dwlpx_dma.c revision 1.17.8.1
1 /* $NetBSD: dwlpx_dma.c,v 1.17.8.1 2009/04/28 07:33:35 skrll 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 1.17.8.1 2009/04/28 07:33:35 skrll 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(bus_dma_tag_t, alpha_bus_t); 58 59 int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 60 bus_size_t, struct proc *, int); 61 62 int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 63 struct mbuf *, int); 64 65 int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 66 struct uio *, int); 67 68 int dwlpx_bus_dmamap_load_raw_sgmap(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(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(struct dwlpx_config *ccp) 99 { 100 char *exname; 101 bus_dma_tag_t t; 102 u_int32_t *page_table; 103 int i, lim, wmask; 104 105 /* 106 * Determine size of Window C based on the amount of SGMAP 107 * page table SRAM available. 108 */ 109 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 110 lim = 128 * 1024; 111 wmask = PCIA_WMASK_1G; 112 } else { 113 lim = 32 * 1024; 114 wmask = PCIA_WMASK_256M; 115 } 116 117 /* 118 * Initialize the DMA tag used for direct-mapped DMA. Chain 119 * this window to the SGMAP window, because we might have 120 * a lot of memory in the machine. 121 */ 122 t = &ccp->cc_dmat_direct; 123 t->_cookie = ccp; 124 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 125 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 126 t->_next_window = &ccp->cc_dmat_sgmap; 127 t->_boundary = 0; 128 t->_sgmap = NULL; 129 t->_get_tag = dwlpx_dma_get_tag; 130 t->_dmamap_create = _bus_dmamap_create; 131 t->_dmamap_destroy = _bus_dmamap_destroy; 132 t->_dmamap_load = _bus_dmamap_load_direct; 133 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 134 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 135 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 136 t->_dmamap_unload = _bus_dmamap_unload; 137 t->_dmamap_sync = _bus_dmamap_sync; 138 139 t->_dmamem_alloc = _bus_dmamem_alloc; 140 t->_dmamem_free = _bus_dmamem_free; 141 t->_dmamem_map = _bus_dmamem_map; 142 t->_dmamem_unmap = _bus_dmamem_unmap; 143 t->_dmamem_mmap = _bus_dmamem_mmap; 144 145 /* 146 * Initialize the DMA tag used for sgmap-mapped DMA. 147 */ 148 t = &ccp->cc_dmat_sgmap; 149 t->_cookie = ccp; 150 t->_wbase = DWLPx_SG_MAPPED_BASE; 151 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 152 t->_next_window = NULL; 153 t->_boundary = 0; 154 t->_sgmap = &ccp->cc_sgmap; 155 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; 156 t->_get_tag = dwlpx_dma_get_tag; 157 t->_dmamap_create = alpha_sgmap_dmamap_create; 158 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 159 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 160 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 161 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 162 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 163 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 164 t->_dmamap_sync = _bus_dmamap_sync; 165 166 t->_dmamem_alloc = _bus_dmamem_alloc; 167 t->_dmamem_free = _bus_dmamem_free; 168 t->_dmamem_map = _bus_dmamem_map; 169 t->_dmamem_unmap = _bus_dmamem_unmap; 170 t->_dmamem_mmap = _bus_dmamem_mmap; 171 172 /* 173 * A few notes about SGMAP-mapped DMA on the DWLPx: 174 * 175 * The DWLPx has PCIA-resident SRAM that is used for 176 * the SGMAP page table; there is no TLB. The DWLPA 177 * has room for 32K entries, yielding a total of 256M 178 * of sgva space. The DWLPB has 32K entries or 128K 179 * entries, depending on TBIT, yielding either 256M or 180 * 1G of sgva space. 181 * 182 * This sgva space must be shared across all windows 183 * that wish to use SGMAP-mapped DMA; make sure to 184 * adjust the "sgvabase" argument to alpha_sgmap_init() 185 * accordingly if you create more than one SGMAP-mapped 186 * window. Note that sgvabase != window base. The former 187 * is used to compute indexes into the page table only. 188 * 189 * In the current implementation the first window is a 190 * 2G window direct-mapped mapped at 2G and the second 191 * window is disabled and the third window is a 256M 192 * or 1GB scatter/gather map at 1GB. 193 * 194 * We just punt on trying to support ISA DMA. If you want 195 * try that on a TurboLaser, well, you just lose. 196 */ 197 198 /* 199 * Initialize the page table. 200 */ 201 page_table = 202 (u_int32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 203 for (i = 0; i < lim; i++) 204 page_table[i * SGMAP_PTE_SPACING] = 0; 205 alpha_mb(); 206 207 /* 208 * Initialize the SGMAP for window C: 209 * 210 * Size: 256M or 1GB 211 * Window base: 1GB 212 * SGVA base: 0 213 */ 214 exname = malloc(16, M_DEVBUF, M_NOWAIT); 215 if (exname == NULL) 216 panic("dwlpx_dma_init"); 217 sprintf(exname, "%s_sgmap_a", ccp->cc_sc->dwlpx_dev.dv_xname); 218 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 219 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(u_int32_t), 220 (void *)page_table, 0); 221 222 /* 223 * Set up DMA windows for this DWLPx. 224 * 225 * Do this even for all HPCs- even for the nonexistent 226 * one on hose zero of a KFTIA. 227 */ 228 for (i = 0; i < NHPC; i++) { 229 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 230 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 231 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 232 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 233 234 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 235 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 236 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 237 238 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 239 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 240 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 241 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 242 alpha_mb(); 243 } 244 245 /* XXX XXX BEGIN XXX XXX */ 246 { /* XXX */ 247 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 248 alpha_XXX_dmamap_or = DWLPx_DIRECT_MAPPED_BASE; /* XXX */ 249 } /* XXX */ 250 /* XXX XXX END XXX XXX */ 251 } 252 253 /* 254 * Return the bus dma tag to be used for the specified bus type. 255 * INTERNAL USE ONLY! 256 */ 257 bus_dma_tag_t 258 dwlpx_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 259 { 260 struct dwlpx_config *ccp = t->_cookie; 261 262 switch (bustype) { 263 case ALPHA_BUS_PCI: 264 case ALPHA_BUS_EISA: 265 if (dwlpx_always_use_sgmap) { 266 /* 267 * Always use SGMAPs (for testing purposes?) 268 */ 269 return (&ccp->cc_dmat_sgmap); 270 } 271 /* 272 * Give these busses the direct-mapped window; if the 273 * address crosses the threshold, it will fall back 274 * onto the SGMAP window. 275 */ 276 return (&ccp->cc_dmat_direct); 277 278 case ALPHA_BUS_ISA: 279 /* 280 * Don't even bother; it's not easy, given how the 281 * page table is arranged, and it's not really worth 282 * the trouble. 283 */ 284 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 285 /* NOTREACHED */ 286 287 default: 288 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 289 } 290 } 291 292 /* 293 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 294 */ 295 int 296 dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) 297 { 298 299 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 300 t->_sgmap)); 301 } 302 303 /* 304 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 305 */ 306 int 307 dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 308 { 309 310 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 311 } 312 313 /* 314 * Load a DWLPx SGMAP-mapped DMA map with a uio. 315 */ 316 int 317 dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 318 { 319 320 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 321 } 322 323 /* 324 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 325 */ 326 int 327 dwlpx_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 328 { 329 330 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 331 t->_sgmap)); 332 } 333 334 /* 335 * Unload a DWLPx DMA map. 336 */ 337 void 338 dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 339 { 340 341 /* 342 * Invalidate any SGMAP page table entries used by this 343 * mapping. 344 */ 345 pci_sgmap_pte32_unload(t, map, t->_sgmap); 346 347 /* 348 * Do the generic bits of the unload. 349 */ 350 _bus_dmamap_unload(t, map); 351 } 352
Indexes created Sat Oct 25 16:10:12 GMT 2025