148 lines
5.2 KiB
C
148 lines
5.2 KiB
C
/* $NetBSD: bus_space_large.c,v 1.4 2005/01/22 07:35:33 tsutsui 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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/*
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* For large sparse bus space
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* (e.g. NEC RISCstation 2250 PCI memory space: 432MB)
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*
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* This bus_space uses either wired TLB or normal KSEG2 mapping
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* for each bus space region.
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*
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* Wired TLB will be used on the following cases:
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* - If requested region is already mapped by wired TLBs.
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* This is needed for some critical resources which are used
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* on kernel early stage (e.g. console device resources)
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* - If requested region size >= ARC_THRESHOLD_TO_USE_WIRED_TLB,
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* and enough wired TLBs are still free.
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* In this case, the size of wired TLBs becomes always
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* ARC_WIRED_PAGE_SIZE (i.e. 16MB). (See wired_map.c for detail.)
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bus_space_large.c,v 1.4 2005/01/22 07:35:33 tsutsui 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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#include <arc/arc/wired_map.h>
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static int arc_large_bus_space_compose_handle(bus_space_tag_t, bus_addr_t,
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bus_size_t, int, bus_space_handle_t *);
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static int arc_large_bus_space_dispose_handle(bus_space_tag_t,
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bus_space_handle_t, bus_size_t);
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static int arc_large_bus_space_paddr(bus_space_tag_t, bus_space_handle_t,
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paddr_t *);
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void
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arc_large_bus_space_init(bus_space_tag_t bst, const char *name, paddr_t paddr,
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bus_addr_t start, bus_size_t size)
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{
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arc_sparse_bus_space_init(bst, name, paddr, start, size);
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bst->bs_compose_handle = arc_large_bus_space_compose_handle;
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bst->bs_dispose_handle = arc_large_bus_space_dispose_handle;
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bst->bs_paddr = arc_large_bus_space_paddr;
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}
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static int
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arc_large_bus_space_compose_handle(bus_space_tag_t bst, bus_addr_t addr,
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bus_size_t size, int flags, bus_space_handle_t *bshp)
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{
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paddr_t pa;
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vaddr_t va;
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pa = bst->bs_pbase + (addr - bst->bs_start);
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/*
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* Check whether the physical address is already wired mapped
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* or not. If not mapped but requested region is large enough,
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* try to use wired TLB.
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*/
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if ((va = arc_contiguously_wired_mapped(pa, size)) != 0 ||
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(/* requested region is large enough? */
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size >= ARC_THRESHOLD_TO_USE_WIRED_TLB &&
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/* enough wired TLBs are still available? */
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(va = arc_map_wired(pa, size)) != 0)) {
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#ifdef DIAGNOSTIC
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/*
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* If wired TLB is used,
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* we will not make this bus_space region cacheable,
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* since other bus_space might share this wired TLB.
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*/
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if (flags & BUS_SPACE_MAP_CACHEABLE)
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printf("arc_large_bus_space_compose_handle: "
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"ignore cacheable 0x%llx..0x%llx\n",
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pa, pa + size - 1);
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#endif
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*bshp = va;
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return 0;
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}
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return arc_sparse_bus_space_compose_handle(bst, addr, size, flags,
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bshp);
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}
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static int
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arc_large_bus_space_dispose_handle(bus_space_tag_t bst, bus_space_handle_t bsh,
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bus_size_t size)
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{
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paddr_t pa;
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/*
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* We never free already wired TLB entries,
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* since the TLBs might be used for other bus_space region.
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*/
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if (arc_wired_map_extract(bsh, &pa))
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return 0;
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return arc_sparse_bus_space_dispose_handle(bst, bsh, size);
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}
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static int
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arc_large_bus_space_paddr(bus_space_tag_t bst, bus_space_handle_t bsh,
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paddr_t *pap)
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{
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if (arc_wired_map_extract(bsh, pap))
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return 0;
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return arc_sparse_bus_space_paddr(bst, bsh, pap);
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}
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