sys/arch/sun3/sun3x/bus_subr.c

   1 /*      $NetBSD: bus_subr.c,v 1.31 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 Adam Glass and Gordon W. Ross.
   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  * bus_xxx support functions, Sun3X-specific part.
  34  * The common stuff is in autoconf.c
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: bus_subr.c,v 1.31 2008/04/28 20:23:38 martin Exp $");
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/device.h>
  43
  44 #include <uvm/uvm_extern.h>
  45
  46 #include <machine/autoconf.h>
  47 #include <machine/cpu.h>
  48 #include <machine/mon.h>
  49 #include <machine/pmap.h>
  50 #include <machine/pte.h>
  51
  52 #include <sun3/sun3/machdep.h>
  53 #include <sun3/sun3x/vme.h>
  54
  55 label_t *nofault;
  56
  57 /* These are defined in pmap.c */
  58 extern vaddr_t tmp_vpages[];
  59 extern int tmp_vpages_inuse;
  60
  61 static const struct {
  62         long base;
  63         long mask;
  64 } bus_info[BUS__NTYPES] = {
  65         { /* OBIO  */ 0, ~0 },
  66         { /* OBMEM */ 0, ~0 },
  67         /* VME A16 */
  68         { VME16D16_BASE, VME16_MASK },
  69         { VME16D32_BASE, VME16_MASK },
  70         /* VME A24 */
  71         { VME24D16_BASE, VME24_MASK },
  72         { VME24D32_BASE, VME24_MASK },
  73         /* VME A32 */
  74         { VME32D16_BASE, VME32_MASK },
  75         { VME32D32_BASE, VME32_MASK },
  76 };
  77
  78 /*
  79  * Create a temporary, one-page mapping for a device.
  80  * This is used by some device probe routines that
  81  * need to do peek/write/read tricks.
  82  */
  83 void *
  84 bus_tmapin(int bustype, int pa)
  85 {
  86         vaddr_t pgva;
  87         int off, s;
  88
  89         if ((bustype < 0) || (bustype >= BUS__NTYPES))
  90                 panic("bus_tmapin: bustype");
  91
  92         off = pa & PGOFSET;
  93         pa -= off;
  94
  95         pa &= bus_info[bustype].mask;
  96         pa |= bus_info[bustype].base;
  97         pa |= PMAP_NC;
  98
  99         s = splvm();
 100         if (tmp_vpages_inuse)
 101                 panic("bus_tmapin: tmp_vpages_inuse");
 102         tmp_vpages_inuse++;
 103
 104         pgva = tmp_vpages[1];
 105         pmap_kenter_pa(pgva, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 106         pmap_update(pmap_kernel());
 107         splx(s);
 108
 109         return ((void *)(pgva + off));
 110 }
 111
 112 void
 113 bus_tmapout(void *vp)
 114 {
 115         vaddr_t pgva;
 116         int s;
 117
 118         pgva = m68k_trunc_page(vp);
 119         if (pgva != tmp_vpages[1])
 120                 return;
 121
 122         s = splvm();
 123         pmap_kremove(pgva, PAGE_SIZE);
 124         pmap_update(pmap_kernel());
 125         --tmp_vpages_inuse;
 126         splx(s);
 127 }
 128
 129 /*
 130  * Make a permanent mapping for a device.
 131  */
 132 void *
 133 bus_mapin(int bustype, int pa, int sz)
 134 {
 135         vaddr_t va;
 136         int off;
 137
 138         if ((bustype < 0) || (bustype >= BUS__NTYPES))
 139                 panic("bus_mapin: bustype");
 140
 141         off = pa & PGOFSET;
 142         pa -= off;
 143         sz += off;
 144         sz = m68k_round_page(sz);
 145
 146         /* Borrow PROM mappings if we can. */
 147         if (bustype == BUS_OBIO) {
 148                 if (find_prom_map(pa, PMAP_OBIO, sz, &va) == 0)
 149                         goto done;
 150         }
 151
 152         pa &= bus_info[bustype].mask;
 153         pa |= bus_info[bustype].base;
 154         pa |= PMAP_NC;  /* non-cached */
 155
 156         /* Get some kernel virtual address space. */
 157         va = uvm_km_alloc(kernel_map, sz, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
 158         if (va == 0)
 159                 panic("bus_mapin");
 160
 161         /* Map it to the specified bus. */
 162         pmap_map(va, pa, pa + sz, VM_PROT_ALL);
 163
 164 done:
 165         return ((void*)(va + off));
 166 }
 167
 168 void
 169 bus_mapout(void *ptr, int sz)
 170 {
 171         vaddr_t va;
 172         int off;
 173
 174         va = (vaddr_t)ptr;
 175
 176         /* If it was a PROM mapping, do NOT free it! */
 177         if ((va >= SUN3X_MONSTART) && (va < SUN3X_MONEND))
 178                 return;
 179
 180         off = va & PGOFSET;
 181         va -= off;
 182         sz += off;
 183         sz = m68k_round_page(sz);
 184
 185         pmap_remove(pmap_kernel(), va, va + sz);
 186         pmap_update(pmap_kernel());
 187         uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY);
 188 }