mcpcia_dma.c revision 1.3
1 /* $NetBSD: mcpcia_dma.c,v 1.3 1998/05/13 21:21:17 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 1.3 1998/05/13 21:21:17 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->_wbase = MCPCIA_DIRECT_MAPPED_SIZE; 115 t->_next_window = NULL; /* XXX See above. */ 116 t->_sgmap = NULL; 117 t->_get_tag = mcpcia_dma_get_tag; 118 t->_dmamap_create = _bus_dmamap_create; 119 t->_dmamap_destroy = _bus_dmamap_destroy; 120 t->_dmamap_load = _bus_dmamap_load_direct; 121 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 122 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 123 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 124 t->_dmamap_unload = _bus_dmamap_unload; 125 t->_dmamap_sync = _bus_dmamap_sync; 126 127 t->_dmamem_alloc = _bus_dmamem_alloc; 128 t->_dmamem_free = _bus_dmamem_free; 129 t->_dmamem_map = _bus_dmamem_map; 130 t->_dmamem_unmap = _bus_dmamem_unmap; 131 t->_dmamem_mmap = _bus_dmamem_mmap; 132 133 /* 134 * Initialize the DMA tag used for sgmap-mapped ISA DMA. 135 */ 136 t = &ccp->cc_dmat_sgmap; 137 t->_cookie = ccp; 138 t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE; 139 t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE; 140 t->_next_window = NULL; 141 t->_sgmap = &ccp->cc_sgmap; 142 t->_get_tag = mcpcia_dma_get_tag; 143 t->_dmamap_create = mcpcia_bus_dmamap_create_sgmap; 144 t->_dmamap_destroy = mcpcia_bus_dmamap_destroy_sgmap; 145 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 146 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 147 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 148 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 149 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 150 t->_dmamap_sync = _bus_dmamap_sync; 151 152 t->_dmamem_alloc = _bus_dmamem_alloc; 153 t->_dmamem_free = _bus_dmamem_free; 154 t->_dmamem_map = _bus_dmamem_map; 155 t->_dmamem_unmap = _bus_dmamem_unmap; 156 t->_dmamem_mmap = _bus_dmamem_mmap; 157 158 /* 159 * The SRM console is supposed to set up an 8MB direct mapped window 160 * at 8MB (window 0) and a 1MB direct mapped window at 1MB. Useless. 161 * 162 * The DU && OpenVMS convention is to have an 8MB S/G window 163 * at 8MB for window 0, a 1GB direct mapped window at 2GB 164 * for window 1, a 1 GB S/G window at window 2 and a 512 MB 165 * S/G window at window 3. This seems overkill. 166 * 167 * We'll just go with the 8MB S/G window and one 1GB direct window. 168 * XXX See comment above. 169 */ 170 171 /* 172 * Initialize the SGMAP. 173 * 174 * Must align page table to its size. 175 */ 176 alpha_sgmap_init(t, &ccp->cc_sgmap, "mcpcia_sgmap", 177 MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE, 178 sizeof(u_int64_t), NULL, 0); 179 180 if (ccp->cc_sgmap.aps_ptpa & (1024-1)) { 181 panic("mcpcia_dma_init: bad page table address %x", 182 ccp->cc_sgmap.aps_ptpa); 183 } 184 185 /* 186 * Disable windows first. 187 */ 188 189 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 0; 190 REGVAL(MCPCIA_W1_BASE(ccp->cc_sc)) = 0; 191 REGVAL(MCPCIA_W2_BASE(ccp->cc_sc)) = 0; 192 REGVAL(MCPCIA_W3_BASE(ccp->cc_sc)) = 0; 193 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 194 REGVAL(MCPCIA_T1_BASE(ccp->cc_sc)) = 0; 195 REGVAL(MCPCIA_T2_BASE(ccp->cc_sc)) = 0; 196 REGVAL(MCPCIA_T3_BASE(ccp->cc_sc)) = 0; 197 alpha_mb(); 198 199 /* 200 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB. 201 */ 202 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_8M; 203 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 204 ccp->cc_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 205 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 206 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE; 207 alpha_mb(); 208 209 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 210 211 /* 212 * Set up window 1 as a 1 GB Direct-mapped window starting at 2GB. 213 */ 214 215 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_1G; 216 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 217 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 218 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN; 219 alpha_mb(); 220 221 /* XXX XXX BEGIN XXX XXX */ 222 { /* XXX */ 223 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 224 alpha_XXX_dmamap_or = MCPCIA_DIRECT_MAPPED_BASE;/* XXX */ 225 } /* XXX */ 226 /* XXX XXX END XXX XXX */ 227 } 228 229 /* 230 * Return the bus dma tag to be used for the specified bus type. 231 * INTERNAL USE ONLY! 232 */ 233 bus_dma_tag_t 234 mcpcia_dma_get_tag(t, bustype) 235 bus_dma_tag_t t; 236 alpha_bus_t bustype; 237 { 238 struct mcpcia_config *ccp = t->_cookie; 239 extern int physmem; 240 241 switch (bustype) { 242 case ALPHA_BUS_PCI: 243 case ALPHA_BUS_EISA: 244 /* 245 * Just always use direct-mapped for now; see comment 246 * above about chaining with SGMAPs. 247 */ 248 return (&ccp->cc_dmat_direct); 249 250 case ALPHA_BUS_ISA: 251 /* 252 * ISA doesn't have enough address bits to use 253 * the direct-mapped DMA window, so we must use 254 * SGMAPs. 255 */ 256 return (&ccp->cc_dmat_sgmap); 257 258 default: 259 panic("mcpcia_dma_get_tag: shouldn't be here, really..."); 260 } 261 } 262 263 /* 264 * Create a MCPCIA SGMAP-mapped DMA map. 265 */ 266 int 267 mcpcia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 268 flags, dmamp) 269 bus_dma_tag_t t; 270 bus_size_t size; 271 int nsegments; 272 bus_size_t maxsegsz; 273 bus_size_t boundary; 274 int flags; 275 bus_dmamap_t *dmamp; 276 { 277 bus_dmamap_t map; 278 int error; 279 280 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 281 boundary, flags, dmamp); 282 if (error) 283 return (error); 284 285 map = *dmamp; 286 287 if (flags & BUS_DMA_ALLOCNOW) { 288 error = alpha_sgmap_alloc(map, round_page(size), 289 t->_sgmap, flags); 290 if (error) 291 mcpcia_bus_dmamap_destroy_sgmap(t, map); 292 } 293 294 return (error); 295 } 296 297 /* 298 * Destroy a MCPCIA SGMAP-mapped DMA map. 299 */ 300 void 301 mcpcia_bus_dmamap_destroy_sgmap(t, map) 302 bus_dma_tag_t t; 303 bus_dmamap_t map; 304 { 305 306 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 307 alpha_sgmap_free(map, t->_sgmap); 308 309 _bus_dmamap_destroy(t, map); 310 } 311 312 /* 313 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer. 314 */ 315 int 316 mcpcia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 317 bus_dma_tag_t t; 318 bus_dmamap_t map; 319 void *buf; 320 bus_size_t buflen; 321 struct proc *p; 322 int flags; 323 { 324 int error; 325 struct mcpcia_config *ccp = t->_cookie; 326 327 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 328 t->_sgmap); 329 if (error == 0) 330 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 331 return (error); 332 } 333 334 /* 335 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain. 336 */ 337 int 338 mcpcia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 339 bus_dma_tag_t t; 340 bus_dmamap_t map; 341 struct mbuf *m; 342 int flags; 343 { 344 int error; 345 struct mcpcia_config *ccp = t->_cookie; 346 347 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 348 if (error == 0) 349 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 350 return (error); 351 } 352 353 /* 354 * Load a MCPCIA SGMAP-mapped DMA map with a uio. 355 */ 356 int 357 mcpcia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 358 bus_dma_tag_t t; 359 bus_dmamap_t map; 360 struct uio *uio; 361 int flags; 362 { 363 int error; 364 struct mcpcia_config *ccp = t->_cookie; 365 366 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 367 if (error == 0) 368 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 369 return (error); 370 } 371 372 /* 373 * Load a MCPCIA SGMAP-mapped DMA map with raw memory. 374 */ 375 int 376 mcpcia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 377 bus_dma_tag_t t; 378 bus_dmamap_t map; 379 bus_dma_segment_t *segs; 380 int nsegs; 381 bus_size_t size; 382 int flags; 383 { 384 int error; 385 struct mcpcia_config *ccp = t->_cookie; 386 387 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 388 t->_sgmap); 389 if (error == 0) 390 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 391 return (error); 392 } 393 394 /* 395 * Unload a MCPCIA DMA map. 396 */ 397 void 398 mcpcia_bus_dmamap_unload_sgmap(t, map) 399 bus_dma_tag_t t; 400 bus_dmamap_t map; 401 { 402 struct mcpcia_config *ccp = t->_cookie; 403 404 /* 405 * Invalidate any SGMAP page table entries used by this mapping. 406 */ 407 pci_sgmap_pte64_unload(t, map, t->_sgmap); 408 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 409 410 /* 411 * Do the generic bits of the unload. 412 */ 413 _bus_dmamap_unload(t, map); 414 } 415
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