1 /* $NetBSD: irongate_dma.c,v 1.10 2021/07/04 22:42:36 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2020 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 1.10 2021/07/04 22:42:36 thorpej Exp $"); 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/device.h> 53 54 #define _ALPHA_BUS_DMA_PRIVATE 55 #include <sys/bus.h> 56 57 #include <dev/pci/pcireg.h> 58 #include <dev/pci/pcivar.h> 59 60 #include <alpha/pci/irongatereg.h> 61 #include <alpha/pci/irongatevar.h> 62 63 #include <dev/isa/isareg.h> 64 #include <dev/isa/isavar.h> 65 66 #include <machine/alpha.h> 67 68 static bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 69 70 void 71 irongate_page_physload(unsigned long const start_pfn, 72 unsigned long const end_pfn) 73 { 74 /* 75 * The Irongate does not have SGMAP DMA. For this reason, we 76 * need to protect the first 16MB of RAM from random allocations 77 * in order to give ISA DMA a snowball's chance of working. 78 */ 79 alpha_page_physload_sheltered(start_pfn, end_pfn, 80 0, alpha_btop(0x1000000)); 81 } 82 83 void 84 irongate_dma_init(struct irongate_config *icp) 85 { 86 bus_dma_tag_t t; 87 88 /* 89 * Initialize the DMA tag used for PCI DMA. 90 */ 91 t = &icp->ic_dmat_pci; 92 t->_cookie = icp; 93 t->_wbase = 0; 94 t->_wsize = 0x100000000UL; 95 t->_next_window = NULL; 96 t->_boundary = 0; 97 t->_sgmap = NULL; 98 t->_get_tag = irongate_dma_get_tag; 99 t->_dmamap_create = _bus_dmamap_create; 100 t->_dmamap_destroy = _bus_dmamap_destroy; 101 t->_dmamap_load = _bus_dmamap_load_direct; 102 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 103 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 104 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 105 t->_dmamap_unload = _bus_dmamap_unload; 106 t->_dmamap_sync = _bus_dmamap_sync; 107 108 t->_dmamem_alloc = _bus_dmamem_alloc; 109 t->_dmamem_free = _bus_dmamem_free; 110 t->_dmamem_map = _bus_dmamem_map; 111 t->_dmamem_unmap = _bus_dmamem_unmap; 112 t->_dmamem_mmap = _bus_dmamem_mmap; 113 114 /* 115 * Initialize the DMA tag used for ISA DMA. 116 */ 117 t = &icp->ic_dmat_isa; 118 t->_cookie = icp; 119 t->_wbase = 0; 120 t->_wsize = 0x1000000; 121 t->_next_window = NULL; 122 t->_boundary = 0; 123 t->_sgmap = NULL; 124 t->_get_tag = irongate_dma_get_tag; 125 t->_dmamap_create = isadma_bounce_dmamap_create; 126 t->_dmamap_destroy = isadma_bounce_dmamap_destroy; 127 t->_dmamap_load = isadma_bounce_dmamap_load; 128 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf; 129 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio; 130 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw; 131 t->_dmamap_unload = isadma_bounce_dmamap_unload; 132 t->_dmamap_sync = isadma_bounce_dmamap_sync; 133 134 t->_dmamem_alloc = isadma_bounce_dmamem_alloc; 135 t->_dmamem_free = _bus_dmamem_free; 136 t->_dmamem_map = _bus_dmamem_map; 137 t->_dmamem_unmap = _bus_dmamem_unmap; 138 t->_dmamem_mmap = _bus_dmamem_mmap; 139 } 140 141 /* 142 * Return the bus dma tag to be used for the specified bus type. 143 * INTERNAL USE ONLY! 144 */ 145 static bus_dma_tag_t 146 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 147 { 148 struct irongate_config *icp = t->_cookie; 149 150 switch (bustype) { 151 case ALPHA_BUS_PCI: 152 case ALPHA_BUS_EISA: 153 /* 154 * Busses capable of 32-bit DMA get the PCI DMA tag. 155 */ 156 return (&icp->ic_dmat_pci); 157 158 case ALPHA_BUS_ISA: 159 /* 160 * Lame 24-bit busses have to bounce. 161 */ 162 return (&icp->ic_dmat_isa); 163 164 default: 165 panic("irongate_dma_get_tag: shouldn't be here, really..."); 166 } 167 } 168
Indexes created Fri Sep 26 20:09:58 GMT 2025