ttwoga_dma.c revision 1.3.124.1
1 /* $NetBSD: ttwoga_dma.c,v 1.3.124.1 2008/06/02 13:21:47 mjf Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 33 34 __KERNEL_RCSID(0, "$NetBSD: ttwoga_dma.c,v 1.3.124.1 2008/06/02 13:21:47 mjf Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/device.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #define _ALPHA_BUS_DMA_PRIVATE 44 #include <machine/bus.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 49 #include <alpha/pci/ttwogareg.h> 50 #include <alpha/pci/ttwogavar.h> 51 52 bus_dma_tag_t ttwoga_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 53 54 int ttwoga_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 55 bus_size_t, struct proc *, int); 56 57 int ttwoga_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 58 struct mbuf *, int); 59 60 int ttwoga_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct uio *, int); 62 63 int ttwoga_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 64 bus_dma_segment_t *, int, bus_size_t, int); 65 66 void ttwoga_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 67 68 /* 69 * Direct-mapped window: 1G at 1G 70 */ 71 #define TTWOGA_DIRECT_MAPPED_BASE (1UL*1024UL*1024UL*1024UL) 72 #define TTWOGA_DIRECT_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL) 73 74 /* 75 * SGMAP window: 8M at 8M 76 */ 77 #define TTWOGA_SGMAP_MAPPED_BASE (8UL*1024UL*1024UL) 78 #define TTWOGA_SGMAP_MAPPED_SIZE (8UL*1024UL*1024UL) 79 80 /* T2 has a 256-byte out-bound DMA prefetch threshold. */ 81 #define TTWOGA_SGMAP_PFTHRESH 256 82 83 /* 84 * Macro to flush the T2 Gate Array scatter/gather TLB. 85 */ 86 #define TTWOGA_TLB_INVALIDATE(tcp) \ 87 do { \ 88 u_int64_t temp; \ 89 \ 90 alpha_mb(); \ 91 temp = T2GA((tcp), T2_IOCSR); \ 92 T2GA((tcp), T2_IOCSR) = temp | IOCSR_FTLB; \ 93 alpha_mb(); \ 94 alpha_mb(); /* MAGIC */ \ 95 T2GA((tcp), T2_IOCSR) = temp; \ 96 alpha_mb(); \ 97 alpha_mb(); /* MAGIC */ \ 98 } while (0) 99 100 void 101 ttwoga_dma_init(struct ttwoga_config *tcp) 102 { 103 bus_dma_tag_t t; 104 105 /* 106 * Initialize the DMA tag used for direct-mapped DMA. 107 */ 108 t = &tcp->tc_dmat_direct; 109 t->_cookie = tcp; 110 t->_wbase = TTWOGA_DIRECT_MAPPED_BASE; 111 t->_wsize = TTWOGA_DIRECT_MAPPED_SIZE; 112 t->_next_window = NULL; 113 t->_boundary = 0; 114 t->_sgmap = NULL; 115 t->_get_tag = ttwoga_dma_get_tag; 116 t->_dmamap_create = _bus_dmamap_create; 117 t->_dmamap_destroy = _bus_dmamap_destroy; 118 t->_dmamap_load = _bus_dmamap_load_direct; 119 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 120 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 121 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 122 t->_dmamap_unload = _bus_dmamap_unload; 123 t->_dmamap_sync = _bus_dmamap_sync; 124 125 t->_dmamem_alloc = _bus_dmamem_alloc; 126 t->_dmamem_free = _bus_dmamem_free; 127 t->_dmamem_map = _bus_dmamem_map; 128 t->_dmamem_unmap = _bus_dmamem_unmap; 129 t->_dmamem_mmap = _bus_dmamem_mmap; 130 131 /* 132 * Initialize the DMA tag used for sgmap-mapped DMA. 133 */ 134 t = &tcp->tc_dmat_sgmap; 135 t->_cookie = tcp; 136 t->_wbase = TTWOGA_SGMAP_MAPPED_BASE; 137 t->_wsize = TTWOGA_SGMAP_MAPPED_SIZE; 138 t->_next_window = NULL; 139 t->_boundary = 0; 140 t->_sgmap = &tcp->tc_sgmap; 141 t->_pfthresh = TTWOGA_SGMAP_PFTHRESH; 142 t->_get_tag = ttwoga_dma_get_tag; 143 t->_dmamap_create = alpha_sgmap_dmamap_create; 144 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 145 t->_dmamap_load = ttwoga_bus_dmamap_load_sgmap; 146 t->_dmamap_load_mbuf = ttwoga_bus_dmamap_load_mbuf_sgmap; 147 t->_dmamap_load_uio = ttwoga_bus_dmamap_load_uio_sgmap; 148 t->_dmamap_load_raw = ttwoga_bus_dmamap_load_raw_sgmap; 149 t->_dmamap_unload = ttwoga_bus_dmamap_unload_sgmap; 150 t->_dmamap_sync = _bus_dmamap_sync; 151 152 t->_dmamem_alloc = _bus_dmamem_alloc; 153 t->_dmamem_free = _bus_dmamem_free; 154 t->_dmamem_map = _bus_dmamem_map; 155 t->_dmamem_unmap = _bus_dmamem_unmap; 156 t->_dmamem_mmap = _bus_dmamem_mmap; 157 158 /* 159 * Disable the SGMAP TLB, and flush it. We reenable it if 160 * we have a Sable or a Gamma with T3 or T4; Gamma with T2 161 * has a TLB bug apparently severe enough to require disabling 162 * it. 163 */ 164 alpha_mb(); 165 T2GA(tcp, T2_IOCSR) &= ~IOCSR_ETLB; 166 alpha_mb(); 167 alpha_mb(); /* MAGIC */ 168 169 TTWOGA_TLB_INVALIDATE(tcp); 170 171 /* 172 * XXX We might want to make sure our DMA windows don't 173 * XXX overlap with PCI memory space! 174 */ 175 176 /* 177 * Set up window 1 as a 1G direct-mapped window 178 * starting at 1G. 179 */ 180 T2GA(tcp, T2_WBASE1) = 0; 181 alpha_mb(); 182 183 T2GA(tcp, T2_WMASK1) = (TTWOGA_DIRECT_MAPPED_SIZE - 1) & WMASKx_PWM; 184 alpha_mb(); 185 186 T2GA(tcp, T2_TBASE1) = 0; 187 alpha_mb(); 188 189 T2GA(tcp, T2_WBASE1) = TTWOGA_DIRECT_MAPPED_BASE | 190 ((TTWOGA_DIRECT_MAPPED_BASE + (TTWOGA_DIRECT_MAPPED_SIZE - 1)) >> 191 WBASEx_PWxA_SHIFT) | WBASEx_PWE; 192 alpha_mb(); 193 194 /* 195 * Initialize the SGMAP. 196 */ 197 alpha_sgmap_init(t, &tcp->tc_sgmap, "ttwoga_sgmap", 198 TTWOGA_SGMAP_MAPPED_BASE, 0, TTWOGA_SGMAP_MAPPED_SIZE, 199 sizeof(u_int64_t), NULL, 0); 200 201 /* 202 * Set up window 2 as an 8MB SGMAP-mapped window 203 * starting at 8MB. 204 */ 205 #ifdef DIAGNOSTIC 206 if ((TTWOGA_SGMAP_MAPPED_BASE & WBASEx_PWSA) != 207 TTWOGA_SGMAP_MAPPED_BASE) 208 panic("ttwoga_dma_init: SGMAP base inconsistency"); 209 #endif 210 T2GA(tcp, T2_WBASE2) = 0; 211 alpha_mb(); 212 213 T2GA(tcp, T2_WMASK2) = (TTWOGA_SGMAP_MAPPED_SIZE - 1) & WMASKx_PWM; 214 alpha_mb(); 215 216 T2GA(tcp, T2_TBASE2) = tcp->tc_sgmap.aps_ptpa >> 1; 217 alpha_mb(); 218 219 T2GA(tcp, T2_WBASE2) = TTWOGA_SGMAP_MAPPED_BASE | 220 ((TTWOGA_SGMAP_MAPPED_BASE + (TTWOGA_SGMAP_MAPPED_SIZE - 1)) >> 221 WBASEx_PWxA_SHIFT) | WBASEx_SGE | WBASEx_PWE; 222 alpha_mb(); 223 224 /* 225 * Enable SGMAP TLB on Sable or Gamma with T3 or T4; see above. 226 */ 227 if (alpha_implver() == ALPHA_IMPLVER_EV4 || 228 tcp->tc_rev >= TRN_T3) { 229 alpha_mb(); 230 T2GA(tcp, T2_IOCSR) |= IOCSR_ETLB; 231 alpha_mb(); 232 alpha_mb(); /* MAGIC */ 233 tcp->tc_use_tlb = 1; 234 } 235 236 /* XXX XXX BEGIN XXX XXX */ 237 { /* XXX */ 238 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 239 alpha_XXX_dmamap_or = TTWOGA_DIRECT_MAPPED_BASE;/* XXX */ 240 } /* XXX */ 241 /* XXX XXX END XXX XXX */ 242 } 243 244 /* 245 * Return the bus dma tag to be used for the specified bus type. 246 * INTERNAL USE ONLY! 247 */ 248 bus_dma_tag_t 249 ttwoga_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 250 { 251 struct ttwoga_config *tcp = t->_cookie; 252 253 switch (bustype) { 254 case ALPHA_BUS_PCI: 255 case ALPHA_BUS_EISA: 256 /* 257 * Systems with a T2 Gate Array can have 2G 258 * of memory, but we only get a direct-mapped 259 * window of 1G! 260 * 261 * XXX FIX THIS SOMEDAY! 262 */ 263 return (&tcp->tc_dmat_direct); 264 265 case ALPHA_BUS_ISA: 266 /* 267 * ISA doesn't have enough address bits to use 268 * the direct-mapped DMA window, so we must use 269 * SGMAPs. 270 */ 271 return (&tcp->tc_dmat_sgmap); 272 273 default: 274 panic("ttwoga_dma_get_tag: shouldn't be here, really..."); 275 } 276 } 277 278 /* 279 * Load a T2 SGMAP-mapped DMA map with a liner buffer. 280 */ 281 int 282 ttwoga_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 283 bus_size_t buflen, struct proc *p, int flags) 284 { 285 struct ttwoga_config *tcp = t->_cookie; 286 int error; 287 288 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 289 t->_sgmap); 290 if (error == 0 && tcp->tc_use_tlb) 291 TTWOGA_TLB_INVALIDATE(tcp); 292 293 return (error); 294 } 295 296 /* 297 * Load a T2 SGMAP-mapped DMA map with an mbuf chain. 298 */ 299 int 300 ttwoga_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 301 struct mbuf *m, int flags) 302 { 303 struct ttwoga_config *tcp = t->_cookie; 304 int error; 305 306 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 307 if (error == 0 && tcp->tc_use_tlb) 308 TTWOGA_TLB_INVALIDATE(tcp); 309 310 return (error); 311 } 312 313 /* 314 * Load a T2 SGMAP-mapped DMA map with a uio. 315 */ 316 int 317 ttwoga_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 318 struct uio *uio, int flags) 319 { 320 struct ttwoga_config *tcp = t->_cookie; 321 int error; 322 323 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 324 if (error == 0 && tcp->tc_use_tlb) 325 TTWOGA_TLB_INVALIDATE(tcp); 326 327 return (error); 328 } 329 330 /* 331 * Load a T2 SGMAP-mapped DMA map with raw memory. 332 */ 333 int 334 ttwoga_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 335 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 336 { 337 struct ttwoga_config *tcp = t->_cookie; 338 int error; 339 340 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 341 t->_sgmap); 342 if (error == 0 && tcp->tc_use_tlb) 343 TTWOGA_TLB_INVALIDATE(tcp); 344 345 return (error); 346 } 347 348 /* 349 * Unload an T2 DMA map. 350 */ 351 void 352 ttwoga_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 353 { 354 struct ttwoga_config *tcp = t->_cookie; 355 356 /* 357 * Invalidate any SGMAP page table entries used by this 358 * mapping. 359 */ 360 pci_sgmap_pte64_unload(t, map, t->_sgmap); 361 if (tcp->tc_use_tlb) 362 TTWOGA_TLB_INVALIDATE(tcp); 363 364 /* 365 * Do the generic bits of the unload. 366 */ 367 _bus_dmamap_unload(t, map); 368 } 369
Indexes created Sat Nov 01 05:10:12 GMT 2025