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