mcpcia_dma.c revision 1.25
1 /* $NetBSD: mcpcia_dma.c,v 1.25 2021/06/19 16:36:36 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 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 and Matthew Jacob of the Numerical Aerospace Simulation 9 * Facility, 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: mcpcia_dma.c,v 1.25 2021/06/19 16:36:36 thorpej 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 #define _ALPHA_BUS_DMA_PRIVATE 44 #include <sys/bus.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 #include <alpha/pci/mcpciareg.h> 49 #include <alpha/pci/mcpciavar.h> 50 51 static bus_dma_tag_t mcpcia_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 52 53 static int mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, 54 void *, bus_size_t, struct proc *, int); 55 56 static int mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 57 struct mbuf *, int); 58 59 static int mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 60 struct uio *, int); 61 62 static int mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 63 bus_dma_segment_t *, int, bus_size_t, int); 64 65 static void mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 66 67 /* 68 * Direct-mapped window: 2G at 2G 69 */ 70 #define MCPCIA_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 71 #define MCPCIA_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 72 73 /* 74 * SGMAP window for PCI: 1G at 1G 75 */ 76 #define MCPCIA_PCI_SG_MAPPED_BASE (1UL*1024UL*1024UL*1024UL) 77 #define MCPCIA_PCI_SG_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL) 78 79 /* 80 * SGMAP window for ISA: 8M at 8M 81 */ 82 #define MCPCIA_ISA_SG_MAPPED_BASE (8*1024*1024) 83 #define MCPCIA_ISA_SG_MAPPED_SIZE (8*1024*1024) 84 85 /* MCPCIA has a 256-byte out-bound DMA prefetch threshold. */ 86 #define MCPCIA_SG_MAPPED_PFTHRESH 256 87 88 #define MCPCIA_SGTLB_INVALIDATE(ccp) \ 89 do { \ 90 alpha_mb(); \ 91 REGVAL(MCPCIA_SG_TBIA(ccp)) = 0xdeadbeef; \ 92 alpha_mb(); \ 93 } while (0) 94 95 void 96 mcpcia_dma_init(struct mcpcia_config *ccp) 97 { 98 bus_dma_tag_t t; 99 100 /* 101 * Initialize the DMA tag used for direct-mapped DMA. 102 */ 103 t = &ccp->cc_dmat_direct; 104 t->_cookie = ccp; 105 t->_wbase = MCPCIA_DIRECT_MAPPED_BASE; 106 t->_wsize = MCPCIA_DIRECT_MAPPED_SIZE; 107 t->_next_window = &ccp->cc_dmat_pci_sgmap; 108 t->_boundary = 0; 109 t->_sgmap = NULL; 110 t->_get_tag = mcpcia_dma_get_tag; 111 t->_dmamap_create = _bus_dmamap_create; 112 t->_dmamap_destroy = _bus_dmamap_destroy; 113 t->_dmamap_load = _bus_dmamap_load_direct; 114 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 115 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 116 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 117 t->_dmamap_unload = _bus_dmamap_unload; 118 t->_dmamap_sync = _bus_dmamap_sync; 119 120 t->_dmamem_alloc = _bus_dmamem_alloc; 121 t->_dmamem_free = _bus_dmamem_free; 122 t->_dmamem_map = _bus_dmamem_map; 123 t->_dmamem_unmap = _bus_dmamem_unmap; 124 t->_dmamem_mmap = _bus_dmamem_mmap; 125 126 /* 127 * Initialize the DMA tag used for sgmap-mapped PCI DMA. 128 */ 129 t = &ccp->cc_dmat_pci_sgmap; 130 t->_cookie = ccp; 131 t->_wbase = MCPCIA_PCI_SG_MAPPED_BASE; 132 t->_wsize = MCPCIA_PCI_SG_MAPPED_SIZE; 133 t->_next_window = NULL; 134 t->_boundary = 0; 135 t->_sgmap = &ccp->cc_pci_sgmap; 136 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH; 137 t->_get_tag = mcpcia_dma_get_tag; 138 t->_dmamap_create = alpha_sgmap_dmamap_create; 139 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 140 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 141 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 142 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 143 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 144 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 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 ISA DMA. 155 */ 156 t = &ccp->cc_dmat_isa_sgmap; 157 t->_cookie = ccp; 158 t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE; 159 t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE; 160 t->_next_window = NULL; 161 t->_boundary = 0; 162 t->_sgmap = &ccp->cc_isa_sgmap; 163 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH; 164 t->_get_tag = mcpcia_dma_get_tag; 165 t->_dmamap_create = alpha_sgmap_dmamap_create; 166 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 167 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 168 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 169 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 170 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 171 t->_dmamap_unload = mcpcia_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 * Initialize the SGMAPs. 182 */ 183 alpha_sgmap_init(&ccp->cc_dmat_pci_sgmap, &ccp->cc_pci_sgmap, 184 "mcpcia pci sgmap", 185 MCPCIA_PCI_SG_MAPPED_BASE, 0, MCPCIA_PCI_SG_MAPPED_SIZE, 186 sizeof(uint64_t), NULL, 0); 187 188 alpha_sgmap_init(&ccp->cc_dmat_isa_sgmap, &ccp->cc_isa_sgmap, 189 "mcpcia isa sgmap", 190 MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE, 191 sizeof(uint64_t), NULL, 0); 192 193 /* 194 * Disable windows first. 195 */ 196 197 REGVAL(MCPCIA_W0_BASE(ccp)) = 0; 198 REGVAL(MCPCIA_W1_BASE(ccp)) = 0; 199 REGVAL(MCPCIA_W2_BASE(ccp)) = 0; 200 REGVAL(MCPCIA_W3_BASE(ccp)) = 0; 201 REGVAL(MCPCIA_T0_BASE(ccp)) = 0; 202 REGVAL(MCPCIA_T1_BASE(ccp)) = 0; 203 REGVAL(MCPCIA_T2_BASE(ccp)) = 0; 204 REGVAL(MCPCIA_T3_BASE(ccp)) = 0; 205 alpha_mb(); 206 207 /* 208 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB. 209 */ 210 REGVAL(MCPCIA_W0_MASK(ccp)) = MCPCIA_WMASK_8M; 211 REGVAL(MCPCIA_T0_BASE(ccp)) = 212 ccp->cc_isa_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 213 alpha_mb(); 214 REGVAL(MCPCIA_W0_BASE(ccp)) = 215 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE; 216 alpha_mb(); 217 218 MCPCIA_SGTLB_INVALIDATE(ccp); 219 220 /* 221 * Set up window 1 as a 2 GB Direct-mapped window starting at 2GB. 222 */ 223 224 REGVAL(MCPCIA_W1_MASK(ccp)) = MCPCIA_WMASK_2G; 225 REGVAL(MCPCIA_T1_BASE(ccp)) = 0; 226 alpha_mb(); 227 REGVAL(MCPCIA_W1_BASE(ccp)) = 228 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN; 229 alpha_mb(); 230 231 /* 232 * Set up window 2 as a 1G SGMAP-mapped window starting at 1G. 233 */ 234 235 REGVAL(MCPCIA_W2_MASK(ccp)) = MCPCIA_WMASK_1G; 236 REGVAL(MCPCIA_T2_BASE(ccp)) = 237 ccp->cc_pci_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 238 alpha_mb(); 239 REGVAL(MCPCIA_W2_BASE(ccp)) = 240 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_PCI_SG_MAPPED_BASE; 241 alpha_mb(); 242 } 243 244 /* 245 * Return the bus dma tag to be used for the specified bus type. 246 * INTERNAL USE ONLY! 247 */ 248 static bus_dma_tag_t 249 mcpcia_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 250 { 251 struct mcpcia_config *ccp = t->_cookie; 252 253 switch (bustype) { 254 case ALPHA_BUS_PCI: 255 case ALPHA_BUS_EISA: 256 /* 257 * Start off using the direct-mapped window. We will 258 * automatically fall backed onto the chained PCI SGMAP 259 * window if necessary. 260 */ 261 return (&ccp->cc_dmat_direct); 262 263 case ALPHA_BUS_ISA: 264 /* 265 * ISA doesn't have enough address bits to use 266 * the direct-mapped DMA window, so we must use 267 * SGMAPs. 268 */ 269 return (&ccp->cc_dmat_isa_sgmap); 270 271 default: 272 panic("mcpcia_dma_get_tag: shouldn't be here, really..."); 273 } 274 } 275 276 /* 277 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer. 278 */ 279 static int 280 mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) 281 { 282 int error; 283 struct mcpcia_config *ccp = t->_cookie; 284 285 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 286 t->_sgmap); 287 if (error == 0) 288 MCPCIA_SGTLB_INVALIDATE(ccp); 289 return (error); 290 } 291 292 /* 293 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain. 294 */ 295 static int 296 mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 297 { 298 int error; 299 struct mcpcia_config *ccp = t->_cookie; 300 301 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 302 if (error == 0) 303 MCPCIA_SGTLB_INVALIDATE(ccp); 304 return (error); 305 } 306 307 /* 308 * Load a MCPCIA SGMAP-mapped DMA map with a uio. 309 */ 310 static int 311 mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 312 { 313 int error; 314 struct mcpcia_config *ccp = t->_cookie; 315 316 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 317 if (error == 0) 318 MCPCIA_SGTLB_INVALIDATE(ccp); 319 return (error); 320 } 321 322 /* 323 * Load a MCPCIA SGMAP-mapped DMA map with raw memory. 324 */ 325 static int 326 mcpcia_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) 327 { 328 int error; 329 struct mcpcia_config *ccp = t->_cookie; 330 331 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 332 t->_sgmap); 333 if (error == 0) 334 MCPCIA_SGTLB_INVALIDATE(ccp); 335 return (error); 336 } 337 338 /* 339 * Unload a MCPCIA DMA map. 340 */ 341 static void 342 mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 343 { 344 struct mcpcia_config *ccp = t->_cookie; 345 346 /* 347 * Invalidate any SGMAP page table entries used by this mapping. 348 */ 349 pci_sgmap_pte64_unload(t, map, t->_sgmap); 350 MCPCIA_SGTLB_INVALIDATE(ccp); 351 352 /* 353 * Do the generic bits of the unload. 354 */ 355 _bus_dmamap_unload_common(t, map); 356 } 357
Indexes created Sat Oct 25 16:10:12 GMT 2025