dwlpx_dma.c revision 1.1.2.3
1 /* $NetBSD: dwlpx_dma.c,v 1.1.2.3 1997/06/05 23:57:05 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 <machine/options.h> /* Config options headers */ 41 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 42 43 __KERNEL_RCSID(0, "$NetBSD: dwlpx_dma.c,v 1.1.2.3 1997/06/05 23:57:05 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/tlsb/tlsbreg.h> 58 #include <alpha/tlsb/kftxxvar.h> 59 #include <alpha/tlsb/kftxxreg.h> 60 #include <alpha/pci/dwlpxreg.h> 61 #include <alpha/pci/dwlpxvar.h> 62 #include <alpha/pci/pci_kn8ae.h> 63 64 bus_dma_tag_t dwlpx_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 65 66 int dwlpx_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, 67 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 68 69 void dwlpx_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 70 71 int dwlpx_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *, 72 bus_size_t, struct proc *, int)); 73 int dwlpx_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 74 bus_size_t, struct proc *, int)); 75 76 int dwlpx_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t, 77 struct mbuf *, int)); 78 int dwlpx_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 79 struct mbuf *, int)); 80 81 int dwlpx_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t, 82 struct uio *, int)); 83 int dwlpx_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 84 struct uio *, int)); 85 86 int dwlpx_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t, 87 bus_dma_segment_t *, int, bus_size_t, int)); 88 int dwlpx_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 89 bus_dma_segment_t *, int, bus_size_t, int)); 90 91 void dwlpx_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 92 93 /* 94 * The direct-mapped DMA window begins at this PCI address. 95 */ 96 #define DWLPx_DIRECT_MAPPED_BASE 0x40000000 97 98 void 99 dwlpx_dma_init(ccp) 100 struct dwlpx_config *ccp; 101 { 102 char *exname; 103 bus_dma_tag_t t; 104 u_int32_t *page_table; 105 int i; 106 107 /* 108 * Initialize the DMA tag used for direct-mapped DMA. 109 */ 110 t = &ccp->cc_dmat_direct; 111 t->_cookie = ccp; 112 t->_get_tag = dwlpx_dma_get_tag; 113 t->_dmamap_create = _bus_dmamap_create; 114 t->_dmamap_destroy = _bus_dmamap_destroy; 115 t->_dmamap_load = dwlpx_bus_dmamap_load_direct; 116 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_direct; 117 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_direct; 118 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_direct; 119 t->_dmamap_unload = _bus_dmamap_unload; 120 t->_dmamap_sync = NULL; /* Nothing to do. */ 121 122 t->_dmamem_alloc = _bus_dmamem_alloc; 123 t->_dmamem_free = _bus_dmamem_free; 124 t->_dmamem_map = _bus_dmamem_map; 125 t->_dmamem_unmap = _bus_dmamem_unmap; 126 t->_dmamem_mmap = _bus_dmamem_mmap; 127 128 /* 129 * Initialize the DMA tag used for sgmap-mapped DMA. 130 */ 131 t = &ccp->cc_dmat_sgmap; 132 t->_cookie = ccp; 133 t->_get_tag = dwlpx_dma_get_tag; 134 t->_dmamap_create = dwlpx_bus_dmamap_create_sgmap; 135 t->_dmamap_destroy = dwlpx_bus_dmamap_destroy_sgmap; 136 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 137 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 138 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 139 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 140 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 141 t->_dmamap_sync = NULL; /* Nothing to do. */ 142 143 t->_dmamem_alloc = _bus_dmamem_alloc; 144 t->_dmamem_free = _bus_dmamem_free; 145 t->_dmamem_map = _bus_dmamem_map; 146 t->_dmamem_unmap = _bus_dmamem_unmap; 147 t->_dmamem_mmap = _bus_dmamem_mmap; 148 149 /* 150 * A few notes about SGMAP-mapped DMA on the DWLPx: 151 * 152 * The DWLPx has PCIA-resident SRAM that is used for 153 * the SGMAP page table; there is no TLB. The DWLPA 154 * has room for 32K entries, yielding a total of 256M 155 * of sgva space. The DWLPB has 32K entries or 128K 156 * entries, depending on TBIT, yielding wither 256M or 157 * 1G of sgva space. 158 * 159 * This sgva space must be shared across all windows 160 * that wish to use SGMAP-mapped DMA; make sure to 161 * adjust the "sgvabase" argument to alpha_sgmap_init() 162 * accordingly if you create more than one SGMAP-mapped 163 * window. Note that sgvabase != window base. The former 164 * is used to compute indexes into the page table only. 165 * 166 * In the current implementation, we follow the lead of 167 * the workstation chipsets; the first window is an 8M 168 * window SGMAP-mapped mapped at 8M, and the second window 169 * is a 1G window direct-mapped mapped at 1G. 170 */ 171 172 /* 173 * Initialize the page table. 174 */ 175 page_table = 176 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 177 for (i = 0; i < (32*1024); i++) 178 page_table[i] = 0; 179 alpha_mb(); 180 181 /* 182 * Initialize the SGMAP for window A: 183 * 184 * Size: 8M 185 * Window base: 8M 186 * SGVA base: 0 187 */ 188 exname = malloc(16, M_DEVBUF, M_NOWAIT); 189 if (exname == NULL) 190 panic("dwlpx_dma_init"); 191 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 192 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, 193 (8*1024*1024), 0, (8*1024*1024), sizeof(u_int32_t), 194 (void *)page_table); 195 196 /* 197 * Set up DMA windows for this DWLPx. 198 * 199 * Do this even for all HPCs- even for the nonexistent 200 * one on hose zero of a KFTIA. 201 */ 202 for (i = 0; i < NHPC; i++) { 203 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_8M; 204 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 205 alpha_mb(); 206 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 207 (8*1024*1024) | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 208 alpha_mb(); 209 210 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = PCIA_WMASK_1G; 211 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 212 alpha_mb(); 213 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 214 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 215 alpha_mb(); 216 217 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = 0; 218 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 219 alpha_mb(); 220 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 0; 221 alpha_mb(); 222 } 223 224 /* XXX XXX BEGIN XXX XXX */ 225 { /* XXX */ 226 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 227 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 228 } /* XXX */ 229 /* XXX XXX END XXX XXX */ 230 } 231 232 /* 233 * Return the bus dma tag to be used for the specified bus type. 234 * INTERNAL USE ONLY! 235 */ 236 bus_dma_tag_t 237 dwlpx_dma_get_tag(t, bustype) 238 bus_dma_tag_t t; 239 alpha_bus_t bustype; 240 { 241 struct dwlpx_config *ccp = t->_cookie; 242 243 switch (bustype) { 244 case ALPHA_BUS_PCI: 245 case ALPHA_BUS_EISA: 246 /* 247 * XXX FIXME! 248 * XXX If the system has more than 1G of RAM, 249 * XXX we need to use SGMAPs, or some combination 250 * XXX of direct-mapped and SGMAP-mapped DMA. 251 */ 252 return (&ccp->cc_dmat_direct); 253 254 case ALPHA_BUS_ISA: 255 /* 256 * ISA doesn't have enough address bits to use 257 * the direct-mapped DMA window, so we must use 258 * SGMAPs. 259 */ 260 return (&ccp->cc_dmat_sgmap); 261 262 default: 263 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 264 } 265 } 266 267 /* 268 * Create a DWLPx SGMAP-mapped DMA map. 269 */ 270 int 271 dwlpx_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 272 flags, dmamp) 273 bus_dma_tag_t t; 274 bus_size_t size; 275 int nsegments; 276 bus_size_t maxsegsz; 277 bus_size_t boundary; 278 int flags; 279 bus_dmamap_t *dmamp; 280 { 281 struct dwlpx_config *ccp = t->_cookie; 282 struct alpha_sgmap_cookie *a; 283 bus_dmamap_t map; 284 int error; 285 286 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 287 boundary, flags, dmamp); 288 if (error) 289 return (error); 290 291 map = *dmamp; 292 293 a = malloc(sizeof(struct alpha_sgmap_cookie), M_DEVBUF, 294 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK); 295 if (a == NULL) { 296 _bus_dmamap_destroy(t, map); 297 return (ENOMEM); 298 } 299 bzero(a, sizeof(struct alpha_sgmap_cookie)); 300 map->_dm_sgcookie = a; 301 302 if (flags & BUS_DMA_ALLOCNOW) { 303 error = alpha_sgmap_alloc(map, round_page(size), 304 &ccp->cc_sgmap, flags); 305 if (error) 306 dwlpx_bus_dmamap_destroy_sgmap(t, map); 307 } 308 309 return (error); 310 } 311 312 /* 313 * Destroy a DWLPx SGMAP-mapped DMA map. 314 */ 315 void 316 dwlpx_bus_dmamap_destroy_sgmap(t, map) 317 bus_dma_tag_t t; 318 bus_dmamap_t map; 319 { 320 struct dwlpx_config *ccp = t->_cookie; 321 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 322 323 if (a->apdc_flags & APDC_HAS_SGMAP) 324 alpha_sgmap_free(&ccp->cc_sgmap, a); 325 326 free(a, M_DEVBUF); 327 _bus_dmamap_destroy(t, map); 328 } 329 330 /* 331 * Load a DWLPx direct-mapped DMA map with a linear buffer. 332 */ 333 int 334 dwlpx_bus_dmamap_load_direct(t, map, buf, buflen, p, flags) 335 bus_dma_tag_t t; 336 bus_dmamap_t map; 337 void *buf; 338 bus_size_t buflen; 339 struct proc *p; 340 int flags; 341 { 342 343 return (_bus_dmamap_load_direct_common(t, map, buf, buflen, p, 344 flags, DWLPx_DIRECT_MAPPED_BASE)); 345 } 346 347 /* 348 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 349 */ 350 int 351 dwlpx_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 352 bus_dma_tag_t t; 353 bus_dmamap_t map; 354 void *buf; 355 bus_size_t buflen; 356 struct proc *p; 357 int flags; 358 { 359 struct dwlpx_config *ccp = t->_cookie; 360 361 return (pci_pte32_sgmap_load(t, map, buf, buflen, p, flags, 362 &ccp->cc_sgmap)); 363 } 364 365 /* 366 * Load a DWLPx direct-mapped DMA map with an mbuf chain. 367 */ 368 int 369 dwlpx_bus_dmamap_load_mbuf_direct(t, map, m, flags) 370 bus_dma_tag_t t; 371 bus_dmamap_t map; 372 struct mbuf *m; 373 int flags; 374 { 375 376 return (_bus_dmamap_load_mbuf_direct_common(t, map, m, 377 flags, DWLPx_DIRECT_MAPPED_BASE)); 378 } 379 380 /* 381 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 382 */ 383 int 384 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 385 bus_dma_tag_t t; 386 bus_dmamap_t map; 387 struct mbuf *m; 388 int flags; 389 { 390 struct dwlpx_config *ccp = t->_cookie; 391 392 return (pci_pte32_sgmap_load_mbuf(t, map, m, flags, &ccp->cc_sgmap)); 393 } 394 395 /* 396 * Load a DWLPx direct-mapped DMA map with a uio. 397 */ 398 int 399 dwlpx_bus_dmamap_load_uio_direct(t, map, uio, flags) 400 bus_dma_tag_t t; 401 bus_dmamap_t map; 402 struct uio *uio; 403 int flags; 404 { 405 406 return (_bus_dmamap_load_uio_direct_common(t, map, uio, 407 flags, DWLPx_DIRECT_MAPPED_BASE)); 408 } 409 410 /* 411 * Load a DWLPx SGMAP-mapped DMA map with a uio. 412 */ 413 int 414 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 415 bus_dma_tag_t t; 416 bus_dmamap_t map; 417 struct uio *uio; 418 int flags; 419 { 420 struct dwlpx_config *ccp = t->_cookie; 421 422 return (pci_pte32_sgmap_load_uio(t, map, uio, flags, &ccp->cc_sgmap)); 423 } 424 425 /* 426 * Load a DWLPx direct-mapped DMA map with raw memory. 427 */ 428 int 429 dwlpx_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) 430 bus_dma_tag_t t; 431 bus_dmamap_t map; 432 bus_dma_segment_t *segs; 433 int nsegs; 434 bus_size_t size; 435 int flags; 436 { 437 438 return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, 439 size, flags, DWLPx_DIRECT_MAPPED_BASE)); 440 } 441 442 /* 443 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 444 */ 445 int 446 dwlpx_bus_dmamap_load_raw_sgmap(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 struct dwlpx_config *ccp = t->_cookie; 455 456 return (pci_pte32_sgmap_load_raw(t, map, segs, nsegs, size, flags, 457 &ccp->cc_sgmap)); 458 } 459 460 /* 461 * Unload a DWLPx DMA map. 462 */ 463 void 464 dwlpx_bus_dmamap_unload_sgmap(t, map) 465 bus_dma_tag_t t; 466 bus_dmamap_t map; 467 { 468 struct dwlpx_config *ccp = t->_cookie; 469 470 /* 471 * Invalidate any SGMAP page table entries used by this 472 * mapping. 473 */ 474 pci_pte32_sgmap_unload(t, map, &ccp->cc_sgmap); 475 476 /* 477 * Do the generic bits of the unload. 478 */ 479 _bus_dmamap_unload(t, map); 480 } 481
Indexes created Mon Oct 27 17:09:47 GMT 2025