dwlpx_dma.c revision 1.15.4.1
1 /* $NetBSD: dwlpx_dma.c,v 1.15.4.1 2001/08/03 04:10:46 lukem 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 1.15.4.1 2001/08/03 04:10:46 lukem 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/tlsb/tlsbreg.h> 58 #include <alpha/tlsb/kftxxvar.h> 59 #include <alpha/tlsb/kftxxreg.h> 60 #include <alpha/pci/dwlpxreg.h> 61 #include <alpha/pci/dwlpxvar.h> 62 #include <alpha/pci/pci_kn8ae.h> 63 64 bus_dma_tag_t dwlpx_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 65 66 int dwlpx_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 67 bus_size_t, struct proc *, int)); 68 69 int dwlpx_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 70 struct mbuf *, int)); 71 72 int dwlpx_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 73 struct uio *, int)); 74 75 int dwlpx_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 76 bus_dma_segment_t *, int, bus_size_t, int)); 77 78 void dwlpx_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 79 80 /* 81 * Direct-mapped window: 2G at 2G 82 */ 83 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 84 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 85 86 /* 87 * SGMAP window A: 256M or 1G at 1G 88 */ 89 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) 90 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) 91 92 /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */ 93 #define DWLPx_SG_MAPPED_PFTHRESH 256 94 95 /* 96 * Set this to always use SGMAPs. 97 */ 98 #ifdef DWLPX_ALWAYS_USE_SGMAP 99 int dwlpx_always_use_sgmap = 1; 100 #else 101 int dwlpx_always_use_sgmap = 0; 102 #endif 103 104 void 105 dwlpx_dma_init(ccp) 106 struct dwlpx_config *ccp; 107 { 108 char *exname; 109 bus_dma_tag_t t; 110 u_int32_t *page_table; 111 int i, lim, wmask; 112 113 /* 114 * Determine size of Window C based on the amount of SGMAP 115 * page table SRAM available. 116 */ 117 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 118 lim = 128 * 1024; 119 wmask = PCIA_WMASK_1G; 120 } else { 121 lim = 32 * 1024; 122 wmask = PCIA_WMASK_256M; 123 } 124 125 /* 126 * Initialize the DMA tag used for direct-mapped DMA. Chain 127 * this window to the SGMAP window, because we might have 128 * a lot of memory in the machine. 129 */ 130 t = &ccp->cc_dmat_direct; 131 t->_cookie = ccp; 132 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 133 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 134 t->_next_window = &ccp->cc_dmat_sgmap; 135 t->_boundary = 0; 136 t->_sgmap = NULL; 137 t->_get_tag = dwlpx_dma_get_tag; 138 t->_dmamap_create = _bus_dmamap_create; 139 t->_dmamap_destroy = _bus_dmamap_destroy; 140 t->_dmamap_load = _bus_dmamap_load_direct; 141 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 142 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 143 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 144 t->_dmamap_unload = _bus_dmamap_unload; 145 t->_dmamap_sync = _bus_dmamap_sync; 146 147 t->_dmamem_alloc = _bus_dmamem_alloc; 148 t->_dmamem_free = _bus_dmamem_free; 149 t->_dmamem_map = _bus_dmamem_map; 150 t->_dmamem_unmap = _bus_dmamem_unmap; 151 t->_dmamem_mmap = _bus_dmamem_mmap; 152 153 /* 154 * Initialize the DMA tag used for sgmap-mapped DMA. 155 */ 156 t = &ccp->cc_dmat_sgmap; 157 t->_cookie = ccp; 158 t->_wbase = DWLPx_SG_MAPPED_BASE; 159 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 160 t->_next_window = NULL; 161 t->_boundary = 0; 162 t->_sgmap = &ccp->cc_sgmap; 163 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; 164 t->_get_tag = dwlpx_dma_get_tag; 165 t->_dmamap_create = alpha_sgmap_dmamap_create; 166 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 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 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 304 */ 305 int 306 dwlpx_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 307 bus_dma_tag_t t; 308 bus_dmamap_t map; 309 void *buf; 310 bus_size_t buflen; 311 struct proc *p; 312 int flags; 313 { 314 315 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 316 t->_sgmap)); 317 } 318 319 /* 320 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 321 */ 322 int 323 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 324 bus_dma_tag_t t; 325 bus_dmamap_t map; 326 struct mbuf *m; 327 int flags; 328 { 329 330 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 331 } 332 333 /* 334 * Load a DWLPx SGMAP-mapped DMA map with a uio. 335 */ 336 int 337 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 338 bus_dma_tag_t t; 339 bus_dmamap_t map; 340 struct uio *uio; 341 int flags; 342 { 343 344 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 345 } 346 347 /* 348 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 349 */ 350 int 351 dwlpx_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 352 bus_dma_tag_t t; 353 bus_dmamap_t map; 354 bus_dma_segment_t *segs; 355 int nsegs; 356 bus_size_t size; 357 int flags; 358 { 359 360 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 361 t->_sgmap)); 362 } 363 364 /* 365 * Unload a DWLPx DMA map. 366 */ 367 void 368 dwlpx_bus_dmamap_unload_sgmap(t, map) 369 bus_dma_tag_t t; 370 bus_dmamap_t map; 371 { 372 373 /* 374 * Invalidate any SGMAP page table entries used by this 375 * mapping. 376 */ 377 pci_sgmap_pte32_unload(t, map, t->_sgmap); 378 379 /* 380 * Do the generic bits of the unload. 381 */ 382 _bus_dmamap_unload(t, map); 383 } 384
Indexes created Sat Oct 25 16:10:12 GMT 2025