1 /* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: (BSD-2-Clause AND BSD-4-Clause) 5 * 6 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 11 * NASA Ames Research Center. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 37 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by Christopher G. Demetriou 50 * for the NetBSD Project. 51 * 4. The name of the author may not be used to endorse or promote products 52 * derived from this software without specific prior written permission 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 55 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 56 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 57 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 58 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 59 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 60 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 63 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66 #ifndef _BUS_DMA_H_ 67 #define _BUS_DMA_H_ 68 69 #ifdef _KERNEL 70 #include <sys/_bus_dma.h> 71 #endif 72 73 /* 74 * Machine independent interface for mapping physical addresses to peripheral 75 * bus 'physical' addresses, and assisting with DMA operations. 76 * 77 * XXX This file is always included from <machine/bus_dma.h> and should not 78 * (yet) be included directly. 79 */ 80 81 /* 82 * Flags used in various bus DMA methods. 83 */ 84 #define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */ 85 #define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */ 86 #define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */ 87 #define BUS_DMA_COHERENT 0x04 /* hint: map memory in a coherent way */ 88 #define BUS_DMA_ZERO 0x08 /* allocate zero'ed memory */ 89 #define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */ 90 #define BUS_DMA_BUS2 0x20 91 #define BUS_DMA_BUS3 0x40 92 #define BUS_DMA_BUS4 0x80 93 94 /* 95 * The following two flags are non-standard or specific to only certain 96 * architectures 97 */ 98 #define BUS_DMA_NOWRITE 0x100 99 #define BUS_DMA_NOCACHE 0x200 100 101 /* 102 * The following flag is a DMA tag hint that the page offset of the 103 * loaded kernel virtual address must be preserved in the first 104 * physical segment address, when the KVA is loaded into DMA. 105 */ 106 #define BUS_DMA_KEEP_PG_OFFSET 0x400 107 108 #define BUS_DMA_LOAD_MBUF 0x800 109 110 /* Forwards needed by prototypes below. */ 111 union ccb; 112 struct bio; 113 struct crypto_buffer; 114 struct cryptop; 115 struct mbuf; 116 struct memdesc; 117 struct pmap; 118 struct uio; 119 120 /* 121 * Operations performed by bus_dmamap_sync(). 122 */ 123 #define BUS_DMASYNC_PREREAD 1 124 #define BUS_DMASYNC_POSTREAD 2 125 #define BUS_DMASYNC_PREWRITE 4 126 #define BUS_DMASYNC_POSTWRITE 8 127 128 /* 129 * bus_dma_segment_t 130 * 131 * Describes a single contiguous DMA transaction. Values 132 * are suitable for programming into DMA registers. 133 */ 134 typedef struct bus_dma_segment { 135 bus_addr_t ds_addr; /* DMA address */ 136 bus_size_t ds_len; /* length of transfer */ 137 } bus_dma_segment_t; 138 139 #ifdef _KERNEL 140 /* 141 * A function that returns 1 if the address cannot be accessed by 142 * a device and 0 if it can be. 143 */ 144 typedef int bus_dma_filter_t(void *, bus_addr_t); 145 146 /* 147 * Generic helper function for manipulating mutexes. 148 */ 149 void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op); 150 151 /* 152 * Internal helper function used by tags that do not defer loads. 153 */ 154 void _busdma_dflt_lock(void *arg, bus_dma_lock_op_t op); 155 156 /* 157 * Allocate a device specific dma_tag encapsulating the constraints of 158 * the parent tag in addition to other restrictions specified: 159 * 160 * alignment: Alignment for segments. 161 * boundary: Boundary that segments cannot cross. 162 * lowaddr: Low restricted address that cannot appear in a mapping. 163 * highaddr: High restricted address that cannot appear in a mapping. 164 * filtfunc: (deprecated, must be NULL) 165 * filtfuncarg: (deprecated, must be NULL) 166 * maxsize: Maximum mapping size supported by this tag. 167 * nsegments: Number of discontinuities allowed in maps. 168 * maxsegsz: Maximum size of a segment in the map. 169 * flags: Bus DMA flags. 170 * lockfunc: An optional function to handle driver-defined lock 171 * operations. 172 * lockfuncarg: An argument that will be passed to lockfunc in addition 173 * to the lock operation. 174 * dmat: A pointer to set to a valid dma tag should the return 175 * value of this function indicate success. 176 */ 177 /* XXX Should probably allow specification of alignment */ 178 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 179 bus_addr_t boundary, bus_addr_t lowaddr, 180 bus_addr_t highaddr, bus_dma_filter_t *filtfunc, 181 void *filtfuncarg, bus_size_t maxsize, int nsegments, 182 bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 183 void *lockfuncarg, bus_dma_tag_t *dmat); 184 185 /* 186 * Functions for creating and cloning tags via a template, 187 * 188 * bus_dma_template_t is made avaialble publicly so it can be allocated 189 * from the caller stack. Its contents should be considered private, and 190 * should only be accessed via the documented APIs and macros 191 */ 192 typedef struct { 193 bus_dma_tag_t parent; 194 bus_size_t alignment; 195 bus_addr_t boundary; 196 bus_addr_t lowaddr; 197 bus_addr_t highaddr; 198 bus_size_t maxsize; 199 int nsegments; 200 bus_size_t maxsegsize; 201 int flags; 202 bus_dma_lock_t *lockfunc; 203 void *lockfuncarg; 204 const char *name; 205 } bus_dma_template_t; 206 207 /* 208 * These enum values should not be re-ordered. BD_PARAM_INVALID is an 209 * invalid key and will trigger a panic. 210 */ 211 typedef enum { 212 BD_PARAM_INVALID = 0, 213 BD_PARAM_PARENT = 1, 214 BD_PARAM_ALIGNMENT = 2, 215 BD_PARAM_BOUNDARY = 3, 216 BD_PARAM_LOWADDR = 4, 217 BD_PARAM_HIGHADDR = 5, 218 BD_PARAM_MAXSIZE = 6, 219 BD_PARAM_NSEGMENTS = 7, 220 BD_PARAM_MAXSEGSIZE = 8, 221 BD_PARAM_FLAGS = 9, 222 BD_PARAM_LOCKFUNC = 10, 223 BD_PARAM_LOCKFUNCARG = 11, 224 BD_PARAM_NAME = 12 225 } bus_dma_param_key_t; 226 227 /* These contents should also be considered private */ 228 typedef struct { 229 bus_dma_param_key_t key; 230 union { 231 void *ptr; 232 vm_paddr_t pa; 233 uintmax_t num; 234 }; 235 } bus_dma_param_t; 236 237 #define BD_PARENT(val) { BD_PARAM_PARENT, .ptr = val } 238 #define BD_ALIGNMENT(val) { BD_PARAM_ALIGNMENT, .num = val } 239 #define BD_BOUNDARY(val) { BD_PARAM_BOUNDARY, .num = val } 240 #define BD_LOWADDR(val) { BD_PARAM_LOWADDR, .pa = val } 241 #define BD_HIGHADDR(val) { BD_PARAM_HIGHADDR, .pa = val } 242 #define BD_MAXSIZE(val) { BD_PARAM_MAXSIZE, .num = val } 243 #define BD_NSEGMENTS(val) { BD_PARAM_NSEGMENTS, .num = val } 244 #define BD_MAXSEGSIZE(val) { BD_PARAM_MAXSEGSIZE, .num = val } 245 #define BD_FLAGS(val) { BD_PARAM_FLAGS, .num = val } 246 #define BD_LOCKFUNC(val) { BD_PARAM_LOCKFUNC, .ptr = val } 247 #define BD_LOCKFUNCARG(val) { BD_PARAM_LOCKFUNCARG, .ptr = val } 248 #define BD_NAME(val) { BD_PARAM_NAME, .ptr = val } 249 250 #define BUS_DMA_TEMPLATE_FILL(t, kv...) \ 251 do { \ 252 bus_dma_param_t pm[] = { kv }; \ 253 bus_dma_template_fill(t, pm, howmany(sizeof(pm), sizeof(pm[0]))); \ 254 } while (0) 255 256 void bus_dma_template_init(bus_dma_template_t *t, bus_dma_tag_t parent); 257 int bus_dma_template_tag(bus_dma_template_t *t, bus_dma_tag_t *dmat); 258 void bus_dma_template_clone(bus_dma_template_t *t, bus_dma_tag_t dmat); 259 void bus_dma_template_fill(bus_dma_template_t *t, bus_dma_param_t *kv, 260 u_int count); 261 262 /* 263 * Set the memory domain to be used for allocations. 264 * 265 * Automatic for PCI devices. Must be set prior to creating maps or 266 * allocating memory. 267 */ 268 int bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain); 269 270 int bus_dma_tag_destroy(bus_dma_tag_t dmat); 271 272 /* 273 * A function that processes a successfully loaded dma map or an error 274 * from a delayed load map. 275 */ 276 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); 277 278 /* 279 * Like bus_dmamap_callback but includes map size in bytes. This is 280 * defined as a separate interface to maintain compatibility for users 281 * of bus_dmamap_callback_t--at some point these interfaces should be merged. 282 */ 283 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); 284 285 /* 286 * Map the buffer buf into bus space using the dmamap map. 287 */ 288 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 289 bus_size_t buflen, bus_dmamap_callback_t *callback, 290 void *callback_arg, int flags); 291 292 /* 293 * Like bus_dmamap_load but for mbufs. Note the use of the 294 * bus_dmamap_callback2_t interface. 295 */ 296 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, 297 struct mbuf *mbuf, 298 bus_dmamap_callback2_t *callback, void *callback_arg, 299 int flags); 300 301 int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 302 struct mbuf *mbuf, bus_dma_segment_t *segs, 303 int *nsegs, int flags); 304 305 /* 306 * Like bus_dmamap_load but for uios. Note the use of the 307 * bus_dmamap_callback2_t interface. 308 */ 309 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, 310 struct uio *ui, 311 bus_dmamap_callback2_t *callback, void *callback_arg, 312 int flags); 313 314 /* 315 * Like bus_dmamap_load but for cam control blocks. 316 */ 317 int bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 318 bus_dmamap_callback_t *callback, void *callback_arg, 319 int flags); 320 321 /* 322 * Like bus_dmamap_load but for bios. 323 */ 324 int bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 325 bus_dmamap_callback_t *callback, void *callback_arg, 326 int flags); 327 328 /* 329 * Like bus_dmamap_load but for crypto ops. 330 */ 331 int bus_dmamap_load_crp(bus_dma_tag_t dmat, bus_dmamap_t map, 332 struct cryptop *crp, bus_dmamap_callback_t *callback, 333 void *callback_arg, int flags); 334 int bus_dmamap_load_crp_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, 335 struct crypto_buffer *cb, 336 bus_dmamap_callback_t *callback, 337 void *callback_arg, int flags); 338 339 /* 340 * Loads any memory descriptor. 341 */ 342 int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map, 343 struct memdesc *mem, bus_dmamap_callback_t *callback, 344 void *callback_arg, int flags); 345 346 /* 347 * Placeholder for use by busdma implementations which do not benefit 348 * from optimized procedure to load an array of vm_page_t. Falls back 349 * to do _bus_dmamap_load_phys() in loop. 350 */ 351 int bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map, 352 struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags, 353 bus_dma_segment_t *segs, int *segp); 354 355 #ifdef WANT_INLINE_DMAMAP 356 #define BUS_DMAMAP_OP static inline 357 #else 358 #define BUS_DMAMAP_OP 359 #endif 360 361 /* 362 * Allocate a handle for mapping from kva/uva/physical 363 * address space into bus device space. 364 */ 365 BUS_DMAMAP_OP int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); 366 367 /* 368 * Destroy a handle for mapping from kva/uva/physical 369 * address space into bus device space. 370 */ 371 BUS_DMAMAP_OP int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); 372 373 /* 374 * Allocate a piece of memory that can be efficiently mapped into 375 * bus device space based on the constraints listed in the dma tag. 376 * A dmamap to for use with dmamap_load is also allocated. 377 */ 378 BUS_DMAMAP_OP int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 379 bus_dmamap_t *mapp); 380 381 /* 382 * Free a piece of memory and its allocated dmamap, that was allocated 383 * via bus_dmamem_alloc. 384 */ 385 BUS_DMAMAP_OP void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); 386 387 /* 388 * Perform a synchronization operation on the given map. If the map 389 * is NULL we have a fully IO-coherent system. 390 */ 391 BUS_DMAMAP_OP void bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t dmamap, bus_dmasync_op_t op); 392 393 /* 394 * Release the mapping held by map. 395 */ 396 BUS_DMAMAP_OP void bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t dmamap); 397 398 #undef BUS_DMAMAP_OP 399 #endif /* _KERNEL */ 400 401 #endif /* _BUS_DMA_H_ */ 402