mcpcia_dma.c revision 1.23
1 /* $NetBSD: mcpcia_dma.c,v 1.23 2020/10/11 00:33:31 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 1.23 2020/10/11 00:33:31 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 #include <alpha/pci/pci_kn300.h> 51 52 bus_dma_tag_t mcpcia_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 53 54 int mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 55 bus_size_t, struct proc *, int); 56 57 int mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 58 struct mbuf *, int); 59 60 int mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct uio *, int); 62 63 int mcpcia_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 mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 67 68 /* 69 * Direct-mapped window: 2G at 2G 70 */ 71 #define MCPCIA_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 72 #define MCPCIA_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 73 74 /* 75 * SGMAP window for PCI: 1G at 1G 76 */ 77 #define MCPCIA_PCI_SG_MAPPED_BASE (1UL*1024UL*1024UL*1024UL) 78 #define MCPCIA_PCI_SG_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL) 79 80 /* 81 * SGMAP window for ISA: 8M at 8M 82 */ 83 #define MCPCIA_ISA_SG_MAPPED_BASE (8*1024*1024) 84 #define MCPCIA_ISA_SG_MAPPED_SIZE (8*1024*1024) 85 86 /* MCPCIA has a 256-byte out-bound DMA prefetch threshold. */ 87 #define MCPCIA_SG_MAPPED_PFTHRESH 256 88 89 #define MCPCIA_SGTLB_INVALIDATE(ccp) \ 90 do { \ 91 alpha_mb(); \ 92 REGVAL(MCPCIA_SG_TBIA(ccp)) = 0xdeadbeef; \ 93 alpha_mb(); \ 94 } while (0) 95 96 void 97 mcpcia_dma_init(struct mcpcia_config *ccp) 98 { 99 bus_dma_tag_t t; 100 101 /* 102 * Initialize the DMA tag used for direct-mapped DMA. 103 */ 104 t = &ccp->cc_dmat_direct; 105 t->_cookie = ccp; 106 t->_wbase = MCPCIA_DIRECT_MAPPED_BASE; 107 t->_wsize = MCPCIA_DIRECT_MAPPED_SIZE; 108 t->_next_window = &ccp->cc_dmat_pci_sgmap; 109 t->_boundary = 0; 110 t->_sgmap = NULL; 111 t->_get_tag = mcpcia_dma_get_tag; 112 t->_dmamap_create = _bus_dmamap_create; 113 t->_dmamap_destroy = _bus_dmamap_destroy; 114 t->_dmamap_load = _bus_dmamap_load_direct; 115 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 116 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 117 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 118 t->_dmamap_unload = _bus_dmamap_unload; 119 t->_dmamap_sync = _bus_dmamap_sync; 120 121 t->_dmamem_alloc = _bus_dmamem_alloc; 122 t->_dmamem_free = _bus_dmamem_free; 123 t->_dmamem_map = _bus_dmamem_map; 124 t->_dmamem_unmap = _bus_dmamem_unmap; 125 t->_dmamem_mmap = _bus_dmamem_mmap; 126 127 /* 128 * Initialize the DMA tag used for sgmap-mapped PCI DMA. 129 */ 130 t = &ccp->cc_dmat_pci_sgmap; 131 t->_cookie = ccp; 132 t->_wbase = MCPCIA_PCI_SG_MAPPED_BASE; 133 t->_wsize = MCPCIA_PCI_SG_MAPPED_SIZE; 134 t->_next_window = NULL; 135 t->_boundary = 0; 136 t->_sgmap = &ccp->cc_pci_sgmap; 137 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH; 138 t->_get_tag = mcpcia_dma_get_tag; 139 t->_dmamap_create = alpha_sgmap_dmamap_create; 140 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 141 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 142 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 143 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 144 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 145 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 146 t->_dmamap_sync = _bus_dmamap_sync; 147 148 t->_dmamem_alloc = _bus_dmamem_alloc; 149 t->_dmamem_free = _bus_dmamem_free; 150 t->_dmamem_map = _bus_dmamem_map; 151 t->_dmamem_unmap = _bus_dmamem_unmap; 152 t->_dmamem_mmap = _bus_dmamem_mmap; 153 154 /* 155 * Initialize the DMA tag used for sgmap-mapped ISA DMA. 156 */ 157 t = &ccp->cc_dmat_isa_sgmap; 158 t->_cookie = ccp; 159 t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE; 160 t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE; 161 t->_next_window = NULL; 162 t->_boundary = 0; 163 t->_sgmap = &ccp->cc_isa_sgmap; 164 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH; 165 t->_get_tag = mcpcia_dma_get_tag; 166 t->_dmamap_create = alpha_sgmap_dmamap_create; 167 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 168 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap; 169 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap; 170 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap; 171 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap; 172 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap; 173 t->_dmamap_sync = _bus_dmamap_sync; 174 175 t->_dmamem_alloc = _bus_dmamem_alloc; 176 t->_dmamem_free = _bus_dmamem_free; 177 t->_dmamem_map = _bus_dmamem_map; 178 t->_dmamem_unmap = _bus_dmamem_unmap; 179 t->_dmamem_mmap = _bus_dmamem_mmap; 180 181 /* 182 * Initialize the SGMAPs. 183 */ 184 alpha_sgmap_init(&ccp->cc_dmat_pci_sgmap, &ccp->cc_pci_sgmap, 185 "mcpcia pci sgmap", 186 MCPCIA_PCI_SG_MAPPED_BASE, 0, MCPCIA_PCI_SG_MAPPED_SIZE, 187 sizeof(uint64_t), NULL, 0); 188 189 alpha_sgmap_init(&ccp->cc_dmat_isa_sgmap, &ccp->cc_isa_sgmap, 190 "mcpcia isa sgmap", 191 MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE, 192 sizeof(uint64_t), NULL, 0); 193 194 /* 195 * Disable windows first. 196 */ 197 198 REGVAL(MCPCIA_W0_BASE(ccp)) = 0; 199 REGVAL(MCPCIA_W1_BASE(ccp)) = 0; 200 REGVAL(MCPCIA_W2_BASE(ccp)) = 0; 201 REGVAL(MCPCIA_W3_BASE(ccp)) = 0; 202 REGVAL(MCPCIA_T0_BASE(ccp)) = 0; 203 REGVAL(MCPCIA_T1_BASE(ccp)) = 0; 204 REGVAL(MCPCIA_T2_BASE(ccp)) = 0; 205 REGVAL(MCPCIA_T3_BASE(ccp)) = 0; 206 alpha_mb(); 207 208 /* 209 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB. 210 */ 211 REGVAL(MCPCIA_W0_MASK(ccp)) = MCPCIA_WMASK_8M; 212 REGVAL(MCPCIA_T0_BASE(ccp)) = 213 ccp->cc_isa_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 214 alpha_mb(); 215 REGVAL(MCPCIA_W0_BASE(ccp)) = 216 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE; 217 alpha_mb(); 218 219 MCPCIA_SGTLB_INVALIDATE(ccp); 220 221 /* 222 * Set up window 1 as a 2 GB Direct-mapped window starting at 2GB. 223 */ 224 225 REGVAL(MCPCIA_W1_MASK(ccp)) = MCPCIA_WMASK_2G; 226 REGVAL(MCPCIA_T1_BASE(ccp)) = 0; 227 alpha_mb(); 228 REGVAL(MCPCIA_W1_BASE(ccp)) = 229 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN; 230 alpha_mb(); 231 232 /* 233 * Set up window 2 as a 1G SGMAP-mapped window starting at 1G. 234 */ 235 236 REGVAL(MCPCIA_W2_MASK(ccp)) = MCPCIA_WMASK_1G; 237 REGVAL(MCPCIA_T2_BASE(ccp)) = 238 ccp->cc_pci_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT; 239 alpha_mb(); 240 REGVAL(MCPCIA_W2_BASE(ccp)) = 241 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_PCI_SG_MAPPED_BASE; 242 alpha_mb(); 243 } 244 245 /* 246 * Return the bus dma tag to be used for the specified bus type. 247 * INTERNAL USE ONLY! 248 */ 249 bus_dma_tag_t 250 mcpcia_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 251 { 252 struct mcpcia_config *ccp = t->_cookie; 253 254 switch (bustype) { 255 case ALPHA_BUS_PCI: 256 case ALPHA_BUS_EISA: 257 /* 258 * Start off using the direct-mapped window. We will 259 * automatically fall backed onto the chained PCI SGMAP 260 * window if necessary. 261 */ 262 return (&ccp->cc_dmat_direct); 263 264 case ALPHA_BUS_ISA: 265 /* 266 * ISA doesn't have enough address bits to use 267 * the direct-mapped DMA window, so we must use 268 * SGMAPs. 269 */ 270 return (&ccp->cc_dmat_isa_sgmap); 271 272 default: 273 panic("mcpcia_dma_get_tag: shouldn't be here, really..."); 274 } 275 } 276 277 /* 278 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer. 279 */ 280 int 281 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) 282 { 283 int error; 284 struct mcpcia_config *ccp = t->_cookie; 285 286 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 287 t->_sgmap); 288 if (error == 0) 289 MCPCIA_SGTLB_INVALIDATE(ccp); 290 return (error); 291 } 292 293 /* 294 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain. 295 */ 296 int 297 mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 298 { 299 int error; 300 struct mcpcia_config *ccp = t->_cookie; 301 302 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 303 if (error == 0) 304 MCPCIA_SGTLB_INVALIDATE(ccp); 305 return (error); 306 } 307 308 /* 309 * Load a MCPCIA SGMAP-mapped DMA map with a uio. 310 */ 311 int 312 mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 313 { 314 int error; 315 struct mcpcia_config *ccp = t->_cookie; 316 317 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 318 if (error == 0) 319 MCPCIA_SGTLB_INVALIDATE(ccp); 320 return (error); 321 } 322 323 /* 324 * Load a MCPCIA SGMAP-mapped DMA map with raw memory. 325 */ 326 int 327 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) 328 { 329 int error; 330 struct mcpcia_config *ccp = t->_cookie; 331 332 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 333 t->_sgmap); 334 if (error == 0) 335 MCPCIA_SGTLB_INVALIDATE(ccp); 336 return (error); 337 } 338 339 /* 340 * Unload a MCPCIA DMA map. 341 */ 342 void 343 mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 344 { 345 struct mcpcia_config *ccp = t->_cookie; 346 347 /* 348 * Invalidate any SGMAP page table entries used by this mapping. 349 */ 350 pci_sgmap_pte64_unload(t, map, t->_sgmap); 351 MCPCIA_SGTLB_INVALIDATE(ccp); 352 353 /* 354 * Do the generic bits of the unload. 355 */ 356 _bus_dmamap_unload_common(t, map); 357 } 358
Indexes created Tue Sep 30 11:09:46 GMT 2025