jensenio_dma.c revision 1.1
1 /* $NetBSD: jensenio_dma.c,v 1.1 2000/07/12 20:36:09 thorpej 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 Jensen system. 41 * 42 * The Jensen uses direct-mapped DMA with a window base of 0, i.e. 43 * a page of phyical memory has the same PCI address as CPU address. 44 * There is no support for SGMAPs on the Jensen. This means that for 45 * ISA DMA, we must employ bounce buffers for DMA transactions over 46 * 16MB ISA limit (due to ISA's 24-bit address space limitation). 47 * 48 * Furthermore, the H_BUS will not respond to DMA transactions between 49 * 512KB and 1MB. This is to allow for the ISA `hole'. However, the 50 * ISA `hole' typically exists only between 640KB and 1MB. We must 51 * therefore bounce transactions that fall within this region, as well. 52 * XXX Should we prevent having managed memory in this region, instead? 53 */ 54 55 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 56 57 __KERNEL_RCSID(0, "$NetBSD: jensenio_dma.c,v 1.1 2000/07/12 20:36:09 thorpej Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/kernel.h> 62 #include <sys/device.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 66 #define _ALPHA_BUS_DMA_PRIVATE 67 #include <machine/bus.h> 68 69 #include <dev/eisa/eisavar.h> 70 71 #include <dev/isa/isavar.h> 72 73 #include <alpha/jensenio/jenseniovar.h> 74 75 bus_dma_tag_t jensenio_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 76 77 void 78 jensenio_dma_init(struct jensenio_config *jcp) 79 { 80 bus_dma_tag_t t; 81 82 /* 83 * Initialize the DMA tag used for EISA DMA. 84 */ 85 t = &jcp->jc_dmat_eisa; 86 t->_cookie = jcp; 87 t->_wbase = 0; 88 t->_wsize = 0x100000000UL; 89 t->_next_window = NULL; 90 t->_boundary = 0; 91 t->_sgmap = NULL; 92 t->_get_tag = jensenio_dma_get_tag; 93 t->_dmamap_create = _bus_dmamap_create; 94 t->_dmamap_destroy = _bus_dmamap_destroy; 95 t->_dmamap_load = _bus_dmamap_load_direct; 96 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 97 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 98 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 99 t->_dmamap_unload = _bus_dmamap_unload; 100 t->_dmamap_sync = _bus_dmamap_sync; 101 102 t->_dmamem_alloc = _bus_dmamem_alloc; 103 t->_dmamem_free = _bus_dmamem_free; 104 t->_dmamem_map = _bus_dmamem_map; 105 t->_dmamem_unmap = _bus_dmamem_unmap; 106 t->_dmamem_mmap = _bus_dmamem_mmap; 107 108 /* 109 * Initialize the DMA tag used for ISA DMA. 110 */ 111 t = &jcp->jc_dmat_isa; 112 t->_cookie = jcp; 113 t->_wbase = 0; 114 t->_wsize = 0x1000000; 115 t->_next_window = NULL; 116 t->_boundary = 0; 117 t->_sgmap = NULL; 118 t->_get_tag = jensenio_dma_get_tag; 119 t->_dmamap_create = isadma_bounce_dmamap_create; 120 t->_dmamap_destroy = isadma_bounce_dmamap_destroy; 121 t->_dmamap_load = isadma_bounce_dmamap_load; 122 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf; 123 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio; 124 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw; 125 t->_dmamap_unload = isadma_bounce_dmamap_unload; 126 t->_dmamap_sync = isadma_bounce_dmamap_sync; 127 128 t->_dmamem_alloc = isadma_bounce_dmamem_alloc; 129 t->_dmamem_free = _bus_dmamem_free; 130 t->_dmamem_map = _bus_dmamem_map; 131 t->_dmamem_unmap = _bus_dmamem_unmap; 132 t->_dmamem_mmap = _bus_dmamem_mmap; 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 } 139 } 140 141 /* 142 * Return the bus dma tag to be used fo rthe specified bus type. 143 * INTERNAL USE ONLY! 144 */ 145 bus_dma_tag_t 146 jensenio_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 147 { 148 struct jensenio_config *jcp = t->_cookie; 149 150 switch (bustype) { 151 case ALPHA_BUS_EISA: 152 /* 153 * Busses capable of 32-bit DMA get the EISA DMA tag. 154 */ 155 return (&jcp->jc_dmat_eisa); 156 157 case ALPHA_BUS_ISA: 158 /* 159 * Lame 24-bit busses have to bounce. 160 */ 161 return (&jcp->jc_dmat_isa); 162 163 default: 164 panic("jensenio_dma_get_tag: shouldn't be here, really..."); 165 } 166 } 167
Indexes created Wed Oct 01 07:09:59 GMT 2025