cia_dma.c revision 1.1.2.1
1 /* $NetBSD: cia_dma.c,v 1.1.2.1 1997/05/23 21:44:42 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <machine/options.h> /* Config options headers */ 41 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 42 43 __KERNEL_RCSID(0, "$NetBSD: cia_dma.c,v 1.1.2.1 1997/05/23 21:44:42 thorpej Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/device.h> 49 #include <sys/malloc.h> 50 #include <vm/vm.h> 51 52 #define _ALPHA_BUS_DMA_PRIVATE 53 #include <machine/bus.h> 54 55 #include <dev/pci/pcireg.h> 56 #include <dev/pci/pcivar.h> 57 #include <alpha/pci/ciareg.h> 58 #include <alpha/pci/ciavar.h> 59 60 bus_dma_tag_t cia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 61 62 int cia_bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int, 63 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 64 int cia_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, 65 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 66 67 void cia_bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t)); 68 69 int cia_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *, 70 bus_size_t, struct proc *, int)); 71 int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 72 bus_size_t, struct proc *, int)); 73 74 int cia_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t, 75 struct mbuf *, int)); 76 int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 77 struct mbuf *, int)); 78 79 int cia_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t, 80 struct uio *, int)); 81 int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 82 struct uio *, int)); 83 84 int cia_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t, 85 bus_dma_segment_t *, int, bus_size_t, int)); 86 int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 87 bus_dma_segment_t *, int, bus_size_t, int)); 88 89 void cia_bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 90 91 /* 92 * The direct-mapped DMA window begins at this PCI address. 93 */ 94 #define CIA_DIRECT_MAPPED_BASE 0x40000000 95 96 /* 97 * The 8M SGMAP-mapped DMA window begins at this PCI address. 98 */ 99 #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) 100 101 /* 102 * Macro to flush CIA scatter/gather TLB. 103 */ 104 #define CIA_TLB_INVALIDATE() \ 105 do { \ 106 REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; \ 107 alpha_mb(); \ 108 } while (0) 109 110 void 111 cia_dma_init(ccp) 112 struct cia_config *ccp; 113 { 114 bus_addr_t tbase; 115 u_int32_t memcs_en; 116 bus_dma_tag_t t; 117 118 /* 119 * Initialize the DMA tag used for direct-mapped DMA. 120 */ 121 t = &ccp->cc_dmat_direct; 122 t->_cookie = ccp; 123 t->_get_tag = cia_dma_get_tag; 124 t->_dmamap_create = cia_bus_dmamap_create; 125 t->_dmamap_destroy = cia_bus_dmamap_destroy; 126 t->_dmamap_load = cia_bus_dmamap_load_direct; 127 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_direct; 128 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_direct; 129 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_direct; 130 t->_dmamap_unload = cia_bus_dmamap_unload; 131 t->_dmamap_sync = NULL; /* Nothing to do. */ 132 133 t->_dmamem_alloc = _bus_dmamem_alloc; 134 t->_dmamem_free = _bus_dmamem_free; 135 t->_dmamem_map = _bus_dmamem_map; 136 t->_dmamem_unmap = _bus_dmamem_unmap; 137 t->_dmamem_mmap = _bus_dmamem_mmap; 138 139 /* 140 * Initialize the DMA tag used for sgmap-mapped DMA. 141 */ 142 t = &ccp->cc_dmat_sgmap; 143 t->_cookie = ccp; 144 t->_get_tag = cia_dma_get_tag; 145 t->_dmamap_create = cia_bus_dmamap_create_sgmap; 146 t->_dmamap_destroy = cia_bus_dmamap_destroy; 147 t->_dmamap_load = cia_bus_dmamap_load_sgmap; 148 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap; 149 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap; 150 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap; 151 t->_dmamap_unload = cia_bus_dmamap_unload; 152 t->_dmamap_sync = NULL; /* Nothing to do. */ 153 154 t->_dmamem_alloc = _bus_dmamem_alloc; 155 t->_dmamem_free = _bus_dmamem_free; 156 t->_dmamem_map = _bus_dmamem_map; 157 t->_dmamem_unmap = _bus_dmamem_unmap; 158 t->_dmamem_mmap = _bus_dmamem_mmap; 159 160 /* 161 * The firmware has set up window 1 as a 1G direct-mapped DMA 162 * window beginning at 1G. We leave it alone. Leave window 163 * 0 alone until we reconfigure it for SGMAP-mapped DMA. 164 * Windows 2 and 3 are already disabled. 165 */ 166 167 /* 168 * Initialize the SGMAP if safe to do so. 169 */ 170 if (ccp->cc_mallocsafe) { 171 pci_dma_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap", 172 CIA_SGMAP_MAPPED_BASE, (8*1024*1024)); 173 174 /* Remember the MEMCS value. */ 175 alpha_mb(); 176 memcs_en = REGVAL(CIA_PCI_W0BASE) & CIA_PCI_WnBASE_MEMCS_EN; 177 178 /* Now disable window 0. */ 179 REGVAL(CIA_PCI_W0BASE) = 0; 180 alpha_mb(); 181 182 /* 183 * Set up window 0 as an 8MB SGMAP-mapped window 184 * starting at 8MB. 185 */ 186 tbase = ccp->cc_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT; 187 if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) 188 panic("cia_dma_init: bad page table address"); 189 REGVAL(CIA_PCI_T0BASE) = tbase; 190 REGVAL(CIA_PCI_W0MASK) = CIA_PCI_WnMASK_8M; 191 alpha_mb(); 192 193 REGVAL(CIA_PCI_W0BASE) = CIA_SGMAP_MAPPED_BASE | 194 CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN | memcs_en; 195 alpha_mb(); 196 197 CIA_TLB_INVALIDATE(); 198 } 199 200 /* XXX XXX BEGIN XXX XXX */ 201 { /* XXX */ 202 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 203 alpha_XXX_dmamap_or = CIA_DIRECT_MAPPED_BASE; /* XXX */ 204 } /* XXX */ 205 /* XXX XXX END XXX XXX */ 206 } 207 208 /* 209 * Return the bus dma tag to be used for the specified bus type. 210 * INTERNAL USE ONLY! 211 */ 212 bus_dma_tag_t 213 cia_dma_get_tag(t, bustype) 214 bus_dma_tag_t t; 215 alpha_bus_t bustype; 216 { 217 struct cia_config *ccp = t->_cookie; 218 219 switch (bustype) { 220 case ALPHA_BUS_PCI: 221 case ALPHA_BUS_EISA: 222 /* 223 * Systems with a CIA can only support 1G 224 * of memory, so we use the direct-mapped window 225 * on busses that have 32-bit DMA. 226 */ 227 return (&ccp->cc_dmat_direct); 228 229 case ALPHA_BUS_ISA: 230 /* 231 * ISA doesn't have enough address bits to use 232 * the direct-mapped DMA window, so we must use 233 * SGMAPs. 234 */ 235 return (&ccp->cc_dmat_sgmap); 236 237 default: 238 panic("cia_dma_get_tag: shouldn't be here, really..."); 239 } 240 } 241 242 /* 243 * Create a CIA DMA map. 244 */ 245 int 246 cia_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 247 bus_dma_tag_t t; 248 bus_size_t size; 249 int nsegments; 250 bus_size_t maxsegsz; 251 bus_size_t boundary; 252 int flags; 253 bus_dmamap_t *dmamp; 254 { 255 struct alpha_pci_dma_cookie *a; 256 bus_dmamap_t map; 257 int error; 258 259 /* Call common function to create the basic map. */ 260 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 261 flags, dmamp); 262 if (error) 263 return (error); 264 265 map = *dmamp; 266 267 /* Allocate PCI-specific housekeeping stuff. */ 268 a = malloc(sizeof(struct alpha_pci_dma_cookie), M_DEVBUF, 269 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK); 270 if (a == NULL) { 271 _bus_dmamap_destroy(t, map); 272 return (ENOMEM); 273 } 274 bzero(a, sizeof(struct alpha_pci_dma_cookie)); 275 map->_dm_cookie = a; 276 277 return (0); 278 } 279 280 int 281 cia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 282 flags, dmamp) 283 bus_dma_tag_t t; 284 bus_size_t size; 285 int nsegments; 286 bus_size_t maxsegsz; 287 bus_size_t boundary; 288 int flags; 289 bus_dmamap_t *dmamp; 290 { 291 struct cia_config *ccp = t->_cookie; 292 struct alpha_pci_dma_cookie *a; 293 bus_dmamap_t map; 294 int error; 295 296 error = cia_bus_dmamap_create(t, size, nsegments, maxsegsz, 297 boundary, flags, dmamp); 298 if (error) 299 return (error); 300 301 map = *dmamp; 302 a = map->_dm_cookie; 303 304 if (flags & BUS_DMA_ALLOCNOW) 305 error = pci_dma_sgmap_alloc(map, round_page(size), 306 &ccp->cc_sgmap, a, flags); 307 308 return (error); 309 } 310 311 /* 312 * Destroy a CIA DMA map. 313 */ 314 void 315 cia_bus_dmamap_destroy(t, map) 316 bus_dma_tag_t t; 317 bus_dmamap_t map; 318 { 319 struct cia_config *ccp = t->_cookie; 320 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 321 322 if (a->apdc_flags & APDC_HAS_SGMAP) 323 pci_dma_sgmap_free(&ccp->cc_sgmap, a); 324 325 free(map->_dm_cookie, M_DEVBUF); 326 _bus_dmamap_destroy(t, map); 327 } 328 329 /* 330 * Load a CIA direct-mapped DMA map with a linear buffer. 331 */ 332 int 333 cia_bus_dmamap_load_direct(t, map, buf, buflen, p, flags) 334 bus_dma_tag_t t; 335 bus_dmamap_t map; 336 void *buf; 337 bus_size_t buflen; 338 struct proc *p; 339 int flags; 340 { 341 342 return (_bus_dmamap_load_direct_common(t, map, buf, buflen, p, 343 flags, CIA_DIRECT_MAPPED_BASE)); 344 } 345 346 /* 347 * Load a CIA SGMAP-mapped DMA map with a linear buffer. 348 */ 349 int 350 cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 351 bus_dma_tag_t t; 352 bus_dmamap_t map; 353 void *buf; 354 bus_size_t buflen; 355 struct proc *p; 356 int flags; 357 { 358 struct cia_config *ccp = t->_cookie; 359 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 360 int error; 361 362 error = pci_dma_sgmap_load(t, map, buf, buflen, p, flags, 363 &ccp->cc_sgmap, a); 364 if (error == 0) 365 CIA_TLB_INVALIDATE(); 366 367 return (error); 368 } 369 370 /* 371 * Load a CIA direct-mapped DMA map with an mbuf chain. 372 */ 373 int 374 cia_bus_dmamap_load_mbuf_direct(t, map, m, flags) 375 bus_dma_tag_t t; 376 bus_dmamap_t map; 377 struct mbuf *m; 378 int flags; 379 { 380 381 return (_bus_dmamap_load_mbuf_direct_common(t, map, m, 382 flags, CIA_DIRECT_MAPPED_BASE)); 383 } 384 385 /* 386 * Load a CIA SGMAP-mapped DMA map with an mbuf chain. 387 */ 388 int 389 cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 390 bus_dma_tag_t t; 391 bus_dmamap_t map; 392 struct mbuf *m; 393 int flags; 394 { 395 struct cia_config *ccp = t->_cookie; 396 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 397 int error; 398 399 error = pci_dma_sgmap_load_mbuf(t, map, m, flags, &ccp->cc_sgmap, a); 400 if (error == 0) 401 CIA_TLB_INVALIDATE(); 402 403 return (error); 404 } 405 406 /* 407 * Load a CIA direct-mapped DMA map with a uio. 408 */ 409 int 410 cia_bus_dmamap_load_uio_direct(t, map, uio, flags) 411 bus_dma_tag_t t; 412 bus_dmamap_t map; 413 struct uio *uio; 414 int flags; 415 { 416 417 return (_bus_dmamap_load_uio_direct_common(t, map, uio, 418 flags, CIA_DIRECT_MAPPED_BASE)); 419 } 420 421 /* 422 * Load a CIA SGMAP-mapped DMA map with a uio. 423 */ 424 int 425 cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 426 bus_dma_tag_t t; 427 bus_dmamap_t map; 428 struct uio *uio; 429 int flags; 430 { 431 struct cia_config *ccp = t->_cookie; 432 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 433 int error; 434 435 error = pci_dma_sgmap_load_uio(t, map, uio, flags, &ccp->cc_sgmap, a); 436 if (error == 0) 437 CIA_TLB_INVALIDATE(); 438 439 return (error); 440 } 441 442 /* 443 * Load a CIA direct-mapped DMA map with raw memory. 444 */ 445 int 446 cia_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) 447 bus_dma_tag_t t; 448 bus_dmamap_t map; 449 bus_dma_segment_t *segs; 450 int nsegs; 451 bus_size_t size; 452 int flags; 453 { 454 455 return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, 456 size, flags, CIA_DIRECT_MAPPED_BASE)); 457 } 458 459 /* 460 * Load a CIA SGMAP-mapped DMA map with raw memory. 461 */ 462 int 463 cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 464 bus_dma_tag_t t; 465 bus_dmamap_t map; 466 bus_dma_segment_t *segs; 467 int nsegs; 468 bus_size_t size; 469 int flags; 470 { 471 struct cia_config *ccp = t->_cookie; 472 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 473 int error; 474 475 error = pci_dma_sgmap_load_raw(t, map, segs, nsegs, size, flags, 476 &ccp->cc_sgmap, a); 477 if (error == 0) 478 CIA_TLB_INVALIDATE(); 479 480 return (error); 481 } 482 483 /* 484 * Unload a CIA DMA map. 485 */ 486 void 487 cia_bus_dmamap_unload(t, map) 488 bus_dma_tag_t t; 489 bus_dmamap_t map; 490 { 491 struct cia_config *ccp = t->_cookie; 492 struct alpha_pci_dma_cookie *a = map->_dm_cookie; 493 494 /* 495 * Invalidate any SGMAP page table entries used by this 496 * mapping. 497 */ 498 if (a->apdc_flags & APDC_USING_SGMAP) { 499 pci_dma_sgmap_unload(t, map, &ccp->cc_sgmap, a); 500 CIA_TLB_INVALIDATE(); 501 } 502 503 /* 504 * Do the generic bits of the unload. 505 */ 506 _bus_dmamap_unload(t, map); 507 } 508
Indexes created Sat Oct 25 16:10:12 GMT 2025