drivers/usb/host/uhci-hcd.h - kernel/msm-4.9 - Gitiles

 #ifndef __LINUX_UHCI_HCD_H
 #define __LINUX_UHCI_HCD_H

 #include <linux/list.h>
 #include <linux/usb.h>

 #define usb_packetid(pipe)	(usb_pipein(pipe) ? USB_PID_IN : USB_PID_OUT)
 #define PIPE_DEVEP_MASK		0x0007ff00


 /*
  * Universal Host Controller Interface data structures and defines
  */

 /* Command register */
 #define USBCMD		0
 #define   USBCMD_RS		0x0001	/* Run/Stop */
 #define   USBCMD_HCRESET	0x0002	/* Host reset */
 #define   USBCMD_GRESET		0x0004	/* Global reset */
 #define   USBCMD_EGSM		0x0008	/* Global Suspend Mode */
 #define   USBCMD_FGR		0x0010	/* Force Global Resume */
 #define   USBCMD_SWDBG		0x0020	/* SW Debug mode */
 #define   USBCMD_CF		0x0040	/* Config Flag (sw only) */
 #define   USBCMD_MAXP		0x0080	/* Max Packet (0 = 32, 1 = 64) */

 /* Status register */
 #define USBSTS		2
 #define   USBSTS_USBINT		0x0001	/* Interrupt due to IOC */
 #define   USBSTS_ERROR		0x0002	/* Interrupt due to error */
 #define   USBSTS_RD		0x0004	/* Resume Detect */
 #define   USBSTS_HSE		0x0008	/* Host System Error: PCI problems */
 #define   USBSTS_HCPE		0x0010	/* Host Controller Process Error:
 					 * the schedule is buggy */
 #define   USBSTS_HCH		0x0020	/* HC Halted */

 /* Interrupt enable register */
 #define USBINTR		4
 #define   USBINTR_TIMEOUT	0x0001	/* Timeout/CRC error enable */
 #define   USBINTR_RESUME	0x0002	/* Resume interrupt enable */
 #define   USBINTR_IOC		0x0004	/* Interrupt On Complete enable */
 #define   USBINTR_SP		0x0008	/* Short packet interrupt enable */

 #define USBFRNUM	6
 #define USBFLBASEADD	8
 #define USBSOF		12
 #define   USBSOF_DEFAULT	64	/* Frame length is exactly 1 ms */

 /* USB port status and control registers */
 #define USBPORTSC1	16
 #define USBPORTSC2	18
 #define   USBPORTSC_CCS		0x0001	/* Current Connect Status
 					 * ("device present") */
 #define   USBPORTSC_CSC		0x0002	/* Connect Status Change */
 #define   USBPORTSC_PE		0x0004	/* Port Enable */
 #define   USBPORTSC_PEC		0x0008	/* Port Enable Change */
 #define   USBPORTSC_DPLUS	0x0010	/* D+ high (line status) */
 #define   USBPORTSC_DMINUS	0x0020	/* D- high (line status) */
 #define   USBPORTSC_RD		0x0040	/* Resume Detect */
 #define   USBPORTSC_RES1	0x0080	/* reserved, always 1 */
 #define   USBPORTSC_LSDA	0x0100	/* Low Speed Device Attached */
 #define   USBPORTSC_PR		0x0200	/* Port Reset */
 /* OC and OCC from Intel 430TX and later (not UHCI 1.1d spec) */
 #define   USBPORTSC_OC		0x0400	/* Over Current condition */
 #define   USBPORTSC_OCC		0x0800	/* Over Current Change R/WC */
 #define   USBPORTSC_SUSP	0x1000	/* Suspend */
 #define   USBPORTSC_RES2	0x2000	/* reserved, write zeroes */
 #define   USBPORTSC_RES3	0x4000	/* reserved, write zeroes */
 #define   USBPORTSC_RES4	0x8000	/* reserved, write zeroes */

 /* Legacy support register */
 #define USBLEGSUP		0xc0
 #define   USBLEGSUP_DEFAULT	0x2000	/* only PIRQ enable set */
 #define   USBLEGSUP_RWC		0x8f00	/* the R/WC bits */
 #define   USBLEGSUP_RO		0x5040	/* R/O and reserved bits */

 #define UHCI_PTR_BITS		__constant_cpu_to_le32(0x000F)
 #define UHCI_PTR_TERM		__constant_cpu_to_le32(0x0001)
 #define UHCI_PTR_QH		__constant_cpu_to_le32(0x0002)
 #define UHCI_PTR_DEPTH		__constant_cpu_to_le32(0x0004)
 #define UHCI_PTR_BREADTH	__constant_cpu_to_le32(0x0000)

 #define UHCI_NUMFRAMES		1024	/* in the frame list [array] */
 #define UHCI_MAX_SOF_NUMBER	2047	/* in an SOF packet */
 #define CAN_SCHEDULE_FRAMES	1000	/* how far in the future frames
 					 * can be scheduled */

 /* When no queues need Full-Speed Bandwidth Reclamation,
  * delay this long before turning FSBR off */
 #define FSBR_OFF_DELAY		msecs_to_jiffies(10)

 /* If a queue hasn't advanced after this much time, assume it is stuck */
 #define QH_WAIT_TIMEOUT		msecs_to_jiffies(200)


 /*
  *	Queue Headers
  */

 /*
  * One role of a QH is to hold a queue of TDs for some endpoint.  One QH goes
  * with each endpoint, and qh->element (updated by the HC) is either:
  *   - the next unprocessed TD in the endpoint's queue, or
  *   - UHCI_PTR_TERM (when there's no more traffic for this endpoint).
  *
  * The other role of a QH is to serve as a "skeleton" framelist entry, so we
  * can easily splice a QH for some endpoint into the schedule at the right
  * place.  Then qh->element is UHCI_PTR_TERM.
  *
  * In the schedule, qh->link maintains a list of QHs seen by the HC:
  *     skel1 --> ep1-qh --> ep2-qh --> ... --> skel2 --> ...
  *
  * qh->node is the software equivalent of qh->link.  The differences
  * are that the software list is doubly-linked and QHs in the UNLINKING
  * state are on the software list but not the hardware schedule.
  *
  * For bookkeeping purposes we maintain QHs even for Isochronous endpoints,
  * but they never get added to the hardware schedule.
  */
 #define QH_STATE_IDLE		1	/* QH is not being used */
 #define QH_STATE_UNLINKING	2	/* QH has been removed from the
 					 * schedule but the hardware may
 					 * still be using it */
 #define QH_STATE_ACTIVE		3	/* QH is on the schedule */

 struct uhci_qh {
 	/* Hardware fields */
 	__le32 link;			/* Next QH in the schedule */
 	__le32 element;			/* Queue element (TD) pointer */

 	/* Software fields */
 	struct list_head node;		/* Node in the list of QHs */
 	struct usb_host_endpoint *hep;	/* Endpoint information */
 	struct usb_device *udev;
 	struct list_head queue;		/* Queue of urbps for this QH */
 	struct uhci_qh *skel;		/* Skeleton for this QH */
 	struct uhci_td *dummy_td;	/* Dummy TD to end the queue */
 	struct uhci_td *post_td;	/* Last TD completed */

 	struct usb_iso_packet_descriptor *iso_packet_desc;
 					/* Next urb->iso_frame_desc entry */
 	unsigned long advance_jiffies;	/* Time of last queue advance */
 	unsigned int unlink_frame;	/* When the QH was unlinked */
 	unsigned int period;		/* For Interrupt and Isochronous QHs */
 	unsigned int iso_frame;		/* Frame # for iso_packet_desc */
 	int iso_status;			/* Status for Isochronous URBs */

 	int state;			/* QH_STATE_xxx; see above */
 	int type;			/* Queue type (control, bulk, etc) */

 	dma_addr_t dma_handle;

 	unsigned int initial_toggle:1;	/* Endpoint's current toggle value */
 	unsigned int needs_fixup:1;	/* Must fix the TD toggle values */
 	unsigned int is_stopped:1;	/* Queue was stopped by error/unlink */
 	unsigned int wait_expired:1;	/* QH_WAIT_TIMEOUT has expired */
 } __attribute__((aligned(16)));

 /*
  * We need a special accessor for the element pointer because it is
  * subject to asynchronous updates by the controller.
  */
 static inline __le32 qh_element(struct uhci_qh *qh) {
 	__le32 element = qh->element;

 	barrier();
 	return element;
 }


 /*
  *	Transfer Descriptors
  */

 /*
  * for TD <status>:
  */
 #define TD_CTRL_SPD		(1 << 29)	/* Short Packet Detect */
 #define TD_CTRL_C_ERR_MASK	(3 << 27)	/* Error Counter bits */
 #define TD_CTRL_C_ERR_SHIFT	27
 #define TD_CTRL_LS		(1 << 26)	/* Low Speed Device */
 #define TD_CTRL_IOS		(1 << 25)	/* Isochronous Select */
 #define TD_CTRL_IOC		(1 << 24)	/* Interrupt on Complete */
 #define TD_CTRL_ACTIVE		(1 << 23)	/* TD Active */
 #define TD_CTRL_STALLED		(1 << 22)	/* TD Stalled */
 #define TD_CTRL_DBUFERR		(1 << 21)	/* Data Buffer Error */
 #define TD_CTRL_BABBLE		(1 << 20)	/* Babble Detected */
 #define TD_CTRL_NAK		(1 << 19)	/* NAK Received */
 #define TD_CTRL_CRCTIMEO	(1 << 18)	/* CRC/Time Out Error */
 #define TD_CTRL_BITSTUFF	(1 << 17)	/* Bit Stuff Error */
 #define TD_CTRL_ACTLEN_MASK	0x7FF	/* actual length, encoded as n - 1 */

 #define TD_CTRL_ANY_ERROR	(TD_CTRL_STALLED | TD_CTRL_DBUFERR | \
 				 TD_CTRL_BABBLE | TD_CTRL_CRCTIME | \
 				 TD_CTRL_BITSTUFF)

 #define uhci_maxerr(err)		((err) << TD_CTRL_C_ERR_SHIFT)
 #define uhci_status_bits(ctrl_sts)	((ctrl_sts) & 0xF60000)
 #define uhci_actual_length(ctrl_sts)	(((ctrl_sts) + 1) & \
 			TD_CTRL_ACTLEN_MASK)	/* 1-based */

 /*
  * for TD <info>: (a.k.a. Token)
  */
 #define td_token(td)		le32_to_cpu((td)->token)
 #define TD_TOKEN_DEVADDR_SHIFT	8
 #define TD_TOKEN_TOGGLE_SHIFT	19
 #define TD_TOKEN_TOGGLE		(1 << 19)
 #define TD_TOKEN_EXPLEN_SHIFT	21
 #define TD_TOKEN_EXPLEN_MASK	0x7FF	/* expected length, encoded as n-1 */
 #define TD_TOKEN_PID_MASK	0xFF

 #define uhci_explen(len)	((((len) - 1) & TD_TOKEN_EXPLEN_MASK) << \
 					TD_TOKEN_EXPLEN_SHIFT)

 #define uhci_expected_length(token) ((((token) >> TD_TOKEN_EXPLEN_SHIFT) + \
 					1) & TD_TOKEN_EXPLEN_MASK)
 #define uhci_toggle(token)	(((token) >> TD_TOKEN_TOGGLE_SHIFT) & 1)
 #define uhci_endpoint(token)	(((token) >> 15) & 0xf)
 #define uhci_devaddr(token)	(((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7f)
 #define uhci_devep(token)	(((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7ff)
 #define uhci_packetid(token)	((token) & TD_TOKEN_PID_MASK)
 #define uhci_packetout(token)	(uhci_packetid(token) != USB_PID_IN)
 #define uhci_packetin(token)	(uhci_packetid(token) == USB_PID_IN)

 /*
  * The documentation says "4 words for hardware, 4 words for software".
  *
  * That's silly, the hardware doesn't care. The hardware only cares that
  * the hardware words are 16-byte aligned, and we can have any amount of
  * sw space after the TD entry.
  *
  * td->link points to either another TD (not necessarily for the same urb or
  * even the same endpoint), or nothing (PTR_TERM), or a QH.
  */
 struct uhci_td {
 	/* Hardware fields */
 	__le32 link;
 	__le32 status;
 	__le32 token;
 	__le32 buffer;

 	/* Software fields */
 	dma_addr_t dma_handle;

 	struct list_head list;

 	int frame;			/* for iso: what frame? */
 	struct list_head fl_list;
 } __attribute__((aligned(16)));

 /*
  * We need a special accessor for the control/status word because it is
  * subject to asynchronous updates by the controller.
  */
 static inline u32 td_status(struct uhci_td *td) {
 	__le32 status = td->status;

 	barrier();
 	return le32_to_cpu(status);
 }


 /*
  *	Skeleton Queue Headers
  */

 /*
  * The UHCI driver uses QHs with Interrupt, Control and Bulk URBs for
  * automatic queuing. To make it easy to insert entries into the schedule,
  * we have a skeleton of QHs for each predefined Interrupt latency,
  * low-speed control, full-speed control, bulk, and terminating QH
  * (see explanation for the terminating QH below).
  *
  * When we want to add a new QH, we add it to the end of the list for the
  * skeleton QH.  For instance, the schedule list can look like this:
  *
  * skel int128 QH
  * dev 1 interrupt QH
  * dev 5 interrupt QH
  * skel int64 QH
  * skel int32 QH
  * ...
  * skel int1 QH
  * skel low-speed control QH
  * dev 5 control QH
  * skel full-speed control QH
  * skel bulk QH
  * dev 1 bulk QH
  * dev 2 bulk QH
  * skel terminating QH
  *
  * The terminating QH is used for 2 reasons:
  * - To place a terminating TD which is used to workaround a PIIX bug
  *   (see Intel errata for explanation), and
  * - To loop back to the full-speed control queue for full-speed bandwidth
  *   reclamation.
  *
  * There's a special skeleton QH for Isochronous QHs.  It never appears
  * on the schedule, and Isochronous TDs go on the schedule before the
  * the skeleton QHs.  The hardware accesses them directly rather than
  * through their QH, which is used only for bookkeeping purposes.
  * While the UHCI spec doesn't forbid the use of QHs for Isochronous,
  * it doesn't use them either.  And the spec says that queues never
  * advance on an error completion status, which makes them totally
  * unsuitable for Isochronous transfers.
  */

 #define UHCI_NUM_SKELQH		14
 #define skel_unlink_qh		skelqh[0]
 #define skel_iso_qh		skelqh[1]
 #define skel_int128_qh		skelqh[2]
 #define skel_int64_qh		skelqh[3]
 #define skel_int32_qh		skelqh[4]
 #define skel_int16_qh		skelqh[5]
 #define skel_int8_qh		skelqh[6]
 #define skel_int4_qh		skelqh[7]
 #define skel_int2_qh		skelqh[8]
 #define skel_int1_qh		skelqh[9]
 #define skel_ls_control_qh	skelqh[10]
 #define skel_fs_control_qh	skelqh[11]
 #define skel_bulk_qh		skelqh[12]
 #define skel_term_qh		skelqh[13]

 /* Find the skelqh entry corresponding to an interval exponent */
 #define UHCI_SKEL_INDEX(exponent)	(9 - exponent)


 /*
  *	The UHCI controller and root hub
  */

 /*
  * States for the root hub:
  *
  * To prevent "bouncing" in the presence of electrical noise,
  * when there are no devices attached we delay for 1 second in the
  * RUNNING_NODEVS state before switching to the AUTO_STOPPED state.
  *
  * (Note that the AUTO_STOPPED state won't be necessary once the hub
  * driver learns to autosuspend.)
  */
 enum uhci_rh_state {
 	/* In the following states the HC must be halted.
 	 * These two must come first. */
 	UHCI_RH_RESET,
 	UHCI_RH_SUSPENDED,

 	UHCI_RH_AUTO_STOPPED,
 	UHCI_RH_RESUMING,

 	/* In this state the HC changes from running to halted,
 	 * so it can legally appear either way. */
 	UHCI_RH_SUSPENDING,

 	/* In the following states it's an error if the HC is halted.
 	 * These two must come last. */
 	UHCI_RH_RUNNING,		/* The normal state */
 	UHCI_RH_RUNNING_NODEVS,		/* Running with no devices attached */
 };

 /*
  * The full UHCI controller information:
  */
 struct uhci_hcd {

 	/* debugfs */
 	struct dentry *dentry;

 	/* Grabbed from PCI */
 	unsigned long io_addr;

 	struct dma_pool *qh_pool;
 	struct dma_pool *td_pool;

 	struct uhci_td *term_td;	/* Terminating TD, see UHCI bug */
 	struct uhci_qh *skelqh[UHCI_NUM_SKELQH];	/* Skeleton QHs */
 	struct uhci_qh *next_qh;	/* Next QH to scan */

 	spinlock_t lock;

 	dma_addr_t frame_dma_handle;	/* Hardware frame list */
 	__le32 *frame;
 	void **frame_cpu;		/* CPU's frame list */

 	enum uhci_rh_state rh_state;
 	unsigned long auto_stop_time;		/* When to AUTO_STOP */

 	unsigned int frame_number;		/* As of last check */
 	unsigned int is_stopped;
 #define UHCI_IS_STOPPED		9999		/* Larger than a frame # */
 	unsigned int last_iso_frame;		/* Frame of last scan */
 	unsigned int cur_iso_frame;		/* Frame for current scan */

 	unsigned int scan_in_progress:1;	/* Schedule scan is running */
 	unsigned int need_rescan:1;		/* Redo the schedule scan */
 	unsigned int dead:1;			/* Controller has died */
 	unsigned int working_RD:1;		/* Suspended root hub doesn't
 						   need to be polled */
 	unsigned int is_initialized:1;		/* Data structure is usable */
 	unsigned int fsbr_is_on:1;		/* FSBR is turned on */
 	unsigned int fsbr_is_wanted:1;		/* Does any URB want FSBR? */
 	unsigned int fsbr_expiring:1;		/* FSBR is timing out */

 	struct timer_list fsbr_timer;		/* For turning off FBSR */

 	/* Support for port suspend/resume/reset */
 	unsigned long port_c_suspend;		/* Bit-arrays of ports */
 	unsigned long resuming_ports;
 	unsigned long ports_timeout;		/* Time to stop signalling */

 	struct list_head idle_qh_list;		/* Where the idle QHs live */

 	int rh_numports;			/* Number of root-hub ports */

 	wait_queue_head_t waitqh;		/* endpoint_disable waiters */
 	int num_waiting;			/* Number of waiters */
 };

 /* Convert between a usb_hcd pointer and the corresponding uhci_hcd */
 static inline struct uhci_hcd *hcd_to_uhci(struct usb_hcd *hcd)
 {
 	return (struct uhci_hcd *) (hcd->hcd_priv);
 }
 static inline struct usb_hcd *uhci_to_hcd(struct uhci_hcd *uhci)
 {
 	return container_of((void *) uhci, struct usb_hcd, hcd_priv);
 }

 #define uhci_dev(u)	(uhci_to_hcd(u)->self.controller)

 /* Utility macro for comparing frame numbers */
 #define uhci_frame_before_eq(f1, f2)	(0 <= (int) ((f2) - (f1)))


 /*
  *	Private per-URB data
  */
 struct urb_priv {
 	struct list_head node;		/* Node in the QH's urbp list */

 	struct urb *urb;

 	struct uhci_qh *qh;		/* QH for this URB */
 	struct list_head td_list;

 	unsigned fsbr:1;		/* URB wants FSBR */
 };


 /*
  * Locking in uhci.c
  *
  * Almost everything relating to the hardware schedule and processing
  * of URBs is protected by uhci->lock.  urb->status is protected by
  * urb->lock; that's the one exception.
  *
  * To prevent deadlocks, never lock uhci->lock while holding urb->lock.
  * The safe order of locking is:
  *
  * #1 uhci->lock
  * #2 urb->lock
  */


 /* Some special IDs */

 #define PCI_VENDOR_ID_GENESYS		0x17a0
 #define PCI_DEVICE_ID_GL880S_UHCI	0x8083

 #endif
	#ifndef __LINUX_UHCI_HCD_H
	#define __LINUX_UHCI_HCD_H

	#include <linux/list.h>
	#include <linux/usb.h>

	#define usb_packetid(pipe) (usb_pipein(pipe) ? USB_PID_IN : USB_PID_OUT)
	#define PIPE_DEVEP_MASK 0x0007ff00


	/*
	* Universal Host Controller Interface data structures and defines
	*/

	/* Command register */
	#define USBCMD 0
	#define USBCMD_RS 0x0001 /* Run/Stop */
	#define USBCMD_HCRESET 0x0002 /* Host reset */
	#define USBCMD_GRESET 0x0004 /* Global reset */
	#define USBCMD_EGSM 0x0008 /* Global Suspend Mode */
	#define USBCMD_FGR 0x0010 /* Force Global Resume */
	#define USBCMD_SWDBG 0x0020 /* SW Debug mode */
	#define USBCMD_CF 0x0040 /* Config Flag (sw only) */
	#define USBCMD_MAXP 0x0080 /* Max Packet (0 = 32, 1 = 64) */

	/* Status register */
	#define USBSTS 2
	#define USBSTS_USBINT 0x0001 /* Interrupt due to IOC */
	#define USBSTS_ERROR 0x0002 /* Interrupt due to error */
	#define USBSTS_RD 0x0004 /* Resume Detect */
	#define USBSTS_HSE 0x0008 /* Host System Error: PCI problems */
	#define USBSTS_HCPE 0x0010 /* Host Controller Process Error:
	* the schedule is buggy */
	#define USBSTS_HCH 0x0020 /* HC Halted */

	/* Interrupt enable register */
	#define USBINTR 4
	#define USBINTR_TIMEOUT 0x0001 /* Timeout/CRC error enable */
	#define USBINTR_RESUME 0x0002 /* Resume interrupt enable */
	#define USBINTR_IOC 0x0004 /* Interrupt On Complete enable */
	#define USBINTR_SP 0x0008 /* Short packet interrupt enable */

	#define USBFRNUM 6
	#define USBFLBASEADD 8
	#define USBSOF 12
	#define USBSOF_DEFAULT 64 /* Frame length is exactly 1 ms */

	/* USB port status and control registers */
	#define USBPORTSC1 16
	#define USBPORTSC2 18
	#define USBPORTSC_CCS 0x0001 /* Current Connect Status
	* ("device present") */
	#define USBPORTSC_CSC 0x0002 /* Connect Status Change */
	#define USBPORTSC_PE 0x0004 /* Port Enable */
	#define USBPORTSC_PEC 0x0008 /* Port Enable Change */
	#define USBPORTSC_DPLUS 0x0010 /* D+ high (line status) */
	#define USBPORTSC_DMINUS 0x0020 /* D- high (line status) */
	#define USBPORTSC_RD 0x0040 /* Resume Detect */
	#define USBPORTSC_RES1 0x0080 /* reserved, always 1 */
	#define USBPORTSC_LSDA 0x0100 /* Low Speed Device Attached */
	#define USBPORTSC_PR 0x0200 /* Port Reset */
	/* OC and OCC from Intel 430TX and later (not UHCI 1.1d spec) */
	#define USBPORTSC_OC 0x0400 /* Over Current condition */
	#define USBPORTSC_OCC 0x0800 /* Over Current Change R/WC */
	#define USBPORTSC_SUSP 0x1000 /* Suspend */
	#define USBPORTSC_RES2 0x2000 /* reserved, write zeroes */
	#define USBPORTSC_RES3 0x4000 /* reserved, write zeroes */
	#define USBPORTSC_RES4 0x8000 /* reserved, write zeroes */

	/* Legacy support register */
	#define USBLEGSUP 0xc0
	#define USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */
	#define USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
	#define USBLEGSUP_RO 0x5040 /* R/O and reserved bits */

	#define UHCI_PTR_BITS __constant_cpu_to_le32(0x000F)
	#define UHCI_PTR_TERM __constant_cpu_to_le32(0x0001)
	#define UHCI_PTR_QH __constant_cpu_to_le32(0x0002)
	#define UHCI_PTR_DEPTH __constant_cpu_to_le32(0x0004)
	#define UHCI_PTR_BREADTH __constant_cpu_to_le32(0x0000)

	#define UHCI_NUMFRAMES 1024 /* in the frame list [array] */
	#define UHCI_MAX_SOF_NUMBER 2047 /* in an SOF packet */
	#define CAN_SCHEDULE_FRAMES 1000 /* how far in the future frames
	* can be scheduled */

	/* When no queues need Full-Speed Bandwidth Reclamation,
	* delay this long before turning FSBR off */
	#define FSBR_OFF_DELAY msecs_to_jiffies(10)

	/* If a queue hasn't advanced after this much time, assume it is stuck */
	#define QH_WAIT_TIMEOUT msecs_to_jiffies(200)


	/*
	* Queue Headers
	*/

	/*
	* One role of a QH is to hold a queue of TDs for some endpoint. One QH goes
	* with each endpoint, and qh->element (updated by the HC) is either:
	* - the next unprocessed TD in the endpoint's queue, or
	* - UHCI_PTR_TERM (when there's no more traffic for this endpoint).
	*
	* The other role of a QH is to serve as a "skeleton" framelist entry, so we
	* can easily splice a QH for some endpoint into the schedule at the right
	* place. Then qh->element is UHCI_PTR_TERM.
	*
	* In the schedule, qh->link maintains a list of QHs seen by the HC:
	* skel1 --> ep1-qh --> ep2-qh --> ... --> skel2 --> ...
	*
	* qh->node is the software equivalent of qh->link. The differences
	* are that the software list is doubly-linked and QHs in the UNLINKING
	* state are on the software list but not the hardware schedule.
	*
	* For bookkeeping purposes we maintain QHs even for Isochronous endpoints,
	* but they never get added to the hardware schedule.
	*/
	#define QH_STATE_IDLE 1 /* QH is not being used */
	#define QH_STATE_UNLINKING 2 /* QH has been removed from the
	* schedule but the hardware may
	* still be using it */
	#define QH_STATE_ACTIVE 3 /* QH is on the schedule */

	struct uhci_qh {
	/* Hardware fields */
	__le32 link; /* Next QH in the schedule */
	__le32 element; /* Queue element (TD) pointer */

	/* Software fields */
	struct list_head node; /* Node in the list of QHs */
	struct usb_host_endpoint hep; / Endpoint information */
	struct usb_device *udev;
	struct list_head queue; /* Queue of urbps for this QH */
	struct uhci_qh skel; / Skeleton for this QH */
	struct uhci_td dummy_td; / Dummy TD to end the queue */
	struct uhci_td post_td; / Last TD completed */

	struct usb_iso_packet_descriptor *iso_packet_desc;
	/* Next urb->iso_frame_desc entry */
	unsigned long advance_jiffies; /* Time of last queue advance */
	unsigned int unlink_frame; /* When the QH was unlinked */
	unsigned int period; /* For Interrupt and Isochronous QHs */
	unsigned int iso_frame; /* Frame # for iso_packet_desc */
	int iso_status; /* Status for Isochronous URBs */

	int state; /* QH_STATE_xxx; see above */
	int type; /* Queue type (control, bulk, etc) */

	dma_addr_t dma_handle;

	unsigned int initial_toggle:1; /* Endpoint's current toggle value */
	unsigned int needs_fixup:1; /* Must fix the TD toggle values */
	unsigned int is_stopped:1; /* Queue was stopped by error/unlink */
	unsigned int wait_expired:1; /* QH_WAIT_TIMEOUT has expired */
	} __attribute__((aligned(16)));

	/*
	* We need a special accessor for the element pointer because it is
	* subject to asynchronous updates by the controller.
	*/
	static inline __le32 qh_element(struct uhci_qh *qh) {
	__le32 element = qh->element;

	barrier();
	return element;
	}


	/*
	* Transfer Descriptors
	*/

	/*
	* for TD <status>:
	*/
	#define TD_CTRL_SPD (1 << 29) /* Short Packet Detect */
	#define TD_CTRL_C_ERR_MASK (3 << 27) /* Error Counter bits */
	#define TD_CTRL_C_ERR_SHIFT 27
	#define TD_CTRL_LS (1 << 26) /* Low Speed Device */
	#define TD_CTRL_IOS (1 << 25) /* Isochronous Select */
	#define TD_CTRL_IOC (1 << 24) /* Interrupt on Complete */
	#define TD_CTRL_ACTIVE (1 << 23) /* TD Active */
	#define TD_CTRL_STALLED (1 << 22) /* TD Stalled */
	#define TD_CTRL_DBUFERR (1 << 21) /* Data Buffer Error */
	#define TD_CTRL_BABBLE (1 << 20) /* Babble Detected */
	#define TD_CTRL_NAK (1 << 19) /* NAK Received */
	#define TD_CTRL_CRCTIMEO (1 << 18) /* CRC/Time Out Error */
	#define TD_CTRL_BITSTUFF (1 << 17) /* Bit Stuff Error */
	#define TD_CTRL_ACTLEN_MASK 0x7FF /* actual length, encoded as n - 1 */

	#define TD_CTRL_ANY_ERROR (TD_CTRL_STALLED \| TD_CTRL_DBUFERR \| \
	TD_CTRL_BABBLE \| TD_CTRL_CRCTIME \| \
	TD_CTRL_BITSTUFF)

	#define uhci_maxerr(err) ((err) << TD_CTRL_C_ERR_SHIFT)
	#define uhci_status_bits(ctrl_sts) ((ctrl_sts) & 0xF60000)
	#define uhci_actual_length(ctrl_sts) (((ctrl_sts) + 1) & \
	TD_CTRL_ACTLEN_MASK) /* 1-based */

	/*
	* for TD <info>: (a.k.a. Token)
	*/
	#define td_token(td) le32_to_cpu((td)->token)
	#define TD_TOKEN_DEVADDR_SHIFT 8
	#define TD_TOKEN_TOGGLE_SHIFT 19
	#define TD_TOKEN_TOGGLE (1 << 19)
	#define TD_TOKEN_EXPLEN_SHIFT 21
	#define TD_TOKEN_EXPLEN_MASK 0x7FF /* expected length, encoded as n-1 */
	#define TD_TOKEN_PID_MASK 0xFF

	#define uhci_explen(len) ((((len) - 1) & TD_TOKEN_EXPLEN_MASK) << \
	TD_TOKEN_EXPLEN_SHIFT)

	#define uhci_expected_length(token) ((((token) >> TD_TOKEN_EXPLEN_SHIFT) + \
	1) & TD_TOKEN_EXPLEN_MASK)
	#define uhci_toggle(token) (((token) >> TD_TOKEN_TOGGLE_SHIFT) & 1)
	#define uhci_endpoint(token) (((token) >> 15) & 0xf)
	#define uhci_devaddr(token) (((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7f)
	#define uhci_devep(token) (((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7ff)
	#define uhci_packetid(token) ((token) & TD_TOKEN_PID_MASK)
	#define uhci_packetout(token) (uhci_packetid(token) != USB_PID_IN)
	#define uhci_packetin(token) (uhci_packetid(token) == USB_PID_IN)

	/*
	* The documentation says "4 words for hardware, 4 words for software".
	*
	* That's silly, the hardware doesn't care. The hardware only cares that
	* the hardware words are 16-byte aligned, and we can have any amount of
	* sw space after the TD entry.
	*
	* td->link points to either another TD (not necessarily for the same urb or
	* even the same endpoint), or nothing (PTR_TERM), or a QH.
	*/
	struct uhci_td {
	/* Hardware fields */
	__le32 link;
	__le32 status;
	__le32 token;
	__le32 buffer;

	/* Software fields */
	dma_addr_t dma_handle;

	struct list_head list;

	int frame; /* for iso: what frame? */
	struct list_head fl_list;
	} __attribute__((aligned(16)));

	/*
	* We need a special accessor for the control/status word because it is
	* subject to asynchronous updates by the controller.
	*/
	static inline u32 td_status(struct uhci_td *td) {
	__le32 status = td->status;

	barrier();
	return le32_to_cpu(status);
	}


	/*
	* Skeleton Queue Headers
	*/

	/*
	* The UHCI driver uses QHs with Interrupt, Control and Bulk URBs for
	* automatic queuing. To make it easy to insert entries into the schedule,
	* we have a skeleton of QHs for each predefined Interrupt latency,
	* low-speed control, full-speed control, bulk, and terminating QH
	* (see explanation for the terminating QH below).
	*
	* When we want to add a new QH, we add it to the end of the list for the
	* skeleton QH. For instance, the schedule list can look like this:
	*
	* skel int128 QH
	* dev 1 interrupt QH
	* dev 5 interrupt QH
	* skel int64 QH
	* skel int32 QH
	* ...
	* skel int1 QH
	* skel low-speed control QH
	* dev 5 control QH
	* skel full-speed control QH
	* skel bulk QH
	* dev 1 bulk QH
	* dev 2 bulk QH
	* skel terminating QH
	*
	* The terminating QH is used for 2 reasons:
	* - To place a terminating TD which is used to workaround a PIIX bug
	* (see Intel errata for explanation), and
	* - To loop back to the full-speed control queue for full-speed bandwidth
	* reclamation.
	*
	* There's a special skeleton QH for Isochronous QHs. It never appears
	* on the schedule, and Isochronous TDs go on the schedule before the
	* the skeleton QHs. The hardware accesses them directly rather than
	* through their QH, which is used only for bookkeeping purposes.
	* While the UHCI spec doesn't forbid the use of QHs for Isochronous,
	* it doesn't use them either. And the spec says that queues never
	* advance on an error completion status, which makes them totally
	* unsuitable for Isochronous transfers.
	*/

	#define UHCI_NUM_SKELQH 14
	#define skel_unlink_qh skelqh[0]
	#define skel_iso_qh skelqh[1]
	#define skel_int128_qh skelqh[2]
	#define skel_int64_qh skelqh[3]
	#define skel_int32_qh skelqh[4]
	#define skel_int16_qh skelqh[5]
	#define skel_int8_qh skelqh[6]
	#define skel_int4_qh skelqh[7]
	#define skel_int2_qh skelqh[8]
	#define skel_int1_qh skelqh[9]
	#define skel_ls_control_qh skelqh[10]
	#define skel_fs_control_qh skelqh[11]
	#define skel_bulk_qh skelqh[12]
	#define skel_term_qh skelqh[13]

	/* Find the skelqh entry corresponding to an interval exponent */
	#define UHCI_SKEL_INDEX(exponent) (9 - exponent)


	/*
	* The UHCI controller and root hub
	*/

	/*
	* States for the root hub:
	*
	* To prevent "bouncing" in the presence of electrical noise,
	* when there are no devices attached we delay for 1 second in the
	* RUNNING_NODEVS state before switching to the AUTO_STOPPED state.
	*
	* (Note that the AUTO_STOPPED state won't be necessary once the hub
	* driver learns to autosuspend.)
	*/
	enum uhci_rh_state {
	/* In the following states the HC must be halted.
	* These two must come first. */
	UHCI_RH_RESET,
	UHCI_RH_SUSPENDED,

	UHCI_RH_AUTO_STOPPED,
	UHCI_RH_RESUMING,

	/* In this state the HC changes from running to halted,
	* so it can legally appear either way. */
	UHCI_RH_SUSPENDING,

	/* In the following states it's an error if the HC is halted.
	* These two must come last. */
	UHCI_RH_RUNNING, /* The normal state */
	UHCI_RH_RUNNING_NODEVS, /* Running with no devices attached */
	};

	/*
	* The full UHCI controller information:
	*/
	struct uhci_hcd {

	/* debugfs */
	struct dentry *dentry;

	/* Grabbed from PCI */
	unsigned long io_addr;

	struct dma_pool *qh_pool;
	struct dma_pool *td_pool;

	struct uhci_td term_td; / Terminating TD, see UHCI bug */
	struct uhci_qh skelqh[UHCI_NUM_SKELQH]; / Skeleton QHs */
	struct uhci_qh next_qh; / Next QH to scan */

	spinlock_t lock;

	dma_addr_t frame_dma_handle; /* Hardware frame list */
	__le32 *frame;
	void *frame_cpu; / CPU's frame list */

	enum uhci_rh_state rh_state;
	unsigned long auto_stop_time; /* When to AUTO_STOP */

	unsigned int frame_number; /* As of last check */
	unsigned int is_stopped;
	#define UHCI_IS_STOPPED 9999 /* Larger than a frame # */
	unsigned int last_iso_frame; /* Frame of last scan */
	unsigned int cur_iso_frame; /* Frame for current scan */

	unsigned int scan_in_progress:1; /* Schedule scan is running */
	unsigned int need_rescan:1; /* Redo the schedule scan */
	unsigned int dead:1; /* Controller has died */
	unsigned int working_RD:1; /* Suspended root hub doesn't
	need to be polled */
	unsigned int is_initialized:1; /* Data structure is usable */
	unsigned int fsbr_is_on:1; /* FSBR is turned on */
	unsigned int fsbr_is_wanted:1; /* Does any URB want FSBR? */
	unsigned int fsbr_expiring:1; /* FSBR is timing out */

	struct timer_list fsbr_timer; /* For turning off FBSR */

	/* Support for port suspend/resume/reset */
	unsigned long port_c_suspend; /* Bit-arrays of ports */
	unsigned long resuming_ports;
	unsigned long ports_timeout; /* Time to stop signalling */

	struct list_head idle_qh_list; /* Where the idle QHs live */

	int rh_numports; /* Number of root-hub ports */

	wait_queue_head_t waitqh; /* endpoint_disable waiters */
	int num_waiting; /* Number of waiters */
	};

	/* Convert between a usb_hcd pointer and the corresponding uhci_hcd */
	static inline struct uhci_hcd hcd_to_uhci(struct usb_hcd hcd)
	{
	return (struct uhci_hcd *) (hcd->hcd_priv);
	}
	static inline struct usb_hcd uhci_to_hcd(struct uhci_hcd uhci)
	{
	return container_of((void *) uhci, struct usb_hcd, hcd_priv);
	}

	#define uhci_dev(u) (uhci_to_hcd(u)->self.controller)

	/* Utility macro for comparing frame numbers */
	#define uhci_frame_before_eq(f1, f2) (0 <= (int) ((f2) - (f1)))


	/*
	* Private per-URB data
	*/
	struct urb_priv {
	struct list_head node; /* Node in the QH's urbp list */

	struct urb *urb;

	struct uhci_qh qh; / QH for this URB */
	struct list_head td_list;

	unsigned fsbr:1; /* URB wants FSBR */
	};


	/*
	* Locking in uhci.c
	*
	* Almost everything relating to the hardware schedule and processing
	* of URBs is protected by uhci->lock. urb->status is protected by
	* urb->lock; that's the one exception.
	*
	* To prevent deadlocks, never lock uhci->lock while holding urb->lock.
	* The safe order of locking is:
	*
	* #1 uhci->lock
	* #2 urb->lock
	*/


	/* Some special IDs */

	#define PCI_VENDOR_ID_GENESYS 0x17a0
	#define PCI_DEVICE_ID_GL880S_UHCI 0x8083

	#endif