1 /* 2 * Arm PrimeCell PL080/PL081 DMA controller 3 * 4 * Copyright (c) 2006 CodeSourcery. 5 * Written by Paul Brook 6 * 7 * This code is licensed under the GPL. 8 */ 9 10 #include "hw/sysbus.h" 11 #include "exec/address-spaces.h" 12 13 #define PL080_MAX_CHANNELS 8 14 #define PL080_CONF_E 0x1 15 #define PL080_CONF_M1 0x2 16 #define PL080_CONF_M2 0x4 17 18 #define PL080_CCONF_H 0x40000 19 #define PL080_CCONF_A 0x20000 20 #define PL080_CCONF_L 0x10000 21 #define PL080_CCONF_ITC 0x08000 22 #define PL080_CCONF_IE 0x04000 23 #define PL080_CCONF_E 0x00001 24 25 #define PL080_CCTRL_I 0x80000000 26 #define PL080_CCTRL_DI 0x08000000 27 #define PL080_CCTRL_SI 0x04000000 28 #define PL080_CCTRL_D 0x02000000 29 #define PL080_CCTRL_S 0x01000000 30 31 typedef struct { 32 uint32_t src; 33 uint32_t dest; 34 uint32_t lli; 35 uint32_t ctrl; 36 uint32_t conf; 37 } pl080_channel; 38 39 #define TYPE_PL080 "pl080" 40 #define PL080(obj) OBJECT_CHECK(PL080State, (obj), TYPE_PL080) 41 42 typedef struct PL080State { 43 SysBusDevice parent_obj; 44 45 MemoryRegion iomem; 46 uint8_t tc_int; 47 uint8_t tc_mask; 48 uint8_t err_int; 49 uint8_t err_mask; 50 uint32_t conf; 51 uint32_t sync; 52 uint32_t req_single; 53 uint32_t req_burst; 54 pl080_channel chan[PL080_MAX_CHANNELS]; 55 int nchannels; 56 /* Flag to avoid recursive DMA invocations. */ 57 int running; 58 qemu_irq irq; 59 } PL080State; 60 61 static const VMStateDescription vmstate_pl080_channel = { 62 .name = "pl080_channel", 63 .version_id = 1, 64 .minimum_version_id = 1, 65 .fields = (VMStateField[]) { 66 VMSTATE_UINT32(src, pl080_channel), 67 VMSTATE_UINT32(dest, pl080_channel), 68 VMSTATE_UINT32(lli, pl080_channel), 69 VMSTATE_UINT32(ctrl, pl080_channel), 70 VMSTATE_UINT32(conf, pl080_channel), 71 VMSTATE_END_OF_LIST() 72 } 73 }; 74 75 static const VMStateDescription vmstate_pl080 = { 76 .name = "pl080", 77 .version_id = 1, 78 .minimum_version_id = 1, 79 .fields = (VMStateField[]) { 80 VMSTATE_UINT8(tc_int, PL080State), 81 VMSTATE_UINT8(tc_mask, PL080State), 82 VMSTATE_UINT8(err_int, PL080State), 83 VMSTATE_UINT8(err_mask, PL080State), 84 VMSTATE_UINT32(conf, PL080State), 85 VMSTATE_UINT32(sync, PL080State), 86 VMSTATE_UINT32(req_single, PL080State), 87 VMSTATE_UINT32(req_burst, PL080State), 88 VMSTATE_UINT8(tc_int, PL080State), 89 VMSTATE_UINT8(tc_int, PL080State), 90 VMSTATE_UINT8(tc_int, PL080State), 91 VMSTATE_STRUCT_ARRAY(chan, PL080State, PL080_MAX_CHANNELS, 92 1, vmstate_pl080_channel, pl080_channel), 93 VMSTATE_INT32(running, PL080State), 94 VMSTATE_END_OF_LIST() 95 } 96 }; 97 98 static const unsigned char pl080_id[] = 99 { 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 }; 100 101 static const unsigned char pl081_id[] = 102 { 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 }; 103 104 static void pl080_update(PL080State *s) 105 { 106 if ((s->tc_int & s->tc_mask) 107 || (s->err_int & s->err_mask)) 108 qemu_irq_raise(s->irq); 109 else 110 qemu_irq_lower(s->irq); 111 } 112 113 static void pl080_run(PL080State *s) 114 { 115 int c; 116 int flow; 117 pl080_channel *ch; 118 int swidth; 119 int dwidth; 120 int xsize; 121 int n; 122 int src_id; 123 int dest_id; 124 int size; 125 uint8_t buff[4]; 126 uint32_t req; 127 128 s->tc_mask = 0; 129 for (c = 0; c < s->nchannels; c++) { 130 if (s->chan[c].conf & PL080_CCONF_ITC) 131 s->tc_mask |= 1 << c; 132 if (s->chan[c].conf & PL080_CCONF_IE) 133 s->err_mask |= 1 << c; 134 } 135 136 if ((s->conf & PL080_CONF_E) == 0) 137 return; 138 139 hw_error("DMA active\n"); 140 /* If we are already in the middle of a DMA operation then indicate that 141 there may be new DMA requests and return immediately. */ 142 if (s->running) { 143 s->running++; 144 return; 145 } 146 s->running = 1; 147 while (s->running) { 148 for (c = 0; c < s->nchannels; c++) { 149 ch = &s->chan[c]; 150 again: 151 /* Test if thiws channel has any pending DMA requests. */ 152 if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E)) 153 != PL080_CCONF_E) 154 continue; 155 flow = (ch->conf >> 11) & 7; 156 if (flow >= 4) { 157 hw_error( 158 "pl080_run: Peripheral flow control not implemented\n"); 159 } 160 src_id = (ch->conf >> 1) & 0x1f; 161 dest_id = (ch->conf >> 6) & 0x1f; 162 size = ch->ctrl & 0xfff; 163 req = s->req_single | s->req_burst; 164 switch (flow) { 165 case 0: 166 break; 167 case 1: 168 if ((req & (1u << dest_id)) == 0) 169 size = 0; 170 break; 171 case 2: 172 if ((req & (1u << src_id)) == 0) 173 size = 0; 174 break; 175 case 3: 176 if ((req & (1u << src_id)) == 0 177 || (req & (1u << dest_id)) == 0) 178 size = 0; 179 break; 180 } 181 if (!size) 182 continue; 183 184 /* Transfer one element. */ 185 /* ??? Should transfer multiple elements for a burst request. */ 186 /* ??? Unclear what the proper behavior is when source and 187 destination widths are different. */ 188 swidth = 1 << ((ch->ctrl >> 18) & 7); 189 dwidth = 1 << ((ch->ctrl >> 21) & 7); 190 for (n = 0; n < dwidth; n+= swidth) { 191 cpu_physical_memory_read(ch->src, buff + n, swidth); 192 if (ch->ctrl & PL080_CCTRL_SI) 193 ch->src += swidth; 194 } 195 xsize = (dwidth < swidth) ? swidth : dwidth; 196 /* ??? This may pad the value incorrectly for dwidth < 32. */ 197 for (n = 0; n < xsize; n += dwidth) { 198 cpu_physical_memory_write(ch->dest + n, buff + n, dwidth); 199 if (ch->ctrl & PL080_CCTRL_DI) 200 ch->dest += swidth; 201 } 202 203 size--; 204 ch->ctrl = (ch->ctrl & 0xfffff000) | size; 205 if (size == 0) { 206 /* Transfer complete. */ 207 if (ch->lli) { 208 ch->src = ldl_le_phys(&address_space_memory, ch->lli); 209 ch->dest = ldl_le_phys(&address_space_memory, ch->lli + 4); 210 ch->ctrl = ldl_le_phys(&address_space_memory, ch->lli + 12); 211 ch->lli = ldl_le_phys(&address_space_memory, ch->lli + 8); 212 } else { 213 ch->conf &= ~PL080_CCONF_E; 214 } 215 if (ch->ctrl & PL080_CCTRL_I) { 216 s->tc_int |= 1 << c; 217 } 218 } 219 goto again; 220 } 221 if (--s->running) 222 s->running = 1; 223 } 224 } 225 226 static uint64_t pl080_read(void *opaque, hwaddr offset, 227 unsigned size) 228 { 229 PL080State *s = (PL080State *)opaque; 230 uint32_t i; 231 uint32_t mask; 232 233 if (offset >= 0xfe0 && offset < 0x1000) { 234 if (s->nchannels == 8) { 235 return pl080_id[(offset - 0xfe0) >> 2]; 236 } else { 237 return pl081_id[(offset - 0xfe0) >> 2]; 238 } 239 } 240 if (offset >= 0x100 && offset < 0x200) { 241 i = (offset & 0xe0) >> 5; 242 if (i >= s->nchannels) 243 goto bad_offset; 244 switch (offset >> 2) { 245 case 0: /* SrcAddr */ 246 return s->chan[i].src; 247 case 1: /* DestAddr */ 248 return s->chan[i].dest; 249 case 2: /* LLI */ 250 return s->chan[i].lli; 251 case 3: /* Control */ 252 return s->chan[i].ctrl; 253 case 4: /* Configuration */ 254 return s->chan[i].conf; 255 default: 256 goto bad_offset; 257 } 258 } 259 switch (offset >> 2) { 260 case 0: /* IntStatus */ 261 return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask); 262 case 1: /* IntTCStatus */ 263 return (s->tc_int & s->tc_mask); 264 case 3: /* IntErrorStatus */ 265 return (s->err_int & s->err_mask); 266 case 5: /* RawIntTCStatus */ 267 return s->tc_int; 268 case 6: /* RawIntErrorStatus */ 269 return s->err_int; 270 case 7: /* EnbldChns */ 271 mask = 0; 272 for (i = 0; i < s->nchannels; i++) { 273 if (s->chan[i].conf & PL080_CCONF_E) 274 mask |= 1 << i; 275 } 276 return mask; 277 case 8: /* SoftBReq */ 278 case 9: /* SoftSReq */ 279 case 10: /* SoftLBReq */ 280 case 11: /* SoftLSReq */ 281 /* ??? Implement these. */ 282 return 0; 283 case 12: /* Configuration */ 284 return s->conf; 285 case 13: /* Sync */ 286 return s->sync; 287 default: 288 bad_offset: 289 qemu_log_mask(LOG_GUEST_ERROR, 290 "pl080_read: Bad offset %x\n", (int)offset); 291 return 0; 292 } 293 } 294 295 static void pl080_write(void *opaque, hwaddr offset, 296 uint64_t value, unsigned size) 297 { 298 PL080State *s = (PL080State *)opaque; 299 int i; 300 301 if (offset >= 0x100 && offset < 0x200) { 302 i = (offset & 0xe0) >> 5; 303 if (i >= s->nchannels) 304 goto bad_offset; 305 switch (offset >> 2) { 306 case 0: /* SrcAddr */ 307 s->chan[i].src = value; 308 break; 309 case 1: /* DestAddr */ 310 s->chan[i].dest = value; 311 break; 312 case 2: /* LLI */ 313 s->chan[i].lli = value; 314 break; 315 case 3: /* Control */ 316 s->chan[i].ctrl = value; 317 break; 318 case 4: /* Configuration */ 319 s->chan[i].conf = value; 320 pl080_run(s); 321 break; 322 } 323 } 324 switch (offset >> 2) { 325 case 2: /* IntTCClear */ 326 s->tc_int &= ~value; 327 break; 328 case 4: /* IntErrorClear */ 329 s->err_int &= ~value; 330 break; 331 case 8: /* SoftBReq */ 332 case 9: /* SoftSReq */ 333 case 10: /* SoftLBReq */ 334 case 11: /* SoftLSReq */ 335 /* ??? Implement these. */ 336 qemu_log_mask(LOG_UNIMP, "pl080_write: Soft DMA not implemented\n"); 337 break; 338 case 12: /* Configuration */ 339 s->conf = value; 340 if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) { 341 qemu_log_mask(LOG_UNIMP, 342 "pl080_write: Big-endian DMA not implemented\n"); 343 } 344 pl080_run(s); 345 break; 346 case 13: /* Sync */ 347 s->sync = value; 348 break; 349 default: 350 bad_offset: 351 qemu_log_mask(LOG_GUEST_ERROR, 352 "pl080_write: Bad offset %x\n", (int)offset); 353 } 354 pl080_update(s); 355 } 356 357 static const MemoryRegionOps pl080_ops = { 358 .read = pl080_read, 359 .write = pl080_write, 360 .endianness = DEVICE_NATIVE_ENDIAN, 361 }; 362 363 static void pl080_init(Object *obj) 364 { 365 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 366 PL080State *s = PL080(obj); 367 368 memory_region_init_io(&s->iomem, OBJECT(s), &pl080_ops, s, "pl080", 0x1000); 369 sysbus_init_mmio(sbd, &s->iomem); 370 sysbus_init_irq(sbd, &s->irq); 371 s->nchannels = 8; 372 } 373 374 static void pl081_init(Object *obj) 375 { 376 PL080State *s = PL080(obj); 377 378 s->nchannels = 2; 379 } 380 381 static void pl080_class_init(ObjectClass *oc, void *data) 382 { 383 DeviceClass *dc = DEVICE_CLASS(oc); 384 385 dc->vmsd = &vmstate_pl080; 386 } 387 388 static const TypeInfo pl080_info = { 389 .name = TYPE_PL080, 390 .parent = TYPE_SYS_BUS_DEVICE, 391 .instance_size = sizeof(PL080State), 392 .instance_init = pl080_init, 393 .class_init = pl080_class_init, 394 }; 395 396 static const TypeInfo pl081_info = { 397 .name = "pl081", 398 .parent = TYPE_PL080, 399 .instance_init = pl081_init, 400 }; 401 402 /* The PL080 and PL081 are the same except for the number of channels 403 they implement (8 and 2 respectively). */ 404 static void pl080_register_types(void) 405 { 406 type_register_static(&pl080_info); 407 type_register_static(&pl081_info); 408 } 409 410 type_init(pl080_register_types) 411