footbridge_io.c revision 1.2
1/* $NetBSD: footbridge_io.c,v 1.2 2001/07/28 18:12:44 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 49bs_protos(footbridge); 50bs_protos(bs_notimpl); 51bs_map_proto(footbridge_mem); 52bs_unmap_proto(footbridge_mem); 53 54/* Declare the footbridge bus space tag */ 55 56struct 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 /* barrier */ 73 footbridge_bs_barrier, 74 75 /* read (single) */ 76 footbridge_bs_r_1, 77 footbridge_bs_r_2, 78 footbridge_bs_r_4, 79 bs_notimpl_bs_r_8, 80 81 /* read multiple */ 82 footbridge_bs_rm_1, 83 footbridge_bs_rm_2, 84 footbridge_bs_rm_4, 85 bs_notimpl_bs_rm_8, 86 87 /* read region */ 88 bs_notimpl_bs_rr_1, 89 footbridge_bs_rr_2, 90 footbridge_bs_rr_4, 91 bs_notimpl_bs_rr_8, 92 93 /* write (single) */ 94 footbridge_bs_w_1, 95 footbridge_bs_w_2, 96 footbridge_bs_w_4, 97 bs_notimpl_bs_w_8, 98 99 /* write multiple */ 100 footbridge_bs_wm_1, 101 footbridge_bs_wm_2, 102 footbridge_bs_wm_4, 103 bs_notimpl_bs_wm_8, 104 105 /* write region */ 106 bs_notimpl_bs_wr_1, 107 footbridge_bs_wr_2, 108 footbridge_bs_wr_4, 109 bs_notimpl_bs_wr_8, 110 111 /* set multiple */ 112 bs_notimpl_bs_sm_1, 113 bs_notimpl_bs_sm_2, 114 bs_notimpl_bs_sm_4, 115 bs_notimpl_bs_sm_8, 116 117 /* set region */ 118 bs_notimpl_bs_sr_1, 119 footbridge_bs_sr_2, 120 bs_notimpl_bs_sr_4, 121 bs_notimpl_bs_sr_8, 122 123 /* copy */ 124 bs_notimpl_bs_c_1, 125 footbridge_bs_c_2, 126 bs_notimpl_bs_c_4, 127 bs_notimpl_bs_c_8, 128}; 129 130void footbridge_create_io_bs_tag(t, cookie) 131 struct bus_space *t; 132 void *cookie; 133{ 134 *t = footbridge_bs_tag; 135 t->bs_cookie = cookie; 136} 137 138void footbridge_create_mem_bs_tag(t, cookie) 139 struct bus_space *t; 140 void *cookie; 141{ 142 *t = footbridge_bs_tag; 143 t->bs_map = footbridge_mem_bs_map; 144 t->bs_unmap = footbridge_mem_bs_unmap; 145 t->bs_cookie = cookie; 146} 147 148/* bus space functions */ 149 150int 151footbridge_bs_map(t, bpa, size, cacheable, bshp) 152 void *t; 153 bus_addr_t bpa; 154 bus_size_t size; 155 int cacheable; 156 bus_space_handle_t *bshp; 157{ 158 /* 159 * The whole 64K of PCI space is always completely mapped during 160 * boot. 161 * 162 * Eventually this function will do the mapping check overlapping / 163 * multiple mappings. 164 */ 165 166 /* The cookie is the base address for the I/O area */ 167 *bshp = bpa + (bus_addr_t)t; 168 return(0); 169} 170 171int 172footbridge_mem_bs_map(t, bpa, size, cacheable, bshp) 173 void *t; 174 bus_addr_t bpa; 175 bus_size_t size; 176 int cacheable; 177 bus_space_handle_t *bshp; 178{ 179 bus_addr_t startpa, endpa; 180 vaddr_t va; 181 182 /* Round the allocation to page boundries */ 183 startpa = trunc_page(bpa); 184 endpa = round_page(bpa + size); 185 186 /* 187 * Check for mappings below 1MB as we have this space already 188 * mapped. In practice it is only the VGA hole that takes 189 * advantage of this. 190 */ 191 if (endpa < DC21285_PCI_ISA_MEM_VSIZE) { 192 /* Store the bus space handle */ 193 *bshp = DC21285_PCI_ISA_MEM_VBASE + bpa; 194 return 0; 195 } 196 197 /* 198 * Eventually this function will do the mapping check for overlapping / 199 * multiple mappings 200 */ 201 202 va = uvm_km_valloc(kernel_map, endpa - startpa); 203 if (va == 0) 204 return ENOMEM; 205 206 /* Store the bus space handle */ 207 *bshp = va + (bpa & PGOFSET); 208 209 /* Now map the pages */ 210 /* The cookie is the physical base address for the I/O area */ 211 while (startpa < endpa) { 212 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + startpa, 213 VM_PROT_READ | VM_PROT_WRITE, 0); 214 va += NBPG; 215 startpa += NBPG; 216 } 217 pmap_update(); 218 219/* if (bpa >= DC21285_PCI_MEM_VSIZE && bpa != DC21285_ARMCSR_VBASE) 220 panic("footbridge_bs_map: Address out of range (%08lx)\n", bpa); 221*/ 222 return(0); 223} 224 225int 226footbridge_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 227 bpap, bshp) 228 void *t; 229 bus_addr_t rstart, rend; 230 bus_size_t size, alignment, boundary; 231 int cacheable; 232 bus_addr_t *bpap; 233 bus_space_handle_t *bshp; 234{ 235 panic("footbridge_alloc(): Help!\n"); 236} 237 238 239void 240footbridge_bs_unmap(t, bsh, size) 241 void *t; 242 bus_space_handle_t bsh; 243 bus_size_t size; 244{ 245 /* 246 * Temporary implementation 247 */ 248} 249 250void 251footbridge_mem_bs_unmap(t, bsh, size) 252 void *t; 253 bus_space_handle_t bsh; 254 bus_size_t size; 255{ 256 vaddr_t startva, endva; 257 258 /* 259 * Check for mappings below 1MB as we have this space permenantly 260 * mapped. In practice it is only the VGA hole that takes 261 * advantage of this. 262 */ 263 if (bsh >= DC21285_PCI_ISA_MEM_VBASE 264 && bsh < (DC21285_PCI_ISA_MEM_VBASE + DC21285_PCI_ISA_MEM_VSIZE)) { 265 return; 266 } 267 268 startva = trunc_page(bsh); 269 endva = round_page(bsh + size); 270 271 uvm_km_free(kernel_map, startva, endva - startva); 272} 273 274void 275footbridge_bs_free(t, bsh, size) 276 void *t; 277 bus_space_handle_t bsh; 278 bus_size_t size; 279{ 280 281 panic("footbridge_free(): Help!\n"); 282 /* footbridge_bs_unmap() does all that we need to do. */ 283/* footbridge_bs_unmap(t, bsh, size);*/ 284} 285 286int 287footbridge_bs_subregion(t, bsh, offset, size, nbshp) 288 void *t; 289 bus_space_handle_t bsh; 290 bus_size_t offset, size; 291 bus_space_handle_t *nbshp; 292{ 293 294 *nbshp = bsh + (offset << ((int)t)); 295 return (0); 296} 297 298void * 299footbridge_bs_vaddr(t, bsh) 300 void *t; 301 bus_space_handle_t bsh; 302{ 303 304 return ((void *)bsh); 305} 306 307void 308footbridge_bs_barrier(t, bsh, offset, len, flags) 309 void *t; 310 bus_space_handle_t bsh; 311 bus_size_t offset, len; 312 int flags; 313{ 314} 315