sys/dev/qbus/if_uba.c

   1 /*      $NetBSD: if_uba.c,v 1.29 2007/10/19 12:01:09 ad Exp $   */
   2
   3 /*
   4  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)if_uba.c    7.16 (Berkeley) 12/16/90
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __KERNEL_RCSID(0, "$NetBSD: if_uba.c,v 1.29 2007/10/19 12:01:09 ad Exp $");
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42 #include <sys/device.h>
  43
  44 #include <uvm/uvm_extern.h>
  45
  46 #include <net/if.h>
  47
  48 #include <sys/bus.h>
  49
  50 #include <dev/qbus/if_uba.h>
  51 #include <dev/qbus/ubareg.h>
  52 #include <dev/qbus/ubavar.h>
  53
  54 static  struct mbuf *getmcl(void);
  55
  56 /*
  57  * Routines supporting UNIBUS network interfaces.
  58  *
  59  * TODO:
  60  *      Support interfaces using only one BDP statically.
  61  */
  62
  63 /*
  64  * Init UNIBUS for interface whose headers of size hlen are to
  65  * end on a page boundary.  We allocate a UNIBUS map register for the page
  66  * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
  67  * doing this once for each read and once for each write buffer.  We also
  68  * allocate page frames in the mbuffer pool for these pages.
  69  *
  70  * Recent changes:
  71  *      No special "header pages" anymore.
  72  *      Recv packets are always put in clusters.
  73  *      "size" is the maximum buffer size, may not be bigger than MCLBYTES.
  74  */
  75 int
  76 if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
  77     struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
  78 {
  79         struct mbuf *m;
  80         int totsz, i, error, rseg, nm = nr;
  81         bus_dma_segment_t seg;
  82         void *vaddr;
  83
  84 #ifdef DIAGNOSTIC
  85         if (size > MCLBYTES)
  86                 panic("if_ubaminit: size > MCLBYTES");
  87 #endif
  88         ifu->iff_softc = uh;
  89         /*
  90          * Get DMA memory for transmit buffers.
  91          * Buffer size are rounded up to a multiple of the uba page size,
  92          * then allocated contiguous.
  93          */
  94         size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
  95         totsz = size * nw;
  96         if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, PAGE_SIZE, 0,
  97             &seg, 1, &rseg, BUS_DMA_NOWAIT)))
  98                 return error;
  99         if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
 100             BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
 101                 bus_dmamem_free(uh->uh_dmat, &seg, rseg);
 102                 return error;
 103         }
 104
 105         /*
 106          * Create receive and transmit maps.
 107          * Alloc all resources now so we won't fail in the future.
 108          */
 109
 110         for (i = 0; i < nr; i++) {
 111                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
 112                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
 113                     &ifr[i].ifrw_map))) {
 114                         nr = i;
 115                         nm = nw = 0;
 116                         goto bad;
 117                 }
 118         }
 119         for (i = 0; i < nw; i++) {
 120                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
 121                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
 122                     &ifw[i].ifw_map))) {
 123                         nw = i;
 124                         nm = 0;
 125                         goto bad;
 126                 }
 127         }
 128         /*
 129          * Preload the rx maps with mbuf clusters.
 130          */
 131         for (i = 0; i < nm; i++) {
 132                 if ((m = getmcl()) == NULL) {
 133                         nm = i;
 134                         goto bad;
 135                 }
 136                 ifr[i].ifrw_mbuf = m;
 137                 bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
 138                     m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
 139
 140         }
 141         /*
 142          * Load the tx maps with DMA memory (common case).
 143          */
 144         for (i = 0; i < nw; i++) {
 145                 ifw[i].ifw_vaddr = (char *)vaddr + size * i;
 146                 ifw[i].ifw_size = size;
 147                 bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map,
 148                     ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
 149         }
 150         return 0;
 151 bad:
 152         while (--nm >= 0) {
 153                 bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
 154                 m_freem(ifr[nm].ifrw_mbuf);
 155         }
 156         while (--nw >= 0)
 157                 bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
 158         while (--nr >= 0)
 159                 bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
 160         return (0);
 161 }
 162
 163 struct mbuf *
 164 getmcl(void)
 165 {
 166         struct mbuf *m;
 167
 168         MGETHDR(m, M_DONTWAIT, MT_DATA);
 169         if (m == NULL)
 170                 return 0;
 171         MCLGET(m, M_DONTWAIT);
 172         if ((m->m_flags & M_EXT) == 0) {
 173                 m_freem(m);
 174                 return 0;
 175         }
 176         return m;
 177 }
 178
 179 /*
 180  * Pull read data off a interface.
 181  * Totlen is length of data, with local net header stripped.
 182  * When full cluster sized units are present
 183  * on the interface on cluster boundaries we can get them more
 184  * easily by remapping, and take advantage of this here.
 185  * Save a pointer to the interface structure and the total length,
 186  * so that protocols can determine where incoming packets arrived.
 187  * Note: we may be called to receive from a transmit buffer by some
 188  * devices.  In that case, we must force normal mapping of the buffer,
 189  * so that the correct data will appear (only unibus maps are
 190  * changed when remapping the transmit buffers).
 191  */
 192 struct mbuf *
 193 if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
 194 {
 195         struct uba_softc *uh = ifu->iff_softc;
 196         struct mbuf *m, *mn;
 197
 198         if ((mn = getmcl()) == NULL)
 199                 return NULL;    /* Leave the old */
 200
 201         bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
 202         m = ifr->ifrw_mbuf;
 203         ifr->ifrw_mbuf = mn;
 204         if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
 205             mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
 206                 panic("if_ubaget"); /* Cannot happen */
 207         m->m_pkthdr.rcvif = ifp;
 208         m->m_len = m->m_pkthdr.len = len;
 209         return m;
 210 }
 211
 212 /*
 213  * Called after a packet is sent. Releases hold resources.
 214  */
 215 void
 216 if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
 217 {
 218         struct uba_softc *uh = ifu->iff_softc;
 219
 220         if (ifw->ifw_flags & IFRW_MBUF) {
 221                 bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
 222                 m_freem(ifw->ifw_mbuf);
 223                 ifw->ifw_mbuf = NULL;
 224         }
 225 }
 226
 227 /*
 228  * Map a chain of mbufs onto a network interface
 229  * in preparation for an i/o operation.
 230  * The argument chain of mbufs includes the local network
 231  * header which is copied to be in the mapped, aligned
 232  * i/o space.
 233  */
 234 int
 235 if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
 236 {
 237         struct uba_softc *uh = ifu->iff_softc;
 238         int len;
 239
 240         if (/* m->m_next ==*/ 0) {
 241                 /*
 242                  * Map the outgoing packet directly.
 243                  */
 244                 if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
 245                         bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
 246                         ifw->ifw_flags |= IFRW_MBUF;
 247                 }
 248                 bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
 249                     m->m_len, NULL, BUS_DMA_NOWAIT);
 250                 ifw->ifw_mbuf = m;
 251                 len = m->m_len;
 252         } else {
 253                 if (ifw->ifw_flags & IFRW_MBUF) {
 254                         bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
 255                             ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
 256                         ifw->ifw_flags &= ~IFRW_MBUF;
 257                 }
 258                 len = m->m_pkthdr.len;
 259                 m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
 260                 m_freem(m);
 261         }
 262         return len;
 263 }