NetBSD-5.0.2/sys/arch/sun68k/sun68k/bus.c
/* $NetBSD: bus.c,v 1.21 2008/06/04 12:41:41 ad Exp $ */
/*
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: Utah Hdr: machdep.c 1.74 92/12/20
* from: @(#)machdep.c 8.10 (Berkeley) 4/20/94
*/
/*
* Copyright (c) 2001 Matthew Fredette.
* Copyright (c) 1994, 1995 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: Utah Hdr: machdep.c 1.74 92/12/20
* from: @(#)machdep.c 8.10 (Berkeley) 4/20/94
*/
/*-
* 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) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)machdep.c 8.6 (Berkeley) 1/14/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bus.c,v 1.21 2008/06/04 12:41:41 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <uvm/uvm.h> /* XXX: not _extern ... need vm_map_create */
#include <machine/pte.h>
#define _SUN68K_BUS_DMA_PRIVATE
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/mon.h>
#include <machine/pmap.h>
#include <sun68k/sun68k/control.h>
/*
* Common function for DMA map creation. May be called by bus-specific
* DMA map creation functions.
*/
int
_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments,
bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp)
{
struct sun68k_bus_dmamap *map;
void *mapstore;
size_t mapsize;
/*
* Allocate and initialize the DMA map. The end of the map
* is a variable-sized array of segments, so we allocate enough
* room for them in one shot.
*
* Note we don't preserve the WAITOK or NOWAIT flags. Preservation
* of ALLOCNOW notifies others that we've reserved these resources,
* and they are not to be freed.
*
* The bus_dmamap_t includes one bus_dma_segment_t, hence
* the (nsegments - 1).
*/
mapsize = sizeof(struct sun68k_bus_dmamap) +
(sizeof(bus_dma_segment_t) * (nsegments - 1));
if ((mapstore = malloc(mapsize, M_DMAMAP,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
return (ENOMEM);
memset(mapstore, 0, mapsize);
map = (struct sun68k_bus_dmamap *)mapstore;
map->_dm_size = size;
map->_dm_segcnt = nsegments;
map->_dm_maxmaxsegsz = maxsegsz;
map->_dm_boundary = boundary;
map->_dm_align = PAGE_SIZE;
map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
map->dm_maxsegsz = maxsegsz;
map->dm_mapsize = 0; /* no valid mappings */
map->dm_nsegs = 0;
*dmamp = map;
return (0);
}
/*
* Common function for DMA map destruction. May be called by bus-specific
* DMA map destruction functions.
*/
void
_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map)
{
/*
* If the handle contains a valid mapping, unload it.
*/
if (map->dm_mapsize != 0)
bus_dmamap_unload(t, map);
free(map, M_DMAMAP);
}
/*
* Common function for DMA-safe memory allocation. May be called
* by bus-specific DMA memory allocation functions.
*/
int
_bus_dmamem_alloc(bus_dma_tag_t t, 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, high;
struct pglist *mlist;
int error;
extern paddr_t avail_start;
extern paddr_t avail_end;
/* Always round the size. */
size = m68k_round_page(size);
low = avail_start;
high = avail_end;
if ((mlist = malloc(sizeof(*mlist), M_DEVBUF,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
return (ENOMEM);
/*
* Allocate physical pages from the VM system.
*/
error = uvm_pglistalloc(size, low, high, 0, 0,
mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
if (error)
return (error);
/*
* Simply keep a pointer around to the linked list, so
* bus_dmamap_free() can return it.
*
* NOBODY SHOULD TOUCH THE pageq.queue FIELDS WHILE THESE PAGES
* ARE IN OUR CUSTODY.
*/
segs[0]._ds_mlist = mlist;
/*
* We now have physical pages, but no DVMA addresses yet. These
* will be allocated in bus_dmamap_load*() routines. Hence we
* save any alignment and boundary requirements in this DMA
* segment.
*/
segs[0].ds_addr = 0;
segs[0].ds_len = 0;
segs[0]._ds_va = 0;
*rsegs = 1;
return (0);
}
/*
* Common function for freeing DMA-safe memory. May be called by
* bus-specific DMA memory free functions.
*/
void
_bus_dmamem_free(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs)
{
if (nsegs != 1)
panic("bus_dmamem_free: nsegs = %d", nsegs);
/*
* Return the list of physical pages back to the VM system.
*/
uvm_pglistfree(segs[0]._ds_mlist);
free(segs[0]._ds_mlist, M_DEVBUF);
}
/*
* Common function for mapping DMA-safe memory. May be called by
* bus-specific DMA memory map functions.
*/
int
_bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs,
size_t size, void **kvap, int flags)
{
struct vm_page *m;
vaddr_t va;
struct pglist *mlist;
const uvm_flag_t kmflags =
(flags & BUS_DMA_NOWAIT) != 0 ? UVM_KMF_NOWAIT : 0;
if (nsegs != 1)
panic("_bus_dmamem_map: nsegs = %d", nsegs);
size = m68k_round_page(size);
va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY | kmflags);
if (va == 0)
return (ENOMEM);
segs[0]._ds_va = va;
*kvap = (void *)va;
mlist = segs[0]._ds_mlist;
for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq.queue)) {
paddr_t pa;
if (size == 0)
panic("_bus_dmamem_map: size botch");
pa = VM_PAGE_TO_PHYS(m);
pmap_enter(pmap_kernel(), va, pa | PMAP_NC,
VM_PROT_READ | VM_PROT_WRITE,
VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
va += PAGE_SIZE;
size -= PAGE_SIZE;
}
pmap_update(pmap_kernel());
return (0);
}
/*
* Common function for unmapping DMA-safe memory. May be called by
* bus-specific DMA memory unmapping functions.
*/
void
_bus_dmamem_unmap(bus_dma_tag_t t, void *kva, size_t size)
{
#ifdef DIAGNOSTIC
if ((u_long)kva & PAGE_MASK)
panic("_bus_dmamem_unmap");
#endif
size = m68k_round_page(size);
uvm_unmap(kernel_map, (vaddr_t)kva, (vaddr_t)kva + size);
}
/*
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
* bus-specific DMA mmap(2)'ing functions.
*/
paddr_t
_bus_dmamem_mmap(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs, off_t off,
int prot, int flags)
{
panic("_bus_dmamem_mmap: not implemented");
}
/*
* Utility to allocate an aligned kernel virtual address range
*/
vaddr_t
_bus_dma_valloc_skewed(size_t size, u_long boundary, u_long align, u_long skew)
{
vaddr_t va;
/*
* Find a region of kernel virtual addresses that is aligned
* to the given address modulo the requested alignment, i.e.
*
* (va - skew) == 0 mod align
*
* The following conditions apply to the arguments:
*
* - `size' must be a multiple of the VM page size
* - `align' must be a power of two
* and greater than or equal to the VM page size
* - `skew' must be smaller than `align'
* - `size' must be smaller than `boundary'
*/
#ifdef DIAGNOSTIC
if ((size & PAGE_MASK) != 0)
panic("_bus_dma_valloc_skewed: invalid size %lx", (unsigned long) size);
if ((align & PAGE_MASK) != 0)
panic("_bus_dma_valloc_skewed: invalid alignment %lx", align);
if (align < skew)
panic("_bus_dma_valloc_skewed: align %lx < skew %lx",
align, skew);
#endif
/* XXX - Implement this! */
if (boundary || skew)
panic("_bus_dma_valloc_skewed: not implemented");
/*
* First, find a region large enough to contain any aligned chunk
*/
va = uvm_km_alloc(kernel_map, size, align, UVM_KMF_VAONLY);
if (va == 0)
return (ENOMEM);
return (va);
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m,
int flags)
{
panic("_bus_dmamap_load_mbuf: not implemented");
}
/*
* Like _bus_dmamap_load(), but for uios.
*/
int
_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio,
int flags)
{
panic("_bus_dmamap_load_uio: not implemented");
}
/*
* Common function for DMA map synchronization. May be called
* by bus-specific DMA map synchronization functions.
*/
void
_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset,
bus_size_t len, int ops)
{
}
struct sun68k_bus_dma_tag mainbus_dma_tag = {
NULL,
_bus_dmamap_create,
_bus_dmamap_destroy,
_bus_dmamap_load,
_bus_dmamap_load_mbuf,
_bus_dmamap_load_uio,
_bus_dmamap_load_raw,
_bus_dmamap_unload,
_bus_dmamap_sync,
_bus_dmamem_alloc,
_bus_dmamem_free,
_bus_dmamem_map,
_bus_dmamem_unmap,
_bus_dmamem_mmap
};
/*
* Base bus space handlers.
*/
static int sun68k_bus_map(bus_space_tag_t, bus_type_t, bus_addr_t,
bus_size_t, int, vaddr_t, bus_space_handle_t *);
static int sun68k_bus_unmap(bus_space_tag_t, bus_space_handle_t,
bus_size_t);
static int sun68k_bus_subregion(bus_space_tag_t, bus_space_handle_t,
bus_size_t, bus_size_t, bus_space_handle_t *);
static paddr_t sun68k_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t, off_t,
int, int);
static void *sun68k_mainbus_intr_establish(bus_space_tag_t, int, int, int,
int (*)(void *), void *);
static void sun68k_bus_barrier(bus_space_tag_t, bus_space_handle_t,
bus_size_t, bus_size_t, int);
static int sun68k_bus_peek(bus_space_tag_t, bus_space_handle_t,
bus_size_t, size_t, void *);
static int sun68k_bus_poke(bus_space_tag_t, bus_space_handle_t,
bus_size_t, size_t, uint32_t);
int
sun68k_bus_map(bus_space_tag_t t, bus_type_t iospace, bus_addr_t addr,
bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp)
{
bus_size_t offset;
vaddr_t v;
/*
* If we suspect there might be one, try to find
* and use a PROM mapping.
*/
if ((flags & _SUN68K_BUS_MAP_USE_PROM) != 0 &&
find_prom_map(addr, iospace, size, &v) == 0) {
*hp = (bus_space_handle_t)v;
return (0);
}
/*
* Adjust the user's request to be page-aligned.
*/
offset = addr & PGOFSET;
addr -= offset;
size += offset;
size = m68k_round_page(size);
if (size == 0) {
printf("sun68k_bus_map: zero size\n");
return (EINVAL);
}
/* Get some kernel virtual address space. */
if (vaddr)
v = vaddr;
else
v = uvm_km_alloc(kernel_map, size, 0,
UVM_KMF_VAONLY | UVM_KMF_WAITVA);
if (v == 0)
panic("sun68k_bus_map: no memory");
/* note: preserve page offset */
*hp = (bus_space_handle_t)(v | offset);
/*
* Map the device.
*/
addr |= iospace | PMAP_NC;
pmap_map(v, addr, addr + size, VM_PROT_ALL);
return (0);
}
int
sun68k_bus_unmap(bus_space_tag_t t, bus_space_handle_t bh, bus_size_t size)
{
bus_size_t offset;
vaddr_t va = (vaddr_t)bh;
/*
* Adjust the user's request to be page-aligned.
*/
offset = va & PGOFSET;
va -= offset;
size += offset;
size = m68k_round_page(size);
if (size == 0) {
printf("sun68k_bus_unmap: zero size\n");
return (EINVAL);
}
/*
* If any part of the request is in the PROM's address space,
* don't unmap it.
*/
#ifdef DIAGNOSTIC
if ((va >= SUN_MONSTART && va < SUN_MONEND) !=
((va + size) >= SUN_MONSTART && (va + size) < SUN_MONEND))
panic("sun_bus_unmap: bad PROM mapping");
#endif
if (va >= SUN_MONSTART && va < SUN_MONEND)
return (0);
pmap_remove(pmap_kernel(), va, va + size);
pmap_update(pmap_kernel());
uvm_km_free(kernel_map, va, size, UVM_KMF_VAONLY);
return (0);
}
int
sun68k_bus_subregion(bus_space_tag_t tag, bus_space_handle_t handle,
bus_size_t offset, bus_size_t size, bus_space_handle_t *nhandlep)
{
*nhandlep = handle + offset;
return (0);
}
paddr_t
sun68k_bus_mmap(bus_space_tag_t t, bus_type_t iospace, bus_addr_t paddr,
off_t offset, int prot, int flags)
{
paddr_t npaddr;
npaddr = m68k_trunc_page(paddr + offset);
return (npaddr | (paddr_t)iospace | PMAP_NC);
}
/*
* These assist in device probes.
*/
extern label_t *nofault;
int
sun68k_bus_peek(bus_space_tag_t tag, bus_space_handle_t handle,
bus_size_t offset, size_t size, void *vp)
{
int result;
label_t faultbuf;
uint32_t junk;
if (vp == NULL)
vp = &junk;
nofault = &faultbuf;
if (setjmp(&faultbuf))
result = -1;
else {
switch(size) {
case 1:
*((uint8_t *)vp) =
bus_space_read_1(tag, handle, offset);
break;
case 2:
*((uint16_t *)vp) =
bus_space_read_2(tag, handle, offset);
break;
case 4:
*((uint32_t *)vp) =
bus_space_read_4(tag, handle, offset);
break;
default:
panic("_bus_space_peek: bad size");
}
result = 0;
}
nofault = NULL;
return (result);
}
int
sun68k_bus_poke(bus_space_tag_t tag, bus_space_handle_t handle,
bus_size_t offset, size_t size, uint32_t v)
{
int result;
label_t faultbuf;
nofault = &faultbuf;
if (setjmp(&faultbuf))
result = -1;
else {
switch(size) {
case 1:
bus_space_write_1(tag, handle, offset, (uint8_t)v);
break;
case 2:
bus_space_write_2(tag, handle, offset, (uint16_t)v);
break;
case 4:
bus_space_write_4(tag, handle, offset, (uint32_t)v);
break;
default:
panic("_bus_space_poke: bad size");
}
result = 0;
}
nofault = NULL;
return (result);
}
void *
sun68k_mainbus_intr_establish(bus_space_tag_t t, int pil, int level, int flags,
int (*handler)(void *), void *arg)
{
isr_add_autovect(handler, arg, pil);
return (NULL);
}
void
sun68k_bus_barrier(bus_space_tag_t t, bus_space_handle_t h, bus_size_t offset,
bus_size_t size, int flags)
{
/* No default barrier action defined */
return;
}
struct sun68k_bus_space_tag mainbus_space_tag = {
NULL, /* cookie */
NULL, /* parent bus tag */
sun68k_bus_map, /* bus_space_map */
sun68k_bus_unmap, /* bus_space_unmap */
sun68k_bus_subregion, /* bus_space_subregion */
sun68k_bus_barrier, /* bus_space_barrier */
sun68k_bus_mmap, /* bus_space_mmap */
sun68k_mainbus_intr_establish, /* bus_intr_establish */
sun68k_bus_peek, /* bus_space_peek_N */
sun68k_bus_poke /* bus_space_poke_N */
};