1 /* $NetBSD: iommu.c,v 1.9 2001/05/27 06:35:03 chs Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jeremy Cooper. 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 * Set-up functions for the Sun3x DVMA I/O Mapper. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/conf.h> 47 #include <sys/buf.h> 48 #include <sys/malloc.h> 49 #include <sys/proc.h> 50 51 #include <machine/autoconf.h> 52 53 #include <sun3/sun3x/iommu.h> 54 #include <sun3/sun3x/obio.h> 55 56 #define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t)) 57 58 static int iommu_match __P((struct device *, struct cfdata *, void *)); 59 static void iommu_attach __P((struct device *, struct device *, void *)); 60 61 struct cfattach iommu_ca = { 62 sizeof(struct device), iommu_match, iommu_attach 63 }; 64 65 static iommu_pde_t *iommu_va; 66 67 static int 68 iommu_match(parent, cf, args) 69 struct device *parent; 70 struct cfdata *cf; 71 void *args; 72 { 73 /* This driver only supports one instance. */ 74 if (iommu_va) 75 return (0); 76 77 return (1); 78 } 79 80 static void 81 iommu_attach(parent, self, args) 82 struct device *parent; 83 struct device *self; 84 void *args; 85 { 86 struct confargs *ca = args; 87 88 iommu_va = (iommu_pde_t *) 89 bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE); 90 91 printf("\n"); 92 } 93 94 void 95 iommu_enter(sa, pa) 96 u_int32_t sa; /* slave address */ 97 u_int32_t pa; /* phys. address */ 98 { 99 int pn; 100 101 #ifdef DIAGNOSTIC 102 if (sa > (1<<24)) 103 panic("iommu_enter: bad sa"); 104 #endif 105 106 /* Convert the slave address into a page index. */ 107 pn = IOMMU_BTOP(sa); 108 109 /* Mask the physical address to insure it is page aligned */ 110 pa &= IOMMU_PDE_PA; 111 pa |= IOMMU_PDE_DT_VALID; 112 113 iommu_va[pn].addr.raw = pa; 114 } 115 116 void 117 iommu_remove(sa, len) 118 u_int32_t sa; /* slave address */ 119 u_int32_t len; 120 { 121 int pn; 122 123 #ifdef DIAGNOSTIC 124 if (sa > (1<<24)) 125 panic("iommu_enter: bad sa"); 126 #endif 127 128 pn = IOMMU_BTOP(sa); 129 while (len > 0) { 130 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID; 131 len -= IOMMU_PAGE_SIZE; 132 } 133 } 134