1 /* $OpenBSD: irongate_dma.c,v 1.5 2008/06/26 05:42:08 ray Exp $ */ 2 /* $NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg Exp $ */ 3 4 /*- 5 * Copyright (c) 2000 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * DMA support for the AMD 751 (``Irongate'') core logic chipset. 35 * 36 * The AMD 751 is really unlike all of the other Alpha PCI core logic 37 * chipsets. Instead, it looks like a normal PC chipset (not surprising, 38 * since it is used for Athlon processors). 39 * 40 * Because of this, it lacks all of the SGMAP hardware normally present 41 * on an Alpha system, and there are no DMA windows. Instead, a memory 42 * bus address is a PCI DMA address, and ISA DMA above 16M has to be 43 * bounced (this is not unlike the Jensen, actually). 44 */ 45 46 /* 47 * XXX - We should define this before including bus.h, but since other stuff 48 * pulls in bus.h we must do this here. 49 */ 50 #define _ALPHA_BUS_DMA_PRIVATE 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/device.h> 56 #include <sys/malloc.h> 57 58 #include <uvm/uvm_extern.h> 59 60 #include <machine/bus.h> 61 62 #include <dev/pci/pcireg.h> 63 #include <dev/pci/pcivar.h> 64 65 #include <alpha/pci/irongatereg.h> 66 #include <alpha/pci/irongatevar.h> 67 68 #include <dev/isa/isareg.h> 69 #include <dev/isa/isavar.h> 70 71 #include "isadma.h" 72 73 bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 74 75 void 76 irongate_dma_init(struct irongate_config *icp) 77 { 78 bus_dma_tag_t t; 79 80 /* 81 * Initialize the DMA tag used for PCI DMA. 82 */ 83 t = &icp->ic_dmat_pci; 84 t->_cookie = icp; 85 t->_wbase = 0; 86 t->_wsize = 0x100000000UL; 87 t->_next_window = NULL; 88 t->_boundary = 0; 89 t->_sgmap = NULL; 90 t->_get_tag = irongate_dma_get_tag; 91 t->_dmamap_create = _bus_dmamap_create; 92 t->_dmamap_destroy = _bus_dmamap_destroy; 93 t->_dmamap_load = _bus_dmamap_load_direct; 94 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 95 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 96 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 97 t->_dmamap_unload = _bus_dmamap_unload; 98 t->_dmamap_sync = _bus_dmamap_sync; 99 100 t->_dmamem_alloc = _bus_dmamem_alloc; 101 t->_dmamem_free = _bus_dmamem_free; 102 t->_dmamem_map = _bus_dmamem_map; 103 t->_dmamem_unmap = _bus_dmamem_unmap; 104 t->_dmamem_mmap = _bus_dmamem_mmap; 105 106 #if NISADMA > 0 107 /* 108 * Initialize the DMA tag used for ISA DMA. 109 */ 110 t = &icp->ic_dmat_isa; 111 t->_cookie = icp; 112 t->_wbase = 0; 113 t->_wsize = 0x1000000; 114 t->_next_window = NULL; 115 t->_boundary = 0; 116 t->_sgmap = NULL; 117 t->_get_tag = irongate_dma_get_tag; 118 t->_dmamap_create = isadma_bounce_dmamap_create; 119 t->_dmamap_destroy = isadma_bounce_dmamap_destroy; 120 t->_dmamap_load = isadma_bounce_dmamap_load; 121 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf; 122 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio; 123 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw; 124 t->_dmamap_unload = isadma_bounce_dmamap_unload; 125 t->_dmamap_sync = isadma_bounce_dmamap_sync; 126 127 t->_dmamem_alloc = isadma_bounce_dmamem_alloc; 128 t->_dmamem_free = _bus_dmamem_free; 129 t->_dmamem_map = _bus_dmamem_map; 130 t->_dmamem_unmap = _bus_dmamem_unmap; 131 t->_dmamem_mmap = _bus_dmamem_mmap; 132 #endif 133 134 /* XXX XXX BEGIN XXX XXX */ 135 { /* XXX */ 136 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 137 alpha_XXX_dmamap_or = 0; /* XXX */ 138 } /* XXX */ 139 /* XXX XXX END XXX XXX */ 140 } 141 142 /* 143 * Return the bus dma tag to be used for the specified bus type. 144 * INTERNAL USE ONLY! 145 */ 146 bus_dma_tag_t 147 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 148 { 149 struct irongate_config *icp = t->_cookie; 150 151 switch (bustype) { 152 case ALPHA_BUS_PCI: 153 case ALPHA_BUS_EISA: 154 /* 155 * Busses capable of 32-bit DMA get the PCI DMA tag. 156 */ 157 return (&icp->ic_dmat_pci); 158 159 case ALPHA_BUS_ISA: 160 /* 161 * Lame 24-bit busses have to bounce. 162 */ 163 return (&icp->ic_dmat_isa); 164 165 default: 166 panic("irongate_dma_get_tag: shouldn't be here, really..."); 167 } 168 } 169