busdma_machdep-v4.c revision 140682
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 140682 2005-01-23 22:07:33Z cognet $"); 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) { 181140313Scognet CTR3(KTR_BUSDMA, "bus_dma_tag_create returned tag %p tag " 182140313Scognet "flags 0x%x error %d", 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; 233140313Scognet CTR3(KTR_BUSDMA, "bus_dma_tag_create returned tag %p tag flags 0x%x " 234140313Scognet "error %d", 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 } 268140313Scognet CTR1(KTR_BUSDMA, "bus_dma_tag_destroy tag %p", 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) { 287140313Scognet CTR2(KTR_BUSDMA, "bus_dmamap_create: tag %p error %d", 288140313Scognet dmat, ENOMEM); 289129198Scognet return (ENOMEM); 290140313Scognet } 291129198Scognet *mapp = newmap; 292135644Scognet newmap->dmat = dmat; 293135644Scognet newmap->flags = 0; 294129198Scognet dmat->map_count++; 295129198Scognet 296140313Scognet CTR3(KTR_BUSDMA, "bus_dmamap_create: tag %p tag flags 0x%x error %d", 297140313Scognet dmat, dmat->flags, error); 298140313Scognet 299129198Scognet return (0); 300129198Scognet} 301129198Scognet 302129198Scognet/* 303129198Scognet * Destroy a handle for mapping from kva/uva/physical 304129198Scognet * address space into bus device space. 305129198Scognet */ 306129198Scognetint 307129198Scognetbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 308129198Scognet{ 309135644Scognet 310129198Scognet free(map, M_DEVBUF); 311129198Scognet dmat->map_count--; 312140313Scognet CTR1(KTR_BUSDMA, "bus_dmamap_destroy: tag %p error 0", dmat); 313129198Scognet return (0); 314129198Scognet} 315129198Scognet 316129198Scognet/* 317129198Scognet * Allocate a piece of memory that can be efficiently mapped into 318129198Scognet * bus device space based on the constraints lited in the dma tag. 319129198Scognet * A dmamap to for use with dmamap_load is also allocated. 320129198Scognet */ 321129198Scognetint 322129198Scognetbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 323129198Scognet bus_dmamap_t *mapp) 324129198Scognet{ 325135644Scognet bus_dmamap_t newmap = NULL; 326129198Scognet 327129198Scognet int mflags; 328129198Scognet 329129198Scognet if (flags & BUS_DMA_NOWAIT) 330129198Scognet mflags = M_NOWAIT; 331129198Scognet else 332129198Scognet mflags = M_WAITOK; 333129198Scognet if (flags & BUS_DMA_ZERO) 334129198Scognet mflags |= M_ZERO; 335129198Scognet 336135644Scognet if (!*mapp) { 337135644Scognet newmap = malloc(sizeof(*newmap), M_DEVBUF, M_NOWAIT | M_ZERO); 338140313Scognet if (newmap == NULL) { 339140313Scognet CTR3(KTR_BUSDMA, "bus_dmamem_alloc: tag %p tag " 340140313Scognet "flags %0x%x error Md", dmat, dmat->flags, ENOMEM); 341135644Scognet return (ENOMEM); 342140313Scognet } 343135644Scognet dmat->map_count++; 344135644Scognet newmap->flags = 0; 345135644Scognet *mapp = newmap; 346135644Scognet newmap->dmat = dmat; 347135644Scognet } 348135644Scognet 349129198Scognet if (dmat->maxsize <= PAGE_SIZE) { 350129198Scognet *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); 351129198Scognet } else { 352129198Scognet /* 353129198Scognet * XXX Use Contigmalloc until it is merged into this facility 354129198Scognet * and handles multi-seg allocations. Nobody is doing 355129198Scognet * multi-seg allocations yet though. 356129198Scognet */ 357129198Scognet *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 358129198Scognet 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 359129198Scognet dmat->boundary); 360129198Scognet } 361140313Scognet if (*vaddr == NULL) { 362140313Scognet if (newmap != NULL) { 363140313Scognet free(newmap, M_DEVBUF); 364140313Scognet dmat->map_count--; 365140313Scognet } 366129198Scognet *mapp = NULL; 367129198Scognet return (ENOMEM); 368129198Scognet } 369129198Scognet return (0); 370129198Scognet} 371129198Scognet 372129198Scognet/* 373129198Scognet * Free a piece of memory and it's allocated dmamap, that was allocated 374129198Scognet * via bus_dmamem_alloc. Make the same choice for free/contigfree. 375129198Scognet */ 376129198Scognetvoid 377129198Scognetbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 378129198Scognet{ 379129198Scognet if (dmat->maxsize <= PAGE_SIZE) 380129198Scognet free(vaddr, M_DEVBUF); 381129198Scognet else { 382129198Scognet contigfree(vaddr, dmat->maxsize, M_DEVBUF); 383129198Scognet } 384135644Scognet dmat->map_count--; 385129198Scognet free(map, M_DEVBUF); 386140313Scognet CTR2(KTR_BUSDMA, "bus_dmamem_free: tag %p flags 0x%x", dmat, 387140313Scognet dmat->flags); 388129198Scognet} 389129198Scognet 390129198Scognet/* 391129198Scognet * Utility function to load a linear buffer. lastaddrp holds state 392129198Scognet * between invocations (for multiple-buffer loads). segp contains 393129198Scognet * the starting segment on entrance, and the ending segment on exit. 394129198Scognet * first indicates if this is the first invocation of this function. 395129198Scognet */ 396137758Scognetstatic int __inline 397140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 398137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 399137760Scognet int flags, vm_offset_t *lastaddrp, int *segp) 400129198Scognet{ 401129198Scognet bus_size_t sgsize; 402129198Scognet bus_addr_t curaddr, lastaddr, baddr, bmask; 403129198Scognet vm_offset_t vaddr = (vm_offset_t)buf; 404129198Scognet int seg; 405129198Scognet int error = 0; 406129198Scognet pd_entry_t *pde; 407129198Scognet pt_entry_t pte; 408129198Scognet pt_entry_t *ptep; 409129198Scognet 410129198Scognet lastaddr = *lastaddrp; 411129198Scognet bmask = ~(dmat->boundary - 1); 412129198Scognet 413140313Scognet CTR3(KTR_BUSDMA, "lowaddr= %d boundary= %d, " 414140313Scognet "alignment= %d", dmat->lowaddr, dmat->boundary, dmat->alignment); 415140313Scognet 416129198Scognet for (seg = *segp; buflen > 0 ; ) { 417129198Scognet /* 418129198Scognet * Get the physical address for this segment. 419129198Scognet * 420129198Scognet * XXX Don't support checking for coherent mappings 421129198Scognet * XXX in user address space. 422129198Scognet */ 423129198Scognet if (__predict_true(pmap == pmap_kernel())) { 424129198Scognet (void) pmap_get_pde_pte(pmap, vaddr, &pde, &ptep); 425129198Scognet if (__predict_false(pmap_pde_section(pde))) { 426129198Scognet curaddr = (*pde & L1_S_FRAME) | 427129198Scognet (vaddr & L1_S_OFFSET); 428129198Scognet if (*pde & L1_S_CACHE_MASK) { 429129198Scognet map->flags &= 430135644Scognet ~DMAMAP_COHERENT; 431129198Scognet } 432129198Scognet } else { 433129198Scognet pte = *ptep; 434129198Scognet KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV, 435132514Scognet ("INV type")); 436129198Scognet if (__predict_false((pte & L2_TYPE_MASK) 437129198Scognet == L2_TYPE_L)) { 438129198Scognet curaddr = (pte & L2_L_FRAME) | 439129198Scognet (vaddr & L2_L_OFFSET); 440129198Scognet if (pte & L2_L_CACHE_MASK) { 441129198Scognet map->flags &= 442135644Scognet ~DMAMAP_COHERENT; 443135644Scognet 444129198Scognet } 445129198Scognet } else { 446129198Scognet curaddr = (pte & L2_S_FRAME) | 447129198Scognet (vaddr & L2_S_OFFSET); 448129198Scognet if (pte & L2_S_CACHE_MASK) { 449129198Scognet map->flags &= 450135644Scognet ~DMAMAP_COHERENT; 451129198Scognet } 452129198Scognet } 453129198Scognet } 454129198Scognet } else { 455129198Scognet curaddr = pmap_extract(pmap, vaddr); 456135644Scognet map->flags &= ~DMAMAP_COHERENT; 457129198Scognet } 458129198Scognet 459135644Scognet if (dmat->ranges) { 460135644Scognet struct arm32_dma_range *dr; 461135644Scognet 462135644Scognet dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges, 463135644Scognet curaddr); 464135644Scognet if (dr == NULL) 465135644Scognet return (EINVAL); 466135644Scognet /* 467135644Scognet * In a valid DMA range. Translate the physical 468135644Scognet * memory address to an address in the DMA window. 469135644Scognet */ 470135644Scognet curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase; 471135644Scognet 472135644Scognet } 473129198Scognet /* 474129198Scognet * Compute the segment size, and adjust counts. 475129198Scognet */ 476129198Scognet sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); 477129198Scognet if (buflen < sgsize) 478129198Scognet sgsize = buflen; 479129198Scognet 480129198Scognet /* 481129198Scognet * Make sure we don't cross any boundaries. 482129198Scognet */ 483129198Scognet if (dmat->boundary > 0) { 484129198Scognet baddr = (curaddr + dmat->boundary) & bmask; 485129198Scognet if (sgsize > (baddr - curaddr)) 486129198Scognet sgsize = (baddr - curaddr); 487129198Scognet } 488129198Scognet 489129198Scognet /* 490129198Scognet * Insert chunk into a segment, coalescing with 491129198Scognet * the previous segment if possible. 492129198Scognet */ 493137760Scognet if (seg >= 0 && curaddr == lastaddr && 494137760Scognet (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && 495137760Scognet (dmat->boundary == 0 || 496137760Scognet (segs[seg].ds_addr & bmask) == 497137760Scognet (curaddr & bmask))) { 498137760Scognet segs[seg].ds_len += sgsize; 499140349Scognet goto segdone; 500137760Scognet } else { 501137760Scognet if (++seg >= dmat->nsegments) 502137760Scognet break; 503129198Scognet segs[seg].ds_addr = curaddr; 504129198Scognet segs[seg].ds_len = sgsize; 505129198Scognet } 506135644Scognet if (error) 507135644Scognet break; 508135644Scognetsegdone: 509129198Scognet lastaddr = curaddr + sgsize; 510129198Scognet vaddr += sgsize; 511129198Scognet buflen -= sgsize; 512129198Scognet } 513129198Scognet 514129198Scognet *segp = seg; 515129198Scognet *lastaddrp = lastaddr; 516129198Scognet 517129198Scognet /* 518129198Scognet * Did we fit? 519129198Scognet */ 520129198Scognet if (buflen != 0) 521129198Scognet error = EFBIG; /* XXX better return value here? */ 522129198Scognet return (error); 523129198Scognet} 524129198Scognet 525129198Scognet/* 526140682Scognet * Map the buffer buf into bus space using the dmamap map. 527140682Scognet */ 528140682Scognetint 529140682Scognetbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 530140682Scognet bus_size_t buflen, bus_dmamap_callback_t *callback, 531140682Scognet void *callback_arg, int flags) 532140682Scognet{ 533140682Scognet vm_offset_t lastaddr = 0; 534140682Scognet int error, nsegs = -1; 535140682Scognet#ifdef __GNUC__ 536140682Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 537140682Scognet#else 538140682Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 539140682Scognet#endif 540140682Scognet 541140682Scognet map->flags &= ~DMAMAP_TYPE_MASK; 542140682Scognet map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT; 543140682Scognet map->buffer = buf; 544140682Scognet map->len = buflen; 545140682Scognet error = bus_dmamap_load_buffer(dmat, 546140682Scognet dm_segments, map, buf, buflen, kernel_pmap, 547140682Scognet flags, &lastaddr, &nsegs); 548140682Scognet if (error) 549140682Scognet (*callback)(callback_arg, NULL, 0, error); 550140682Scognet else 551140682Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, error); 552140682Scognet 553140682Scognet CTR4(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x error %d " 554140682Scognet "nsegs %d", dmat, dmat->flags, nsegs + 1, error); 555140682Scognet 556140682Scognet return (0); 557140682Scognet} 558140682Scognet 559140682Scognet/* 560129198Scognet * Like bus_dmamap_load(), but for mbufs. 561129198Scognet */ 562129198Scognetint 563129198Scognetbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 564129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 565129198Scognet int flags) 566129198Scognet{ 567129198Scognet#ifdef __GNUC__ 568129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 569129198Scognet#else 570129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 571129198Scognet#endif 572137760Scognet int nsegs = -1, error = 0; 573129198Scognet 574129198Scognet M_ASSERTPKTHDR(m0); 575129198Scognet 576135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 577135644Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 578135644Scognet map->buffer = m0; 579129198Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 580129198Scognet vm_offset_t lastaddr = 0; 581129198Scognet struct mbuf *m; 582129198Scognet 583129198Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 584137760Scognet if (m->m_len > 0) 585129198Scognet error = bus_dmamap_load_buffer(dmat, 586137758Scognet dm_segments, map, m->m_data, m->m_len, 587137760Scognet pmap_kernel(), flags, &lastaddr, &nsegs); 588129198Scognet } 589129198Scognet } else { 590129198Scognet error = EINVAL; 591129198Scognet } 592129198Scognet 593129198Scognet if (error) { 594129198Scognet /* 595129198Scognet * force "no valid mappings" on error in callback. 596129198Scognet */ 597129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 598129198Scognet } else { 599135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, 600129198Scognet m0->m_pkthdr.len, error); 601129198Scognet } 602140313Scognet CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x " 603140313Scognet "error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1); 604140313Scognet 605129198Scognet return (error); 606129198Scognet} 607129198Scognet 608140310Scognetint 609140310Scognetbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 610140310Scognet struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, 611140310Scognet int flags) 612140310Scognet{ 613140310Scognet int error = 0; 614140310Scognet M_ASSERTPKTHDR(m0); 615140310Scognet 616140310Scognet flags |= BUS_DMA_NOWAIT; 617140310Scognet *nsegs = -1; 618140349Scognet map->flags &= ~DMAMAP_TYPE_MASK; 619140349Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 620140349Scognet map->buffer = m0; 621140310Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 622140310Scognet vm_offset_t lastaddr = 0; 623140310Scognet struct mbuf *m; 624140310Scognet 625140310Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 626140310Scognet if (m->m_len > 0) { 627140310Scognet error = bus_dmamap_load_buffer(dmat, segs, map, 628140310Scognet m->m_data, m->m_len, 629140310Scognet pmap_kernel(), flags, &lastaddr, 630140310Scognet nsegs); 631140310Scognet } 632140310Scognet } 633140310Scognet } else { 634140310Scognet error = EINVAL; 635140310Scognet } 636140310Scognet 637140310Scognet /* XXX FIXME: Having to increment nsegs is really annoying */ 638140310Scognet ++*nsegs; 639140310Scognet CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x " 640140310Scognet "error %d nsegs %d", dmat, dmat->flags, error, *nsegs); 641140310Scognet return (error); 642140310Scognet} 643140310Scognet 644129198Scognet/* 645129198Scognet * Like bus_dmamap_load(), but for uios. 646129198Scognet */ 647129198Scognetint 648129198Scognetbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 649129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 650129198Scognet int flags) 651129198Scognet{ 652129198Scognet vm_offset_t lastaddr; 653129198Scognet#ifdef __GNUC__ 654129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 655129198Scognet#else 656129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 657129198Scognet#endif 658137760Scognet int nsegs, i, error; 659129198Scognet bus_size_t resid; 660129198Scognet struct iovec *iov; 661137758Scognet struct pmap *pmap; 662129198Scognet 663129198Scognet resid = uio->uio_resid; 664129198Scognet iov = uio->uio_iov; 665135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 666135644Scognet map->flags |= DMAMAP_UIO|DMAMAP_COHERENT; 667135644Scognet map->buffer = uio; 668129198Scognet 669129198Scognet if (uio->uio_segflg == UIO_USERSPACE) { 670138683Scognet KASSERT(uio->uio_td != NULL, 671138683Scognet ("bus_dmamap_load_uio: USERSPACE but no proc")); 672137758Scognet pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 673137758Scognet } else 674137758Scognet pmap = kernel_pmap; 675129198Scognet 676137760Scognet error = 0; 677137760Scognet nsegs = -1; 678129198Scognet for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 679129198Scognet /* 680129198Scognet * Now at the first iovec to load. Load each iovec 681129198Scognet * until we have exhausted the residual count. 682129198Scognet */ 683129198Scognet bus_size_t minlen = 684129198Scognet resid < iov[i].iov_len ? resid : iov[i].iov_len; 685129198Scognet caddr_t addr = (caddr_t) iov[i].iov_base; 686129198Scognet 687129198Scognet if (minlen > 0) { 688129198Scognet error = bus_dmamap_load_buffer(dmat, dm_segments, map, 689137760Scognet addr, minlen, pmap, flags, &lastaddr, &nsegs); 690129198Scognet 691129198Scognet resid -= minlen; 692129198Scognet } 693129198Scognet } 694129198Scognet 695129198Scognet if (error) { 696129198Scognet /* 697129198Scognet * force "no valid mappings" on error in callback. 698129198Scognet */ 699129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 700129198Scognet } else { 701129198Scognet (*callback)(callback_arg, dm_segments, nsegs+1, 702129198Scognet uio->uio_resid, error); 703129198Scognet } 704129198Scognet 705140313Scognet CTR4(KTR_BUSDMA, "bus_dmamap_load_uio: tag %p tag flags 0x%x " 706140313Scognet "error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1); 707129198Scognet return (error); 708129198Scognet} 709129198Scognet 710129198Scognet/* 711135644Scognet * Release the mapping held by map. 712129198Scognet */ 713129198Scognetvoid 714129198Scognetbus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 715129198Scognet{ 716135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 717129198Scognet return; 718129198Scognet} 719129198Scognet 720135644Scognetstatic void 721135644Scognetbus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op) 722135644Scognet{ 723135644Scognet 724135644Scognet if (op & BUS_DMASYNC_POSTREAD || 725135644Scognet op == (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) { 726135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 727135644Scognet return; 728135644Scognet } 729135644Scognet if (op & BUS_DMASYNC_PREWRITE) 730135644Scognet cpu_dcache_wb_range((vm_offset_t)buf, len); 731135644Scognet if (op & BUS_DMASYNC_PREREAD) { 732135644Scognet if ((((vm_offset_t)buf | len) & arm_dcache_align_mask) == 0) 733135644Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 734135644Scognet else 735135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 736135644Scognet } 737135644Scognet} 738135644Scognet 739129198Scognetvoid 740129198Scognetbus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 741129198Scognet{ 742135644Scognet struct mbuf *m; 743135644Scognet struct uio *uio; 744135644Scognet int resid; 745135644Scognet struct iovec *iov; 746135644Scognet 747136743Scognet if (op == BUS_DMASYNC_POSTWRITE) 748129198Scognet return; 749135644Scognet if (map->flags & DMAMAP_COHERENT) 750129198Scognet return; 751140313Scognet CTR2(KTR_BUSDMA, "bus_dmamap_sync: op %x flags %x", op, map->flags); 752135644Scognet switch(map->flags & DMAMAP_TYPE_MASK) { 753135644Scognet case DMAMAP_LINEAR: 754135644Scognet bus_dmamap_sync_buf(map->buffer, map->len, op); 755135644Scognet break; 756135644Scognet case DMAMAP_MBUF: 757135644Scognet m = map->buffer; 758135644Scognet while (m) { 759135644Scognet bus_dmamap_sync_buf(m->m_data, m->m_len, op); 760135644Scognet m = m->m_next; 761135644Scognet } 762135644Scognet break; 763135644Scognet case DMAMAP_UIO: 764135644Scognet uio = map->buffer; 765135644Scognet iov = uio->uio_iov; 766135644Scognet resid = uio->uio_resid; 767135644Scognet for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 768135644Scognet bus_size_t minlen = resid < iov[i].iov_len ? resid : 769135644Scognet iov[i].iov_len; 770135644Scognet if (minlen > 0) { 771135644Scognet bus_dmamap_sync_buf(iov[i].iov_base, minlen, 772135644Scognet op); 773135644Scognet resid -= minlen; 774135644Scognet } 775135644Scognet } 776135644Scognet break; 777135644Scognet default: 778135644Scognet break; 779129198Scognet } 780135644Scognet cpu_drain_writebuf(); 781129198Scognet} 782