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89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* $NetBSD: isadma_machdep.c,v 1.16 2012/09/21 14:21:58 matt Exp $ */
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#define ISA_DMA_STATS
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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 Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* 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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*
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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: isadma_machdep.c,v 1.16 2012/09/21 14:21:58 matt Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#define _ARM32_BUS_DMA_PRIVATE
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#include <sys/bus.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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#include <uvm/uvm_extern.h>
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/*
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* ISA has a 24-bit address limitation, so at most it has a 16M
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* DMA range. However, some platforms have a more limited range,
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* e.g. the Shark NC. On these systems, we are provided with
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* a set of DMA ranges. The pmap module is aware of these ranges
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* and places DMA-safe memory for them onto an alternate free list
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* so that they are protected from being used to service page faults,
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* etc. (unless we've run out of memory elsewhere).
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*/
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#define ISA_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024)
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struct arm32_dma_range *footbridge_isa_dma_ranges;
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int footbridge_isa_dma_nranges;
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/*
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* Entry points for ISA DMA. These are mostly wrappers around
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* the generic functions that understand how to deal with bounce
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* buffers, if necessary.
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*/
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struct arm32_bus_dma_tag isa_bus_dma_tag = {
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_BUS_DMAMAP_FUNCS,
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_BUS_DMAMEM_FUNCS,
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_BUS_DMATAG_FUNCS,
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};
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/*
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* Initialize ISA DMA.
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*/
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void
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isa_dma_init(void)
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{
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isa_bus_dma_tag._ranges = footbridge_isa_dma_ranges;
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isa_bus_dma_tag._nranges = footbridge_isa_dma_nranges;
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}
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