cia_dma.c revision 1.2
1 /* $NetBSD: cia_dma.c,v 1.2 1997/06/06 23:59:24 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 1.2 1997/06/06 23:59:24 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_sgmap __P((bus_dma_tag_t, bus_size_t, int, 63 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 64 65 void cia_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 66 67 int cia_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *, 68 bus_size_t, struct proc *, int)); 69 int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 70 bus_size_t, struct proc *, int)); 71 72 int cia_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t, 73 struct mbuf *, int)); 74 int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 75 struct mbuf *, int)); 76 77 int cia_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t, 78 struct uio *, int)); 79 int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 80 struct uio *, int)); 81 82 int cia_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t, 83 bus_dma_segment_t *, int, bus_size_t, int)); 84 int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 85 bus_dma_segment_t *, int, bus_size_t, int)); 86 87 void cia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 88 89 /* 90 * The direct-mapped DMA window begins at this PCI address. 91 */ 92 #define CIA_DIRECT_MAPPED_BASE 0x40000000 93 94 /* 95 * The 8M SGMAP-mapped DMA window begins at this PCI address. 96 */ 97 #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) 98 99 /* 100 * Macro to flush CIA scatter/gather TLB. 101 */ 102 #define CIA_TLB_INVALIDATE() \ 103 do { \ 104 alpha_mb(); \ 105 REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; \ 106 alpha_mb(); \ 107 } while (0) 108 109 void 110 cia_dma_init(ccp) 111 struct cia_config *ccp; 112 { 113 bus_addr_t tbase; 114 u_int32_t memcs_en; 115 bus_dma_tag_t t; 116 117 /* 118 * Initialize the DMA tag used for direct-mapped DMA. 119 */ 120 t = &ccp->cc_dmat_direct; 121 t->_cookie = ccp; 122 t->_get_tag = cia_dma_get_tag; 123 t->_dmamap_create = _bus_dmamap_create; 124 t->_dmamap_destroy = _bus_dmamap_destroy; 125 t->_dmamap_load = cia_bus_dmamap_load_direct; 126 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_direct; 127 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_direct; 128 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_direct; 129 t->_dmamap_unload = _bus_dmamap_unload; 130 t->_dmamap_sync = NULL; /* Nothing to do. */ 131 132 t->_dmamem_alloc = _bus_dmamem_alloc; 133 t->_dmamem_free = _bus_dmamem_free; 134 t->_dmamem_map = _bus_dmamem_map; 135 t->_dmamem_unmap = _bus_dmamem_unmap; 136 t->_dmamem_mmap = _bus_dmamem_mmap; 137 138 /* 139 * Initialize the DMA tag used for sgmap-mapped DMA. 140 */ 141 t = &ccp->cc_dmat_sgmap; 142 t->_cookie = ccp; 143 t->_get_tag = cia_dma_get_tag; 144 t->_dmamap_create = cia_bus_dmamap_create_sgmap; 145 t->_dmamap_destroy = cia_bus_dmamap_destroy_sgmap; 146 t->_dmamap_load = cia_bus_dmamap_load_sgmap; 147 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap; 148 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap; 149 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap; 150 t->_dmamap_unload = cia_bus_dmamap_unload_sgmap; 151 t->_dmamap_sync = NULL; /* Nothing to do. */ 152 153 t->_dmamem_alloc = _bus_dmamem_alloc; 154 t->_dmamem_free = _bus_dmamem_free; 155 t->_dmamem_map = _bus_dmamem_map; 156 t->_dmamem_unmap = _bus_dmamem_unmap; 157 t->_dmamem_mmap = _bus_dmamem_mmap; 158 159 /* 160 * The firmware has set up window 1 as a 1G direct-mapped DMA 161 * window beginning at 1G. We leave it alone. Leave window 162 * 0 alone until we reconfigure it for SGMAP-mapped DMA. 163 * Windows 2 and 3 are already disabled. 164 */ 165 166 /* 167 * Initialize the SGMAP if safe to do so. 168 */ 169 if (ccp->cc_mallocsafe) { 170 alpha_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap", 171 CIA_SGMAP_MAPPED_BASE, 0, (8*1024*1024), 172 sizeof(u_int64_t), NULL); 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 SGMAP-mapped DMA map. 244 */ 245 int 246 cia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 247 flags, dmamp) 248 bus_dma_tag_t t; 249 bus_size_t size; 250 int nsegments; 251 bus_size_t maxsegsz; 252 bus_size_t boundary; 253 int flags; 254 bus_dmamap_t *dmamp; 255 { 256 struct cia_config *ccp = t->_cookie; 257 struct alpha_sgmap_cookie *a; 258 bus_dmamap_t map; 259 int error; 260 261 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 262 boundary, flags, dmamp); 263 if (error) 264 return (error); 265 266 map = *dmamp; 267 268 a = malloc(sizeof(struct alpha_sgmap_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_sgmap_cookie)); 275 map->_dm_sgcookie = a; 276 277 if (flags & BUS_DMA_ALLOCNOW) { 278 error = alpha_sgmap_alloc(map, round_page(size), 279 &ccp->cc_sgmap, flags); 280 if (error) 281 cia_bus_dmamap_destroy_sgmap(t, map); 282 } 283 284 return (error); 285 } 286 287 /* 288 * Destroy a CIA SGMAP-mapped DMA map. 289 */ 290 void 291 cia_bus_dmamap_destroy_sgmap(t, map) 292 bus_dma_tag_t t; 293 bus_dmamap_t map; 294 { 295 struct cia_config *ccp = t->_cookie; 296 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 297 298 if (a->apdc_flags & APDC_HAS_SGMAP) 299 alpha_sgmap_free(&ccp->cc_sgmap, a); 300 301 free(a, M_DEVBUF); 302 _bus_dmamap_destroy(t, map); 303 } 304 305 /* 306 * Load a CIA direct-mapped DMA map with a linear buffer. 307 */ 308 int 309 cia_bus_dmamap_load_direct(t, map, buf, buflen, p, flags) 310 bus_dma_tag_t t; 311 bus_dmamap_t map; 312 void *buf; 313 bus_size_t buflen; 314 struct proc *p; 315 int flags; 316 { 317 318 return (_bus_dmamap_load_direct_common(t, map, buf, buflen, p, 319 flags, CIA_DIRECT_MAPPED_BASE)); 320 } 321 322 /* 323 * Load a CIA SGMAP-mapped DMA map with a linear buffer. 324 */ 325 int 326 cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 327 bus_dma_tag_t t; 328 bus_dmamap_t map; 329 void *buf; 330 bus_size_t buflen; 331 struct proc *p; 332 int flags; 333 { 334 struct cia_config *ccp = t->_cookie; 335 int error; 336 337 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 338 &ccp->cc_sgmap); 339 if (error == 0) 340 CIA_TLB_INVALIDATE(); 341 342 return (error); 343 } 344 345 /* 346 * Load a CIA direct-mapped DMA map with an mbuf chain. 347 */ 348 int 349 cia_bus_dmamap_load_mbuf_direct(t, map, m, flags) 350 bus_dma_tag_t t; 351 bus_dmamap_t map; 352 struct mbuf *m; 353 int flags; 354 { 355 356 return (_bus_dmamap_load_mbuf_direct_common(t, map, m, 357 flags, CIA_DIRECT_MAPPED_BASE)); 358 } 359 360 /* 361 * Load a CIA SGMAP-mapped DMA map with an mbuf chain. 362 */ 363 int 364 cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 365 bus_dma_tag_t t; 366 bus_dmamap_t map; 367 struct mbuf *m; 368 int flags; 369 { 370 struct cia_config *ccp = t->_cookie; 371 int error; 372 373 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, &ccp->cc_sgmap); 374 if (error == 0) 375 CIA_TLB_INVALIDATE(); 376 377 return (error); 378 } 379 380 /* 381 * Load a CIA direct-mapped DMA map with a uio. 382 */ 383 int 384 cia_bus_dmamap_load_uio_direct(t, map, uio, flags) 385 bus_dma_tag_t t; 386 bus_dmamap_t map; 387 struct uio *uio; 388 int flags; 389 { 390 391 return (_bus_dmamap_load_uio_direct_common(t, map, uio, 392 flags, CIA_DIRECT_MAPPED_BASE)); 393 } 394 395 /* 396 * Load a CIA SGMAP-mapped DMA map with a uio. 397 */ 398 int 399 cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 400 bus_dma_tag_t t; 401 bus_dmamap_t map; 402 struct uio *uio; 403 int flags; 404 { 405 struct cia_config *ccp = t->_cookie; 406 int error; 407 408 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, &ccp->cc_sgmap); 409 if (error == 0) 410 CIA_TLB_INVALIDATE(); 411 412 return (error); 413 } 414 415 /* 416 * Load a CIA direct-mapped DMA map with raw memory. 417 */ 418 int 419 cia_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) 420 bus_dma_tag_t t; 421 bus_dmamap_t map; 422 bus_dma_segment_t *segs; 423 int nsegs; 424 bus_size_t size; 425 int flags; 426 { 427 428 return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, 429 size, flags, CIA_DIRECT_MAPPED_BASE)); 430 } 431 432 /* 433 * Load a CIA SGMAP-mapped DMA map with raw memory. 434 */ 435 int 436 cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 437 bus_dma_tag_t t; 438 bus_dmamap_t map; 439 bus_dma_segment_t *segs; 440 int nsegs; 441 bus_size_t size; 442 int flags; 443 { 444 struct cia_config *ccp = t->_cookie; 445 int error; 446 447 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 448 &ccp->cc_sgmap); 449 if (error == 0) 450 CIA_TLB_INVALIDATE(); 451 452 return (error); 453 } 454 455 /* 456 * Unload a CIA DMA map. 457 */ 458 void 459 cia_bus_dmamap_unload_sgmap(t, map) 460 bus_dma_tag_t t; 461 bus_dmamap_t map; 462 { 463 struct cia_config *ccp = t->_cookie; 464 465 /* 466 * Invalidate any SGMAP page table entries used by this 467 * mapping. 468 */ 469 pci_sgmap_pte64_unload(t, map, &ccp->cc_sgmap); 470 CIA_TLB_INVALIDATE(); 471 472 /* 473 * Do the generic bits of the unload. 474 */ 475 _bus_dmamap_unload(t, map); 476 } 477
Indexes created Tue Sep 30 11:09:46 GMT 2025