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[netbsd-mini2440.git] / sys / arch / vax / include / bus.h

/*      $NetBSD: bus.h,v 1.30 2008/03/11 05:34:02 matt 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.
 */

/*
 * Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1996 Christopher G. Demetriou.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * 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 _VAX_BUS_H_
#define _VAX_BUS_H_

#ifdef BUS_SPACE_DEBUG
#include <sys/systm.h> /* for printf() prototype */
/*
 * Macros for sanity-checking the aligned-ness of pointers passed to
 * bus space ops.  These are not strictly necessary on the VAX, but
 * could lead to performance improvements, and help catch problems
 * with drivers that would creep up on other architectures.
 */
#define __BUS_SPACE_ALIGNED_ADDRESS(p, t)                               \
        ((((u_long)(p)) & (sizeof(t)-1)) == 0)

#define __BUS_SPACE_ADDRESS_SANITY(p, t, d)                             \
({                                                                      \
        if (__BUS_SPACE_ALIGNED_ADDRESS((p), t) == 0) {                 \
                printf("%s 0x%lx not aligned to %d bytes %s:%d\n",      \
                    d, (u_long)(p), sizeof(t), __FILE__, __LINE__);     \
        }                                                               \
        (void) 0;                                                       \
})

#define BUS_SPACE_ALIGNED_POINTER(p, t) __BUS_SPACE_ALIGNED_ADDRESS(p, t)
#else
#define __BUS_SPACE_ADDRESS_SANITY(p,t,d)       (void) 0
#define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t)
#endif /* BUS_SPACE_DEBUG */

/*
 * Bus address and size types
 */
typedef paddr_t bus_addr_t;
typedef psize_t bus_size_t;

/*
 * Access methods for bus resources and address space.
 */
typedef struct vax_bus_space *bus_space_tag_t;
typedef vaddr_t bus_space_handle_t;

struct vax_bus_space {
        /* cookie */
        void            *vbs_cookie;

        /* mapping/unmapping */
        int             (*vbs_map)(void *, bus_addr_t, bus_size_t, int,
                            bus_space_handle_t *, int);
        void            (*vbs_unmap)(void *, bus_space_handle_t, bus_size_t,
                            int);
        int             (*vbs_subregion)(void *, bus_space_handle_t, bus_size_t,
                            bus_size_t, bus_space_handle_t *);

        /* allocation/deallocation */
        int             (*vbs_alloc)(void *, bus_addr_t, bus_addr_t, bus_size_t,
                            bus_size_t, bus_size_t, int, bus_addr_t *,
                            bus_space_handle_t *);
        void            (*vbs_free)(void *, bus_space_handle_t, bus_size_t);
        /* mmap bus space for user */
        paddr_t         (*vbs_mmap)(void *, bus_addr_t, off_t, int, int);
};

/*
 *      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

#define bus_space_map(t, a, s, f, hp)                                   \
        (*(t)->vbs_map)((t)->vbs_cookie, (a), (s), (f), (hp), 1)
#define vax_bus_space_map_noacct(t, a, s, f, hp)                        \
        (*(t)->vbs_map)((t)->vbs_cookie, (a), (s), (f), (hp), 0)

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

#define bus_space_unmap(t, h, s)                                        \
        (*(t)->vbs_unmap)((t)->vbs_cookie, (h), (s), 1)
#define vax_bus_space_unmap_noacct(t, h, s)                             \
        (*(t)->vbs_unmap)((t)->vbs_cookie, (h), (s), 0)

/*
 *      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.
 */

#define bus_space_subregion(t, h, o, s, nhp)                            \
        (*(t)->vbs_subregion)((t)->vbs_cookie, (h), (o), (s), (nhp))

/*
 *      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.
 */

#define bus_space_alloc(t, rs, re, s, a, b, f, ap, hp)                  \
        (*(t)->vbs_alloc)((t)->vbs_cookie, (rs), (re), (s), (a), (b),   \
            (f), (ap), (hp))

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

#define bus_space_free(t, h, s)                                         \
        (*(t)->vbs_free)((t)->vbs_cookie, (h), (s))

/*
 * Mmap bus space for a user application.
 */
#define bus_space_mmap(t, a, o, p, f)                                   \
        (*(t)->vbs_mmap)((t)->vbs_cookie, (a), (o), (p), (f))


/*
 *      u_intN_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)                                       \
            (*(volatile uint8_t *)((h) + (o)))

#define bus_space_read_2(t, h, o)                                       \
         (__BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr"),  \
            (*(volatile uint16_t *)((h) + (o))))

#define bus_space_read_4(t, h, o)                                       \
         (__BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr"),  \
            (*(volatile uint32_t *)((h) + (o))))

#if 0   /* Cause a link error for bus_space_read_8 */
#define bus_space_read_8(t, h, o)       !!! bus_space_read_8 unimplemented !!!
#endif

/*
 *      void bus_space_read_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          u_intN_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.
 */
static __inline void
        vax_mem_read_multi_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint8_t *, size_t),
        vax_mem_read_multi_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint16_t *, size_t),
        vax_mem_read_multi_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint32_t *, size_t);

#define bus_space_read_multi_1(t, h, o, a, c)                           \
        vax_mem_read_multi_1((t), (h), (o), (a), (c))

#define bus_space_read_multi_2(t, h, o, a, c)                           \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint16_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_read_multi_2((t), (h), (o), (a), (c));          \
} while (0)

#define bus_space_read_multi_4(t, h, o, a, c)                           \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint32_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_read_multi_4((t), (h), (o), (a), (c));          \
} while (0)

#if 0   /* Cause a link error for bus_space_read_multi_8 */
#define bus_space_read_multi_8  !!! bus_space_read_multi_8 unimplemented !!!
#endif

static __inline void
vax_mem_read_multi_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint8_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *a = *(volatile uint8_t *)(addr);
}

static __inline void
vax_mem_read_multi_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint16_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *a = *(volatile uint16_t *)(addr);
}

static __inline void
vax_mem_read_multi_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint32_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *a = *(volatile uint32_t *)(addr);
}

/*
 *      void bus_space_read_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          u_intN_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.
 */

static __inline void vax_mem_read_region_1(bus_space_tag_t,
        bus_space_handle_t, bus_size_t, uint8_t *, size_t);
static __inline void vax_mem_read_region_2(bus_space_tag_t,
        bus_space_handle_t, bus_size_t, uint16_t *, size_t);
static __inline void vax_mem_read_region_4(bus_space_tag_t,
        bus_space_handle_t, bus_size_t, uint32_t *, size_t);

#define bus_space_read_region_1(t, h, o, a, c)                          \
do {                                                                    \
        vax_mem_read_region_1((t), (h), (o), (a), (c));         \
} while (0)

#define bus_space_read_region_2(t, h, o, a, c)                          \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint16_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_read_region_2((t), (h), (o), (a), (c));         \
} while (0)

#define bus_space_read_region_4(t, h, o, a, c)                          \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint32_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_read_region_4((t), (h), (o), (a), (c));         \
} while (0)

#if 0   /* Cause a link error for bus_space_read_region_8 */
#define bus_space_read_region_8                                 \
                        !!! bus_space_read_region_8 unimplemented !!!
#endif

static __inline void
vax_mem_read_region_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint8_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr++, a++)
                *a = *(volatile uint8_t *)(addr);
}

static __inline void
vax_mem_read_region_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint16_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr += 2, a++)
                *a = *(volatile uint16_t *)(addr);
}

static __inline void
vax_mem_read_region_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint32_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr += 4, a++)
                *a = *(volatile uint32_t *)(addr);
}

/*
 *      void bus_space_write_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          u_intN_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)(*(volatile uint8_t *)((h) + (o)) = (v)));               \
} while (0)

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

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

#if 0   /* Cause a link error for bus_space_write_8 */
#define bus_space_write_8       !!! bus_space_write_8 not implemented !!!
#endif

/*
 *      void bus_space_write_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          const u_intN_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.
 */
static __inline void
        vax_mem_write_multi_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint8_t *, size_t),
        vax_mem_write_multi_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint16_t *, size_t),
        vax_mem_write_multi_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint32_t *, size_t);

#define bus_space_write_multi_1(t, h, o, a, c)                          \
do {                                                                    \
        vax_mem_write_multi_1((t), (h), (o), (a), (c));         \
} while (0)

#define bus_space_write_multi_2(t, h, o, a, c)                          \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint16_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_write_multi_2((t), (h), (o), (a), (c));         \
} while (0)

#define bus_space_write_multi_4(t, h, o, a, c)                          \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint32_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_write_multi_4((t), (h), (o), (a), (c));         \
} while (0)

#if 0   /* Cause a link error for bus_space_write_multi_8 */
#define bus_space_write_multi_8(t, h, o, a, c)                          \
                        !!! bus_space_write_multi_8 unimplemented !!!
#endif

static __inline void
vax_mem_write_multi_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint8_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *(volatile uint8_t *)(addr) = *a;
}

static __inline void
vax_mem_write_multi_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint16_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *(volatile uint16_t *)(addr) = *a;
}

static __inline void
vax_mem_write_multi_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint32_t *a, size_t c)
{
        const bus_addr_t addr = h + o;

        for (; c != 0; c--, a++)
                *(volatile uint32_t *)(addr) = *a;
}

/*
 *      void bus_space_write_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          const u_intN_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'.
 */
static __inline void
        vax_mem_write_region_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint8_t *, size_t),
        vax_mem_write_region_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint16_t *, size_t),
        vax_mem_write_region_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            const uint32_t *, size_t);

#define bus_space_write_region_1(t, h, o, a, c)                         \
        vax_mem_write_region_1((t), (h), (o), (a), (c))

#define bus_space_write_region_2(t, h, o, a, c)                         \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint16_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_write_region_2((t), (h), (o), (a), (c));                \
} while (0)

#define bus_space_write_region_4(t, h, o, a, c)                         \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((a), uint32_t, "buffer");            \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_write_region_4((t), (h), (o), (a), (c));                \
} while (0)

#if 0   /* Cause a link error for bus_space_write_region_8 */
#define bus_space_write_region_8                                        \
                        !!! bus_space_write_region_8 unimplemented !!!
#endif

static __inline void
vax_mem_write_region_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint8_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr++, a++)
                *(volatile uint8_t *)(addr) = *a;
}

static __inline void
vax_mem_write_region_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint16_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr++, a++)
                *(volatile uint16_t *)(addr) = *a;
}

static __inline void
vax_mem_write_region_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        const uint32_t *a, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr++, a++)
                *(volatile uint32_t *)(addr) = *a;
}

/*
 *      void bus_space_set_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, u_intN_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.
 */

static __inline void
        vax_mem_set_multi_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint8_t, size_t),
        vax_mem_set_multi_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint16_t, size_t),
        vax_mem_set_multi_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint32_t, size_t);

#define bus_space_set_multi_1(t, h, o, v, c)                            \
        vax_mem_set_multi_1((t), (h), (o), (v), (c))

#define bus_space_set_multi_2(t, h, o, v, c)                            \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_set_multi_2((t), (h), (o), (v), (c));           \
} while (0)

#define bus_space_set_multi_4(t, h, o, v, c)                            \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_set_multi_4((t), (h), (o), (v), (c));           \
} while (0)

static __inline void
vax_mem_set_multi_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint8_t v, size_t c)
{
        bus_addr_t addr = h + o;

        while (c--)
                *(volatile uint8_t *)(addr) = v;
}

static __inline void
vax_mem_set_multi_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint16_t v, size_t c)
{
        bus_addr_t addr = h + o;

        while (c--)
                *(volatile uint16_t *)(addr) = v;
}

static __inline void
vax_mem_set_multi_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint32_t v, size_t c)
{
        bus_addr_t addr = h + o;

        while (c--)
                *(volatile uint32_t *)(addr) = v;
}

#if 0   /* Cause a link error for bus_space_set_multi_8 */
#define bus_space_set_multi_8 !!! bus_space_set_multi_8 unimplemented !!!
#endif

/*
 *      void bus_space_set_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, u_intN_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'.
 */

static __inline void
        vax_mem_set_region_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint8_t, size_t),
        vax_mem_set_region_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint16_t, size_t),
        vax_mem_set_region_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            uint32_t, size_t);

#define bus_space_set_region_1(t, h, o, v, c)                           \
        vax_mem_set_region_1((t), (h), (o), (v), (c))

#define bus_space_set_region_2(t, h, o, v, c)                           \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint16_t, "bus addr");    \
        vax_mem_set_region_2((t), (h), (o), (v), (c));          \
} while (0)

#define bus_space_set_region_4(t, h, o, v, c)                           \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h) + (o), uint32_t, "bus addr");    \
        vax_mem_set_region_4((t), (h), (o), (v), (c));          \
} while (0)

static __inline void
vax_mem_set_region_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint8_t v, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr++)
                *(volatile uint8_t *)(addr) = v;
}

static __inline void
vax_mem_set_region_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint16_t v, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr += 2)
                *(volatile uint16_t *)(addr) = v;
}

static __inline void
vax_mem_set_region_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o,
        uint32_t v, size_t c)
{
        bus_addr_t addr = h + o;

        for (; c != 0; c--, addr += 4)
                *(volatile uint32_t *)(addr) = v;
}

#if 0   /* Cause a link error for bus_space_set_region_8 */
#define bus_space_set_region_8  !!! bus_space_set_region_8 unimplemented !!!
#endif

/*
 *      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,
 *          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.
 */

static __inline void
        vax_mem_copy_region_1(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            bus_space_handle_t, bus_size_t, size_t),
        vax_mem_copy_region_2(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            bus_space_handle_t, bus_size_t, size_t),
        vax_mem_copy_region_4(bus_space_tag_t, bus_space_handle_t, bus_size_t,
            bus_space_handle_t, bus_size_t, size_t);

#define bus_space_copy_region_1(t, h1, o1, h2, o2, c)                   \
        vax_mem_copy_region_1((t), (h1), (o1), (h2), (o2), (c))

#define bus_space_copy_region_2(t, h1, o1, h2, o2, c)                   \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h1) + (o1), uint16_t, "bus addr 1"); \
        __BUS_SPACE_ADDRESS_SANITY((h2) + (o2), uint16_t, "bus addr 2"); \
        vax_mem_copy_region_2((t), (h1), (o1), (h2), (o2), (c));        \
} while (0)

#define bus_space_copy_region_4(t, h1, o1, h2, o2, c)                   \
do {                                                                    \
        __BUS_SPACE_ADDRESS_SANITY((h1) + (o1), uint32_t, "bus addr 1"); \
        __BUS_SPACE_ADDRESS_SANITY((h2) + (o2), uint32_t, "bus addr 2"); \
        vax_mem_copy_region_4((t), (h1), (o1), (h2), (o2), (c));        \
} while (0)

static __inline void
vax_mem_copy_region_1(bus_space_tag_t t, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, size_t c)
{
        bus_addr_t addr1 = h1 + o1;
        bus_addr_t addr2 = h2 + o2;

        if (addr1 >= addr2) {
                /* src after dest: copy forward */
                for (; c != 0; c--, addr1++, addr2++)
                        *(volatile uint8_t *)(addr2) =
                            *(volatile uint8_t *)(addr1);
        } else {
                /* dest after src: copy backwards */
                for (addr1 += (c - 1), addr2 += (c - 1);
                    c != 0; c--, addr1--, addr2--)
                        *(volatile uint8_t *)(addr2) =
                            *(volatile uint8_t *)(addr1);
        }
}

static __inline void
vax_mem_copy_region_2(bus_space_tag_t t, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, size_t c)
{
        bus_addr_t addr1 = h1 + o1;
        bus_addr_t addr2 = h2 + o2;

        if (addr1 >= addr2) {
                /* src after dest: copy forward */
                for (; c != 0; c--, addr1 += 2, addr2 += 2)
                        *(volatile uint16_t *)(addr2) =
                            *(volatile uint16_t *)(addr1);
        } else {
                /* dest after src: copy backwards */
                for (addr1 += 2 * (c - 1), addr2 += 2 * (c - 1);
                    c != 0; c--, addr1 -= 2, addr2 -= 2)
                        *(volatile uint16_t *)(addr2) =
                            *(volatile uint16_t *)(addr1);
        }
}

static __inline void
vax_mem_copy_region_4(bus_space_tag_t t, bus_space_handle_t h1, bus_size_t o1,
        bus_space_handle_t h2, bus_size_t o2, size_t c)
{
        bus_addr_t addr1 = h1 + o1;
        bus_addr_t addr2 = h2 + o2;

        if (addr1 >= addr2) {
                /* src after dest: copy forward */
                for (; c != 0; c--, addr1 += 4, addr2 += 4)
                        *(volatile uint32_t *)(addr2) =
                            *(volatile uint32_t *)(addr1);
        } else {
                /* dest after src: copy backwards */
                for (addr1 += 4 * (c - 1), addr2 += 4 * (c - 1);
                    c != 0; c--, addr1 -= 4, addr2 -= 4)
                        *(volatile uint32_t *)(addr2) =
                            *(volatile uint32_t *)(addr1);
        }
}

#if 0   /* Cause a link error for bus_space_copy_8 */
#define bus_space_copy_region_8 !!! bus_space_copy_region_8 unimplemented !!!
#endif


/*
 * 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);
 *
 * Note: the vax does not currently require barriers, but we must
 * provide the flags to MI code.
 */
#define bus_space_barrier(t, h, o, l, f)        \
        ((void)((void)(t), (void)(h), (void)(o), (void)(l), (void)(f)))
#define BUS_SPACE_BARRIER_READ  0x01            /* force read barrier */
#define BUS_SPACE_BARRIER_WRITE 0x02            /* force write barrier */


/*
 * 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 VAX_BUS_DMA_SPILLPAGE   BUS_DMA_BUS1    /* VS4000 kludge */
/*
 * Private flags stored in the DMA map.
 */
#define DMAMAP_HAS_SGMAP        0x80000000      /* sgva/len are valid */

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

/*
 * 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 */

/*
 *      vax_bus_t
 *
 *      Busses supported by NetBSD/vax, used by internal
 *      utility functions.  NOT TO BE USED BY MACHINE-INDEPENDENT
 *      CODE!
 */
typedef enum {
        VAX_BUS_MAINBUS,
        VAX_BUS_SBI,
        VAX_BUS_MASSBUS,
        VAX_BUS_UNIBUS,         /* Also handles QBUS */
        VAX_BUS_BI,
        VAX_BUS_XMI,
        VAX_BUS_TURBOCHANNEL
} vax_bus_t;

typedef struct vax_bus_dma_tag  *bus_dma_tag_t;
typedef struct vax_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 vax_bus_dma_segment {
        bus_addr_t      ds_addr;        /* DMA address */
        bus_size_t      ds_len;         /* length of transfer */
};
typedef struct vax_bus_dma_segment      bus_dma_segment_t;

struct proc;

/*
 *      bus_dma_tag_t
 *
 *      A machine-dependent opaque type describing the implementation of
 *      DMA for a given bus.
 */
struct vax_bus_dma_tag {
        void    *_cookie;               /* cookie used in the guts */
        bus_addr_t _wbase;              /* DMA window base */
        bus_size_t _wsize;              /* DMA window size */

        /*
         * Some chipsets have a built-in boundary constraint, independent
         * of what the device requests.  This allows that boundary to
         * be specified.  If the device has a more restrictive constraint,
         * the map will use that, otherwise this boundary will be used.
         * This value is ignored if 0.
         */
        bus_size_t _boundary;

        /*
         * A bus may have more than one SGMAP window, so SGMAP
         * windows also get a pointer to their SGMAP state.
         */
        struct vax_sgmap *_sgmap;

        /*
         * Internal-use only utility methods.  NOT TO BE USED BY
         * MACHINE-INDEPENDENT CODE!
         */
        bus_dma_tag_t (*_get_tag)(bus_dma_tag_t, vax_bus_t);

        /*
         * 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);
};

#define vaxbus_dma_get_tag(t, b)                                \
        (*(t)->_get_tag)(t, b)

#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 vax_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 */

        /*
         * This is used only for SGMAP-mapped DMA, but we keep it
         * here to avoid pointless indirection.
         */
        int             _dm_pteidx;     /* PTE index */
        int             _dm_ptecnt;     /* PTE count */
        u_long          _dm_sgva;       /* allocated sgva */
        bus_size_t      _dm_sgvalen;    /* svga length */

        /*
         * 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 _VAX_BUS_DMA_PRIVATE */
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(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);
/*#endif*/ /* _VAX_BUS_DMA_PRIVATE */

#endif /* _VAX_BUS_H_ */