed";
                                break;
                        case SLOT_SPEED_LS:
                                s = "low-speed";
                                break;
                        case SLOT_SPEED_HS:
                                s = "high-speed";
                                break;
                        case SLOT_SPEED_SS:
                                s = "super-speed";
                                break;
                        case SLOT_SPEED_SSP:
                                s = "super-speed plus";
                                break;
                        default:
                                s = "UNKNOWN speed";
                        } s; }),
                        mtt ? " multi-TT" : "",
                        hub ? " Hub" : "",
                        (info & LAST_CTX_MASK) >> 27,
                        info2 & MAX_EXIT,
                        DEVINFO_TO_ROOT_HUB_PORT(info2),
                        DEVINFO_TO_MAX_PORTS(info2));

        ret += sprintf(str + ret, " [TT Slot %d Port# %d TTT %d Intr %d] Addr %d State %s",
                        tt_info & TT_SLOT, (tt_info & TT_PORT) >> 8,
                        GET_TT_THINK_TIME(tt_info), GET_INTR_TARGET(tt_info),
                        state & DEV_ADDR_MASK,
                        xhci_slot_state_string(GET_SLOT_STATE(state)));

        return str;
}


static inline const char *xhci_portsc_link_state_string(u32 portsc)
{
        switch (portsc & PORT_PLS_MASK) {
        case XDEV_U0:
                return "U0";
        case XDEV_U1:
                return "U1";
        case XDEV_U2:
                return "U2";
        case XDEV_U3:
                return "U3";
        case XDEV_DISABLED:
                return "Disabled";
        case XDEV_RXDETECT:
                return "RxDetect";
        case XDEV_INACTIVE:
                return "Inactive";
        case XDEV_POLLING:
                return "Polling";
        case XDEV_RECOVERY:
                return "Recovery";
        case XDEV_HOT_RESET:
                return "Hot Reset";
        case XDEV_COMP_MODE:
                return "Compliance mode";
        case XDEV_TEST_MODE:
                return "Test mode";
        case XDEV_RESUME:
                return "Resume";
        default:
                break;
        }
        return "Unknown";
}

static inline const char *xhci_decode_portsc(u32 portsc)
{
        static char str[256];
        int ret;

        ret = sprintf(str, "%s %s %s Link:%s PortSpeed:%d ",
                      portsc & PORT_POWER       ? "Powered" : "Powered-off",
                      portsc & PORT_CONNECT     ? "Connected" : "Not-connected",
                      portsc & PORT_PE          ? "Enabled" : "Disabled",
                      xhci_portsc_link_state_string(portsc),
                      DEV_PORT_SPEED(portsc));

        if (portsc & PORT_OC)
                ret += sprintf(str + ret, "OverCurrent ");
        if (portsc & PORT_RESET)
                ret += sprintf(str + ret, "In-Reset ");

        ret += sprintf(str + ret, "Change: ");
        if (portsc & PORT_CSC)
                ret += sprintf(str + ret, "CSC ");
        if (portsc & PORT_PEC)
                ret += sprintf(str + ret, "PEC ");
        if (portsc & PORT_WRC)
                ret += sprintf(str + ret, "WRC ");
        if (portsc & PORT_OCC)
                ret += sprintf(str + ret, "OCC ");
        if (portsc & PORT_RC)
                ret += sprintf(str + ret, "PRC ");
        if (portsc & PORT_PLC)
                ret += sprintf(str + ret, "PLC ");
        if (portsc & PORT_CEC)
                ret += sprintf(str + ret, "CEC ");
        if (portsc & PORT_CAS)
                ret += sprintf(str + ret, "CAS ");

        ret += sprintf(str + ret, "Wake: ");
        if (portsc & PORT_WKCONN_E)
                ret += sprintf(str + ret, "WCE ");
        if (portsc & PORT_WKDISC_E)
                ret += sprintf(str + ret, "WDE ");
        if (portsc & PORT_WKOC_E)
                ret += sprintf(str + ret, "WOE ");

        return str;
}

static inline const char *xhci_ep_state_string(u8 state)
{
        switch (state) {
        case EP_STATE_DISABLED:
                return "disabled";
        case EP_STATE_RUNNING:
                return "running";
        case EP_STATE_HALTED:
                return "halted";
        case EP_STATE_STOPPED:
                return "stopped";
        case EP_STATE_ERROR:
                return "error";
        default:
                return "INVALID";
        }
}

static inline const char *xhci_ep_type_string(u8 type)
{
        switch (type) {
        case ISOC_OUT_EP:
                return "Isoc OUT";
        case BULK_OUT_EP:
                return "Bulk OUT";
        case INT_OUT_EP:
                return "Int OUT";
        case CTRL_EP:
                return "Ctrl";
        case ISOC_IN_EP:
                return "Isoc IN";
        case BULK_IN_EP:
                return "Bulk IN";
        case INT_IN_EP:
                return "Int IN";
        default:
                return "INVALID";
        }
}

static inline const char *xhci_decode_ep_context(u32 info, u32 info2, u64 deq,
                u32 tx_info)
{
        static char str[1024];
        int ret;

        u32 esit;
        u16 maxp;
        u16 avg;

        u8 max_pstr;
        u8 ep_state;
        u8 interval;
        u8 ep_type;
        u8 burst;
        u8 cerr;
        u8 mult;

        bool lsa;
        bool hid;

        esit = CTX_TO_MAX_ESIT_PAYLOAD_HI(info) << 16 |
                CTX_TO_MAX_ESIT_PAYLOAD(tx_info);

        ep_state = info & EP_STATE_MASK;
        max_pstr = CTX_TO_EP_MAXPSTREAMS(info);
        interval = CTX_TO_EP_INTERVAL(info);
        mult = CTX_TO_EP_MULT(info) + 1;
        lsa = !!(info & EP_HAS_LSA);

        cerr = (info2 & (3 << 1)) >> 1;
        ep_type = CTX_TO_EP_TYPE(info2);
        hid = !!(info2 & (1 << 7));
        burst = CTX_TO_MAX_BURST(info2);
        maxp = MAX_PACKET_DECODED(info2);

        avg = EP_AVG_TRB_LENGTH(tx_info);

        ret = sprintf(str, "State %s mult %d max P. Streams %d %s",
                        xhci_ep_state_string(ep_state), mult,
                        max_pstr, lsa ? "LSA " : "");

        ret += sprintf(str + ret, "interval %d us max ESIT payload %d CErr %d ",
                        (1 << interval) * 125, esit, cerr);

        ret += sprintf(str + ret, "Type %s %sburst %d maxp %d deq %016llx ",
                        xhci_ep_type_string(ep_type), hid ? "HID" : "",
                        burst, maxp, deq);

        ret += sprintf(str + ret, "avg trb len %d", avg);

        return str;
}

#endif /* __LINUX_XHCI_HCD_H */