Home | History | Annotate | Line # | Download | only in sun3x
iommu.c revision 1.13 
      1 /*	$NetBSD: iommu.c,v 1.13 2003/07/15 03:36:20 lukem 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 1.13 2003/07/15 03:36:20 lukem 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 __P((struct device *, struct cfdata *, void *));
     62 static void iommu_attach __P((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(parent, cf, args)
     71 	struct device *parent;
     72 	struct cfdata *cf;
     73 	void *args;
     74 {
     75 	/* This driver only supports one instance. */
     76 	if (iommu_va)
     77 		return (0);
     78 
     79 	return (1);
     80 }
     81 
     82 static void
     83 iommu_attach(parent, self, args)
     84 	struct device *parent;
     85 	struct device *self;
     86 	void *args;
     87 {
     88 	struct confargs *ca = args;
     89 
     90 	iommu_va = (iommu_pde_t *)
     91 		bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE);
     92 
     93 	printf("\n");
     94 }
     95 
     96 void
     97 iommu_enter(sa, pa)
     98 	u_int32_t sa;	/* slave address */
     99 	u_int32_t pa;	/* phys. address */
    100 {
    101 	int pn;
    102 
    103 #ifdef	DIAGNOSTIC
    104 	if (sa > (1<<24))
    105 		panic("iommu_enter: bad sa");
    106 #endif
    107 
    108 	/* Convert the slave address into a page index. */
    109 	pn = IOMMU_BTOP(sa);
    110 
    111 	/* Mask the physical address to insure it is page aligned */
    112 	pa &= IOMMU_PDE_PA;
    113 	pa |= IOMMU_PDE_DT_VALID;
    114 
    115 	iommu_va[pn].addr.raw = pa;
    116 }
    117 
    118 void
    119 iommu_remove(sa, len)
    120 	u_int32_t sa;	/* slave address */
    121 	u_int32_t len;
    122 {
    123 	int pn;
    124 
    125 #ifdef	DIAGNOSTIC
    126 	if (sa > (1<<24))
    127 		panic("iommu_enter: bad sa");
    128 #endif
    129 
    130 	pn = IOMMU_BTOP(sa);
    131 	while (len > 0) {
    132 		iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
    133 		len -= IOMMU_PAGE_SIZE;
    134 	}
    135 }
    136