1 /*- 2 * Copyright (c) 1997, 1998 Justin T. Gibbs. 3 * Copyright (c) 2013, 2015 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Portions of this software were developed by Semihalf 10 * under sponsorship of the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification, immediately at the beginning of the file. 18 * 2. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/ktr.h> 40 #include <sys/lock.h> 41 #include <sys/memdesc.h> 42 #include <sys/mutex.h> 43 #include <sys/uio.h> 44 #include <vm/vm.h> 45 #include <vm/vm_extern.h> 46 #include <vm/pmap.h> 47 48 #include <machine/bus.h> 49 #include <machine/bus_dma_impl.h> 50 51 int 52 common_bus_dma_tag_create(struct bus_dma_tag_common *parent, 53 bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr, 54 bus_addr_t highaddr, bus_size_t maxsize, int nsegments, 55 bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 56 void *lockfuncarg, size_t sz, void **dmat) 57 { 58 void *newtag; 59 struct bus_dma_tag_common *common; 60 61 KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz")); 62 /* Return a NULL tag on failure */ 63 *dmat = NULL; 64 /* Basic sanity checking */ 65 if (boundary != 0 && boundary < maxsegsz) 66 maxsegsz = boundary; 67 if (maxsegsz == 0) 68 return (EINVAL); 69 70 newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT); 71 if (newtag == NULL) { 72 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 73 __func__, newtag, 0, ENOMEM); 74 return (ENOMEM); 75 } 76 77 common = newtag; 78 common->impl = &bus_dma_bounce_impl; 79 common->alignment = alignment; 80 common->boundary = boundary; 81 common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1); 82 common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1); 83 common->maxsize = maxsize; 84 common->nsegments = nsegments; 85 common->maxsegsz = maxsegsz; 86 common->flags = flags; 87 if (lockfunc != NULL) { 88 common->lockfunc = lockfunc; 89 common->lockfuncarg = lockfuncarg; 90 } else { 91 common->lockfunc = _busdma_dflt_lock; 92 common->lockfuncarg = NULL; 93 } 94 95 /* Take into account any restrictions imposed by our parent tag */ 96 if (parent != NULL) { 97 common->impl = parent->impl; 98 common->lowaddr = MIN(parent->lowaddr, common->lowaddr); 99 common->highaddr = MAX(parent->highaddr, common->highaddr); 100 if (common->boundary == 0) 101 common->boundary = parent->boundary; 102 else if (parent->boundary != 0) { 103 common->boundary = MIN(parent->boundary, 104 common->boundary); 105 } 106 } 107 *dmat = common; 108 return (0); 109 } 110 111 /* 112 * Allocate a device specific dma_tag. 113 */ 114 int 115 bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 116 bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr, 117 bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize, 118 int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 119 void *lockfuncarg, bus_dma_tag_t *dmat) 120 { 121 struct bus_dma_tag_common *tc; 122 int error; 123 124 /* Filters are no longer supported. */ 125 if (filter != NULL || filterarg != NULL) 126 return (EINVAL); 127 128 if (parent == NULL) { 129 error = bus_dma_bounce_impl.tag_create(parent, alignment, 130 boundary, lowaddr, highaddr, maxsize, nsegments, maxsegsz, 131 flags, lockfunc, lockfuncarg, dmat); 132 } else { 133 tc = (struct bus_dma_tag_common *)parent; 134 error = tc->impl->tag_create(parent, alignment, 135 boundary, lowaddr, highaddr, maxsize, nsegments, maxsegsz, 136 flags, lockfunc, lockfuncarg, dmat); 137 } 138 return (error); 139 } 140 141 void 142 bus_dma_template_clone(bus_dma_template_t *t, bus_dma_tag_t dmat) 143 { 144 struct bus_dma_tag_common *common; 145 146 if (t == NULL || dmat == NULL) 147 return; 148 149 common = (struct bus_dma_tag_common *)dmat; 150 151 t->alignment = common->alignment; 152 t->boundary = common->boundary; 153 t->lowaddr = common->lowaddr; 154 t->highaddr = common->highaddr; 155 t->maxsize = common->maxsize; 156 t->nsegments = common->nsegments; 157 t->maxsegsize = common->maxsegsz; 158 t->flags = common->flags; 159 t->lockfunc = common->lockfunc; 160 t->lockfuncarg = common->lockfuncarg; 161 } 162 163 int 164 bus_dma_tag_destroy(bus_dma_tag_t dmat) 165 { 166 struct bus_dma_tag_common *tc; 167 168 tc = (struct bus_dma_tag_common *)dmat; 169 return (tc->impl->tag_destroy(dmat)); 170 } 171 172 int 173 bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain) 174 { 175 176 return (0); 177 } 178