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xhci.h
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xhci.h
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/*
* xHCI host controller driver
*
* Copyright (C) 2008 Intel Corp.
*
* Author: Sarah Sharp
* Some code borrowed from the Linux EHCI driver.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __LINUX_XHCI_HCD_H
#define __LINUX_XHCI_HCD_H
#include <linux/usb.h>
#include <linux/timer.h>
#include <linux/kernel.h>
#include <linux/usb/hcd.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
*/
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;
/* 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)
/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
/* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
#define HCS_MAX_SCRATCHPAD(p) (((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))
/* 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)
/* db_off bitmask - bits 0:1 reserved */
#define DBOFF_MASK (~0x3)
/* run_regs_off bitmask - bits 0:4 reserved */
#define RTSOFF_MASK (~0x1f)
/* Number of registers per port */
#define NUM_PORT_REGS 4
/**
* struct xhci_op_regs - xHCI Host Controller Operational Registers.
* @command: USBCMD - xHC command register
* @status: USBSTS - xHC status register
* @page_size: This indicates the page size that the host controller
* supports. If bit n is set, the HC supports a page size
* of 2^(n+12), up to a 128MB page size.
* 4K is the minimum page size.
* @cmd_ring: CRP - 64-bit Command Ring Pointer
* @dcbaa_ptr: DCBAAP - 64-bit Device Context Base Address Array Pointer
* @config_reg: CONFIG - Configure Register
* @port_status_base: PORTSCn - base address for Port Status and Control
* Each port has a Port Status and Control register,
* followed by a Port Power Management Status and Control
* register, a Port Link Info register, and a reserved
* register.
* @port_power_base: PORTPMSCn - base address for
* Port Power Management Status and Control
* @port_link_base: PORTLIn - base address for Port Link Info (current
* Link PM state and control) for USB 2.1 and USB 3.0
* devices.
*/
struct xhci_op_regs {
__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)
/* bits 12:31 are reserved (and should be preserved on writes). */
/* IMAN - Interrupt Management Register */
#define IMAN_IP (1 << 1)
#define IMAN_IE (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)
/* bits 8:31 - reserved and should be preserved */
/* PORTSC - Port Status and Control Register - port_status_base bitmasks */
/* true: device connected */
#define PORT_CONNECT (1 << 0)
/* true: port enabled */
#define PORT_PE (1 << 1)
/* bit 2 reserved and zeroed */
/* true: port has an over-current condition */
#define PORT_OC (1 << 3)
/* true: port reset signaling asserted */
#define PORT_RESET (1 << 4)
/* Port Link State - bits 5:8
* A read gives the current link PM state of the port,
* a write with Link State Write Strobe set sets the link state.
*/
#define PORT_PLS_MASK (0xf << 5)
#define XDEV_U0 (0x0 << 5)
#define XDEV_U2 (0x2 << 5)
#define XDEV_U3 (0x3 << 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 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)
/* 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)
/* 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 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)
/* Inactivity timer value for transitions into U2 */
#define PORT_U2_TIMEOUT(p) (((p) & 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(p) (((p) & 0xff) << 8)
#define PORT_HLE (1 << 16)
/**
* 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_OFF(x) ((x) & 0xff)
#define XHCI_EXT_PORT_COUNT(x) (((x) >> 8) & 0xff)
/**
* 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)
/* 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)
/* 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)
/* 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
/* 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)
/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
#define EP_HAS_LSA (1 << 15)
/* 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)
/* Get max packet size from ep desc. Bit 10..0 specify the max packet size.
* USB2.0 spec 9.6.6.
*/
#define GET_MAX_PACKET(p) ((p) & 0x7ff)
/* tx_info bitmasks */
#define AVG_TRB_LENGTH_FOR_EP(p) ((p) & 0xffff)
#define MAX_ESIT_PAYLOAD_FOR_EP(p) (((p) & 0xffff) << 16)
#define CTX_TO_MAX_ESIT_PAYLOAD(p) (((p) >> 16) & 0xffff)
/* deq bitmasks */
#define EP_CTX_CYCLE_MASK (1 << 0)
/**
* 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;
/* 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) << 1) & 0x7)
/* Secondary stream array type, dequeue pointer is to a transfer ring */
#define SCT_SEC_TR 0
/* Primary stream array type, dequeue pointer is to a transfer ring */
#define SCT_PRI_TR 1
/* Dequeue pointer is for a secondary stream array (SSA) with 8 entries */
#define SCT_SSA_8 2
#define SCT_SSA_16 3
#define SCT_SSA_32 4
#define SCT_SSA_64 5
#define SCT_SSA_128 6
#define SCT_SSA_256 7
/* Assume no secondary streams for now */
struct xhci_stream_info {
struct xhci_ring **stream_rings;
/* Number of streams, including stream 0 (which drivers can't use) */
unsigned int num_streams;
/* The stream context array may be bigger than
* the number of streams the driver asked for
*/
struct xhci_stream_ctx *stream_ctx_array;
unsigned int num_stream_ctxs;
dma_addr_t ctx_array_dma;
/* For mapping physical TRB addresses to segments in stream rings */
struct radix_tree_root trb_address_map;
struct xhci_command *free_streams_command;
};
#define SMALL_STREAM_ARRAY_SIZE 256
#define MEDIUM_STREAM_ARRAY_SIZE 1024
/* 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_HALT_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;
/* The TRB that was last reported in a stopped endpoint ring */
union xhci_trb *stopped_trb;
struct xhci_td *stopped_td;
unsigned int stopped_stream;
/* Watchdog timer for stop endpoint command to cancel URBs */
struct timer_list stop_cmd_timer;
int stop_cmds_pending;
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;
};
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;
/* Rings saved to ensure old alt settings can be re-instated */
struct xhci_ring **ring_cache;
int num_rings_cached;
/* Store xHC assigned device address */
int address;
#define XHCI_MAX_RINGS_CACHED 31
struct xhci_virt_ep eps[31];
struct completion cmd_completion;
/* Status of the last command issued for this device */
u32 cmd_status;
struct list_head cmd_list;
u8 fake_port;
u8 real_port;
struct xhci_interval_bw_table *bw_table;
struct xhci_tt_bw_info *tt_info;
};
/*
* For each roothub, keep track of the bandwidth information for each periodic
* interval.
*
* If a high speed hub is attached to the roothub, each TT associated with that
* hub is a separate bandwidth domain. The interval information for the
* endpoints on the devices under that TT will appear in the TT structure.
*/
struct xhci_root_port_bw_info {
struct list_head tts;
unsigned int num_active_tts;
struct xhci_interval_bw_table bw_table;
};
struct xhci_tt_bw_info {
struct list_head tt_list;
int slot_id;
int ttport;
struct xhci_interval_bw_table bw_table;
int active_eps;
};
/**
* 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 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_SUCCESS 1
/* Data Buffer Error */
#define COMP_DB_ERR 2
/* Babble Detected Error */
#define COMP_BABBLE 3
/* USB Transaction Error */
#define COMP_TX_ERR 4
/* TRB Error - some TRB field is invalid */
#define COMP_TRB_ERR 5
/* Stall Error - USB device is stalled */
#define COMP_STALL 6
/* Resource Error - HC doesn't have memory for that device configuration */
#define COMP_ENOMEM 7
/* Bandwidth Error - not enough room in schedule for this dev config */
#define COMP_BW_ERR 8
/* No Slots Available Error - HC ran out of device slots */
#define COMP_ENOSLOTS 9
/* Invalid Stream Type Error */
#define COMP_STREAM_ERR 10
/* Slot Not Enabled Error - doorbell rung for disabled device slot */
#define COMP_EBADSLT 11
/* Endpoint Not Enabled Error */
#define COMP_EBADEP 12
/* Short Packet */