irongate_dma.c revision 1.3
1 /* $NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * DMA support for the AMD 751 (``Irongate'') core logic chipset. 41 * 42 * The AMD 751 is really unlike all of the other Alpha PCI core logic 43 * chipsets. Instead, it looks like a normal PC chipset (not surprising, 44 * since it is used for Athlon processors). 45 * 46 * Because of this, it lacks all of the SGMAP hardware normally present 47 * on an Alpha system, and there are no DMA windows. Instead, a memory 48 * bus address is a PCI DMA address, and ISA DMA above 16M has to be 49 * bounced (this is not unlike the Jensen, actually). 50 */ 51 52 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 53 54 __KERNEL_RCSID(0, "$NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg Exp $"); 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/kernel.h> 59 #include <sys/device.h> 60 #include <sys/malloc.h> 61 62 #include <uvm/uvm_extern.h> 63 64 #define _ALPHA_BUS_DMA_PRIVATE 65 #include <machine/bus.h> 66 67 #include <dev/pci/pcireg.h> 68 #include <dev/pci/pcivar.h> 69 70 #include <alpha/pci/irongatereg.h> 71 #include <alpha/pci/irongatevar.h> 72 73 #include <dev/isa/isareg.h> 74 #include <dev/isa/isavar.h> 75 76 bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 77 78 void 79 irongate_dma_init(struct irongate_config *icp) 80 { 81 bus_dma_tag_t t; 82 83 /* 84 * Initialize the DMA tag used for PCI DMA. 85 */ 86 t = &icp->ic_dmat_pci; 87 t->_cookie = icp; 88 t->_wbase = 0; 89 t->_wsize = 0x100000000UL; 90 t->_next_window = NULL; 91 t->_boundary = 0; 92 t->_sgmap = NULL; 93 t->_get_tag = irongate_dma_get_tag; 94 t->_dmamap_create = _bus_dmamap_create; 95 t->_dmamap_destroy = _bus_dmamap_destroy; 96 t->_dmamap_load = _bus_dmamap_load_direct; 97 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 98 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 99 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 100 t->_dmamap_unload = _bus_dmamap_unload; 101 t->_dmamap_sync = _bus_dmamap_sync; 102 103 t->_dmamem_alloc = _bus_dmamem_alloc; 104 t->_dmamem_free = _bus_dmamem_free; 105 t->_dmamem_map = _bus_dmamem_map; 106 t->_dmamem_unmap = _bus_dmamem_unmap; 107 t->_dmamem_mmap = _bus_dmamem_mmap; 108 109 /* 110 * Initialize the DMA tag used for ISA DMA. 111 */ 112 t = &icp->ic_dmat_isa; 113 t->_cookie = icp; 114 t->_wbase = 0; 115 t->_wsize = 0x1000000; 116 t->_next_window = NULL; 117 t->_boundary = 0; 118 t->_sgmap = NULL; 119 t->_get_tag = irongate_dma_get_tag; 120 t->_dmamap_create = isadma_bounce_dmamap_create; 121 t->_dmamap_destroy = isadma_bounce_dmamap_destroy; 122 t->_dmamap_load = isadma_bounce_dmamap_load; 123 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf; 124 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio; 125 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw; 126 t->_dmamap_unload = isadma_bounce_dmamap_unload; 127 t->_dmamap_sync = isadma_bounce_dmamap_sync; 128 129 t->_dmamem_alloc = isadma_bounce_dmamem_alloc; 130 t->_dmamem_free = _bus_dmamem_free; 131 t->_dmamem_map = _bus_dmamem_map; 132 t->_dmamem_unmap = _bus_dmamem_unmap; 133 t->_dmamem_mmap = _bus_dmamem_mmap; 134 135 /* XXX XXX BEGIN XXX XXX */ 136 { /* XXX */ 137 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 138 alpha_XXX_dmamap_or = 0; /* XXX */ 139 } /* XXX */ 140 /* XXX XXX END XXX XXX */ 141 } 142 143 /* 144 * Return the bus dma tag to be used for the specified bus type. 145 * INTERNAL USE ONLY! 146 */ 147 bus_dma_tag_t 148 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 149 { 150 struct irongate_config *icp = t->_cookie; 151 152 switch (bustype) { 153 case ALPHA_BUS_PCI: 154 case ALPHA_BUS_EISA: 155 /* 156 * Busses capable of 32-bit DMA get the PCI DMA tag. 157 */ 158 return (&icp->ic_dmat_pci); 159 160 case ALPHA_BUS_ISA: 161 /* 162 * Lame 24-bit busses have to bounce. 163 */ 164 return (&icp->ic_dmat_isa); 165 166 default: 167 panic("irongate_dma_get_tag: shouldn't be here, really..."); 168 } 169 } 170
Indexes created Mon Sep 29 03:10:08 GMT 2025