sys/arch/alpha/pci/apecs_dma.c

   1 /* $NetBSD: apecs_dma.c,v 1.17 2009/03/14 14:45:53 dsl 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>                  /* RCS ID & Copyright macro defns */
  34
  35 __KERNEL_RCSID(0, "$NetBSD: apecs_dma.c,v 1.17 2009/03/14 14:45:53 dsl Exp $");
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/device.h>
  41 #include <sys/malloc.h>
  42
  43 #include <uvm/uvm_extern.h>
  44
  45 #define _ALPHA_BUS_DMA_PRIVATE
  46 #include <machine/bus.h>
  47
  48 #include <dev/pci/pcireg.h>
  49 #include <dev/pci/pcivar.h>
  50 #include <alpha/pci/apecsreg.h>
  51 #include <alpha/pci/apecsvar.h>
  52
  53 bus_dma_tag_t apecs_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
  54
  55 int     apecs_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
  56             bus_size_t, struct proc *, int);
  57
  58 int     apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
  59             struct mbuf *, int);
  60
  61 int     apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
  62             struct uio *, int);
  63
  64 int     apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
  65             bus_dma_segment_t *, int, bus_size_t, int);
  66
  67 void    apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
  68
  69 /*
  70  * Direct-mapped window: 1G at 1G
  71  */
  72 #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024)
  73 #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024)
  74
  75 /*
  76  * SGMAP window: 8M at 8M
  77  */
  78 #define APECS_SGMAP_MAPPED_BASE (8*1024*1024)
  79 #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024)
  80
  81 /* APECS has a 256-byte out-bound DMA prefetch threshold. */
  82 #define APECS_SGMAP_PFTHRESH    256
  83
  84 /*
  85  * Macro to flush APECS scatter/gather TLB.
  86  */
  87 #define APECS_TLB_INVALIDATE() \
  88 do { \
  89         alpha_mb(); \
  90         REGVAL(EPIC_TBIA) = 0; \
  91         alpha_mb(); \
  92 } while (0)
  93
  94 void
  95 apecs_dma_init(struct apecs_config *acp)
  96 {
  97         bus_addr_t tbase;
  98         bus_dma_tag_t t;
  99
 100         /*
 101          * Initialize the DMA tag used for direct-mapped DMA.
 102          */
 103         t = &acp->ac_dmat_direct;
 104         t->_cookie = acp;
 105         t->_wbase = APECS_DIRECT_MAPPED_BASE;
 106         t->_wsize = APECS_DIRECT_MAPPED_SIZE;
 107         t->_next_window = NULL;
 108         t->_boundary = 0;
 109         t->_sgmap = NULL;
 110         t->_get_tag = apecs_dma_get_tag;
 111         t->_dmamap_create = _bus_dmamap_create;
 112         t->_dmamap_destroy = _bus_dmamap_destroy;
 113         t->_dmamap_load = _bus_dmamap_load_direct;
 114         t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
 115         t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
 116         t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
 117         t->_dmamap_unload = _bus_dmamap_unload;
 118         t->_dmamap_sync = _bus_dmamap_sync;
 119
 120         t->_dmamem_alloc = _bus_dmamem_alloc;
 121         t->_dmamem_free = _bus_dmamem_free;
 122         t->_dmamem_map = _bus_dmamem_map;
 123         t->_dmamem_unmap = _bus_dmamem_unmap;
 124         t->_dmamem_mmap = _bus_dmamem_mmap;
 125
 126         /*
 127          * Initialize the DMA tag used for sgmap-mapped DMA.
 128          */
 129         t = &acp->ac_dmat_sgmap;
 130         t->_cookie = acp;
 131         t->_wbase = APECS_SGMAP_MAPPED_BASE;
 132         t->_wsize = APECS_SGMAP_MAPPED_SIZE;
 133         t->_next_window = NULL;
 134         t->_boundary = 0;
 135         t->_sgmap = &acp->ac_sgmap;
 136         t->_pfthresh = APECS_SGMAP_PFTHRESH;
 137         t->_get_tag = apecs_dma_get_tag;
 138         t->_dmamap_create = alpha_sgmap_dmamap_create;
 139         t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
 140         t->_dmamap_load = apecs_bus_dmamap_load_sgmap;
 141         t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap;
 142         t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap;
 143         t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap;
 144         t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap;
 145         t->_dmamap_sync = _bus_dmamap_sync;
 146
 147         t->_dmamem_alloc = _bus_dmamem_alloc;
 148         t->_dmamem_free = _bus_dmamem_free;
 149         t->_dmamem_map = _bus_dmamem_map;
 150         t->_dmamem_unmap = _bus_dmamem_unmap;
 151         t->_dmamem_mmap = _bus_dmamem_mmap;
 152
 153         /*
 154          * The firmware has set up window 2 as a 1G direct-mapped DMA
 155          * window beginning at 1G.  We leave it alone.  Disable
 156          * window 1.
 157          */
 158         REGVAL(EPIC_PCI_BASE_1) = 0;
 159         alpha_mb();
 160
 161         /*
 162          * Initialize the SGMAP.
 163          */
 164         alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap",
 165             APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE,
 166             sizeof(u_int64_t), NULL, 0);
 167
 168         /*
 169          * Set up window 1 as an 8MB SGMAP-mapped window
 170          * starting at 8MB.
 171          */
 172         REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE |
 173             EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB;
 174         alpha_mb();
 175
 176         REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M;
 177         alpha_mb();
 178
 179         tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT;
 180         if ((tbase & EPIC_TBASE_T_BASE) != tbase)
 181                 panic("apecs_dma_init: bad page table address");
 182         REGVAL(EPIC_TBASE_1) = tbase;
 183         alpha_mb();
 184
 185         APECS_TLB_INVALIDATE();
 186
 187         /* XXX XXX BEGIN XXX XXX */
 188         {                                                       /* XXX */
 189                 extern paddr_t alpha_XXX_dmamap_or;             /* XXX */
 190                 alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */
 191         }                                                       /* XXX */
 192         /* XXX XXX END XXX XXX */
 193 }
 194
 195 /*
 196  * Return the bus dma tag to be used for the specified bus type.
 197  * INTERNAL USE ONLY!
 198  */
 199 bus_dma_tag_t
 200 apecs_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
 201 {
 202         struct apecs_config *acp = t->_cookie;
 203
 204         switch (bustype) {
 205         case ALPHA_BUS_PCI:
 206         case ALPHA_BUS_EISA:
 207                 /*
 208                  * Systems with an APECS can only support 1G
 209                  * of memory, so we use the direct-mapped window
 210                  * on busses that have 32-bit DMA.
 211                  */
 212                 return (&acp->ac_dmat_direct);
 213
 214         case ALPHA_BUS_ISA:
 215                 /*
 216                  * ISA doesn't have enough address bits to use
 217                  * the direct-mapped DMA window, so we must use
 218                  * SGMAPs.
 219                  */
 220                 return (&acp->ac_dmat_sgmap);
 221
 222         default:
 223                 panic("apecs_dma_get_tag: shouldn't be here, really...");
 224         }
 225 }
 226
 227 /*
 228  * Load an APECS SGMAP-mapped DMA map with a linear buffer.
 229  */
 230 int
 231 apecs_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
 232 {
 233         int error;
 234
 235         error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
 236             t->_sgmap);
 237         if (error == 0)
 238                 APECS_TLB_INVALIDATE();
 239
 240         return (error);
 241 }
 242
 243 /*
 244  * Load an APECS SGMAP-mapped DMA map with an mbuf chain.
 245  */
 246 int
 247 apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
 248 {
 249         int error;
 250
 251         error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
 252         if (error == 0)
 253                 APECS_TLB_INVALIDATE();
 254
 255         return (error);
 256 }
 257
 258 /*
 259  * Load an APECS SGMAP-mapped DMA map with a uio.
 260  */
 261 int
 262 apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
 263 {
 264         int error;
 265
 266         error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
 267         if (error == 0)
 268                 APECS_TLB_INVALIDATE();
 269
 270         return (error);
 271 }
 272
 273 /*
 274  * Load an APECS SGMAP-mapped DMA map with raw memory.
 275  */
 276 int
 277 apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
 278 {
 279         int error;
 280
 281         error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
 282             t->_sgmap);
 283         if (error == 0)
 284                 APECS_TLB_INVALIDATE();
 285
 286         return (error);
 287 }
 288
 289 /*
 290  * Unload an APECS DMA map.
 291  */
 292 void
 293 apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 294 {
 295
 296         /*
 297          * Invalidate any SGMAP page table entries used by this
 298          * mapping.
 299          */
 300         pci_sgmap_pte64_unload(t, map, t->_sgmap);
 301         APECS_TLB_INVALIDATE();
 302
 303         /*
 304          * Do the generic bits of the unload.
 305          */
 306         _bus_dmamap_unload(t, map);
 307 }