dwlpx_dma.c revision 1.16.124.1
1 /* $NetBSD: dwlpx_dma.c,v 1.16.124.1 2008/06/02 13:21:47 mjf 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 35 __KERNEL_RCSID(0, "$NetBSD: dwlpx_dma.c,v 1.16.124.1 2008/06/02 13:21:47 mjf Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 #include <sys/malloc.h> 42 43 #include <uvm/uvm_extern.h> 44 45 #define _ALPHA_BUS_DMA_PRIVATE 46 #include <machine/bus.h> 47 48 #include <dev/pci/pcireg.h> 49 #include <dev/pci/pcivar.h> 50 #include <alpha/tlsb/tlsbreg.h> 51 #include <alpha/tlsb/kftxxvar.h> 52 #include <alpha/tlsb/kftxxreg.h> 53 #include <alpha/pci/dwlpxreg.h> 54 #include <alpha/pci/dwlpxvar.h> 55 #include <alpha/pci/pci_kn8ae.h> 56 57 bus_dma_tag_t dwlpx_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 58 59 int dwlpx_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 60 bus_size_t, struct proc *, int)); 61 62 int dwlpx_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 63 struct mbuf *, int)); 64 65 int dwlpx_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 66 struct uio *, int)); 67 68 int dwlpx_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 69 bus_dma_segment_t *, int, bus_size_t, int)); 70 71 void dwlpx_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 72 73 /* 74 * Direct-mapped window: 2G at 2G 75 */ 76 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 77 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 78 79 /* 80 * SGMAP window A: 256M or 1G at 1G 81 */ 82 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) 83 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) 84 85 /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */ 86 #define DWLPx_SG_MAPPED_PFTHRESH 256 87 88 /* 89 * Set this to always use SGMAPs. 90 */ 91 #ifdef DWLPX_ALWAYS_USE_SGMAP 92 int dwlpx_always_use_sgmap = 1; 93 #else 94 int dwlpx_always_use_sgmap = 0; 95 #endif 96 97 void 98 dwlpx_dma_init(ccp) 99 struct dwlpx_config *ccp; 100 { 101 char *exname; 102 bus_dma_tag_t t; 103 u_int32_t *page_table; 104 int i, lim, wmask; 105 106 /* 107 * Determine size of Window C based on the amount of SGMAP 108 * page table SRAM available. 109 */ 110 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 111 lim = 128 * 1024; 112 wmask = PCIA_WMASK_1G; 113 } else { 114 lim = 32 * 1024; 115 wmask = PCIA_WMASK_256M; 116 } 117 118 /* 119 * Initialize the DMA tag used for direct-mapped DMA. Chain 120 * this window to the SGMAP window, because we might have 121 * a lot of memory in the machine. 122 */ 123 t = &ccp->cc_dmat_direct; 124 t->_cookie = ccp; 125 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 126 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 127 t->_next_window = &ccp->cc_dmat_sgmap; 128 t->_boundary = 0; 129 t->_sgmap = NULL; 130 t->_get_tag = dwlpx_dma_get_tag; 131 t->_dmamap_create = _bus_dmamap_create; 132 t->_dmamap_destroy = _bus_dmamap_destroy; 133 t->_dmamap_load = _bus_dmamap_load_direct; 134 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 135 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 136 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 137 t->_dmamap_unload = _bus_dmamap_unload; 138 t->_dmamap_sync = _bus_dmamap_sync; 139 140 t->_dmamem_alloc = _bus_dmamem_alloc; 141 t->_dmamem_free = _bus_dmamem_free; 142 t->_dmamem_map = _bus_dmamem_map; 143 t->_dmamem_unmap = _bus_dmamem_unmap; 144 t->_dmamem_mmap = _bus_dmamem_mmap; 145 146 /* 147 * Initialize the DMA tag used for sgmap-mapped DMA. 148 */ 149 t = &ccp->cc_dmat_sgmap; 150 t->_cookie = ccp; 151 t->_wbase = DWLPx_SG_MAPPED_BASE; 152 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 153 t->_next_window = NULL; 154 t->_boundary = 0; 155 t->_sgmap = &ccp->cc_sgmap; 156 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; 157 t->_get_tag = dwlpx_dma_get_tag; 158 t->_dmamap_create = alpha_sgmap_dmamap_create; 159 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 160 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 161 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 162 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 163 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 164 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 165 t->_dmamap_sync = _bus_dmamap_sync; 166 167 t->_dmamem_alloc = _bus_dmamem_alloc; 168 t->_dmamem_free = _bus_dmamem_free; 169 t->_dmamem_map = _bus_dmamem_map; 170 t->_dmamem_unmap = _bus_dmamem_unmap; 171 t->_dmamem_mmap = _bus_dmamem_mmap; 172 173 /* 174 * A few notes about SGMAP-mapped DMA on the DWLPx: 175 * 176 * The DWLPx has PCIA-resident SRAM that is used for 177 * the SGMAP page table; there is no TLB. The DWLPA 178 * has room for 32K entries, yielding a total of 256M 179 * of sgva space. The DWLPB has 32K entries or 128K 180 * entries, depending on TBIT, yielding either 256M or 181 * 1G of sgva space. 182 * 183 * This sgva space must be shared across all windows 184 * that wish to use SGMAP-mapped DMA; make sure to 185 * adjust the "sgvabase" argument to alpha_sgmap_init() 186 * accordingly if you create more than one SGMAP-mapped 187 * window. Note that sgvabase != window base. The former 188 * is used to compute indexes into the page table only. 189 * 190 * In the current implementation the first window is a 191 * 2G window direct-mapped mapped at 2G and the second 192 * window is disabled and the third window is a 256M 193 * or 1GB scatter/gather map at 1GB. 194 * 195 * We just punt on trying to support ISA DMA. If you want 196 * try that on a TurboLaser, well, you just lose. 197 */ 198 199 /* 200 * Initialize the page table. 201 */ 202 page_table = 203 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 204 for (i = 0; i < lim; i++) 205 page_table[i * SGMAP_PTE_SPACING] = 0; 206 alpha_mb(); 207 208 /* 209 * Initialize the SGMAP for window C: 210 * 211 * Size: 256M or 1GB 212 * Window base: 1GB 213 * SGVA base: 0 214 */ 215 exname = malloc(16, M_DEVBUF, M_NOWAIT); 216 if (exname == NULL) 217 panic("dwlpx_dma_init"); 218 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 219 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 220 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(u_int32_t), 221 (void *)page_table, 0); 222 223 /* 224 * Set up DMA windows for this DWLPx. 225 * 226 * Do this even for all HPCs- even for the nonexistent 227 * one on hose zero of a KFTIA. 228 */ 229 for (i = 0; i < NHPC; i++) { 230 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 231 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 232 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 233 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 234 235 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 236 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 237 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 238 239 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 240 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 241 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 242 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 243 alpha_mb(); 244 } 245 246 /* XXX XXX BEGIN XXX XXX */ 247 { /* XXX */ 248 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 249 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 250 } /* XXX */ 251 /* XXX XXX END XXX XXX */ 252 } 253 254 /* 255 * Return the bus dma tag to be used for the specified bus type. 256 * INTERNAL USE ONLY! 257 */ 258 bus_dma_tag_t 259 dwlpx_dma_get_tag(t, bustype) 260 bus_dma_tag_t t; 261 alpha_bus_t bustype; 262 { 263 struct dwlpx_config *ccp = t->_cookie; 264 265 switch (bustype) { 266 case ALPHA_BUS_PCI: 267 case ALPHA_BUS_EISA: 268 if (dwlpx_always_use_sgmap) { 269 /* 270 * Always use SGMAPs (for testing purposes?) 271 */ 272 return (&ccp->cc_dmat_sgmap); 273 } 274 /* 275 * Give these busses the direct-mapped window; if the 276 * address crosses the threshold, it will fall back 277 * onto the SGMAP window. 278 */ 279 return (&ccp->cc_dmat_direct); 280 281 case ALPHA_BUS_ISA: 282 /* 283 * Don't even bother; it's not easy, given how the 284 * page table is arranged, and it's not really worth 285 * the trouble. 286 */ 287 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 288 /* NOTREACHED */ 289 290 default: 291 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 292 } 293 } 294 295 /* 296 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 297 */ 298 int 299 dwlpx_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 { 307 308 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 309 t->_sgmap)); 310 } 311 312 /* 313 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 314 */ 315 int 316 dwlpx_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 317 bus_dma_tag_t t; 318 bus_dmamap_t map; 319 struct mbuf *m; 320 int flags; 321 { 322 323 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 324 } 325 326 /* 327 * Load a DWLPx SGMAP-mapped DMA map with a uio. 328 */ 329 int 330 dwlpx_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 331 bus_dma_tag_t t; 332 bus_dmamap_t map; 333 struct uio *uio; 334 int flags; 335 { 336 337 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 338 } 339 340 /* 341 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 342 */ 343 int 344 dwlpx_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 345 bus_dma_tag_t t; 346 bus_dmamap_t map; 347 bus_dma_segment_t *segs; 348 int nsegs; 349 bus_size_t size; 350 int flags; 351 { 352 353 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 354 t->_sgmap)); 355 } 356 357 /* 358 * Unload a DWLPx DMA map. 359 */ 360 void 361 dwlpx_bus_dmamap_unload_sgmap(t, map) 362 bus_dma_tag_t t; 363 bus_dmamap_t map; 364 { 365 366 /* 367 * Invalidate any SGMAP page table entries used by this 368 * mapping. 369 */ 370 pci_sgmap_pte32_unload(t, map, t->_sgmap); 371 372 /* 373 * Do the generic bits of the unload. 374 */ 375 _bus_dmamap_unload(t, map); 376 } 377
Indexes created Sun Oct 26 13:09:57 GMT 2025