1 /* $NetBSD: footbridge_io.c,v 1.7 2002/09/27 15:35:44 provos 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/footbridge.h> 45 #include <arm/footbridge/dc21285mem.h> 46 #include <uvm/uvm_extern.h> 47 48 /* Proto types for all the bus_space structure functions */ 49 50 bs_protos(footbridge); 51 bs_protos(generic); 52 bs_protos(generic_armv4); 53 bs_protos(bs_notimpl); 54 bs_map_proto(footbridge_mem); 55 bs_unmap_proto(footbridge_mem); 56 57 /* Declare the footbridge bus space tag */ 58 59 struct bus_space footbridge_bs_tag = { 60 /* cookie */ 61 (void *) 0, /* Base address */ 62 63 /* mapping/unmapping */ 64 footbridge_bs_map, 65 footbridge_bs_unmap, 66 footbridge_bs_subregion, 67 68 /* allocation/deallocation */ 69 footbridge_bs_alloc, 70 footbridge_bs_free, 71 72 /* get kernel virtual address */ 73 footbridge_bs_vaddr, 74 75 /* Mmap bus space for user */ 76 bs_notimpl_bs_mmap, 77 78 /* barrier */ 79 footbridge_bs_barrier, 80 81 /* read (single) */ 82 generic_bs_r_1, 83 generic_armv4_bs_r_2, 84 generic_bs_r_4, 85 bs_notimpl_bs_r_8, 86 87 /* read multiple */ 88 generic_bs_rm_1, 89 generic_armv4_bs_rm_2, 90 generic_bs_rm_4, 91 bs_notimpl_bs_rm_8, 92 93 /* read region */ 94 bs_notimpl_bs_rr_1, 95 generic_armv4_bs_rr_2, 96 generic_bs_rr_4, 97 bs_notimpl_bs_rr_8, 98 99 /* write (single) */ 100 generic_bs_w_1, 101 generic_armv4_bs_w_2, 102 generic_bs_w_4, 103 bs_notimpl_bs_w_8, 104 105 /* write multiple */ 106 generic_bs_wm_1, 107 generic_armv4_bs_wm_2, 108 generic_bs_wm_4, 109 bs_notimpl_bs_wm_8, 110 111 /* write region */ 112 bs_notimpl_bs_wr_1, 113 generic_armv4_bs_wr_2, 114 generic_bs_wr_4, 115 bs_notimpl_bs_wr_8, 116 117 /* set multiple */ 118 bs_notimpl_bs_sm_1, 119 bs_notimpl_bs_sm_2, 120 bs_notimpl_bs_sm_4, 121 bs_notimpl_bs_sm_8, 122 123 /* set region */ 124 bs_notimpl_bs_sr_1, 125 generic_armv4_bs_sr_2, 126 bs_notimpl_bs_sr_4, 127 bs_notimpl_bs_sr_8, 128 129 /* copy */ 130 bs_notimpl_bs_c_1, 131 generic_armv4_bs_c_2, 132 bs_notimpl_bs_c_4, 133 bs_notimpl_bs_c_8, 134 }; 135 136 void footbridge_create_io_bs_tag(t, cookie) 137 struct bus_space *t; 138 void *cookie; 139 { 140 *t = footbridge_bs_tag; 141 t->bs_cookie = cookie; 142 } 143 144 void footbridge_create_mem_bs_tag(t, cookie) 145 struct bus_space *t; 146 void *cookie; 147 { 148 *t = footbridge_bs_tag; 149 t->bs_map = footbridge_mem_bs_map; 150 t->bs_unmap = footbridge_mem_bs_unmap; 151 t->bs_cookie = cookie; 152 } 153 154 /* bus space functions */ 155 156 int 157 footbridge_bs_map(t, bpa, size, cacheable, bshp) 158 void *t; 159 bus_addr_t bpa; 160 bus_size_t size; 161 int cacheable; 162 bus_space_handle_t *bshp; 163 { 164 /* 165 * The whole 64K of PCI space is always completely mapped during 166 * boot. 167 * 168 * Eventually this function will do the mapping check overlapping / 169 * multiple mappings. 170 */ 171 172 /* The cookie is the base address for the I/O area */ 173 *bshp = bpa + (bus_addr_t)t; 174 return(0); 175 } 176 177 int 178 footbridge_mem_bs_map(t, bpa, size, cacheable, bshp) 179 void *t; 180 bus_addr_t bpa; 181 bus_size_t size; 182 int cacheable; 183 bus_space_handle_t *bshp; 184 { 185 bus_addr_t startpa, endpa; 186 vaddr_t va; 187 188 /* Round the allocation to page boundries */ 189 startpa = trunc_page(bpa); 190 endpa = round_page(bpa + size); 191 192 /* 193 * Check for mappings below 1MB as we have this space already 194 * mapped. In practice it is only the VGA hole that takes 195 * advantage of this. 196 */ 197 if (endpa < DC21285_PCI_ISA_MEM_VSIZE) { 198 /* Store the bus space handle */ 199 *bshp = DC21285_PCI_ISA_MEM_VBASE + bpa; 200 return 0; 201 } 202 203 /* 204 * Eventually this function will do the mapping check for overlapping / 205 * multiple mappings 206 */ 207 208 va = uvm_km_valloc(kernel_map, endpa - startpa); 209 if (va == 0) 210 return ENOMEM; 211 212 /* Store the bus space handle */ 213 *bshp = va + (bpa & PGOFSET); 214 215 /* Now map the pages */ 216 /* The cookie is the physical base address for the I/O area */ 217 while (startpa < endpa) { 218 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + startpa, 219 VM_PROT_READ | VM_PROT_WRITE, 0); 220 va += NBPG; 221 startpa += NBPG; 222 } 223 pmap_update(pmap_kernel()); 224 225 /* if (bpa >= DC21285_PCI_MEM_VSIZE && bpa != DC21285_ARMCSR_VBASE) 226 panic("footbridge_bs_map: Address out of range (%08lx)", bpa); 227 */ 228 return(0); 229 } 230 231 int 232 footbridge_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 233 bpap, bshp) 234 void *t; 235 bus_addr_t rstart, rend; 236 bus_size_t size, alignment, boundary; 237 int cacheable; 238 bus_addr_t *bpap; 239 bus_space_handle_t *bshp; 240 { 241 panic("footbridge_alloc(): Help!"); 242 } 243 244 245 void 246 footbridge_bs_unmap(t, bsh, size) 247 void *t; 248 bus_space_handle_t bsh; 249 bus_size_t size; 250 { 251 /* 252 * Temporary implementation 253 */ 254 } 255 256 void 257 footbridge_mem_bs_unmap(t, bsh, size) 258 void *t; 259 bus_space_handle_t bsh; 260 bus_size_t size; 261 { 262 vaddr_t startva, endva; 263 264 /* 265 * Check for mappings below 1MB as we have this space permenantly 266 * mapped. In practice it is only the VGA hole that takes 267 * advantage of this. 268 */ 269 if (bsh >= DC21285_PCI_ISA_MEM_VBASE 270 && bsh < (DC21285_PCI_ISA_MEM_VBASE + DC21285_PCI_ISA_MEM_VSIZE)) { 271 return; 272 } 273 274 startva = trunc_page(bsh); 275 endva = round_page(bsh + size); 276 277 uvm_km_free(kernel_map, startva, endva - startva); 278 } 279 280 void 281 footbridge_bs_free(t, bsh, size) 282 void *t; 283 bus_space_handle_t bsh; 284 bus_size_t size; 285 { 286 287 panic("footbridge_free(): Help!"); 288 /* footbridge_bs_unmap() does all that we need to do. */ 289 /* footbridge_bs_unmap(t, bsh, size);*/ 290 } 291 292 int 293 footbridge_bs_subregion(t, bsh, offset, size, nbshp) 294 void *t; 295 bus_space_handle_t bsh; 296 bus_size_t offset, size; 297 bus_space_handle_t *nbshp; 298 { 299 300 *nbshp = bsh + (offset << ((int)t)); 301 return (0); 302 } 303 304 void * 305 footbridge_bs_vaddr(t, bsh) 306 void *t; 307 bus_space_handle_t bsh; 308 { 309 310 return ((void *)bsh); 311 } 312 313 void 314 footbridge_bs_barrier(t, bsh, offset, len, flags) 315 void *t; 316 bus_space_handle_t bsh; 317 bus_size_t offset, len; 318 int flags; 319 { 320 } 321