footbridge_io.c revision 1.14.20.2
1 /* $NetBSD: footbridge_io.c,v 1.14.20.2 2010/03/11 15:02:05 yamt 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 1.14.20.2 2010/03/11 15:02:05 yamt 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_mem); 60 61 /* Declare the footbridge bus space tag */ 62 63 struct bus_space footbridge_bs_tag = { 64 /* cookie */ 65 (void *) 0, /* Base address */ 66 67 /* mapping/unmapping */ 68 footbridge_bs_map, 69 footbridge_bs_unmap, 70 footbridge_bs_subregion, 71 72 /* allocation/deallocation */ 73 footbridge_bs_alloc, 74 footbridge_bs_free, 75 76 /* get kernel virtual address */ 77 footbridge_bs_vaddr, 78 79 /* Mmap bus space for user */ 80 bs_notimpl_bs_mmap, 81 82 /* barrier */ 83 footbridge_bs_barrier, 84 85 /* read (single) */ 86 generic_bs_r_1, 87 generic_armv4_bs_r_2, 88 generic_bs_r_4, 89 bs_notimpl_bs_r_8, 90 91 /* read multiple */ 92 generic_bs_rm_1, 93 generic_armv4_bs_rm_2, 94 generic_bs_rm_4, 95 bs_notimpl_bs_rm_8, 96 97 /* read region */ 98 bs_notimpl_bs_rr_1, 99 generic_armv4_bs_rr_2, 100 generic_bs_rr_4, 101 bs_notimpl_bs_rr_8, 102 103 /* write (single) */ 104 generic_bs_w_1, 105 generic_armv4_bs_w_2, 106 generic_bs_w_4, 107 bs_notimpl_bs_w_8, 108 109 /* write multiple */ 110 generic_bs_wm_1, 111 generic_armv4_bs_wm_2, 112 generic_bs_wm_4, 113 bs_notimpl_bs_wm_8, 114 115 /* write region */ 116 bs_notimpl_bs_wr_1, 117 generic_armv4_bs_wr_2, 118 generic_bs_wr_4, 119 bs_notimpl_bs_wr_8, 120 121 /* set multiple */ 122 bs_notimpl_bs_sm_1, 123 bs_notimpl_bs_sm_2, 124 bs_notimpl_bs_sm_4, 125 bs_notimpl_bs_sm_8, 126 127 /* set region */ 128 bs_notimpl_bs_sr_1, 129 generic_armv4_bs_sr_2, 130 bs_notimpl_bs_sr_4, 131 bs_notimpl_bs_sr_8, 132 133 /* copy */ 134 bs_notimpl_bs_c_1, 135 generic_armv4_bs_c_2, 136 bs_notimpl_bs_c_4, 137 bs_notimpl_bs_c_8, 138 }; 139 140 void footbridge_create_io_bs_tag(t, cookie) 141 struct bus_space *t; 142 void *cookie; 143 { 144 *t = footbridge_bs_tag; 145 t->bs_cookie = cookie; 146 } 147 148 void footbridge_create_mem_bs_tag(t, cookie) 149 struct bus_space *t; 150 void *cookie; 151 { 152 *t = footbridge_bs_tag; 153 t->bs_map = footbridge_mem_bs_map; 154 t->bs_unmap = footbridge_mem_bs_unmap; 155 t->bs_mmap = footbridge_mem_bs_mmap; 156 t->bs_cookie = cookie; 157 } 158 159 /* bus space functions */ 160 161 int 162 footbridge_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable, 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(void *t, bus_addr_t bpa, bus_size_t size, int flags, bus_space_handle_t *bshp) 179 { 180 bus_addr_t startpa, endpa, pa; 181 vaddr_t va; 182 183 /* Round the allocation to page boundries */ 184 startpa = trunc_page(bpa); 185 endpa = round_page(bpa + size); 186 187 /* 188 * Check for mappings below 1MB as we have this space already 189 * mapped. In practice it is only the VGA hole that takes 190 * advantage of this. 191 */ 192 if (endpa < DC21285_PCI_ISA_MEM_VSIZE) { 193 /* Store the bus space handle */ 194 *bshp = DC21285_PCI_ISA_MEM_VBASE + bpa; 195 return 0; 196 } 197 198 /* 199 * Eventually this function will do the mapping check for overlapping / 200 * multiple mappings 201 */ 202 203 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 204 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 205 if (va == 0) 206 return ENOMEM; 207 208 /* Store the bus space handle */ 209 *bshp = va + (bpa & PGOFSET); 210 211 /* Now map the pages */ 212 /* The cookie is the physical base address for the I/O area */ 213 for (pa = startpa; pa < endpa; pa+=PAGE_SIZE, va += PAGE_SIZE) 214 { 215 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + pa, VM_PROT_READ | VM_PROT_WRITE, 216 VM_PROT_READ | VM_PROT_WRITE| PMAP_WIRED); 217 if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) { 218 pt_entry_t *pte; 219 pte = vtopte(va); 220 *pte &= ~L2_S_CACHE_MASK; 221 PTE_SYNC(pte); 222 } 223 } 224 pmap_update(pmap_kernel()); 225 226 /* if (bpa >= DC21285_PCI_MEM_VSIZE && bpa != DC21285_ARMCSR_VBASE) 227 panic("footbridge_bs_map: Address out of range (%08lx)", bpa); 228 */ 229 return(0); 230 } 231 232 int 233 footbridge_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 234 bpap, bshp) 235 void *t; 236 bus_addr_t rstart, rend; 237 bus_size_t size, alignment, boundary; 238 int cacheable; 239 bus_addr_t *bpap; 240 bus_space_handle_t *bshp; 241 { 242 panic("footbridge_alloc(): Help!"); 243 } 244 245 246 void 247 footbridge_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 248 { 249 /* 250 * Temporary implementation 251 */ 252 } 253 254 void 255 footbridge_mem_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 256 { 257 vaddr_t startva, endva; 258 259 /* 260 * Check for mappings below 1MB as we have this space permenantly 261 * mapped. In practice it is only the VGA hole that takes 262 * advantage of this. 263 */ 264 if (bsh >= DC21285_PCI_ISA_MEM_VBASE 265 && bsh < (DC21285_PCI_ISA_MEM_VBASE + DC21285_PCI_ISA_MEM_VSIZE)) { 266 return; 267 } 268 269 startva = trunc_page(bsh); 270 endva = round_page(bsh + size); 271 272 pmap_remove(pmap_kernel(), startva, endva); 273 pmap_update(pmap_kernel()); 274 uvm_km_free(kernel_map, startva, endva - startva, UVM_KMF_VAONLY); 275 } 276 277 void 278 footbridge_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 279 { 280 281 panic("footbridge_free(): Help!"); 282 /* footbridge_bs_unmap() does all that we need to do. */ 283 /* footbridge_bs_unmap(t, bsh, size);*/ 284 } 285 286 int 287 footbridge_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 288 { 289 290 *nbshp = bsh + (offset << ((int)t)); 291 return (0); 292 } 293 294 void * 295 footbridge_bs_vaddr(void *t, bus_space_handle_t bsh) 296 { 297 298 return ((void *)bsh); 299 } 300 301 void 302 footbridge_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags) 303 { 304 } 305 306 307 paddr_t 308 footbridge_mem_bs_mmap(void *t, bus_addr_t addr, off_t offset, 309 int prot, int flags) 310 { 311 paddr_t pa; 312 313 if (addr >= DC21285_PCI_MEM_SIZE 314 || offset < 0 315 || offset >= DC21285_PCI_MEM_SIZE 316 || addr >= DC21285_PCI_MEM_SIZE - offset) 317 return -1; 318 319 pa = DC21285_PCI_MEM_BASE + addr + offset; 320 321 return arm_btop(pa); 322 } 323
Indexes created Sat Oct 25 16:10:12 GMT 2025