bus_defs.h revision 1.3
1 /* $NetBSD: bus_defs.h,v 1.3 2012/02/06 02:14:13 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2000, 2001 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 /* 34 * Copyright (c) 1996 Carnegie-Mellon University. 35 * All rights reserved. 36 * 37 * Author: Chris G. Demetriou 38 * 39 * Permission to use, copy, modify and distribute this software and 40 * its documentation is hereby granted, provided that both the copyright 41 * notice and this permission notice appear in all copies of the 42 * software, derivative works or modified versions, and any portions 43 * thereof, and that both notices appear in supporting documentation. 44 * 45 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 46 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 47 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 48 * 49 * Carnegie Mellon requests users of this software to return to 50 * 51 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 52 * School of Computer Science 53 * Carnegie Mellon University 54 * Pittsburgh PA 15213-3890 55 * 56 * any improvements or extensions that they make and grant Carnegie the 57 * rights to redistribute these changes. 58 */ 59 60 #ifndef _ALPHA_BUS_DEFS_H_ 61 #define _ALPHA_BUS_DEFS_H_ 62 63 #include <sys/types.h> 64 #include <machine/bus_user.h> 65 66 #if !defined(_KERNEL) && !defined(_STANDALONE) 67 #include <stdbool.h> 68 #endif 69 #include <sys/stdint.h> 70 71 #ifdef _KERNEL 72 73 /* 74 * Turn on BUS_SPACE_DEBUG if the global DEBUG option is enabled. 75 */ 76 #if defined(DEBUG) && !defined(BUS_SPACE_DEBUG) 77 #define BUS_SPACE_DEBUG 78 #endif 79 80 #ifdef BUS_SPACE_DEBUG 81 #include <sys/systm.h> /* for printf() prototype */ 82 /* 83 * Macros for checking the aligned-ness of pointers passed to bus 84 * space ops. Strict alignment is required by the Alpha architecture, 85 * and a trap will occur if unaligned access is performed. These 86 * may aid in the debugging of a broken device driver by displaying 87 * useful information about the problem. 88 */ 89 #define __BUS_SPACE_ALIGNED_ADDRESS(p, t) \ 90 ((((u_long)(p)) & (sizeof(t)-1)) == 0) 91 92 #define __BUS_SPACE_ADDRESS_SANITY(p, t, d) \ 93 ({ \ 94 if (__BUS_SPACE_ALIGNED_ADDRESS((p), t) == 0) { \ 95 printf("%s 0x%lx not aligned to %lu bytes %s:%d\n", \ 96 d, (u_long)(p), sizeof(t), __FILE__, __LINE__); \ 97 } \ 98 (void) 0; \ 99 }) 100 101 #define BUS_SPACE_ALIGNED_POINTER(p, t) __BUS_SPACE_ALIGNED_ADDRESS(p, t) 102 #else 103 #define __BUS_SPACE_ADDRESS_SANITY(p, t, d) (void) 0 104 #define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t) 105 #endif /* BUS_SPACE_DEBUG */ 106 #endif /* _KERNEL */ 107 108 struct alpha_bus_space_translation; 109 110 /* 111 * Access methods for bus space. 112 */ 113 typedef struct alpha_bus_space *bus_space_tag_t; 114 typedef u_long bus_space_handle_t; 115 116 struct alpha_bus_space { 117 /* cookie */ 118 void *abs_cookie; 119 120 /* mapping/unmapping */ 121 int (*abs_map)(void *, bus_addr_t, bus_size_t, 122 int, bus_space_handle_t *, int); 123 void (*abs_unmap)(void *, bus_space_handle_t, 124 bus_size_t, int); 125 int (*abs_subregion)(void *, bus_space_handle_t, 126 bus_size_t, bus_size_t, bus_space_handle_t *); 127 128 /* ALPHA SPECIFIC MAPPING METHOD */ 129 int (*abs_translate)(void *, bus_addr_t, bus_size_t, 130 int, struct alpha_bus_space_translation *); 131 int (*abs_get_window)(void *, int, 132 struct alpha_bus_space_translation *); 133 134 /* allocation/deallocation */ 135 int (*abs_alloc)(void *, bus_addr_t, bus_addr_t, 136 bus_size_t, bus_size_t, bus_size_t, int, 137 bus_addr_t *, bus_space_handle_t *); 138 void (*abs_free)(void *, bus_space_handle_t, 139 bus_size_t); 140 141 /* get kernel virtual address */ 142 void * (*abs_vaddr)(void *, bus_space_handle_t); 143 144 /* mmap bus space for user */ 145 paddr_t (*abs_mmap)(void *, bus_addr_t, off_t, int, int); 146 147 /* barrier */ 148 void (*abs_barrier)(void *, bus_space_handle_t, 149 bus_size_t, bus_size_t, int); 150 151 /* read (single) */ 152 uint8_t (*abs_r_1)(void *, bus_space_handle_t, 153 bus_size_t); 154 uint16_t (*abs_r_2)(void *, bus_space_handle_t, 155 bus_size_t); 156 uint32_t (*abs_r_4)(void *, bus_space_handle_t, 157 bus_size_t); 158 uint64_t (*abs_r_8)(void *, bus_space_handle_t, 159 bus_size_t); 160 161 /* read multiple */ 162 void (*abs_rm_1)(void *, bus_space_handle_t, 163 bus_size_t, uint8_t *, bus_size_t); 164 void (*abs_rm_2)(void *, bus_space_handle_t, 165 bus_size_t, uint16_t *, bus_size_t); 166 void (*abs_rm_4)(void *, bus_space_handle_t, 167 bus_size_t, uint32_t *, bus_size_t); 168 void (*abs_rm_8)(void *, bus_space_handle_t, 169 bus_size_t, uint64_t *, bus_size_t); 170 171 /* read region */ 172 void (*abs_rr_1)(void *, bus_space_handle_t, 173 bus_size_t, uint8_t *, bus_size_t); 174 void (*abs_rr_2)(void *, bus_space_handle_t, 175 bus_size_t, uint16_t *, bus_size_t); 176 void (*abs_rr_4)(void *, bus_space_handle_t, 177 bus_size_t, uint32_t *, bus_size_t); 178 void (*abs_rr_8)(void *, bus_space_handle_t, 179 bus_size_t, uint64_t *, bus_size_t); 180 181 /* write (single) */ 182 void (*abs_w_1)(void *, bus_space_handle_t, 183 bus_size_t, uint8_t); 184 void (*abs_w_2)(void *, bus_space_handle_t, 185 bus_size_t, uint16_t); 186 void (*abs_w_4)(void *, bus_space_handle_t, 187 bus_size_t, uint32_t); 188 void (*abs_w_8)(void *, bus_space_handle_t, 189 bus_size_t, uint64_t); 190 191 /* write multiple */ 192 void (*abs_wm_1)(void *, bus_space_handle_t, 193 bus_size_t, const uint8_t *, bus_size_t); 194 void (*abs_wm_2)(void *, bus_space_handle_t, 195 bus_size_t, const uint16_t *, bus_size_t); 196 void (*abs_wm_4)(void *, bus_space_handle_t, 197 bus_size_t, const uint32_t *, bus_size_t); 198 void (*abs_wm_8)(void *, bus_space_handle_t, 199 bus_size_t, const uint64_t *, bus_size_t); 200 201 /* write region */ 202 void (*abs_wr_1)(void *, bus_space_handle_t, 203 bus_size_t, const uint8_t *, bus_size_t); 204 void (*abs_wr_2)(void *, bus_space_handle_t, 205 bus_size_t, const uint16_t *, bus_size_t); 206 void (*abs_wr_4)(void *, bus_space_handle_t, 207 bus_size_t, const uint32_t *, bus_size_t); 208 void (*abs_wr_8)(void *, bus_space_handle_t, 209 bus_size_t, const uint64_t *, bus_size_t); 210 211 /* set multiple */ 212 void (*abs_sm_1)(void *, bus_space_handle_t, 213 bus_size_t, uint8_t, bus_size_t); 214 void (*abs_sm_2)(void *, bus_space_handle_t, 215 bus_size_t, uint16_t, bus_size_t); 216 void (*abs_sm_4)(void *, bus_space_handle_t, 217 bus_size_t, uint32_t, bus_size_t); 218 void (*abs_sm_8)(void *, bus_space_handle_t, 219 bus_size_t, uint64_t, bus_size_t); 220 221 /* set region */ 222 void (*abs_sr_1)(void *, bus_space_handle_t, 223 bus_size_t, uint8_t, bus_size_t); 224 void (*abs_sr_2)(void *, bus_space_handle_t, 225 bus_size_t, uint16_t, bus_size_t); 226 void (*abs_sr_4)(void *, bus_space_handle_t, 227 bus_size_t, uint32_t, bus_size_t); 228 void (*abs_sr_8)(void *, bus_space_handle_t, 229 bus_size_t, uint64_t, bus_size_t); 230 231 /* copy */ 232 void (*abs_c_1)(void *, bus_space_handle_t, bus_size_t, 233 bus_space_handle_t, bus_size_t, bus_size_t); 234 void (*abs_c_2)(void *, bus_space_handle_t, bus_size_t, 235 bus_space_handle_t, bus_size_t, bus_size_t); 236 void (*abs_c_4)(void *, bus_space_handle_t, bus_size_t, 237 bus_space_handle_t, bus_size_t, bus_size_t); 238 void (*abs_c_8)(void *, bus_space_handle_t, bus_size_t, 239 bus_space_handle_t, bus_size_t, bus_size_t); 240 }; 241 242 #define BUS_SPACE_MAP_CACHEABLE 0x01 243 244 #ifdef _KERNEL 245 246 #define BUS_SPACE_BARRIER_READ 0x01 247 #define BUS_SPACE_BARRIER_WRITE 0x02 248 /* 249 * Bus stream operations--defined in terms of non-stream counterparts 250 */ 251 #define __BUS_SPACE_HAS_STREAM_METHODS 1 252 253 /* 254 * Flags used in various bus DMA methods. 255 */ 256 #define BUS_DMA_WAITOK 0x000 /* safe to sleep (pseudo-flag) */ 257 #define BUS_DMA_NOWAIT 0x001 /* not safe to sleep */ 258 #define BUS_DMA_ALLOCNOW 0x002 /* perform resource allocation now */ 259 #define BUS_DMA_COHERENT 0x004 /* hint: map memory DMA coherent */ 260 #define BUS_DMA_STREAMING 0x008 /* hint: sequential, unidirectional */ 261 #define BUS_DMA_BUS1 0x010 /* placeholders for bus functions... */ 262 #define BUS_DMA_BUS2 0x020 263 #define BUS_DMA_BUS3 0x040 264 #define BUS_DMA_BUS4 0x080 265 #define BUS_DMA_READ 0x100 /* mapping is device -> memory only */ 266 #define BUS_DMA_WRITE 0x200 /* mapping is memory -> device only */ 267 #define BUS_DMA_NOCACHE 0x400 /* hint: map non-cached memory */ 268 269 /* 270 * Private flags stored in the DMA map. 271 */ 272 #define DMAMAP_NO_COALESCE 0x40000000 /* don't coalesce adjacent 273 segments */ 274 275 /* Forwards needed by prototypes below. */ 276 struct mbuf; 277 struct uio; 278 struct alpha_sgmap; 279 280 /* 281 * Operations performed by bus_dmamap_sync(). 282 */ 283 #define BUS_DMASYNC_PREREAD 0x01 /* pre-read synchronization */ 284 #define BUS_DMASYNC_POSTREAD 0x02 /* post-read synchronization */ 285 #define BUS_DMASYNC_PREWRITE 0x04 /* pre-write synchronization */ 286 #define BUS_DMASYNC_POSTWRITE 0x08 /* post-write synchronization */ 287 288 /* 289 * alpha_bus_t 290 * 291 * Busses supported by NetBSD/alpha, used by internal 292 * utility functions. NOT TO BE USED BY MACHINE-INDEPENDENT 293 * CODE! 294 */ 295 typedef enum { 296 ALPHA_BUS_TURBOCHANNEL, 297 ALPHA_BUS_PCI, 298 ALPHA_BUS_EISA, 299 ALPHA_BUS_ISA, 300 ALPHA_BUS_TLSB, 301 } alpha_bus_t; 302 303 typedef struct alpha_bus_dma_tag *bus_dma_tag_t; 304 typedef struct alpha_bus_dmamap *bus_dmamap_t; 305 306 #define BUS_DMA_TAG_VALID(t) ((t) != (bus_dma_tag_t)0) 307 308 /* 309 * bus_dma_segment_t 310 * 311 * Describes a single contiguous DMA transaction. Values 312 * are suitable for programming into DMA registers. 313 */ 314 struct alpha_bus_dma_segment { 315 bus_addr_t ds_addr; /* DMA address */ 316 bus_size_t ds_len; /* length of transfer */ 317 }; 318 typedef struct alpha_bus_dma_segment bus_dma_segment_t; 319 320 /* 321 * bus_dma_tag_t 322 * 323 * A machine-dependent opaque type describing the implementation of 324 * DMA for a given bus. 325 */ 326 struct alpha_bus_dma_tag { 327 void *_cookie; /* cookie used in the guts */ 328 bus_addr_t _wbase; /* DMA window base */ 329 330 /* 331 * The following two members are used to chain DMA windows 332 * together. If, during the course of a map load, the 333 * resulting physical memory address is too large to 334 * be addressed by the window, the next window will be 335 * attempted. These would be chained together like so: 336 * 337 * direct -> sgmap -> NULL 338 * or 339 * sgmap -> NULL 340 * or 341 * direct -> NULL 342 * 343 * If the window size is 0, it will not be checked (e.g. 344 * TurboChannel DMA). 345 */ 346 bus_size_t _wsize; 347 struct alpha_bus_dma_tag *_next_window; 348 349 /* 350 * Some chipsets have a built-in boundary constraint, independent 351 * of what the device requests. This allows that boundary to 352 * be specified. If the device has a more restrictive constraint, 353 * the map will use that, otherwise this boundary will be used. 354 * This value is ignored if 0. 355 */ 356 bus_size_t _boundary; 357 358 /* 359 * A chipset may have more than one SGMAP window, so SGMAP 360 * windows also get a pointer to their SGMAP state. 361 */ 362 struct alpha_sgmap *_sgmap; 363 364 /* 365 * The SGMAP MMU implements a prefetch FIFO to keep data 366 * moving down the pipe, when doing host->bus DMA writes. 367 * The threshold (distance until the next page) used to 368 * trigger the prefetch is differnet on different chipsets, 369 * and we need to know what it is in order to know whether 370 * or not to allocate a spill page. 371 */ 372 bus_size_t _pfthresh; 373 374 /* 375 * Internal-use only utility methods. NOT TO BE USED BY 376 * MACHINE-INDEPENDENT CODE! 377 */ 378 bus_dma_tag_t (*_get_tag)(bus_dma_tag_t, alpha_bus_t); 379 380 /* 381 * DMA mapping methods. 382 */ 383 int (*_dmamap_create)(bus_dma_tag_t, bus_size_t, int, 384 bus_size_t, bus_size_t, int, bus_dmamap_t *); 385 void (*_dmamap_destroy)(bus_dma_tag_t, bus_dmamap_t); 386 int (*_dmamap_load)(bus_dma_tag_t, bus_dmamap_t, void *, 387 bus_size_t, struct proc *, int); 388 int (*_dmamap_load_mbuf)(bus_dma_tag_t, bus_dmamap_t, 389 struct mbuf *, int); 390 int (*_dmamap_load_uio)(bus_dma_tag_t, bus_dmamap_t, 391 struct uio *, int); 392 int (*_dmamap_load_raw)(bus_dma_tag_t, bus_dmamap_t, 393 bus_dma_segment_t *, int, bus_size_t, int); 394 void (*_dmamap_unload)(bus_dma_tag_t, bus_dmamap_t); 395 void (*_dmamap_sync)(bus_dma_tag_t, bus_dmamap_t, 396 bus_addr_t, bus_size_t, int); 397 398 /* 399 * DMA memory utility functions. 400 */ 401 int (*_dmamem_alloc)(bus_dma_tag_t, bus_size_t, bus_size_t, 402 bus_size_t, bus_dma_segment_t *, int, int *, int); 403 void (*_dmamem_free)(bus_dma_tag_t, 404 bus_dma_segment_t *, int); 405 int (*_dmamem_map)(bus_dma_tag_t, bus_dma_segment_t *, 406 int, size_t, void **, int); 407 void (*_dmamem_unmap)(bus_dma_tag_t, void *, size_t); 408 paddr_t (*_dmamem_mmap)(bus_dma_tag_t, bus_dma_segment_t *, 409 int, off_t, int, int); 410 }; 411 412 #define alphabus_dma_get_tag(t, b) \ 413 (*(t)->_get_tag)(t, b) 414 415 /* 416 * bus_dmamap_t 417 * 418 * Describes a DMA mapping. 419 */ 420 struct alpha_bus_dmamap { 421 /* 422 * PRIVATE MEMBERS: not for use my machine-independent code. 423 */ 424 bus_size_t _dm_size; /* largest DMA transfer mappable */ 425 int _dm_segcnt; /* number of segs this map can map */ 426 bus_size_t _dm_maxmaxsegsz; /* fixed largest possible segment */ 427 bus_size_t _dm_boundary; /* don't cross this */ 428 int _dm_flags; /* misc. flags */ 429 430 /* 431 * Private cookie to be used by the DMA back-end. 432 */ 433 void *_dm_cookie; 434 435 /* 436 * The DMA window that we ended up being mapped in. 437 */ 438 bus_dma_tag_t _dm_window; 439 440 /* 441 * PUBLIC MEMBERS: these are used by machine-independent code. 442 */ 443 bus_size_t dm_maxsegsz; /* largest possible segment */ 444 bus_size_t dm_mapsize; /* size of the mapping */ 445 int dm_nsegs; /* # valid segments in mapping */ 446 bus_dma_segment_t dm_segs[1]; /* segments; variable length */ 447 }; 448 449 #endif /* _KERNEL */ 450 451 #endif /* _ALPHA_BUS_DEFS_H_ */ 452
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