sys/arch/vax/vsa/vsbus_dma.c

   1 /* $NetBSD: vsbus_dma.c,v 1.14 2008/03/11 05:34:03 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: vsbus_dma.c,v 1.14 2008/03/11 05:34:03 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/sid.h>
  47 #include <machine/sgmap.h>
  48 #include <machine/vsbus.h>
  49
  50 static int sgmap_bus_dmamap_create_sgmap(bus_dma_tag_t, bus_size_t, int,
  51             bus_size_t, bus_size_t, int, bus_dmamap_t *);
  52
  53 static void sgmap_bus_dmamap_destroy_sgmap(bus_dma_tag_t, bus_dmamap_t);
  54
  55 static int sgmap_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
  56             bus_size_t, struct proc *, int);
  57
  58 static int sgmap_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
  59             struct mbuf *, int);
  60
  61 static int sgmap_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
  62             struct uio *, int);
  63
  64 static int sgmap_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
  65             bus_dma_segment_t *, int, bus_size_t, int);
  66
  67 static void sgmap_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
  68
  69 static void sgmap_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
  70             bus_size_t, int);
  71
  72 void
  73 vax_sgmap_dmatag_init(bus_dma_tag_t t, void *cookie, size_t ptecnt)
  74 {
  75         /*
  76          * Initialize the DMA tag used for sgmap-mapped DMA.
  77          */
  78         t->_cookie = cookie;
  79         t->_wbase = 0;
  80         t->_wsize = ptecnt * VAX_NBPG;
  81         t->_boundary = 0;
  82         t->_dmamap_create = sgmap_bus_dmamap_create_sgmap;
  83         t->_dmamap_destroy = sgmap_bus_dmamap_destroy_sgmap;
  84         t->_dmamap_load = sgmap_bus_dmamap_load_sgmap;
  85         t->_dmamap_load_mbuf = sgmap_bus_dmamap_load_mbuf_sgmap;
  86         t->_dmamap_load_uio = sgmap_bus_dmamap_load_uio_sgmap;
  87         t->_dmamap_load_raw = sgmap_bus_dmamap_load_raw_sgmap;
  88         t->_dmamap_unload = sgmap_bus_dmamap_unload_sgmap;
  89         t->_dmamap_sync = sgmap_bus_dmamap_sync;
  90
  91         t->_dmamem_alloc = _bus_dmamem_alloc;
  92         t->_dmamem_free = _bus_dmamem_free;
  93         t->_dmamem_map = _bus_dmamem_map;
  94         t->_dmamem_unmap = _bus_dmamem_unmap;
  95         t->_dmamem_mmap = _bus_dmamem_mmap;
  96 }
  97
  98 void
  99 vsbus_dma_init(struct vsbus_softc *sc, unsigned ptecnt)
 100 {
 101         bus_dma_tag_t t = &sc->sc_dmatag;
 102         bus_dma_segment_t segs[1];
 103         struct pte *pte;
 104         int nsegs;
 105         int error;
 106         size_t mapsize = ptecnt * sizeof(struct pte);
 107
 108         vax_sgmap_dmatag_init(t, sc, ptecnt);
 109
 110         t->_sgmap = &sc->sc_sgmap;
 111
 112         if (vax_boardtype == VAX_BTYP_46 || vax_boardtype == VAX_BTYP_48) {
 113                 /*
 114                  * Allocate and map the VS4000 scatter gather map.
 115                  */
 116                 error = bus_dmamem_alloc(t, mapsize, mapsize, mapsize,
 117                     segs, 1, &nsegs, BUS_DMA_NOWAIT);
 118                 if (error) {
 119                         panic("vsbus_dma_init: error allocating memory for "
 120                             "hw sgmap: error=%d", error);
 121                 }
 122
 123                 error = bus_dmamem_map(t, segs, nsegs, mapsize,
 124                    (void **)(void *) &pte, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
 125                 if (error) {
 126                         panic("vsbus_dma_init: error mapping memory for "
 127                             "hw sgmap: error=%d", error);
 128                 }
 129                 memset(pte, 0, mapsize);
 130                 *(int *) (sc->sc_vsregs + 8) = segs->ds_addr;   /* set MAP BASE 0x2008008 */
 131         } else {
 132                 pte = (struct pte *) vax_map_physmem(KA49_SCSIMAP, mapsize / VAX_NBPG);
 133                 for (nsegs = ptecnt; nsegs > 0; ) {
 134                         ((uint32_t *) pte)[--nsegs] = 0;
 135                 }
 136                 segs->ds_addr = KA49_SCSIMAP;
 137         }
 138         aprint_normal_dev(sc->sc_dev,
 139             "%uK entry DMA SGMAP at PA 0x%lx (VA %p)\n",
 140             ptecnt / 1024, segs->ds_addr, pte);
 141
 142         /*
 143          * Initialize the SGMAP.
 144          */
 145         vax_sgmap_init(t, &sc->sc_sgmap, "vsbus_sgmap", t->_wbase, t->_wsize, pte, 0);
 146
 147 }
 148
 149 /*
 150  * Create a VSBUS SGMAP-mapped DMA map.
 151  */
 152 int
 153 sgmap_bus_dmamap_create_sgmap(bus_dma_tag_t t, bus_size_t size,  int nsegments,
 154         bus_size_t maxsegsz, bus_size_t boundary, int flags,
 155         bus_dmamap_t *dmamp)
 156 {
 157         bus_dmamap_t map;
 158         int error;
 159
 160         error = _bus_dmamap_create(t, size, nsegments, maxsegsz,
 161             boundary, flags, dmamp);
 162         if (error)
 163                 return (error);
 164
 165         map = *dmamp;
 166
 167         if (flags & BUS_DMA_ALLOCNOW) {
 168                 error = vax_sgmap_alloc(map, vax_round_page(size),
 169                     t->_sgmap, flags);
 170                 if (error)
 171                         sgmap_bus_dmamap_destroy_sgmap(t, map);
 172         }
 173
 174         return (error);
 175 }
 176
 177 /*
 178  * Destroy a VSBUS SGMAP-mapped DMA map.
 179  */
 180 static void
 181 sgmap_bus_dmamap_destroy_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 182 {
 183
 184         if (map->_dm_flags & DMAMAP_HAS_SGMAP)
 185                 vax_sgmap_free(map, t->_sgmap);
 186
 187         _bus_dmamap_destroy(t, map);
 188 }
 189
 190 /*
 191  * Load a VSBUS SGMAP-mapped DMA map with a linear buffer.
 192  */
 193 static int
 194 sgmap_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
 195         bus_size_t buflen, struct proc *p, int flags)
 196 {
 197         return vax_sgmap_load(t, map, buf, buflen, p, flags, t->_sgmap);
 198 }
 199
 200 /*
 201  * Load a VSBUS SGMAP-mapped DMA map with an mbuf chain.
 202  */
 203 static int
 204 sgmap_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map,
 205         struct mbuf *m, int flags)
 206 {
 207         return vax_sgmap_load_mbuf(t, map, m, flags, t->_sgmap);
 208 }
 209
 210 /*
 211  * Load a VSBUS SGMAP-mapped DMA map with a uio.
 212  */
 213 static int
 214 sgmap_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map,
 215         struct uio *uio, int flags)
 216 {
 217         return vax_sgmap_load_uio(t, map, uio, flags, t->_sgmap);
 218 }
 219
 220 /*
 221  * Load a VSBUS SGMAP-mapped DMA map with raw memory.
 222  */
 223 static int
 224 sgmap_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map,
 225         bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
 226 {
 227         return vax_sgmap_load_raw(t, map, segs, nsegs, size, flags, t->_sgmap);
 228 }
 229
 230 /*
 231  * Unload a VSBUS DMA map.
 232  */
 233 static void
 234 sgmap_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 235 {
 236         /*
 237          * Invalidate any SGMAP page table entries used by this
 238          * mapping.
 239          */
 240         vax_sgmap_unload(t, map, t->_sgmap);
 241
 242         /*
 243          * Do the generic bits of the unload.
 244          */
 245         _bus_dmamap_unload(t, map);
 246 }
 247
 248 /*
 249  * Sync the bus map.
 250  */
 251 static void
 252 sgmap_bus_dmamap_sync(bus_dma_tag_t tag, bus_dmamap_t dmam, bus_addr_t offset,
 253         bus_size_t len, int ops)
 254 {
 255         /* not needed */
 256 }