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iommu.c revision 1.2 
      1 /*	$NetBSD: iommu.c,v 1.2 1997/02/13 07:38:21 jeremy 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 #include <machine/obio.h>
     53 #include "iommu.h"
     54 
     55 #define OBIO_IOMMU_SIZE	(IOMMU_NENT * sizeof(iommu_pde_t))
     56 
     57 static int  iommu_match __P((struct device *, struct cfdata *, void *));
     58 static void iommu_attach __P((struct device *, struct device *, void *));
     59 
     60 struct cfattach iommu_ca = {
     61 	sizeof(struct device), iommu_match, iommu_attach
     62 };
     63 
     64 struct cfdriver iommu_cd = {
     65 	NULL, "iommu", DV_DULL
     66 };
     67 
     68 static iommu_pde_t *iommu_va;
     69 
     70 static int
     71 iommu_match(parent, cf, args)
     72 	struct device *parent;
     73 	struct cfdata *cf;
     74 	void *args;
     75 {
     76 	struct confargs *ca = args;
     77 
     78 	/* This driver only supports one unit. */
     79 	if (cf->cf_unit != 0)
     80 		return (0);
     81 
     82 	/* Validate the given address. */
     83 	if (ca->ca_paddr != OBIO_IOMMU)
     84 		return (0);
     85 
     86 	return (1);
     87 }
     88 
     89 static void
     90 iommu_attach(parent, self, args)
     91 	struct device *parent;
     92 	struct device *self;
     93 	void *args;
     94 {
     95 	struct confargs *ca = args;
     96 
     97 	iommu_va = (iommu_pde_t *)
     98 		obio_alloc(ca->ca_paddr, OBIO_IOMMU_SIZE);
     99 
    100 	printf("\n");
    101 }
    102 
    103 void
    104 iommu_enter(sa, pa)
    105 	u_int32_t sa;	/* slave address */
    106 	u_int32_t pa;	/* phys. address */
    107 {
    108 	int pn;
    109 
    110 #ifdef	DIAGNOSTIC
    111 	if (sa > (1<<24))
    112 		panic("iommu_enter: bad sa");
    113 #endif
    114 
    115 	/* Convert the slave address into a page index. */
    116 	pn = IOMMU_BTOP(sa);
    117 
    118 	/* Mask the physical address to insure it is page aligned */
    119 	pa &= IOMMU_PDE_PA;
    120 	pa |= IOMMU_PDE_DT_VALID;
    121 
    122 	iommu_va[pn].addr.raw = pa;
    123 }
    124 
    125 void
    126 iommu_remove(sa, len)
    127 	u_int32_t sa;	/* slave address */
    128 	u_int32_t len;
    129 {
    130 	int pn;
    131 
    132 #ifdef	DIAGNOSTIC
    133 	if (sa > (1<<24))
    134 		panic("iommu_enter: bad sa");
    135 #endif
    136 
    137 	pn = IOMMU_BTOP(sa);
    138 	while (len > 0) {
    139 		iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
    140 		len -= NBPG;
    141 	}
    142 }
    143