1 /* 2 * QEMU MOS6522 VIA emulation 3 * 4 * Copyright (c) 2004-2007 Fabrice Bellard 5 * Copyright (c) 2007 Jocelyn Mayer 6 * Copyright (c) 2018 Mark Cave-Ayland 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 27 #include "qemu/osdep.h" 28 #include "hw/irq.h" 29 #include "hw/misc/mos6522.h" 30 #include "hw/qdev-properties.h" 31 #include "migration/vmstate.h" 32 #include "monitor/monitor.h" 33 #include "monitor/hmp.h" 34 #include "qapi/type-helpers.h" 35 #include "qemu/timer.h" 36 #include "qemu/cutils.h" 37 #include "qemu/log.h" 38 #include "qemu/module.h" 39 #include "trace.h" 40 41 42 static const char *mos6522_reg_names[MOS6522_NUM_REGS] = { 43 "ORB", "ORA", "DDRB", "DDRA", "T1CL", "T1CH", "T1LL", "T1LH", 44 "T2CL", "T2CH", "SR", "ACR", "PCR", "IFR", "IER", "ANH" 45 }; 46 47 /* XXX: implement all timer modes */ 48 49 static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, 50 int64_t current_time); 51 static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, 52 int64_t current_time); 53 54 static void mos6522_update_irq(MOS6522State *s) 55 { 56 if (s->ifr & s->ier) { 57 qemu_irq_raise(s->irq); 58 } else { 59 qemu_irq_lower(s->irq); 60 } 61 } 62 63 static void mos6522_set_irq(void *opaque, int n, int level) 64 { 65 MOS6522State *s = MOS6522(opaque); 66 int last_level = !!(s->last_irq_levels & (1 << n)); 67 uint8_t last_ifr = s->ifr; 68 bool positive_edge = true; 69 int ctrl; 70 71 /* 72 * SR_INT is managed by mos6522 instances and cleared upon SR 73 * read. It is only the external CA1/2 and CB1/2 lines that 74 * are edge-triggered and latched in IFR 75 */ 76 if (n != SR_INT_BIT && level == last_level) { 77 return; 78 } 79 80 /* Detect negative edge trigger */ 81 if (last_level == 1 && level == 0) { 82 positive_edge = false; 83 } 84 85 switch (n) { 86 case CA2_INT_BIT: 87 ctrl = (s->pcr & CA2_CTRL_MASK) >> CA2_CTRL_SHIFT; 88 if ((positive_edge && (ctrl & C2_POS)) || 89 (!positive_edge && !(ctrl & C2_POS))) { 90 s->ifr |= 1 << n; 91 } 92 break; 93 case CA1_INT_BIT: 94 ctrl = (s->pcr & CA1_CTRL_MASK) >> CA1_CTRL_SHIFT; 95 if ((positive_edge && (ctrl & C1_POS)) || 96 (!positive_edge && !(ctrl & C1_POS))) { 97 s->ifr |= 1 << n; 98 } 99 break; 100 case SR_INT_BIT: 101 s->ifr |= 1 << n; 102 break; 103 case CB2_INT_BIT: 104 ctrl = (s->pcr & CB2_CTRL_MASK) >> CB2_CTRL_SHIFT; 105 if ((positive_edge && (ctrl & C2_POS)) || 106 (!positive_edge && !(ctrl & C2_POS))) { 107 s->ifr |= 1 << n; 108 } 109 break; 110 case CB1_INT_BIT: 111 ctrl = (s->pcr & CB1_CTRL_MASK) >> CB1_CTRL_SHIFT; 112 if ((positive_edge && (ctrl & C1_POS)) || 113 (!positive_edge && !(ctrl & C1_POS))) { 114 s->ifr |= 1 << n; 115 } 116 break; 117 } 118 119 if (s->ifr != last_ifr) { 120 mos6522_update_irq(s); 121 } 122 123 if (level) { 124 s->last_irq_levels |= 1 << n; 125 } else { 126 s->last_irq_levels &= ~(1 << n); 127 } 128 } 129 130 static uint64_t get_counter_value(MOS6522State *s, MOS6522Timer *ti) 131 { 132 MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s); 133 134 if (ti->index == 0) { 135 return mdc->get_timer1_counter_value(s, ti); 136 } else { 137 return mdc->get_timer2_counter_value(s, ti); 138 } 139 } 140 141 static uint64_t get_load_time(MOS6522State *s, MOS6522Timer *ti) 142 { 143 MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s); 144 145 if (ti->index == 0) { 146 return mdc->get_timer1_load_time(s, ti); 147 } else { 148 return mdc->get_timer2_load_time(s, ti); 149 } 150 } 151 152 static unsigned int get_counter(MOS6522State *s, MOS6522Timer *ti) 153 { 154 int64_t d; 155 unsigned int counter; 156 157 d = get_counter_value(s, ti); 158 159 if (ti->index == 0) { 160 /* the timer goes down from latch to -1 (period of latch + 2) */ 161 if (d <= (ti->counter_value + 1)) { 162 counter = (ti->counter_value - d) & 0xffff; 163 } else { 164 counter = (d - (ti->counter_value + 1)) % (ti->latch + 2); 165 counter = (ti->latch - counter) & 0xffff; 166 } 167 } else { 168 counter = (ti->counter_value - d) & 0xffff; 169 } 170 return counter; 171 } 172 173 static void set_counter(MOS6522State *s, MOS6522Timer *ti, unsigned int val) 174 { 175 trace_mos6522_set_counter(1 + ti->index, val); 176 ti->load_time = get_load_time(s, ti); 177 ti->counter_value = val; 178 if (ti->index == 0) { 179 mos6522_timer1_update(s, ti, ti->load_time); 180 } else { 181 mos6522_timer2_update(s, ti, ti->load_time); 182 } 183 } 184 185 static int64_t get_next_irq_time(MOS6522State *s, MOS6522Timer *ti, 186 int64_t current_time) 187 { 188 int64_t d, next_time; 189 unsigned int counter; 190 191 if (ti->frequency == 0) { 192 return INT64_MAX; 193 } 194 195 /* current counter value */ 196 d = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - ti->load_time, 197 ti->frequency, NANOSECONDS_PER_SECOND); 198 199 /* the timer goes down from latch to -1 (period of latch + 2) */ 200 if (d <= (ti->counter_value + 1)) { 201 counter = (ti->counter_value - d) & 0xffff; 202 } else { 203 counter = (d - (ti->counter_value + 1)) % (ti->latch + 2); 204 counter = (ti->latch - counter) & 0xffff; 205 } 206 207 /* Note: we consider the irq is raised on 0 */ 208 if (counter == 0xffff) { 209 next_time = d + ti->latch + 1; 210 } else if (counter == 0) { 211 next_time = d + ti->latch + 2; 212 } else { 213 next_time = d + counter; 214 } 215 trace_mos6522_get_next_irq_time(ti->latch, d, next_time - d); 216 next_time = muldiv64(next_time, NANOSECONDS_PER_SECOND, ti->frequency) + 217 ti->load_time; 218 219 if (next_time <= current_time) { 220 next_time = current_time + 1; 221 } 222 return next_time; 223 } 224 225 static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, 226 int64_t current_time) 227 { 228 if (!ti->timer) { 229 return; 230 } 231 ti->next_irq_time = get_next_irq_time(s, ti, current_time); 232 if ((s->ier & T1_INT) == 0 || (s->acr & T1MODE) != T1MODE_CONT) { 233 timer_del(ti->timer); 234 } else { 235 timer_mod(ti->timer, ti->next_irq_time); 236 } 237 } 238 239 static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, 240 int64_t current_time) 241 { 242 if (!ti->timer) { 243 return; 244 } 245 ti->next_irq_time = get_next_irq_time(s, ti, current_time); 246 if ((s->ier & T2_INT) == 0) { 247 timer_del(ti->timer); 248 } else { 249 timer_mod(ti->timer, ti->next_irq_time); 250 } 251 } 252 253 static void mos6522_timer1(void *opaque) 254 { 255 MOS6522State *s = opaque; 256 MOS6522Timer *ti = &s->timers[0]; 257 258 mos6522_timer1_update(s, ti, ti->next_irq_time); 259 s->ifr |= T1_INT; 260 mos6522_update_irq(s); 261 } 262 263 static void mos6522_timer2(void *opaque) 264 { 265 MOS6522State *s = opaque; 266 MOS6522Timer *ti = &s->timers[1]; 267 268 mos6522_timer2_update(s, ti, ti->next_irq_time); 269 s->ifr |= T2_INT; 270 mos6522_update_irq(s); 271 } 272 273 static uint64_t mos6522_get_counter_value(MOS6522State *s, MOS6522Timer *ti) 274 { 275 return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - ti->load_time, 276 ti->frequency, NANOSECONDS_PER_SECOND); 277 } 278 279 static uint64_t mos6522_get_load_time(MOS6522State *s, MOS6522Timer *ti) 280 { 281 uint64_t load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 282 283 return load_time; 284 } 285 286 static void mos6522_portA_write(MOS6522State *s) 287 { 288 qemu_log_mask(LOG_UNIMP, "portA_write unimplemented\n"); 289 } 290 291 static void mos6522_portB_write(MOS6522State *s) 292 { 293 qemu_log_mask(LOG_UNIMP, "portB_write unimplemented\n"); 294 } 295 296 uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size) 297 { 298 MOS6522State *s = opaque; 299 uint32_t val; 300 int ctrl; 301 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 302 303 if (now >= s->timers[0].next_irq_time) { 304 mos6522_timer1_update(s, &s->timers[0], now); 305 s->ifr |= T1_INT; 306 } 307 if (now >= s->timers[1].next_irq_time) { 308 mos6522_timer2_update(s, &s->timers[1], now); 309 s->ifr |= T2_INT; 310 } 311 switch (addr) { 312 case VIA_REG_B: 313 val = s->b; 314 ctrl = (s->pcr & CB2_CTRL_MASK) >> CB2_CTRL_SHIFT; 315 if (!(ctrl & C2_IND)) { 316 s->ifr &= ~CB2_INT; 317 } 318 s->ifr &= ~CB1_INT; 319 mos6522_update_irq(s); 320 break; 321 case VIA_REG_A: 322 qemu_log_mask(LOG_UNIMP, "Read access to register A with handshake"); 323 /* fall through */ 324 case VIA_REG_ANH: 325 val = s->a; 326 ctrl = (s->pcr & CA2_CTRL_MASK) >> CA2_CTRL_SHIFT; 327 if (!(ctrl & C2_IND)) { 328 s->ifr &= ~CA2_INT; 329 } 330 s->ifr &= ~CA1_INT; 331 mos6522_update_irq(s); 332 break; 333 case VIA_REG_DIRB: 334 val = s->dirb; 335 break; 336 case VIA_REG_DIRA: 337 val = s->dira; 338 break; 339 case VIA_REG_T1CL: 340 val = get_counter(s, &s->timers[0]) & 0xff; 341 s->ifr &= ~T1_INT; 342 mos6522_update_irq(s); 343 break; 344 case VIA_REG_T1CH: 345 val = get_counter(s, &s->timers[0]) >> 8; 346 mos6522_update_irq(s); 347 break; 348 case VIA_REG_T1LL: 349 val = s->timers[0].latch & 0xff; 350 break; 351 case VIA_REG_T1LH: 352 /* XXX: check this */ 353 val = (s->timers[0].latch >> 8) & 0xff; 354 break; 355 case VIA_REG_T2CL: 356 val = get_counter(s, &s->timers[1]) & 0xff; 357 s->ifr &= ~T2_INT; 358 mos6522_update_irq(s); 359 break; 360 case VIA_REG_T2CH: 361 val = get_counter(s, &s->timers[1]) >> 8; 362 break; 363 case VIA_REG_SR: 364 val = s->sr; 365 s->ifr &= ~SR_INT; 366 mos6522_update_irq(s); 367 break; 368 case VIA_REG_ACR: 369 val = s->acr; 370 break; 371 case VIA_REG_PCR: 372 val = s->pcr; 373 break; 374 case VIA_REG_IFR: 375 val = s->ifr; 376 if (s->ifr & s->ier) { 377 val |= 0x80; 378 } 379 break; 380 case VIA_REG_IER: 381 val = s->ier | 0x80; 382 break; 383 default: 384 g_assert_not_reached(); 385 } 386 387 if (addr != VIA_REG_IFR || val != 0) { 388 trace_mos6522_read(addr, mos6522_reg_names[addr], val); 389 } 390 391 return val; 392 } 393 394 void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) 395 { 396 MOS6522State *s = opaque; 397 MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s); 398 int ctrl; 399 400 trace_mos6522_write(addr, mos6522_reg_names[addr], val); 401 402 switch (addr) { 403 case VIA_REG_B: 404 s->b = (s->b & ~s->dirb) | (val & s->dirb); 405 mdc->portB_write(s); 406 ctrl = (s->pcr & CB2_CTRL_MASK) >> CB2_CTRL_SHIFT; 407 if (!(ctrl & C2_IND)) { 408 s->ifr &= ~CB2_INT; 409 } 410 s->ifr &= ~CB1_INT; 411 mos6522_update_irq(s); 412 break; 413 case VIA_REG_A: 414 qemu_log_mask(LOG_UNIMP, "Write access to register A with handshake"); 415 /* fall through */ 416 case VIA_REG_ANH: 417 s->a = (s->a & ~s->dira) | (val & s->dira); 418 mdc->portA_write(s); 419 ctrl = (s->pcr & CA2_CTRL_MASK) >> CA2_CTRL_SHIFT; 420 if (!(ctrl & C2_IND)) { 421 s->ifr &= ~CA2_INT; 422 } 423 s->ifr &= ~CA1_INT; 424 mos6522_update_irq(s); 425 break; 426 case VIA_REG_DIRB: 427 s->dirb = val; 428 break; 429 case VIA_REG_DIRA: 430 s->dira = val; 431 break; 432 case VIA_REG_T1CL: 433 s->timers[0].latch = (s->timers[0].latch & 0xff00) | val; 434 mos6522_timer1_update(s, &s->timers[0], 435 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 436 break; 437 case VIA_REG_T1CH: 438 s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8); 439 s->ifr &= ~T1_INT; 440 set_counter(s, &s->timers[0], s->timers[0].latch); 441 break; 442 case VIA_REG_T1LL: 443 s->timers[0].latch = (s->timers[0].latch & 0xff00) | val; 444 mos6522_timer1_update(s, &s->timers[0], 445 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 446 break; 447 case VIA_REG_T1LH: 448 s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8); 449 s->ifr &= ~T1_INT; 450 mos6522_timer1_update(s, &s->timers[0], 451 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 452 break; 453 case VIA_REG_T2CL: 454 s->timers[1].latch = (s->timers[1].latch & 0xff00) | val; 455 break; 456 case VIA_REG_T2CH: 457 /* To ensure T2 generates an interrupt on zero crossing with the 458 common timer code, write the value directly from the latch to 459 the counter */ 460 s->timers[1].latch = (s->timers[1].latch & 0xff) | (val << 8); 461 s->ifr &= ~T2_INT; 462 set_counter(s, &s->timers[1], s->timers[1].latch); 463 break; 464 case VIA_REG_SR: 465 s->sr = val; 466 break; 467 case VIA_REG_ACR: 468 s->acr = val; 469 mos6522_timer1_update(s, &s->timers[0], 470 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 471 break; 472 case VIA_REG_PCR: 473 s->pcr = val; 474 break; 475 case VIA_REG_IFR: 476 /* reset bits */ 477 s->ifr &= ~val; 478 mos6522_update_irq(s); 479 break; 480 case VIA_REG_IER: 481 if (val & IER_SET) { 482 /* set bits */ 483 s->ier |= val & 0x7f; 484 } else { 485 /* reset bits */ 486 s->ier &= ~val; 487 } 488 mos6522_update_irq(s); 489 /* if IER is modified starts needed timers */ 490 mos6522_timer1_update(s, &s->timers[0], 491 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 492 mos6522_timer2_update(s, &s->timers[1], 493 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 494 break; 495 default: 496 g_assert_not_reached(); 497 } 498 } 499 500 static int qmp_x_query_via_foreach(Object *obj, void *opaque) 501 { 502 GString *buf = opaque; 503 504 if (object_dynamic_cast(obj, TYPE_MOS6522)) { 505 MOS6522State *s = MOS6522(obj); 506 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 507 uint16_t t1counter = get_counter(s, &s->timers[0]); 508 uint16_t t2counter = get_counter(s, &s->timers[1]); 509 510 g_string_append_printf(buf, "%s:\n", object_get_typename(obj)); 511 512 g_string_append_printf(buf, " Registers:\n"); 513 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 514 mos6522_reg_names[0], s->b); 515 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 516 mos6522_reg_names[1], s->a); 517 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 518 mos6522_reg_names[2], s->dirb); 519 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 520 mos6522_reg_names[3], s->dira); 521 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 522 mos6522_reg_names[4], t1counter & 0xff); 523 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 524 mos6522_reg_names[5], t1counter >> 8); 525 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 526 mos6522_reg_names[6], 527 s->timers[0].latch & 0xff); 528 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 529 mos6522_reg_names[7], 530 s->timers[0].latch >> 8); 531 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 532 mos6522_reg_names[8], t2counter & 0xff); 533 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 534 mos6522_reg_names[9], t2counter >> 8); 535 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 536 mos6522_reg_names[10], s->sr); 537 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 538 mos6522_reg_names[11], s->acr); 539 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 540 mos6522_reg_names[12], s->pcr); 541 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 542 mos6522_reg_names[13], s->ifr); 543 g_string_append_printf(buf, " %-*s: 0x%x\n", 4, 544 mos6522_reg_names[14], s->ier); 545 546 g_string_append_printf(buf, " Timers:\n"); 547 g_string_append_printf(buf, " Using current time now(ns)=%"PRId64 548 "\n", now); 549 g_string_append_printf(buf, " T1 freq(hz)=%"PRId64 550 " mode=%s" 551 " counter=0x%x" 552 " latch=0x%x\n" 553 " load_time(ns)=%"PRId64 554 " next_irq_time(ns)=%"PRId64 "\n", 555 s->timers[0].frequency, 556 ((s->acr & T1MODE) == T1MODE_CONT) ? "continuous" 557 : "one-shot", 558 t1counter, 559 s->timers[0].latch, 560 s->timers[0].load_time, 561 get_next_irq_time(s, &s->timers[0], now)); 562 g_string_append_printf(buf, " T2 freq(hz)=%"PRId64 563 " mode=%s" 564 " counter=0x%x" 565 " latch=0x%x\n" 566 " load_time(ns)=%"PRId64 567 " next_irq_time(ns)=%"PRId64 "\n", 568 s->timers[1].frequency, 569 "one-shot", 570 t2counter, 571 s->timers[1].latch, 572 s->timers[1].load_time, 573 get_next_irq_time(s, &s->timers[1], now)); 574 } 575 576 return 0; 577 } 578 579 static HumanReadableText *qmp_x_query_via(Error **errp) 580 { 581 g_autoptr(GString) buf = g_string_new(""); 582 583 object_child_foreach_recursive(object_get_root(), 584 qmp_x_query_via_foreach, buf); 585 586 return human_readable_text_from_str(buf); 587 } 588 589 void hmp_info_via(Monitor *mon, const QDict *qdict) 590 { 591 Error *err = NULL; 592 g_autoptr(HumanReadableText) info = qmp_x_query_via(&err); 593 594 if (hmp_handle_error(mon, err)) { 595 return; 596 } 597 monitor_puts(mon, info->human_readable_text); 598 } 599 600 static const MemoryRegionOps mos6522_ops = { 601 .read = mos6522_read, 602 .write = mos6522_write, 603 .endianness = DEVICE_NATIVE_ENDIAN, 604 .valid = { 605 .min_access_size = 1, 606 .max_access_size = 1, 607 }, 608 }; 609 610 static const VMStateDescription vmstate_mos6522_timer = { 611 .name = "mos6522_timer", 612 .version_id = 0, 613 .minimum_version_id = 0, 614 .fields = (const VMStateField[]) { 615 VMSTATE_UINT16(latch, MOS6522Timer), 616 VMSTATE_UINT16(counter_value, MOS6522Timer), 617 VMSTATE_INT64(load_time, MOS6522Timer), 618 VMSTATE_INT64(next_irq_time, MOS6522Timer), 619 VMSTATE_TIMER_PTR(timer, MOS6522Timer), 620 VMSTATE_END_OF_LIST() 621 } 622 }; 623 624 const VMStateDescription vmstate_mos6522 = { 625 .name = "mos6522", 626 .version_id = 1, 627 .minimum_version_id = 1, 628 .fields = (const VMStateField[]) { 629 VMSTATE_UINT8(a, MOS6522State), 630 VMSTATE_UINT8(b, MOS6522State), 631 VMSTATE_UINT8(dira, MOS6522State), 632 VMSTATE_UINT8(dirb, MOS6522State), 633 VMSTATE_UINT8(sr, MOS6522State), 634 VMSTATE_UINT8(acr, MOS6522State), 635 VMSTATE_UINT8(pcr, MOS6522State), 636 VMSTATE_UINT8(ifr, MOS6522State), 637 VMSTATE_UINT8(ier, MOS6522State), 638 VMSTATE_UINT8(last_irq_levels, MOS6522State), 639 VMSTATE_STRUCT_ARRAY(timers, MOS6522State, 2, 0, 640 vmstate_mos6522_timer, MOS6522Timer), 641 VMSTATE_END_OF_LIST() 642 } 643 }; 644 645 static void mos6522_reset_hold(Object *obj, ResetType type) 646 { 647 MOS6522State *s = MOS6522(obj); 648 649 s->b = 0; 650 s->a = 0; 651 s->dirb = 0xff; 652 s->dira = 0; 653 s->sr = 0; 654 s->acr = 0; 655 s->pcr = 0; 656 s->ifr = 0; 657 s->ier = 0; 658 /* s->ier = T1_INT | SR_INT; */ 659 660 s->timers[0].frequency = s->frequency; 661 s->timers[0].latch = 0xffff; 662 set_counter(s, &s->timers[0], 0xffff); 663 timer_del(s->timers[0].timer); 664 665 s->timers[1].frequency = s->frequency; 666 s->timers[1].latch = 0xffff; 667 timer_del(s->timers[1].timer); 668 } 669 670 static void mos6522_init(Object *obj) 671 { 672 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 673 MOS6522State *s = MOS6522(obj); 674 int i; 675 676 memory_region_init_io(&s->mem, obj, &mos6522_ops, s, "mos6522", 677 MOS6522_NUM_REGS); 678 sysbus_init_mmio(sbd, &s->mem); 679 sysbus_init_irq(sbd, &s->irq); 680 681 for (i = 0; i < ARRAY_SIZE(s->timers); i++) { 682 s->timers[i].index = i; 683 } 684 685 s->timers[0].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, mos6522_timer1, s); 686 s->timers[1].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, mos6522_timer2, s); 687 688 qdev_init_gpio_in(DEVICE(obj), mos6522_set_irq, VIA_NUM_INTS); 689 } 690 691 static void mos6522_finalize(Object *obj) 692 { 693 MOS6522State *s = MOS6522(obj); 694 695 timer_free(s->timers[0].timer); 696 timer_free(s->timers[1].timer); 697 } 698 699 static Property mos6522_properties[] = { 700 DEFINE_PROP_UINT64("frequency", MOS6522State, frequency, 0), 701 DEFINE_PROP_END_OF_LIST() 702 }; 703 704 static void mos6522_class_init(ObjectClass *oc, void *data) 705 { 706 DeviceClass *dc = DEVICE_CLASS(oc); 707 ResettableClass *rc = RESETTABLE_CLASS(oc); 708 MOS6522DeviceClass *mdc = MOS6522_CLASS(oc); 709 710 rc->phases.hold = mos6522_reset_hold; 711 dc->vmsd = &vmstate_mos6522; 712 device_class_set_props(dc, mos6522_properties); 713 mdc->portB_write = mos6522_portB_write; 714 mdc->portA_write = mos6522_portA_write; 715 mdc->get_timer1_counter_value = mos6522_get_counter_value; 716 mdc->get_timer2_counter_value = mos6522_get_counter_value; 717 mdc->get_timer1_load_time = mos6522_get_load_time; 718 mdc->get_timer2_load_time = mos6522_get_load_time; 719 } 720 721 static const TypeInfo mos6522_type_info = { 722 .name = TYPE_MOS6522, 723 .parent = TYPE_SYS_BUS_DEVICE, 724 .instance_size = sizeof(MOS6522State), 725 .instance_init = mos6522_init, 726 .instance_finalize = mos6522_finalize, 727 .abstract = true, 728 .class_size = sizeof(MOS6522DeviceClass), 729 .class_init = mos6522_class_init, 730 }; 731 732 static void mos6522_register_types(void) 733 { 734 type_register_static(&mos6522_type_info); 735 } 736 737 type_init(mos6522_register_types) 738