2 * Intel XScale PXA255/270 OS Timers.
4 * Copyright (c) 2006 Openedhand Ltd.
5 * Copyright (c) 2006 Thorsten Zitterell
7 * This code is licenced under the GPL.
11 #include "qemu-timer.h"
28 #define OSCR 0x10 /* OS Timer Count */
37 #define OSSR 0x14 /* Timer status register */
39 #define OIER 0x1c /* Interrupt enable register 3-0 to E3-E0 */
40 #define OMCR4 0xc0 /* OS Match Control registers */
50 #define PXA25X_FREQ 3686400 /* 3.6864 MHz */
51 #define PXA27X_FREQ 3250000 /* 3.25 MHz */
53 static int pxa2xx_timer4_freq[8] = {
59 /* [5] is the "Externally supplied clock". Assign if necessary. */
63 typedef struct PXA2xxTimerInfo PXA2xxTimerInfo;
70 PXA2xxTimerInfo *info;
82 struct PXA2xxTimerInfo {
90 PXA2xxTimer0 timer[4];
100 #define PXA2XX_TIMER_HAVE_TM4 0
102 static inline int pxa2xx_timer_has_tm4(PXA2xxTimerInfo *s)
104 return s->flags & (1 << PXA2XX_TIMER_HAVE_TM4);
107 static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)
109 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
115 muldiv64(now_qemu - s->lastload, s->freq, get_ticks_per_sec());
117 for (i = 0; i < 4; i ++) {
118 new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),
119 get_ticks_per_sec(), s->freq);
120 qemu_mod_timer(s->timer[i].qtimer, new_qemu);
124 static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)
126 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
129 static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };
132 if (s->tm4[n].control & (1 << 7))
135 counter = counters[n];
137 if (!s->tm4[counter].freq) {
138 qemu_del_timer(s->tm4[n].tm.qtimer);
142 now_vm = s->tm4[counter].clock + muldiv64(now_qemu -
143 s->tm4[counter].lastload,
144 s->tm4[counter].freq, get_ticks_per_sec());
146 new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
147 get_ticks_per_sec(), s->tm4[counter].freq);
148 qemu_mod_timer(s->tm4[n].tm.qtimer, new_qemu);
151 static uint32_t pxa2xx_timer_read(void *opaque, target_phys_addr_t offset)
153 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
161 return s->timer[tm].value;
170 if (!pxa2xx_timer_has_tm4(s))
172 return s->tm4[tm].tm.value;
174 return s->clock + muldiv64(qemu_get_clock(vm_clock) -
175 s->lastload, s->freq, get_ticks_per_sec());
184 if (!pxa2xx_timer_has_tm4(s))
187 if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {
188 if (s->tm4[tm - 1].freq)
189 s->snapshot = s->tm4[tm - 1].clock + muldiv64(
190 qemu_get_clock(vm_clock) -
191 s->tm4[tm - 1].lastload,
192 s->tm4[tm - 1].freq, get_ticks_per_sec());
194 s->snapshot = s->tm4[tm - 1].clock;
197 if (!s->tm4[tm].freq)
198 return s->tm4[tm].clock;
199 return s->tm4[tm].clock + muldiv64(qemu_get_clock(vm_clock) -
200 s->tm4[tm].lastload, s->tm4[tm].freq, get_ticks_per_sec());
202 return s->irq_enabled;
203 case OSSR: /* Status register */
215 if (!pxa2xx_timer_has_tm4(s))
217 return s->tm4[tm].control;
222 hw_error("pxa2xx_timer_read: Bad offset " REG_FMT "\n", offset);
228 static void pxa2xx_timer_write(void *opaque, target_phys_addr_t offset,
232 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
239 s->timer[tm].value = value;
240 pxa2xx_timer_update(s, qemu_get_clock(vm_clock));
250 if (!pxa2xx_timer_has_tm4(s))
252 s->tm4[tm].tm.value = value;
253 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
256 s->oldclock = s->clock;
257 s->lastload = qemu_get_clock(vm_clock);
259 pxa2xx_timer_update(s, s->lastload);
269 if (!pxa2xx_timer_has_tm4(s))
271 s->tm4[tm].oldclock = s->tm4[tm].clock;
272 s->tm4[tm].lastload = qemu_get_clock(vm_clock);
273 s->tm4[tm].clock = value;
274 pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
277 s->irq_enabled = value & 0xfff;
279 case OSSR: /* Status register */
282 for (i = 0; i < 4; i ++, value >>= 1)
284 qemu_irq_lower(s->timer[i].irq);
285 if (pxa2xx_timer_has_tm4(s) && !(s->events & 0xff0) && value)
286 qemu_irq_lower(s->irq4);
288 case OWER: /* XXX: Reset on OSMR3 match? */
295 if (!pxa2xx_timer_has_tm4(s))
297 s->tm4[tm].control = value & 0x0ff;
298 /* XXX Stop if running (shouldn't happen) */
299 if ((value & (1 << 7)) || tm == 0)
300 s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
303 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
310 if (!pxa2xx_timer_has_tm4(s))
312 s->tm4[tm].control = value & 0x3ff;
313 /* XXX Stop if running (shouldn't happen) */
314 if ((value & (1 << 7)) || !(tm & 1))
316 pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)];
319 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
324 hw_error("pxa2xx_timer_write: Bad offset " REG_FMT "\n", offset);
328 static CPUReadMemoryFunc * const pxa2xx_timer_readfn[] = {
334 static CPUWriteMemoryFunc * const pxa2xx_timer_writefn[] = {
340 static void pxa2xx_timer_tick(void *opaque)
342 PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque;
343 PXA2xxTimerInfo *i = t->info;
345 if (i->irq_enabled & (1 << t->num)) {
346 i->events |= 1 << t->num;
347 qemu_irq_raise(t->irq);
353 qemu_system_reset_request();
357 static void pxa2xx_timer_tick4(void *opaque)
359 PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque;
360 PXA2xxTimerInfo *i = (PXA2xxTimerInfo *) t->tm.info;
362 pxa2xx_timer_tick(&t->tm);
363 if (t->control & (1 << 3))
365 if (t->control & (1 << 6))
366 pxa2xx_timer_update4(i, qemu_get_clock(vm_clock), t->tm.num - 4);
367 if (i->events & 0xff0)
368 qemu_irq_raise(i->irq4);
371 static int pxa25x_timer_post_load(void *opaque, int version_id)
373 PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
377 now = qemu_get_clock(vm_clock);
378 pxa2xx_timer_update(s, now);
380 if (pxa2xx_timer_has_tm4(s))
381 for (i = 0; i < 8; i ++)
382 pxa2xx_timer_update4(s, now, i);
387 static int pxa2xx_timer_init(SysBusDevice *dev)
393 s = FROM_SYSBUS(PXA2xxTimerInfo, dev);
397 s->lastload = qemu_get_clock(vm_clock);
400 for (i = 0; i < 4; i ++) {
401 s->timer[i].value = 0;
402 sysbus_init_irq(dev, &s->timer[i].irq);
403 s->timer[i].info = s;
405 s->timer[i].qtimer = qemu_new_timer(vm_clock,
406 pxa2xx_timer_tick, &s->timer[i]);
408 if (s->flags & (1 << PXA2XX_TIMER_HAVE_TM4)) {
409 sysbus_init_irq(dev, &s->irq4);
411 for (i = 0; i < 8; i ++) {
412 s->tm4[i].tm.value = 0;
413 s->tm4[i].tm.info = s;
414 s->tm4[i].tm.num = i + 4;
416 s->tm4[i].control = 0x0;
417 s->tm4[i].tm.qtimer = qemu_new_timer(vm_clock,
418 pxa2xx_timer_tick4, &s->tm4[i]);
422 iomemtype = cpu_register_io_memory(pxa2xx_timer_readfn,
423 pxa2xx_timer_writefn, s, DEVICE_NATIVE_ENDIAN);
424 sysbus_init_mmio(dev, 0x00001000, iomemtype);
429 static const VMStateDescription vmstate_pxa2xx_timer0_regs = {
430 .name = "pxa2xx_timer0",
432 .minimum_version_id = 2,
433 .minimum_version_id_old = 2,
434 .fields = (VMStateField[]) {
435 VMSTATE_UINT32(value, PXA2xxTimer0),
436 VMSTATE_END_OF_LIST(),
440 static const VMStateDescription vmstate_pxa2xx_timer4_regs = {
441 .name = "pxa2xx_timer4",
443 .minimum_version_id = 1,
444 .minimum_version_id_old = 1,
445 .fields = (VMStateField[]) {
446 VMSTATE_STRUCT(tm, PXA2xxTimer4, 1,
447 vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),
448 VMSTATE_INT32(oldclock, PXA2xxTimer4),
449 VMSTATE_INT32(clock, PXA2xxTimer4),
450 VMSTATE_UINT64(lastload, PXA2xxTimer4),
451 VMSTATE_UINT32(freq, PXA2xxTimer4),
452 VMSTATE_UINT32(control, PXA2xxTimer4),
453 VMSTATE_END_OF_LIST(),
457 static bool pxa2xx_timer_has_tm4_test(void *opaque, int version_id)
459 return pxa2xx_timer_has_tm4(opaque);
462 static const VMStateDescription vmstate_pxa2xx_timer_regs = {
463 .name = "pxa2xx_timer",
465 .minimum_version_id = 1,
466 .minimum_version_id_old = 1,
467 .post_load = pxa25x_timer_post_load,
468 .fields = (VMStateField[]) {
469 VMSTATE_INT32(clock, PXA2xxTimerInfo),
470 VMSTATE_INT32(oldclock, PXA2xxTimerInfo),
471 VMSTATE_UINT64(lastload, PXA2xxTimerInfo),
472 VMSTATE_STRUCT_ARRAY(timer, PXA2xxTimerInfo, 4, 1,
473 vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),
474 VMSTATE_UINT32(events, PXA2xxTimerInfo),
475 VMSTATE_UINT32(irq_enabled, PXA2xxTimerInfo),
476 VMSTATE_UINT32(reset3, PXA2xxTimerInfo),
477 VMSTATE_UINT32(snapshot, PXA2xxTimerInfo),
478 VMSTATE_STRUCT_ARRAY_TEST(tm4, PXA2xxTimerInfo, 8,
479 pxa2xx_timer_has_tm4_test, 0,
480 vmstate_pxa2xx_timer4_regs, PXA2xxTimer4),
481 VMSTATE_END_OF_LIST(),
485 static SysBusDeviceInfo pxa25x_timer_dev_info = {
486 .init = pxa2xx_timer_init,
487 .qdev.name = "pxa25x-timer",
488 .qdev.desc = "PXA25x timer",
489 .qdev.size = sizeof(PXA2xxTimerInfo),
490 .qdev.vmsd = &vmstate_pxa2xx_timer_regs,
491 .qdev.props = (Property[]) {
492 DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA25X_FREQ),
493 DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,
494 PXA2XX_TIMER_HAVE_TM4, false),
495 DEFINE_PROP_END_OF_LIST(),
499 static SysBusDeviceInfo pxa27x_timer_dev_info = {
500 .init = pxa2xx_timer_init,
501 .qdev.name = "pxa27x-timer",
502 .qdev.desc = "PXA27x timer",
503 .qdev.size = sizeof(PXA2xxTimerInfo),
504 .qdev.vmsd = &vmstate_pxa2xx_timer_regs,
505 .qdev.props = (Property[]) {
506 DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA27X_FREQ),
507 DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,
508 PXA2XX_TIMER_HAVE_TM4, true),
509 DEFINE_PROP_END_OF_LIST(),
513 static void pxa2xx_timer_register(void)
515 sysbus_register_withprop(&pxa25x_timer_dev_info);
516 sysbus_register_withprop(&pxa27x_timer_dev_info);
518 device_init(pxa2xx_timer_register);