mcpcia_dma.c revision 1.5
1 /* $NetBSD: mcpcia_dma.c,v 1.5 1998/06/03 18:25:54 thorpej 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. This code happens to have been written 10 * by Matthew Jacob for NASA/Ames. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPEMCPCIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 42 43 __KERNEL_RCSID(0, "$NetBSD: mcpcia_dma.c,v 1.5 1998/06/03 18:25:54 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/mcpciareg.h> 58 #include <alpha/pci/mcpciavar.h> 59 #include <alpha/pci/pci_kn300.h> 60 61 bus_dma_tag_t mcpcia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 62 63 int mcpcia_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, 64 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 65 66 void mcpcia_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 67 68 int mcpcia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 69 bus_size_t, struct proc *, int)); 70 71 int mcpcia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 72 struct mbuf *, int)); 73 74 int mcpcia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 75 struct uio *, int)); 76 77 int mcpcia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 78 bus_dma_segment_t *, int, bus_size_t, int)); 79 80 void mcpcia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 81 82 /* 83 * Direct-mapped window: 1G at 2G 84 * 85 * XXX Should consider making this 2G at 2G, and creating a 1G at 1G 86 * XXX SGMAP window for fallback if we have more than 2G of RAM. 87 */ 88 #define MCPCIA_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 89 #define MCPCIA_DIRECT_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL) 90 91 /* 92 * SGMAP window for ISA: 8M at 8M 93 */ 94 #define MCPCIA_ISA_SG_MAPPED_BASE (8*1024*1024) 95 #define MCPCIA_ISA_SG_MAPPED_SIZE (8*1024*1024) 96 97 #define MCPCIA_SGTLB_INVALIDATE(mcp) \ 98 alpha_mb(), \ 99 REGVAL(MCPCIA_SG_TBIA(mcp)) = 0xdeadbeef, \ 100 alpha_mb() 101 102 void 103 mcpcia_dma_init(ccp) 104 struct mcpcia_config *ccp; 105 { 106 bus_dma_tag_t t; 107 108 /* 109 * Initialize the DMA tag used for direct-mapped DMA. 110 */ 111 t = &ccp->cc_dmat_direct; 112 t->_cookie = ccp; 113 t->_wbase = MCPCIA_DIRECT_MAPPED_BASE; 114 t->_wsize = MCPCIA_DIRECT_MAPPED_SIZE; 115 t->_next_window = NULL; /* XXX See above. */ 116 t->_boundary = 0; 117 t->_sgmap = NULL; 118 t->_get_tag = mcpcia_dma_get_tag; 119 t->_dmamap_create = _bus_dmamap_create; 120 t->_dmamap_destroy = _bus_dmamap_destroy; 121 t->_dmamap_load = _bus_dmamap_load_direct; 122 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 123 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 124 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 125 t->_dmamap_unload = _bus_dmamap_unload; 126 t->_dmamap_sync = _bus_dmamap_sync; 127 128 t->_dmamem_alloc = _bus_dmamem_alloc; 129 t->_dmamem_free = _bus_dmamem_free; 130 t->_dmamem_map = _bus_dmamem_map; 131 t->_dmamem_unmap = _bus_dmamem_unmap; 132 t->_dmamem_mmap = _bus_dmamem_mmap; 133 134 /* 135 * Initialize the DMA tag used for sgmap-mapped ISA DMA. 136 */ 137 t = &ccp->cc_dmat_sgmap; 138 t->_cookie = ccp; 139 t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE; 140 t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE; 141 t->_next_window = NULL; 142 t->_boundary = 0; 143 t->_sgmap = &ccp->cc_sgmap; 144 t->_get_tag = mcpcia_dma_get_tag; 145 t->_dmamap_create = mcpcia_bus_dmamap_create_sgmap; 146 t->_dmamap_destroy = mcpcia_bus_dmamap_destroy_sgmap; 147 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 148 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 149 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 150 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 151 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 152 t->_dmamap_sync = _bus_dmamap_sync; 153 154 t->_dmamem_alloc = _bus_dmamem_alloc; 155 t->_dmamem_free = _bus_dmamem_free; 156 t->_dmamem_map = _bus_dmamem_map; 157 t->_dmamem_unmap = _bus_dmamem_unmap; 158 t->_dmamem_mmap = _bus_dmamem_mmap; 159 160 /* 161 * The SRM console is supposed to set up an 8MB direct mapped window 162 * at 8MB (window 0) and a 1MB direct mapped window at 1MB. Useless. 163 * 164 * The DU && OpenVMS convention is to have an 8MB S/G window 165 * at 8MB for window 0, a 1GB direct mapped window at 2GB 166 * for window 1, a 1 GB S/G window at window 2 and a 512 MB 167 * S/G window at window 3. This seems overkill. 168 * 169 * We'll just go with the 8MB S/G window and one 1GB direct window. 170 * XXX See comment above. 171 */ 172 173 /* 174 * Initialize the SGMAP. 175 * 176 * Must align page table to its size. 177 */ 178 alpha_sgmap_init(t, &ccp->cc_sgmap, "mcpcia_sgmap", 179 MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE, 180 sizeof(u_int64_t), NULL, 0); 181 182 if (ccp->cc_sgmap.aps_ptpa & (1024-1)) { 183 panic("mcpcia_dma_init: bad page table address %x", 184 ccp->cc_sgmap.aps_ptpa); 185 } 186 187 /* 188 * Disable windows first. 189 */ 190 191 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 0; 192 REGVAL(MCPCIA_W1_BASE(ccp->cc_sc)) = 0; 193 REGVAL(MCPCIA_W2_BASE(ccp->cc_sc)) = 0; 194 REGVAL(MCPCIA_W3_BASE(ccp->cc_sc)) = 0; 195 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 196 REGVAL(MCPCIA_T1_BASE(ccp->cc_sc)) = 0; 197 REGVAL(MCPCIA_T2_BASE(ccp->cc_sc)) = 0; 198 REGVAL(MCPCIA_T3_BASE(ccp->cc_sc)) = 0; 199 alpha_mb(); 200 201 /* 202 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB. 203 */ 204 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_8M; 205 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 206 ccp->cc_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 207 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 208 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE; 209 alpha_mb(); 210 211 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 212 213 /* 214 * Set up window 1 as a 1 GB Direct-mapped window starting at 2GB. 215 */ 216 217 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_1G; 218 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 219 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 220 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN; 221 alpha_mb(); 222 223 /* XXX XXX BEGIN XXX XXX */ 224 { /* XXX */ 225 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 226 alpha_XXX_dmamap_or = MCPCIA_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 mcpcia_dma_get_tag(t, bustype) 237 bus_dma_tag_t t; 238 alpha_bus_t bustype; 239 { 240 struct mcpcia_config *ccp = t->_cookie; 241 extern int physmem; 242 243 switch (bustype) { 244 case ALPHA_BUS_PCI: 245 case ALPHA_BUS_EISA: 246 /* 247 * Just always use direct-mapped for now; see comment 248 * above about chaining with SGMAPs. 249 */ 250 return (&ccp->cc_dmat_direct); 251 252 case ALPHA_BUS_ISA: 253 /* 254 * ISA doesn't have enough address bits to use 255 * the direct-mapped DMA window, so we must use 256 * SGMAPs. 257 */ 258 return (&ccp->cc_dmat_sgmap); 259 260 default: 261 panic("mcpcia_dma_get_tag: shouldn't be here, really..."); 262 } 263 } 264 265 /* 266 * Create a MCPCIA SGMAP-mapped DMA map. 267 */ 268 int 269 mcpcia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 270 flags, dmamp) 271 bus_dma_tag_t t; 272 bus_size_t size; 273 int nsegments; 274 bus_size_t maxsegsz; 275 bus_size_t boundary; 276 int flags; 277 bus_dmamap_t *dmamp; 278 { 279 bus_dmamap_t map; 280 int error; 281 282 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 283 boundary, flags, dmamp); 284 if (error) 285 return (error); 286 287 map = *dmamp; 288 289 if (flags & BUS_DMA_ALLOCNOW) { 290 error = alpha_sgmap_alloc(map, round_page(size), 291 t->_sgmap, flags); 292 if (error) 293 mcpcia_bus_dmamap_destroy_sgmap(t, map); 294 } 295 296 return (error); 297 } 298 299 /* 300 * Destroy a MCPCIA SGMAP-mapped DMA map. 301 */ 302 void 303 mcpcia_bus_dmamap_destroy_sgmap(t, map) 304 bus_dma_tag_t t; 305 bus_dmamap_t map; 306 { 307 308 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 309 alpha_sgmap_free(map, t->_sgmap); 310 311 _bus_dmamap_destroy(t, map); 312 } 313 314 /* 315 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer. 316 */ 317 int 318 mcpcia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 319 bus_dma_tag_t t; 320 bus_dmamap_t map; 321 void *buf; 322 bus_size_t buflen; 323 struct proc *p; 324 int flags; 325 { 326 int error; 327 struct mcpcia_config *ccp = t->_cookie; 328 329 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 330 t->_sgmap); 331 if (error == 0) 332 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 333 return (error); 334 } 335 336 /* 337 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain. 338 */ 339 int 340 mcpcia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 341 bus_dma_tag_t t; 342 bus_dmamap_t map; 343 struct mbuf *m; 344 int flags; 345 { 346 int error; 347 struct mcpcia_config *ccp = t->_cookie; 348 349 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 350 if (error == 0) 351 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 352 return (error); 353 } 354 355 /* 356 * Load a MCPCIA SGMAP-mapped DMA map with a uio. 357 */ 358 int 359 mcpcia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 360 bus_dma_tag_t t; 361 bus_dmamap_t map; 362 struct uio *uio; 363 int flags; 364 { 365 int error; 366 struct mcpcia_config *ccp = t->_cookie; 367 368 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 369 if (error == 0) 370 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 371 return (error); 372 } 373 374 /* 375 * Load a MCPCIA SGMAP-mapped DMA map with raw memory. 376 */ 377 int 378 mcpcia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 379 bus_dma_tag_t t; 380 bus_dmamap_t map; 381 bus_dma_segment_t *segs; 382 int nsegs; 383 bus_size_t size; 384 int flags; 385 { 386 int error; 387 struct mcpcia_config *ccp = t->_cookie; 388 389 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 390 t->_sgmap); 391 if (error == 0) 392 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 393 return (error); 394 } 395 396 /* 397 * Unload a MCPCIA DMA map. 398 */ 399 void 400 mcpcia_bus_dmamap_unload_sgmap(t, map) 401 bus_dma_tag_t t; 402 bus_dmamap_t map; 403 { 404 struct mcpcia_config *ccp = t->_cookie; 405 406 /* 407 * Invalidate any SGMAP page table entries used by this mapping. 408 */ 409 pci_sgmap_pte64_unload(t, map, t->_sgmap); 410 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 411 412 /* 413 * Do the generic bits of the unload. 414 */ 415 _bus_dmamap_unload(t, map); 416 } 417
Indexes created Mon Sep 29 21:09:56 GMT 2025