dwlpx_dma.c revision 1.12.6.1
1 /* $NetBSD: dwlpx_dma.c,v 1.12.6.1 1999/04/07 08:12:40 pk Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 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: dwlpx_dma.c,v 1.12.6.1 1999/04/07 08:12:40 pk 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_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 71 bus_size_t, struct proc *, int)); 72 73 int dwlpx_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 74 struct mbuf *, int)); 75 76 int dwlpx_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 77 struct uio *, int)); 78 79 int dwlpx_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 80 bus_dma_segment_t *, int, bus_size_t, int)); 81 82 void dwlpx_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 83 84 /* 85 * Direct-mapped window: 2G at 2G 86 */ 87 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 88 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 89 90 /* 91 * SGMAP window A: 256M or 1G at 1G 92 */ 93 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) 94 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) 95 96 /* 97 * Set this to always use SGMAPs. 98 */ 99 #ifdef DWLPX_ALWAYS_USE_SGMAP 100 int dwlpx_always_use_sgmap = 1; 101 #else 102 int dwlpx_always_use_sgmap = 0; 103 #endif 104 105 void 106 dwlpx_dma_init(ccp) 107 struct dwlpx_config *ccp; 108 { 109 char *exname; 110 bus_dma_tag_t t; 111 u_int32_t *page_table; 112 int i, lim, wmask; 113 114 /* 115 * Determine size of Window C based on the amount of SGMAP 116 * page table SRAM available. 117 */ 118 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 119 lim = 128 * 1024; 120 wmask = PCIA_WMASK_1G; 121 } else { 122 lim = 32 * 1024; 123 wmask = PCIA_WMASK_256M; 124 } 125 126 /* 127 * Initialize the DMA tag used for direct-mapped DMA. Chain 128 * this window to the SGMAP window, because we might have 129 * a lot of memory in the machine. 130 */ 131 t = &ccp->cc_dmat_direct; 132 t->_cookie = ccp; 133 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 134 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 135 t->_next_window = &ccp->cc_dmat_sgmap; 136 t->_boundary = 0; 137 t->_sgmap = NULL; 138 t->_get_tag = dwlpx_dma_get_tag; 139 t->_dmamap_create = _bus_dmamap_create; 140 t->_dmamap_destroy = _bus_dmamap_destroy; 141 t->_dmamap_load = _bus_dmamap_load_direct; 142 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 143 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 144 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 145 t->_dmamap_unload = _bus_dmamap_unload; 146 t->_dmamap_sync = _bus_dmamap_sync; 147 148 t->_dmamem_alloc = _bus_dmamem_alloc; 149 t->_dmamem_free = _bus_dmamem_free; 150 t->_dmamem_map = _bus_dmamem_map; 151 t->_dmamem_unmap = _bus_dmamem_unmap; 152 t->_dmamem_mmap = _bus_dmamem_mmap; 153 154 /* 155 * Initialize the DMA tag used for sgmap-mapped DMA. 156 */ 157 t = &ccp->cc_dmat_sgmap; 158 t->_cookie = ccp; 159 t->_wbase = DWLPx_SG_MAPPED_BASE; 160 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 161 t->_next_window = NULL; 162 t->_boundary = 0; 163 t->_sgmap = &ccp->cc_sgmap; 164 t->_get_tag = dwlpx_dma_get_tag; 165 t->_dmamap_create = dwlpx_bus_dmamap_create_sgmap; 166 t->_dmamap_destroy = dwlpx_bus_dmamap_destroy_sgmap; 167 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 168 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 169 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 170 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 171 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 172 t->_dmamap_sync = _bus_dmamap_sync; 173 174 t->_dmamem_alloc = _bus_dmamem_alloc; 175 t->_dmamem_free = _bus_dmamem_free; 176 t->_dmamem_map = _bus_dmamem_map; 177 t->_dmamem_unmap = _bus_dmamem_unmap; 178 t->_dmamem_mmap = _bus_dmamem_mmap; 179 180 /* 181 * A few notes about SGMAP-mapped DMA on the DWLPx: 182 * 183 * The DWLPx has PCIA-resident SRAM that is used for 184 * the SGMAP page table; there is no TLB. The DWLPA 185 * has room for 32K entries, yielding a total of 256M 186 * of sgva space. The DWLPB has 32K entries or 128K 187 * entries, depending on TBIT, yielding either 256M or 188 * 1G of sgva space. 189 * 190 * This sgva space must be shared across all windows 191 * that wish to use SGMAP-mapped DMA; make sure to 192 * adjust the "sgvabase" argument to alpha_sgmap_init() 193 * accordingly if you create more than one SGMAP-mapped 194 * window. Note that sgvabase != window base. The former 195 * is used to compute indexes into the page table only. 196 * 197 * In the current implementation the first window is a 198 * 2G window direct-mapped mapped at 2G and the second 199 * window is disabled and the third window is a 256M 200 * or 1GB scatter/gather map at 1GB. 201 * 202 * We just punt on trying to support ISA DMA. If you want 203 * try that on a TurboLaser, well, you just lose. 204 */ 205 206 /* 207 * Initialize the page table. 208 */ 209 page_table = 210 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 211 for (i = 0; i < lim; i++) 212 page_table[i * SGMAP_PTE_SPACING] = 0; 213 alpha_mb(); 214 215 /* 216 * Initialize the SGMAP for window C: 217 * 218 * Size: 256M or 1GB 219 * Window base: 1GB 220 * SGVA base: 0 221 */ 222 exname = malloc(16, M_DEVBUF, M_NOWAIT); 223 if (exname == NULL) 224 panic("dwlpx_dma_init"); 225 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 226 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 227 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(u_int32_t), 228 (void *)page_table, 0); 229 230 /* 231 * Set up DMA windows for this DWLPx. 232 * 233 * Do this even for all HPCs- even for the nonexistent 234 * one on hose zero of a KFTIA. 235 */ 236 for (i = 0; i < NHPC; i++) { 237 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 238 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 239 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 240 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 241 242 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 243 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 244 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 245 246 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 247 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 248 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 249 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 250 alpha_mb(); 251 } 252 253 /* XXX XXX BEGIN XXX XXX */ 254 { /* XXX */ 255 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 256 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 257 } /* XXX */ 258 /* XXX XXX END XXX XXX */ 259 } 260 261 /* 262 * Return the bus dma tag to be used for the specified bus type. 263 * INTERNAL USE ONLY! 264 */ 265 bus_dma_tag_t 266 dwlpx_dma_get_tag(t, bustype) 267 bus_dma_tag_t t; 268 alpha_bus_t bustype; 269 { 270 struct dwlpx_config *ccp = t->_cookie; 271 272 switch (bustype) { 273 case ALPHA_BUS_PCI: 274 case ALPHA_BUS_EISA: 275 if (dwlpx_always_use_sgmap) { 276 /* 277 * Always use SGMAPs (for testing purposes?) 278 */ 279 return (&ccp->cc_dmat_sgmap); 280 } 281 /* 282 * Give these busses the direct-mapped window; if the 283 * address crosses the threshold, it will fall back 284 * onto the SGMAP window. 285 */ 286 return (&ccp->cc_dmat_direct); 287 288 case ALPHA_BUS_ISA: 289 /* 290 * Don't even bother; it's not easy, given how the 291 * page table is arranged, and it's not really worth 292 * the trouble. 293 */ 294 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 295 /* NOTREACHED */ 296 297 default: 298 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 299 } 300 } 301 302 /* 303 * Create a DWLPx SGMAP-mapped DMA map. 304 */ 305 int 306 dwlpx_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 307 flags, dmamp) 308 bus_dma_tag_t t; 309 bus_size_t size; 310 int nsegments; 311 bus_size_t maxsegsz; 312 bus_size_t boundary; 313 int flags; 314 bus_dmamap_t *dmamp; 315 { 316 bus_dmamap_t map; 317 int error; 318 319 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 320 boundary, flags, dmamp); 321 if (error) 322 return (error); 323 324 map = *dmamp; 325 326 if (flags & BUS_DMA_ALLOCNOW) { 327 error = alpha_sgmap_alloc(map, round_page(size), 328 t->_sgmap, flags); 329 if (error) 330 dwlpx_bus_dmamap_destroy_sgmap(t, map); 331 } 332 333 return (error); 334 } 335 336 /* 337 * Destroy a DWLPx SGMAP-mapped DMA map. 338 */ 339 void 340 dwlpx_bus_dmamap_destroy_sgmap(t, map) 341 bus_dma_tag_t t; 342 bus_dmamap_t map; 343 { 344 345 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 346 alpha_sgmap_free(map, t->_sgmap); 347 348 _bus_dmamap_destroy(t, map); 349 } 350 351 /* 352 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 353 */ 354 int 355 dwlpx_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 356 bus_dma_tag_t t; 357 bus_dmamap_t map; 358 void *buf; 359 bus_size_t buflen; 360 struct proc *p; 361 int flags; 362 { 363 364 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 365 t->_sgmap)); 366 } 367 368 /* 369 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 370 */ 371 int 372 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 373 bus_dma_tag_t t; 374 bus_dmamap_t map; 375 struct mbuf *m; 376 int flags; 377 { 378 379 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 380 } 381 382 /* 383 * Load a DWLPx SGMAP-mapped DMA map with a uio. 384 */ 385 int 386 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 387 bus_dma_tag_t t; 388 bus_dmamap_t map; 389 struct uio *uio; 390 int flags; 391 { 392 393 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 394 } 395 396 /* 397 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 398 */ 399 int 400 dwlpx_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 401 bus_dma_tag_t t; 402 bus_dmamap_t map; 403 bus_dma_segment_t *segs; 404 int nsegs; 405 bus_size_t size; 406 int flags; 407 { 408 409 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 410 t->_sgmap)); 411 } 412 413 /* 414 * Unload a DWLPx DMA map. 415 */ 416 void 417 dwlpx_bus_dmamap_unload_sgmap(t, map) 418 bus_dma_tag_t t; 419 bus_dmamap_t map; 420 { 421 422 /* 423 * Invalidate any SGMAP page table entries used by this 424 * mapping. 425 */ 426 pci_sgmap_pte32_unload(t, map, t->_sgmap); 427 428 /* 429 * Do the generic bits of the unload. 430 */ 431 _bus_dmamap_unload(t, map); 432 } 433
Indexes created Mon Oct 27 08:10:08 GMT 2025