busdma_machdep-v4.c revision 143671
1139735Simp/*- 2129198Scognet * Copyright (c) 2004 Olivier Houchard 3129198Scognet * Copyright (c) 2002 Peter Grehan 4129198Scognet * Copyright (c) 1997, 1998 Justin T. Gibbs. 5129198Scognet * All rights reserved. 6129198Scognet * 7129198Scognet * Redistribution and use in source and binary forms, with or without 8129198Scognet * modification, are permitted provided that the following conditions 9129198Scognet * are met: 10129198Scognet * 1. Redistributions of source code must retain the above copyright 11129198Scognet * notice, this list of conditions, and the following disclaimer, 12129198Scognet * without modification, immediately at the beginning of the file. 13129198Scognet * 2. The name of the author may not be used to endorse or promote products 14129198Scognet * derived from this software without specific prior written permission. 15129198Scognet * 16129198Scognet * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17129198Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18129198Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19129198Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20129198Scognet * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21129198Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22129198Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23129198Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24129198Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25129198Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26129198Scognet * SUCH DAMAGE. 27129198Scognet * 28129198Scognet * From i386/busdma_machdep.c,v 1.26 2002/04/19 22:58:09 alfred 29129198Scognet */ 30129198Scognet 31129198Scognet#include <sys/cdefs.h> 32129198Scognet__FBSDID("$FreeBSD: head/sys/arm/arm/busdma_machdep.c 143671 2005-03-16 00:35:59Z jmg $"); 33129198Scognet 34129198Scognet/* 35129198Scognet * MacPPC bus dma support routines 36129198Scognet */ 37129198Scognet 38129198Scognet#define _ARM32_BUS_DMA_PRIVATE 39129198Scognet#include <sys/param.h> 40129198Scognet#include <sys/systm.h> 41129198Scognet#include <sys/malloc.h> 42129198Scognet#include <sys/bus.h> 43129198Scognet#include <sys/interrupt.h> 44129198Scognet#include <sys/lock.h> 45129198Scognet#include <sys/proc.h> 46129198Scognet#include <sys/mutex.h> 47129198Scognet#include <sys/mbuf.h> 48129198Scognet#include <sys/uio.h> 49140310Scognet#include <sys/ktr.h> 50129198Scognet 51129198Scognet#include <vm/vm.h> 52129198Scognet#include <vm/vm_page.h> 53129198Scognet#include <vm/vm_map.h> 54129198Scognet 55129198Scognet#include <machine/atomic.h> 56129198Scognet#include <machine/bus.h> 57129198Scognet#include <machine/cpufunc.h> 58129198Scognet 59129198Scognetstruct bus_dma_tag { 60129198Scognet bus_dma_tag_t parent; 61129198Scognet bus_size_t alignment; 62129198Scognet bus_size_t boundary; 63129198Scognet bus_addr_t lowaddr; 64129198Scognet bus_addr_t highaddr; 65129198Scognet bus_dma_filter_t *filter; 66129198Scognet void *filterarg; 67129198Scognet bus_size_t maxsize; 68129198Scognet u_int nsegments; 69129198Scognet bus_size_t maxsegsz; 70129198Scognet int flags; 71129198Scognet int ref_count; 72129198Scognet int map_count; 73129198Scognet bus_dma_lock_t *lockfunc; 74129198Scognet void *lockfuncarg; 75129198Scognet /* 76129198Scognet * DMA range for this tag. If the page doesn't fall within 77129198Scognet * one of these ranges, an error is returned. The caller 78129198Scognet * may then decide what to do with the transfer. If the 79129198Scognet * range pointer is NULL, it is ignored. 80129198Scognet */ 81129198Scognet struct arm32_dma_range *ranges; 82129198Scognet int _nranges; 83129198Scognet}; 84129198Scognet 85135644Scognet#define DMAMAP_LINEAR 0x1 86135644Scognet#define DMAMAP_MBUF 0x2 87135644Scognet#define DMAMAP_UIO 0x4 88135644Scognet#define DMAMAP_TYPE_MASK (DMAMAP_LINEAR|DMAMAP_MBUF|DMAMAP_UIO) 89135644Scognet#define DMAMAP_COHERENT 0x8 90129198Scognetstruct bus_dmamap { 91135644Scognet bus_dma_tag_t dmat; 92135644Scognet int flags; 93135644Scognet void *buffer; 94135644Scognet int len; 95129198Scognet}; 96129198Scognet 97129198Scognet/* 98129198Scognet * Check to see if the specified page is in an allowed DMA range. 99129198Scognet */ 100129198Scognet 101137758Scognetstatic __inline int 102140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 103137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 104137760Scognet int flags, vm_offset_t *lastaddrp, int *segp); 105135644Scognet 106129198Scognetstatic __inline struct arm32_dma_range * 107129198Scognet_bus_dma_inrange(struct arm32_dma_range *ranges, int nranges, 108129198Scognet bus_addr_t curaddr) 109129198Scognet{ 110129198Scognet struct arm32_dma_range *dr; 111129198Scognet int i; 112129198Scognet 113129198Scognet for (i = 0, dr = ranges; i < nranges; i++, dr++) { 114129198Scognet if (curaddr >= dr->dr_sysbase && 115129198Scognet round_page(curaddr) <= (dr->dr_sysbase + dr->dr_len)) 116129198Scognet return (dr); 117129198Scognet } 118129198Scognet 119129198Scognet return (NULL); 120129198Scognet} 121129198Scognet/* 122129198Scognet * Convenience function for manipulating driver locks from busdma (during 123129198Scognet * busdma_swi, for example). Drivers that don't provide their own locks 124129198Scognet * should specify &Giant to dmat->lockfuncarg. Drivers that use their own 125129198Scognet * non-mutex locking scheme don't have to use this at all. 126129198Scognet */ 127129198Scognetvoid 128129198Scognetbusdma_lock_mutex(void *arg, bus_dma_lock_op_t op) 129129198Scognet{ 130129198Scognet struct mtx *dmtx; 131129198Scognet 132129198Scognet dmtx = (struct mtx *)arg; 133129198Scognet switch (op) { 134129198Scognet case BUS_DMA_LOCK: 135129198Scognet mtx_lock(dmtx); 136129198Scognet break; 137129198Scognet case BUS_DMA_UNLOCK: 138129198Scognet mtx_unlock(dmtx); 139129198Scognet break; 140129198Scognet default: 141129198Scognet panic("Unknown operation 0x%x for busdma_lock_mutex!", op); 142129198Scognet } 143129198Scognet} 144129198Scognet 145129198Scognet/* 146129198Scognet * dflt_lock should never get called. It gets put into the dma tag when 147129198Scognet * lockfunc == NULL, which is only valid if the maps that are associated 148129198Scognet * with the tag are meant to never be defered. 149129198Scognet * XXX Should have a way to identify which driver is responsible here. 150129198Scognet */ 151129198Scognetstatic void 152129198Scognetdflt_lock(void *arg, bus_dma_lock_op_t op) 153129198Scognet{ 154129198Scognet#ifdef INVARIANTS 155129198Scognet panic("driver error: busdma dflt_lock called"); 156129198Scognet#else 157129198Scognet printf("DRIVER_ERROR: busdma dflt_lock called\n"); 158129198Scognet#endif 159129198Scognet} 160129198Scognet 161129198Scognet/* 162129198Scognet * Allocate a device specific dma_tag. 163129198Scognet */ 164135644Scognet#define SEG_NB 1024 165135644Scognet 166129198Scognetint 167129198Scognetbus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 168129198Scognet bus_size_t boundary, bus_addr_t lowaddr, 169129198Scognet bus_addr_t highaddr, bus_dma_filter_t *filter, 170129198Scognet void *filterarg, bus_size_t maxsize, int nsegments, 171129198Scognet bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 172129198Scognet void *lockfuncarg, bus_dma_tag_t *dmat) 173129198Scognet{ 174129198Scognet bus_dma_tag_t newtag; 175129198Scognet int error = 0; 176129198Scognet /* Return a NULL tag on failure */ 177129198Scognet *dmat = NULL; 178129198Scognet 179129198Scognet newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT); 180140313Scognet if (newtag == NULL) { 181143294Smux CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 182143284Smux __func__, newtag, 0, error); 183129198Scognet return (ENOMEM); 184140313Scognet } 185129198Scognet 186129198Scognet newtag->parent = parent; 187129198Scognet newtag->alignment = alignment; 188129198Scognet newtag->boundary = boundary; 189129198Scognet newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1); 190129198Scognet newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1); 191129198Scognet newtag->filter = filter; 192129198Scognet newtag->filterarg = filterarg; 193129198Scognet newtag->maxsize = maxsize; 194129198Scognet newtag->nsegments = nsegments; 195129198Scognet newtag->maxsegsz = maxsegsz; 196129198Scognet newtag->flags = flags; 197129198Scognet newtag->ref_count = 1; /* Count ourself */ 198129198Scognet newtag->map_count = 0; 199129198Scognet newtag->ranges = bus_dma_get_range(); 200135644Scognet newtag->_nranges = bus_dma_get_range_nb(); 201129198Scognet if (lockfunc != NULL) { 202129198Scognet newtag->lockfunc = lockfunc; 203129198Scognet newtag->lockfuncarg = lockfuncarg; 204129198Scognet } else { 205129198Scognet newtag->lockfunc = dflt_lock; 206129198Scognet newtag->lockfuncarg = NULL; 207129198Scognet } 208129198Scognet /* 209129198Scognet * Take into account any restrictions imposed by our parent tag 210129198Scognet */ 211129198Scognet if (parent != NULL) { 212129198Scognet newtag->lowaddr = min(parent->lowaddr, newtag->lowaddr); 213129198Scognet newtag->highaddr = max(parent->highaddr, newtag->highaddr); 214134934Sscottl if (newtag->boundary == 0) 215134934Sscottl newtag->boundary = parent->boundary; 216134934Sscottl else if (parent->boundary != 0) 217134934Sscottl newtag->boundary = min(parent->boundary, 218134934Sscottl newtag->boundary); 219129198Scognet if (newtag->filter == NULL) { 220129198Scognet /* 221129198Scognet * Short circuit looking at our parent directly 222129198Scognet * since we have encapsulated all of its information 223129198Scognet */ 224129198Scognet newtag->filter = parent->filter; 225129198Scognet newtag->filterarg = parent->filterarg; 226129198Scognet newtag->parent = parent->parent; 227129198Scognet } 228129198Scognet if (newtag->parent != NULL) 229129198Scognet atomic_add_int(&parent->ref_count, 1); 230129198Scognet } 231129198Scognet 232129198Scognet *dmat = newtag; 233143294Smux CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 234143284Smux __func__, newtag, (newtag != NULL ? newtag->flags : 0), error); 235140313Scognet 236129198Scognet return (error); 237129198Scognet} 238129198Scognet 239129198Scognetint 240129198Scognetbus_dma_tag_destroy(bus_dma_tag_t dmat) 241129198Scognet{ 242140680Scognet#ifdef KTR 243140313Scognet bus_dma_tag_t dmat_copy = dmat; 244140680Scognet#endif 245140313Scognet 246129198Scognet if (dmat != NULL) { 247129198Scognet 248129198Scognet if (dmat->map_count != 0) 249129198Scognet return (EBUSY); 250129198Scognet 251129198Scognet while (dmat != NULL) { 252129198Scognet bus_dma_tag_t parent; 253129198Scognet 254129198Scognet parent = dmat->parent; 255129198Scognet atomic_subtract_int(&dmat->ref_count, 1); 256129198Scognet if (dmat->ref_count == 0) { 257129198Scognet free(dmat, M_DEVBUF); 258129198Scognet /* 259129198Scognet * Last reference count, so 260129198Scognet * release our reference 261129198Scognet * count on our parent. 262129198Scognet */ 263129198Scognet dmat = parent; 264129198Scognet } else 265129198Scognet dmat = NULL; 266129198Scognet } 267129198Scognet } 268143294Smux CTR2(KTR_BUSDMA, "%s tag %p", __func__, dmat_copy); 269140313Scognet 270129198Scognet return (0); 271129198Scognet} 272129198Scognet 273129198Scognet/* 274129198Scognet * Allocate a handle for mapping from kva/uva/physical 275129198Scognet * address space into bus device space. 276129198Scognet */ 277129198Scognetint 278129198Scognetbus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) 279129198Scognet{ 280129198Scognet bus_dmamap_t newmap; 281140680Scognet#ifdef KTR 282140313Scognet int error = 0; 283140680Scognet#endif 284129198Scognet 285129198Scognet newmap = malloc(sizeof(*newmap), M_DEVBUF, M_NOWAIT | M_ZERO); 286140313Scognet if (newmap == NULL) { 287143294Smux CTR3(KTR_BUSDMA, "%s: tag %p error %d", __func__, dmat, ENOMEM); 288129198Scognet return (ENOMEM); 289140313Scognet } 290129198Scognet *mapp = newmap; 291135644Scognet newmap->dmat = dmat; 292135644Scognet newmap->flags = 0; 293129198Scognet dmat->map_count++; 294129198Scognet 295143294Smux CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 296143284Smux __func__, dmat, dmat->flags, error); 297140313Scognet 298129198Scognet return (0); 299129198Scognet} 300129198Scognet 301129198Scognet/* 302129198Scognet * Destroy a handle for mapping from kva/uva/physical 303129198Scognet * address space into bus device space. 304129198Scognet */ 305129198Scognetint 306129198Scognetbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 307129198Scognet{ 308135644Scognet 309129198Scognet free(map, M_DEVBUF); 310129198Scognet dmat->map_count--; 311143294Smux CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat); 312129198Scognet return (0); 313129198Scognet} 314129198Scognet 315129198Scognet/* 316129198Scognet * Allocate a piece of memory that can be efficiently mapped into 317129198Scognet * bus device space based on the constraints lited in the dma tag. 318129198Scognet * A dmamap to for use with dmamap_load is also allocated. 319129198Scognet */ 320129198Scognetint 321129198Scognetbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 322129198Scognet bus_dmamap_t *mapp) 323129198Scognet{ 324135644Scognet bus_dmamap_t newmap = NULL; 325129198Scognet 326129198Scognet int mflags; 327129198Scognet 328129198Scognet if (flags & BUS_DMA_NOWAIT) 329129198Scognet mflags = M_NOWAIT; 330129198Scognet else 331129198Scognet mflags = M_WAITOK; 332129198Scognet if (flags & BUS_DMA_ZERO) 333129198Scognet mflags |= M_ZERO; 334129198Scognet 335143671Sjmg newmap = malloc(sizeof(*newmap), M_DEVBUF, M_NOWAIT | M_ZERO); 336143671Sjmg if (newmap == NULL) { 337143671Sjmg CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 338143671Sjmg __func__, dmat, dmat->flags, ENOMEM); 339143671Sjmg return (ENOMEM); 340135644Scognet } 341143671Sjmg dmat->map_count++; 342143671Sjmg newmap->flags = 0; 343143671Sjmg *mapp = newmap; 344143671Sjmg newmap->dmat = dmat; 345135644Scognet 346129198Scognet if (dmat->maxsize <= PAGE_SIZE) { 347129198Scognet *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); 348129198Scognet } else { 349129198Scognet /* 350129198Scognet * XXX Use Contigmalloc until it is merged into this facility 351129198Scognet * and handles multi-seg allocations. Nobody is doing 352129198Scognet * multi-seg allocations yet though. 353129198Scognet */ 354129198Scognet *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 355129198Scognet 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 356129198Scognet dmat->boundary); 357129198Scognet } 358140313Scognet if (*vaddr == NULL) { 359140313Scognet if (newmap != NULL) { 360140313Scognet free(newmap, M_DEVBUF); 361140313Scognet dmat->map_count--; 362140313Scognet } 363129198Scognet *mapp = NULL; 364129198Scognet return (ENOMEM); 365129198Scognet } 366129198Scognet return (0); 367129198Scognet} 368129198Scognet 369129198Scognet/* 370129198Scognet * Free a piece of memory and it's allocated dmamap, that was allocated 371129198Scognet * via bus_dmamem_alloc. Make the same choice for free/contigfree. 372129198Scognet */ 373129198Scognetvoid 374129198Scognetbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 375129198Scognet{ 376129198Scognet if (dmat->maxsize <= PAGE_SIZE) 377129198Scognet free(vaddr, M_DEVBUF); 378129198Scognet else { 379129198Scognet contigfree(vaddr, dmat->maxsize, M_DEVBUF); 380129198Scognet } 381135644Scognet dmat->map_count--; 382129198Scognet free(map, M_DEVBUF); 383143294Smux CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags); 384129198Scognet} 385129198Scognet 386129198Scognet/* 387129198Scognet * Utility function to load a linear buffer. lastaddrp holds state 388129198Scognet * between invocations (for multiple-buffer loads). segp contains 389129198Scognet * the starting segment on entrance, and the ending segment on exit. 390129198Scognet * first indicates if this is the first invocation of this function. 391129198Scognet */ 392137758Scognetstatic int __inline 393140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 394137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 395137760Scognet int flags, vm_offset_t *lastaddrp, int *segp) 396129198Scognet{ 397129198Scognet bus_size_t sgsize; 398129198Scognet bus_addr_t curaddr, lastaddr, baddr, bmask; 399129198Scognet vm_offset_t vaddr = (vm_offset_t)buf; 400129198Scognet int seg; 401129198Scognet int error = 0; 402129198Scognet pd_entry_t *pde; 403129198Scognet pt_entry_t pte; 404129198Scognet pt_entry_t *ptep; 405129198Scognet 406129198Scognet lastaddr = *lastaddrp; 407129198Scognet bmask = ~(dmat->boundary - 1); 408129198Scognet 409140313Scognet CTR3(KTR_BUSDMA, "lowaddr= %d boundary= %d, " 410140313Scognet "alignment= %d", dmat->lowaddr, dmat->boundary, dmat->alignment); 411140313Scognet 412129198Scognet for (seg = *segp; buflen > 0 ; ) { 413129198Scognet /* 414129198Scognet * Get the physical address for this segment. 415129198Scognet * 416129198Scognet * XXX Don't support checking for coherent mappings 417129198Scognet * XXX in user address space. 418129198Scognet */ 419129198Scognet if (__predict_true(pmap == pmap_kernel())) { 420129198Scognet (void) pmap_get_pde_pte(pmap, vaddr, &pde, &ptep); 421129198Scognet if (__predict_false(pmap_pde_section(pde))) { 422129198Scognet curaddr = (*pde & L1_S_FRAME) | 423129198Scognet (vaddr & L1_S_OFFSET); 424129198Scognet if (*pde & L1_S_CACHE_MASK) { 425129198Scognet map->flags &= 426135644Scognet ~DMAMAP_COHERENT; 427129198Scognet } 428129198Scognet } else { 429129198Scognet pte = *ptep; 430129198Scognet KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV, 431132514Scognet ("INV type")); 432129198Scognet if (__predict_false((pte & L2_TYPE_MASK) 433129198Scognet == L2_TYPE_L)) { 434129198Scognet curaddr = (pte & L2_L_FRAME) | 435129198Scognet (vaddr & L2_L_OFFSET); 436129198Scognet if (pte & L2_L_CACHE_MASK) { 437129198Scognet map->flags &= 438135644Scognet ~DMAMAP_COHERENT; 439135644Scognet 440129198Scognet } 441129198Scognet } else { 442129198Scognet curaddr = (pte & L2_S_FRAME) | 443129198Scognet (vaddr & L2_S_OFFSET); 444129198Scognet if (pte & L2_S_CACHE_MASK) { 445129198Scognet map->flags &= 446135644Scognet ~DMAMAP_COHERENT; 447129198Scognet } 448129198Scognet } 449129198Scognet } 450129198Scognet } else { 451129198Scognet curaddr = pmap_extract(pmap, vaddr); 452135644Scognet map->flags &= ~DMAMAP_COHERENT; 453129198Scognet } 454129198Scognet 455135644Scognet if (dmat->ranges) { 456135644Scognet struct arm32_dma_range *dr; 457135644Scognet 458135644Scognet dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges, 459135644Scognet curaddr); 460135644Scognet if (dr == NULL) 461135644Scognet return (EINVAL); 462135644Scognet /* 463135644Scognet * In a valid DMA range. Translate the physical 464135644Scognet * memory address to an address in the DMA window. 465135644Scognet */ 466135644Scognet curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase; 467135644Scognet 468135644Scognet } 469129198Scognet /* 470129198Scognet * Compute the segment size, and adjust counts. 471129198Scognet */ 472129198Scognet sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); 473129198Scognet if (buflen < sgsize) 474129198Scognet sgsize = buflen; 475129198Scognet 476129198Scognet /* 477129198Scognet * Make sure we don't cross any boundaries. 478129198Scognet */ 479129198Scognet if (dmat->boundary > 0) { 480129198Scognet baddr = (curaddr + dmat->boundary) & bmask; 481129198Scognet if (sgsize > (baddr - curaddr)) 482129198Scognet sgsize = (baddr - curaddr); 483129198Scognet } 484129198Scognet 485129198Scognet /* 486129198Scognet * Insert chunk into a segment, coalescing with 487129198Scognet * the previous segment if possible. 488129198Scognet */ 489137760Scognet if (seg >= 0 && curaddr == lastaddr && 490137760Scognet (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && 491137760Scognet (dmat->boundary == 0 || 492137760Scognet (segs[seg].ds_addr & bmask) == 493137760Scognet (curaddr & bmask))) { 494137760Scognet segs[seg].ds_len += sgsize; 495140349Scognet goto segdone; 496137760Scognet } else { 497137760Scognet if (++seg >= dmat->nsegments) 498137760Scognet break; 499129198Scognet segs[seg].ds_addr = curaddr; 500129198Scognet segs[seg].ds_len = sgsize; 501129198Scognet } 502135644Scognet if (error) 503135644Scognet break; 504135644Scognetsegdone: 505129198Scognet lastaddr = curaddr + sgsize; 506129198Scognet vaddr += sgsize; 507129198Scognet buflen -= sgsize; 508129198Scognet } 509129198Scognet 510129198Scognet *segp = seg; 511129198Scognet *lastaddrp = lastaddr; 512129198Scognet 513129198Scognet /* 514129198Scognet * Did we fit? 515129198Scognet */ 516129198Scognet if (buflen != 0) 517129198Scognet error = EFBIG; /* XXX better return value here? */ 518129198Scognet return (error); 519129198Scognet} 520129198Scognet 521129198Scognet/* 522140682Scognet * Map the buffer buf into bus space using the dmamap map. 523140682Scognet */ 524140682Scognetint 525140682Scognetbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 526140682Scognet bus_size_t buflen, bus_dmamap_callback_t *callback, 527140682Scognet void *callback_arg, int flags) 528140682Scognet{ 529140682Scognet vm_offset_t lastaddr = 0; 530140682Scognet int error, nsegs = -1; 531143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 532140682Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 533140682Scognet#else 534140682Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 535140682Scognet#endif 536140682Scognet 537143671Sjmg KASSERT(dmat != NULL, ("dmatag is NULL")); 538143671Sjmg KASSERT(map != NULL, ("dmamap is NULL")); 539140682Scognet map->flags &= ~DMAMAP_TYPE_MASK; 540140682Scognet map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT; 541140682Scognet map->buffer = buf; 542140682Scognet map->len = buflen; 543140682Scognet error = bus_dmamap_load_buffer(dmat, 544140682Scognet dm_segments, map, buf, buflen, kernel_pmap, 545140682Scognet flags, &lastaddr, &nsegs); 546140682Scognet if (error) 547140682Scognet (*callback)(callback_arg, NULL, 0, error); 548140682Scognet else 549140682Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, error); 550140682Scognet 551143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 552143284Smux __func__, dmat, dmat->flags, nsegs + 1, error); 553140682Scognet 554140682Scognet return (0); 555140682Scognet} 556140682Scognet 557140682Scognet/* 558129198Scognet * Like bus_dmamap_load(), but for mbufs. 559129198Scognet */ 560129198Scognetint 561129198Scognetbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 562129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 563129198Scognet int flags) 564129198Scognet{ 565143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 566129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 567129198Scognet#else 568129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 569129198Scognet#endif 570137760Scognet int nsegs = -1, error = 0; 571129198Scognet 572129198Scognet M_ASSERTPKTHDR(m0); 573129198Scognet 574135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 575135644Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 576135644Scognet map->buffer = m0; 577129198Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 578129198Scognet vm_offset_t lastaddr = 0; 579129198Scognet struct mbuf *m; 580129198Scognet 581129198Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 582137760Scognet if (m->m_len > 0) 583129198Scognet error = bus_dmamap_load_buffer(dmat, 584137758Scognet dm_segments, map, m->m_data, m->m_len, 585137760Scognet pmap_kernel(), flags, &lastaddr, &nsegs); 586129198Scognet } 587129198Scognet } else { 588129198Scognet error = EINVAL; 589129198Scognet } 590129198Scognet 591129198Scognet if (error) { 592129198Scognet /* 593129198Scognet * force "no valid mappings" on error in callback. 594129198Scognet */ 595129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 596129198Scognet } else { 597135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, 598129198Scognet m0->m_pkthdr.len, error); 599129198Scognet } 600143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 601143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 602140313Scognet 603129198Scognet return (error); 604129198Scognet} 605129198Scognet 606140310Scognetint 607140310Scognetbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 608140310Scognet struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, 609140310Scognet int flags) 610140310Scognet{ 611140310Scognet int error = 0; 612140310Scognet M_ASSERTPKTHDR(m0); 613140310Scognet 614140310Scognet flags |= BUS_DMA_NOWAIT; 615140310Scognet *nsegs = -1; 616140349Scognet map->flags &= ~DMAMAP_TYPE_MASK; 617140349Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 618140349Scognet map->buffer = m0; 619140310Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 620140310Scognet vm_offset_t lastaddr = 0; 621140310Scognet struct mbuf *m; 622140310Scognet 623140310Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 624140310Scognet if (m->m_len > 0) { 625140310Scognet error = bus_dmamap_load_buffer(dmat, segs, map, 626140310Scognet m->m_data, m->m_len, 627140310Scognet pmap_kernel(), flags, &lastaddr, 628140310Scognet nsegs); 629140310Scognet } 630140310Scognet } 631140310Scognet } else { 632140310Scognet error = EINVAL; 633140310Scognet } 634140310Scognet 635140310Scognet /* XXX FIXME: Having to increment nsegs is really annoying */ 636140310Scognet ++*nsegs; 637143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 638143284Smux __func__, dmat, dmat->flags, error, *nsegs); 639140310Scognet return (error); 640140310Scognet} 641140310Scognet 642129198Scognet/* 643129198Scognet * Like bus_dmamap_load(), but for uios. 644129198Scognet */ 645129198Scognetint 646129198Scognetbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 647129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 648129198Scognet int flags) 649129198Scognet{ 650129198Scognet vm_offset_t lastaddr; 651143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 652129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 653129198Scognet#else 654129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 655129198Scognet#endif 656137760Scognet int nsegs, i, error; 657129198Scognet bus_size_t resid; 658129198Scognet struct iovec *iov; 659137758Scognet struct pmap *pmap; 660129198Scognet 661129198Scognet resid = uio->uio_resid; 662129198Scognet iov = uio->uio_iov; 663135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 664135644Scognet map->flags |= DMAMAP_UIO|DMAMAP_COHERENT; 665135644Scognet map->buffer = uio; 666129198Scognet 667129198Scognet if (uio->uio_segflg == UIO_USERSPACE) { 668138683Scognet KASSERT(uio->uio_td != NULL, 669138683Scognet ("bus_dmamap_load_uio: USERSPACE but no proc")); 670137758Scognet pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 671137758Scognet } else 672137758Scognet pmap = kernel_pmap; 673129198Scognet 674137760Scognet error = 0; 675137760Scognet nsegs = -1; 676129198Scognet for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 677129198Scognet /* 678129198Scognet * Now at the first iovec to load. Load each iovec 679129198Scognet * until we have exhausted the residual count. 680129198Scognet */ 681129198Scognet bus_size_t minlen = 682129198Scognet resid < iov[i].iov_len ? resid : iov[i].iov_len; 683129198Scognet caddr_t addr = (caddr_t) iov[i].iov_base; 684129198Scognet 685129198Scognet if (minlen > 0) { 686129198Scognet error = bus_dmamap_load_buffer(dmat, dm_segments, map, 687137760Scognet addr, minlen, pmap, flags, &lastaddr, &nsegs); 688129198Scognet 689129198Scognet resid -= minlen; 690129198Scognet } 691129198Scognet } 692129198Scognet 693129198Scognet if (error) { 694129198Scognet /* 695129198Scognet * force "no valid mappings" on error in callback. 696129198Scognet */ 697129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 698129198Scognet } else { 699129198Scognet (*callback)(callback_arg, dm_segments, nsegs+1, 700129198Scognet uio->uio_resid, error); 701129198Scognet } 702129198Scognet 703143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 704143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 705129198Scognet return (error); 706129198Scognet} 707129198Scognet 708129198Scognet/* 709135644Scognet * Release the mapping held by map. 710129198Scognet */ 711129198Scognetvoid 712143655Sjmg_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 713129198Scognet{ 714135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 715129198Scognet return; 716129198Scognet} 717129198Scognet 718135644Scognetstatic void 719135644Scognetbus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op) 720135644Scognet{ 721135644Scognet 722135644Scognet if (op & BUS_DMASYNC_POSTREAD || 723135644Scognet op == (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) { 724135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 725135644Scognet return; 726135644Scognet } 727135644Scognet if (op & BUS_DMASYNC_PREWRITE) 728135644Scognet cpu_dcache_wb_range((vm_offset_t)buf, len); 729135644Scognet if (op & BUS_DMASYNC_PREREAD) { 730135644Scognet if ((((vm_offset_t)buf | len) & arm_dcache_align_mask) == 0) 731135644Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 732135644Scognet else 733135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 734135644Scognet } 735135644Scognet} 736135644Scognet 737129198Scognetvoid 738143655Sjmg_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 739129198Scognet{ 740135644Scognet struct mbuf *m; 741135644Scognet struct uio *uio; 742135644Scognet int resid; 743135644Scognet struct iovec *iov; 744135644Scognet 745136743Scognet if (op == BUS_DMASYNC_POSTWRITE) 746129198Scognet return; 747135644Scognet if (map->flags & DMAMAP_COHERENT) 748129198Scognet return; 749143294Smux CTR3(KTR_BUSDMA, "%s: op %x flags %x", __func__, op, map->flags); 750135644Scognet switch(map->flags & DMAMAP_TYPE_MASK) { 751135644Scognet case DMAMAP_LINEAR: 752135644Scognet bus_dmamap_sync_buf(map->buffer, map->len, op); 753135644Scognet break; 754135644Scognet case DMAMAP_MBUF: 755135644Scognet m = map->buffer; 756135644Scognet while (m) { 757135644Scognet bus_dmamap_sync_buf(m->m_data, m->m_len, op); 758135644Scognet m = m->m_next; 759135644Scognet } 760135644Scognet break; 761135644Scognet case DMAMAP_UIO: 762135644Scognet uio = map->buffer; 763135644Scognet iov = uio->uio_iov; 764135644Scognet resid = uio->uio_resid; 765135644Scognet for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 766135644Scognet bus_size_t minlen = resid < iov[i].iov_len ? resid : 767135644Scognet iov[i].iov_len; 768135644Scognet if (minlen > 0) { 769135644Scognet bus_dmamap_sync_buf(iov[i].iov_base, minlen, 770135644Scognet op); 771135644Scognet resid -= minlen; 772135644Scognet } 773135644Scognet } 774135644Scognet break; 775135644Scognet default: 776135644Scognet break; 777129198Scognet } 778135644Scognet cpu_drain_writebuf(); 779129198Scognet} 780