cia_dma.c revision 1.2.6.1
1 /* $NetBSD: cia_dma.c,v 1.2.6.1 1997/09/04 00:53:28 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 <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 41 42 __KERNEL_RCSID(0, "$NetBSD: cia_dma.c,v 1.2.6.1 1997/09/04 00:53:28 thorpej Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/device.h> 48 #include <sys/malloc.h> 49 #include <vm/vm.h> 50 51 #define _ALPHA_BUS_DMA_PRIVATE 52 #include <machine/bus.h> 53 54 #include <dev/pci/pcireg.h> 55 #include <dev/pci/pcivar.h> 56 #include <alpha/pci/ciareg.h> 57 #include <alpha/pci/ciavar.h> 58 59 bus_dma_tag_t cia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 60 61 int cia_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, 62 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 63 64 void cia_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 65 66 int cia_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *, 67 bus_size_t, struct proc *, int)); 68 int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 69 bus_size_t, struct proc *, int)); 70 71 int cia_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t, 72 struct mbuf *, int)); 73 int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 74 struct mbuf *, int)); 75 76 int cia_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t, 77 struct uio *, int)); 78 int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 79 struct uio *, int)); 80 81 int cia_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t, 82 bus_dma_segment_t *, int, bus_size_t, int)); 83 int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 84 bus_dma_segment_t *, int, bus_size_t, int)); 85 86 void cia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 87 88 /* 89 * The direct-mapped DMA window begins at this PCI address. 90 */ 91 #define CIA_DIRECT_MAPPED_BASE 0x40000000 92 93 /* 94 * The 8M SGMAP-mapped DMA window begins at this PCI address. 95 */ 96 #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) 97 98 /* 99 * Macro to flush CIA scatter/gather TLB. 100 */ 101 #define CIA_TLB_INVALIDATE() \ 102 do { \ 103 alpha_mb(); \ 104 REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; \ 105 alpha_mb(); \ 106 } while (0) 107 108 void 109 cia_dma_init(ccp) 110 struct cia_config *ccp; 111 { 112 bus_addr_t tbase; 113 u_int32_t memcs_en; 114 bus_dma_tag_t t; 115 116 /* 117 * Initialize the DMA tag used for direct-mapped DMA. 118 */ 119 t = &ccp->cc_dmat_direct; 120 t->_cookie = ccp; 121 t->_get_tag = cia_dma_get_tag; 122 t->_dmamap_create = _bus_dmamap_create; 123 t->_dmamap_destroy = _bus_dmamap_destroy; 124 t->_dmamap_load = cia_bus_dmamap_load_direct; 125 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_direct; 126 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_direct; 127 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_direct; 128 t->_dmamap_unload = _bus_dmamap_unload; 129 t->_dmamap_sync = NULL; /* Nothing to do. */ 130 131 t->_dmamem_alloc = _bus_dmamem_alloc; 132 t->_dmamem_free = _bus_dmamem_free; 133 t->_dmamem_map = _bus_dmamem_map; 134 t->_dmamem_unmap = _bus_dmamem_unmap; 135 t->_dmamem_mmap = _bus_dmamem_mmap; 136 137 /* 138 * Initialize the DMA tag used for sgmap-mapped DMA. 139 */ 140 t = &ccp->cc_dmat_sgmap; 141 t->_cookie = ccp; 142 t->_get_tag = cia_dma_get_tag; 143 t->_dmamap_create = cia_bus_dmamap_create_sgmap; 144 t->_dmamap_destroy = cia_bus_dmamap_destroy_sgmap; 145 t->_dmamap_load = cia_bus_dmamap_load_sgmap; 146 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap; 147 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap; 148 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap; 149 t->_dmamap_unload = cia_bus_dmamap_unload_sgmap; 150 t->_dmamap_sync = NULL; /* Nothing to do. */ 151 152 t->_dmamem_alloc = _bus_dmamem_alloc; 153 t->_dmamem_free = _bus_dmamem_free; 154 t->_dmamem_map = _bus_dmamem_map; 155 t->_dmamem_unmap = _bus_dmamem_unmap; 156 t->_dmamem_mmap = _bus_dmamem_mmap; 157 158 /* 159 * The firmware has set up window 1 as a 1G direct-mapped DMA 160 * window beginning at 1G. We leave it alone. Leave window 161 * 0 alone until we reconfigure it for SGMAP-mapped DMA. 162 * Windows 2 and 3 are already disabled. 163 */ 164 165 /* 166 * Initialize the SGMAP if safe to do so. 167 */ 168 if (ccp->cc_mallocsafe) { 169 alpha_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap", 170 CIA_SGMAP_MAPPED_BASE, 0, (8*1024*1024), 171 sizeof(u_int64_t), NULL); 172 173 /* Remember the MEMCS value. */ 174 alpha_mb(); 175 memcs_en = REGVAL(CIA_PCI_W0BASE) & CIA_PCI_WnBASE_MEMCS_EN; 176 177 /* Now disable window 0. */ 178 REGVAL(CIA_PCI_W0BASE) = 0; 179 alpha_mb(); 180 181 /* 182 * Set up window 0 as an 8MB SGMAP-mapped window 183 * starting at 8MB. 184 */ 185 tbase = ccp->cc_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT; 186 if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) 187 panic("cia_dma_init: bad page table address"); 188 REGVAL(CIA_PCI_T0BASE) = tbase; 189 REGVAL(CIA_PCI_W0MASK) = CIA_PCI_WnMASK_8M; 190 alpha_mb(); 191 192 REGVAL(CIA_PCI_W0BASE) = CIA_SGMAP_MAPPED_BASE | 193 CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN | memcs_en; 194 alpha_mb(); 195 196 CIA_TLB_INVALIDATE(); 197 } 198 199 /* XXX XXX BEGIN XXX XXX */ 200 { /* XXX */ 201 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 202 alpha_XXX_dmamap_or = CIA_DIRECT_MAPPED_BASE; /* XXX */ 203 } /* XXX */ 204 /* XXX XXX END XXX XXX */ 205 } 206 207 /* 208 * Return the bus dma tag to be used for the specified bus type. 209 * INTERNAL USE ONLY! 210 */ 211 bus_dma_tag_t 212 cia_dma_get_tag(t, bustype) 213 bus_dma_tag_t t; 214 alpha_bus_t bustype; 215 { 216 struct cia_config *ccp = t->_cookie; 217 218 switch (bustype) { 219 case ALPHA_BUS_PCI: 220 case ALPHA_BUS_EISA: 221 /* 222 * Systems with a CIA can only support 1G 223 * of memory, so we use the direct-mapped window 224 * on busses that have 32-bit DMA. 225 */ 226 return (&ccp->cc_dmat_direct); 227 228 case ALPHA_BUS_ISA: 229 /* 230 * ISA doesn't have enough address bits to use 231 * the direct-mapped DMA window, so we must use 232 * SGMAPs. 233 */ 234 return (&ccp->cc_dmat_sgmap); 235 236 default: 237 panic("cia_dma_get_tag: shouldn't be here, really..."); 238 } 239 } 240 241 /* 242 * Create a CIA SGMAP-mapped DMA map. 243 */ 244 int 245 cia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 246 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 cia_config *ccp = t->_cookie; 256 struct alpha_sgmap_cookie *a; 257 bus_dmamap_t map; 258 int error; 259 260 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 261 boundary, flags, dmamp); 262 if (error) 263 return (error); 264 265 map = *dmamp; 266 267 a = malloc(sizeof(struct alpha_sgmap_cookie), M_DEVBUF, 268 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK); 269 if (a == NULL) { 270 _bus_dmamap_destroy(t, map); 271 return (ENOMEM); 272 } 273 bzero(a, sizeof(struct alpha_sgmap_cookie)); 274 map->_dm_sgcookie = a; 275 276 if (flags & BUS_DMA_ALLOCNOW) { 277 error = alpha_sgmap_alloc(map, round_page(size), 278 &ccp->cc_sgmap, flags); 279 if (error) 280 cia_bus_dmamap_destroy_sgmap(t, map); 281 } 282 283 return (error); 284 } 285 286 /* 287 * Destroy a CIA SGMAP-mapped DMA map. 288 */ 289 void 290 cia_bus_dmamap_destroy_sgmap(t, map) 291 bus_dma_tag_t t; 292 bus_dmamap_t map; 293 { 294 struct cia_config *ccp = t->_cookie; 295 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 296 297 if (a->apdc_flags & APDC_HAS_SGMAP) 298 alpha_sgmap_free(&ccp->cc_sgmap, a); 299 300 free(a, M_DEVBUF); 301 _bus_dmamap_destroy(t, map); 302 } 303 304 /* 305 * Load a CIA direct-mapped DMA map with a linear buffer. 306 */ 307 int 308 cia_bus_dmamap_load_direct(t, map, buf, buflen, p, flags) 309 bus_dma_tag_t t; 310 bus_dmamap_t map; 311 void *buf; 312 bus_size_t buflen; 313 struct proc *p; 314 int flags; 315 { 316 317 return (_bus_dmamap_load_direct_common(t, map, buf, buflen, p, 318 flags, CIA_DIRECT_MAPPED_BASE)); 319 } 320 321 /* 322 * Load a CIA SGMAP-mapped DMA map with a linear buffer. 323 */ 324 int 325 cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 326 bus_dma_tag_t t; 327 bus_dmamap_t map; 328 void *buf; 329 bus_size_t buflen; 330 struct proc *p; 331 int flags; 332 { 333 struct cia_config *ccp = t->_cookie; 334 int error; 335 336 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 337 &ccp->cc_sgmap); 338 if (error == 0) 339 CIA_TLB_INVALIDATE(); 340 341 return (error); 342 } 343 344 /* 345 * Load a CIA direct-mapped DMA map with an mbuf chain. 346 */ 347 int 348 cia_bus_dmamap_load_mbuf_direct(t, map, m, flags) 349 bus_dma_tag_t t; 350 bus_dmamap_t map; 351 struct mbuf *m; 352 int flags; 353 { 354 355 return (_bus_dmamap_load_mbuf_direct_common(t, map, m, 356 flags, CIA_DIRECT_MAPPED_BASE)); 357 } 358 359 /* 360 * Load a CIA SGMAP-mapped DMA map with an mbuf chain. 361 */ 362 int 363 cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 364 bus_dma_tag_t t; 365 bus_dmamap_t map; 366 struct mbuf *m; 367 int flags; 368 { 369 struct cia_config *ccp = t->_cookie; 370 int error; 371 372 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, &ccp->cc_sgmap); 373 if (error == 0) 374 CIA_TLB_INVALIDATE(); 375 376 return (error); 377 } 378 379 /* 380 * Load a CIA direct-mapped DMA map with a uio. 381 */ 382 int 383 cia_bus_dmamap_load_uio_direct(t, map, uio, flags) 384 bus_dma_tag_t t; 385 bus_dmamap_t map; 386 struct uio *uio; 387 int flags; 388 { 389 390 return (_bus_dmamap_load_uio_direct_common(t, map, uio, 391 flags, CIA_DIRECT_MAPPED_BASE)); 392 } 393 394 /* 395 * Load a CIA SGMAP-mapped DMA map with a uio. 396 */ 397 int 398 cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 399 bus_dma_tag_t t; 400 bus_dmamap_t map; 401 struct uio *uio; 402 int flags; 403 { 404 struct cia_config *ccp = t->_cookie; 405 int error; 406 407 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, &ccp->cc_sgmap); 408 if (error == 0) 409 CIA_TLB_INVALIDATE(); 410 411 return (error); 412 } 413 414 /* 415 * Load a CIA direct-mapped DMA map with raw memory. 416 */ 417 int 418 cia_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) 419 bus_dma_tag_t t; 420 bus_dmamap_t map; 421 bus_dma_segment_t *segs; 422 int nsegs; 423 bus_size_t size; 424 int flags; 425 { 426 427 return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, 428 size, flags, CIA_DIRECT_MAPPED_BASE)); 429 } 430 431 /* 432 * Load a CIA SGMAP-mapped DMA map with raw memory. 433 */ 434 int 435 cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 436 bus_dma_tag_t t; 437 bus_dmamap_t map; 438 bus_dma_segment_t *segs; 439 int nsegs; 440 bus_size_t size; 441 int flags; 442 { 443 struct cia_config *ccp = t->_cookie; 444 int error; 445 446 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 447 &ccp->cc_sgmap); 448 if (error == 0) 449 CIA_TLB_INVALIDATE(); 450 451 return (error); 452 } 453 454 /* 455 * Unload a CIA DMA map. 456 */ 457 void 458 cia_bus_dmamap_unload_sgmap(t, map) 459 bus_dma_tag_t t; 460 bus_dmamap_t map; 461 { 462 struct cia_config *ccp = t->_cookie; 463 464 /* 465 * Invalidate any SGMAP page table entries used by this 466 * mapping. 467 */ 468 pci_sgmap_pte64_unload(t, map, &ccp->cc_sgmap); 469 CIA_TLB_INVALIDATE(); 470 471 /* 472 * Do the generic bits of the unload. 473 */ 474 _bus_dmamap_unload(t, map); 475 } 476
Indexes created Sat Oct 25 16:10:12 GMT 2025