/*      $OpenBSD: bus.h,v 1.13 2025/06/26 20:28:07 miod Exp $   */
/*      $NetBSD: bus.h,v 1.9 1998/01/13 18:32:15 scottr Exp $   */

/*-
 * Copyright (c) 1996, 1997, 1998 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) 1997 Scott Reynolds.  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. 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 _MACHINE_BUS_H_
#define _MACHINE_BUS_H_

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

/*
 * Access methods for bus resources and address space.
 */
typedef u_long bus_space_handle_t;
typedef struct luna88k_bus_space_tag *bus_space_tag_t;

struct luna88k_bus_space_tag {
        /* 'stride' for each bytes reading/writing */
        uint8_t bs_stride_1;
        uint8_t bs_stride_2;
        uint8_t bs_stride_4;
        uint8_t bs_stride_8;
        bus_size_t bs_offset;
        uint    bs_flags;
#define TAG_LITTLE_ENDIAN       0x01
};

#define SET_TAG_BIG_ENDIAN(t)           ((t))->bs_flags &= ~TAG_LITTLE_ENDIAN
#define SET_TAG_LITTLE_ENDIAN(t)        ((t))->bs_flags |= TAG_LITTLE_ENDIAN

#define IS_TAG_LITTLE_ENDIAN(t)         ((t)->bs_flags & TAG_LITTLE_ENDIAN)

/*
 *      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

static __inline__ int
bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
    bus_space_handle_t *bshp)
{
        /* direct-mapped on luna88k, with offset */
        *bshp = (bus_space_handle_t)(bpa + (t->bs_offset));
        return 0;
}

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

static __inline__ void
bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
{
        /* direct-mapped on luna88k; nothing to do */
        return;
}

/*
 *      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.
 */

static __inline__ 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)
{
        *nbshp = bsh + offset;
        return 0;
}

/*
 *      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.
 */

/* XXX: currently unimplemented on luna88k */

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

/* XXX: currently unimplemented on luna88k */

/*
 *      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 u_int8_t *)((h) + ((o) << (t->bs_stride_1))))

#define __bus_space_read_2(t, h, o)                                     \
    (*(volatile u_int16_t *)((h) + ((o) << (t->bs_stride_2))))

#define __bus_space_read_4(t, h, o)                                     \
    (*(volatile u_int32_t *)((h) + ((o) << (t->bs_stride_4))))

#define bus_space_read_2(t, h, o)                                       \
    ((IS_TAG_LITTLE_ENDIAN(t)) ?                                        \
        letoh16(__bus_space_read_2(t, h, o)) :                          \
        __bus_space_read_2(t, h, o))
        
#define bus_space_read_4(t, h, o)                                       \
    ((IS_TAG_LITTLE_ENDIAN(t)) ?                                        \
        letoh32(__bus_space_read_4(t, h, o)) :                          \
        __bus_space_read_4(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
bus_space_read_multi_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t count)
{
        while ((int)--count >= 0)
                *dest++ = bus_space_read_1(tag, handle, offset);
}

static __inline__ void
bus_space_read_multi_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t *dest, size_t count)
{
        while ((int)--count >= 0)
                *dest++ = bus_space_read_2(tag, handle, offset);
}

static __inline__ void
bus_space_read_multi_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t *dest, size_t count)
{
        while ((int)--count >= 0)
                *dest++ = bus_space_read_4(tag, handle, offset);
}

#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
bus_space_read_raw_multi_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t size)
{
        size >>= 1;
        while ((int)--size >= 0) {
                *(u_int16_t *)dest =
                    __bus_space_read_2(tag, handle, offset);
                dest += 2;
        }
}

static __inline__ void
bus_space_read_raw_multi_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t size)
{
        size >>= 2;
        while ((int)--size >= 0) {
                *(u_int32_t *)dest =
                    __bus_space_read_4(tag, handle, offset);
                dest += 4;
        }
}

/*
 *      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
bus_space_read_region_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t count)
{
        while ((int)--count >= 0)
                *dest++ = bus_space_read_1(tag, handle, offset++);
}

static __inline__ void
bus_space_read_region_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t *dest, size_t count)
{
        while ((int)--count >= 0) {
                *dest++ = bus_space_read_2(tag, handle, offset);
                offset += 2;
        }
}

static __inline__ void
bus_space_read_region_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t *dest, size_t count)
{
        while ((int)--count >= 0) {
                *dest++ = bus_space_read_4(tag, handle, offset);
                offset += 4;
        }
}

#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

/*
 *      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)                                   \
    ((void)(*(volatile u_int8_t *)((h) + ((o) << (t->bs_stride_1))) = (v)))

#define __bus_space_write_2(t, h, o, v)                                 \
    ((void)(*(volatile u_int16_t *)((h) + ((o) << (t->bs_stride_2))) = (v)))

#define __bus_space_write_4(t, h, o, v)                                 \
    ((void)(*(volatile u_int32_t *)((h) + ((o) << (t->bs_stride_4))) = (v)))

#define bus_space_write_2(t, h, o, v)                                   \
    __bus_space_write_2(t, h, o,                                        \
        (IS_TAG_LITTLE_ENDIAN(t)) ? htole16(v) : (v))

#define bus_space_write_4(t, h, o, v)                                   \
    __bus_space_write_4(t, h, o,                                        \
        (IS_TAG_LITTLE_ENDIAN(t)) ? htole32(v) : (v))

#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
bus_space_write_multi_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_1(tag, handle, offset, *dest++);
}

static __inline__ void
bus_space_write_multi_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t *dest, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_2(tag, handle, offset, *dest++);
}

static __inline__ void
bus_space_write_multi_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t *dest, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_4(tag, handle, offset, *dest++);
}

#if 0   /* Cause a link error for bus_space_write_8 */
#define bus_space_write_multi_8(t, h, o, a, c)                          \
                        !!! bus_space_write_multi_8 unimplemented !!!
#endif

static __inline__ void
bus_space_write_raw_multi_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t size)
{
        size >>= 1;
        while ((int)--size >= 0) {
                __bus_space_write_2(tag, handle, offset,*(u_int16_t *)dest);
                dest += 2;
        }
}

static __inline__ void
bus_space_write_raw_multi_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t size)
{
        size >>= 2;
        while ((int)--size >= 0) {
                __bus_space_write_4(tag, handle, offset, *(u_int32_t *)dest);
                dest += 4;
        }
}

/*
 *      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
bus_space_write_region_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t *dest, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_1(tag, handle, offset++, *dest++);
}

static __inline__ void
bus_space_write_region_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t *dest, size_t count)
{
        while ((int)--count >= 0) {
                bus_space_write_2(tag, handle, offset, *dest++);
                offset += 2;
        }
}

static __inline__ void
bus_space_write_region_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t *dest, size_t count)
{
        while ((int)--count >= 0) {
                bus_space_write_4(tag, handle, offset, *dest++);
                offset += 4;
        }
}

#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

/*
 *      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
bus_space_set_multi_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t value, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_1(tag, handle, offset, value);
}

static __inline__ void
bus_space_set_multi_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t value, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_2(tag, handle, offset, value);
}

static __inline__ void
bus_space_set_multi_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t value, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_4(tag, handle, offset, value);
}

#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
bus_space_set_region_1(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int8_t value, size_t count)
{
        while ((int)--count >= 0)
                bus_space_write_1(tag, handle, offset++, value);
}

static __inline__ void
bus_space_set_region_2(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int16_t value, size_t count)
{
        while ((int)--count >= 0) {
                bus_space_write_2(tag, handle, offset, value);
                offset += 2;
        }
}

static __inline__ void
bus_space_set_region_4(bus_space_tag_t tag, bus_space_handle_t handle,
    bus_addr_t offset, u_int32_t value, size_t count)
{
        while ((int)--count >= 0) {
                bus_space_write_4(tag, handle, offset, value);
                offset += 4;
        }
}

#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_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.
 */

#define __LUNA88K_copy_N(BYTES)                                 \
static __inline void __CONCAT(bus_space_copy_,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_,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)); \
        }                                                               \
}
__LUNA88K_copy_N(1)
__LUNA88K_copy_N(2)
__LUNA88K_copy_N(4)
#if 0   /* Cause a link error for bus_space_copy_8 */
#define bus_space_copy_8                                                \
                        !!! bus_space_copy_8 unimplemented !!!
#endif

#undef __LUNA88K_copy_N

/*
 * 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);
 *
 */
#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 */

#endif /* _MACHINE_BUS_H_ */