busdma_machdep-v4.c revision 140310
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 140310 2005-01-15 19:07:23Z 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 102129198Scognetbus_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); 180129198Scognet if (newtag == NULL) 181129198Scognet return (ENOMEM); 182129198Scognet 183129198Scognet newtag->parent = parent; 184129198Scognet newtag->alignment = alignment; 185129198Scognet newtag->boundary = boundary; 186129198Scognet newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1); 187129198Scognet newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1); 188129198Scognet newtag->filter = filter; 189129198Scognet newtag->filterarg = filterarg; 190129198Scognet newtag->maxsize = maxsize; 191129198Scognet newtag->nsegments = nsegments; 192129198Scognet newtag->maxsegsz = maxsegsz; 193129198Scognet newtag->flags = flags; 194129198Scognet newtag->ref_count = 1; /* Count ourself */ 195129198Scognet newtag->map_count = 0; 196129198Scognet newtag->ranges = bus_dma_get_range(); 197135644Scognet newtag->_nranges = bus_dma_get_range_nb(); 198129198Scognet if (lockfunc != NULL) { 199129198Scognet newtag->lockfunc = lockfunc; 200129198Scognet newtag->lockfuncarg = lockfuncarg; 201129198Scognet } else { 202129198Scognet newtag->lockfunc = dflt_lock; 203129198Scognet newtag->lockfuncarg = NULL; 204129198Scognet } 205129198Scognet /* 206129198Scognet * Take into account any restrictions imposed by our parent tag 207129198Scognet */ 208129198Scognet if (parent != NULL) { 209129198Scognet newtag->lowaddr = min(parent->lowaddr, newtag->lowaddr); 210129198Scognet newtag->highaddr = max(parent->highaddr, newtag->highaddr); 211134934Sscottl if (newtag->boundary == 0) 212134934Sscottl newtag->boundary = parent->boundary; 213134934Sscottl else if (parent->boundary != 0) 214134934Sscottl newtag->boundary = min(parent->boundary, 215134934Sscottl newtag->boundary); 216129198Scognet if (newtag->filter == NULL) { 217129198Scognet /* 218129198Scognet * Short circuit looking at our parent directly 219129198Scognet * since we have encapsulated all of its information 220129198Scognet */ 221129198Scognet newtag->filter = parent->filter; 222129198Scognet newtag->filterarg = parent->filterarg; 223129198Scognet newtag->parent = parent->parent; 224129198Scognet } 225129198Scognet if (newtag->parent != NULL) 226129198Scognet atomic_add_int(&parent->ref_count, 1); 227129198Scognet } 228129198Scognet 229129198Scognet *dmat = newtag; 230129198Scognet return (error); 231129198Scognet} 232129198Scognet 233129198Scognetint 234129198Scognetbus_dma_tag_destroy(bus_dma_tag_t dmat) 235129198Scognet{ 236129198Scognet if (dmat != NULL) { 237129198Scognet 238129198Scognet if (dmat->map_count != 0) 239129198Scognet return (EBUSY); 240129198Scognet 241129198Scognet while (dmat != NULL) { 242129198Scognet bus_dma_tag_t parent; 243129198Scognet 244129198Scognet parent = dmat->parent; 245129198Scognet atomic_subtract_int(&dmat->ref_count, 1); 246129198Scognet if (dmat->ref_count == 0) { 247129198Scognet free(dmat, M_DEVBUF); 248129198Scognet /* 249129198Scognet * Last reference count, so 250129198Scognet * release our reference 251129198Scognet * count on our parent. 252129198Scognet */ 253129198Scognet dmat = parent; 254129198Scognet } else 255129198Scognet dmat = NULL; 256129198Scognet } 257129198Scognet } 258129198Scognet return (0); 259129198Scognet} 260129198Scognet 261129198Scognet/* 262129198Scognet * Allocate a handle for mapping from kva/uva/physical 263129198Scognet * address space into bus device space. 264129198Scognet */ 265129198Scognetint 266129198Scognetbus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) 267129198Scognet{ 268129198Scognet bus_dmamap_t newmap; 269129198Scognet 270129198Scognet newmap = malloc(sizeof(*newmap), M_DEVBUF, M_NOWAIT | M_ZERO); 271129198Scognet if (newmap == NULL) 272129198Scognet return (ENOMEM); 273129198Scognet *mapp = newmap; 274135644Scognet newmap->dmat = dmat; 275135644Scognet newmap->flags = 0; 276129198Scognet dmat->map_count++; 277129198Scognet 278129198Scognet return (0); 279129198Scognet} 280129198Scognet 281129198Scognet/* 282129198Scognet * Destroy a handle for mapping from kva/uva/physical 283129198Scognet * address space into bus device space. 284129198Scognet */ 285129198Scognetint 286129198Scognetbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 287129198Scognet{ 288135644Scognet 289129198Scognet free(map, M_DEVBUF); 290129198Scognet dmat->map_count--; 291129198Scognet return (0); 292129198Scognet} 293129198Scognet 294129198Scognet/* 295129198Scognet * Allocate a piece of memory that can be efficiently mapped into 296129198Scognet * bus device space based on the constraints lited in the dma tag. 297129198Scognet * A dmamap to for use with dmamap_load is also allocated. 298129198Scognet */ 299129198Scognetint 300129198Scognetbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 301129198Scognet bus_dmamap_t *mapp) 302129198Scognet{ 303135644Scognet bus_dmamap_t newmap = NULL; 304129198Scognet 305129198Scognet int mflags; 306129198Scognet 307129198Scognet if (flags & BUS_DMA_NOWAIT) 308129198Scognet mflags = M_NOWAIT; 309129198Scognet else 310129198Scognet mflags = M_WAITOK; 311129198Scognet if (flags & BUS_DMA_ZERO) 312129198Scognet mflags |= M_ZERO; 313129198Scognet 314135644Scognet if (!*mapp) { 315135644Scognet newmap = malloc(sizeof(*newmap), M_DEVBUF, M_NOWAIT | M_ZERO); 316135644Scognet if (newmap == NULL) 317135644Scognet return (ENOMEM); 318135644Scognet dmat->map_count++; 319135644Scognet newmap->flags = 0; 320135644Scognet *mapp = newmap; 321135644Scognet newmap->dmat = dmat; 322135644Scognet } 323135644Scognet 324129198Scognet if (dmat->maxsize <= PAGE_SIZE) { 325129198Scognet *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); 326129198Scognet } else { 327129198Scognet /* 328129198Scognet * XXX Use Contigmalloc until it is merged into this facility 329129198Scognet * and handles multi-seg allocations. Nobody is doing 330129198Scognet * multi-seg allocations yet though. 331129198Scognet */ 332129198Scognet *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 333129198Scognet 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 334129198Scognet dmat->boundary); 335129198Scognet } 336135644Scognet if (*vaddr == NULL && newmap != NULL) { 337129198Scognet free(newmap, M_DEVBUF); 338135644Scognet dmat->map_count--; 339129198Scognet *mapp = NULL; 340129198Scognet return (ENOMEM); 341129198Scognet } 342129198Scognet return (0); 343129198Scognet} 344129198Scognet 345129198Scognet/* 346129198Scognet * Free a piece of memory and it's allocated dmamap, that was allocated 347129198Scognet * via bus_dmamem_alloc. Make the same choice for free/contigfree. 348129198Scognet */ 349129198Scognetvoid 350129198Scognetbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 351129198Scognet{ 352129198Scognet if (dmat->maxsize <= PAGE_SIZE) 353129198Scognet free(vaddr, M_DEVBUF); 354129198Scognet else { 355129198Scognet contigfree(vaddr, dmat->maxsize, M_DEVBUF); 356129198Scognet } 357135644Scognet dmat->map_count--; 358129198Scognet free(map, M_DEVBUF); 359129198Scognet} 360129198Scognet 361129198Scognet/* 362129198Scognet * Map the buffer buf into bus space using the dmamap map. 363129198Scognet */ 364129198Scognetint 365129198Scognetbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 366129198Scognet bus_size_t buflen, bus_dmamap_callback_t *callback, 367129198Scognet void *callback_arg, int flags) 368129198Scognet{ 369129198Scognet vm_offset_t lastaddr = 0; 370137760Scognet int error, nsegs = -1; 371129198Scognet#ifdef __GNUC__ 372129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 373129198Scognet#else 374129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 375129198Scognet#endif 376129198Scognet 377135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 378135644Scognet map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT; 379135644Scognet map->buffer = buf; 380135644Scognet map->len = buflen; 381129198Scognet error = bus_dmamap_load_buffer(dmat, 382137758Scognet dm_segments, map, buf, buflen, kernel_pmap, 383137760Scognet flags, &lastaddr, &nsegs); 384135644Scognet if (error) 385135644Scognet (*callback)(callback_arg, NULL, 0, error); 386135644Scognet else 387135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, error); 388129198Scognet 389129198Scognet return (0); 390129198Scognet} 391129198Scognet 392129198Scognet/* 393129198Scognet * Utility function to load a linear buffer. lastaddrp holds state 394129198Scognet * between invocations (for multiple-buffer loads). segp contains 395129198Scognet * the starting segment on entrance, and the ending segment on exit. 396129198Scognet * first indicates if this is the first invocation of this function. 397129198Scognet */ 398137758Scognetstatic int __inline 399129198Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t segs[], 400137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 401137760Scognet int flags, vm_offset_t *lastaddrp, int *segp) 402129198Scognet{ 403129198Scognet bus_size_t sgsize; 404129198Scognet bus_addr_t curaddr, lastaddr, baddr, bmask; 405129198Scognet vm_offset_t vaddr = (vm_offset_t)buf; 406129198Scognet int seg; 407129198Scognet int error = 0; 408129198Scognet pd_entry_t *pde; 409129198Scognet pt_entry_t pte; 410129198Scognet pt_entry_t *ptep; 411129198Scognet 412129198Scognet lastaddr = *lastaddrp; 413129198Scognet bmask = ~(dmat->boundary - 1); 414129198Scognet 415129198Scognet for (seg = *segp; buflen > 0 ; ) { 416129198Scognet /* 417129198Scognet * Get the physical address for this segment. 418129198Scognet * 419129198Scognet * XXX Don't support checking for coherent mappings 420129198Scognet * XXX in user address space. 421129198Scognet */ 422129198Scognet if (__predict_true(pmap == pmap_kernel())) { 423129198Scognet (void) pmap_get_pde_pte(pmap, vaddr, &pde, &ptep); 424129198Scognet if (__predict_false(pmap_pde_section(pde))) { 425129198Scognet curaddr = (*pde & L1_S_FRAME) | 426129198Scognet (vaddr & L1_S_OFFSET); 427129198Scognet if (*pde & L1_S_CACHE_MASK) { 428129198Scognet map->flags &= 429135644Scognet ~DMAMAP_COHERENT; 430129198Scognet } 431129198Scognet } else { 432129198Scognet pte = *ptep; 433129198Scognet KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV, 434132514Scognet ("INV type")); 435129198Scognet if (__predict_false((pte & L2_TYPE_MASK) 436129198Scognet == L2_TYPE_L)) { 437129198Scognet curaddr = (pte & L2_L_FRAME) | 438129198Scognet (vaddr & L2_L_OFFSET); 439129198Scognet if (pte & L2_L_CACHE_MASK) { 440129198Scognet map->flags &= 441135644Scognet ~DMAMAP_COHERENT; 442135644Scognet 443129198Scognet } 444129198Scognet } else { 445129198Scognet curaddr = (pte & L2_S_FRAME) | 446129198Scognet (vaddr & L2_S_OFFSET); 447129198Scognet if (pte & L2_S_CACHE_MASK) { 448129198Scognet map->flags &= 449135644Scognet ~DMAMAP_COHERENT; 450129198Scognet } 451129198Scognet } 452129198Scognet } 453129198Scognet } else { 454129198Scognet curaddr = pmap_extract(pmap, vaddr); 455135644Scognet map->flags &= ~DMAMAP_COHERENT; 456129198Scognet } 457129198Scognet 458135644Scognet if (dmat->ranges) { 459135644Scognet struct arm32_dma_range *dr; 460135644Scognet 461135644Scognet dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges, 462135644Scognet curaddr); 463135644Scognet if (dr == NULL) 464135644Scognet return (EINVAL); 465135644Scognet /* 466135644Scognet * In a valid DMA range. Translate the physical 467135644Scognet * memory address to an address in the DMA window. 468135644Scognet */ 469135644Scognet curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase; 470135644Scognet 471135644Scognet } 472129198Scognet /* 473129198Scognet * Compute the segment size, and adjust counts. 474129198Scognet */ 475129198Scognet sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); 476129198Scognet if (buflen < sgsize) 477129198Scognet sgsize = buflen; 478129198Scognet 479129198Scognet /* 480129198Scognet * Make sure we don't cross any boundaries. 481129198Scognet */ 482129198Scognet if (dmat->boundary > 0) { 483129198Scognet baddr = (curaddr + dmat->boundary) & bmask; 484129198Scognet if (sgsize > (baddr - curaddr)) 485129198Scognet sgsize = (baddr - curaddr); 486129198Scognet } 487129198Scognet 488129198Scognet /* 489129198Scognet * Insert chunk into a segment, coalescing with 490129198Scognet * the previous segment if possible. 491129198Scognet */ 492137760Scognet if (seg >= 0 && curaddr == lastaddr && 493137760Scognet (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && 494137760Scognet (dmat->boundary == 0 || 495137760Scognet (segs[seg].ds_addr & bmask) == 496137760Scognet (curaddr & bmask))) { 497137760Scognet segs[seg].ds_len += sgsize; 498137760Scognet goto segdone; 499137760Scognet } else { 500137760Scognet if (++seg >= dmat->nsegments) 501137760Scognet break; 502129198Scognet segs[seg].ds_addr = curaddr; 503129198Scognet segs[seg].ds_len = sgsize; 504129198Scognet } 505135644Scognet if (error) 506135644Scognet break; 507135644Scognetsegdone: 508129198Scognet lastaddr = curaddr + sgsize; 509129198Scognet vaddr += sgsize; 510129198Scognet buflen -= sgsize; 511129198Scognet } 512129198Scognet 513129198Scognet *segp = seg; 514129198Scognet *lastaddrp = lastaddr; 515129198Scognet 516129198Scognet /* 517129198Scognet * Did we fit? 518129198Scognet */ 519129198Scognet if (buflen != 0) 520129198Scognet error = EFBIG; /* XXX better return value here? */ 521129198Scognet return (error); 522129198Scognet} 523129198Scognet 524129198Scognet/* 525129198Scognet * Like bus_dmamap_load(), but for mbufs. 526129198Scognet */ 527129198Scognetint 528129198Scognetbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 529129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 530129198Scognet int flags) 531129198Scognet{ 532129198Scognet#ifdef __GNUC__ 533129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 534129198Scognet#else 535129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 536129198Scognet#endif 537137760Scognet int nsegs = -1, error = 0; 538129198Scognet 539129198Scognet M_ASSERTPKTHDR(m0); 540129198Scognet 541135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 542135644Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 543135644Scognet map->buffer = m0; 544129198Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 545129198Scognet vm_offset_t lastaddr = 0; 546129198Scognet struct mbuf *m; 547129198Scognet 548129198Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 549137760Scognet if (m->m_len > 0) 550129198Scognet error = bus_dmamap_load_buffer(dmat, 551137758Scognet dm_segments, map, m->m_data, m->m_len, 552137760Scognet pmap_kernel(), flags, &lastaddr, &nsegs); 553129198Scognet } 554129198Scognet } else { 555129198Scognet error = EINVAL; 556129198Scognet } 557129198Scognet 558129198Scognet if (error) { 559129198Scognet /* 560129198Scognet * force "no valid mappings" on error in callback. 561129198Scognet */ 562129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 563129198Scognet } else { 564135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, 565129198Scognet m0->m_pkthdr.len, error); 566129198Scognet } 567129198Scognet return (error); 568129198Scognet} 569129198Scognet 570140310Scognetint 571140310Scognetbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 572140310Scognet struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, 573140310Scognet int flags) 574140310Scognet{ 575140310Scognet int error = 0; 576140310Scognet M_ASSERTPKTHDR(m0); 577140310Scognet 578140310Scognet flags |= BUS_DMA_NOWAIT; 579140310Scognet *nsegs = -1; 580140310Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 581140310Scognet int first = 1; 582140310Scognet vm_offset_t lastaddr = 0; 583140310Scognet struct mbuf *m; 584140310Scognet 585140310Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 586140310Scognet if (m->m_len > 0) { 587140310Scognet error = bus_dmamap_load_buffer(dmat, segs, map, 588140310Scognet m->m_data, m->m_len, 589140310Scognet pmap_kernel(), flags, &lastaddr, 590140310Scognet nsegs); 591140310Scognet first = 0; 592140310Scognet } 593140310Scognet } 594140310Scognet } else { 595140310Scognet error = EINVAL; 596140310Scognet } 597140310Scognet 598140310Scognet /* XXX FIXME: Having to increment nsegs is really annoying */ 599140310Scognet ++*nsegs; 600140310Scognet CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x " 601140310Scognet "error %d nsegs %d", dmat, dmat->flags, error, *nsegs); 602140310Scognet return (error); 603140310Scognet} 604140310Scognet 605129198Scognet/* 606129198Scognet * Like bus_dmamap_load(), but for uios. 607129198Scognet */ 608129198Scognetint 609129198Scognetbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 610129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 611129198Scognet int flags) 612129198Scognet{ 613129198Scognet vm_offset_t lastaddr; 614129198Scognet#ifdef __GNUC__ 615129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 616129198Scognet#else 617129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 618129198Scognet#endif 619137760Scognet int nsegs, i, error; 620129198Scognet bus_size_t resid; 621129198Scognet struct iovec *iov; 622137758Scognet struct pmap *pmap; 623129198Scognet 624129198Scognet resid = uio->uio_resid; 625129198Scognet iov = uio->uio_iov; 626135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 627135644Scognet map->flags |= DMAMAP_UIO|DMAMAP_COHERENT; 628135644Scognet map->buffer = uio; 629129198Scognet 630129198Scognet if (uio->uio_segflg == UIO_USERSPACE) { 631138683Scognet KASSERT(uio->uio_td != NULL, 632138683Scognet ("bus_dmamap_load_uio: USERSPACE but no proc")); 633137758Scognet pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 634137758Scognet } else 635137758Scognet pmap = kernel_pmap; 636129198Scognet 637137760Scognet error = 0; 638137760Scognet nsegs = -1; 639129198Scognet for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 640129198Scognet /* 641129198Scognet * Now at the first iovec to load. Load each iovec 642129198Scognet * until we have exhausted the residual count. 643129198Scognet */ 644129198Scognet bus_size_t minlen = 645129198Scognet resid < iov[i].iov_len ? resid : iov[i].iov_len; 646129198Scognet caddr_t addr = (caddr_t) iov[i].iov_base; 647129198Scognet 648129198Scognet if (minlen > 0) { 649129198Scognet error = bus_dmamap_load_buffer(dmat, dm_segments, map, 650137760Scognet addr, minlen, pmap, flags, &lastaddr, &nsegs); 651129198Scognet 652129198Scognet resid -= minlen; 653129198Scognet } 654129198Scognet } 655129198Scognet 656129198Scognet if (error) { 657129198Scognet /* 658129198Scognet * force "no valid mappings" on error in callback. 659129198Scognet */ 660129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 661129198Scognet } else { 662129198Scognet (*callback)(callback_arg, dm_segments, nsegs+1, 663129198Scognet uio->uio_resid, error); 664129198Scognet } 665129198Scognet 666129198Scognet return (error); 667129198Scognet} 668129198Scognet 669129198Scognet/* 670135644Scognet * Release the mapping held by map. 671129198Scognet */ 672129198Scognetvoid 673129198Scognetbus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 674129198Scognet{ 675135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 676129198Scognet return; 677129198Scognet} 678129198Scognet 679135644Scognetstatic void 680135644Scognetbus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op) 681135644Scognet{ 682135644Scognet 683135644Scognet if (op & BUS_DMASYNC_POSTREAD || 684135644Scognet op == (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) { 685135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 686135644Scognet return; 687135644Scognet } 688135644Scognet if (op & BUS_DMASYNC_PREWRITE) 689135644Scognet cpu_dcache_wb_range((vm_offset_t)buf, len); 690135644Scognet if (op & BUS_DMASYNC_PREREAD) { 691135644Scognet if ((((vm_offset_t)buf | len) & arm_dcache_align_mask) == 0) 692135644Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 693135644Scognet else 694135644Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 695135644Scognet } 696135644Scognet} 697135644Scognet 698129198Scognetvoid 699129198Scognetbus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 700129198Scognet{ 701135644Scognet struct mbuf *m; 702135644Scognet struct uio *uio; 703135644Scognet int resid; 704135644Scognet struct iovec *iov; 705135644Scognet 706136743Scognet if (op == BUS_DMASYNC_POSTWRITE) 707129198Scognet return; 708135644Scognet if (map->flags & DMAMAP_COHERENT) 709129198Scognet return; 710135644Scognet switch(map->flags & DMAMAP_TYPE_MASK) { 711135644Scognet case DMAMAP_LINEAR: 712135644Scognet bus_dmamap_sync_buf(map->buffer, map->len, op); 713135644Scognet break; 714135644Scognet case DMAMAP_MBUF: 715135644Scognet m = map->buffer; 716135644Scognet while (m) { 717135644Scognet bus_dmamap_sync_buf(m->m_data, m->m_len, op); 718135644Scognet m = m->m_next; 719135644Scognet } 720135644Scognet break; 721135644Scognet case DMAMAP_UIO: 722135644Scognet uio = map->buffer; 723135644Scognet iov = uio->uio_iov; 724135644Scognet resid = uio->uio_resid; 725135644Scognet for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 726135644Scognet bus_size_t minlen = resid < iov[i].iov_len ? resid : 727135644Scognet iov[i].iov_len; 728135644Scognet if (minlen > 0) { 729135644Scognet bus_dmamap_sync_buf(iov[i].iov_base, minlen, 730135644Scognet op); 731135644Scognet resid -= minlen; 732135644Scognet } 733135644Scognet } 734135644Scognet break; 735135644Scognet default: 736135644Scognet break; 737129198Scognet } 738135644Scognet cpu_drain_writebuf(); 739129198Scognet} 740