sys/arch/vax/uba/uba_dma.c

   1 /* $NetBSD: uba_dma.c,v 1.9 2008/03/11 05:34:02 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __KERNEL_RCSID(0, "$NetBSD: uba_dma.c,v 1.9 2008/03/11 05:34:02 matt Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/device.h>
  40 #include <sys/malloc.h>
  41 #include <uvm/uvm_extern.h>
  42
  43 #define _VAX_BUS_DMA_PRIVATE
  44 #include <machine/bus.h>
  45 #include <machine/cpu.h>
  46 #include <machine/sgmap.h>
  47
  48 #include <dev/qbus/ubavar.h>
  49
  50 #include <arch/vax/uba/uba_common.h>
  51
  52 int     uba_bus_dmamap_create_sgmap(bus_dma_tag_t, bus_size_t, int,
  53             bus_size_t, bus_size_t, int, bus_dmamap_t *);
  54
  55 void    uba_bus_dmamap_destroy_sgmap(bus_dma_tag_t, bus_dmamap_t);
  56
  57 int     uba_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
  58             bus_size_t, struct proc *, int);
  59
  60 int     uba_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
  61             struct mbuf *, int);
  62
  63 int     uba_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
  64             struct uio *, int);
  65
  66 int     uba_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
  67             bus_dma_segment_t *, int, bus_size_t, int);
  68
  69 void    uba_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
  70
  71 void    uba_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
  72             bus_size_t, int);
  73
  74 void
  75 uba_dma_init(struct uba_vsoftc *sc)
  76 {
  77         bus_dma_tag_t t;
  78         struct pte *pte;
  79
  80         /*
  81          * Initialize the DMA tag used for sgmap-mapped DMA.
  82          */
  83         t = &sc->uv_dmat;
  84         t->_cookie = sc;
  85         t->_wbase = 0;
  86         t->_wsize = sc->uv_size;
  87         t->_boundary = 0;
  88         t->_sgmap = &sc->uv_sgmap;
  89         t->_dmamap_create = uba_bus_dmamap_create_sgmap;
  90         t->_dmamap_destroy = uba_bus_dmamap_destroy_sgmap;
  91         t->_dmamap_load = uba_bus_dmamap_load_sgmap;
  92         t->_dmamap_load_mbuf = uba_bus_dmamap_load_mbuf_sgmap;
  93         t->_dmamap_load_uio = uba_bus_dmamap_load_uio_sgmap;
  94         t->_dmamap_load_raw = uba_bus_dmamap_load_raw_sgmap;
  95         t->_dmamap_unload = uba_bus_dmamap_unload_sgmap;
  96         t->_dmamap_sync = uba_bus_dmamap_sync;
  97
  98         t->_dmamem_alloc = _bus_dmamem_alloc;
  99         t->_dmamem_free = _bus_dmamem_free;
 100         t->_dmamem_map = _bus_dmamem_map;
 101         t->_dmamem_unmap = _bus_dmamem_unmap;
 102         t->_dmamem_mmap = _bus_dmamem_mmap;
 103
 104         /*
 105          * Map in Unibus map registers, if not mapped in already.
 106          */
 107         if (sc->uv_uba) {
 108                 pte = sc->uv_uba->uba_map;
 109         } else {
 110                 pte = (struct pte *)vax_map_physmem(sc->uv_addr,
 111                     vax_btoc(vax_btoc(sc->uv_size) * sizeof(struct pte)));
 112                 if (pte == 0)
 113                         panic("uba_dma_init");
 114         }
 115         /*
 116          * Initialize the SGMAP.
 117          */
 118         vax_sgmap_init(t, &sc->uv_sgmap, "uba_sgmap", 0, sc->uv_size, pte, 0);
 119
 120 }
 121
 122 /*
 123  * Create a UBA SGMAP-mapped DMA map.
 124  */
 125 int
 126 uba_bus_dmamap_create_sgmap(bus_dma_tag_t t, bus_size_t size,  int nsegments,
 127         bus_size_t maxsegsz, bus_size_t boundary, int flags,
 128         bus_dmamap_t *dmamp)
 129 {
 130         bus_dmamap_t map;
 131         int error;
 132
 133         error = _bus_dmamap_create(t, size, nsegments, maxsegsz,
 134             boundary, flags, dmamp);
 135         if (error)
 136                 return (error);
 137
 138         map = *dmamp;
 139
 140         if (flags & BUS_DMA_ALLOCNOW) {
 141                 error = vax_sgmap_alloc(map, vax_round_page(size),
 142                     t->_sgmap, flags);
 143                 if (error)
 144                         uba_bus_dmamap_destroy_sgmap(t, map);
 145         }
 146
 147         return (error);
 148 }
 149
 150 /*
 151  * Destroy a UBA SGMAP-mapped DMA map.
 152  */
 153 void
 154 uba_bus_dmamap_destroy_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 155 {
 156
 157         if (map->_dm_flags & DMAMAP_HAS_SGMAP)
 158                 vax_sgmap_free(map, t->_sgmap);
 159
 160         _bus_dmamap_destroy(t, map);
 161 }
 162
 163 /*
 164  * Load a UBA SGMAP-mapped DMA map with a linear buffer.
 165  */
 166 int
 167 uba_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
 168         bus_size_t buflen, struct proc *p, int flags)
 169 {
 170         int error;
 171
 172         error = vax_sgmap_load(t, map, buf, buflen, p, flags, t->_sgmap);
 173         /*
 174          * XXX - Set up BDPs.
 175          */
 176
 177         return (error);
 178 }
 179
 180 /*
 181  * Load a UBA SGMAP-mapped DMA map with an mbuf chain.
 182  */
 183 int
 184 uba_bus_dmamap_load_mbuf_sgmap( bus_dma_tag_t t, bus_dmamap_t map,
 185         struct mbuf *m, int flags)
 186 {
 187         int error;
 188
 189         error = vax_sgmap_load_mbuf(t, map, m, flags, t->_sgmap);
 190
 191         return (error);
 192 }
 193
 194 /*
 195  * Load a UBA SGMAP-mapped DMA map with a uio.
 196  */
 197 int
 198 uba_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map,
 199         struct uio *uio, int flags)
 200 {
 201         int error;
 202
 203         error = vax_sgmap_load_uio(t, map, uio, flags, t->_sgmap);
 204
 205         return (error);
 206 }
 207
 208 /*
 209  * Load a UBA SGMAP-mapped DMA map with raw memory.
 210  */
 211 int
 212 uba_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map,
 213         bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
 214 {
 215         int error;
 216
 217         error = vax_sgmap_load_raw(t, map, segs, nsegs, size, flags,
 218             t->_sgmap);
 219
 220         return (error);
 221 }
 222
 223 /*
 224  * Unload a UBA DMA map.
 225  */
 226 void
 227 uba_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 228 {
 229         /*
 230          * Invalidate any SGMAP page table entries used by this
 231          * mapping.
 232          */
 233         vax_sgmap_unload(t, map, t->_sgmap);
 234
 235         /*
 236          * Do the generic bits of the unload.
 237          */
 238         _bus_dmamap_unload(t, map);
 239 }
 240
 241 /*
 242  * Sync the bus map. This is only needed if BDP's are used.
 243  */
 244 void
 245 uba_bus_dmamap_sync(bus_dma_tag_t tag, bus_dmamap_t dmam, bus_addr_t offset,
 246         bus_size_t len, int ops)
 247 {
 248         /* Only BDP handling, but not yet. */
 249 }