/* $OpenBSD: bus.h,v 1.5 2020/11/15 23:13:00 kettenis Exp $ */
/*
 * Copyright (c) 2003-2004 Opsycon AB Sweden.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _MACHINE_BUS_H_
#define _MACHINE_BUS_H_

#define CAT(a,b)        a##b
#define CAT3(a,b,c)     a##b##c

/*
 * Bus access types.
 */
struct bus_space;
typedef u_long bus_addr_t;
typedef u_long bus_size_t;
typedef u_long bus_space_handle_t;
typedef struct bus_space *bus_space_tag_t;
typedef struct bus_space bus_space_t;

struct bus_space {
        bus_addr_t      bus_base;
        void            *bus_private;
        uint8_t         (*_space_read_1)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t);
        void            (*_space_write_1)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t, uint8_t);
        uint16_t        (*_space_read_2)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t);
        void            (*_space_write_2)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t, uint16_t);
        uint32_t        (*_space_read_4)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t);
        void            (*_space_write_4)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t, uint32_t);
        uint64_t        (*_space_read_8)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t);
        void            (*_space_write_8)(bus_space_tag_t , bus_space_handle_t,
                          bus_size_t, uint64_t);
        void            (*_space_read_raw_2)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, uint8_t *, bus_size_t);
        void            (*_space_write_raw_2)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, const uint8_t *, bus_size_t);
        void            (*_space_read_raw_4)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, uint8_t *, bus_size_t);
        void            (*_space_write_raw_4)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, const uint8_t *, bus_size_t);
        void            (*_space_read_raw_8)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, uint8_t *, bus_size_t);
        void            (*_space_write_raw_8)(bus_space_tag_t, bus_space_handle_t,
                          bus_addr_t, const uint8_t *, bus_size_t);
        int             (*_space_map)(bus_space_tag_t , bus_addr_t,
                          bus_size_t, int, bus_space_handle_t *);
        void            (*_space_unmap)(bus_space_tag_t, bus_space_handle_t,
                          bus_size_t);
        int             (*_space_subregion)(bus_space_tag_t, bus_space_handle_t,
                          bus_size_t, bus_size_t, bus_space_handle_t *);
        void *          (*_space_vaddr)(bus_space_tag_t, bus_space_handle_t);
        paddr_t         (*_space_mmap)(bus_space_tag_t, bus_addr_t, off_t,
                          int, int);
};

#define bus_space_read_1(t, h, o) (*(t)->_space_read_1)((t), (h), (o))
#define bus_space_read_2(t, h, o) (*(t)->_space_read_2)((t), (h), (o))
#define bus_space_read_4(t, h, o) (*(t)->_space_read_4)((t), (h), (o))
#define bus_space_read_8(t, h, o) (*(t)->_space_read_8)((t), (h), (o))

#define bus_space_write_1(t, h, o, v) (*(t)->_space_write_1)((t), (h), (o), (v))
#define bus_space_write_2(t, h, o, v) (*(t)->_space_write_2)((t), (h), (o), (v))
#define bus_space_write_4(t, h, o, v) (*(t)->_space_write_4)((t), (h), (o), (v))
#define bus_space_write_8(t, h, o, v) (*(t)->_space_write_8)((t), (h), (o), (v))

#define bus_space_read_raw_2(t, h, o) \
        generic_space_read_2((t), (h), (o))
#define bus_space_read_raw_4(t, h, o) \
        generic_space_read_4((t), (h), (o))
#define bus_space_read_raw_8(t, h, o) \
        generic_space_read_8((t), (h), (o))

#define bus_space_write_raw_2(t, h, o, v) \
        generic_space_write_2((t), (h), (o), (v))
#define bus_space_write_raw_4(t, h, o, v) \
        generic_space_write_4((t), (h), (o), (v))
#define bus_space_write_raw_8(t, h, o, v) \
        generic_space_write_8((t), (h), (o), (v))

#define bus_space_read_raw_multi_2(t, h, a, b, l) \
        (*(t)->_space_read_raw_2)((t), (h), (a), (b), (l))
#define bus_space_read_raw_multi_4(t, h, a, b, l) \
        (*(t)->_space_read_raw_4)((t), (h), (a), (b), (l))
#define bus_space_read_raw_multi_8(t, h, a, b, l) \
        (*(t)->_space_read_raw_8)((t), (h), (a), (b), (l))

#define bus_space_write_raw_multi_2(t, h, a, b, l) \
        (*(t)->_space_write_raw_2)((t), (h), (a), (b), (l))
#define bus_space_write_raw_multi_4(t, h, a, b, l) \
        (*(t)->_space_write_raw_4)((t), (h), (a), (b), (l))
#define bus_space_write_raw_multi_8(t, h, a, b, l) \
        (*(t)->_space_write_raw_8)((t), (h), (a), (b), (l))

#define bus_space_map(t, o, s, c, p) (*(t)->_space_map)((t), (o), (s), (c), (p))
#define bus_space_unmap(t, h, s) (*(t)->_space_unmap)((t), (h), (s))
#define bus_space_subregion(t, h, o, s, p) \
    (*(t)->_space_subregion)((t), (h), (o), (s), (p))

#define BUS_SPACE_MAP_CACHEABLE         0x01
#define BUS_SPACE_MAP_KSEG0             0x02
#define BUS_SPACE_MAP_LINEAR            0x04
#define BUS_SPACE_MAP_PREFETCHABLE      0x08

#define bus_space_vaddr(t, h)   (*(t)->_space_vaddr)((t), (h))
#define bus_space_mmap(t, a, o, p, f) \
    (*(t)->_space_mmap)((t), (a), (o), (p), (f))

/*----------------------------------------------------------------------------*/
#define bus_space_read_multi(n,m)                                             \
static __inline void                                                          \
CAT(bus_space_read_multi_,n)(bus_space_tag_t bst, bus_space_handle_t bsh,     \
     bus_size_t o, CAT3(uint,m,_t) *x, size_t cnt)                            \
{                                                                             \
        while (cnt--)                                                         \
                *x++ = CAT(bus_space_read_,n)(bst, bsh, o);                   \
}

bus_space_read_multi(1,8)
bus_space_read_multi(2,16)
bus_space_read_multi(4,32)
bus_space_read_multi(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_read_region(n,m)                                            \
static __inline void                                                          \
CAT(bus_space_read_region_,n)(bus_space_tag_t bst, bus_space_handle_t bsh,    \
     bus_addr_t ba, CAT3(uint,m,_t) *x, size_t cnt)                           \
{                                                                             \
        while (cnt--) {                                                       \
                *x++ = CAT(bus_space_read_,n)(bst, bsh, ba);                  \
                ba += (n);                                                    \
        }                                                                     \
}

bus_space_read_region(1,8)
bus_space_read_region(2,16)
bus_space_read_region(4,32)
bus_space_read_region(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_read_raw_region(n,m)                                        \
static __inline void                                                          \
CAT(bus_space_read_raw_region_,n)(bus_space_tag_t bst,                        \
     bus_space_handle_t bsh,                                                  \
     bus_addr_t ba, uint8_t *x, size_t cnt)                                   \
{                                                                             \
        cnt >>= ((n) >> 1);                                                   \
        while (cnt--) {                                                       \
                CAT(bus_space_read_raw_multi_,n)(bst, bsh, ba, x, (n));       \
                ba += (n);                                                    \
                x += (n);                                                     \
        }                                                                     \
}

bus_space_read_raw_region(2,16)
bus_space_read_raw_region(4,32)
bus_space_read_raw_region(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_write_multi(n,m)                                            \
static __inline void                                                          \
CAT(bus_space_write_multi_,n)(bus_space_tag_t bst, bus_space_handle_t bsh,    \
     bus_size_t o, const CAT3(uint,m,_t) *x, size_t cnt)                      \
{                                                                             \
        while (cnt--)                                                         \
                CAT(bus_space_write_,n)(bst, bsh, o, *x++);                   \
}

bus_space_write_multi(1,8)
bus_space_write_multi(2,16)
bus_space_write_multi(4,32)
bus_space_write_multi(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_write_region(n,m)                                           \
static __inline void                                                          \
CAT(bus_space_write_region_,n)(bus_space_tag_t bst, bus_space_handle_t bsh,   \
     bus_addr_t ba, const CAT3(uint,m,_t) *x, size_t cnt)                     \
{                                                                             \
        while (cnt--) {                                                       \
                CAT(bus_space_write_,n)(bst, bsh, ba, *x++);                  \
                ba += (n);                                                    \
        }                                                                     \
}

bus_space_write_region(1,8)
bus_space_write_region(2,16)
bus_space_write_region(4,32)
bus_space_write_region(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_write_raw_region(n,m)                                       \
static __inline void                                                          \
CAT(bus_space_write_raw_region_,n)(bus_space_tag_t bst,                       \
     bus_space_handle_t bsh,                                                  \
     bus_addr_t ba, const uint8_t *x, size_t cnt)                             \
{                                                                             \
        cnt >>= ((n) >> 1);                                                   \
        while (cnt--) {                                                       \
                CAT(bus_space_write_raw_multi_,n)(bst, bsh, ba, x, (n));      \
                ba += (n);                                                    \
                x += (n);                                                     \
        }                                                                     \
}

bus_space_write_raw_region(2,16)
bus_space_write_raw_region(4,32)
bus_space_write_raw_region(8,64)

/*----------------------------------------------------------------------------*/
#define bus_space_set_region(n,m)                                             \
static __inline void                                                          \
CAT(bus_space_set_region_,n)(bus_space_tag_t bst, bus_space_handle_t bsh,     \
     bus_addr_t ba, CAT3(uint,m,_t) x, size_t cnt)                            \
{                                                                             \
        while (cnt--) {                                                       \
                CAT(bus_space_write_,n)(bst, bsh, ba, x);                     \
                ba += (n);                                                    \
        }                                                                     \
}

bus_space_set_region(1,8)
bus_space_set_region(2,16)
bus_space_set_region(4,32)
bus_space_set_region(8,64)

/*----------------------------------------------------------------------------*/
static __inline void
bus_space_copy_1(void *v, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, bus_size_t c)
{
        char *s = (char *)(h1 + o1);
        char *d = (char *)(h2 + o2);

        while (c--)
                *d++ = *s++;
}


static __inline void
bus_space_copy_2(void *v, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, bus_size_t c)
{
        short *s = (short *)(h1 + o1);
        short *d = (short *)(h2 + o2);

        while (c--)
                *d++ = *s++;
}

static __inline void
bus_space_copy_4(void *v, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, bus_size_t c)
{
        int *s = (int *)(h1 + o1);
        int *d = (int *)(h2 + o2);

        while (c--)
                *d++ = *s++;
}

static __inline void
bus_space_copy_8(void *v, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, bus_size_t c)
{
        int64_t *s = (int64_t *)(h1 + o1);
        int64_t *d = (int64_t *)(h2 + o2);

        while (c--)
                *d++ = *s++;
}

/*----------------------------------------------------------------------------*/
/*
 * Bus read/write barrier methods.
 *
 *      void bus_space_barrier(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          bus_size_t len, int flags);
 *
 */
static inline void
bus_space_barrier(bus_space_tag_t t, bus_space_handle_t h, bus_size_t offset,
    bus_size_t length, int flags)
{
        __asm__ volatile ("eieio" ::: "memory");
}
#define BUS_SPACE_BARRIER_READ  0x01            /* force read barrier */
#define BUS_SPACE_BARRIER_WRITE 0x02            /* force write barrier */

#define BUS_DMA_WAITOK          0x0000
#define BUS_DMA_NOWAIT          0x0001
#define BUS_DMA_ALLOCNOW        0x0002
#define BUS_DMA_COHERENT        0x0008
#define BUS_DMA_BUS1            0x0010  /* placeholders for bus functions... */
#define BUS_DMA_BUS2            0x0020
#define BUS_DMA_BUS3            0x0040
#define BUS_DMA_BUS4            0x0080
#define BUS_DMA_READ            0x0100  /* mapping is device -> memory only */
#define BUS_DMA_WRITE           0x0200  /* mapping is memory -> device only */
#define BUS_DMA_STREAMING       0x0400  /* hint: sequential, unidirectional */
#define BUS_DMA_ZERO            0x0800  /* zero memory in dmamem_alloc */
#define BUS_DMA_NOCACHE         0x1000
#define BUS_DMA_64BIT           0x2000  /* device handles 64bit dva */

/* Forwards needed by prototypes below. */
struct mbuf;
struct proc;
struct uio;

#define BUS_DMASYNC_POSTREAD    0x0001
#define BUS_DMASYNC_POSTWRITE   0x0002
#define BUS_DMASYNC_PREREAD     0x0004
#define BUS_DMASYNC_PREWRITE    0x0008

typedef struct machine_bus_dma_tag      *bus_dma_tag_t;
typedef struct machine_bus_dmamap       *bus_dmamap_t;

/*
 *      bus_dma_segment_t
 *
 *      Describes a single contiguous DMA transaction.  Values
 *      are suitable for programming into DMA registers.
 */
struct machine_bus_dma_segment {
        bus_addr_t      ds_addr;        /* DMA address */
        bus_size_t      ds_len;         /* length of transfer */

        paddr_t         _ds_paddr;      /* CPU address */
        vaddr_t         _ds_vaddr;      /* CPU address */
};
typedef struct machine_bus_dma_segment  bus_dma_segment_t;

/*
 *      bus_dma_tag_t
 *
 *      A machine-dependent opaque type describing the implementation of
 *      DMA for a given bus.
 */

struct machine_bus_dma_tag {
        void    *_cookie;               /* cookie used in the guts */
        int     _flags;                 /* misc. flags */

        /*
         * DMA mapping methods.
         */
        int     (*_dmamap_create)(bus_dma_tag_t , bus_size_t, int,
                    bus_size_t, bus_size_t, int, bus_dmamap_t *);
        void    (*_dmamap_destroy)(bus_dma_tag_t , bus_dmamap_t);
        int     (*_dmamap_load)(bus_dma_tag_t , bus_dmamap_t, void *,
                    bus_size_t, struct proc *, int);
        int     (*_dmamap_load_mbuf)(bus_dma_tag_t , bus_dmamap_t,
                    struct mbuf *, int);
        int     (*_dmamap_load_uio)(bus_dma_tag_t , bus_dmamap_t,
                    struct uio *, int);
        int     (*_dmamap_load_raw)(bus_dma_tag_t , bus_dmamap_t,
                    bus_dma_segment_t *, int, bus_size_t, int);
        int     (*_dmamap_load_buffer)(bus_dma_tag_t, bus_dmamap_t, void *,
                    bus_size_t, struct proc *, int, paddr_t *, int *, int);
        void    (*_dmamap_unload)(bus_dma_tag_t , bus_dmamap_t);
        void    (*_dmamap_sync)(bus_dma_tag_t , bus_dmamap_t,
                    bus_addr_t, bus_size_t, int);

        /*
         * DMA memory utility functions.
         */
        int     (*_dmamem_alloc)(bus_dma_tag_t, bus_size_t, bus_size_t,
                    bus_size_t, bus_dma_segment_t *, int, int *, int);
        void    (*_dmamem_free)(bus_dma_tag_t, bus_dma_segment_t *, int);
        int     (*_dmamem_map)(bus_dma_tag_t, bus_dma_segment_t *,
                    int, size_t, caddr_t *, int);
        void    (*_dmamem_unmap)(bus_dma_tag_t, caddr_t, size_t);
        paddr_t (*_dmamem_mmap)(bus_dma_tag_t, bus_dma_segment_t *,
                    int, off_t, int, int);

        /*
         * internal memory address translation information.
         */
        bus_addr_t _dma_mask;
};

#define bus_dmamap_create(t, s, n, m, b, f, p)                  \
        (*(t)->_dmamap_create)((t), (s), (n), (m), (b), (f), (p))
#define bus_dmamap_destroy(t, p)                                \
        (*(t)->_dmamap_destroy)((t), (p))
#define bus_dmamap_load(t, m, b, s, p, f)                       \
        (*(t)->_dmamap_load)((t), (m), (b), (s), (p), (f))
#define bus_dmamap_load_mbuf(t, m, b, f)                        \
        (*(t)->_dmamap_load_mbuf)((t), (m), (b), (f))
#define bus_dmamap_load_uio(t, m, u, f)                         \
        (*(t)->_dmamap_load_uio)((t), (m), (u), (f))
#define bus_dmamap_load_raw(t, m, sg, n, s, f)                  \
        (*(t)->_dmamap_load_raw)((t), (m), (sg), (n), (s), (f))
#define bus_dmamap_unload(t, p)                                 \
        (*(t)->_dmamap_unload)((t), (p))
#define bus_dmamap_sync(t, p, a, l, o)                          \
        (void)((t)->_dmamap_sync ?                              \
            (*(t)->_dmamap_sync)((t), (p), (a), (l), (o)) : (void)0)

#define bus_dmamem_alloc(t, s, a, b, sg, n, r, f)               \
        (*(t)->_dmamem_alloc)((t), (s), (a), (b), (sg), (n), (r), (f))
#define bus_dmamem_free(t, sg, n)                               \
        (*(t)->_dmamem_free)((t), (sg), (n))
#define bus_dmamem_map(t, sg, n, s, k, f)                       \
        (*(t)->_dmamem_map)((t), (sg), (n), (s), (k), (f))
#define bus_dmamem_unmap(t, k, s)                               \
        (*(t)->_dmamem_unmap)((t), (k), (s))
#define bus_dmamem_mmap(t, sg, n, o, p, f)                      \
        (*(t)->_dmamem_mmap)((t), (sg), (n), (o), (p), (f))

int     _dmamap_create(bus_dma_tag_t, bus_size_t, int,
            bus_size_t, bus_size_t, int, bus_dmamap_t *);
void    _dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
int     _dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *,
            bus_size_t, struct proc *, int);
int     _dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int);
int     _dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, struct uio *, int);
int     _dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t,
            bus_dma_segment_t *, int, bus_size_t, int);
int     _dmamap_load_buffer(bus_dma_tag_t, bus_dmamap_t, void *,
            bus_size_t, struct proc *, int, paddr_t *, int *, int);
void    _dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
void    _dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
            bus_size_t, int);

int     _dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t,
            bus_size_t, bus_dma_segment_t *, int, int *, int);
void    _dmamem_free(bus_dma_tag_t, bus_dma_segment_t *, int);
int     _dmamem_map(bus_dma_tag_t, bus_dma_segment_t *,
            int, size_t, caddr_t *, int);
void    _dmamem_unmap(bus_dma_tag_t, caddr_t, size_t);
paddr_t _dmamem_mmap(bus_dma_tag_t, bus_dma_segment_t *, int, off_t, int, int);
int     _dmamem_alloc_range(bus_dma_tag_t, bus_size_t, bus_size_t, bus_size_t,
            bus_dma_segment_t *, int, int *, int, paddr_t, paddr_t);

/*
 *      bus_dmamap_t
 *
 *      Describes a DMA mapping.
 */
struct machine_bus_dmamap {
        /*
         * PRIVATE MEMBERS: not for use by machine-independent code.
         */
        bus_size_t      _dm_size;       /* largest DMA transfer mappable */
        int             _dm_segcnt;     /* number of segs this map can map */
        bus_size_t      _dm_maxsegsz;   /* largest possible segment */
        bus_size_t      _dm_boundary;   /* don't cross this */
        int             _dm_flags;      /* misc. flags */

        void            *_dm_cookie;    /* cookie for bus-specific functions */

        /*
         * PUBLIC MEMBERS: these are used by machine-independent code.
         */
        bus_size_t      dm_mapsize;     /* size of the mapping */
        int             dm_nsegs;       /* # valid segments in mapping */
        bus_dma_segment_t dm_segs[1];   /* segments; variable length */
};

int     generic_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int,
            bus_space_handle_t *);
void    generic_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t);
int     generic_space_region(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            bus_size_t, bus_space_handle_t *);
void    *generic_space_vaddr(bus_space_tag_t, bus_space_handle_t);
paddr_t generic_space_mmap(bus_space_tag_t, bus_addr_t, off_t, int, int);
uint8_t generic_space_read_1(bus_space_tag_t, bus_space_handle_t, bus_size_t);
uint16_t generic_space_read_2(bus_space_tag_t, bus_space_handle_t, bus_size_t);
uint32_t generic_space_read_4(bus_space_tag_t, bus_space_handle_t, bus_size_t);
uint64_t generic_space_read_8(bus_space_tag_t, bus_space_handle_t, bus_size_t);
void    generic_space_write_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint8_t);
void    generic_space_write_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint16_t);
void    generic_space_write_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint32_t);
void    generic_space_write_8(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint64_t);
void    generic_space_read_raw_2(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, uint8_t *, bus_size_t);
void    generic_space_write_raw_2(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, const uint8_t *, bus_size_t);
void    generic_space_read_raw_4(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, uint8_t *, bus_size_t);
void    generic_space_write_raw_4(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, const uint8_t *, bus_size_t);
void    generic_space_read_raw_8(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, uint8_t *, bus_size_t);
void    generic_space_write_raw_8(bus_space_tag_t, bus_space_handle_t,
            bus_addr_t, const uint8_t *, bus_size_t);

uint16_t little_space_read_2(bus_space_tag_t, bus_space_handle_t, bus_size_t);
uint32_t little_space_read_4(bus_space_tag_t, bus_space_handle_t, bus_size_t);
uint64_t little_space_read_8(bus_space_tag_t, bus_space_handle_t, bus_size_t);
void    little_space_write_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint16_t);
void    little_space_write_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint32_t);
void    little_space_write_8(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint64_t);

#endif /* _MACHINE_BUS_H_ */