irongate_dma.c revision 1.6
1 /* $NetBSD: irongate_dma.c,v 1.6 2011/07/01 19:19:49 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 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 * DMA support for the AMD 751 (``Irongate'') core logic chipset. 34 * 35 * The AMD 751 is really unlike all of the other Alpha PCI core logic 36 * chipsets. Instead, it looks like a normal PC chipset (not surprising, 37 * since it is used for Athlon processors). 38 * 39 * Because of this, it lacks all of the SGMAP hardware normally present 40 * on an Alpha system, and there are no DMA windows. Instead, a memory 41 * bus address is a PCI DMA address, and ISA DMA above 16M has to be 42 * bounced (this is not unlike the Jensen, actually). 43 */ 44 45 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 46 47 __KERNEL_RCSID(0, "$NetBSD: irongate_dma.c,v 1.6 2011/07/01 19:19:49 dyoung Exp $"); 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/device.h> 53 #include <sys/malloc.h> 54 55 #define _ALPHA_BUS_DMA_PRIVATE 56 #include <sys/bus.h> 57 58 #include <dev/pci/pcireg.h> 59 #include <dev/pci/pcivar.h> 60 61 #include <alpha/pci/irongatereg.h> 62 #include <alpha/pci/irongatevar.h> 63 64 #include <dev/isa/isareg.h> 65 #include <dev/isa/isavar.h> 66 67 bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 68 69 void 70 irongate_dma_init(struct irongate_config *icp) 71 { 72 bus_dma_tag_t t; 73 74 /* 75 * Initialize the DMA tag used for PCI DMA. 76 */ 77 t = &icp->ic_dmat_pci; 78 t->_cookie = icp; 79 t->_wbase = 0; 80 t->_wsize = 0x100000000UL; 81 t->_next_window = NULL; 82 t->_boundary = 0; 83 t->_sgmap = NULL; 84 t->_get_tag = irongate_dma_get_tag; 85 t->_dmamap_create = _bus_dmamap_create; 86 t->_dmamap_destroy = _bus_dmamap_destroy; 87 t->_dmamap_load = _bus_dmamap_load_direct; 88 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 89 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 90 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 91 t->_dmamap_unload = _bus_dmamap_unload; 92 t->_dmamap_sync = _bus_dmamap_sync; 93 94 t->_dmamem_alloc = _bus_dmamem_alloc; 95 t->_dmamem_free = _bus_dmamem_free; 96 t->_dmamem_map = _bus_dmamem_map; 97 t->_dmamem_unmap = _bus_dmamem_unmap; 98 t->_dmamem_mmap = _bus_dmamem_mmap; 99 100 /* 101 * Initialize the DMA tag used for ISA DMA. 102 */ 103 t = &icp->ic_dmat_isa; 104 t->_cookie = icp; 105 t->_wbase = 0; 106 t->_wsize = 0x1000000; 107 t->_next_window = NULL; 108 t->_boundary = 0; 109 t->_sgmap = NULL; 110 t->_get_tag = irongate_dma_get_tag; 111 t->_dmamap_create = isadma_bounce_dmamap_create; 112 t->_dmamap_destroy = isadma_bounce_dmamap_destroy; 113 t->_dmamap_load = isadma_bounce_dmamap_load; 114 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf; 115 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio; 116 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw; 117 t->_dmamap_unload = isadma_bounce_dmamap_unload; 118 t->_dmamap_sync = isadma_bounce_dmamap_sync; 119 120 t->_dmamem_alloc = isadma_bounce_dmamem_alloc; 121 t->_dmamem_free = _bus_dmamem_free; 122 t->_dmamem_map = _bus_dmamem_map; 123 t->_dmamem_unmap = _bus_dmamem_unmap; 124 t->_dmamem_mmap = _bus_dmamem_mmap; 125 126 /* XXX XXX BEGIN XXX XXX */ 127 { /* XXX */ 128 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 129 alpha_XXX_dmamap_or = 0; /* XXX */ 130 } /* XXX */ 131 /* XXX XXX END XXX XXX */ 132 } 133 134 /* 135 * Return the bus dma tag to be used for the specified bus type. 136 * INTERNAL USE ONLY! 137 */ 138 bus_dma_tag_t 139 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 140 { 141 struct irongate_config *icp = t->_cookie; 142 143 switch (bustype) { 144 case ALPHA_BUS_PCI: 145 case ALPHA_BUS_EISA: 146 /* 147 * Busses capable of 32-bit DMA get the PCI DMA tag. 148 */ 149 return (&icp->ic_dmat_pci); 150 151 case ALPHA_BUS_ISA: 152 /* 153 * Lame 24-bit busses have to bounce. 154 */ 155 return (&icp->ic_dmat_isa); 156 157 default: 158 panic("irongate_dma_get_tag: shouldn't be here, really..."); 159 } 160 } 161
Indexes created Mon Sep 29 03:10:08 GMT 2025