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      1 /*	$NetBSD: mipssim_dma.c,v 1.2 2022/12/28 11:40:35 he Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2021 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Platform-specific DMA support for the mipssim.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: mipssim_dma.c,v 1.2 2022/12/28 11:40:35 he Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/device.h>
     41 
     42 #define	_MIPS_BUS_DMA_PRIVATE
     43 #include <sys/bus.h>
     44 
     45 #include <dev/isa/isavar.h>
     46 
     47 #include <evbmips/mipssim/mipssimreg.h>
     48 #include <evbmips/mipssim/mipssimvar.h>
     49 
     50 void
     51 mipssim_dma_init(struct mipssim_config *mcp)
     52 {
     53 	bus_dma_tag_t t;
     54 
     55 	t = &mcp->mc_dmat;
     56 	t->_cookie = mcp;
     57 	t->_wbase = MIPSSIM_DMA_BASE;
     58 	t->_bounce_alloc_lo = MIPSSIM_DMA_PHYSBASE;
     59 	t->_bounce_alloc_hi = MIPSSIM_DMA_PHYSBASE + MIPSSIM_DMA_SIZE;
     60 	t->_bounce_thresh = t->_bounce_alloc_hi; /* as an approximation */
     61 	t->_dmamap_ops = mips_bus_dmamap_ops;
     62 	t->_dmamem_ops = mips_bus_dmamem_ops;
     63 	t->_dmatag_ops = mips_bus_dmatag_ops;
     64 }
     65