footbridge_io.c revision 1.4
1 /* $NetBSD: footbridge_io.c,v 1.4 2001/09/10 23:05:19 chris Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Causality Limited 5 * Copyright (c) 1997 Mark Brinicombe. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Mark Brinicombe 19 * for the NetBSD Project. 20 * 4. The name of the company nor the name of the author may be used to 21 * endorse or promote products derived from this software without specific 22 * prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* 38 * bus_space I/O functions for footbridge 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <machine/bus.h> 44 #include <arm/footbridge/dc21285mem.h> 45 #include <uvm/uvm_extern.h> 46 47 /* Proto types for all the bus_space structure functions */ 48 49 bs_protos(footbridge); 50 bs_protos(bs_notimpl); 51 bs_map_proto(footbridge_mem); 52 bs_unmap_proto(footbridge_mem); 53 54 /* Declare the footbridge bus space tag */ 55 56 struct bus_space footbridge_bs_tag = { 57 /* cookie */ 58 (void *) 0, /* Base address */ 59 60 /* mapping/unmapping */ 61 footbridge_bs_map, 62 footbridge_bs_unmap, 63 footbridge_bs_subregion, 64 65 /* allocation/deallocation */ 66 footbridge_bs_alloc, 67 footbridge_bs_free, 68 69 /* get kernel virtual address */ 70 footbridge_bs_vaddr, 71 72 /* Mmap bus space for user */ 73 bs_notimpl_bs_mmap, 74 75 /* barrier */ 76 footbridge_bs_barrier, 77 78 /* read (single) */ 79 footbridge_bs_r_1, 80 footbridge_bs_r_2, 81 footbridge_bs_r_4, 82 bs_notimpl_bs_r_8, 83 84 /* read multiple */ 85 footbridge_bs_rm_1, 86 footbridge_bs_rm_2, 87 footbridge_bs_rm_4, 88 bs_notimpl_bs_rm_8, 89 90 /* read region */ 91 bs_notimpl_bs_rr_1, 92 footbridge_bs_rr_2, 93 footbridge_bs_rr_4, 94 bs_notimpl_bs_rr_8, 95 96 /* write (single) */ 97 footbridge_bs_w_1, 98 footbridge_bs_w_2, 99 footbridge_bs_w_4, 100 bs_notimpl_bs_w_8, 101 102 /* write multiple */ 103 footbridge_bs_wm_1, 104 footbridge_bs_wm_2, 105 footbridge_bs_wm_4, 106 bs_notimpl_bs_wm_8, 107 108 /* write region */ 109 bs_notimpl_bs_wr_1, 110 footbridge_bs_wr_2, 111 footbridge_bs_wr_4, 112 bs_notimpl_bs_wr_8, 113 114 /* set multiple */ 115 bs_notimpl_bs_sm_1, 116 bs_notimpl_bs_sm_2, 117 bs_notimpl_bs_sm_4, 118 bs_notimpl_bs_sm_8, 119 120 /* set region */ 121 bs_notimpl_bs_sr_1, 122 footbridge_bs_sr_2, 123 bs_notimpl_bs_sr_4, 124 bs_notimpl_bs_sr_8, 125 126 /* copy */ 127 bs_notimpl_bs_c_1, 128 footbridge_bs_c_2, 129 bs_notimpl_bs_c_4, 130 bs_notimpl_bs_c_8, 131 }; 132 133 void footbridge_create_io_bs_tag(t, cookie) 134 struct bus_space *t; 135 void *cookie; 136 { 137 *t = footbridge_bs_tag; 138 t->bs_cookie = cookie; 139 } 140 141 void footbridge_create_mem_bs_tag(t, cookie) 142 struct bus_space *t; 143 void *cookie; 144 { 145 *t = footbridge_bs_tag; 146 t->bs_map = footbridge_mem_bs_map; 147 t->bs_unmap = footbridge_mem_bs_unmap; 148 t->bs_cookie = cookie; 149 } 150 151 /* bus space functions */ 152 153 int 154 footbridge_bs_map(t, bpa, size, cacheable, bshp) 155 void *t; 156 bus_addr_t bpa; 157 bus_size_t size; 158 int cacheable; 159 bus_space_handle_t *bshp; 160 { 161 /* 162 * The whole 64K of PCI space is always completely mapped during 163 * boot. 164 * 165 * Eventually this function will do the mapping check overlapping / 166 * multiple mappings. 167 */ 168 169 /* The cookie is the base address for the I/O area */ 170 *bshp = bpa + (bus_addr_t)t; 171 return(0); 172 } 173 174 int 175 footbridge_mem_bs_map(t, bpa, size, cacheable, bshp) 176 void *t; 177 bus_addr_t bpa; 178 bus_size_t size; 179 int cacheable; 180 bus_space_handle_t *bshp; 181 { 182 bus_addr_t startpa, endpa; 183 vaddr_t va; 184 185 /* Round the allocation to page boundries */ 186 startpa = trunc_page(bpa); 187 endpa = round_page(bpa + size); 188 189 /* 190 * Check for mappings below 1MB as we have this space already 191 * mapped. In practice it is only the VGA hole that takes 192 * advantage of this. 193 */ 194 if (endpa < DC21285_PCI_ISA_MEM_VSIZE) { 195 /* Store the bus space handle */ 196 *bshp = DC21285_PCI_ISA_MEM_VBASE + bpa; 197 return 0; 198 } 199 200 /* 201 * Eventually this function will do the mapping check for overlapping / 202 * multiple mappings 203 */ 204 205 va = uvm_km_valloc(kernel_map, endpa - startpa); 206 if (va == 0) 207 return ENOMEM; 208 209 /* Store the bus space handle */ 210 *bshp = va + (bpa & PGOFSET); 211 212 /* Now map the pages */ 213 /* The cookie is the physical base address for the I/O area */ 214 while (startpa < endpa) { 215 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + startpa, 216 VM_PROT_READ | VM_PROT_WRITE, 0); 217 va += NBPG; 218 startpa += NBPG; 219 } 220 pmap_update(pmap_kernel()); 221 222 /* if (bpa >= DC21285_PCI_MEM_VSIZE && bpa != DC21285_ARMCSR_VBASE) 223 panic("footbridge_bs_map: Address out of range (%08lx)\n", bpa); 224 */ 225 return(0); 226 } 227 228 int 229 footbridge_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 230 bpap, bshp) 231 void *t; 232 bus_addr_t rstart, rend; 233 bus_size_t size, alignment, boundary; 234 int cacheable; 235 bus_addr_t *bpap; 236 bus_space_handle_t *bshp; 237 { 238 panic("footbridge_alloc(): Help!\n"); 239 } 240 241 242 void 243 footbridge_bs_unmap(t, bsh, size) 244 void *t; 245 bus_space_handle_t bsh; 246 bus_size_t size; 247 { 248 /* 249 * Temporary implementation 250 */ 251 } 252 253 void 254 footbridge_mem_bs_unmap(t, bsh, size) 255 void *t; 256 bus_space_handle_t bsh; 257 bus_size_t size; 258 { 259 vaddr_t startva, endva; 260 261 /* 262 * Check for mappings below 1MB as we have this space permenantly 263 * mapped. In practice it is only the VGA hole that takes 264 * advantage of this. 265 */ 266 if (bsh >= DC21285_PCI_ISA_MEM_VBASE 267 && bsh < (DC21285_PCI_ISA_MEM_VBASE + DC21285_PCI_ISA_MEM_VSIZE)) { 268 return; 269 } 270 271 startva = trunc_page(bsh); 272 endva = round_page(bsh + size); 273 274 uvm_km_free(kernel_map, startva, endva - startva); 275 } 276 277 void 278 footbridge_bs_free(t, bsh, size) 279 void *t; 280 bus_space_handle_t bsh; 281 bus_size_t size; 282 { 283 284 panic("footbridge_free(): Help!\n"); 285 /* footbridge_bs_unmap() does all that we need to do. */ 286 /* footbridge_bs_unmap(t, bsh, size);*/ 287 } 288 289 int 290 footbridge_bs_subregion(t, bsh, offset, size, nbshp) 291 void *t; 292 bus_space_handle_t bsh; 293 bus_size_t offset, size; 294 bus_space_handle_t *nbshp; 295 { 296 297 *nbshp = bsh + (offset << ((int)t)); 298 return (0); 299 } 300 301 void * 302 footbridge_bs_vaddr(t, bsh) 303 void *t; 304 bus_space_handle_t bsh; 305 { 306 307 return ((void *)bsh); 308 } 309 310 void 311 footbridge_bs_barrier(t, bsh, offset, len, flags) 312 void *t; 313 bus_space_handle_t bsh; 314 bus_size_t offset, len; 315 int flags; 316 { 317 } 318
Indexes created Sat Oct 25 16:10:12 GMT 2025