1 /* 2 * QEMU DMA emulation 3 * 4 * Copyright (c) 2003-2004 Vassili Karpov (malc) 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/isa/isa.h" 27 #include "hw/qdev-properties.h" 28 #include "migration/vmstate.h" 29 #include "hw/dma/i8257.h" 30 #include "qemu/main-loop.h" 31 #include "qemu/module.h" 32 #include "qemu/log.h" 33 #include "trace.h" 34 35 #define I8257(obj) \ 36 OBJECT_CHECK(I8257State, (obj), TYPE_I8257) 37 38 /* #define DEBUG_DMA */ 39 40 #define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__) 41 #ifdef DEBUG_DMA 42 #define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__) 43 #define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__) 44 #else 45 #define linfo(...) 46 #define ldebug(...) 47 #endif 48 49 #define ADDR 0 50 #define COUNT 1 51 52 enum { 53 CMD_MEMORY_TO_MEMORY = 0x01, 54 CMD_FIXED_ADDRESS = 0x02, 55 CMD_BLOCK_CONTROLLER = 0x04, 56 CMD_COMPRESSED_TIME = 0x08, 57 CMD_CYCLIC_PRIORITY = 0x10, 58 CMD_EXTENDED_WRITE = 0x20, 59 CMD_LOW_DREQ = 0x40, 60 CMD_LOW_DACK = 0x80, 61 CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS 62 | CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE 63 | CMD_LOW_DREQ | CMD_LOW_DACK 64 65 }; 66 67 static void i8257_dma_run(void *opaque); 68 69 static const int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0}; 70 71 static void i8257_write_page(void *opaque, uint32_t nport, uint32_t data) 72 { 73 I8257State *d = opaque; 74 int ichan; 75 76 ichan = channels[nport & 7]; 77 if (-1 == ichan) { 78 dolog ("invalid channel %#x %#x\n", nport, data); 79 return; 80 } 81 d->regs[ichan].page = data; 82 } 83 84 static void i8257_write_pageh(void *opaque, uint32_t nport, uint32_t data) 85 { 86 I8257State *d = opaque; 87 int ichan; 88 89 ichan = channels[nport & 7]; 90 if (-1 == ichan) { 91 dolog ("invalid channel %#x %#x\n", nport, data); 92 return; 93 } 94 d->regs[ichan].pageh = data; 95 } 96 97 static uint32_t i8257_read_page(void *opaque, uint32_t nport) 98 { 99 I8257State *d = opaque; 100 int ichan; 101 102 ichan = channels[nport & 7]; 103 if (-1 == ichan) { 104 dolog ("invalid channel read %#x\n", nport); 105 return 0; 106 } 107 return d->regs[ichan].page; 108 } 109 110 static uint32_t i8257_read_pageh(void *opaque, uint32_t nport) 111 { 112 I8257State *d = opaque; 113 int ichan; 114 115 ichan = channels[nport & 7]; 116 if (-1 == ichan) { 117 dolog ("invalid channel read %#x\n", nport); 118 return 0; 119 } 120 return d->regs[ichan].pageh; 121 } 122 123 static inline void i8257_init_chan(I8257State *d, int ichan) 124 { 125 I8257Regs *r; 126 127 r = d->regs + ichan; 128 r->now[ADDR] = r->base[ADDR] << d->dshift; 129 r->now[COUNT] = 0; 130 } 131 132 static inline int i8257_getff(I8257State *d) 133 { 134 int ff; 135 136 ff = d->flip_flop; 137 d->flip_flop = !ff; 138 return ff; 139 } 140 141 static uint64_t i8257_read_chan(void *opaque, hwaddr nport, unsigned size) 142 { 143 I8257State *d = opaque; 144 int ichan, nreg, iport, ff, val, dir; 145 I8257Regs *r; 146 147 iport = (nport >> d->dshift) & 0x0f; 148 ichan = iport >> 1; 149 nreg = iport & 1; 150 r = d->regs + ichan; 151 152 dir = ((r->mode >> 5) & 1) ? -1 : 1; 153 ff = i8257_getff(d); 154 if (nreg) 155 val = (r->base[COUNT] << d->dshift) - r->now[COUNT]; 156 else 157 val = r->now[ADDR] + r->now[COUNT] * dir; 158 159 ldebug ("read_chan %#x -> %d\n", iport, val); 160 return (val >> (d->dshift + (ff << 3))) & 0xff; 161 } 162 163 static void i8257_write_chan(void *opaque, hwaddr nport, uint64_t data, 164 unsigned int size) 165 { 166 I8257State *d = opaque; 167 int iport, ichan, nreg; 168 I8257Regs *r; 169 170 iport = (nport >> d->dshift) & 0x0f; 171 ichan = iport >> 1; 172 nreg = iport & 1; 173 r = d->regs + ichan; 174 if (i8257_getff(d)) { 175 r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00); 176 i8257_init_chan(d, ichan); 177 } else { 178 r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff); 179 } 180 } 181 182 static void i8257_write_cont(void *opaque, hwaddr nport, uint64_t data, 183 unsigned int size) 184 { 185 I8257State *d = opaque; 186 int iport, ichan = 0; 187 188 iport = (nport >> d->dshift) & 0x0f; 189 switch (iport) { 190 case 0x00: /* command */ 191 if ((data != 0) && (data & CMD_NOT_SUPPORTED)) { 192 qemu_log_mask(LOG_UNIMP, "%s: cmd 0x%02"PRIx64" not supported\n", 193 __func__, data); 194 return; 195 } 196 d->command = data; 197 break; 198 199 case 0x01: 200 ichan = data & 3; 201 if (data & 4) { 202 d->status |= 1 << (ichan + 4); 203 } 204 else { 205 d->status &= ~(1 << (ichan + 4)); 206 } 207 d->status &= ~(1 << ichan); 208 i8257_dma_run(d); 209 break; 210 211 case 0x02: /* single mask */ 212 if (data & 4) 213 d->mask |= 1 << (data & 3); 214 else 215 d->mask &= ~(1 << (data & 3)); 216 i8257_dma_run(d); 217 break; 218 219 case 0x03: /* mode */ 220 { 221 ichan = data & 3; 222 #ifdef DEBUG_DMA 223 { 224 int op, ai, dir, opmode; 225 op = (data >> 2) & 3; 226 ai = (data >> 4) & 1; 227 dir = (data >> 5) & 1; 228 opmode = (data >> 6) & 3; 229 230 linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n", 231 ichan, op, ai, dir, opmode); 232 } 233 #endif 234 d->regs[ichan].mode = data; 235 break; 236 } 237 238 case 0x04: /* clear flip flop */ 239 d->flip_flop = 0; 240 break; 241 242 case 0x05: /* reset */ 243 d->flip_flop = 0; 244 d->mask = ~0; 245 d->status = 0; 246 d->command = 0; 247 break; 248 249 case 0x06: /* clear mask for all channels */ 250 d->mask = 0; 251 i8257_dma_run(d); 252 break; 253 254 case 0x07: /* write mask for all channels */ 255 d->mask = data; 256 i8257_dma_run(d); 257 break; 258 259 default: 260 dolog ("unknown iport %#x\n", iport); 261 break; 262 } 263 264 #ifdef DEBUG_DMA 265 if (0xc != iport) { 266 linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n", 267 nport, ichan, data); 268 } 269 #endif 270 } 271 272 static uint64_t i8257_read_cont(void *opaque, hwaddr nport, unsigned size) 273 { 274 I8257State *d = opaque; 275 int iport, val; 276 277 iport = (nport >> d->dshift) & 0x0f; 278 switch (iport) { 279 case 0x00: /* status */ 280 val = d->status; 281 d->status &= 0xf0; 282 break; 283 case 0x01: /* mask */ 284 val = d->mask; 285 break; 286 default: 287 val = 0; 288 break; 289 } 290 291 ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val); 292 return val; 293 } 294 295 static IsaDmaTransferMode i8257_dma_get_transfer_mode(IsaDma *obj, int nchan) 296 { 297 I8257State *d = I8257(obj); 298 return (d->regs[nchan & 3].mode >> 2) & 3; 299 } 300 301 static bool i8257_dma_has_autoinitialization(IsaDma *obj, int nchan) 302 { 303 I8257State *d = I8257(obj); 304 return (d->regs[nchan & 3].mode >> 4) & 1; 305 } 306 307 static void i8257_dma_hold_DREQ(IsaDma *obj, int nchan) 308 { 309 I8257State *d = I8257(obj); 310 int ichan; 311 312 ichan = nchan & 3; 313 d->status |= 1 << (ichan + 4); 314 i8257_dma_run(d); 315 } 316 317 static void i8257_dma_release_DREQ(IsaDma *obj, int nchan) 318 { 319 I8257State *d = I8257(obj); 320 int ichan; 321 322 ichan = nchan & 3; 323 d->status &= ~(1 << (ichan + 4)); 324 i8257_dma_run(d); 325 } 326 327 static void i8257_channel_run(I8257State *d, int ichan) 328 { 329 int ncont = d->dshift; 330 int n; 331 I8257Regs *r = &d->regs[ichan]; 332 #ifdef DEBUG_DMA 333 int dir, opmode; 334 335 dir = (r->mode >> 5) & 1; 336 opmode = (r->mode >> 6) & 3; 337 338 if (dir) { 339 dolog ("DMA in address decrement mode\n"); 340 } 341 if (opmode != 1) { 342 dolog ("DMA not in single mode select %#x\n", opmode); 343 } 344 #endif 345 346 n = r->transfer_handler (r->opaque, ichan + (ncont << 2), 347 r->now[COUNT], (r->base[COUNT] + 1) << ncont); 348 r->now[COUNT] = n; 349 ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont); 350 if (n == (r->base[COUNT] + 1) << ncont) { 351 ldebug("transfer done\n"); 352 d->status |= (1 << ichan); 353 } 354 } 355 356 static void i8257_dma_run(void *opaque) 357 { 358 I8257State *d = opaque; 359 int ichan; 360 int rearm = 0; 361 362 if (d->running) { 363 rearm = 1; 364 goto out; 365 } else { 366 d->running = 1; 367 } 368 369 for (ichan = 0; ichan < 4; ichan++) { 370 int mask; 371 372 mask = 1 << ichan; 373 374 if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) { 375 i8257_channel_run(d, ichan); 376 rearm = 1; 377 } 378 } 379 380 d->running = 0; 381 out: 382 if (rearm) { 383 qemu_bh_schedule_idle(d->dma_bh); 384 d->dma_bh_scheduled = true; 385 } 386 } 387 388 static void i8257_dma_register_channel(IsaDma *obj, int nchan, 389 IsaDmaTransferHandler transfer_handler, 390 void *opaque) 391 { 392 I8257State *d = I8257(obj); 393 I8257Regs *r; 394 int ichan; 395 396 ichan = nchan & 3; 397 398 r = d->regs + ichan; 399 r->transfer_handler = transfer_handler; 400 r->opaque = opaque; 401 } 402 403 static int i8257_dma_read_memory(IsaDma *obj, int nchan, void *buf, int pos, 404 int len) 405 { 406 I8257State *d = I8257(obj); 407 I8257Regs *r = &d->regs[nchan & 3]; 408 hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; 409 410 if (r->mode & 0x20) { 411 int i; 412 uint8_t *p = buf; 413 414 cpu_physical_memory_read (addr - pos - len, buf, len); 415 /* What about 16bit transfers? */ 416 for (i = 0; i < len >> 1; i++) { 417 uint8_t b = p[len - i - 1]; 418 p[i] = b; 419 } 420 } 421 else 422 cpu_physical_memory_read (addr + pos, buf, len); 423 424 return len; 425 } 426 427 static int i8257_dma_write_memory(IsaDma *obj, int nchan, void *buf, int pos, 428 int len) 429 { 430 I8257State *s = I8257(obj); 431 I8257Regs *r = &s->regs[nchan & 3]; 432 hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; 433 434 if (r->mode & 0x20) { 435 int i; 436 uint8_t *p = buf; 437 438 cpu_physical_memory_write (addr - pos - len, buf, len); 439 /* What about 16bit transfers? */ 440 for (i = 0; i < len; i++) { 441 uint8_t b = p[len - i - 1]; 442 p[i] = b; 443 } 444 } 445 else 446 cpu_physical_memory_write (addr + pos, buf, len); 447 448 return len; 449 } 450 451 /* request the emulator to transfer a new DMA memory block ASAP (even 452 * if the idle bottom half would not have exited the iothread yet). 453 */ 454 static void i8257_dma_schedule(IsaDma *obj) 455 { 456 I8257State *d = I8257(obj); 457 if (d->dma_bh_scheduled) { 458 qemu_notify_event(); 459 } 460 } 461 462 static void i8257_reset(DeviceState *dev) 463 { 464 I8257State *d = I8257(dev); 465 i8257_write_cont(d, (0x05 << d->dshift), 0, 1); 466 } 467 468 static int i8257_phony_handler(void *opaque, int nchan, int dma_pos, 469 int dma_len) 470 { 471 trace_i8257_unregistered_dma(nchan, dma_pos, dma_len); 472 return dma_pos; 473 } 474 475 476 static const MemoryRegionOps channel_io_ops = { 477 .read = i8257_read_chan, 478 .write = i8257_write_chan, 479 .endianness = DEVICE_NATIVE_ENDIAN, 480 .impl = { 481 .min_access_size = 1, 482 .max_access_size = 1, 483 }, 484 }; 485 486 /* IOport from page_base */ 487 static const MemoryRegionPortio page_portio_list[] = { 488 { 0x01, 3, 1, .write = i8257_write_page, .read = i8257_read_page, }, 489 { 0x07, 1, 1, .write = i8257_write_page, .read = i8257_read_page, }, 490 PORTIO_END_OF_LIST(), 491 }; 492 493 /* IOport from pageh_base */ 494 static const MemoryRegionPortio pageh_portio_list[] = { 495 { 0x01, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, }, 496 { 0x07, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, }, 497 PORTIO_END_OF_LIST(), 498 }; 499 500 static const MemoryRegionOps cont_io_ops = { 501 .read = i8257_read_cont, 502 .write = i8257_write_cont, 503 .endianness = DEVICE_NATIVE_ENDIAN, 504 .impl = { 505 .min_access_size = 1, 506 .max_access_size = 1, 507 }, 508 }; 509 510 static const VMStateDescription vmstate_i8257_regs = { 511 .name = "dma_regs", 512 .version_id = 1, 513 .minimum_version_id = 1, 514 .fields = (VMStateField[]) { 515 VMSTATE_INT32_ARRAY(now, I8257Regs, 2), 516 VMSTATE_UINT16_ARRAY(base, I8257Regs, 2), 517 VMSTATE_UINT8(mode, I8257Regs), 518 VMSTATE_UINT8(page, I8257Regs), 519 VMSTATE_UINT8(pageh, I8257Regs), 520 VMSTATE_UINT8(dack, I8257Regs), 521 VMSTATE_UINT8(eop, I8257Regs), 522 VMSTATE_END_OF_LIST() 523 } 524 }; 525 526 static int i8257_post_load(void *opaque, int version_id) 527 { 528 I8257State *d = opaque; 529 i8257_dma_run(d); 530 531 return 0; 532 } 533 534 static const VMStateDescription vmstate_i8257 = { 535 .name = "dma", 536 .version_id = 1, 537 .minimum_version_id = 1, 538 .post_load = i8257_post_load, 539 .fields = (VMStateField[]) { 540 VMSTATE_UINT8(command, I8257State), 541 VMSTATE_UINT8(mask, I8257State), 542 VMSTATE_UINT8(flip_flop, I8257State), 543 VMSTATE_INT32(dshift, I8257State), 544 VMSTATE_STRUCT_ARRAY(regs, I8257State, 4, 1, vmstate_i8257_regs, 545 I8257Regs), 546 VMSTATE_END_OF_LIST() 547 } 548 }; 549 550 static void i8257_realize(DeviceState *dev, Error **errp) 551 { 552 ISADevice *isa = ISA_DEVICE(dev); 553 I8257State *d = I8257(dev); 554 int i; 555 556 memory_region_init_io(&d->channel_io, NULL, &channel_io_ops, d, 557 "dma-chan", 8 << d->dshift); 558 memory_region_add_subregion(isa_address_space_io(isa), 559 d->base, &d->channel_io); 560 561 isa_register_portio_list(isa, &d->portio_page, 562 d->page_base, page_portio_list, d, 563 "dma-page"); 564 if (d->pageh_base >= 0) { 565 isa_register_portio_list(isa, &d->portio_pageh, 566 d->pageh_base, pageh_portio_list, d, 567 "dma-pageh"); 568 } 569 570 memory_region_init_io(&d->cont_io, OBJECT(isa), &cont_io_ops, d, 571 "dma-cont", 8 << d->dshift); 572 memory_region_add_subregion(isa_address_space_io(isa), 573 d->base + (8 << d->dshift), &d->cont_io); 574 575 for (i = 0; i < ARRAY_SIZE(d->regs); ++i) { 576 d->regs[i].transfer_handler = i8257_phony_handler; 577 } 578 579 d->dma_bh = qemu_bh_new(i8257_dma_run, d); 580 } 581 582 static Property i8257_properties[] = { 583 DEFINE_PROP_INT32("base", I8257State, base, 0x00), 584 DEFINE_PROP_INT32("page-base", I8257State, page_base, 0x80), 585 DEFINE_PROP_INT32("pageh-base", I8257State, pageh_base, 0x480), 586 DEFINE_PROP_INT32("dshift", I8257State, dshift, 0), 587 DEFINE_PROP_END_OF_LIST() 588 }; 589 590 static void i8257_class_init(ObjectClass *klass, void *data) 591 { 592 DeviceClass *dc = DEVICE_CLASS(klass); 593 IsaDmaClass *idc = ISADMA_CLASS(klass); 594 595 dc->realize = i8257_realize; 596 dc->reset = i8257_reset; 597 dc->vmsd = &vmstate_i8257; 598 dc->props = i8257_properties; 599 600 idc->get_transfer_mode = i8257_dma_get_transfer_mode; 601 idc->has_autoinitialization = i8257_dma_has_autoinitialization; 602 idc->read_memory = i8257_dma_read_memory; 603 idc->write_memory = i8257_dma_write_memory; 604 idc->hold_DREQ = i8257_dma_hold_DREQ; 605 idc->release_DREQ = i8257_dma_release_DREQ; 606 idc->schedule = i8257_dma_schedule; 607 idc->register_channel = i8257_dma_register_channel; 608 /* Reason: needs to be wired up by isa_bus_dma() to work */ 609 dc->user_creatable = false; 610 } 611 612 static const TypeInfo i8257_info = { 613 .name = TYPE_I8257, 614 .parent = TYPE_ISA_DEVICE, 615 .instance_size = sizeof(I8257State), 616 .class_init = i8257_class_init, 617 .interfaces = (InterfaceInfo[]) { 618 { TYPE_ISADMA }, 619 { } 620 } 621 }; 622 623 static void i8257_register_types(void) 624 { 625 type_register_static(&i8257_info); 626 } 627 628 type_init(i8257_register_types) 629 630 void i8257_dma_init(ISABus *bus, bool high_page_enable) 631 { 632 ISADevice *isa1, *isa2; 633 DeviceState *d; 634 635 isa1 = isa_create(bus, TYPE_I8257); 636 d = DEVICE(isa1); 637 qdev_prop_set_int32(d, "base", 0x00); 638 qdev_prop_set_int32(d, "page-base", 0x80); 639 qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1); 640 qdev_prop_set_int32(d, "dshift", 0); 641 qdev_init_nofail(d); 642 643 isa2 = isa_create(bus, TYPE_I8257); 644 d = DEVICE(isa2); 645 qdev_prop_set_int32(d, "base", 0xc0); 646 qdev_prop_set_int32(d, "page-base", 0x88); 647 qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1); 648 qdev_prop_set_int32(d, "dshift", 1); 649 qdev_init_nofail(d); 650 651 isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2)); 652 } 653