dwlpx_dma.c revision 1.3
1 /* $NetBSD: dwlpx_dma.c,v 1.3 1997/09/02 13:19:27 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, SPEDWLPxL, 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: dwlpx_dma.c,v 1.3 1997/09/02 13:19:27 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/tlsb/tlsbreg.h> 57 #include <alpha/tlsb/kftxxvar.h> 58 #include <alpha/tlsb/kftxxreg.h> 59 #include <alpha/pci/dwlpxreg.h> 60 #include <alpha/pci/dwlpxvar.h> 61 #include <alpha/pci/pci_kn8ae.h> 62 63 bus_dma_tag_t dwlpx_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 64 65 int dwlpx_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, 66 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 67 68 void dwlpx_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 69 70 int dwlpx_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *, 71 bus_size_t, struct proc *, int)); 72 int dwlpx_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 73 bus_size_t, struct proc *, int)); 74 75 int dwlpx_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t, 76 struct mbuf *, int)); 77 int dwlpx_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 78 struct mbuf *, int)); 79 80 int dwlpx_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t, 81 struct uio *, int)); 82 int dwlpx_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 83 struct uio *, int)); 84 85 int dwlpx_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t, 86 bus_dma_segment_t *, int, bus_size_t, int)); 87 int dwlpx_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 88 bus_dma_segment_t *, int, bus_size_t, int)); 89 90 void dwlpx_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 91 92 /* 93 * The direct-mapped DMA window begins at this PCI address. 94 */ 95 #define DWLPx_DIRECT_MAPPED_BASE 0x40000000 96 97 void 98 dwlpx_dma_init(ccp) 99 struct dwlpx_config *ccp; 100 { 101 char *exname; 102 bus_dma_tag_t t; 103 u_int32_t *page_table; 104 int i; 105 106 /* 107 * Initialize the DMA tag used for direct-mapped DMA. 108 */ 109 t = &ccp->cc_dmat_direct; 110 t->_cookie = ccp; 111 t->_get_tag = dwlpx_dma_get_tag; 112 t->_dmamap_create = _bus_dmamap_create; 113 t->_dmamap_destroy = _bus_dmamap_destroy; 114 t->_dmamap_load = dwlpx_bus_dmamap_load_direct; 115 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_direct; 116 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_direct; 117 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_direct; 118 t->_dmamap_unload = _bus_dmamap_unload; 119 t->_dmamap_sync = NULL; /* Nothing to do. */ 120 121 t->_dmamem_alloc = _bus_dmamem_alloc; 122 t->_dmamem_free = _bus_dmamem_free; 123 t->_dmamem_map = _bus_dmamem_map; 124 t->_dmamem_unmap = _bus_dmamem_unmap; 125 t->_dmamem_mmap = _bus_dmamem_mmap; 126 127 /* 128 * Initialize the DMA tag used for sgmap-mapped DMA. 129 */ 130 t = &ccp->cc_dmat_sgmap; 131 t->_cookie = ccp; 132 t->_get_tag = dwlpx_dma_get_tag; 133 t->_dmamap_create = dwlpx_bus_dmamap_create_sgmap; 134 t->_dmamap_destroy = dwlpx_bus_dmamap_destroy_sgmap; 135 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 136 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 137 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 138 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 139 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 140 t->_dmamap_sync = NULL; /* Nothing to do. */ 141 142 t->_dmamem_alloc = _bus_dmamem_alloc; 143 t->_dmamem_free = _bus_dmamem_free; 144 t->_dmamem_map = _bus_dmamem_map; 145 t->_dmamem_unmap = _bus_dmamem_unmap; 146 t->_dmamem_mmap = _bus_dmamem_mmap; 147 148 /* 149 * A few notes about SGMAP-mapped DMA on the DWLPx: 150 * 151 * The DWLPx has PCIA-resident SRAM that is used for 152 * the SGMAP page table; there is no TLB. The DWLPA 153 * has room for 32K entries, yielding a total of 256M 154 * of sgva space. The DWLPB has 32K entries or 128K 155 * entries, depending on TBIT, yielding wither 256M or 156 * 1G of sgva space. 157 * 158 * This sgva space must be shared across all windows 159 * that wish to use SGMAP-mapped DMA; make sure to 160 * adjust the "sgvabase" argument to alpha_sgmap_init() 161 * accordingly if you create more than one SGMAP-mapped 162 * window. Note that sgvabase != window base. The former 163 * is used to compute indexes into the page table only. 164 * 165 * In the current implementation, we follow the lead of 166 * the workstation chipsets; the first window is an 8M 167 * window SGMAP-mapped mapped at 8M, and the second window 168 * is a 1G window direct-mapped mapped at 1G. 169 */ 170 171 /* 172 * Initialize the page table. 173 */ 174 page_table = 175 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 176 for (i = 0; i < (32*1024); i++) 177 page_table[i] = 0; 178 alpha_mb(); 179 180 /* 181 * Initialize the SGMAP for window A: 182 * 183 * Size: 8M 184 * Window base: 8M 185 * SGVA base: 0 186 */ 187 exname = malloc(16, M_DEVBUF, M_NOWAIT); 188 if (exname == NULL) 189 panic("dwlpx_dma_init"); 190 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 191 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, 192 (8*1024*1024), 0, (8*1024*1024), sizeof(u_int32_t), 193 (void *)page_table); 194 195 /* 196 * Set up DMA windows for this DWLPx. 197 * 198 * Do this even for all HPCs- even for the nonexistent 199 * one on hose zero of a KFTIA. 200 */ 201 for (i = 0; i < NHPC; i++) { 202 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_8M; 203 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 204 alpha_mb(); 205 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 206 (8*1024*1024) | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 207 alpha_mb(); 208 209 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = PCIA_WMASK_1G; 210 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 211 alpha_mb(); 212 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 213 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 214 alpha_mb(); 215 216 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = 0; 217 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 218 alpha_mb(); 219 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 0; 220 alpha_mb(); 221 } 222 223 /* XXX XXX BEGIN XXX XXX */ 224 { /* XXX */ 225 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 226 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 227 } /* XXX */ 228 /* XXX XXX END XXX XXX */ 229 } 230 231 /* 232 * Return the bus dma tag to be used for the specified bus type. 233 * INTERNAL USE ONLY! 234 */ 235 bus_dma_tag_t 236 dwlpx_dma_get_tag(t, bustype) 237 bus_dma_tag_t t; 238 alpha_bus_t bustype; 239 { 240 struct dwlpx_config *ccp = t->_cookie; 241 242 switch (bustype) { 243 case ALPHA_BUS_PCI: 244 case ALPHA_BUS_EISA: 245 /* 246 * XXX FIXME! 247 * XXX If the system has more than 1G of RAM, 248 * XXX we need to use SGMAPs, or some combination 249 * XXX of direct-mapped and SGMAP-mapped DMA. 250 */ 251 return (&ccp->cc_dmat_direct); 252 253 case ALPHA_BUS_ISA: 254 /* 255 * ISA doesn't have enough address bits to use 256 * the direct-mapped DMA window, so we must use 257 * SGMAPs. 258 */ 259 return (&ccp->cc_dmat_sgmap); 260 261 default: 262 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 263 } 264 } 265 266 /* 267 * Create a DWLPx SGMAP-mapped DMA map. 268 */ 269 int 270 dwlpx_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 271 flags, dmamp) 272 bus_dma_tag_t t; 273 bus_size_t size; 274 int nsegments; 275 bus_size_t maxsegsz; 276 bus_size_t boundary; 277 int flags; 278 bus_dmamap_t *dmamp; 279 { 280 struct dwlpx_config *ccp = t->_cookie; 281 struct alpha_sgmap_cookie *a; 282 bus_dmamap_t map; 283 int error; 284 285 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 286 boundary, flags, dmamp); 287 if (error) 288 return (error); 289 290 map = *dmamp; 291 292 a = malloc(sizeof(struct alpha_sgmap_cookie), M_DEVBUF, 293 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK); 294 if (a == NULL) { 295 _bus_dmamap_destroy(t, map); 296 return (ENOMEM); 297 } 298 bzero(a, sizeof(struct alpha_sgmap_cookie)); 299 map->_dm_sgcookie = a; 300 301 if (flags & BUS_DMA_ALLOCNOW) { 302 error = alpha_sgmap_alloc(map, round_page(size), 303 &ccp->cc_sgmap, flags); 304 if (error) 305 dwlpx_bus_dmamap_destroy_sgmap(t, map); 306 } 307 308 return (error); 309 } 310 311 /* 312 * Destroy a DWLPx SGMAP-mapped DMA map. 313 */ 314 void 315 dwlpx_bus_dmamap_destroy_sgmap(t, map) 316 bus_dma_tag_t t; 317 bus_dmamap_t map; 318 { 319 struct dwlpx_config *ccp = t->_cookie; 320 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 321 322 if (a->apdc_flags & APDC_HAS_SGMAP) 323 alpha_sgmap_free(&ccp->cc_sgmap, a); 324 325 free(a, M_DEVBUF); 326 _bus_dmamap_destroy(t, map); 327 } 328 329 /* 330 * Load a DWLPx direct-mapped DMA map with a linear buffer. 331 */ 332 int 333 dwlpx_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, DWLPx_DIRECT_MAPPED_BASE)); 344 } 345 346 /* 347 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 348 */ 349 int 350 dwlpx_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 dwlpx_config *ccp = t->_cookie; 359 360 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 361 &ccp->cc_sgmap)); 362 } 363 364 /* 365 * Load a DWLPx direct-mapped DMA map with an mbuf chain. 366 */ 367 int 368 dwlpx_bus_dmamap_load_mbuf_direct(t, map, m, flags) 369 bus_dma_tag_t t; 370 bus_dmamap_t map; 371 struct mbuf *m; 372 int flags; 373 { 374 375 return (_bus_dmamap_load_mbuf_direct_common(t, map, m, 376 flags, DWLPx_DIRECT_MAPPED_BASE)); 377 } 378 379 /* 380 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 381 */ 382 int 383 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 384 bus_dma_tag_t t; 385 bus_dmamap_t map; 386 struct mbuf *m; 387 int flags; 388 { 389 struct dwlpx_config *ccp = t->_cookie; 390 391 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, &ccp->cc_sgmap)); 392 } 393 394 /* 395 * Load a DWLPx direct-mapped DMA map with a uio. 396 */ 397 int 398 dwlpx_bus_dmamap_load_uio_direct(t, map, uio, flags) 399 bus_dma_tag_t t; 400 bus_dmamap_t map; 401 struct uio *uio; 402 int flags; 403 { 404 405 return (_bus_dmamap_load_uio_direct_common(t, map, uio, 406 flags, DWLPx_DIRECT_MAPPED_BASE)); 407 } 408 409 /* 410 * Load a DWLPx SGMAP-mapped DMA map with a uio. 411 */ 412 int 413 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 414 bus_dma_tag_t t; 415 bus_dmamap_t map; 416 struct uio *uio; 417 int flags; 418 { 419 struct dwlpx_config *ccp = t->_cookie; 420 421 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, &ccp->cc_sgmap)); 422 } 423 424 /* 425 * Load a DWLPx direct-mapped DMA map with raw memory. 426 */ 427 int 428 dwlpx_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) 429 bus_dma_tag_t t; 430 bus_dmamap_t map; 431 bus_dma_segment_t *segs; 432 int nsegs; 433 bus_size_t size; 434 int flags; 435 { 436 437 return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, 438 size, flags, DWLPx_DIRECT_MAPPED_BASE)); 439 } 440 441 /* 442 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 443 */ 444 int 445 dwlpx_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 446 bus_dma_tag_t t; 447 bus_dmamap_t map; 448 bus_dma_segment_t *segs; 449 int nsegs; 450 bus_size_t size; 451 int flags; 452 { 453 struct dwlpx_config *ccp = t->_cookie; 454 455 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 456 &ccp->cc_sgmap)); 457 } 458 459 /* 460 * Unload a DWLPx DMA map. 461 */ 462 void 463 dwlpx_bus_dmamap_unload_sgmap(t, map) 464 bus_dma_tag_t t; 465 bus_dmamap_t map; 466 { 467 struct dwlpx_config *ccp = t->_cookie; 468 469 /* 470 * Invalidate any SGMAP page table entries used by this 471 * mapping. 472 */ 473 pci_sgmap_pte32_unload(t, map, &ccp->cc_sgmap); 474 475 /* 476 * Do the generic bits of the unload. 477 */ 478 _bus_dmamap_unload(t, map); 479 } 480
Indexes created Mon Oct 27 17:09:47 GMT 2025