dwlpx_dma.c revision 1.15
1 /* $NetBSD: dwlpx_dma.c,v 1.15 2001/01/03 19:16:00 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: dwlpx_dma.c,v 1.15 2001/01/03 19:16:00 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/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 /* 93 * Set this to always use SGMAPs. 94 */ 95 #ifdef DWLPX_ALWAYS_USE_SGMAP 96 int dwlpx_always_use_sgmap = 1; 97 #else 98 int dwlpx_always_use_sgmap = 0; 99 #endif 100 101 void 102 dwlpx_dma_init(ccp) 103 struct dwlpx_config *ccp; 104 { 105 char *exname; 106 bus_dma_tag_t t; 107 u_int32_t *page_table; 108 int i, lim, wmask; 109 110 /* 111 * Determine size of Window C based on the amount of SGMAP 112 * page table SRAM available. 113 */ 114 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 115 lim = 128 * 1024; 116 wmask = PCIA_WMASK_1G; 117 } else { 118 lim = 32 * 1024; 119 wmask = PCIA_WMASK_256M; 120 } 121 122 /* 123 * Initialize the DMA tag used for direct-mapped DMA. Chain 124 * this window to the SGMAP window, because we might have 125 * a lot of memory in the machine. 126 */ 127 t = &ccp->cc_dmat_direct; 128 t->_cookie = ccp; 129 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 130 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 131 t->_next_window = &ccp->cc_dmat_sgmap; 132 t->_boundary = 0; 133 t->_sgmap = NULL; 134 t->_get_tag = dwlpx_dma_get_tag; 135 t->_dmamap_create = _bus_dmamap_create; 136 t->_dmamap_destroy = _bus_dmamap_destroy; 137 t->_dmamap_load = _bus_dmamap_load_direct; 138 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 139 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 140 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 141 t->_dmamap_unload = _bus_dmamap_unload; 142 t->_dmamap_sync = _bus_dmamap_sync; 143 144 t->_dmamem_alloc = _bus_dmamem_alloc; 145 t->_dmamem_free = _bus_dmamem_free; 146 t->_dmamem_map = _bus_dmamem_map; 147 t->_dmamem_unmap = _bus_dmamem_unmap; 148 t->_dmamem_mmap = _bus_dmamem_mmap; 149 150 /* 151 * Initialize the DMA tag used for sgmap-mapped DMA. 152 */ 153 t = &ccp->cc_dmat_sgmap; 154 t->_cookie = ccp; 155 t->_wbase = DWLPx_SG_MAPPED_BASE; 156 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 157 t->_next_window = NULL; 158 t->_boundary = 0; 159 t->_sgmap = &ccp->cc_sgmap; 160 t->_get_tag = dwlpx_dma_get_tag; 161 t->_dmamap_create = alpha_sgmap_dmamap_create; 162 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 163 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 164 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 165 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 166 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 167 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 168 t->_dmamap_sync = _bus_dmamap_sync; 169 170 t->_dmamem_alloc = _bus_dmamem_alloc; 171 t->_dmamem_free = _bus_dmamem_free; 172 t->_dmamem_map = _bus_dmamem_map; 173 t->_dmamem_unmap = _bus_dmamem_unmap; 174 t->_dmamem_mmap = _bus_dmamem_mmap; 175 176 /* 177 * A few notes about SGMAP-mapped DMA on the DWLPx: 178 * 179 * The DWLPx has PCIA-resident SRAM that is used for 180 * the SGMAP page table; there is no TLB. The DWLPA 181 * has room for 32K entries, yielding a total of 256M 182 * of sgva space. The DWLPB has 32K entries or 128K 183 * entries, depending on TBIT, yielding either 256M or 184 * 1G of sgva space. 185 * 186 * This sgva space must be shared across all windows 187 * that wish to use SGMAP-mapped DMA; make sure to 188 * adjust the "sgvabase" argument to alpha_sgmap_init() 189 * accordingly if you create more than one SGMAP-mapped 190 * window. Note that sgvabase != window base. The former 191 * is used to compute indexes into the page table only. 192 * 193 * In the current implementation the first window is a 194 * 2G window direct-mapped mapped at 2G and the second 195 * window is disabled and the third window is a 256M 196 * or 1GB scatter/gather map at 1GB. 197 * 198 * We just punt on trying to support ISA DMA. If you want 199 * try that on a TurboLaser, well, you just lose. 200 */ 201 202 /* 203 * Initialize the page table. 204 */ 205 page_table = 206 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 207 for (i = 0; i < lim; i++) 208 page_table[i * SGMAP_PTE_SPACING] = 0; 209 alpha_mb(); 210 211 /* 212 * Initialize the SGMAP for window C: 213 * 214 * Size: 256M or 1GB 215 * Window base: 1GB 216 * SGVA base: 0 217 */ 218 exname = malloc(16, M_DEVBUF, M_NOWAIT); 219 if (exname == NULL) 220 panic("dwlpx_dma_init"); 221 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 222 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 223 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(u_int32_t), 224 (void *)page_table, 0); 225 226 /* 227 * Set up DMA windows for this DWLPx. 228 * 229 * Do this even for all HPCs- even for the nonexistent 230 * one on hose zero of a KFTIA. 231 */ 232 for (i = 0; i < NHPC; i++) { 233 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 234 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 235 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 236 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 237 238 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 239 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 240 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 241 242 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 243 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 244 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 245 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 246 alpha_mb(); 247 } 248 249 /* XXX XXX BEGIN XXX XXX */ 250 { /* XXX */ 251 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 252 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 253 } /* XXX */ 254 /* XXX XXX END XXX XXX */ 255 } 256 257 /* 258 * Return the bus dma tag to be used for the specified bus type. 259 * INTERNAL USE ONLY! 260 */ 261 bus_dma_tag_t 262 dwlpx_dma_get_tag(t, bustype) 263 bus_dma_tag_t t; 264 alpha_bus_t bustype; 265 { 266 struct dwlpx_config *ccp = t->_cookie; 267 268 switch (bustype) { 269 case ALPHA_BUS_PCI: 270 case ALPHA_BUS_EISA: 271 if (dwlpx_always_use_sgmap) { 272 /* 273 * Always use SGMAPs (for testing purposes?) 274 */ 275 return (&ccp->cc_dmat_sgmap); 276 } 277 /* 278 * Give these busses the direct-mapped window; if the 279 * address crosses the threshold, it will fall back 280 * onto the SGMAP window. 281 */ 282 return (&ccp->cc_dmat_direct); 283 284 case ALPHA_BUS_ISA: 285 /* 286 * Don't even bother; it's not easy, given how the 287 * page table is arranged, and it's not really worth 288 * the trouble. 289 */ 290 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 291 /* NOTREACHED */ 292 293 default: 294 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 295 } 296 } 297 298 /* 299 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 300 */ 301 int 302 dwlpx_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 303 bus_dma_tag_t t; 304 bus_dmamap_t map; 305 void *buf; 306 bus_size_t buflen; 307 struct proc *p; 308 int flags; 309 { 310 311 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 312 t->_sgmap)); 313 } 314 315 /* 316 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 317 */ 318 int 319 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 320 bus_dma_tag_t t; 321 bus_dmamap_t map; 322 struct mbuf *m; 323 int flags; 324 { 325 326 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 327 } 328 329 /* 330 * Load a DWLPx SGMAP-mapped DMA map with a uio. 331 */ 332 int 333 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 334 bus_dma_tag_t t; 335 bus_dmamap_t map; 336 struct uio *uio; 337 int flags; 338 { 339 340 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 341 } 342 343 /* 344 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 345 */ 346 int 347 dwlpx_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 348 bus_dma_tag_t t; 349 bus_dmamap_t map; 350 bus_dma_segment_t *segs; 351 int nsegs; 352 bus_size_t size; 353 int flags; 354 { 355 356 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 357 t->_sgmap)); 358 } 359 360 /* 361 * Unload a DWLPx DMA map. 362 */ 363 void 364 dwlpx_bus_dmamap_unload_sgmap(t, map) 365 bus_dma_tag_t t; 366 bus_dmamap_t map; 367 { 368 369 /* 370 * Invalidate any SGMAP page table entries used by this 371 * mapping. 372 */ 373 pci_sgmap_pte32_unload(t, map, t->_sgmap); 374 375 /* 376 * Do the generic bits of the unload. 377 */ 378 _bus_dmamap_unload(t, map); 379 } 380
Indexes created Sat Oct 25 16:10:12 GMT 2025