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iommu.c revision 1.14 
      1 /*	$NetBSD: iommu.c,v 1.14 2005/01/22 15:36:10 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/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.14 2005/01/22 15:36:10 chs 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(struct device *, struct cfdata *, void *);
     62 static void iommu_attach(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(struct device *parent, struct cfdata *cf, void *args)
     71 {
     72 	/* This driver only supports one instance. */
     73 	if (iommu_va)
     74 		return (0);
     75 
     76 	return (1);
     77 }
     78 
     79 static void
     80 iommu_attach(struct device *parent, struct device *self, void *args)
     81 {
     82 	struct confargs *ca = args;
     83 
     84 	iommu_va = (iommu_pde_t *)
     85 		bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE);
     86 
     87 	printf("\n");
     88 }
     89 
     90 void
     91 iommu_enter(uint32_t sa, uint32_t pa)
     92 {
     93 	int pn;
     94 
     95 #ifdef	DIAGNOSTIC
     96 	if (sa > (1<<24))
     97 		panic("iommu_enter: bad sa");
     98 #endif
     99 
    100 	/* Convert the slave address into a page index. */
    101 	pn = IOMMU_BTOP(sa);
    102 
    103 	/* Mask the physical address to insure it is page aligned */
    104 	pa &= IOMMU_PDE_PA;
    105 	pa |= IOMMU_PDE_DT_VALID;
    106 
    107 	iommu_va[pn].addr.raw = pa;
    108 }
    109 
    110 void
    111 iommu_remove(uint32_t sa, uint32_t len)
    112 {
    113 	int pn;
    114 
    115 #ifdef	DIAGNOSTIC
    116 	if (sa > (1<<24))
    117 		panic("iommu_enter: bad sa");
    118 #endif
    119 
    120 	pn = IOMMU_BTOP(sa);
    121 	while (len > 0) {
    122 		iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
    123 		len -= IOMMU_PAGE_SIZE;
    124 	}
    125 }
    126