309 lines
8.2 KiB
C
309 lines
8.2 KiB
C
/* $NetBSD: bus_space.c,v 1.5 2003/07/15 02:43:42 lukem Exp $ */
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/*
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* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
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* Simulation Facility, NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.5 2003/07/15 02:43:42 lukem Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/extent.h>
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#include <uvm/uvm_extern.h>
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#include <machine/bus.h>
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void
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mipsco_bus_space_init(bst, name, paddr, vaddr, start, size)
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bus_space_tag_t bst;
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const char *name;
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paddr_t paddr;
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vaddr_t vaddr;
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bus_addr_t start;
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bus_size_t size;
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{
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bst->bs_name = name;
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bst->bs_extent = NULL;
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bst->bs_start = start;
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bst->bs_size = size;
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bst->bs_pbase = paddr;
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bst->bs_vbase = vaddr;
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bst->bs_compose_handle = mipsco_bus_space_compose_handle;
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bst->bs_dispose_handle = mipsco_bus_space_dispose_handle;
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bst->bs_paddr = mipsco_bus_space_paddr;
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bst->bs_map = mipsco_bus_space_map;
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bst->bs_unmap = mipsco_bus_space_unmap;
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bst->bs_subregion = mipsco_bus_space_subregion;
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bst->bs_mmap = mipsco_bus_space_mmap;
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bst->bs_alloc = mipsco_bus_space_alloc;
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bst->bs_free = mipsco_bus_space_free;
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bst->bs_aux = NULL;
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bst->bs_bswap = 0; /* No byte swap for stream methods */
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mipsco_bus_space_set_aligned_stride(bst, 0);
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}
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void
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mipsco_bus_space_init_extent(bst, storage, storagesize)
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bus_space_tag_t bst;
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caddr_t storage;
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size_t storagesize;
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{
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bst->bs_extent = extent_create(bst->bs_name,
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bst->bs_start, bst->bs_start + bst->bs_size, M_DEVBUF,
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storage, storagesize, EX_NOWAIT);
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if (bst->bs_extent == NULL)
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panic("mipsco_bus_space_init_extent: cannot create extent map %s",
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bst->bs_name);
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}
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void
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mipsco_bus_space_set_aligned_stride(bst, shift)
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bus_space_tag_t bst;
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unsigned int shift; /* log2(alignment) */
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{
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bst->bs_stride = shift;
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if (shift == 2) { /* XXX Assumes Big Endian & 4B */
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bst->bs_offset_1 = 3;
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bst->bs_offset_2 = 2;
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} else {
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bst->bs_offset_1 = 0;
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bst->bs_offset_2 = 0;
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}
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bst->bs_offset_4 = 0;
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bst->bs_offset_8 = 0;
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}
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static int malloc_safe = 0;
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void
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mipsco_bus_space_malloc_set_safe()
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{
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malloc_safe = EX_MALLOCOK;
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}
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int
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mipsco_bus_space_extent_malloc_flag()
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{
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return (malloc_safe);
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}
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int
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mipsco_bus_space_compose_handle(bst, addr, size, flags, bshp)
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bus_space_tag_t bst;
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bus_addr_t addr;
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bus_size_t size;
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int flags;
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bus_space_handle_t *bshp;
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{
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bus_space_handle_t bsh = bst->bs_vbase +
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((addr - bst->bs_start) << bst->bs_stride);
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/*
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* Since all buses can be linearly mappable, we don't have to check
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* BUS_SPACE_MAP_LINEAR and BUS_SPACE_MAP_PREFETCHABLE.
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*/
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if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) {
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*bshp = bsh;
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return (0);
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}
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if (bsh < MIPS_KSEG1_START) /* KUSEG or KSEG0 */
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panic("mipsco_bus_space_compose_handle: bad address 0x%x", bsh);
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if (bsh < MIPS_KSEG2_START) { /* KSEG1 */
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*bshp = MIPS_PHYS_TO_KSEG0(MIPS_KSEG1_TO_PHYS(bsh));
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return (0);
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}
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/*
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* KSEG2:
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* Do not make the page cacheable in this case, since:
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* - the page which this bus_space belongs might include
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* other bus_spaces.
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* or
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* - this bus might be mapped by wired TLB, in that case,
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* we cannot manupulate cacheable attribute with page granularity.
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*/
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#ifdef DIAGNOSTIC
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printf("mipsco_bus_space_compose_handle: ignore cacheable 0x%x\n", bsh);
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#endif
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*bshp = bsh;
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return (0);
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}
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int
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mipsco_bus_space_dispose_handle(bst, bsh, size)
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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bus_size_t size;
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{
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return (0);
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}
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int
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mipsco_bus_space_paddr(bst, bsh, pap)
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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paddr_t *pap;
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{
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if (bsh < MIPS_KSEG0_START) /* KUSEG */
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panic("mipsco_bus_space_paddr(%p): bad address", (caddr_t)bsh);
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else if (bsh < MIPS_KSEG1_START) /* KSEG0 */
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*pap = MIPS_KSEG0_TO_PHYS(bsh);
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else if (bsh < MIPS_KSEG2_START) /* KSEG1 */
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*pap = MIPS_KSEG1_TO_PHYS(bsh);
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else { /* KSEG2 */
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/*
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* Since this region may be mapped by wired TLB,
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* kvtophys() is not always available.
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*/
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*pap = bst->bs_pbase + (bsh - bst->bs_vbase);
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}
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return (0);
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}
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int
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mipsco_bus_space_map(bst, addr, size, flags, bshp)
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bus_space_tag_t bst;
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bus_addr_t addr;
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bus_size_t size;
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int flags;
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bus_space_handle_t *bshp;
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{
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int err;
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if (addr < bst->bs_start || addr + size > bst->bs_start + bst->bs_size)
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return (EINVAL);
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if (bst->bs_extent != NULL) {
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err = extent_alloc_region(bst->bs_extent, addr, size,
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EX_NOWAIT | malloc_safe);
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if (err)
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return (err);
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}
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return (bus_space_compose_handle(bst, addr, size, flags, bshp));
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}
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void
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mipsco_bus_space_unmap(bst, bsh, size)
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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bus_size_t size;
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{
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if (bst->bs_extent != NULL) {
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paddr_t pa;
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bus_addr_t addr;
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int err;
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/* bus_space_paddr() becomes unavailable after unmapping */
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err = bus_space_paddr(bst, bsh, &pa);
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if (err)
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panic("mipsco_bus_space_unmap: %s va %p: error %d",
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bst->bs_name, (caddr_t)bsh, err);
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addr = (bus_size_t)(pa - bst->bs_pbase) + bst->bs_start;
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extent_free(bst->bs_extent, addr, size,
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EX_NOWAIT | malloc_safe);
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}
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bus_space_dispose_handle(bst, bsh, size);
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}
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int
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mipsco_bus_space_subregion(bst, bsh, offset, size, nbshp)
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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bus_size_t offset;
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bus_size_t size;
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bus_space_handle_t *nbshp;
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{
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*nbshp = bsh + (offset << bst->bs_stride);
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return (0);
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}
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paddr_t
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mipsco_bus_space_mmap(bst, addr, off, prot, flags)
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bus_space_tag_t bst;
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bus_addr_t addr;
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off_t off;
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int prot;
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int flags;
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{
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/*
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* XXX We do not disallow mmap'ing of I/O space here,
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* XXX which we should be doing.
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*/
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if (addr < bst->bs_start ||
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(addr + off) >= (bst->bs_start + bst->bs_size))
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return (-1);
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return (mips_btop(bst->bs_pbase + (addr - bst->bs_start) + off));
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}
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int
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mipsco_bus_space_alloc(bst, start, end, size, align, boundary, flags, addrp, bshp)
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bus_space_tag_t bst;
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bus_addr_t start;
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bus_addr_t end;
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bus_size_t size;
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bus_size_t align;
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bus_size_t boundary;
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int flags;
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bus_addr_t *addrp;
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bus_space_handle_t *bshp;
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{
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u_long addr;
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int err;
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if (bst->bs_extent == NULL)
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panic("mipsco_bus_space_alloc: extent map %s not available",
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bst->bs_name);
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if (start < bst->bs_start ||
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start + size > bst->bs_start + bst->bs_size)
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return (EINVAL);
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err = extent_alloc_subregion(bst->bs_extent, start, end, size,
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align, boundary, EX_FAST | EX_NOWAIT | malloc_safe, &addr);
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if (err)
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return (err);
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*addrp = addr;
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return (bus_space_compose_handle(bst, addr, size, flags, bshp));
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}
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