1 /* $NetBSD: atzsc.c,v 1.22 1996/12/23 09:09:52 veego Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christian E. Hopps 5 * Copyright (c) 1982, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)dma.c 37 */ 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/device.h> 42 #include <scsi/scsi_all.h> 43 #include <scsi/scsiconf.h> 44 #include <amiga/amiga/custom.h> 45 #include <amiga/amiga/cc.h> 46 #include <amiga/amiga/device.h> 47 #include <amiga/amiga/isr.h> 48 #include <amiga/dev/dmavar.h> 49 #include <amiga/dev/sbicreg.h> 50 #include <amiga/dev/sbicvar.h> 51 #include <amiga/dev/atzscreg.h> 52 #include <amiga/dev/zbusvar.h> 53 54 void atzscattach __P((struct device *, struct device *, void *)); 55 int atzscmatch __P((struct device *, struct cfdata *, void *)); 56 57 void atzsc_enintr __P((struct sbic_softc *)); 58 void atzsc_dmastop __P((struct sbic_softc *)); 59 int atzsc_dmanext __P((struct sbic_softc *)); 60 int atzsc_dmaintr __P((void *)); 61 int atzsc_dmago __P((struct sbic_softc *, char *, int, int)); 62 63 #ifdef DEBUG 64 void atzsc_dump __P((void)); 65 #endif 66 67 struct scsi_adapter atzsc_scsiswitch = { 68 sbic_scsicmd, 69 sbic_minphys, 70 0, /* no lun support */ 71 0, /* no lun support */ 72 }; 73 74 struct scsi_device atzsc_scsidev = { 75 NULL, /* use default error handler */ 76 NULL, /* do not have a start functio */ 77 NULL, /* have no async handler */ 78 NULL, /* Use default done routine */ 79 }; 80 81 82 #ifdef DEBUG 83 int atzsc_dmadebug = 0; 84 #endif 85 86 struct cfattach atzsc_ca = { 87 sizeof(struct sbic_softc), atzscmatch, atzscattach 88 }; 89 90 struct cfdriver atzsc_cd = { 91 NULL, "atzsc", DV_DULL, NULL, 0 92 }; 93 94 /* 95 * if we are an A3000 we are here. 96 */ 97 int 98 atzscmatch(pdp, cfp, auxp) 99 struct device *pdp; 100 struct cfdata *cfp; 101 void *auxp; 102 { 103 struct zbus_args *zap; 104 105 zap = auxp; 106 107 /* 108 * Check manufacturer and product id. 109 * I was informed that older boards can be 2 also. 110 */ 111 if (zap->manid == 514 && (zap->prodid == 3 || zap->prodid == 2)) 112 return(1); 113 else 114 return(0); 115 } 116 117 void 118 atzscattach(pdp, dp, auxp) 119 struct device *pdp, *dp; 120 void *auxp; 121 { 122 volatile struct sdmac *rp; 123 struct sbic_softc *sc; 124 struct zbus_args *zap; 125 126 zap = auxp; 127 128 sc = (struct sbic_softc *)dp; 129 sc->sc_cregs = rp = zap->va; 130 /* 131 * disable ints and reset bank register 132 */ 133 rp->CNTR = CNTR_PDMD; 134 rp->DAWR = DAWR_ATZSC; 135 sc->sc_enintr = atzsc_enintr; 136 sc->sc_dmago = atzsc_dmago; 137 sc->sc_dmanext = atzsc_dmanext; 138 sc->sc_dmastop = atzsc_dmastop; 139 sc->sc_dmacmd = 0; 140 141 /* 142 * only 24 bit mem. 143 */ 144 sc->sc_flags |= SBICF_BADDMA; 145 sc->sc_dmamask = ~0x00ffffff; 146 #if 0 147 /* 148 * If the users kva space is not ztwo try and allocate a bounce buffer. 149 * XXX this needs to change if we move to multiple memory segments. 150 */ 151 if (kvtop(sc) & sc->sc_dmamask) { 152 sc->sc_dmabuffer = (char *)alloc_z2mem(MAXPHYS * 8); /* XXX */ 153 if (isztwomem(sc->sc_dmabuffer)) 154 printf(" bounce pa 0x%x", kvtop(sc->sc_dmabuffer)); 155 else if (sc->sc_dmabuffer) 156 printf(" bounce pa 0x%x", 157 PREP_DMA_MEM(sc->sc_dmabuffer)); 158 } 159 #endif 160 sc->sc_sbicp = (sbic_regmap_p) ((int)rp + 0x91); 161 sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 77; 162 163 printf(": dmamask 0x%lx\n", ~sc->sc_dmamask); 164 165 sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE; 166 sc->sc_link.adapter_softc = sc; 167 sc->sc_link.adapter_target = 7; 168 sc->sc_link.adapter = &atzsc_scsiswitch; 169 sc->sc_link.device = &atzsc_scsidev; 170 sc->sc_link.openings = 2; 171 sc->sc_link.max_target = 7; 172 173 sbicinit(sc); 174 175 sc->sc_isr.isr_intr = atzsc_dmaintr; 176 sc->sc_isr.isr_arg = sc; 177 sc->sc_isr.isr_ipl = 2; 178 add_isr (&sc->sc_isr); 179 180 /* 181 * attach all scsi units on us 182 */ 183 config_found(dp, &sc->sc_link, scsiprint); 184 } 185 186 void 187 atzsc_enintr(dev) 188 struct sbic_softc *dev; 189 { 190 volatile struct sdmac *sdp; 191 192 sdp = dev->sc_cregs; 193 194 dev->sc_flags |= SBICF_INTR; 195 sdp->CNTR = CNTR_PDMD | CNTR_INTEN; 196 } 197 198 int 199 atzsc_dmago(dev, addr, count, flags) 200 struct sbic_softc *dev; 201 char *addr; 202 int count, flags; 203 { 204 volatile struct sdmac *sdp; 205 206 sdp = dev->sc_cregs; 207 /* 208 * Set up the command word based on flags 209 */ 210 dev->sc_dmacmd = CNTR_PDMD | CNTR_INTEN; 211 if ((flags & DMAGO_READ) == 0) 212 dev->sc_dmacmd |= CNTR_DDIR; 213 #ifdef DEBUG 214 if (atzsc_dmadebug & DDB_IO) 215 printf("atzsc_dmago: cmd %x\n", dev->sc_dmacmd); 216 #endif 217 218 dev->sc_flags |= SBICF_INTR; 219 sdp->CNTR = dev->sc_dmacmd; 220 sdp->ACR = (u_int) dev->sc_cur->dc_addr; 221 sdp->ST_DMA = 1; 222 223 return(dev->sc_tcnt); 224 } 225 226 void 227 atzsc_dmastop(dev) 228 struct sbic_softc *dev; 229 { 230 volatile struct sdmac *sdp; 231 int s; 232 233 sdp = dev->sc_cregs; 234 235 #ifdef DEBUG 236 if (atzsc_dmadebug & DDB_FOLLOW) 237 printf("atzsc_dmastop()\n"); 238 #endif 239 if (dev->sc_dmacmd) { 240 s = splbio(); 241 if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) { 242 /* 243 * only FLUSH if terminal count not enabled, 244 * and reading from peripheral 245 */ 246 sdp->FLUSH = 1; 247 while ((sdp->ISTR & ISTR_FE_FLG) == 0) 248 ; 249 } 250 /* 251 * clear possible interrupt and stop dma 252 */ 253 sdp->CINT = 1; 254 sdp->SP_DMA = 1; 255 dev->sc_dmacmd = 0; 256 splx(s); 257 } 258 } 259 260 int 261 atzsc_dmaintr(arg) 262 void *arg; 263 { 264 struct sbic_softc *dev = arg; 265 volatile struct sdmac *sdp; 266 int stat, found; 267 268 sdp = dev->sc_cregs; 269 stat = sdp->ISTR; 270 271 if ((stat & (ISTR_INT_F|ISTR_INT_P)) == 0) 272 return (0); 273 274 #ifdef DEBUG 275 if (atzsc_dmadebug & DDB_FOLLOW) 276 printf("%s: dmaintr 0x%x\n", dev->sc_dev.dv_xname, stat); 277 #endif 278 279 /* 280 * both, SCSI and DMA interrupts arrive here. I chose 281 * arbitrarily that DMA interrupts should have higher 282 * precedence than SCSI interrupts. 283 */ 284 found = 0; 285 if (stat & ISTR_E_INT) { 286 found++; 287 288 sdp->CINT = 1; /* clear possible interrupt */ 289 290 /* 291 * check for SCSI ints in the same go and 292 * eventually save an interrupt 293 */ 294 } 295 296 if (dev->sc_flags & SBICF_INTR && stat & ISTR_INTS) 297 found += sbicintr(dev); 298 return(found); 299 } 300 301 302 int 303 atzsc_dmanext(dev) 304 struct sbic_softc *dev; 305 { 306 volatile struct sdmac *sdp; 307 308 sdp = dev->sc_cregs; 309 310 if (dev->sc_cur > dev->sc_last) { 311 /* shouldn't happen !! */ 312 printf("atzsc_dmanext at end !!!\n"); 313 atzsc_dmastop(dev); 314 return(0); 315 } 316 if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) { 317 /* 318 * only FLUSH if terminal count not enabled, 319 * and reading from peripheral 320 */ 321 sdp->FLUSH = 1; 322 while ((sdp->ISTR & ISTR_FE_FLG) == 0) 323 ; 324 } 325 /* 326 * clear possible interrupt and stop dma 327 */ 328 sdp->CINT = 1; /* clear possible interrupt */ 329 sdp->SP_DMA = 1; /* stop dma */ 330 sdp->CNTR = dev->sc_dmacmd; 331 sdp->ACR = (u_int)dev->sc_cur->dc_addr; 332 sdp->ST_DMA = 1; 333 334 dev->sc_tcnt = dev->sc_cur->dc_count << 1; 335 return(dev->sc_tcnt); 336 } 337 338 #ifdef DEBUG 339 void 340 atzsc_dump() 341 { 342 int i; 343 344 for (i = 0; i < atzsc_cd.cd_ndevs; ++i) 345 if (atzsc_cd.cd_devs[i]) 346 sbic_dump(atzsc_cd.cd_devs[i]); 347 } 348 #endif 349