isadma.c revision 1.4.10.1
1 /* $NetBSD: isadma.c,v 1.4.10.1 2002/10/18 02:35:12 nathanw Exp $ */ 2 /* $OpenBSD: isadma.c,v 1.2 1996/11/23 21:45:34 kstailey Exp $ */ 3 /* NetBSD: isadma.c,v 1.19 1996/04/29 20:03:26 christos Exp */ 4 5 #include <sys/param.h> 6 #include <sys/systm.h> 7 #include <sys/device.h> 8 #include <sys/file.h> 9 #include <sys/buf.h> 10 #include <sys/syslog.h> 11 #include <sys/malloc.h> 12 #include <sys/uio.h> 13 14 #include <uvm/uvm_extern.h> 15 16 #include <machine/pio.h> 17 18 #include <dev/isa/isareg.h> 19 #include <dev/isa/isavar.h> 20 #include <dev/isa/isadmavar.h> 21 #include <arch/arc/isa/isadmareg.h> /*XXX*/ 22 23 struct dma_info { 24 int flags; 25 int active; 26 caddr_t addr; 27 bus_size_t nbytes; 28 struct isadma_seg phys[1]; 29 }; 30 31 static struct isadma_softc *isadma_sc; /*XXX ugly */ 32 static struct dma_info dma_info[8]; 33 static u_int8_t dma_finished; 34 35 /* high byte of address is stored in this port for i-th dma channel */ 36 static int dmapageport[2][4] = { 37 {0x87, 0x83, 0x81, 0x82}, 38 {0x8f, 0x8b, 0x89, 0x8a} 39 }; 40 41 static u_int8_t dmamode[4] = { 42 DMA37MD_READ | DMA37MD_SINGLE, 43 DMA37MD_WRITE | DMA37MD_SINGLE, 44 DMA37MD_READ | DMA37MD_LOOP, 45 DMA37MD_WRITE | DMA37MD_LOOP 46 }; 47 48 int isadmamatch __P((struct device *, struct cfdata *, void *)); 49 void isadmaattach __P((struct device *, struct device *, void *)); 50 int isadmaprint __P((void *, const char *)); 51 52 struct isadma_softc { 53 struct device sc_dev; 54 bus_space_tag_t sc_iot; 55 bus_space_handle_t sc_ioh1; 56 bus_space_handle_t sc_ioh2; 57 } 58 59 CFATTACH_DECL(isadma, sizeof(struct isadma_softc), 60 isadmamatch, isadmaattach, NULL, NULL); 61 62 struct cfdriver isadma_cd = { 63 NULL, "isadma", DV_DULL, 1 64 }; 65 66 isadmamatch(parent, match, aux) 67 struct device *parent; 68 struct cfdata *match; 69 void *aux; 70 { 71 struct isa_attach_args *ia = aux; 72 73 /* Sure we exist */ 74 ia->ia_iosize = 0; 75 return (1); 76 } 77 78 void 79 isadmaattach(parent, self, aux) 80 struct device *parent, *self; 81 void *aux; 82 { 83 struct isadma_softc *sc = (void *)self; 84 struct isa_attach_args *ia = aux; 85 bus_space_tag_t iot; 86 bus_space_handle_t ioh; 87 88 printf("\n"); 89 90 iot = sc->sc_iot = ia->ia_iot; 91 if (bus_space_map(iot, IO_DMA1, DMA_NREGS, 0, &ioh)) 92 panic("isadmaattach: couldn't map I/O ports"); 93 sc->sc_ioh1 = ioh; 94 if (bus_space_map(iot, IO_DMA2, DMA_NREGS*2, 0, &ioh)) 95 panic("isadmaattach: couldn't map I/O ports"); 96 sc->sc_ioh2 = ioh; 97 isadma_sc = sc; 98 } 99 100 /* 101 * isadma_cascade(): program 8237 DMA controller channel to accept 102 * external dma control by a board. 103 */ 104 void 105 isadma_cascade(chan) 106 int chan; 107 { 108 struct isadma_softc *sc = isadma_sc; 109 bus_space_tag_t iot = sc->sc_iot; 110 111 #ifdef ISADMA_DEBUG 112 if (chan < 0 || chan > 7) 113 panic("isadma_cascade: impossible request"); 114 #endif 115 116 /* set dma channel mode, and set dma channel mode */ 117 if ((chan & 4) == 0) { 118 bus_space_write_1(iot, sc->sc_ioh1, DMA1_MODE, chan | DMA37MD_CASCADE); 119 bus_space_write_1(iot, sc->sc_ioh1, DMA1_SMSK, chan); 120 } else { 121 chan &= 3; 122 123 bus_space_write_1(iot, sc->sc_ioh2, DMA2_MODE, chan | DMA37MD_CASCADE); 124 bus_space_write_1(iot, sc->sc_ioh2, DMA2_SMSK, chan); 125 } 126 } 127 128 /* 129 * isadma_start(): program 8237 DMA controller channel, avoid page alignment 130 * problems by using a bounce buffer. 131 */ 132 void 133 isadma_start(addr, nbytes, chan, flags) 134 caddr_t addr; 135 bus_size_t nbytes; 136 int chan; 137 int flags; 138 { 139 struct dma_info *di; 140 int waport; 141 int mflags; 142 struct isadma_softc *sc = isadma_sc; 143 bus_space_tag_t iot = sc->sc_iot; 144 bus_space_handle_t ioh; 145 146 #ifdef ISADMA_DEBUG 147 if (chan < 0 || chan > 7 || 148 (((flags & DMAMODE_READ) != 0) + ((flags & DMAMODE_WRITE) != 0) + 149 ((flags & DMAMODE_LOOP) != 0) != 1) || 150 ((chan & 4) ? (nbytes >= (1<<17) || nbytes & 1 || (u_int)addr & 1) : 151 (nbytes >= (1<<16)))) 152 panic("isadma_start: impossible request"); 153 #endif 154 155 di = dma_info+chan; 156 if (di->active) { 157 log(LOG_ERR,"isadma_start: old request active on %d\n",chan); 158 isadma_abort(chan); 159 } 160 161 di->flags = flags; 162 di->active = 1; 163 di->addr = addr; 164 di->nbytes = nbytes; 165 166 mflags = ISADMA_MAP_WAITOK | ISADMA_MAP_BOUNCE | ISADMA_MAP_CONTIG; 167 mflags |= (chan & 4) ? ISADMA_MAP_16BIT : ISADMA_MAP_8BIT; 168 169 if (isadma_map(addr, nbytes, di->phys, mflags) != 1) 170 panic("isadma_start: cannot map"); 171 172 /* XXX Will this do what we want with DMAMODE_LOOP? */ 173 if ((flags & DMAMODE_READ) == 0) 174 isadma_copytobuf(addr, nbytes, 1, di->phys); 175 176 dma_finished &= ~(1 << chan); 177 178 if ((chan & 4) == 0) { 179 ioh = sc->sc_ioh1; 180 /* 181 * Program one of DMA channels 0..3. These are 182 * byte mode channels. 183 */ 184 /* set dma channel mode, and reset address ff */ 185 bus_space_write_1(iot, ioh, DMA1_MODE, chan | dmamode[flags]); 186 bus_space_write_1(iot, ioh, DMA1_FFC, 0); 187 188 /* send start address */ 189 waport = DMA1_CHN(chan); 190 outb(dmapageport[0][chan], di->phys[0].addr>>16); 191 outb(waport, di->phys[0].addr); 192 outb(waport, di->phys[0].addr>>8); 193 194 /* send count */ 195 outb(waport + 1, --nbytes); 196 outb(waport + 1, nbytes>>8); 197 198 /* unmask channel */ 199 bus_space_write_1(iot, ioh, DMA1_SMSK, chan | DMA37SM_CLEAR); 200 } else { 201 ioh = sc->sc_ioh2; 202 /* 203 * Program one of DMA channels 4..7. These are 204 * word mode channels. 205 */ 206 /* set dma channel mode, and reset address ff */ 207 bus_space_write_1(iot, ioh, DMA2_MODE, (chan & 3) | dmamode[flags]); 208 bus_space_write_1(iot, ioh, DMA2_FFC, 0); 209 210 /* send start address */ 211 waport = DMA2_CHN(chan & 3); 212 outb(dmapageport[1][chan], di->phys[0].addr>>16); 213 outb(waport, di->phys[0].addr>>1); 214 outb(waport, di->phys[0].addr>>9); 215 216 /* send count */ 217 nbytes >>= 1; 218 outb(waport + 2, --nbytes); 219 outb(waport + 2, nbytes>>8); 220 221 /* unmask channel */ 222 bus_space_write_1(iot, ioh, DMA2_SMSK, (chan & 3) | DMA37SM_CLEAR); 223 } 224 } 225 226 void 227 isadma_abort(chan) 228 int chan; 229 { 230 struct dma_info *di; 231 struct isadma_softc *sc = isadma_sc; 232 bus_space_tag_t iot = sc->sc_iot; 233 234 #ifdef ISADMA_DEBUG 235 if (chan < 0 || chan > 7) 236 panic("isadma_abort: impossible request"); 237 #endif 238 239 di = dma_info+chan; 240 if (! di->active) { 241 log(LOG_ERR,"isadma_abort: no request active on %d\n",chan); 242 return; 243 } 244 245 /* mask channel */ 246 if ((chan & 4) == 0) 247 bus_space_write_1(iot, sc->sc_ioh1, DMA1_SMSK, DMA37SM_SET | chan); 248 else 249 bus_space_write_1(iot, sc->sc_ioh2, DMA2_SMSK, DMA37SM_SET | (chan & 3)); 250 251 isadma_unmap(di->addr, di->nbytes, 1, di->phys); 252 di->active = 0; 253 } 254 255 int 256 isadma_finished(chan) 257 int chan; 258 { 259 struct isadma_softc *sc = isadma_sc; 260 bus_space_tag_t iot = sc->sc_iot; 261 262 #ifdef ISADMA_DEBUG 263 if (chan < 0 || chan > 7) 264 panic("isadma_finished: impossible request"); 265 #endif 266 267 /* check that the terminal count was reached */ 268 if ((chan & 4) == 0) 269 dma_finished |= bus_space_read_1(iot, sc->sc_ioh1, DMA1_SR) & 0x0f; 270 else 271 dma_finished |= (bus_space_read_1(iot, sc->sc_ioh2, DMA2_SR) & 0x0f) << 4; 272 273 return ((dma_finished & (1 << chan)) != 0); 274 } 275 276 void 277 isadma_done(chan) 278 int chan; 279 { 280 struct dma_info *di; 281 u_char tc; 282 struct isadma_softc *sc = isadma_sc; 283 bus_space_tag_t iot = sc->sc_iot; 284 285 #ifdef DIAGNOSTIC 286 if (chan < 0 || chan > 7) 287 panic("isadma_done: impossible request"); 288 #endif 289 290 di = dma_info+chan; 291 if (! di->active) { 292 log(LOG_ERR,"isadma_done: no request active on %d\n",chan); 293 return; 294 } 295 296 /* check that the terminal count was reached */ 297 if ((chan & 4) == 0) 298 tc = bus_space_read_1(iot, sc->sc_ioh1, DMA1_SR) & (1 << chan); 299 else 300 tc = bus_space_read_1(iot, sc->sc_ioh2, DMA2_SR) & (1 << (chan & 3)); 301 if (tc == 0) 302 /* XXX probably should panic or something */ 303 log(LOG_ERR, "dma channel %d not finished\n", chan); 304 305 /* mask channel */ 306 if ((chan & 4) == 0) 307 bus_space_write_1(iot, sc->sc_ioh1, DMA1_SMSK, DMA37SM_SET | chan); 308 else 309 bus_space_write_1(iot, sc->sc_ioh2, DMA2_SMSK, DMA37SM_SET | (chan & 3)); 310 311 /* XXX Will this do what we want with DMAMODE_LOOP? */ 312 if (di->flags & DMAMODE_READ) 313 isadma_copyfrombuf(di->addr, di->nbytes, 1, di->phys); 314 315 isadma_unmap(di->addr, di->nbytes, 1, di->phys); 316 di->active = 0; 317 } 318
Indexes created Mon Oct 20 11:09:49 GMT 2025