pxa2xx_timer.c (17750B)
1/* 2 * Intel XScale PXA255/270 OS Timers. 3 * 4 * Copyright (c) 2006 Openedhand Ltd. 5 * Copyright (c) 2006 Thorsten Zitterell 6 * 7 * This code is licensed under the GPL. 8 */ 9 10#include "qemu/osdep.h" 11#include "hw/irq.h" 12#include "hw/qdev-properties.h" 13#include "qemu/timer.h" 14#include "sysemu/runstate.h" 15#include "hw/arm/pxa.h" 16#include "hw/sysbus.h" 17#include "migration/vmstate.h" 18#include "qemu/log.h" 19#include "qemu/module.h" 20#include "qom/object.h" 21 22#define OSMR0 0x00 23#define OSMR1 0x04 24#define OSMR2 0x08 25#define OSMR3 0x0c 26#define OSMR4 0x80 27#define OSMR5 0x84 28#define OSMR6 0x88 29#define OSMR7 0x8c 30#define OSMR8 0x90 31#define OSMR9 0x94 32#define OSMR10 0x98 33#define OSMR11 0x9c 34#define OSCR 0x10 /* OS Timer Count */ 35#define OSCR4 0x40 36#define OSCR5 0x44 37#define OSCR6 0x48 38#define OSCR7 0x4c 39#define OSCR8 0x50 40#define OSCR9 0x54 41#define OSCR10 0x58 42#define OSCR11 0x5c 43#define OSSR 0x14 /* Timer status register */ 44#define OWER 0x18 45#define OIER 0x1c /* Interrupt enable register 3-0 to E3-E0 */ 46#define OMCR4 0xc0 /* OS Match Control registers */ 47#define OMCR5 0xc4 48#define OMCR6 0xc8 49#define OMCR7 0xcc 50#define OMCR8 0xd0 51#define OMCR9 0xd4 52#define OMCR10 0xd8 53#define OMCR11 0xdc 54#define OSNR 0x20 55 56#define PXA25X_FREQ 3686400 /* 3.6864 MHz */ 57#define PXA27X_FREQ 3250000 /* 3.25 MHz */ 58 59static int pxa2xx_timer4_freq[8] = { 60 [0] = 0, 61 [1] = 32768, 62 [2] = 1000, 63 [3] = 1, 64 [4] = 1000000, 65 /* [5] is the "Externally supplied clock". Assign if necessary. */ 66 [5 ... 7] = 0, 67}; 68 69#define TYPE_PXA2XX_TIMER "pxa2xx-timer" 70OBJECT_DECLARE_SIMPLE_TYPE(PXA2xxTimerInfo, PXA2XX_TIMER) 71 72 73typedef struct { 74 uint32_t value; 75 qemu_irq irq; 76 QEMUTimer *qtimer; 77 int num; 78 PXA2xxTimerInfo *info; 79} PXA2xxTimer0; 80 81typedef struct { 82 PXA2xxTimer0 tm; 83 int32_t oldclock; 84 int32_t clock; 85 uint64_t lastload; 86 uint32_t freq; 87 uint32_t control; 88} PXA2xxTimer4; 89 90struct PXA2xxTimerInfo { 91 SysBusDevice parent_obj; 92 93 MemoryRegion iomem; 94 uint32_t flags; 95 96 int32_t clock; 97 int32_t oldclock; 98 uint64_t lastload; 99 uint32_t freq; 100 PXA2xxTimer0 timer[4]; 101 uint32_t events; 102 uint32_t irq_enabled; 103 uint32_t reset3; 104 uint32_t snapshot; 105 106 qemu_irq irq4; 107 PXA2xxTimer4 tm4[8]; 108}; 109 110#define PXA2XX_TIMER_HAVE_TM4 0 111 112static inline int pxa2xx_timer_has_tm4(PXA2xxTimerInfo *s) 113{ 114 return s->flags & (1 << PXA2XX_TIMER_HAVE_TM4); 115} 116 117static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu) 118{ 119 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque; 120 int i; 121 uint32_t now_vm; 122 uint64_t new_qemu; 123 124 now_vm = s->clock + 125 muldiv64(now_qemu - s->lastload, s->freq, NANOSECONDS_PER_SECOND); 126 127 for (i = 0; i < 4; i ++) { 128 new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm), 129 NANOSECONDS_PER_SECOND, s->freq); 130 timer_mod(s->timer[i].qtimer, new_qemu); 131 } 132} 133 134static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n) 135{ 136 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque; 137 uint32_t now_vm; 138 uint64_t new_qemu; 139 static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 }; 140 int counter; 141 142 assert(n < ARRAY_SIZE(counters)); 143 if (s->tm4[n].control & (1 << 7)) 144 counter = n; 145 else 146 counter = counters[n]; 147 148 if (!s->tm4[counter].freq) { 149 timer_del(s->tm4[n].tm.qtimer); 150 return; 151 } 152 153 now_vm = s->tm4[counter].clock + muldiv64(now_qemu - 154 s->tm4[counter].lastload, 155 s->tm4[counter].freq, NANOSECONDS_PER_SECOND); 156 157 new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm), 158 NANOSECONDS_PER_SECOND, s->tm4[counter].freq); 159 timer_mod(s->tm4[n].tm.qtimer, new_qemu); 160} 161 162static uint64_t pxa2xx_timer_read(void *opaque, hwaddr offset, 163 unsigned size) 164{ 165 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque; 166 int tm = 0; 167 168 switch (offset) { 169 case OSMR3: tm ++; 170 /* fall through */ 171 case OSMR2: tm ++; 172 /* fall through */ 173 case OSMR1: tm ++; 174 /* fall through */ 175 case OSMR0: 176 return s->timer[tm].value; 177 case OSMR11: tm ++; 178 /* fall through */ 179 case OSMR10: tm ++; 180 /* fall through */ 181 case OSMR9: tm ++; 182 /* fall through */ 183 case OSMR8: tm ++; 184 /* fall through */ 185 case OSMR7: tm ++; 186 /* fall through */ 187 case OSMR6: tm ++; 188 /* fall through */ 189 case OSMR5: tm ++; 190 /* fall through */ 191 case OSMR4: 192 if (!pxa2xx_timer_has_tm4(s)) 193 goto badreg; 194 return s->tm4[tm].tm.value; 195 case OSCR: 196 return s->clock + muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - 197 s->lastload, s->freq, NANOSECONDS_PER_SECOND); 198 case OSCR11: tm ++; 199 /* fall through */ 200 case OSCR10: tm ++; 201 /* fall through */ 202 case OSCR9: tm ++; 203 /* fall through */ 204 case OSCR8: tm ++; 205 /* fall through */ 206 case OSCR7: tm ++; 207 /* fall through */ 208 case OSCR6: tm ++; 209 /* fall through */ 210 case OSCR5: tm ++; 211 /* fall through */ 212 case OSCR4: 213 if (!pxa2xx_timer_has_tm4(s)) 214 goto badreg; 215 216 if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) { 217 if (s->tm4[tm - 1].freq) 218 s->snapshot = s->tm4[tm - 1].clock + muldiv64( 219 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - 220 s->tm4[tm - 1].lastload, 221 s->tm4[tm - 1].freq, NANOSECONDS_PER_SECOND); 222 else 223 s->snapshot = s->tm4[tm - 1].clock; 224 } 225 226 if (!s->tm4[tm].freq) 227 return s->tm4[tm].clock; 228 return s->tm4[tm].clock + 229 muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - 230 s->tm4[tm].lastload, s->tm4[tm].freq, 231 NANOSECONDS_PER_SECOND); 232 case OIER: 233 return s->irq_enabled; 234 case OSSR: /* Status register */ 235 return s->events; 236 case OWER: 237 return s->reset3; 238 case OMCR11: tm ++; 239 /* fall through */ 240 case OMCR10: tm ++; 241 /* fall through */ 242 case OMCR9: tm ++; 243 /* fall through */ 244 case OMCR8: tm ++; 245 /* fall through */ 246 case OMCR7: tm ++; 247 /* fall through */ 248 case OMCR6: tm ++; 249 /* fall through */ 250 case OMCR5: tm ++; 251 /* fall through */ 252 case OMCR4: 253 if (!pxa2xx_timer_has_tm4(s)) 254 goto badreg; 255 return s->tm4[tm].control; 256 case OSNR: 257 return s->snapshot; 258 default: 259 qemu_log_mask(LOG_UNIMP, 260 "%s: unknown register 0x%02" HWADDR_PRIx "\n", 261 __func__, offset); 262 break; 263 badreg: 264 qemu_log_mask(LOG_GUEST_ERROR, 265 "%s: incorrect register 0x%02" HWADDR_PRIx "\n", 266 __func__, offset); 267 } 268 269 return 0; 270} 271 272static void pxa2xx_timer_write(void *opaque, hwaddr offset, 273 uint64_t value, unsigned size) 274{ 275 int i, tm = 0; 276 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque; 277 278 switch (offset) { 279 case OSMR3: tm ++; 280 /* fall through */ 281 case OSMR2: tm ++; 282 /* fall through */ 283 case OSMR1: tm ++; 284 /* fall through */ 285 case OSMR0: 286 s->timer[tm].value = value; 287 pxa2xx_timer_update(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 288 break; 289 case OSMR11: tm ++; 290 /* fall through */ 291 case OSMR10: tm ++; 292 /* fall through */ 293 case OSMR9: tm ++; 294 /* fall through */ 295 case OSMR8: tm ++; 296 /* fall through */ 297 case OSMR7: tm ++; 298 /* fall through */ 299 case OSMR6: tm ++; 300 /* fall through */ 301 case OSMR5: tm ++; 302 /* fall through */ 303 case OSMR4: 304 if (!pxa2xx_timer_has_tm4(s)) 305 goto badreg; 306 s->tm4[tm].tm.value = value; 307 pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm); 308 break; 309 case OSCR: 310 s->oldclock = s->clock; 311 s->lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 312 s->clock = value; 313 pxa2xx_timer_update(s, s->lastload); 314 break; 315 case OSCR11: tm ++; 316 /* fall through */ 317 case OSCR10: tm ++; 318 /* fall through */ 319 case OSCR9: tm ++; 320 /* fall through */ 321 case OSCR8: tm ++; 322 /* fall through */ 323 case OSCR7: tm ++; 324 /* fall through */ 325 case OSCR6: tm ++; 326 /* fall through */ 327 case OSCR5: tm ++; 328 /* fall through */ 329 case OSCR4: 330 if (!pxa2xx_timer_has_tm4(s)) 331 goto badreg; 332 s->tm4[tm].oldclock = s->tm4[tm].clock; 333 s->tm4[tm].lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 334 s->tm4[tm].clock = value; 335 pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm); 336 break; 337 case OIER: 338 s->irq_enabled = value & 0xfff; 339 break; 340 case OSSR: /* Status register */ 341 value &= s->events; 342 s->events &= ~value; 343 for (i = 0; i < 4; i ++, value >>= 1) 344 if (value & 1) 345 qemu_irq_lower(s->timer[i].irq); 346 if (pxa2xx_timer_has_tm4(s) && !(s->events & 0xff0) && value) 347 qemu_irq_lower(s->irq4); 348 break; 349 case OWER: /* XXX: Reset on OSMR3 match? */ 350 s->reset3 = value; 351 break; 352 case OMCR7: tm ++; 353 /* fall through */ 354 case OMCR6: tm ++; 355 /* fall through */ 356 case OMCR5: tm ++; 357 /* fall through */ 358 case OMCR4: 359 if (!pxa2xx_timer_has_tm4(s)) 360 goto badreg; 361 s->tm4[tm].control = value & 0x0ff; 362 /* XXX Stop if running (shouldn't happen) */ 363 if ((value & (1 << 7)) || tm == 0) 364 s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7]; 365 else { 366 s->tm4[tm].freq = 0; 367 pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm); 368 } 369 break; 370 case OMCR11: tm ++; 371 /* fall through */ 372 case OMCR10: tm ++; 373 /* fall through */ 374 case OMCR9: tm ++; 375 /* fall through */ 376 case OMCR8: tm += 4; 377 if (!pxa2xx_timer_has_tm4(s)) 378 goto badreg; 379 s->tm4[tm].control = value & 0x3ff; 380 /* XXX Stop if running (shouldn't happen) */ 381 if ((value & (1 << 7)) || !(tm & 1)) 382 s->tm4[tm].freq = 383 pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)]; 384 else { 385 s->tm4[tm].freq = 0; 386 pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm); 387 } 388 break; 389 default: 390 qemu_log_mask(LOG_UNIMP, 391 "%s: unknown register 0x%02" HWADDR_PRIx " " 392 "(value 0x%08" PRIx64 ")\n", __func__, offset, value); 393 break; 394 badreg: 395 qemu_log_mask(LOG_GUEST_ERROR, 396 "%s: incorrect register 0x%02" HWADDR_PRIx " " 397 "(value 0x%08" PRIx64 ")\n", __func__, offset, value); 398 } 399} 400 401static const MemoryRegionOps pxa2xx_timer_ops = { 402 .read = pxa2xx_timer_read, 403 .write = pxa2xx_timer_write, 404 .endianness = DEVICE_NATIVE_ENDIAN, 405}; 406 407static void pxa2xx_timer_tick(void *opaque) 408{ 409 PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque; 410 PXA2xxTimerInfo *i = t->info; 411 412 if (i->irq_enabled & (1 << t->num)) { 413 i->events |= 1 << t->num; 414 qemu_irq_raise(t->irq); 415 } 416 417 if (t->num == 3) 418 if (i->reset3 & 1) { 419 i->reset3 = 0; 420 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 421 } 422} 423 424static void pxa2xx_timer_tick4(void *opaque) 425{ 426 PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque; 427 PXA2xxTimerInfo *i = (PXA2xxTimerInfo *) t->tm.info; 428 429 pxa2xx_timer_tick(&t->tm); 430 if (t->control & (1 << 3)) 431 t->clock = 0; 432 if (t->control & (1 << 6)) 433 pxa2xx_timer_update4(i, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), t->tm.num - 4); 434 if (i->events & 0xff0) 435 qemu_irq_raise(i->irq4); 436} 437 438static int pxa25x_timer_post_load(void *opaque, int version_id) 439{ 440 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque; 441 int64_t now; 442 int i; 443 444 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 445 pxa2xx_timer_update(s, now); 446 447 if (pxa2xx_timer_has_tm4(s)) 448 for (i = 0; i < 8; i ++) 449 pxa2xx_timer_update4(s, now, i); 450 451 return 0; 452} 453 454static void pxa2xx_timer_init(Object *obj) 455{ 456 PXA2xxTimerInfo *s = PXA2XX_TIMER(obj); 457 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 458 459 s->irq_enabled = 0; 460 s->oldclock = 0; 461 s->clock = 0; 462 s->lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 463 s->reset3 = 0; 464 465 memory_region_init_io(&s->iomem, obj, &pxa2xx_timer_ops, s, 466 "pxa2xx-timer", 0x00001000); 467 sysbus_init_mmio(dev, &s->iomem); 468} 469 470static void pxa2xx_timer_realize(DeviceState *dev, Error **errp) 471{ 472 PXA2xxTimerInfo *s = PXA2XX_TIMER(dev); 473 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 474 int i; 475 476 for (i = 0; i < 4; i ++) { 477 s->timer[i].value = 0; 478 sysbus_init_irq(sbd, &s->timer[i].irq); 479 s->timer[i].info = s; 480 s->timer[i].num = i; 481 s->timer[i].qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 482 pxa2xx_timer_tick, &s->timer[i]); 483 } 484 485 if (s->flags & (1 << PXA2XX_TIMER_HAVE_TM4)) { 486 sysbus_init_irq(sbd, &s->irq4); 487 488 for (i = 0; i < 8; i ++) { 489 s->tm4[i].tm.value = 0; 490 s->tm4[i].tm.info = s; 491 s->tm4[i].tm.num = i + 4; 492 s->tm4[i].freq = 0; 493 s->tm4[i].control = 0x0; 494 s->tm4[i].tm.qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 495 pxa2xx_timer_tick4, &s->tm4[i]); 496 } 497 } 498} 499 500static const VMStateDescription vmstate_pxa2xx_timer0_regs = { 501 .name = "pxa2xx_timer0", 502 .version_id = 2, 503 .minimum_version_id = 2, 504 .fields = (VMStateField[]) { 505 VMSTATE_UINT32(value, PXA2xxTimer0), 506 VMSTATE_END_OF_LIST(), 507 }, 508}; 509 510static const VMStateDescription vmstate_pxa2xx_timer4_regs = { 511 .name = "pxa2xx_timer4", 512 .version_id = 1, 513 .minimum_version_id = 1, 514 .fields = (VMStateField[]) { 515 VMSTATE_STRUCT(tm, PXA2xxTimer4, 1, 516 vmstate_pxa2xx_timer0_regs, PXA2xxTimer0), 517 VMSTATE_INT32(oldclock, PXA2xxTimer4), 518 VMSTATE_INT32(clock, PXA2xxTimer4), 519 VMSTATE_UINT64(lastload, PXA2xxTimer4), 520 VMSTATE_UINT32(freq, PXA2xxTimer4), 521 VMSTATE_UINT32(control, PXA2xxTimer4), 522 VMSTATE_END_OF_LIST(), 523 }, 524}; 525 526static bool pxa2xx_timer_has_tm4_test(void *opaque, int version_id) 527{ 528 return pxa2xx_timer_has_tm4(opaque); 529} 530 531static const VMStateDescription vmstate_pxa2xx_timer_regs = { 532 .name = "pxa2xx_timer", 533 .version_id = 1, 534 .minimum_version_id = 1, 535 .post_load = pxa25x_timer_post_load, 536 .fields = (VMStateField[]) { 537 VMSTATE_INT32(clock, PXA2xxTimerInfo), 538 VMSTATE_INT32(oldclock, PXA2xxTimerInfo), 539 VMSTATE_UINT64(lastload, PXA2xxTimerInfo), 540 VMSTATE_STRUCT_ARRAY(timer, PXA2xxTimerInfo, 4, 1, 541 vmstate_pxa2xx_timer0_regs, PXA2xxTimer0), 542 VMSTATE_UINT32(events, PXA2xxTimerInfo), 543 VMSTATE_UINT32(irq_enabled, PXA2xxTimerInfo), 544 VMSTATE_UINT32(reset3, PXA2xxTimerInfo), 545 VMSTATE_UINT32(snapshot, PXA2xxTimerInfo), 546 VMSTATE_STRUCT_ARRAY_TEST(tm4, PXA2xxTimerInfo, 8, 547 pxa2xx_timer_has_tm4_test, 0, 548 vmstate_pxa2xx_timer4_regs, PXA2xxTimer4), 549 VMSTATE_END_OF_LIST(), 550 } 551}; 552 553static Property pxa25x_timer_dev_properties[] = { 554 DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA25X_FREQ), 555 DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags, 556 PXA2XX_TIMER_HAVE_TM4, false), 557 DEFINE_PROP_END_OF_LIST(), 558}; 559 560static void pxa25x_timer_dev_class_init(ObjectClass *klass, void *data) 561{ 562 DeviceClass *dc = DEVICE_CLASS(klass); 563 564 dc->desc = "PXA25x timer"; 565 device_class_set_props(dc, pxa25x_timer_dev_properties); 566} 567 568static const TypeInfo pxa25x_timer_dev_info = { 569 .name = "pxa25x-timer", 570 .parent = TYPE_PXA2XX_TIMER, 571 .instance_size = sizeof(PXA2xxTimerInfo), 572 .class_init = pxa25x_timer_dev_class_init, 573}; 574 575static Property pxa27x_timer_dev_properties[] = { 576 DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA27X_FREQ), 577 DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags, 578 PXA2XX_TIMER_HAVE_TM4, true), 579 DEFINE_PROP_END_OF_LIST(), 580}; 581 582static void pxa27x_timer_dev_class_init(ObjectClass *klass, void *data) 583{ 584 DeviceClass *dc = DEVICE_CLASS(klass); 585 586 dc->desc = "PXA27x timer"; 587 device_class_set_props(dc, pxa27x_timer_dev_properties); 588} 589 590static const TypeInfo pxa27x_timer_dev_info = { 591 .name = "pxa27x-timer", 592 .parent = TYPE_PXA2XX_TIMER, 593 .instance_size = sizeof(PXA2xxTimerInfo), 594 .class_init = pxa27x_timer_dev_class_init, 595}; 596 597static void pxa2xx_timer_class_init(ObjectClass *oc, void *data) 598{ 599 DeviceClass *dc = DEVICE_CLASS(oc); 600 601 dc->realize = pxa2xx_timer_realize; 602 dc->vmsd = &vmstate_pxa2xx_timer_regs; 603} 604 605static const TypeInfo pxa2xx_timer_type_info = { 606 .name = TYPE_PXA2XX_TIMER, 607 .parent = TYPE_SYS_BUS_DEVICE, 608 .instance_size = sizeof(PXA2xxTimerInfo), 609 .instance_init = pxa2xx_timer_init, 610 .abstract = true, 611 .class_init = pxa2xx_timer_class_init, 612}; 613 614static void pxa2xx_timer_register_types(void) 615{ 616 type_register_static(&pxa2xx_timer_type_info); 617 type_register_static(&pxa25x_timer_dev_info); 618 type_register_static(&pxa27x_timer_dev_info); 619} 620 621type_init(pxa2xx_timer_register_types)