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linux/drivers/usb/host/xhci.h
Sarah Sharp 7f84eef0da USB: xhci: No-op command queueing and irq handler. 
xHCI host controllers can optionally implement a no-op test.  This
simple test ensures the OS has correctly setup all basic data structures
and can correctly respond to interrupts from the host controller
hardware.

There are two rings exercised by the no-op test:  the command ring, and
the event ring.

The host controller driver writes a no-op command TRB to the command
ring, and rings the doorbell for the command ring (the first entry in
the doorbell array).  The hardware receives this event, places a command
completion event on the event ring, and fires an interrupt.

The host controller driver sees the interrupt, and checks the event ring
for TRBs it can process, and sees the command completion event.  (See
the rules in xhci-ring.c for who "owns" a TRB.  This is a simplified set
of rules, and may not contain all the details that are in the xHCI 0.95
spec.)

A timer fires every 60 seconds to debug the state of the hardware and
command and event rings.  This timer only runs if
CONFIG_USB_XHCI_HCD_DEBUGGING is 'y'.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00

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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 "../core/hcd.h"
/* Code sharing between pci-quirks and xhci hcd */
#include "xhci-ext-caps.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
/*
* xHCI register interface.
* This corresponds to the eXtensible Host Controller Interface (xHCI)
* Revision 0.95 specification
*
* 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.
*/
/**
* 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 {
u32 hc_capbase;
u32 hcs_params1;
u32 hcs_params2;
u32 hcs_params3;
u32 hcc_params;
u32 db_off;
u32 run_regs_off;
/* Reserved up to (CAPLENGTH - 0x1C) */
} __attribute__ ((packed));
/* 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 */
/* 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 (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 {
u32 command;
u32 status;
u32 page_size;
u32 reserved1;
u32 reserved2;
u32 dev_notification;
u32 cmd_ring[2];
/* rsvd: offset 0x20-2F */
u32 reserved3[4];
u32 dcbaa_ptr[2];
u32 config_reg;
/* rsvd: offset 0x3C-3FF */
u32 reserved4[241];
/* port 1 registers, which serve as a base address for other ports */
u32 port_status_base;
u32 port_power_base;
u32 port_link_base;
u32 reserved5;
/* registers for ports 2-255 */
u32 reserved6[NUM_PORT_REGS*254];
} __attribute__ ((packed));
/* 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)
/* FIXME: ignoring host controller save/restore state for now. */
#define CMD_CSS (1 << 8)
#define CMD_CRS (1 << 9)
/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
#define CMD_EWE XHCI_CMD_EWE
/* MFINDEX power management - '1' means xHC can stop MFINDEX counter if all root
* hubs are in U3 (selective suspend), disconnect, disabled, or powered-off.
* '0' means the xHC can power it off if all ports are in the disconnect,
* disabled, or powered-off state.
*/
#define CMD_PM_INDEX (1 << 11)
/* bits 12:31 are reserved (and should be preserved on writes). */
/* USBSTS - USB status - status bitmasks */
/* HC not running - set to 1 when run/stop bit is cleared. */
#define STS_HALT XHCI_STS_HALT
/* serious error, e.g. PCI parity error. The HC will clear the run/stop bit. */
#define STS_FATAL (1 << 2)
/* event interrupt - clear this prior to clearing any IP flags in IR set*/
#define STS_EINT (1 << 3)
/* port change detect */
#define STS_PORT (1 << 4)
/* bits 5:7 reserved and zeroed */
/* save state status - '1' means xHC is saving state */
#define STS_SAVE (1 << 8)
/* restore state status - '1' means xHC is restoring state */
#define STS_RESTORE (1 << 9)
/* true: save or restore error */
#define STS_SRE (1 << 10)
/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
#define STS_CNR XHCI_STS_CNR
/* true: internal Host Controller Error - SW needs to reset and reinitialize */
#define STS_HCE (1 << 12)
/* bits 13:31 reserved and should be preserved */
/*
* DNCTRL - Device Notification Control Register - dev_notification bitmasks
* Generate a device notification event when the HC sees a transaction with a
* notification type that matches a bit set in this bit field.
*/
#define DEV_NOTE_MASK (0xffff)
#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_ADDR_MASK (0xffffffc0)
/* 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.
*/
/* 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 DEV_UNDEFSPEED(p) (((p) & DEV_SPEED_MASK) == (0x0<<10))
#define DEV_FULLSPEED(p) (((p) & DEV_SPEED_MASK) == (0x1<<10))
#define DEV_LOWSPEED(p) (((p) & DEV_SPEED_MASK) == (0x2<<10))
#define DEV_HIGHSPEED(p) (((p) & DEV_SPEED_MASK) == (0x3<<10))
#define DEV_SUPERSPEED(p) (((p) & DEV_SPEED_MASK) == (0x4<<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)
/* bit 24 reserved */
/* wake on connect (enable) */
#define PORT_WKCONN_E (1 << 25)
/* wake on disconnect (enable) */
#define PORT_WKDISC_E (1 << 26)
/* wake on over-current (enable) */
#define PORT_WKOC_E (1 << 27)
/* bits 28:29 reserved */
/* true: device is removable - for USB 3.0 roothub emulation */
#define PORT_DEV_REMOVE (1 << 30)
/* Initiate a warm port reset - complete when PORT_WRC is '1' */
#define PORT_WR (1 << 31)
/* 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 */
/**
* struct 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 intr_reg {
u32 irq_pending;
u32 irq_control;
u32 erst_size;
u32 rsvd;
u32 erst_base[2];
u32 erst_dequeue[2];
} __attribute__ ((packed));
/* 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 {
u32 microframe_index;
u32 rsvd[7];
struct intr_reg ir_set[128];
} __attribute__ ((packed));
/**
* struct doorbell_array
*
* Section 5.6
*/
struct xhci_doorbell_array {
u32 doorbell[256];
} __attribute__ ((packed));
#define DB_TARGET_MASK 0xFFFFFF00
#define DB_STREAM_ID_MASK 0x0000FFFF
#define DB_TARGET_HOST 0x0
#define DB_STREAM_ID_HOST 0x0
#define DB_MASK (0xff << 8)
/**
* 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 {
u32 dev_info;
u32 dev_info2;
u32 tt_info;
u32 dev_state;
/* offset 0x10 to 0x1f reserved for HC internal use */
u32 reserved[4];
} __attribute__ ((packed));
/* 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_EP_MASK (0x1f << 27)
#define LAST_EP(p) ((p) << 27)
/* 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 (0xff << 16)
/* 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)
/* dev_state bitmasks */
/* USB device address - assigned by the HC */
#define DEV_ADDR (0xff)
/* bits 8:26 reserved */
/* Slot state */
#define SLOT_STATE (0x1f << 27)
/**
* 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.
* @ep_ring: 64-bit ring address. If the endpoint only defines one flow,
* this points to the endpoint transfer ring. Otherwise, it points
* to a flow context array, which has a ring pointer for each flow.
* @intr_target:
* 64-bit address of the Interrupter Target that will receive
* events from this endpoint.
*
* 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 {
u32 ep_info;
u32 ep_info2;
/* 64-bit endpoint ring address */
u32 ep_ring[2];
/* 64-bit address of the interrupter target */
u32 intr_target[2];
/* offset 0x14 - 0x1f reserved for HC internal use */
u32 reserved[2];
} __attribute__ ((packed));
/* 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 (0xf)
/* Mult - Max number of burtst within an interval, in EP companion desc. */
#define EP_MULT(p) ((p & 0x3) << 8)
/* 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 (0xff << 16)
/* 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 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 MAX_PACKET(p) (((p)&0xffff) << 16)
/**
* struct xhci_device_control
* Input/Output 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_device_control {
u32 drop_flags;
u32 add_flags;
u32 rsvd[6];
struct xhci_slot_ctx slot;
struct xhci_ep_ctx ep[31];
} __attribute__ ((packed));
/* drop context bitmasks */
#define DROP_EP(x) (0x1 << x)
/* add context bitmasks */
#define ADD_EP(x) (0x1 << x)
/**
* 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 */
u32 dev_context_ptrs[2*MAX_HC_SLOTS];
/* private xHCD pointers */
dma_addr_t dma;
} __attribute__ ((packed));
/* 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_stream_ctx {
/* 64-bit stream ring address, cycle state, and stream type */
u32 stream_ring[2];
/* offset 0x14 - 0x1f reserved for HC internal use */
u32 reserved[2];
} __attribute__ ((packed));
struct xhci_transfer_event {
/* 64-bit buffer address, or immediate data */
u32 buffer[2];
u32 transfer_len;
/* This field is interpreted differently based on the type of TRB */
u32 flags;
} __attribute__ ((packed));
/* Completion Code - only applicable for some types of TRBs */
#define COMP_CODE_MASK (0xff << 24)
#define GET_COMP_CODE(p) (((p) & COMP_CODE_MASK) >> 24)
#define COMP_SUCCESS 1
/* Data Buffer Error */
#define COMP_DB_ERR 2
/* Babble Detected Error */
#define COMP_BABBLE 3
/* USB Transaction Error */
#define COMP_TX_ERR 4
/* TRB Error - some TRB field is invalid */
#define COMP_TRB_ERR 5
/* Stall Error - USB device is stalled */
#define COMP_STALL 6
/* Resource Error - HC doesn't have memory for that device configuration */
#define COMP_ENOMEM 7
/* Bandwidth Error - not enough room in schedule for this dev config */
#define COMP_BW_ERR 8
/* No Slots Available Error - HC ran out of device slots */
#define COMP_ENOSLOTS 9
/* Invalid Stream Type Error */
#define COMP_STREAM_ERR 10
/* Slot Not Enabled Error - doorbell rung for disabled device slot */
#define COMP_EBADSLT 11
/* Endpoint Not Enabled Error */
#define COMP_EBADEP 12
/* Short Packet */
#define COMP_SHORT_TX 13
/* Ring Underrun - doorbell rung for an empty isoc OUT ep ring */
#define COMP_UNDERRUN 14
/* Ring Overrun - isoc IN ep ring is empty when ep is scheduled to RX */
#define COMP_OVERRUN 15
/* Virtual Function Event Ring Full Error */
#define COMP_VF_FULL 16
/* Parameter Error - Context parameter is invalid */
#define COMP_EINVAL 17
/* Bandwidth Overrun Error - isoc ep exceeded its allocated bandwidth */
#define COMP_BW_OVER 18
/* Context State Error - illegal context state transition requested */
#define COMP_CTX_STATE 19
/* No Ping Response Error - HC didn't get PING_RESPONSE in time to TX */
#define COMP_PING_ERR 20
/* Event Ring is full */
#define COMP_ER_FULL 21
/* Missed Service Error - HC couldn't service an isoc ep within interval */
#define COMP_MISSED_INT 23
/* Successfully stopped command ring */
#define COMP_CMD_STOP 24
/* Successfully aborted current command and stopped command ring */
#define COMP_CMD_ABORT 25
/* Stopped - transfer was terminated by a stop endpoint command */
#define COMP_STOP 26
/* Same as COMP_EP_STOPPED, but the transfered length in the event is invalid */
#define COMP_STOP_INVAL 27
/* Control Abort Error - Debug Capability - control pipe aborted */
#define COMP_DBG_ABORT 28
/* TRB type 29 and 30 reserved */
/* Isoc Buffer Overrun - an isoc IN ep sent more data than could fit in TD */
#define COMP_BUFF_OVER 31
/* Event Lost Error - xHC has an "internal event overrun condition" */
#define COMP_ISSUES 32
/* Undefined Error - reported when other error codes don't apply */
#define COMP_UNKNOWN 33
/* Invalid Stream ID Error */
#define COMP_STRID_ERR 34
/* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */
/* FIXME - check for this */
#define COMP_2ND_BW_ERR 35
/* Split Transaction Error */
#define COMP_SPLIT_ERR 36
struct xhci_link_trb {
/* 64-bit segment pointer*/
u32 segment_ptr[2];
u32 intr_target;
u32 control;
} __attribute__ ((packed));
/* 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 */
u32 cmd_trb[2];
u32 status;
u32 flags;
} __attribute__ ((packed));
/* Normal TRB fields */
/* transfer_len bitmasks - bits 0:16 */
#define TRB_LEN(p) ((p) & 0x1ffff)
/* TD size - number of bytes remaining in the TD (including this TRB):
* bits 17 - 21. Shift the number of bytes by 10. */
#define TD_REMAINDER(p) ((((p) >> 10) & 0x1f) << 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)
/* 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)
/* Control transfer TRB specific fields */
#define TRB_DIR_IN (1<<16)
struct xhci_generic_trb {
u32 field[4];
} __attribute__ ((packed));
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)
/* 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 Transfer Ring Command */
#define TRB_RESET_RING 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 */
/*
* TRBS_PER_SEGMENT must be a multiple of 4,
* since the command ring is 64-byte aligned.
* It must also be greater than 16.
*/
#define TRBS_PER_SEGMENT 64
#define SEGMENT_SIZE (TRBS_PER_SEGMENT*16)
struct xhci_segment {
union xhci_trb *trbs;
/* private to HCD */
struct xhci_segment *next;
dma_addr_t dma;
} __attribute__ ((packed));
struct xhci_ring {
struct xhci_segment *first_seg;
union xhci_trb *enqueue;
struct xhci_segment *enq_seg;
unsigned int enq_updates;
union xhci_trb *dequeue;
struct xhci_segment *deq_seg;
unsigned int deq_updates;
/*
* 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;
};
struct xhci_erst_entry {
/* 64-bit event ring segment address */
u32 seg_addr[2];
u32 seg_size;
/* Set to zero */
u32 rsvd;
} __attribute__ ((packed));
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;
};
/*
* 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
/* XXX: Make these module parameters */
/* There is one ehci_hci structure per controller */
struct xhci_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 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;
spinlock_t lock;
/* packed release number */
u8 sbrn;
u16 hci_version;
u8 max_slots;
u8 max_interrupters;
u8 max_ports;
u8 isoc_threshold;
int event_ring_max;
int addr_64;
/* 4KB min, 128MB max */
int page_size;
/* Valid values are 12 to 20, inclusive */
int page_shift;
/* only one MSI vector for now, but might need more later */
int msix_count;
struct msix_entry *msix_entries;
/* data structures */
struct xhci_device_context_array *dcbaa;
struct xhci_ring *cmd_ring;
struct xhci_ring *event_ring;
struct xhci_erst erst;
/* DMA pools */
struct dma_pool *device_pool;
struct dma_pool *segment_pool;
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
/* Poll the rings - for debugging */
struct timer_list event_ring_timer;
int zombie;
#endif
/* Statistics */
int noops_submitted;
int noops_handled;
int error_bitmask;
};
/* For testing purposes */
#define NUM_TEST_NOOPS 0
/* convert between an HCD pointer and the corresponding EHCI_HCD */
static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
{
return (struct xhci_hcd *) (hcd->hcd_priv);
}
static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
{
return container_of((void *) xhci, struct usb_hcd, hcd_priv);
}
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
#define XHCI_DEBUG 1
#else
#define XHCI_DEBUG 0
#endif
#define xhci_dbg(xhci, fmt, args...) \
do { if (XHCI_DEBUG) dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_info(xhci, fmt, args...) \
do { if (XHCI_DEBUG) dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_err(xhci, fmt, args...) \
dev_err(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_warn(xhci, fmt, args...) \
dev_warn(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
/* TODO: copied from ehci.h - can be refactored? */
/* xHCI spec says all registers are little endian */
static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
__u32 __iomem *regs)
{
return readl(regs);
}
static inline void xhci_writel(const struct xhci_hcd *xhci,
const unsigned int val, __u32 __iomem *regs)
{
if (!in_interrupt())
xhci_dbg(xhci, "`MEM_WRITE_DWORD(3'b000, 32'h%0x, 32'h%0x, 4'hf);\n",
(unsigned int) regs, val);
writel(val, regs);
}
/* xHCI debugging */
void xhci_print_ir_set(struct xhci_hcd *xhci, struct intr_reg *ir_set, int set_num);
void xhci_print_registers(struct xhci_hcd *xhci);
void xhci_dbg_regs(struct xhci_hcd *xhci);
void xhci_print_run_regs(struct xhci_hcd *xhci);
void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg);
void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring);
void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci);
void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring);
/* xHCI memory managment */
void xhci_mem_cleanup(struct xhci_hcd *xhci);
int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
#ifdef CONFIG_PCI
/* xHCI PCI glue */
int xhci_register_pci(void);
void xhci_unregister_pci(void);
#endif
/* xHCI host controller glue */
int xhci_halt(struct xhci_hcd *xhci);
int xhci_reset(struct xhci_hcd *xhci);
int xhci_init(struct usb_hcd *hcd);
int xhci_run(struct usb_hcd *hcd);
void xhci_stop(struct usb_hcd *hcd);
void xhci_shutdown(struct usb_hcd *hcd);
int xhci_get_frame(struct usb_hcd *hcd);
irqreturn_t xhci_irq(struct usb_hcd *hcd);
/* xHCI ring, segment, TRB, and TD functions */
dma_addr_t trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
void ring_cmd_db(struct xhci_hcd *xhci);
void *setup_one_noop(struct xhci_hcd *xhci);
void handle_event(struct xhci_hcd *xhci);
void set_hc_event_deq(struct xhci_hcd *xhci);
#endif /* __LINUX_XHCI_HCD_H */
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