1 /* $NetBSD: iommu.c,v 1.15 2005/12/11 12:19:27 christos 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/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.15 2005/12/11 12:19:27 christos Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/device.h> 49 #include <sys/conf.h> 50 #include <sys/buf.h> 51 #include <sys/malloc.h> 52 #include <sys/proc.h> 53 54 #include <machine/autoconf.h> 55 56 #include <sun3/sun3x/iommu.h> 57 #include <sun3/sun3x/obio.h> 58 59 #define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t)) 60 61 static int iommu_match(struct device *, struct cfdata *, void *); 62 static void iommu_attach(struct device *, struct device *, void *); 63 64 CFATTACH_DECL(iommu, sizeof(struct device), 65 iommu_match, iommu_attach, NULL, NULL); 66 67 static iommu_pde_t *iommu_va; 68 69 static int 70 iommu_match(struct device *parent, struct cfdata *cf, void *args) 71 { 72 /* This driver only supports one instance. */ 73 if (iommu_va) 74 return (0); 75 76 return (1); 77 } 78 79 static void 80 iommu_attach(struct device *parent, struct device *self, void *args) 81 { 82 struct confargs *ca = args; 83 84 iommu_va = (iommu_pde_t *) 85 bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE); 86 87 printf("\n"); 88 } 89 90 void 91 iommu_enter(uint32_t sa, uint32_t pa) 92 { 93 int pn; 94 95 #ifdef DIAGNOSTIC 96 if (sa > (1<<24)) 97 panic("iommu_enter: bad sa"); 98 #endif 99 100 /* Convert the slave address into a page index. */ 101 pn = IOMMU_BTOP(sa); 102 103 /* Mask the physical address to insure it is page aligned */ 104 pa &= IOMMU_PDE_PA; 105 pa |= IOMMU_PDE_DT_VALID; 106 107 iommu_va[pn].addr.raw = pa; 108 } 109 110 void 111 iommu_remove(uint32_t sa, uint32_t len) 112 { 113 int pn; 114 115 #ifdef DIAGNOSTIC 116 if (sa > (1<<24)) 117 panic("iommu_enter: bad sa"); 118 #endif 119 120 pn = IOMMU_BTOP(sa); 121 while (len > 0) { 122 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID; 123 len -= IOMMU_PAGE_SIZE; 124 } 125 } 126