1 /* $NetBSD: bus_subr.c,v 1.25 2003/07/15 03:36:19 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 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 * 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 * bus_xxx support functions, Sun3X-specific part. 41 * The common stuff is in autoconf.c 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: bus_subr.c,v 1.25 2003/07/15 03:36:19 lukem Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 51 #include <uvm/uvm_extern.h> 52 53 #include <machine/autoconf.h> 54 #include <machine/cpu.h> 55 #include <machine/mon.h> 56 #include <machine/pmap.h> 57 #include <machine/pte.h> 58 59 #include <sun3/sun3/machdep.h> 60 #include <sun3/sun3x/vme.h> 61 62 label_t *nofault; 63 64 /* These are defined in pmap.c */ 65 extern vaddr_t tmp_vpages[]; 66 extern int tmp_vpages_inuse; 67 68 static const struct { 69 long base; 70 long mask; 71 } bus_info[BUS__NTYPES] = { 72 { /* OBIO */ 0, ~0 }, 73 { /* OBMEM */ 0, ~0 }, 74 /* VME A16 */ 75 { VME16D16_BASE, VME16_MASK }, 76 { VME16D32_BASE, VME16_MASK }, 77 /* VME A24 */ 78 { VME24D16_BASE, VME24_MASK }, 79 { VME24D32_BASE, VME24_MASK }, 80 /* VME A32 */ 81 { VME32D16_BASE, VME32_MASK }, 82 { VME32D32_BASE, VME32_MASK }, 83 }; 84 85 /* 86 * Create a temporary, one-page mapping for a device. 87 * This is used by some device probe routines that 88 * need to do peek/write/read tricks. 89 */ 90 void * 91 bus_tmapin(bustype, pa) 92 int bustype, pa; 93 { 94 vaddr_t pgva; 95 int off, s; 96 97 if ((bustype < 0) || (bustype >= BUS__NTYPES)) 98 panic("bus_tmapin: bustype"); 99 100 off = pa & PGOFSET; 101 pa -= off; 102 103 pa &= bus_info[bustype].mask; 104 pa |= bus_info[bustype].base; 105 pa |= PMAP_NC; 106 107 s = splvm(); 108 if (tmp_vpages_inuse) 109 panic("bus_tmapin: tmp_vpages_inuse"); 110 tmp_vpages_inuse++; 111 112 pgva = tmp_vpages[1]; 113 pmap_kenter_pa(pgva, pa, VM_PROT_READ | VM_PROT_WRITE); 114 pmap_update(pmap_kernel()); 115 splx(s); 116 117 return ((void *)(pgva + off)); 118 } 119 120 void bus_tmapout(vp) 121 void *vp; 122 { 123 vaddr_t pgva; 124 int s; 125 126 pgva = m68k_trunc_page(vp); 127 if (pgva != tmp_vpages[1]) 128 return; 129 130 s = splvm(); 131 pmap_kremove(pgva, PAGE_SIZE); 132 pmap_update(pmap_kernel()); 133 --tmp_vpages_inuse; 134 splx(s); 135 } 136 137 /* 138 * Make a permanent mapping for a device. 139 */ 140 void * 141 bus_mapin(bustype, pa, sz) 142 int bustype, pa, sz; 143 { 144 vaddr_t va; 145 int off; 146 147 if ((bustype < 0) || (bustype >= BUS__NTYPES)) 148 panic("bus_mapin: bustype"); 149 150 off = pa & PGOFSET; 151 pa -= off; 152 sz += off; 153 sz = m68k_round_page(sz); 154 155 /* Borrow PROM mappings if we can. */ 156 if (bustype == BUS_OBIO) { 157 va = (vaddr_t) obio_find_mapping(pa, sz); 158 if (va != 0) 159 goto done; 160 } 161 162 pa &= bus_info[bustype].mask; 163 pa |= bus_info[bustype].base; 164 pa |= PMAP_NC; /* non-cached */ 165 166 /* Get some kernel virtual address space. */ 167 va = uvm_km_valloc_wait(kernel_map, sz); 168 if (va == 0) 169 panic("bus_mapin"); 170 171 /* Map it to the specified bus. */ 172 pmap_map(va, pa, pa + sz, VM_PROT_ALL); 173 174 done: 175 return ((void*)(va + off)); 176 } 177 178 void 179 bus_mapout(ptr, sz) 180 void *ptr; 181 int sz; 182 { 183 vaddr_t va; 184 int off; 185 186 va = (vaddr_t)ptr; 187 188 /* If it was a PROM mapping, do NOT free it! */ 189 if ((va >= SUN3X_MONSTART) && (va < SUN3X_MONEND)) 190 return; 191 192 off = va & PGOFSET; 193 va -= off; 194 sz += off; 195 sz = m68k_round_page(sz); 196 197 uvm_km_free_wakeup(kernel_map, va, sz); 198 } 199