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linux/drivers/usb/host/uhci-hcd.h
Alan Stern c5e3b741a3 [PATCH] UHCI: Improve FSBR-off timing 
This patch (as707) improves the FSBR operation in uhci-hcd by turning it
off more quickly when it isn't needed.  FSBR puts a noticeable load on a
computer's PCI bus, so it should be disabled as soon as possible when it
isn't in use.  The patch leaves it running for only 10 ms after the last
URB stops using it, on the theory that this should be long enough for a
driver to submit another URB if it wants keep FSBR going.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-06-21 15:04:16 -07:00

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#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
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