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