| 1 | /* $NetBSD: rbus.c,v 1.29 2012/01/27 18:53:07 para Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1999 and 2000 |
| 5 | * HAYAKAWA Koichi. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <sys/cdefs.h> |
| 29 | __KERNEL_RCSID(0, "$NetBSD: rbus.c,v 1.29 2012/01/27 18:53:07 para Exp $" ); |
| 30 | |
| 31 | #include <sys/param.h> |
| 32 | #include <sys/systm.h> |
| 33 | #include <sys/device.h> |
| 34 | #include <sys/malloc.h> |
| 35 | #include <sys/extent.h> |
| 36 | |
| 37 | #include <sys/bus.h> |
| 38 | |
| 39 | #include <dev/cardbus/rbus.h> |
| 40 | |
| 41 | /* #define RBUS_DEBUG */ |
| 42 | |
| 43 | #if defined RBUS_DEBUG |
| 44 | #define STATIC |
| 45 | #define DPRINTF(a) printf a |
| 46 | #else |
| 47 | #define STATIC static |
| 48 | #define DPRINTF(a) |
| 49 | #endif |
| 50 | |
| 51 | |
| 52 | |
| 53 | static rbus_tag_t rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent, |
| 54 | struct extent *ex, bus_addr_t start, |
| 55 | bus_addr_t end, bus_addr_t offset, |
| 56 | int flags); |
| 57 | |
| 58 | |
| 59 | int |
| 60 | rbus_space_alloc(rbus_tag_t rbt, bus_addr_t addr, bus_size_t size, bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp, bus_space_handle_t *bshp) |
| 61 | { |
| 62 | return rbus_space_alloc_subregion(rbt, rbt->rb_start, rbt->rb_end, |
| 63 | addr, size, mask, align, flags, addrp, bshp); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | int |
| 70 | rbus_space_alloc_subregion(rbus_tag_t rbt, bus_addr_t substart, bus_addr_t subend, bus_addr_t addr, bus_size_t size, bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp, bus_space_handle_t *bshp) |
| 71 | { |
| 72 | bus_addr_t decodesize = mask + 1; |
| 73 | bus_addr_t boundary, search_addr; |
| 74 | int val; |
| 75 | u_long result; |
| 76 | int exflags = EX_FAST | EX_NOWAIT | EX_MALLOCOK; |
| 77 | |
| 78 | DPRINTF(("rbus_space_alloc: addr %lx, size %lx, mask %lx, align %lx\n" , |
| 79 | (u_long)addr, (u_long)size, (u_long)mask, (u_long)align)); |
| 80 | |
| 81 | addr += rbt->rb_offset; |
| 82 | |
| 83 | if (mask == 0) { |
| 84 | /* FULL Decode */ |
| 85 | decodesize = 0; |
| 86 | } |
| 87 | |
| 88 | if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) { |
| 89 | return rbus_space_alloc(rbt->rb_parent, addr, size, mask, |
| 90 | align, flags, addrp, bshp); |
| 91 | } else if (rbt->rb_flags == RBUS_SPACE_SHARE || |
| 92 | rbt->rb_flags == RBUS_SPACE_DEDICATE) { |
| 93 | /* rbt has its own sh_extent */ |
| 94 | |
| 95 | /* |
| 96 | * sanity check: the subregion [substart, subend] should be |
| 97 | * smaller than the region included in sh_extent. |
| 98 | */ |
| 99 | if (substart < rbt->rb_ext->ex_start |
| 100 | || subend > rbt->rb_ext->ex_end) { |
| 101 | DPRINTF(("rbus: out of range\n" )); |
| 102 | return 1; |
| 103 | } |
| 104 | |
| 105 | if (decodesize == align) { |
| 106 | if(extent_alloc_subregion(rbt->rb_ext, substart, |
| 107 | subend, size, align, 0, exflags, &result)) { |
| 108 | return 1; |
| 109 | } |
| 110 | } else if (decodesize == 0) { |
| 111 | /* maybe, the register is overflowed. */ |
| 112 | |
| 113 | if (extent_alloc_subregion(rbt->rb_ext, addr, |
| 114 | addr + size, size, 1, 0, exflags, &result)) { |
| 115 | return 1; |
| 116 | } |
| 117 | } else { |
| 118 | |
| 119 | boundary = decodesize > align ? decodesize : align; |
| 120 | |
| 121 | search_addr = (substart & ~(boundary - 1)) + addr; |
| 122 | |
| 123 | if (search_addr < substart) { |
| 124 | search_addr += boundary; |
| 125 | } |
| 126 | |
| 127 | val = 1; |
| 128 | for (; search_addr + size <= subend; |
| 129 | search_addr += boundary) { |
| 130 | val = extent_alloc_subregion(rbt->rb_ext, |
| 131 | search_addr, search_addr + size, size, |
| 132 | align, 0, exflags, &result); |
| 133 | DPRINTF(("rbus: trying [%lx:%lx] %lx\n" , |
| 134 | (u_long)search_addr, |
| 135 | (u_long)search_addr + size, (u_long)align)); |
| 136 | if (val == 0) { |
| 137 | break; |
| 138 | } |
| 139 | } |
| 140 | if (val != 0) { |
| 141 | /* no space found */ |
| 142 | DPRINTF(("rbus: no space found\n" )); |
| 143 | return 1; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | if(md_space_map(rbt->rb_bt, result, size, flags, bshp)) { |
| 148 | /* map failed */ |
| 149 | extent_free(rbt->rb_ext, result, size, exflags); |
| 150 | return 1; |
| 151 | } |
| 152 | |
| 153 | if (addrp != NULL) { |
| 154 | *addrp = result + rbt->rb_offset; |
| 155 | } |
| 156 | return 0; |
| 157 | } else { |
| 158 | /* error!! */ |
| 159 | DPRINTF(("rbus: no rbus type\n" )); |
| 160 | return 1; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | |
| 165 | |
| 166 | |
| 167 | |
| 168 | int |
| 169 | rbus_space_free(rbus_tag_t rbt, bus_space_handle_t bsh, bus_size_t size, bus_addr_t *addrp) |
| 170 | { |
| 171 | int exflags = EX_FAST | EX_NOWAIT; |
| 172 | bus_addr_t addr; |
| 173 | int status = 1; |
| 174 | |
| 175 | if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) { |
| 176 | status = rbus_space_free(rbt->rb_parent, bsh, size, &addr); |
| 177 | } else if (rbt->rb_flags == RBUS_SPACE_SHARE || |
| 178 | rbt->rb_flags == RBUS_SPACE_DEDICATE) { |
| 179 | md_space_unmap(rbt->rb_bt, bsh, size, &addr); |
| 180 | |
| 181 | extent_free(rbt->rb_ext, addr, size, exflags); |
| 182 | |
| 183 | status = 0; |
| 184 | } else { |
| 185 | /* error. INVALID rbustag */ |
| 186 | status = 1; |
| 187 | } |
| 188 | if (status == 0 && addrp != NULL) { |
| 189 | *addrp = addr; |
| 190 | } |
| 191 | return status; |
| 192 | } |
| 193 | |
| 194 | |
| 195 | |
| 196 | /* |
| 197 | * static rbus_tag_t |
| 198 | * rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent, |
| 199 | * struct extent *ex, bus_addr_t start, bus_size_t end, |
| 200 | * bus_addr_t offset, int flags) |
| 201 | * |
| 202 | */ |
| 203 | static rbus_tag_t |
| 204 | rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent, struct extent *ex, bus_addr_t start, bus_addr_t end, bus_addr_t offset, int flags) |
| 205 | { |
| 206 | rbus_tag_t rb; |
| 207 | |
| 208 | /* sanity check */ |
| 209 | if (parent != NULL) { |
| 210 | if (start < parent->rb_start || end > parent->rb_end) { |
| 211 | /* |
| 212 | * out of range: [start, size] should be |
| 213 | * contained in parent space |
| 214 | */ |
| 215 | return 0; |
| 216 | /* Should I invoke panic? */ |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | if (NULL == (rb = (rbus_tag_t)malloc(sizeof(struct rbustag), M_DEVBUF, |
| 221 | M_NOWAIT))) { |
| 222 | panic("no memory for rbus instance" ); |
| 223 | } |
| 224 | |
| 225 | rb->rb_bt = bt; |
| 226 | rb->rb_parent = parent; |
| 227 | rb->rb_start = start; |
| 228 | rb->rb_end = end; |
| 229 | rb->rb_offset = offset; |
| 230 | rb->rb_flags = flags; |
| 231 | rb->rb_ext = ex; |
| 232 | |
| 233 | DPRINTF(("rbus_new_body: [%lx, %lx] type %s name [%s]\n" , |
| 234 | (u_long)start, (u_long)end, |
| 235 | flags == RBUS_SPACE_SHARE ? "share" : |
| 236 | flags == RBUS_SPACE_DEDICATE ? "dedicated" : |
| 237 | flags == RBUS_SPACE_ASK_PARENT ? "parent" : "invalid" , |
| 238 | ex != NULL ? ex->ex_name : "noname" )); |
| 239 | |
| 240 | return rb; |
| 241 | } |
| 242 | |
| 243 | |
| 244 | |
| 245 | /* |
| 246 | * rbus_tag_t rbus_new(rbus_tag_t parent, bus_addr_t start, bus_size_t |
| 247 | * size, bus_addr_t offset, int flags) |
| 248 | * |
| 249 | * This function makes a new child rbus instance. |
| 250 | */ |
| 251 | rbus_tag_t |
| 252 | rbus_new(rbus_tag_t parent, bus_addr_t start, bus_size_t size, bus_addr_t offset, int flags) |
| 253 | { |
| 254 | rbus_tag_t rb; |
| 255 | struct extent *ex = NULL; |
| 256 | bus_addr_t end = start + size; |
| 257 | |
| 258 | if (flags == RBUS_SPACE_SHARE) { |
| 259 | ex = parent->rb_ext; |
| 260 | } else if (flags == RBUS_SPACE_DEDICATE) { |
| 261 | if (NULL == (ex = extent_create("rbus" , start, end, |
| 262 | NULL, 0, EX_NOCOALESCE|EX_NOWAIT))) { |
| 263 | return NULL; |
| 264 | } |
| 265 | } else if (flags == RBUS_SPACE_ASK_PARENT) { |
| 266 | ex = NULL; |
| 267 | } else { |
| 268 | /* Invalid flag */ |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | rb = rbus_new_body(parent->rb_bt, parent, ex, start, start + size, |
| 273 | offset, flags); |
| 274 | |
| 275 | if ((rb == NULL) && (flags == RBUS_SPACE_DEDICATE)) { |
| 276 | extent_destroy(ex); |
| 277 | } |
| 278 | |
| 279 | return rb; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | |
| 284 | |
| 285 | /* |
| 286 | * rbus_tag_t rbus_new_root_delegate(bus_space_tag, bus_addr_t, |
| 287 | * bus_size_t, bus_addr_t offset) |
| 288 | * |
| 289 | * This function makes a root rbus instance. |
| 290 | */ |
| 291 | rbus_tag_t |
| 292 | rbus_new_root_delegate(bus_space_tag_t bt, bus_addr_t start, bus_size_t size, bus_addr_t offset) |
| 293 | { |
| 294 | rbus_tag_t rb; |
| 295 | struct extent *ex; |
| 296 | |
| 297 | if (NULL == (ex = extent_create("rbus root" , start, start + size, |
| 298 | NULL, 0, EX_NOCOALESCE|EX_NOWAIT))) { |
| 299 | return NULL; |
| 300 | } |
| 301 | |
| 302 | rb = rbus_new_body(bt, NULL, ex, start, start + size, offset, |
| 303 | RBUS_SPACE_DEDICATE); |
| 304 | |
| 305 | if (rb == NULL) { |
| 306 | extent_destroy(ex); |
| 307 | } |
| 308 | |
| 309 | return rb; |
| 310 | } |
| 311 | |
| 312 | |
| 313 | |
| 314 | /* |
| 315 | * rbus_tag_t rbus_new_root_share(bus_space_tag, struct extent *, |
| 316 | * bus_addr_t, bus_size_t, bus_addr_t offset) |
| 317 | * |
| 318 | * This function makes a root rbus instance. |
| 319 | */ |
| 320 | rbus_tag_t |
| 321 | rbus_new_root_share(bus_space_tag_t bt, struct extent *ex, bus_addr_t start, bus_size_t size, bus_addr_t offset) |
| 322 | { |
| 323 | /* sanity check */ |
| 324 | if (start < ex->ex_start || start + size > ex->ex_end) { |
| 325 | /* |
| 326 | * out of range: [start, size] should be contained in |
| 327 | * parent space |
| 328 | */ |
| 329 | return 0; |
| 330 | /* Should I invoke panic? */ |
| 331 | } |
| 332 | |
| 333 | return rbus_new_body(bt, NULL, ex, start, start + size, offset, |
| 334 | RBUS_SPACE_SHARE); |
| 335 | } |
| 336 | |
| 337 | |
| 338 | |
| 339 | |
| 340 | |
| 341 | /* |
| 342 | * int rbus_delete (rbus_tag_t rb) |
| 343 | * |
| 344 | * This function deletes the rbus structure pointed in the argument. |
| 345 | */ |
| 346 | int |
| 347 | rbus_delete(rbus_tag_t rb) |
| 348 | { |
| 349 | DPRINTF(("rbus_delete called [%s]\n" , |
| 350 | rb->rb_ext != NULL ? rb->rb_ext->ex_name : "noname" )); |
| 351 | if (rb->rb_flags == RBUS_SPACE_DEDICATE) { |
| 352 | extent_destroy(rb->rb_ext); |
| 353 | } |
| 354 | |
| 355 | free(rb, M_DEVBUF); |
| 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |