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iommu.c revision 1.9 
      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