sys/arch/amiga/dev/atzsc.c

   1 /*      $NetBSD: atzsc.c,v 1.38 2008/06/13 08:13:37 cegger Exp $ */
   2
   3 /*
   4  * Copyright (c) 1982, 1990 The 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  *      @(#)dma.c
  32  */
  33
  34 /*
  35  * Copyright (c) 1994 Christian E. Hopps
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)dma.c
  66  */
  67
  68 #include <sys/cdefs.h>
  69 __KERNEL_RCSID(0, "$NetBSD: atzsc.c,v 1.38 2008/06/13 08:13:37 cegger Exp $");
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/kernel.h>
  74 #include <sys/device.h>
  75 #include <sys/intr.h>
  76 #include <dev/scsipi/scsi_all.h>
  77 #include <dev/scsipi/scsipi_all.h>
  78 #include <dev/scsipi/scsiconf.h>
  79 #include <amiga/amiga/custom.h>
  80 #include <amiga/amiga/cc.h>
  81 #include <amiga/amiga/device.h>
  82 #include <amiga/amiga/isr.h>
  83 #include <amiga/dev/dmavar.h>
  84 #include <amiga/dev/sbicreg.h>
  85 #include <amiga/dev/sbicvar.h>
  86 #include <amiga/dev/atzscreg.h>
  87 #include <amiga/dev/zbusvar.h>
  88
  89 void atzscattach(struct device *, struct device *, void *);
  90 int atzscmatch(struct device *, struct cfdata *, void *);
  91
  92 void atzsc_enintr(struct sbic_softc *);
  93 void atzsc_dmastop(struct sbic_softc *);
  94 int atzsc_dmanext(struct sbic_softc *);
  95 int atzsc_dmaintr(void *);
  96 int atzsc_dmago(struct sbic_softc *, char *, int, int);
  97
  98 #ifdef DEBUG
  99 void atzsc_dump(void);
 100 #endif
 101
 102 #ifdef DEBUG
 103 int     atzsc_dmadebug = 0;
 104 #endif
 105
 106 CFATTACH_DECL(atzsc, sizeof(struct sbic_softc),
 107     atzscmatch, atzscattach, NULL, NULL);
 108
 109 /*
 110  * if we are an A3000 we are here.
 111  */
 112 int
 113 atzscmatch(struct device *pdp, struct cfdata *cfp, void *auxp)
 114 {
 115         struct zbus_args *zap;
 116
 117         zap = auxp;
 118
 119         /*
 120          * Check manufacturer and product id.
 121          * I was informed that older boards can be 2 also.
 122          */
 123         if (zap->manid == 514 && (zap->prodid == 3 || zap->prodid == 2))
 124                 return(1);
 125         else
 126                 return(0);
 127 }
 128
 129 void
 130 atzscattach(struct device *pdp, struct device *dp, void *auxp)
 131 {
 132         volatile struct sdmac *rp;
 133         struct sbic_softc *sc = (struct sbic_softc *)dp;
 134         struct zbus_args *zap;
 135         struct scsipi_adapter *adapt = &sc->sc_adapter;
 136         struct scsipi_channel *chan = &sc->sc_channel;
 137
 138         zap = auxp;
 139
 140         sc->sc_cregs = rp = zap->va;
 141         /*
 142          * disable ints and reset bank register
 143          */
 144         rp->CNTR = CNTR_PDMD;
 145         rp->DAWR = DAWR_ATZSC;
 146         sc->sc_enintr = atzsc_enintr;
 147         sc->sc_dmago = atzsc_dmago;
 148         sc->sc_dmanext = atzsc_dmanext;
 149         sc->sc_dmastop = atzsc_dmastop;
 150         sc->sc_dmacmd = 0;
 151
 152         /*
 153          * only 24 bit mem.
 154          */
 155         sc->sc_flags |= SBICF_BADDMA;
 156         sc->sc_dmamask = ~0x00ffffff;
 157 #if 0
 158         /*
 159          * If the users kva space is not ztwo try and allocate a bounce buffer.
 160          * XXX this needs to change if we move to multiple memory segments.
 161          */
 162         if (kvtop(sc) & sc->sc_dmamask) {
 163                 sc->sc_dmabuffer = (char *)alloc_z2mem(MAXPHYS * 8); /* XXX */
 164                 if (isztwomem(sc->sc_dmabuffer))
 165                         printf(" bounce pa 0x%x", kvtop(sc->sc_dmabuffer));
 166                 else if (sc->sc_dmabuffer)
 167                         printf(" bounce pa 0x%x",
 168                             PREP_DMA_MEM(sc->sc_dmabuffer));
 169         }
 170 #endif
 171         sc->sc_sbic.sbic_asr_p = (volatile unsigned char *)rp + 0x91;
 172         sc->sc_sbic.sbic_value_p = (volatile unsigned char *)rp + 0x93;
 173
 174         sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 77;
 175
 176         printf(": dmamask 0x%lx\n", ~sc->sc_dmamask);
 177
 178         /*
 179          * Fill in the scsipi_adapter.
 180          */
 181         memset(adapt, 0, sizeof(*adapt));
 182         adapt->adapt_dev = &sc->sc_dev;
 183         adapt->adapt_nchannels = 1;
 184         adapt->adapt_openings = 7;
 185         adapt->adapt_max_periph = 1;
 186         adapt->adapt_request = sbic_scsipi_request;
 187         adapt->adapt_minphys = sbic_minphys;
 188
 189         /*
 190          * Fill in the scsipi_channel.
 191          */
 192         memset(chan, 0, sizeof(*chan));
 193         chan->chan_adapter = adapt;
 194         chan->chan_bustype = &scsi_bustype;
 195         chan->chan_channel = 0;
 196         chan->chan_ntargets = 8;
 197         chan->chan_nluns = 8;
 198         chan->chan_id = 7;
 199
 200         sbicinit(sc);
 201
 202         sc->sc_isr.isr_intr = atzsc_dmaintr;
 203         sc->sc_isr.isr_arg = sc;
 204         sc->sc_isr.isr_ipl = 2;
 205         add_isr (&sc->sc_isr);
 206
 207         /*
 208          * attach all scsi units on us
 209          */
 210         config_found(dp, chan, scsiprint);
 211 }
 212
 213 void
 214 atzsc_enintr(struct sbic_softc *dev)
 215 {
 216         volatile struct sdmac *sdp;
 217
 218         sdp = dev->sc_cregs;
 219
 220         dev->sc_flags |= SBICF_INTR;
 221         sdp->CNTR = CNTR_PDMD | CNTR_INTEN;
 222 }
 223
 224 int
 225 atzsc_dmago(struct sbic_softc *dev, char *addr, int count, int flags)
 226 {
 227         volatile struct sdmac *sdp;
 228
 229         sdp = dev->sc_cregs;
 230         /*
 231          * Set up the command word based on flags
 232          */
 233         dev->sc_dmacmd = CNTR_PDMD | CNTR_INTEN;
 234         if ((flags & DMAGO_READ) == 0)
 235                 dev->sc_dmacmd |= CNTR_DDIR;
 236 #ifdef DEBUG
 237         if (atzsc_dmadebug & DDB_IO)
 238                 printf("atzsc_dmago: cmd %x\n", dev->sc_dmacmd);
 239 #endif
 240
 241         dev->sc_flags |= SBICF_INTR;
 242         sdp->CNTR = dev->sc_dmacmd;
 243         sdp->ACR = (u_int) dev->sc_cur->dc_addr;
 244         sdp->ST_DMA = 1;
 245
 246         return(dev->sc_tcnt);
 247 }
 248
 249 void
 250 atzsc_dmastop(struct sbic_softc *dev)
 251 {
 252         volatile struct sdmac *sdp;
 253         int s;
 254
 255         sdp = dev->sc_cregs;
 256
 257 #ifdef DEBUG
 258         if (atzsc_dmadebug & DDB_FOLLOW)
 259                 printf("atzsc_dmastop()\n");
 260 #endif
 261         if (dev->sc_dmacmd) {
 262                 s = splbio();
 263                 if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) {
 264                         /*
 265                          * only FLUSH if terminal count not enabled,
 266                          * and reading from peripheral
 267                          */
 268                         sdp->FLUSH = 1;
 269                         while ((sdp->ISTR & ISTR_FE_FLG) == 0)
 270                                 ;
 271                 }
 272                 /*
 273                  * clear possible interrupt and stop DMA
 274                  */
 275                 sdp->CINT = 1;
 276                 sdp->SP_DMA = 1;
 277                 dev->sc_dmacmd = 0;
 278                 splx(s);
 279         }
 280 }
 281
 282 int
 283 atzsc_dmaintr(void *arg)
 284 {
 285         struct sbic_softc *dev = arg;
 286         volatile struct sdmac *sdp;
 287         int stat, found;
 288
 289         sdp = dev->sc_cregs;
 290         stat = sdp->ISTR;
 291
 292         if ((stat & (ISTR_INT_F|ISTR_INT_P)) == 0)
 293                 return (0);
 294
 295 #ifdef DEBUG
 296         if (atzsc_dmadebug & DDB_FOLLOW)
 297                 printf("%s: dmaintr 0x%x\n", dev->sc_dev.dv_xname, stat);
 298 #endif
 299
 300         /*
 301          * both, SCSI and DMA interrupts arrive here. I chose
 302          * arbitrarily that DMA interrupts should have higher
 303          * precedence than SCSI interrupts.
 304          */
 305         found = 0;
 306         if (stat & ISTR_E_INT) {
 307                 found++;
 308
 309                 sdp->CINT = 1;  /* clear possible interrupt */
 310
 311                 /*
 312                  * check for SCSI ints in the same go and
 313                  * eventually save an interrupt
 314                  */
 315         }
 316
 317         if (dev->sc_flags & SBICF_INTR && stat & ISTR_INTS)
 318                 found += sbicintr(dev);
 319         return(found);
 320 }
 321
 322
 323 int
 324 atzsc_dmanext(struct sbic_softc *dev)
 325 {
 326         volatile struct sdmac *sdp;
 327
 328         sdp = dev->sc_cregs;
 329
 330         if (dev->sc_cur > dev->sc_last) {
 331                 /* shouldn't happen !! */
 332                 printf("atzsc_dmanext at end !!!\n");
 333                 atzsc_dmastop(dev);
 334                 return(0);
 335         }
 336         if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) {
 337                   /*
 338                    * only FLUSH if terminal count not enabled,
 339                    * and reading from peripheral
 340                    */
 341                 sdp->FLUSH = 1;
 342                 while ((sdp->ISTR & ISTR_FE_FLG) == 0)
 343                         ;
 344         }
 345         /*
 346          * clear possible interrupt and stop DMA
 347          */
 348         sdp->CINT = 1;  /* clear possible interrupt */
 349         sdp->SP_DMA = 1;        /* stop DMA */
 350         sdp->CNTR = dev->sc_dmacmd;
 351         sdp->ACR = (u_int)dev->sc_cur->dc_addr;
 352         sdp->ST_DMA = 1;
 353
 354         dev->sc_tcnt = dev->sc_cur->dc_count << 1;
 355         return(dev->sc_tcnt);
 356 }
 357
 358 #ifdef DEBUG
 359 void
 360 atzsc_dump(void)
 361 {
 362         extern struct cfdriver atzsc_cd;
 363         struct sbic_softc *sc;
 364         int i;
 365
 366         for (i = 0; i < atzsc_cd.cd_ndevs; ++i) {
 367                 sc = device_lookup_private(&atzsc_cd, i);
 368                 if (sc != NULL)
 369                         sbic_dump(sc);
 370         }
 371 }
 372 #endif