cia_dma.c revision 1.18
1 /* $NetBSD: cia_dma.c,v 1.18 2001/07/19 18:42:42 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. 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: cia_dma.c,v 1.18 2001/07/19 18:42:42 thorpej 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 50 #include <uvm/uvm_extern.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/ciareg.h> 58 #include <alpha/pci/ciavar.h> 59 60 bus_dma_tag_t cia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 61 62 int cia_bus_dmamap_create_direct __P((bus_dma_tag_t, bus_size_t, int, 63 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 64 65 int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 66 bus_size_t, struct proc *, int)); 67 68 int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 69 struct mbuf *, int)); 70 71 int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 72 struct uio *, int)); 73 74 int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 75 bus_dma_segment_t *, int, bus_size_t, int)); 76 77 void cia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 78 79 /* 80 * Direct-mapped window: 1G at 1G 81 */ 82 #define CIA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 83 #define CIA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 84 85 /* 86 * SGMAP window: 8M at 8M 87 */ 88 #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) 89 #define CIA_SGMAP_MAPPED_SIZE (8*1024*1024) 90 91 /* ALCOR/ALGOR2/PYXIS have a 256-byte out-bound DMA prefetch threshold. */ 92 #define CIA_SGMAP_PFTHRESH 256 93 94 void cia_tlb_invalidate __P((void)); 95 void cia_broken_pyxis_tlb_invalidate __P((void)); 96 97 void (*cia_tlb_invalidate_fn) __P((void)); 98 99 #define CIA_TLB_INVALIDATE() (*cia_tlb_invalidate_fn)() 100 101 struct alpha_sgmap cia_pyxis_bug_sgmap; 102 #define CIA_PYXIS_BUG_BASE (128*1024*1024) 103 #define CIA_PYXIS_BUG_SIZE (2*1024*1024) 104 105 void 106 cia_dma_init(ccp) 107 struct cia_config *ccp; 108 { 109 bus_addr_t tbase; 110 bus_dma_tag_t t; 111 112 /* 113 * Initialize the DMA tag used for direct-mapped DMA. 114 */ 115 t = &ccp->cc_dmat_direct; 116 t->_cookie = ccp; 117 t->_wbase = CIA_DIRECT_MAPPED_BASE; 118 t->_wsize = CIA_DIRECT_MAPPED_SIZE; 119 t->_next_window = NULL; 120 t->_boundary = 0; 121 t->_sgmap = NULL; 122 t->_get_tag = cia_dma_get_tag; 123 t->_dmamap_create = cia_bus_dmamap_create_direct; 124 t->_dmamap_destroy = _bus_dmamap_destroy; 125 t->_dmamap_load = _bus_dmamap_load_direct; 126 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 127 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 128 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 129 t->_dmamap_unload = _bus_dmamap_unload; 130 t->_dmamap_sync = _bus_dmamap_sync; 131 132 t->_dmamem_alloc = _bus_dmamem_alloc; 133 t->_dmamem_free = _bus_dmamem_free; 134 t->_dmamem_map = _bus_dmamem_map; 135 t->_dmamem_unmap = _bus_dmamem_unmap; 136 t->_dmamem_mmap = _bus_dmamem_mmap; 137 138 /* 139 * Initialize the DMA tag used for sgmap-mapped DMA. 140 */ 141 t = &ccp->cc_dmat_sgmap; 142 t->_cookie = ccp; 143 t->_wbase = CIA_SGMAP_MAPPED_BASE; 144 t->_wsize = CIA_SGMAP_MAPPED_SIZE; 145 t->_next_window = NULL; 146 t->_boundary = 0; 147 t->_sgmap = &ccp->cc_sgmap; 148 t->_pfthresh = CIA_SGMAP_PFTHRESH; 149 t->_get_tag = cia_dma_get_tag; 150 t->_dmamap_create = alpha_sgmap_dmamap_create; 151 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 152 t->_dmamap_load = cia_bus_dmamap_load_sgmap; 153 t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap; 154 t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap; 155 t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap; 156 t->_dmamap_unload = cia_bus_dmamap_unload_sgmap; 157 t->_dmamap_sync = _bus_dmamap_sync; 158 159 t->_dmamem_alloc = _bus_dmamem_alloc; 160 t->_dmamem_free = _bus_dmamem_free; 161 t->_dmamem_map = _bus_dmamem_map; 162 t->_dmamem_unmap = _bus_dmamem_unmap; 163 t->_dmamem_mmap = _bus_dmamem_mmap; 164 165 /* 166 * The firmware has set up window 1 as a 1G direct-mapped DMA 167 * window beginning at 1G. We leave it alone. Leave window 168 * 0 alone until we reconfigure it for SGMAP-mapped DMA. 169 * Windows 2 and 3 are already disabled. 170 */ 171 172 /* 173 * Initialize the SGMAP. Must align page table to 32k 174 * (hardware bug?). 175 */ 176 alpha_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap", 177 CIA_SGMAP_MAPPED_BASE, 0, CIA_SGMAP_MAPPED_SIZE, 178 sizeof(u_int64_t), NULL, (32*1024)); 179 180 /* 181 * Set up window 0 as an 8MB SGMAP-mapped window 182 * starting at 8MB. 183 */ 184 REGVAL(CIA_PCI_W0BASE) = CIA_SGMAP_MAPPED_BASE | 185 CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN; 186 alpha_mb(); 187 188 REGVAL(CIA_PCI_W0MASK) = CIA_PCI_WnMASK_8M; 189 alpha_mb(); 190 191 tbase = ccp->cc_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT; 192 if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) 193 panic("cia_dma_init: bad page table address"); 194 REGVAL(CIA_PCI_T0BASE) = tbase; 195 alpha_mb(); 196 197 /* 198 * Pass 1 and 2 (i.e. revision <= 1) of the Pyxis have a 199 * broken scatter/gather TLB; it cannot be invalidated. To 200 * work around this problem, we configure window 2 as an SG 201 * 2M window at 128M, which we use in DMA loopback mode to 202 * read a spill page. This works by causing TLB misses, 203 * causing the old entries to be purged to make room for 204 * the new entries coming in for the spill page. 205 */ 206 if ((ccp->cc_flags & CCF_ISPYXIS) != 0 && ccp->cc_rev <= 1) { 207 u_int64_t *page_table; 208 int i; 209 210 cia_tlb_invalidate_fn = 211 cia_broken_pyxis_tlb_invalidate; 212 213 alpha_sgmap_init(t, &cia_pyxis_bug_sgmap, 214 "pyxis_bug_sgmap", CIA_PYXIS_BUG_BASE, 0, 215 CIA_PYXIS_BUG_SIZE, sizeof(u_int64_t), NULL, 216 (32*1024)); 217 218 REGVAL(CIA_PCI_W2BASE) = CIA_PYXIS_BUG_BASE | 219 CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN; 220 alpha_mb(); 221 222 REGVAL(CIA_PCI_W2MASK) = CIA_PCI_WnMASK_2M; 223 alpha_mb(); 224 225 tbase = cia_pyxis_bug_sgmap.aps_ptpa >> 226 CIA_PCI_TnBASE_SHIFT; 227 if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) 228 panic("cia_dma_init: bad page table address"); 229 REGVAL(CIA_PCI_T2BASE) = tbase; 230 alpha_mb(); 231 232 /* 233 * Initialize the page table to point at the spill 234 * page. Leave the last entry invalid. 235 */ 236 pci_sgmap_pte64_init_spill_page_pte(); 237 for (i = 0, page_table = cia_pyxis_bug_sgmap.aps_pt; 238 i < (CIA_PYXIS_BUG_SIZE / PAGE_SIZE) - 1; i++) { 239 page_table[i] = 240 pci_sgmap_pte64_prefetch_spill_page_pte; 241 } 242 alpha_mb(); 243 } else 244 cia_tlb_invalidate_fn = cia_tlb_invalidate; 245 246 CIA_TLB_INVALIDATE(); 247 248 /* XXX XXX BEGIN XXX XXX */ 249 { /* XXX */ 250 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 251 alpha_XXX_dmamap_or = CIA_DIRECT_MAPPED_BASE; /* XXX */ 252 } /* XXX */ 253 /* XXX XXX END XXX XXX */ 254 } 255 256 /* 257 * Return the bus dma tag to be used for the specified bus type. 258 * INTERNAL USE ONLY! 259 */ 260 bus_dma_tag_t 261 cia_dma_get_tag(t, bustype) 262 bus_dma_tag_t t; 263 alpha_bus_t bustype; 264 { 265 struct cia_config *ccp = t->_cookie; 266 267 switch (bustype) { 268 case ALPHA_BUS_PCI: 269 case ALPHA_BUS_EISA: 270 /* 271 * Systems with a CIA can only support 1G 272 * of memory, so we use the direct-mapped window 273 * on busses that have 32-bit DMA. 274 */ 275 return (&ccp->cc_dmat_direct); 276 277 case ALPHA_BUS_ISA: 278 /* 279 * ISA doesn't have enough address bits to use 280 * the direct-mapped DMA window, so we must use 281 * SGMAPs. 282 */ 283 return (&ccp->cc_dmat_sgmap); 284 285 default: 286 panic("cia_dma_get_tag: shouldn't be here, really..."); 287 } 288 } 289 290 /* 291 * Create a CIA direct-mapped DMA map. 292 */ 293 int 294 cia_bus_dmamap_create_direct(t, size, nsegments, maxsegsz, boundary, 295 flags, dmamp) 296 bus_dma_tag_t t; 297 bus_size_t size; 298 int nsegments; 299 bus_size_t maxsegsz; 300 bus_size_t boundary; 301 int flags; 302 bus_dmamap_t *dmamp; 303 { 304 struct cia_config *ccp = t->_cookie; 305 bus_dmamap_t map; 306 int error; 307 308 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 309 boundary, flags, dmamp); 310 if (error) 311 return (error); 312 313 map = *dmamp; 314 315 if ((ccp->cc_flags & CCF_PYXISBUG) != 0 && 316 map->_dm_segcnt > 1) { 317 /* 318 * We have a Pyxis with the DMA page crossing bug, make 319 * sure we don't coalesce adjacent DMA segments. 320 * 321 * NOTE: We can only do this if the max segment count 322 * is greater than 1. This is because many network 323 * drivers allocate large contiguous blocks of memory 324 * for control data structures, even though they won't 325 * do any single DMA that crosses a page coundary. 326 * -- thorpej (at) netbsd.org, 2/5/2000 327 */ 328 map->_dm_flags |= DMAMAP_NO_COALESCE; 329 } 330 331 return (0); 332 } 333 334 /* 335 * Load a CIA SGMAP-mapped DMA map with a linear buffer. 336 */ 337 int 338 cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 339 bus_dma_tag_t t; 340 bus_dmamap_t map; 341 void *buf; 342 bus_size_t buflen; 343 struct proc *p; 344 int flags; 345 { 346 int error; 347 348 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 349 t->_sgmap); 350 if (error == 0) 351 CIA_TLB_INVALIDATE(); 352 353 return (error); 354 } 355 356 /* 357 * Load a CIA SGMAP-mapped DMA map with an mbuf chain. 358 */ 359 int 360 cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 361 bus_dma_tag_t t; 362 bus_dmamap_t map; 363 struct mbuf *m; 364 int flags; 365 { 366 int error; 367 368 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 369 if (error == 0) 370 CIA_TLB_INVALIDATE(); 371 372 return (error); 373 } 374 375 /* 376 * Load a CIA SGMAP-mapped DMA map with a uio. 377 */ 378 int 379 cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 380 bus_dma_tag_t t; 381 bus_dmamap_t map; 382 struct uio *uio; 383 int flags; 384 { 385 int error; 386 387 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 388 if (error == 0) 389 CIA_TLB_INVALIDATE(); 390 391 return (error); 392 } 393 394 /* 395 * Load a CIA SGMAP-mapped DMA map with raw memory. 396 */ 397 int 398 cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 399 bus_dma_tag_t t; 400 bus_dmamap_t map; 401 bus_dma_segment_t *segs; 402 int nsegs; 403 bus_size_t size; 404 int flags; 405 { 406 int error; 407 408 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 409 t->_sgmap); 410 if (error == 0) 411 CIA_TLB_INVALIDATE(); 412 413 return (error); 414 } 415 416 /* 417 * Unload a CIA DMA map. 418 */ 419 void 420 cia_bus_dmamap_unload_sgmap(t, map) 421 bus_dma_tag_t t; 422 bus_dmamap_t map; 423 { 424 425 /* 426 * Invalidate any SGMAP page table entries used by this 427 * mapping. 428 */ 429 pci_sgmap_pte64_unload(t, map, t->_sgmap); 430 CIA_TLB_INVALIDATE(); 431 432 /* 433 * Do the generic bits of the unload. 434 */ 435 _bus_dmamap_unload(t, map); 436 } 437 438 /* 439 * Flush the CIA scatter/gather TLB. 440 */ 441 void 442 cia_tlb_invalidate() 443 { 444 445 alpha_mb(); 446 REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; 447 alpha_mb(); 448 } 449 450 /* 451 * Flush the scatter/gather TLB on broken Pyxis chips. 452 */ 453 void 454 cia_broken_pyxis_tlb_invalidate() 455 { 456 volatile u_int64_t dummy; 457 u_int32_t ctrl; 458 int i, s; 459 460 s = splhigh(); 461 462 /* 463 * Put the Pyxis into PCI loopback mode. 464 */ 465 alpha_mb(); 466 ctrl = REGVAL(CIA_CSR_CTRL); 467 REGVAL(CIA_CSR_CTRL) = ctrl | CTRL_PCI_LOOP_EN; 468 alpha_mb(); 469 470 /* 471 * Now, read from PCI dense memory space at offset 128M (our 472 * target window base), skipping 64k on each read. This forces 473 * S/G TLB misses. 474 * 475 * XXX Looks like the TLB entries are `not quite LRU'. We need 476 * XXX to read more times than there are actual tags! 477 */ 478 for (i = 0; i < CIA_TLB_NTAGS + 4; i++) { 479 dummy = *((volatile u_int64_t *) 480 ALPHA_PHYS_TO_K0SEG(CIA_PCI_DENSE + CIA_PYXIS_BUG_BASE + 481 (i * 65536))); 482 } 483 484 /* 485 * Restore normal PCI operation. 486 */ 487 alpha_mb(); 488 REGVAL(CIA_CSR_CTRL) = ctrl; 489 alpha_mb(); 490 491 splx(s); 492 } 493
Indexes created Wed Oct 01 13:09:50 GMT 2025