1 /* $NetBSD: iommu.c,v 1.8 1998/02/05 04:57:57 gwr 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 74 /* This driver only supports one unit. */ 75 if (cf->cf_unit != 0) 76 return (0); 77 78 return (1); 79 } 80 81 static void 82 iommu_attach(parent, self, args) 83 struct device *parent; 84 struct device *self; 85 void *args; 86 { 87 struct confargs *ca = args; 88 89 iommu_va = (iommu_pde_t *) 90 bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE); 91 92 printf("\n"); 93 } 94 95 void 96 iommu_enter(sa, pa) 97 u_int32_t sa; /* slave address */ 98 u_int32_t pa; /* phys. address */ 99 { 100 int pn; 101 102 #ifdef DIAGNOSTIC 103 if (sa > (1<<24)) 104 panic("iommu_enter: bad sa"); 105 #endif 106 107 /* Convert the slave address into a page index. */ 108 pn = IOMMU_BTOP(sa); 109 110 /* Mask the physical address to insure it is page aligned */ 111 pa &= IOMMU_PDE_PA; 112 pa |= IOMMU_PDE_DT_VALID; 113 114 iommu_va[pn].addr.raw = pa; 115 } 116 117 void 118 iommu_remove(sa, len) 119 u_int32_t sa; /* slave address */ 120 u_int32_t len; 121 { 122 int pn; 123 124 #ifdef DIAGNOSTIC 125 if (sa > (1<<24)) 126 panic("iommu_enter: bad sa"); 127 #endif 128 129 pn = IOMMU_BTOP(sa); 130 while (len > 0) { 131 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID; 132 len -= IOMMU_PAGE_SIZE; 133 } 134 } 135