Merge tag 'for-linus-4.12b-rc0c-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[mirror_ubuntu-bionic-kernel.git] / 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 */

/* PCI 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 */

/* PCI Intel-specific resume-enable register */
#define USBRES_INTEL            0xc4
#define   USBPORT1EN            0x01
#define   USBPORT2EN            0x02

#define UHCI_PTR_BITS(uhci)     cpu_to_hc32((uhci), 0x000F)
#define UHCI_PTR_TERM(uhci)     cpu_to_hc32((uhci), 0x0001)
#define UHCI_PTR_QH(uhci)       cpu_to_hc32((uhci), 0x0002)
#define UHCI_PTR_DEPTH(uhci)    cpu_to_hc32((uhci), 0x0004)
#define UHCI_PTR_BREADTH(uhci)  cpu_to_hc32((uhci), 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 */
#define MAX_PHASE               32      /* Periodic scheduling length */

/* 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)


/*
 * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
 * __leXX (normally) or __beXX (given UHCI_BIG_ENDIAN_DESC), depending on
 * the host controller implementation.
 *
 * To facilitate the strongest possible byte-order checking from "sparse"
 * and so on, we use __leXX unless that's not practical.
 */
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_DESC
typedef __u32 __bitwise __hc32;
typedef __u16 __bitwise __hc16;
#else
#define __hc32  __le32
#define __hc16  __le16
#endif

/*
 *      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 */
        __hc32 link;                    /* Next QH in the schedule */
        __hc32 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_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 */
        short phase;                    /* Between 0 and period-1 */
        short load;                     /* Periodic time requirement, in us */
        unsigned int iso_frame;         /* Frame # for iso_packet_desc */

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

        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 */
        unsigned int bandwidth_reserved:1;      /* Periodic bandwidth has
                                                 * been allocated */
} __attribute__((aligned(16)));

/*
 * We need a special accessor for the element pointer because it is
 * subject to asynchronous updates by the controller.
 */
#define qh_element(qh)          ACCESS_ONCE((qh)->element)

#define LINK_TO_QH(uhci, qh)    (UHCI_PTR_QH((uhci)) | \
                                cpu_to_hc32((uhci), (qh)->dma_handle))


/*
 *      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 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(uhci, td)      hc32_to_cpu((uhci), (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 */
        __hc32 link;
        __hc32 status;
        __hc32 token;
        __hc32 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.
 */
#define td_status(uhci, td)             hc32_to_cpu((uhci), \
                                                ACCESS_ONCE((td)->status))

#define LINK_TO_TD(uhci, td)            (cpu_to_hc32((uhci), (td)->dma_handle))


/*
 *      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.
 * Asynchronous QHs (low-speed control, full-speed control, and bulk)
 * go onto the period-1 interrupt list, since they all get accessed on
 * every frame.
 *
 * When we want to add a new QH, we add it to the list starting from the
 * appropriate skeleton QH.  For instance, the schedule can look like this:
 *
 * skel int128 QH
 * dev 1 interrupt QH
 * dev 5 interrupt QH
 * skel int64 QH
 * skel int32 QH
 * ...
 * skel int1 + async QH
 * dev 5 low-speed control QH
 * dev 1 bulk QH
 * dev 2 bulk QH
 *
 * There is a special terminating QH used to keep full-speed bandwidth
 * reclamation active when no full-speed control or bulk QHs are linked
 * into the schedule.  It has an inactive TD (to work around a PIIX bug,
 * see the Intel errata) and it points back to itself.
 *
 * There's a special skeleton QH for Isochronous QHs which never appears
 * on the schedule.  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.
 *
 * There's also a special skeleton QH used for QHs which are in the process
 * of unlinking and so may still be in use by the hardware.  It too never
 * appears on the schedule.
 */

#define UHCI_NUM_SKELQH         11
#define SKEL_UNLINK             0
#define skel_unlink_qh          skelqh[SKEL_UNLINK]
#define SKEL_ISO                1
#define skel_iso_qh             skelqh[SKEL_ISO]
        /* int128, int64, ..., int1 = 2, 3, ..., 9 */
#define SKEL_INDEX(exponent)    (9 - exponent)
#define SKEL_ASYNC              9
#define skel_async_qh           skelqh[SKEL_ASYNC]
#define SKEL_TERM               10
#define skel_term_qh            skelqh[SKEL_TERM]

/* The following entries refer to sublists of skel_async_qh */
#define SKEL_LS_CONTROL         20
#define SKEL_FS_CONTROL         21
#define SKEL_FSBR               SKEL_FS_CONTROL
#define SKEL_BULK               22

/*
 *      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;

        /* Used when registers are memory mapped */
        void __iomem *regs;

        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 */
        __hc32 *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 RD_enable:1;               /* Suspended root hub with
                                                   Resume-Detect interrupts
                                                   enabled */
        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 */

        /* Silicon quirks */
        unsigned int oc_low:1;                  /* OverCurrent bit active low */
        unsigned int wait_for_hp:1;             /* Wait for HP port reset */
        unsigned int big_endian_mmio:1;         /* Big endian registers */
        unsigned int big_endian_desc:1;         /* Big endian descriptors */

        /* 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 */

        int total_load;                         /* Sum of array values */
        short load[MAX_PHASE];                  /* Periodic allocations */

        /* Reset host controller */
        void    (*reset_hc) (struct uhci_hcd *uhci);
        int     (*check_and_reset_hc) (struct uhci_hcd *uhci);
        /* configure_hc should perform arch specific settings, if needed */
        void    (*configure_hc) (struct uhci_hcd *uhci);
        /* Check for broken resume detect interrupts */
        int     (*resume_detect_interrupts_are_broken) (struct uhci_hcd *uhci);
        /* Check for broken global suspend */
        int     (*global_suspend_mode_is_broken) (struct uhci_hcd *uhci);
};

/* 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 */
};


/* Some special IDs */

#define PCI_VENDOR_ID_GENESYS           0x17a0
#define PCI_DEVICE_ID_GL880S_UHCI       0x8083

/*
 * Functions used to access controller registers. The UCHI spec says that host
 * controller I/O registers are mapped into PCI I/O space. For non-PCI hosts
 * we use memory mapped registers.
 */

#ifndef CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC
/* Support PCI only */
static inline u32 uhci_readl(const struct uhci_hcd *uhci, int reg)
{
        return inl(uhci->io_addr + reg);
}

static inline void uhci_writel(const struct uhci_hcd *uhci, u32 val, int reg)
{
        outl(val, uhci->io_addr + reg);
}

static inline u16 uhci_readw(const struct uhci_hcd *uhci, int reg)
{
        return inw(uhci->io_addr + reg);
}

static inline void uhci_writew(const struct uhci_hcd *uhci, u16 val, int reg)
{
        outw(val, uhci->io_addr + reg);
}

static inline u8 uhci_readb(const struct uhci_hcd *uhci, int reg)
{
        return inb(uhci->io_addr + reg);
}

static inline void uhci_writeb(const struct uhci_hcd *uhci, u8 val, int reg)
{
        outb(val, uhci->io_addr + reg);
}

#else
/* Support non-PCI host controllers */
#ifdef CONFIG_USB_PCI
/* Support PCI and non-PCI host controllers */
#define uhci_has_pci_registers(u)       ((u)->io_addr != 0)
#else
/* Support non-PCI host controllers only */
#define uhci_has_pci_registers(u)       0
#endif

#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
/* Support (non-PCI) big endian host controllers */
#define uhci_big_endian_mmio(u)         ((u)->big_endian_mmio)
#else
#define uhci_big_endian_mmio(u)         0
#endif

static inline u32 uhci_readl(const struct uhci_hcd *uhci, int reg)
{
        if (uhci_has_pci_registers(uhci))
                return inl(uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                return readl_be(uhci->regs + reg);
#endif
        else
                return readl(uhci->regs + reg);
}

static inline void uhci_writel(const struct uhci_hcd *uhci, u32 val, int reg)
{
        if (uhci_has_pci_registers(uhci))
                outl(val, uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                writel_be(val, uhci->regs + reg);
#endif
        else
                writel(val, uhci->regs + reg);
}

static inline u16 uhci_readw(const struct uhci_hcd *uhci, int reg)
{
        if (uhci_has_pci_registers(uhci))
                return inw(uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                return readw_be(uhci->regs + reg);
#endif
        else
                return readw(uhci->regs + reg);
}

static inline void uhci_writew(const struct uhci_hcd *uhci, u16 val, int reg)
{
        if (uhci_has_pci_registers(uhci))
                outw(val, uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                writew_be(val, uhci->regs + reg);
#endif
        else
                writew(val, uhci->regs + reg);
}

static inline u8 uhci_readb(const struct uhci_hcd *uhci, int reg)
{
        if (uhci_has_pci_registers(uhci))
                return inb(uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                return readb_be(uhci->regs + reg);
#endif
        else
                return readb(uhci->regs + reg);
}

static inline void uhci_writeb(const struct uhci_hcd *uhci, u8 val, int reg)
{
        if (uhci_has_pci_registers(uhci))
                outb(val, uhci->io_addr + reg);
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_MMIO
        else if (uhci_big_endian_mmio(uhci))
                writeb_be(val, uhci->regs + reg);
#endif
        else
                writeb(val, uhci->regs + reg);
}
#endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */

/*
 * The GRLIB GRUSBHC controller can use big endian format for its descriptors.
 *
 * UHCI controllers accessed through PCI work normally (little-endian
 * everywhere), so we don't bother supporting a BE-only mode.
 */
#ifdef CONFIG_USB_UHCI_BIG_ENDIAN_DESC
#define uhci_big_endian_desc(u)         ((u)->big_endian_desc)

/* cpu to uhci */
static inline __hc32 cpu_to_hc32(const struct uhci_hcd *uhci, const u32 x)
{
        return uhci_big_endian_desc(uhci)
                ? (__force __hc32)cpu_to_be32(x)
                : (__force __hc32)cpu_to_le32(x);
}

/* uhci to cpu */
static inline u32 hc32_to_cpu(const struct uhci_hcd *uhci, const __hc32 x)
{
        return uhci_big_endian_desc(uhci)
                ? be32_to_cpu((__force __be32)x)
                : le32_to_cpu((__force __le32)x);
}

#else
/* cpu to uhci */
static inline __hc32 cpu_to_hc32(const struct uhci_hcd *uhci, const u32 x)
{
        return cpu_to_le32(x);
}

/* uhci to cpu */
static inline u32 hc32_to_cpu(const struct uhci_hcd *uhci, const __hc32 x)
{
        return le32_to_cpu(x);
}
#endif

#endif