[PATCH] UHCI: Remove non-iso TDs as they are used

[linux-2.6] / drivers / usb / host / uhci-hcd.h

#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 */


/*
 *      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 */
        dma_addr_t dma_handle;

        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 */

        unsigned int unlink_frame;      /* When the QH was unlinked */
        int state;                      /* QH_STATE_xxx; see above */
        int type;                       /* Queue type (control, bulk, etc) */

        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 */
} __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;
        struct list_head remove_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]

/*
 * Search tree for determining where <interval> fits in the skelqh[]
 * skeleton.
 *
 * An interrupt request should be placed into the slowest skelqh[]
 * which meets the interval/period/frequency requirement.
 * An interrupt request is allowed to be faster than <interval> but not slower.
 *
 * For a given <interval>, this function returns the appropriate/matching
 * skelqh[] index value.
 */
static inline int __interval_to_skel(int interval)
{
        if (interval < 16) {
                if (interval < 4) {
                        if (interval < 2)
                                return 9;       /* int1 for 0-1 ms */
                        return 8;               /* int2 for 2-3 ms */
                }
                if (interval < 8)
                        return 7;               /* int4 for 4-7 ms */
                return 6;                       /* int8 for 8-15 ms */
        }
        if (interval < 64) {
                if (interval < 32)
                        return 5;               /* int16 for 16-31 ms */
                return 4;                       /* int32 for 32-63 ms */
        }
        if (interval < 128)
                return 3;                       /* int64 for 64-127 ms */
        return 2;                               /* int128 for 128-255 ms (Max.) */
}


/*
 *      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 */

        int fsbr;                       /* Full-speed bandwidth reclamation */
        unsigned long fsbrtimeout;      /* FSBR delay */

        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 scan_in_progress:1;        /* Schedule scan is running */
        unsigned int need_rescan:1;             /* Redo the schedule scan */
        unsigned int hc_inaccessible:1;         /* HC is suspended or dead */
        unsigned int working_RD:1;              /* Suspended root hub doesn't
                                                   need to be polled */
        unsigned int is_initialized:1;          /* Data structure is usable */

        /* 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 */

        /* List of TDs that are done, but waiting to be freed (race) */
        struct list_head td_remove_list;
        unsigned int td_remove_age;             /* Age in frames */

        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)


/*
 *      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 turned on 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