1 /* $NetBSD: bus_space.c,v 1.17 2008/04/28 20:23:19 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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 * Implementation of bus_space mapping for the hp300. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.17 2008/04/28 20:23:19 martin Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/extent.h> 42 43 #include <machine/autoconf.h> 44 #include <machine/bus.h> 45 46 #include <uvm/uvm_extern.h> 47 48 extern int *nofault; 49 50 /* ARGSUSED */ 51 int 52 bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags, 53 bus_space_handle_t *bshp) 54 { 55 vaddr_t kva; 56 vsize_t offset; 57 int error; 58 59 if (t->bustype == HP300_BUS_SPACE_INTIO) { 60 /* 61 * Intio space is direct-mapped in pmap_bootstrap(); just 62 * do the translation. 63 */ 64 *bshp = (bus_space_handle_t)IIOV(INTIOBASE + bpa); 65 return 0; 66 } 67 68 if (t->bustype != HP300_BUS_SPACE_DIO) 69 panic("bus_space_map: bad space tag"); 70 71 /* 72 * Allocate virtual address space from the extio extent map. 73 */ 74 offset = m68k_page_offset(bpa); 75 size = m68k_round_page(offset + size); 76 error = extent_alloc(extio_ex, size, PAGE_SIZE, 0, 77 EX_FAST | EX_NOWAIT | (extio_ex_malloc_safe ? EX_MALLOCOK : 0), 78 &kva); 79 if (error) 80 return error; 81 82 /* 83 * Map the range. The range is always cache-inhibited on the hp300. 84 */ 85 physaccess((void *)kva, (void *)bpa, size, PG_RW|PG_CI); 86 87 /* 88 * All done. 89 */ 90 *bshp = (bus_space_handle_t)(kva + offset); 91 return 0; 92 } 93 94 /* ARGSUSED */ 95 int 96 bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend, 97 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags, 98 bus_addr_t *bpap, bus_space_handle_t *bshp) 99 { 100 101 /* 102 * Not meaningful on any currently-supported hp300 bus. 103 */ 104 return EINVAL; 105 } 106 107 /* ARGSUSED */ 108 void 109 bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size) 110 { 111 112 /* 113 * Not meaningful on any currently-supported hp300 bus. 114 */ 115 panic("bus_space_free: shouldn't be here"); 116 } 117 118 void 119 bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size) 120 { 121 vaddr_t kva; 122 vsize_t offset; 123 124 if (t->bustype == HP300_BUS_SPACE_INTIO) { 125 /* 126 * Intio space is direct-mapped in pmap_bootstrap(); nothing 127 * to do 128 */ 129 return; 130 } 131 132 if (t->bustype != HP300_BUS_SPACE_DIO) 133 panic("bus_space_map: bad space tag"); 134 135 kva = m68k_trunc_page(bsh); 136 offset = m68k_page_offset(bsh); 137 size = m68k_round_page(offset + size); 138 139 #ifdef DIAGNOSTIC 140 if (bsh < (vaddr_t)extiobase || 141 bsh >= ((vaddr_t)extiobase + ptoa(EIOMAPSIZE))) 142 panic("bus_space_unmap: bad bus space handle"); 143 #endif 144 145 /* 146 * Unmap the range. 147 */ 148 physunaccess((void *)kva, size); 149 150 /* 151 * Free it from the extio extent map. 152 */ 153 if (extent_free(extio_ex, kva, size, 154 EX_NOWAIT | (extio_ex_malloc_safe ? EX_MALLOCOK : 0))) 155 printf("bus_space_unmap: kva 0x%lx size 0x%lx: " 156 "can't free region\n", (u_long) bsh, size); 157 } 158 159 /* ARGSUSED */ 160 int 161 bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 162 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 163 { 164 165 *nbshp = bsh + offset; 166 return 0; 167 } 168 169 /* ARGSUSED */ 170 int 171 hp300_bus_space_probe(bus_space_tag_t t, bus_space_handle_t bsh, 172 bus_size_t offset, int sz) 173 { 174 label_t faultbuf; 175 int i; 176 177 nofault = (int *)&faultbuf; 178 if (setjmp((label_t *)nofault)) { 179 nofault = NULL; 180 return 0; 181 } 182 183 switch (sz) { 184 case 1: 185 i = bus_space_read_1(t, bsh, offset); 186 break; 187 188 case 2: 189 i = bus_space_read_2(t, bsh, offset); 190 break; 191 192 case 4: 193 i = bus_space_read_4(t, bsh, offset); 194 break; 195 196 default: 197 panic("bus_space_probe: unupported data size %d", sz); 198 /* NOTREACHED */ 199 } 200 201 nofault = NULL; 202 return 1; 203 } 204