1 /* $NetBSD: iommu.c,v 1.17 2008/06/28 12:13:38 tsutsui 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 * 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 * Set-up functions for the Sun3x DVMA I/O Mapper. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.17 2008/06/28 12:13:38 tsutsui Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/conf.h> 43 #include <sys/buf.h> 44 #include <sys/malloc.h> 45 #include <sys/proc.h> 46 47 #include <machine/autoconf.h> 48 49 #include <sun3/sun3x/iommu.h> 50 #include <sun3/sun3x/obio.h> 51 52 #define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t)) 53 54 static int iommu_match(device_t, cfdata_t, void *); 55 static void iommu_attach(device_t, device_t, void *); 56 57 CFATTACH_DECL_NEW(iommu, 0, 58 iommu_match, iommu_attach, NULL, NULL); 59 60 static iommu_pde_t *iommu_va; 61 62 static int 63 iommu_match(device_t parent, cfdata_t cf, void *args) 64 { 65 /* This driver only supports one instance. */ 66 if (iommu_va) 67 return 0; 68 69 return 1; 70 } 71 72 static void 73 iommu_attach(device_t parent, device_t self, void *args) 74 { 75 struct confargs *ca = args; 76 77 iommu_va = (iommu_pde_t *)bus_mapin(ca->ca_bustype, ca->ca_paddr, 78 IOMMU_SIZE); 79 80 aprint_normal("\n"); 81 } 82 83 void 84 iommu_enter(uint32_t sa, uint32_t pa) 85 { 86 int pn; 87 88 #ifdef DIAGNOSTIC 89 if (sa > (1<<24)) 90 panic("%s: bad sa", __func__); 91 #endif 92 93 /* Convert the slave address into a page index. */ 94 pn = IOMMU_BTOP(sa); 95 96 /* Mask the physical address to insure it is page aligned */ 97 pa &= IOMMU_PDE_PA; 98 pa |= IOMMU_PDE_DT_VALID; 99 100 iommu_va[pn].addr.raw = pa; 101 } 102 103 void 104 iommu_remove(uint32_t sa, uint32_t len) 105 { 106 int pn; 107 108 #ifdef DIAGNOSTIC 109 if (sa > (1<<24)) 110 panic("%s: bad sa", __func__); 111 #endif 112 113 pn = IOMMU_BTOP(sa); 114 while (len > 0) { 115 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID; 116 len -= IOMMU_PAGE_SIZE; 117 } 118 } 119