1 /* $NetBSD: bus_subr.c,v 1.28 2005/12/11 12:19:27 christos 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 1.28 2005/12/11 12:19:27 christos 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(int bustype, int pa) 92 { 93 vaddr_t pgva; 94 int off, s; 95 96 if ((bustype < 0) || (bustype >= BUS__NTYPES)) 97 panic("bus_tmapin: bustype"); 98 99 off = pa & PGOFSET; 100 pa -= off; 101 102 pa &= bus_info[bustype].mask; 103 pa |= bus_info[bustype].base; 104 pa |= PMAP_NC; 105 106 s = splvm(); 107 if (tmp_vpages_inuse) 108 panic("bus_tmapin: tmp_vpages_inuse"); 109 tmp_vpages_inuse++; 110 111 pgva = tmp_vpages[1]; 112 pmap_kenter_pa(pgva, pa, VM_PROT_READ | VM_PROT_WRITE); 113 pmap_update(pmap_kernel()); 114 splx(s); 115 116 return ((void *)(pgva + off)); 117 } 118 119 void 120 bus_tmapout(void *vp) 121 { 122 vaddr_t pgva; 123 int s; 124 125 pgva = m68k_trunc_page(vp); 126 if (pgva != tmp_vpages[1]) 127 return; 128 129 s = splvm(); 130 pmap_kremove(pgva, PAGE_SIZE); 131 pmap_update(pmap_kernel()); 132 --tmp_vpages_inuse; 133 splx(s); 134 } 135 136 /* 137 * Make a permanent mapping for a device. 138 */ 139 void * 140 bus_mapin(int bustype, int pa, int sz) 141 { 142 vaddr_t va; 143 int off; 144 145 if ((bustype < 0) || (bustype >= BUS__NTYPES)) 146 panic("bus_mapin: bustype"); 147 148 off = pa & PGOFSET; 149 pa -= off; 150 sz += off; 151 sz = m68k_round_page(sz); 152 153 /* Borrow PROM mappings if we can. */ 154 if (bustype == BUS_OBIO) { 155 va = (vaddr_t) obio_find_mapping(pa, sz); 156 if (va != 0) 157 goto done; 158 } 159 160 pa &= bus_info[bustype].mask; 161 pa |= bus_info[bustype].base; 162 pa |= PMAP_NC; /* non-cached */ 163 164 /* Get some kernel virtual address space. */ 165 va = uvm_km_alloc(kernel_map, sz, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA); 166 if (va == 0) 167 panic("bus_mapin"); 168 169 /* Map it to the specified bus. */ 170 pmap_map(va, pa, pa + sz, VM_PROT_ALL); 171 172 done: 173 return ((void*)(va + off)); 174 } 175 176 void 177 bus_mapout(void *ptr, int sz) 178 { 179 vaddr_t va; 180 int off; 181 182 va = (vaddr_t)ptr; 183 184 /* If it was a PROM mapping, do NOT free it! */ 185 if ((va >= SUN3X_MONSTART) && (va < SUN3X_MONEND)) 186 return; 187 188 off = va & PGOFSET; 189 va -= off; 190 sz += off; 191 sz = m68k_round_page(sz); 192 193 uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY); 194 } 195