footbridge_io.c revision 1.16.4.1
1 /* $NetBSD: footbridge_io.c,v 1.16.4.1 2011/03/05 20:49:32 rmind 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/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: footbridge_io.c,v 1.16.4.1 2011/03/05 20:49:32 rmind Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <machine/bus.h> 47 #include <arm/footbridge/footbridge.h> 48 #include <arm/footbridge/dc21285mem.h> 49 #include <uvm/uvm_extern.h> 50 51 /* Proto types for all the bus_space structure functions */ 52 53 bs_protos(footbridge); 54 bs_protos(generic); 55 bs_protos(generic_armv4); 56 bs_protos(bs_notimpl); 57 bs_map_proto(footbridge_mem); 58 bs_unmap_proto(footbridge_mem); 59 bs_mmap_proto(footbridge_io); 60 bs_mmap_proto(footbridge_mem); 61 62 /* Declare the footbridge bus space tag */ 63 64 struct bus_space footbridge_bs_tag = { 65 /* cookie */ 66 (void *) 0, /* Base address */ 67 68 /* mapping/unmapping */ 69 footbridge_bs_map, 70 footbridge_bs_unmap, 71 footbridge_bs_subregion, 72 73 /* allocation/deallocation */ 74 footbridge_bs_alloc, 75 footbridge_bs_free, 76 77 /* get kernel virtual address */ 78 footbridge_bs_vaddr, 79 80 /* Mmap bus space for user */ 81 bs_notimpl_bs_mmap, 82 83 /* barrier */ 84 footbridge_bs_barrier, 85 86 /* read (single) */ 87 generic_bs_r_1, 88 generic_armv4_bs_r_2, 89 generic_bs_r_4, 90 bs_notimpl_bs_r_8, 91 92 /* read multiple */ 93 generic_bs_rm_1, 94 generic_armv4_bs_rm_2, 95 generic_bs_rm_4, 96 bs_notimpl_bs_rm_8, 97 98 /* read region */ 99 bs_notimpl_bs_rr_1, 100 generic_armv4_bs_rr_2, 101 generic_bs_rr_4, 102 bs_notimpl_bs_rr_8, 103 104 /* write (single) */ 105 generic_bs_w_1, 106 generic_armv4_bs_w_2, 107 generic_bs_w_4, 108 bs_notimpl_bs_w_8, 109 110 /* write multiple */ 111 generic_bs_wm_1, 112 generic_armv4_bs_wm_2, 113 generic_bs_wm_4, 114 bs_notimpl_bs_wm_8, 115 116 /* write region */ 117 bs_notimpl_bs_wr_1, 118 generic_armv4_bs_wr_2, 119 generic_bs_wr_4, 120 bs_notimpl_bs_wr_8, 121 122 /* set multiple */ 123 bs_notimpl_bs_sm_1, 124 bs_notimpl_bs_sm_2, 125 bs_notimpl_bs_sm_4, 126 bs_notimpl_bs_sm_8, 127 128 /* set region */ 129 bs_notimpl_bs_sr_1, 130 generic_armv4_bs_sr_2, 131 bs_notimpl_bs_sr_4, 132 bs_notimpl_bs_sr_8, 133 134 /* copy */ 135 bs_notimpl_bs_c_1, 136 generic_armv4_bs_c_2, 137 bs_notimpl_bs_c_4, 138 bs_notimpl_bs_c_8, 139 }; 140 141 void footbridge_create_io_bs_tag(t, cookie) 142 struct bus_space *t; 143 void *cookie; 144 { 145 *t = footbridge_bs_tag; 146 t->bs_cookie = cookie; 147 t->bs_mmap = footbridge_io_bs_mmap; 148 } 149 150 void footbridge_create_mem_bs_tag(t, cookie) 151 struct bus_space *t; 152 void *cookie; 153 { 154 *t = footbridge_bs_tag; 155 t->bs_map = footbridge_mem_bs_map; 156 t->bs_unmap = footbridge_mem_bs_unmap; 157 t->bs_mmap = footbridge_mem_bs_mmap; 158 t->bs_cookie = cookie; 159 } 160 161 /* bus space functions */ 162 163 int 164 footbridge_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable, bus_space_handle_t *bshp) 165 { 166 /* 167 * The whole 64K of PCI space is always completely mapped during 168 * boot. 169 * 170 * Eventually this function will do the mapping check overlapping / 171 * multiple mappings. 172 */ 173 174 /* The cookie is the base address for the I/O area */ 175 *bshp = bpa + (bus_addr_t)t; 176 return(0); 177 } 178 179 int 180 footbridge_mem_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags, bus_space_handle_t *bshp) 181 { 182 bus_addr_t startpa, endpa, pa; 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_alloc(kernel_map, endpa - startpa, 0, 206 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 207 if (va == 0) 208 return ENOMEM; 209 210 /* Store the bus space handle */ 211 *bshp = va + (bpa & PGOFSET); 212 213 /* Now map the pages */ 214 /* The cookie is the physical base address for the I/O area */ 215 for (pa = startpa; pa < endpa; pa+=PAGE_SIZE, va += PAGE_SIZE) { 216 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + pa, VM_PROT_READ | VM_PROT_WRITE, 217 VM_PROT_READ | VM_PROT_WRITE| PMAP_WIRED); 218 if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) { 219 pt_entry_t *pte; 220 pte = vtopte(va); 221 *pte &= ~L2_S_CACHE_MASK; 222 PTE_SYNC(pte); 223 } 224 } 225 pmap_update(pmap_kernel()); 226 227 /* if (bpa >= DC21285_PCI_MEM_VSIZE && bpa != DC21285_ARMCSR_VBASE) 228 panic("footbridge_bs_map: Address out of range (%08lx)", bpa); 229 */ 230 return(0); 231 } 232 233 int 234 footbridge_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 235 bpap, bshp) 236 void *t; 237 bus_addr_t rstart, rend; 238 bus_size_t size, alignment, boundary; 239 int cacheable; 240 bus_addr_t *bpap; 241 bus_space_handle_t *bshp; 242 { 243 panic("footbridge_alloc(): Help!"); 244 } 245 246 247 void 248 footbridge_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 249 { 250 /* 251 * Temporary implementation 252 */ 253 } 254 255 void 256 footbridge_mem_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 257 { 258 vaddr_t startva, endva; 259 260 /* 261 * Check for mappings below 1MB as we have this space permenantly 262 * mapped. In practice it is only the VGA hole that takes 263 * advantage of this. 264 */ 265 if (bsh >= DC21285_PCI_ISA_MEM_VBASE 266 && bsh < (DC21285_PCI_ISA_MEM_VBASE + DC21285_PCI_ISA_MEM_VSIZE)) { 267 return; 268 } 269 270 startva = trunc_page(bsh); 271 endva = round_page(bsh + size); 272 273 pmap_remove(pmap_kernel(), startva, endva); 274 pmap_update(pmap_kernel()); 275 uvm_km_free(kernel_map, startva, endva - startva, UVM_KMF_VAONLY); 276 } 277 278 void 279 footbridge_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 280 { 281 282 panic("footbridge_free(): Help!"); 283 /* footbridge_bs_unmap() does all that we need to do. */ 284 /* footbridge_bs_unmap(t, bsh, size);*/ 285 } 286 287 int 288 footbridge_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 289 { 290 291 *nbshp = bsh + (offset << ((int)t)); 292 return (0); 293 } 294 295 void * 296 footbridge_bs_vaddr(void *t, bus_space_handle_t bsh) 297 { 298 299 return ((void *)bsh); 300 } 301 302 void 303 footbridge_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags) 304 { 305 } 306 307 308 paddr_t 309 footbridge_io_bs_mmap(void *t, bus_addr_t addr, off_t offset, 310 int prot, int flags) 311 { 312 paddr_t pa; 313 314 /* allow mapping of IO space */ 315 if (addr >= DC21285_PCI_IO_SIZE || 316 addr >= DC21285_PCI_IO_SIZE - offset || 317 offset < 0 || 318 offset >= DC21285_PCI_IO_SIZE) 319 return -1; 320 321 pa = DC21285_PCI_IO_BASE + addr + offset; 322 323 return arm_btop(pa); 324 } 325 326 327 paddr_t 328 footbridge_mem_bs_mmap(void *t, bus_addr_t addr, off_t offset, 329 int prot, int flags) 330 { 331 paddr_t pa; 332 333 if (addr >= DC21285_PCI_MEM_SIZE 334 || offset < 0 335 || offset >= DC21285_PCI_MEM_SIZE 336 || addr >= DC21285_PCI_MEM_SIZE - offset) 337 return -1; 338 339 pa = DC21285_PCI_MEM_BASE + addr + offset; 340 341 return arm_btop(pa); 342 } 343
Indexes created Sat Oct 25 16:10:12 GMT 2025