1/* $NetBSD: iommu.c,v 1.19 2023/12/20 05:18:00 thorpej 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 1.19 2023/12/20 05:18:00 thorpej 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/proc.h> 45 46#include <machine/autoconf.h> 47 48#include <sun3/sun3x/iommu.h> 49#include <sun3/sun3x/obio.h> 50 51#define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t)) 52 53static int iommu_match(device_t, cfdata_t, void *); 54static void iommu_attach(device_t, device_t, void *); 55 56CFATTACH_DECL_NEW(iommu, 0, 57 iommu_match, iommu_attach, NULL, NULL); 58 59static iommu_pde_t *iommu_va; 60 61static int 62iommu_match(device_t parent, cfdata_t cf, void *args) 63{ 64 /* This driver only supports one instance. */ 65 if (iommu_va) 66 return 0; 67 68 return 1; 69} 70 71static void 72iommu_attach(device_t parent, device_t self, void *args) 73{ 74 struct confargs *ca = args; 75 76 iommu_va = (iommu_pde_t *)bus_mapin(ca->ca_bustype, ca->ca_paddr, 77 IOMMU_SIZE); 78 79 aprint_normal("\n"); 80} 81 82void 83iommu_enter(uint32_t sa, uint32_t pa) 84{ 85 int pn; 86 87#ifdef DIAGNOSTIC 88 if (sa > (1<<24)) 89 panic("%s: bad sa", __func__); 90#endif 91 92 /* Convert the slave address into a page index. */ 93 pn = IOMMU_BTOP(sa); 94 95 /* Mask the physical address to insure it is page aligned */ 96 pa &= IOMMU_PDE_PA; 97 pa |= IOMMU_PDE_DT_VALID; 98 99 iommu_va[pn].addr.raw = pa; 100} 101 102void 103iommu_remove(uint32_t sa, uint32_t len) 104{ 105 int pn; 106 107#ifdef DIAGNOSTIC 108 if (sa > (1<<24)) 109 panic("%s: bad sa", __func__); 110#endif 111 112 pn = IOMMU_BTOP(sa); 113 while (len > 0) { 114 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID; 115 len -= IOMMU_PAGE_SIZE; 116 } 117} 118