/*      $NetBSD: isadma_machdep.c,v 1.18 2023/12/20 15:34:45 thorpej 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isadma_machdep.c,v 1.18 2023/12/20 15:34:45 thorpej Exp $");

#define ISA_DMA_STATS

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/mbuf.h>

#define _ARM32_BUS_DMA_PRIVATE
#include <sys/bus.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <uvm/uvm_extern.h>

/*
* ISA has a 24-bit address limitation, so at most it has a 16M
* DMA range.  However, some platforms have a more limited range,
* e.g. the Shark NC.  On these systems, we are provided with
* a set of DMA ranges.  The pmap module is aware of these ranges
* and places DMA-safe memory for them onto an alternate free list
* so that they are protected from being used to service page faults,
* etc. (unless we've run out of memory elsewhere).
*/
extern struct arm32_dma_range *shark_isa_dma_ranges;
extern int shark_isa_dma_nranges;

/*
* Entry points for ISA DMA.  These are mostly wrappers around
* the generic functions that understand how to deal with bounce
* buffers, if necessary.
*/
struct arm32_bus_dma_tag isa_bus_dma_tag = {
       _BUS_DMAMAP_FUNCS,
       _BUS_DMAMEM_FUNCS,
       _BUS_DMATAG_FUNCS,
};

/*
* Initialize ISA DMA.
*/
void
isa_dma_init(void)
{

       isa_bus_dma_tag._ranges = shark_isa_dma_ranges;
       isa_bus_dma_tag._nranges = shark_isa_dma_nranges;
}