mcpcia_dma.c revision 1.2
1 /* $NetBSD: mcpcia_dma.c,v 1.2 1998/05/07 20:09:38 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 1.2 1998/05/07 20:09:38 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 #define MCPCIA_DIRECT_MAPPED_BASE 0x80000000 83 #define MCPCIA_SG_MAPPED_BASE (8 << 20) 84 85 #define MCPCIA_SGTLB_INVALIDATE(mcp) \ 86 alpha_mb(), \ 87 REGVAL(MCPCIA_SG_TBIA(mcp)) = 0xdeadbeef, \ 88 alpha_mb() 89 90 void 91 mcpcia_dma_init(ccp) 92 struct mcpcia_config *ccp; 93 { 94 bus_dma_tag_t t; 95 96 /* 97 * Initialize the DMA tag used for direct-mapped DMA. 98 */ 99 t = &ccp->cc_dmat_direct; 100 t->_cookie = ccp; 101 t->_wbase = MCPCIA_DIRECT_MAPPED_BASE; 102 t->_get_tag = mcpcia_dma_get_tag; 103 t->_dmamap_create = _bus_dmamap_create; 104 t->_dmamap_destroy = _bus_dmamap_destroy; 105 t->_dmamap_load = _bus_dmamap_load_direct; 106 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 107 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 108 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 109 t->_dmamap_unload = _bus_dmamap_unload; 110 t->_dmamap_sync = _bus_dmamap_sync; 111 112 t->_dmamem_alloc = _bus_dmamem_alloc; 113 t->_dmamem_free = _bus_dmamem_free; 114 t->_dmamem_map = _bus_dmamem_map; 115 t->_dmamem_unmap = _bus_dmamem_unmap; 116 t->_dmamem_mmap = _bus_dmamem_mmap; 117 118 /* 119 * Initialize the DMA tag used for sgmap-mapped DMA. 120 */ 121 t = &ccp->cc_dmat_sgmap; 122 t->_cookie = ccp; 123 t->_wbase = MCPCIA_SG_MAPPED_BASE; 124 t->_get_tag = mcpcia_dma_get_tag; 125 t->_dmamap_create = mcpcia_bus_dmamap_create_sgmap; 126 t->_dmamap_destroy = mcpcia_bus_dmamap_destroy_sgmap; 127 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 128 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 129 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 130 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 131 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 132 t->_dmamap_sync = _bus_dmamap_sync; 133 134 t->_dmamem_alloc = _bus_dmamem_alloc; 135 t->_dmamem_free = _bus_dmamem_free; 136 t->_dmamem_map = _bus_dmamem_map; 137 t->_dmamem_unmap = _bus_dmamem_unmap; 138 t->_dmamem_mmap = _bus_dmamem_mmap; 139 140 /* 141 * The SRM console is supposed to set up an 8MB direct mapped window 142 * at 8MB (window 0) and a 1MB direct mapped window at 1MB. Useless. 143 * 144 * The DU && OpenVMS convention is to have an 8MB S/G window 145 * at 8MB for window 0, a 1GB direct mapped window at 2GB 146 * for window 1, a 1 GB S/G window at window 2 and a 512 MB 147 * S/G window at window 3. This seems overkill. 148 * 149 * We'll just go with the 8MB S/G window and one 1GB direct window. 150 */ 151 152 /* 153 * Initialize the SGMAP. 154 * 155 * Must align page table to its size. 156 */ 157 alpha_sgmap_init(t, &ccp->cc_sgmap, "mcpcia_sgmap", 158 MCPCIA_SG_MAPPED_BASE, 0, (8 << 20), 159 sizeof(u_int64_t), NULL, 8 << 10); 160 161 if (ccp->cc_sgmap.aps_ptpa & (1024-1)) { 162 panic("mcpcia_dma_init: bad page table address %x", 163 ccp->cc_sgmap.aps_ptpa); 164 } 165 166 /* 167 * Disable windows first. 168 */ 169 170 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 0; 171 REGVAL(MCPCIA_W1_BASE(ccp->cc_sc)) = 0; 172 REGVAL(MCPCIA_W2_BASE(ccp->cc_sc)) = 0; 173 REGVAL(MCPCIA_W3_BASE(ccp->cc_sc)) = 0; 174 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 175 REGVAL(MCPCIA_T1_BASE(ccp->cc_sc)) = 0; 176 REGVAL(MCPCIA_T2_BASE(ccp->cc_sc)) = 0; 177 REGVAL(MCPCIA_T3_BASE(ccp->cc_sc)) = 0; 178 alpha_mb(); 179 180 /* 181 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB. 182 */ 183 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_8M; 184 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 185 ccp->cc_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 186 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 187 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_SG_MAPPED_BASE; 188 alpha_mb(); 189 190 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 191 192 /* 193 * Set up window 1 as a 1 GB Direct-mapped window starting at 2GB. 194 */ 195 196 REGVAL(MCPCIA_W0_MASK(ccp->cc_sc)) = MCPCIA_WMASK_1G; 197 REGVAL(MCPCIA_T0_BASE(ccp->cc_sc)) = 0; 198 REGVAL(MCPCIA_W0_BASE(ccp->cc_sc)) = 199 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN; 200 alpha_mb(); 201 202 /* XXX XXX BEGIN XXX XXX */ 203 { /* XXX */ 204 extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ 205 alpha_XXX_dmamap_or = MCPCIA_DIRECT_MAPPED_BASE;/* XXX */ 206 } /* XXX */ 207 /* XXX XXX END XXX XXX */ 208 } 209 210 /* 211 * Return the bus dma tag to be used for the specified bus type. 212 * INTERNAL USE ONLY! 213 */ 214 bus_dma_tag_t 215 mcpcia_dma_get_tag(t, bustype) 216 bus_dma_tag_t t; 217 alpha_bus_t bustype; 218 { 219 struct mcpcia_config *ccp = t->_cookie; 220 extern int physmem; 221 222 switch (bustype) { 223 case ALPHA_BUS_PCI: 224 case ALPHA_BUS_EISA: 225 /* 226 * As best as I can tell from the DU source, you can't 227 * do DIRECT MAPPED and S/G at the same time. 228 */ 229 return (&ccp->cc_dmat_direct); 230 231 case ALPHA_BUS_ISA: 232 /* 233 * ISA doesn't have enough address bits to use 234 * the direct-mapped DMA window, so we must use 235 * SGMAPs. 236 */ 237 return (&ccp->cc_dmat_sgmap); 238 239 default: 240 panic("mcpcia_dma_get_tag: shouldn't be here, really..."); 241 } 242 } 243 244 /* 245 * Create a MCPCIA SGMAP-mapped DMA map. 246 */ 247 int 248 mcpcia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, 249 flags, dmamp) 250 bus_dma_tag_t t; 251 bus_size_t size; 252 int nsegments; 253 bus_size_t maxsegsz; 254 bus_size_t boundary; 255 int flags; 256 bus_dmamap_t *dmamp; 257 { 258 struct mcpcia_config *ccp = t->_cookie; 259 bus_dmamap_t map; 260 int error; 261 262 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 263 boundary, flags, dmamp); 264 if (error) 265 return (error); 266 267 map = *dmamp; 268 269 if (flags & BUS_DMA_ALLOCNOW) { 270 error = alpha_sgmap_alloc(map, round_page(size), 271 &ccp->cc_sgmap, flags); 272 if (error) 273 mcpcia_bus_dmamap_destroy_sgmap(t, map); 274 } 275 276 return (error); 277 } 278 279 /* 280 * Destroy a MCPCIA SGMAP-mapped DMA map. 281 */ 282 void 283 mcpcia_bus_dmamap_destroy_sgmap(t, map) 284 bus_dma_tag_t t; 285 bus_dmamap_t map; 286 { 287 struct mcpcia_config *ccp = t->_cookie; 288 289 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 290 alpha_sgmap_free(map, &ccp->cc_sgmap); 291 292 _bus_dmamap_destroy(t, map); 293 } 294 295 /* 296 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer. 297 */ 298 int 299 mcpcia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 300 bus_dma_tag_t t; 301 bus_dmamap_t map; 302 void *buf; 303 bus_size_t buflen; 304 struct proc *p; 305 int flags; 306 { 307 int error; 308 struct mcpcia_config *ccp = t->_cookie; 309 310 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, 311 flags, &ccp->cc_sgmap); 312 if (error == 0) 313 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 314 return (error); 315 } 316 317 /* 318 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain. 319 */ 320 int 321 mcpcia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 322 bus_dma_tag_t t; 323 bus_dmamap_t map; 324 struct mbuf *m; 325 int flags; 326 { 327 int error; 328 struct mcpcia_config *ccp = t->_cookie; 329 330 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, &ccp->cc_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 a uio. 338 */ 339 int 340 mcpcia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 341 bus_dma_tag_t t; 342 bus_dmamap_t map; 343 struct uio *uio; 344 int flags; 345 { 346 int error; 347 struct mcpcia_config *ccp = t->_cookie; 348 349 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, &ccp->cc_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 raw memory. 357 */ 358 int 359 mcpcia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 360 bus_dma_tag_t t; 361 bus_dmamap_t map; 362 bus_dma_segment_t *segs; 363 int nsegs; 364 bus_size_t size; 365 int flags; 366 { 367 int error; 368 struct mcpcia_config *ccp = t->_cookie; 369 370 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, 371 size, flags, &ccp->cc_sgmap); 372 if (error == 0) 373 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 374 return (error); 375 } 376 377 /* 378 * Unload a MCPCIA DMA map. 379 */ 380 void 381 mcpcia_bus_dmamap_unload_sgmap(t, map) 382 bus_dma_tag_t t; 383 bus_dmamap_t map; 384 { 385 struct mcpcia_config *ccp = t->_cookie; 386 387 /* 388 * Invalidate any SGMAP page table entries used by this mapping. 389 */ 390 pci_sgmap_pte64_unload(t, map, &ccp->cc_sgmap); 391 MCPCIA_SGTLB_INVALIDATE(ccp->cc_sc); 392 393 /* 394 * Do the generic bits of the unload. 395 */ 396 _bus_dmamap_unload(t, map); 397 } 398
Indexes created Mon Sep 29 21:09:56 GMT 2025