/*      $NetBSD: bus.h,v 1.24 2025/12/11 07:25:12 andvar Exp $  */

/*
 * Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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 _NEWSMIPS_BUS_H_
#define _NEWSMIPS_BUS_H_

#include <mips/locore.h>

/*
 * Utility macros; do not use outside this file.
 */
#define __PB_TYPENAME_PREFIX(BITS)      ___CONCAT(uint,BITS)
#define __PB_TYPENAME(BITS)             ___CONCAT(__PB_TYPENAME_PREFIX(BITS),_t)

/*
 * Bus address and size types
 */
typedef u_long bus_addr_t;
typedef u_long bus_size_t;

#define PRIxBUSADDR     "lx"
#define PRIxBUSSIZE     "lx"
#define PRIuBUSSIZE     "lu"

/*
 * Access methods for bus resources and address space.
 */
typedef int     bus_space_tag_t;
typedef u_long  bus_space_handle_t;

#define PRIxBSH         "lx"

/*
 *      int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
 *          bus_size_t size, int flags, bus_space_handle_t *bshp);
 *
 * Map a region of bus space.
 */

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

int     bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t,
            int, bus_space_handle_t *);

/*
 *      void bus_space_unmap(bus_space_tag_t t,
 *           bus_space_handle_t bsh, bus_size_t size);
 *
 * Unmap a region of bus space.
 */

void    bus_space_unmap (bus_space_tag_t, bus_space_handle_t, bus_size_t);

/*
 *      int bus_space_subregion(bus_space_tag_t t,
 *          bus_space_handle_t bsh, bus_size_t offset, bus_size_t size,
 *          bus_space_handle_t *nbshp);
 *
 * Get a new handle for a subregion of an already-mapped area of bus space.
 */

int     bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
            bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp);

/*
 *      int bus_space_alloc(bus_space_tag_t t, bus_addr_t, rstart,
 *          bus_addr_t rend, bus_size_t size, bus_size_t align,
 *          bus_size_t boundary, int flags, bus_addr_t *addrp,
 *          bus_space_handle_t *bshp);
 *
 * Allocate a region of bus space.
 */

int     bus_space_alloc (bus_space_tag_t t, bus_addr_t rstart,
            bus_addr_t rend, bus_size_t size, bus_size_t align,
            bus_size_t boundary, int cacheable, bus_addr_t *addrp,
            bus_space_handle_t *bshp);

/*
 *      int bus_space_free (bus_space_tag_t t,
 *          bus_space_handle_t bsh, bus_size_t size);
 *
 * Free a region of bus space.
 */

void    bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh,
            bus_size_t size);

/*
 *      uintN_t bus_space_read_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset);
 *
 * Read a 1, 2, 4, or 8 byte quantity from bus space
 * described by tag/handle/offset.
 */

#define bus_space_read_1(t, h, o)                                       \
     ((void) t, (*(volatile uint8_t *)((h) + (o))))

#define bus_space_read_2(t, h, o)                                       \
     ((void) t, (*(volatile uint16_t *)((h) + (o))))

#define bus_space_read_4(t, h, o)                                       \
     ((void) t, (*(volatile uint32_t *)((h) + (o))))

/*
 *      void bus_space_read_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          uintN_t *addr, size_t count);
 *
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle/offset and copy into buffer provided.
 */

#define __NEWSMIPS_bus_space_read_multi(BYTES,BITS)                     \
static __inline void __CONCAT(bus_space_read_multi_,BYTES)              \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        __PB_TYPENAME(BITS) *, size_t);                                 \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_read_multi_,BYTES)(                                  \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        __PB_TYPENAME(BITS) *a,                                         \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--)                                                     \
                *a++ = __CONCAT(bus_space_read_,BYTES)(t, h, o);        \
}

__NEWSMIPS_bus_space_read_multi(1,8)
__NEWSMIPS_bus_space_read_multi(2,16)
__NEWSMIPS_bus_space_read_multi(4,32)

#undef __NEWSMIPS_bus_space_read_multi

/*
 *      void bus_space_read_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          uintN_t *addr, size_t count);
 *
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle and starting at `offset' and copy into
 * buffer provided.
 */

#define __NEWSMIPS_bus_space_read_region(BYTES,BITS)                    \
static __inline void __CONCAT(bus_space_read_region_,BYTES)             \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        __PB_TYPENAME(BITS) *, size_t);                                 \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_read_region_,BYTES)(                                 \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        __PB_TYPENAME(BITS) *a,                                         \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--) {                                                   \
                *a++ = __CONCAT(bus_space_read_,BYTES)(t, h, o);        \
                o += BYTES;                                             \
        }                                                               \
}

__NEWSMIPS_bus_space_read_region(1,8)
__NEWSMIPS_bus_space_read_region(2,16)
__NEWSMIPS_bus_space_read_region(4,32)

#undef __NEWSMIPS_bus_space_read_region

/*
 *      void bus_space_write_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          uintN_t value);
 *
 * Write the 1, 2, 4, or 8 byte value `value' to bus space
 * described by tag/handle/offset.
 */

#define bus_space_write_1(t, h, o, v)                                   \
do {                                                                    \
        (void) t;                                                       \
        *(volatile uint8_t *)((h) + (o)) = (v);                 \
} while (0)

#define bus_space_write_2(t, h, o, v)                                   \
do {                                                                    \
        (void) t;                                                       \
        *(volatile uint16_t *)((h) + (o)) = (v);                        \
} while (0)

#define bus_space_write_4(t, h, o, v)                                   \
do {                                                                    \
        (void) t;                                                       \
        *(volatile uint32_t *)((h) + (o)) = (v);                        \
} while (0)

/*
 *      void bus_space_write_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          const uintN_t *addr, size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte quantities from the buffer
 * provided to bus space described by tag/handle/offset.
 */

#define __NEWSMIPS_bus_space_write_multi(BYTES,BITS)                    \
static __inline void __CONCAT(bus_space_write_multi_,BYTES)             \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        const __PB_TYPENAME(BITS) *, size_t);                           \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_write_multi_,BYTES)(                                 \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        const __PB_TYPENAME(BITS) *a,                                   \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--)                                                     \
                __CONCAT(bus_space_write_,BYTES)(t, h, o, *a++);        \
}

__NEWSMIPS_bus_space_write_multi(1,8)
__NEWSMIPS_bus_space_write_multi(2,16)
__NEWSMIPS_bus_space_write_multi(4,32)

#undef __NEWSMIPS_bus_space_write_multi

/*
 *      void bus_space_write_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          const uintN_t *addr, size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte quantities from the buffer provided
 * to bus space described by tag/handle starting at `offset'.
 */

#define __NEWSMIPS_bus_space_write_region(BYTES,BITS)                   \
static __inline void __CONCAT(bus_space_write_region_,BYTES)            \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        const __PB_TYPENAME(BITS) *, size_t);                           \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_write_region_,BYTES)(                                \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        const __PB_TYPENAME(BITS) *a,                                   \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--) {                                                   \
                __CONCAT(bus_space_write_,BYTES)(t, h, o, *a++);        \
                o += BYTES;                                             \
        }                                                               \
}

__NEWSMIPS_bus_space_write_region(1,8)
__NEWSMIPS_bus_space_write_region(2,16)
__NEWSMIPS_bus_space_write_region(4,32)

#undef __NEWSMIPS_bus_space_write_region

/*
 *      void bus_space_set_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, uintN_t val,
 *          size_t count);
 *
 * Write the 1, 2, 4, or 8 byte value `val' to bus space described
 * by tag/handle/offset `count' times.
 */

#define __NEWSMIPS_bus_space_set_multi(BYTES,BITS)                      \
static __inline void __CONCAT(bus_space_set_multi_,BYTES)               \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        __PB_TYPENAME(BITS), size_t);                                   \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_set_multi_,BYTES)(                                   \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        __PB_TYPENAME(BITS) v,                                          \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--)                                                     \
                __CONCAT(bus_space_write_,BYTES)(t, h, o, v);           \
}

__NEWSMIPS_bus_space_set_multi(1,8)
__NEWSMIPS_bus_space_set_multi(2,16)
__NEWSMIPS_bus_space_set_multi(4,32)

#undef __NEWSMIPS_bus_space_set_multi

/*
 *      void bus_space_set_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, uintN_t val,
 *          size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte value `val' to bus space described
 * by tag/handle starting at `offset'.
 */

#define __NEWSMIPS_bus_space_set_region(BYTES,BITS)                     \
static __inline void __CONCAT(bus_space_set_region_,BYTES)              \
        (bus_space_tag_t, bus_space_handle_t, bus_size_t,               \
        __PB_TYPENAME(BITS), size_t);                                   \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_set_region_,BYTES)(                                  \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h,                                           \
        bus_size_t o,                                                   \
        __PB_TYPENAME(BITS) v,                                          \
        size_t c)                                                       \
{                                                                       \
                                                                        \
        while (c--) {                                                   \
                __CONCAT(bus_space_write_,BYTES)(t, h, o, v);           \
                o += BYTES;                                             \
        }                                                               \
}

__NEWSMIPS_bus_space_set_region(1,8)
__NEWSMIPS_bus_space_set_region(2,16)
__NEWSMIPS_bus_space_set_region(4,32)

#undef __NEWSMIPS_bus_space_set_region

/*
 *      void bus_space_copy_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh1, bus_size_t off1,
 *          bus_space_handle_t bsh2, bus_size_t off2,
 *          bus_size_t count);
 *
 * Copy `count' 1, 2, 4, or 8 byte values from bus space starting
 * at tag/bsh1/off1 to bus space starting at tag/bsh2/off2.
 */

#define __NEWSMIPS_copy_region(BYTES)                                   \
static __inline void __CONCAT(bus_space_copy_region_,BYTES)             \
        (bus_space_tag_t,                                               \
            bus_space_handle_t bsh1, bus_size_t off1,                   \
            bus_space_handle_t bsh2, bus_size_t off2,                   \
            bus_size_t count);                                          \
                                                                        \
static __inline void                                                    \
__CONCAT(bus_space_copy_region_,BYTES)(                                 \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h1,                                          \
        bus_size_t o1,                                                  \
        bus_space_handle_t h2,                                          \
        bus_size_t o2,                                                  \
        bus_size_t c)                                                   \
{                                                                       \
        bus_size_t o;                                                   \
                                                                        \
        if ((h1 + o1) >= (h2 + o2)) {                                   \
                /* src after dest: copy forward */                      \
                for (o = 0; c != 0; c--, o += BYTES)                    \
                        __CONCAT(bus_space_write_,BYTES)(t, h2, o2 + o, \
                            __CONCAT(bus_space_read_,BYTES)(t, h1, o1 + o)); \
        } else {                                                        \
                /* dest after src: copy backwards */                    \
                for (o = (c - 1) * BYTES; c != 0; c--, o -= BYTES)      \
                        __CONCAT(bus_space_write_,BYTES)(t, h2, o2 + o, \
                            __CONCAT(bus_space_read_,BYTES)(t, h1, o1 + o)); \
        }                                                               \
}

__NEWSMIPS_copy_region(1)
__NEWSMIPS_copy_region(2)
__NEWSMIPS_copy_region(4)

#undef __NEWSMIPS_copy_region

/*
 * 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);
 *
 * On the MIPS, we just flush the write buffer.
 */
#define bus_space_barrier(t, h, o, l, f)        \
        ((void)((void)(t), (void)(h), (void)(o), (void)(l), (void)(f),  \
         wbflush()))
#define BUS_SPACE_BARRIER_READ  0x01            /* force read barrier */
#define BUS_SPACE_BARRIER_WRITE 0x02            /* force write barrier */

#undef __PB_TYPENAME_PREFIX
#undef __PB_TYPENAME

#define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t)

/*
 * Flags used in various bus DMA methods.
 */
#define BUS_DMA_WAITOK          0x000   /* safe to sleep (pseudo-flag) */
#define BUS_DMA_NOWAIT          0x001   /* not safe to sleep */
#define BUS_DMA_ALLOCNOW        0x002   /* perform resource allocation now */
#define BUS_DMA_COHERENT        0x004   /* hint: map memory DMA coherent */
#define BUS_DMA_STREAMING       0x008   /* hint: sequential, unidirectional */
#define BUS_DMA_BUS1            0x010   /* placeholders for bus functions... */
#define BUS_DMA_BUS2            0x020
#define BUS_DMA_BUS3            0x040
#define BUS_DMA_BUS4            0x080
#define BUS_DMA_READ            0x100   /* mapping is device -> memory only */
#define BUS_DMA_WRITE           0x200   /* mapping is memory -> device only */
#define BUS_DMA_NOCACHE         0x400   /* hint: map non-cached memory */

#define NEWSMIPS_DMAMAP_COHERENT 0x10000 /* no cache flush necessary on sync */
#define NEWSMIPS_DMAMAP_MAPTBL  0x20000 /* use DMA mapping table */

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

/*
 * Operations performed by bus_dmamap_sync().
 */
#define BUS_DMASYNC_PREREAD     0x01    /* pre-read synchronization */
#define BUS_DMASYNC_POSTREAD    0x02    /* post-read synchronization */
#define BUS_DMASYNC_PREWRITE    0x04    /* pre-write synchronization */
#define BUS_DMASYNC_POSTWRITE   0x08    /* post-write synchronization */

typedef struct newsmips_bus_dma_tag             *bus_dma_tag_t;
typedef struct newsmips_bus_dmamap              *bus_dmamap_t;

#define BUS_DMA_TAG_VALID(t)    ((t) != (bus_dma_tag_t)0)

/*
 *      bus_dma_segment_t
 *
 *      Describes a single contiguous DMA transaction.  Values
 *      are suitable for programming into DMA registers.
 */
struct newsmips_bus_dma_segment {
        bus_addr_t      ds_addr;        /* DMA address */
        bus_size_t      ds_len;         /* length of transfer */
        bus_addr_t      _ds_vaddr;      /* virtual address, 0 if invalid */
};
typedef struct newsmips_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 newsmips_bus_dma_tag {
        /*
         * 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);
        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, void **, int);
        void    (*_dmamem_unmap)(bus_dma_tag_t, void *, size_t);
        paddr_t (*_dmamem_mmap)(bus_dma_tag_t, bus_dma_segment_t *,
                    int, off_t, int, int);

        /*
         * NEWSMIPS quirks.
         * This is NOT a constant.  Slot dependent information is
         * required to flush DMA cache correctly.
         */
        int     _slotno;
        bus_space_tag_t _slotbaset;
        bus_space_handle_t _slotbaseh;
};

#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, o, l, ops)                        \
        (*(t)->_dmamap_sync)((t), (p), (o), (l), (ops))

#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))

#define bus_dmatag_subregion(t, mna, mxa, nt, f) EOPNOTSUPP
#define bus_dmatag_destroy(t)

/*
 *      bus_dmamap_t
 *
 *      Describes a DMA mapping.
 */
struct newsmips_bus_dmamap {
        /*
         * PRIVATE MEMBERS: not for use my 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_maxmaxsegsz; /* fixed largest possible segment */
        bus_size_t      _dm_boundary;   /* don't cross this */
        int             _dm_flags;      /* misc. flags */
        int             _dm_maptbl;     /* DMA mapping table index */
        int             _dm_maptblcnt;  /* number of DMA mapping table */
        struct vmspace  *_dm_vmspace;   /* vmspace that owns the mapping */

        /*
         * PUBLIC MEMBERS: these are used by machine-independent code.
         */
        bus_size_t      dm_maxsegsz;    /* largest possible segment */
        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 */
};

#ifdef _NEWSMIPS_BUS_DMA_PRIVATE
void    newsmips_bus_dma_init(void);

int     _bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, bus_size_t,
            bus_size_t, int, bus_dmamap_t *);
void    _bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
int     _bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *,
            bus_size_t, struct proc *, int);
int     _bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t,
            struct mbuf *, int);
int     _bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t,
            struct uio *, int);
int     _bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t,
            bus_dma_segment_t *, int, bus_size_t, int);
void    _bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
void    _bus_dmamap_sync_r3k(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
            bus_size_t, int);
void    _bus_dmamap_sync_r4k(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
            bus_size_t, int);

int     _bus_dmamem_alloc(bus_dma_tag_t tag, bus_size_t size,
            bus_size_t alignment, bus_size_t boundary,
            bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags);
void    _bus_dmamem_free(bus_dma_tag_t tag, bus_dma_segment_t *segs,
            int nsegs);
int     _bus_dmamem_map(bus_dma_tag_t tag, bus_dma_segment_t *segs,
            int nsegs, size_t size, void **kvap, int flags);
void    _bus_dmamem_unmap(bus_dma_tag_t tag, void *kva,
            size_t size);
paddr_t _bus_dmamem_mmap(bus_dma_tag_t tag, bus_dma_segment_t *segs,
            int nsegs, off_t off, int prot, int flags);

int     _bus_dmamem_alloc_range(bus_dma_tag_t tag, bus_size_t size,
            bus_size_t alignment, bus_size_t boundary,
            bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags,
            vaddr_t low, vaddr_t high);

extern struct newsmips_bus_dma_tag newsmips_default_bus_dma_tag;
#endif /* _NEWSMIPS_BUS_DMA_PRIVATE */

#endif /* _NEWSMIPS_BUS_H_ */