i8257.c (17567B)
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 "qapi/error.h" 31 #include "qemu/main-loop.h" 32 #include "qemu/module.h" 33 #include "qemu/log.h" 34 #include "trace.h" 35 36 37 /* #define DEBUG_DMA */ 38 39 #define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__) 40 #ifdef DEBUG_DMA 41 #define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__) 42 #define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__) 43 #else 44 #define linfo(...) 45 #define ldebug(...) 46 #endif 47 48 #define ADDR 0 49 #define COUNT 1 50 51 enum { 52 CMD_MEMORY_TO_MEMORY = 0x01, 53 CMD_FIXED_ADDRESS = 0x02, 54 CMD_BLOCK_CONTROLLER = 0x04, 55 CMD_COMPRESSED_TIME = 0x08, 56 CMD_CYCLIC_PRIORITY = 0x10, 57 CMD_EXTENDED_WRITE = 0x20, 58 CMD_LOW_DREQ = 0x40, 59 CMD_LOW_DACK = 0x80, 60 CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS 61 | CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE 62 | CMD_LOW_DREQ | CMD_LOW_DACK 63 64 }; 65 66 static void i8257_dma_run(void *opaque); 67 68 static const int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0}; 69 70 static void i8257_write_page(void *opaque, uint32_t nport, uint32_t data) 71 { 72 I8257State *d = opaque; 73 int ichan; 74 75 ichan = channels[nport & 7]; 76 if (-1 == ichan) { 77 dolog ("invalid channel %#x %#x\n", nport, data); 78 return; 79 } 80 d->regs[ichan].page = data; 81 } 82 83 static void i8257_write_pageh(void *opaque, uint32_t nport, uint32_t data) 84 { 85 I8257State *d = opaque; 86 int ichan; 87 88 ichan = channels[nport & 7]; 89 if (-1 == ichan) { 90 dolog ("invalid channel %#x %#x\n", nport, data); 91 return; 92 } 93 d->regs[ichan].pageh = data; 94 } 95 96 static uint32_t i8257_read_page(void *opaque, uint32_t nport) 97 { 98 I8257State *d = opaque; 99 int ichan; 100 101 ichan = channels[nport & 7]; 102 if (-1 == ichan) { 103 dolog ("invalid channel read %#x\n", nport); 104 return 0; 105 } 106 return d->regs[ichan].page; 107 } 108 109 static uint32_t i8257_read_pageh(void *opaque, uint32_t nport) 110 { 111 I8257State *d = opaque; 112 int ichan; 113 114 ichan = channels[nport & 7]; 115 if (-1 == ichan) { 116 dolog ("invalid channel read %#x\n", nport); 117 return 0; 118 } 119 return d->regs[ichan].pageh; 120 } 121 122 static inline void i8257_init_chan(I8257State *d, int ichan) 123 { 124 I8257Regs *r; 125 126 r = d->regs + ichan; 127 r->now[ADDR] = r->base[ADDR] << d->dshift; 128 r->now[COUNT] = 0; 129 } 130 131 static inline int i8257_getff(I8257State *d) 132 { 133 int ff; 134 135 ff = d->flip_flop; 136 d->flip_flop = !ff; 137 return ff; 138 } 139 140 static uint64_t i8257_read_chan(void *opaque, hwaddr nport, unsigned size) 141 { 142 I8257State *d = opaque; 143 int ichan, nreg, iport, ff, val, dir; 144 I8257Regs *r; 145 146 iport = (nport >> d->dshift) & 0x0f; 147 ichan = iport >> 1; 148 nreg = iport & 1; 149 r = d->regs + ichan; 150 151 dir = ((r->mode >> 5) & 1) ? -1 : 1; 152 ff = i8257_getff(d); 153 if (nreg) 154 val = (r->base[COUNT] << d->dshift) - r->now[COUNT]; 155 else 156 val = r->now[ADDR] + r->now[COUNT] * dir; 157 158 ldebug ("read_chan %#x -> %d\n", iport, val); 159 return (val >> (d->dshift + (ff << 3))) & 0xff; 160 } 161 162 static void i8257_write_chan(void *opaque, hwaddr nport, uint64_t data, 163 unsigned int size) 164 { 165 I8257State *d = opaque; 166 int iport, ichan, nreg; 167 I8257Regs *r; 168 169 iport = (nport >> d->dshift) & 0x0f; 170 ichan = iport >> 1; 171 nreg = iport & 1; 172 r = d->regs + ichan; 173 if (i8257_getff(d)) { 174 r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00); 175 i8257_init_chan(d, ichan); 176 } else { 177 r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff); 178 } 179 } 180 181 static void i8257_write_cont(void *opaque, hwaddr nport, uint64_t data, 182 unsigned int size) 183 { 184 I8257State *d = opaque; 185 int iport, ichan = 0; 186 187 iport = (nport >> d->dshift) & 0x0f; 188 switch (iport) { 189 case 0x00: /* command */ 190 if ((data != 0) && (data & CMD_NOT_SUPPORTED)) { 191 qemu_log_mask(LOG_UNIMP, "%s: cmd 0x%02"PRIx64" not supported\n", 192 __func__, data); 193 return; 194 } 195 d->command = data; 196 break; 197 198 case 0x01: 199 ichan = data & 3; 200 if (data & 4) { 201 d->status |= 1 << (ichan + 4); 202 } 203 else { 204 d->status &= ~(1 << (ichan + 4)); 205 } 206 d->status &= ~(1 << ichan); 207 i8257_dma_run(d); 208 break; 209 210 case 0x02: /* single mask */ 211 if (data & 4) 212 d->mask |= 1 << (data & 3); 213 else 214 d->mask &= ~(1 << (data & 3)); 215 i8257_dma_run(d); 216 break; 217 218 case 0x03: /* mode */ 219 { 220 ichan = data & 3; 221 #ifdef DEBUG_DMA 222 { 223 int op, ai, dir, opmode; 224 op = (data >> 2) & 3; 225 ai = (data >> 4) & 1; 226 dir = (data >> 5) & 1; 227 opmode = (data >> 6) & 3; 228 229 linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n", 230 ichan, op, ai, dir, opmode); 231 } 232 #endif 233 d->regs[ichan].mode = data; 234 break; 235 } 236 237 case 0x04: /* clear flip flop */ 238 d->flip_flop = 0; 239 break; 240 241 case 0x05: /* reset */ 242 d->flip_flop = 0; 243 d->mask = ~0; 244 d->status = 0; 245 d->command = 0; 246 break; 247 248 case 0x06: /* clear mask for all channels */ 249 d->mask = 0; 250 i8257_dma_run(d); 251 break; 252 253 case 0x07: /* write mask for all channels */ 254 d->mask = data; 255 i8257_dma_run(d); 256 break; 257 258 default: 259 dolog ("unknown iport %#x\n", iport); 260 break; 261 } 262 263 #ifdef DEBUG_DMA 264 if (0xc != iport) { 265 linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n", 266 nport, ichan, data); 267 } 268 #endif 269 } 270 271 static uint64_t i8257_read_cont(void *opaque, hwaddr nport, unsigned size) 272 { 273 I8257State *d = opaque; 274 int iport, val; 275 276 iport = (nport >> d->dshift) & 0x0f; 277 switch (iport) { 278 case 0x00: /* status */ 279 val = d->status; 280 d->status &= 0xf0; 281 break; 282 case 0x01: /* mask */ 283 val = d->mask; 284 break; 285 default: 286 val = 0; 287 break; 288 } 289 290 ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val); 291 return val; 292 } 293 294 static bool i8257_dma_has_autoinitialization(IsaDma *obj, int nchan) 295 { 296 I8257State *d = I8257(obj); 297 return (d->regs[nchan & 3].mode >> 4) & 1; 298 } 299 300 static void i8257_dma_hold_DREQ(IsaDma *obj, int nchan) 301 { 302 I8257State *d = I8257(obj); 303 int ichan; 304 305 ichan = nchan & 3; 306 d->status |= 1 << (ichan + 4); 307 i8257_dma_run(d); 308 } 309 310 static void i8257_dma_release_DREQ(IsaDma *obj, int nchan) 311 { 312 I8257State *d = I8257(obj); 313 int ichan; 314 315 ichan = nchan & 3; 316 d->status &= ~(1 << (ichan + 4)); 317 i8257_dma_run(d); 318 } 319 320 static void i8257_channel_run(I8257State *d, int ichan) 321 { 322 int ncont = d->dshift; 323 int n; 324 I8257Regs *r = &d->regs[ichan]; 325 #ifdef DEBUG_DMA 326 int dir, opmode; 327 328 dir = (r->mode >> 5) & 1; 329 opmode = (r->mode >> 6) & 3; 330 331 if (dir) { 332 dolog ("DMA in address decrement mode\n"); 333 } 334 if (opmode != 1) { 335 dolog ("DMA not in single mode select %#x\n", opmode); 336 } 337 #endif 338 339 n = r->transfer_handler (r->opaque, ichan + (ncont << 2), 340 r->now[COUNT], (r->base[COUNT] + 1) << ncont); 341 r->now[COUNT] = n; 342 ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont); 343 if (n == (r->base[COUNT] + 1) << ncont) { 344 ldebug("transfer done\n"); 345 d->status |= (1 << ichan); 346 } 347 } 348 349 static void i8257_dma_run(void *opaque) 350 { 351 I8257State *d = opaque; 352 int ichan; 353 int rearm = 0; 354 355 if (d->running) { 356 rearm = 1; 357 goto out; 358 } else { 359 d->running = 1; 360 } 361 362 for (ichan = 0; ichan < 4; ichan++) { 363 int mask; 364 365 mask = 1 << ichan; 366 367 if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) { 368 i8257_channel_run(d, ichan); 369 rearm = 1; 370 } 371 } 372 373 d->running = 0; 374 out: 375 if (rearm) { 376 qemu_bh_schedule_idle(d->dma_bh); 377 d->dma_bh_scheduled = true; 378 } 379 } 380 381 static void i8257_dma_register_channel(IsaDma *obj, int nchan, 382 IsaDmaTransferHandler transfer_handler, 383 void *opaque) 384 { 385 I8257State *d = I8257(obj); 386 I8257Regs *r; 387 int ichan; 388 389 ichan = nchan & 3; 390 391 r = d->regs + ichan; 392 r->transfer_handler = transfer_handler; 393 r->opaque = opaque; 394 } 395 396 static bool i8257_is_verify_transfer(I8257Regs *r) 397 { 398 return (r->mode & 0x0c) == 0; 399 } 400 401 static int i8257_dma_read_memory(IsaDma *obj, int nchan, void *buf, int pos, 402 int len) 403 { 404 I8257State *d = I8257(obj); 405 I8257Regs *r = &d->regs[nchan & 3]; 406 hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; 407 408 if (i8257_is_verify_transfer(r)) { 409 return len; 410 } 411 412 if (r->mode & 0x20) { 413 int i; 414 uint8_t *p = buf; 415 416 cpu_physical_memory_read (addr - pos - len, buf, len); 417 /* What about 16bit transfers? */ 418 for (i = 0; i < len >> 1; i++) { 419 uint8_t b = p[len - i - 1]; 420 p[i] = b; 421 } 422 } 423 else 424 cpu_physical_memory_read (addr + pos, buf, len); 425 426 return len; 427 } 428 429 static int i8257_dma_write_memory(IsaDma *obj, int nchan, void *buf, int pos, 430 int len) 431 { 432 I8257State *s = I8257(obj); 433 I8257Regs *r = &s->regs[nchan & 3]; 434 hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; 435 436 if (i8257_is_verify_transfer(r)) { 437 return len; 438 } 439 440 if (r->mode & 0x20) { 441 int i; 442 uint8_t *p = buf; 443 444 cpu_physical_memory_write (addr - pos - len, buf, len); 445 /* What about 16bit transfers? */ 446 for (i = 0; i < len; i++) { 447 uint8_t b = p[len - i - 1]; 448 p[i] = b; 449 } 450 } 451 else 452 cpu_physical_memory_write (addr + pos, buf, len); 453 454 return len; 455 } 456 457 /* request the emulator to transfer a new DMA memory block ASAP (even 458 * if the idle bottom half would not have exited the iothread yet). 459 */ 460 static void i8257_dma_schedule(IsaDma *obj) 461 { 462 I8257State *d = I8257(obj); 463 if (d->dma_bh_scheduled) { 464 qemu_notify_event(); 465 } 466 } 467 468 static void i8257_reset(DeviceState *dev) 469 { 470 I8257State *d = I8257(dev); 471 i8257_write_cont(d, (0x05 << d->dshift), 0, 1); 472 } 473 474 static int i8257_phony_handler(void *opaque, int nchan, int dma_pos, 475 int dma_len) 476 { 477 trace_i8257_unregistered_dma(nchan, dma_pos, dma_len); 478 return dma_pos; 479 } 480 481 482 static const MemoryRegionOps channel_io_ops = { 483 .read = i8257_read_chan, 484 .write = i8257_write_chan, 485 .endianness = DEVICE_NATIVE_ENDIAN, 486 .impl = { 487 .min_access_size = 1, 488 .max_access_size = 1, 489 }, 490 }; 491 492 /* IOport from page_base */ 493 static const MemoryRegionPortio page_portio_list[] = { 494 { 0x01, 3, 1, .write = i8257_write_page, .read = i8257_read_page, }, 495 { 0x07, 1, 1, .write = i8257_write_page, .read = i8257_read_page, }, 496 PORTIO_END_OF_LIST(), 497 }; 498 499 /* IOport from pageh_base */ 500 static const MemoryRegionPortio pageh_portio_list[] = { 501 { 0x01, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, }, 502 { 0x07, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, }, 503 PORTIO_END_OF_LIST(), 504 }; 505 506 static const MemoryRegionOps cont_io_ops = { 507 .read = i8257_read_cont, 508 .write = i8257_write_cont, 509 .endianness = DEVICE_NATIVE_ENDIAN, 510 .impl = { 511 .min_access_size = 1, 512 .max_access_size = 1, 513 }, 514 }; 515 516 static const VMStateDescription vmstate_i8257_regs = { 517 .name = "dma_regs", 518 .version_id = 1, 519 .minimum_version_id = 1, 520 .fields = (VMStateField[]) { 521 VMSTATE_INT32_ARRAY(now, I8257Regs, 2), 522 VMSTATE_UINT16_ARRAY(base, I8257Regs, 2), 523 VMSTATE_UINT8(mode, I8257Regs), 524 VMSTATE_UINT8(page, I8257Regs), 525 VMSTATE_UINT8(pageh, I8257Regs), 526 VMSTATE_UINT8(dack, I8257Regs), 527 VMSTATE_UINT8(eop, I8257Regs), 528 VMSTATE_END_OF_LIST() 529 } 530 }; 531 532 static int i8257_post_load(void *opaque, int version_id) 533 { 534 I8257State *d = opaque; 535 i8257_dma_run(d); 536 537 return 0; 538 } 539 540 static const VMStateDescription vmstate_i8257 = { 541 .name = "dma", 542 .version_id = 1, 543 .minimum_version_id = 1, 544 .post_load = i8257_post_load, 545 .fields = (VMStateField[]) { 546 VMSTATE_UINT8(command, I8257State), 547 VMSTATE_UINT8(mask, I8257State), 548 VMSTATE_UINT8(flip_flop, I8257State), 549 VMSTATE_INT32(dshift, I8257State), 550 VMSTATE_STRUCT_ARRAY(regs, I8257State, 4, 1, vmstate_i8257_regs, 551 I8257Regs), 552 VMSTATE_END_OF_LIST() 553 } 554 }; 555 556 static void i8257_realize(DeviceState *dev, Error **errp) 557 { 558 ISADevice *isa = ISA_DEVICE(dev); 559 I8257State *d = I8257(dev); 560 int i; 561 562 memory_region_init_io(&d->channel_io, OBJECT(dev), &channel_io_ops, d, 563 "dma-chan", 8 << d->dshift); 564 memory_region_add_subregion(isa_address_space_io(isa), 565 d->base, &d->channel_io); 566 567 isa_register_portio_list(isa, &d->portio_page, 568 d->page_base, page_portio_list, d, 569 "dma-page"); 570 if (d->pageh_base >= 0) { 571 isa_register_portio_list(isa, &d->portio_pageh, 572 d->pageh_base, pageh_portio_list, d, 573 "dma-pageh"); 574 } 575 576 memory_region_init_io(&d->cont_io, OBJECT(isa), &cont_io_ops, d, 577 "dma-cont", 8 << d->dshift); 578 memory_region_add_subregion(isa_address_space_io(isa), 579 d->base + (8 << d->dshift), &d->cont_io); 580 581 for (i = 0; i < ARRAY_SIZE(d->regs); ++i) { 582 d->regs[i].transfer_handler = i8257_phony_handler; 583 } 584 585 d->dma_bh = qemu_bh_new(i8257_dma_run, d); 586 } 587 588 static Property i8257_properties[] = { 589 DEFINE_PROP_INT32("base", I8257State, base, 0x00), 590 DEFINE_PROP_INT32("page-base", I8257State, page_base, 0x80), 591 DEFINE_PROP_INT32("pageh-base", I8257State, pageh_base, 0x480), 592 DEFINE_PROP_INT32("dshift", I8257State, dshift, 0), 593 DEFINE_PROP_END_OF_LIST() 594 }; 595 596 static void i8257_class_init(ObjectClass *klass, void *data) 597 { 598 DeviceClass *dc = DEVICE_CLASS(klass); 599 IsaDmaClass *idc = ISADMA_CLASS(klass); 600 601 dc->realize = i8257_realize; 602 dc->reset = i8257_reset; 603 dc->vmsd = &vmstate_i8257; 604 device_class_set_props(dc, i8257_properties); 605 606 idc->has_autoinitialization = i8257_dma_has_autoinitialization; 607 idc->read_memory = i8257_dma_read_memory; 608 idc->write_memory = i8257_dma_write_memory; 609 idc->hold_DREQ = i8257_dma_hold_DREQ; 610 idc->release_DREQ = i8257_dma_release_DREQ; 611 idc->schedule = i8257_dma_schedule; 612 idc->register_channel = i8257_dma_register_channel; 613 /* Reason: needs to be wired up by isa_bus_dma() to work */ 614 dc->user_creatable = false; 615 } 616 617 static const TypeInfo i8257_info = { 618 .name = TYPE_I8257, 619 .parent = TYPE_ISA_DEVICE, 620 .instance_size = sizeof(I8257State), 621 .class_init = i8257_class_init, 622 .interfaces = (InterfaceInfo[]) { 623 { TYPE_ISADMA }, 624 { } 625 } 626 }; 627 628 static void i8257_register_types(void) 629 { 630 type_register_static(&i8257_info); 631 } 632 633 type_init(i8257_register_types) 634 635 void i8257_dma_init(ISABus *bus, bool high_page_enable) 636 { 637 ISADevice *isa1, *isa2; 638 DeviceState *d; 639 640 isa1 = isa_new(TYPE_I8257); 641 d = DEVICE(isa1); 642 qdev_prop_set_int32(d, "base", 0x00); 643 qdev_prop_set_int32(d, "page-base", 0x80); 644 qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1); 645 qdev_prop_set_int32(d, "dshift", 0); 646 isa_realize_and_unref(isa1, bus, &error_fatal); 647 648 isa2 = isa_new(TYPE_I8257); 649 d = DEVICE(isa2); 650 qdev_prop_set_int32(d, "base", 0xc0); 651 qdev_prop_set_int32(d, "page-base", 0x88); 652 qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1); 653 qdev_prop_set_int32(d, "dshift", 1); 654 isa_realize_and_unref(isa2, bus, &error_fatal); 655 656 isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2)); 657 }