sys/arch/sun3/sun3x/iommu.c

   1 /*      $NetBSD: iommu.c,v 1.16 2008/04/28 20:23:38 martin 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 1.16 2008/04/28 20:23:38 martin 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/malloc.h>
  45 #include <sys/proc.h>
  46
  47 #include <machine/autoconf.h>
  48
  49 #include <sun3/sun3x/iommu.h>
  50 #include <sun3/sun3x/obio.h>
  51
  52 #define IOMMU_SIZE      (IOMMU_NENT * sizeof(iommu_pde_t))
  53
  54 static int  iommu_match(device_t, cfdata_t, void *);
  55 static void iommu_attach(device_t, device_t, void *);
  56
  57 CFATTACH_DECL_NEW(iommu, 0,
  58     iommu_match, iommu_attach, NULL, NULL);
  59
  60 static iommu_pde_t *iommu_va;
  61
  62 static int
  63 iommu_match(device_t parent, cfdata_t cf, void *args)
  64 {
  65         /* This driver only supports one instance. */
  66         if (iommu_va)
  67                 return 0;
  68
  69         return 1;
  70 }
  71
  72 static void
  73 iommu_attach(device_t parent, device_t self, void *args)
  74 {
  75         struct confargs *ca = args;
  76
  77         iommu_va = (iommu_pde_t *)bus_mapin(ca->ca_bustype, ca->ca_paddr,
  78             IOMMU_SIZE);
  79
  80         aprint_normal("\n");
  81 }
  82
  83 void
  84 iommu_enter(uint32_t sa, uint32_t pa)
  85 {
  86         int pn;
  87
  88 #ifdef  DIAGNOSTIC
  89         if (sa > (1<<24))
  90                 panic("%s: bad sa", __func__);
  91 #endif
  92
  93         /* Convert the slave address into a page index. */
  94         pn = IOMMU_BTOP(sa);
  95
  96         /* Mask the physical address to insure it is page aligned */
  97         pa &= IOMMU_PDE_PA;
  98         pa |= IOMMU_PDE_DT_VALID;
  99
 100         iommu_va[pn].addr.raw = pa;
 101 }
 102
 103 void
 104 iommu_remove(uint32_t sa, uint32_t len)
 105 {
 106         int pn;
 107
 108 #ifdef  DIAGNOSTIC
 109         if (sa > (1<<24))
 110                 panic("%s: bad sa", __func__);
 111 #endif
 112
 113         pn = IOMMU_BTOP(sa);
 114         while (len > 0) {
 115                 iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
 116                 len -= IOMMU_PAGE_SIZE;
 117         }
 118 }