sys/arch/alpha/pci/tsp_dma.c

   1 /* $NetBSD: tsp_dma.c,v 1.8 2009/03/14 14:45:53 dsl Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1999 by Ross Harvey.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by Ross Harvey.
  17  * 4. The name of Ross Harvey may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY ROSS HARVEY ``AS IS'' AND ANY EXPRESS
  21  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURP0SE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL ROSS HARVEY BE LIABLE FOR ANY
  24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*-
  35  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
  36  * All rights reserved.
  37  *
  38  * This code is derived from software contributed to The NetBSD Foundation
  39  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
  40  * NASA Ames Research Center.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  52  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  53  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  54  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  55  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  56  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  57  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  58  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  59  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  60  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  61  * POSSIBILITY OF SUCH DAMAGE.
  62  */
  63
  64 #include <sys/cdefs.h>
  65 __KERNEL_RCSID(0, "$NetBSD: tsp_dma.c,v 1.8 2009/03/14 14:45:53 dsl Exp $");
  66
  67 #include <sys/param.h>
  68 #include <sys/systm.h>
  69 #include <sys/kernel.h>
  70 #include <sys/device.h>
  71 #include <sys/malloc.h>
  72
  73 #include <uvm/uvm_extern.h>
  74
  75 #include <machine/autoconf.h>
  76 #define _ALPHA_BUS_DMA_PRIVATE
  77 #include <machine/bus.h>
  78 #include <machine/rpb.h>
  79
  80 #include <dev/pci/pcireg.h>
  81 #include <dev/pci/pcivar.h>
  82 #include <alpha/pci/tsreg.h>
  83 #include <alpha/pci/tsvar.h>
  84
  85 #define tsp_dma() { Generate ctags(1) key. }
  86
  87 #define EDIFF(a, b) (((a) | WSBA_ENA | WSBA_SG) != ((b) | WSBA_ENA | WSBA_SG))
  88
  89 bus_dma_tag_t tsp_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
  90
  91 int     tsp_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
  92             bus_size_t, struct proc *, int);
  93
  94 int     tsp_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
  95             struct mbuf *, int);
  96
  97 int     tsp_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
  98             struct uio *, int);
  99
 100 int     tsp_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
 101             bus_dma_segment_t *, int, bus_size_t, int);
 102
 103 void    tsp_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
 104
 105 void    tsp_tlb_invalidate(struct tsp_config *);
 106
 107 /*
 108  * XXX Need to figure out what this is, if any.  Initialize it to
 109  * XXX something that should be safe.
 110  */
 111 #define TSP_SGMAP_PFTHRESH      256
 112
 113 void
 114 tsp_dma_init(struct tsp_config *pcp)
 115 {
 116         int i;
 117         bus_dma_tag_t t;
 118         struct ts_pchip *pccsr = pcp->pc_csr;
 119         bus_addr_t dwbase, dwlen, sgwbase, sgwlen, tbase;
 120         static struct map_expected {
 121                 u_int32_t base, mask, enables;
 122         } premap[4] = {
 123                 { 0x800000,                0x700000, WSBA_ENA | WSBA_SG },
 124                 { 0x80000000 | WSBA_ENA, 0x3ff00000, WSBA_ENA           },
 125                 { 0, 0 },
 126                 { 0, 0 }
 127         };
 128
 129         alpha_mb();
 130         for(i = 0; i < 4; ++i) {
 131                 if (EDIFF(pccsr->tsp_wsba[i].tsg_r, premap[i].base) ||
 132                     EDIFF(pccsr->tsp_wsm[i].tsg_r, premap[i].mask))
 133                         printf("tsp%d: window %d: %lx/base %lx/mask %lx"
 134                             " reinitialized\n",
 135                             pcp->pc_pslot, i,
 136                             pccsr->tsp_wsba[i].tsg_r,
 137                             pccsr->tsp_wsm[i].tsg_r,
 138                             pccsr->tsp_tba[i].tsg_r);
 139                 pccsr->tsp_wsba[i].tsg_r = premap[i].base | premap[i].enables;
 140                 pccsr->tsp_wsm[i].tsg_r = premap[i].mask;
 141         }
 142         alpha_mb();
 143
 144         /*
 145          * Initialize the DMA tag used for direct-mapped DMA.
 146          */
 147         t = &pcp->pc_dmat_direct;
 148         t->_cookie = pcp;
 149         t->_wbase = dwbase = WSBA_ADDR(pccsr->tsp_wsba[1].tsg_r);
 150         t->_wsize = dwlen = WSM_LEN(pccsr->tsp_wsm[1].tsg_r);
 151         t->_next_window = &pcp->pc_dmat_sgmap;
 152         t->_boundary = 0;
 153         t->_sgmap = NULL;
 154         t->_get_tag = tsp_dma_get_tag;
 155         t->_dmamap_create = _bus_dmamap_create;
 156         t->_dmamap_destroy = _bus_dmamap_destroy;
 157         t->_dmamap_load = _bus_dmamap_load_direct;
 158         t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
 159         t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
 160         t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
 161         t->_dmamap_unload = _bus_dmamap_unload;
 162         t->_dmamap_sync = _bus_dmamap_sync;
 163
 164         t->_dmamem_alloc = _bus_dmamem_alloc;
 165         t->_dmamem_free = _bus_dmamem_free;
 166         t->_dmamem_map = _bus_dmamem_map;
 167         t->_dmamem_unmap = _bus_dmamem_unmap;
 168         t->_dmamem_mmap = _bus_dmamem_mmap;
 169
 170         /*
 171          * Initialize the DMA tag used for sgmap-mapped DMA.
 172          */
 173         t = &pcp->pc_dmat_sgmap;
 174         t->_cookie = pcp;
 175         t->_wbase = sgwbase = WSBA_ADDR(pccsr->tsp_wsba[0].tsg_r);
 176         t->_wsize = sgwlen = WSM_LEN(pccsr->tsp_wsm[0].tsg_r);
 177         t->_next_window = NULL;
 178         t->_boundary = 0;
 179         t->_sgmap = &pcp->pc_sgmap;
 180         t->_pfthresh = TSP_SGMAP_PFTHRESH;
 181         t->_get_tag = tsp_dma_get_tag;
 182         t->_dmamap_create = alpha_sgmap_dmamap_create;
 183         t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
 184         t->_dmamap_load = tsp_bus_dmamap_load_sgmap;
 185         t->_dmamap_load_mbuf = tsp_bus_dmamap_load_mbuf_sgmap;
 186         t->_dmamap_load_uio = tsp_bus_dmamap_load_uio_sgmap;
 187         t->_dmamap_load_raw = tsp_bus_dmamap_load_raw_sgmap;
 188         t->_dmamap_unload = tsp_bus_dmamap_unload_sgmap;
 189         t->_dmamap_sync = _bus_dmamap_sync;
 190
 191         t->_dmamem_alloc = _bus_dmamem_alloc;
 192         t->_dmamem_free = _bus_dmamem_free;
 193         t->_dmamem_map = _bus_dmamem_map;
 194         t->_dmamem_unmap = _bus_dmamem_unmap;
 195         t->_dmamem_mmap = _bus_dmamem_mmap;
 196
 197         /*
 198          * Initialize the SGMAP.  Align page table to 32k in case
 199          * window is somewhat larger than expected.
 200          */
 201         alpha_sgmap_init(t, &pcp->pc_sgmap, "tsp_sgmap",
 202             sgwbase, 0, sgwlen, sizeof(u_int64_t), NULL, (32*1024));
 203
 204         /*
 205          * Enable window 0 and enable SG PTE mapping.
 206          */
 207         alpha_mb();
 208         pccsr->tsp_wsba[0].tsg_r |= WSBA_SG | WSBA_ENA;
 209         alpha_mb();
 210
 211         /*
 212          * Check windows for sanity, especially if we later decide to
 213          * use the firmware's initialization in some cases.
 214          */
 215         if ((sgwbase <= dwbase && dwbase < sgwbase + sgwlen) ||
 216             (dwbase <= sgwbase && sgwbase < dwbase + dwlen))
 217                 panic("tsp_dma_init: overlap");
 218
 219         tbase = pcp->pc_sgmap.aps_ptpa;
 220         if (tbase & ~0x7fffffc00UL)
 221                 panic("tsp_dma_init: bad page table address");
 222         alpha_mb();
 223         pccsr->tsp_tba[0].tsg_r = tbase;
 224         alpha_mb();
 225
 226         tsp_tlb_invalidate(pcp);
 227         alpha_mb();
 228
 229         /* XXX XXX BEGIN XXX XXX */
 230         {                                                       /* XXX */
 231                 extern paddr_t alpha_XXX_dmamap_or;             /* XXX */
 232                 alpha_XXX_dmamap_or = dwbase;                   /* XXX */
 233         }                                                       /* XXX */
 234         /* XXX XXX END XXX XXX */
 235 }
 236
 237 /*
 238  * Return the bus dma tag to be used for the specified bus type.
 239  * INTERNAL USE ONLY!
 240  */
 241 bus_dma_tag_t
 242 tsp_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
 243 {
 244         struct tsp_config *pcp = t->_cookie;
 245
 246         switch (bustype) {
 247         case ALPHA_BUS_PCI:
 248         case ALPHA_BUS_EISA:
 249                 /*
 250                  * The direct mapped window will work for most systems,
 251                  * most of the time. When it doesn't, we chain to the sgmap
 252                  * window automatically.
 253                  */
 254                 return (&pcp->pc_dmat_direct);
 255
 256         case ALPHA_BUS_ISA:
 257                 /*
 258                  * ISA doesn't have enough address bits to use
 259                  * the direct-mapped DMA window, so we must use
 260                  * SGMAPs.
 261                  */
 262                 return (&pcp->pc_dmat_sgmap);
 263
 264         default:
 265                 panic("tsp_dma_get_tag: shouldn't be here, really...");
 266         }
 267 }
 268
 269 /*
 270  * Load a TSP SGMAP-mapped DMA map with a linear buffer.
 271  */
 272 int
 273 tsp_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
 274 {
 275         int error;
 276
 277         error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
 278             t->_sgmap);
 279         if (error == 0)
 280                 tsp_tlb_invalidate(t->_cookie);
 281
 282         return (error);
 283 }
 284
 285 /*
 286  * Load a TSP SGMAP-mapped DMA map with an mbuf chain.
 287  */
 288 int
 289 tsp_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
 290 {
 291         int error;
 292
 293         error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
 294         if (error == 0)
 295                 tsp_tlb_invalidate(t->_cookie);
 296
 297         return (error);
 298 }
 299
 300 /*
 301  * Load a TSP SGMAP-mapped DMA map with a uio.
 302  */
 303 int
 304 tsp_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
 305 {
 306         int error;
 307
 308         error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
 309         if (error == 0)
 310                 tsp_tlb_invalidate(t->_cookie);
 311
 312         return (error);
 313 }
 314
 315 /*
 316  * Load a TSP SGMAP-mapped DMA map with raw memory.
 317  */
 318 int
 319 tsp_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)
 320 {
 321         int error;
 322
 323         error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
 324             t->_sgmap);
 325         if (error == 0)
 326                 tsp_tlb_invalidate(t->_cookie);
 327
 328         return (error);
 329 }
 330
 331 /*
 332  * Unload a TSP DMA map.
 333  */
 334 void
 335 tsp_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
 336 {
 337
 338         /*
 339          * Invalidate any SGMAP page table entries used by this
 340          * mapping.
 341          */
 342         pci_sgmap_pte64_unload(t, map, t->_sgmap);
 343         tsp_tlb_invalidate(t->_cookie);
 344
 345         /*
 346          * Do the generic bits of the unload.
 347          */
 348         _bus_dmamap_unload(t, map);
 349 }
 350
 351 /*
 352  * Flush the TSP scatter/gather TLB.
 353  */
 354 void
 355 tsp_tlb_invalidate(struct tsp_config *pcp)
 356 {
 357
 358         alpha_mb();
 359         pcp->pc_csr->tsp_tlbia.tsg_r = 0;
 360         alpha_mb();
 361 }