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"
27 #define OSCR 0x10 /* OS Timer Count */
36 #define OSSR 0x14 /* Timer status register */
38 #define OIER 0x1c /* Interrupt enable register 3-0 to E3-E0 */
39 #define OMCR4 0xc0 /* OS Match Control registers */
49 #define PXA25X_FREQ 3686400 /* 3.6864 MHz */
50 #define PXA27X_FREQ 3250000 /* 3.25 MHz */
52 static int pxa2xx_timer4_freq[8] = {
58 /* [5] is the "Externally supplied clock". Assign if necessary. */
62 struct pxa2xx_timer0_s {
71 struct pxa2xx_timer4_s {
72 struct pxa2xx_timer0_s tm;
85 struct pxa2xx_timer0_s timer[4];
86 struct pxa2xx_timer4_s *tm4;
93 static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)
95 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
101 muldiv64(now_qemu - s->lastload, s->freq, ticks_per_sec);
103 for (i = 0; i < 4; i ++) {
104 new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),
105 ticks_per_sec, s->freq);
106 qemu_mod_timer(s->timer[i].qtimer, new_qemu);
110 static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)
112 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
115 static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };
118 if (s->tm4[n].control & (1 << 7))
121 counter = counters[n];
123 if (!s->tm4[counter].freq) {
124 qemu_del_timer(s->tm4[n].tm.qtimer);
128 now_vm = s->tm4[counter].clock + muldiv64(now_qemu -
129 s->tm4[counter].lastload,
130 s->tm4[counter].freq, ticks_per_sec);
132 new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
133 ticks_per_sec, s->tm4[counter].freq);
134 qemu_mod_timer(s->tm4[n].tm.qtimer, new_qemu);
137 static uint32_t pxa2xx_timer_read(void *opaque, target_phys_addr_t offset)
139 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
147 return s->timer[tm].value;
158 return s->tm4[tm].tm.value;
160 return s->clock + muldiv64(qemu_get_clock(vm_clock) -
161 s->lastload, s->freq, ticks_per_sec);
173 if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {
174 if (s->tm4[tm - 1].freq)
175 s->snapshot = s->tm4[tm - 1].clock + muldiv64(
176 qemu_get_clock(vm_clock) -
177 s->tm4[tm - 1].lastload,
178 s->tm4[tm - 1].freq, ticks_per_sec);
180 s->snapshot = s->tm4[tm - 1].clock;
183 if (!s->tm4[tm].freq)
184 return s->tm4[tm].clock;
185 return s->tm4[tm].clock + muldiv64(qemu_get_clock(vm_clock) -
186 s->tm4[tm].lastload, s->tm4[tm].freq, ticks_per_sec);
188 return s->irq_enabled;
189 case OSSR: /* Status register */
203 return s->tm4[tm].control;
208 cpu_abort(cpu_single_env, "pxa2xx_timer_read: Bad offset "
209 REG_FMT "\n", offset);
215 static void pxa2xx_timer_write(void *opaque, target_phys_addr_t offset,
219 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
226 s->timer[tm].value = value;
227 pxa2xx_timer_update(s, qemu_get_clock(vm_clock));
239 s->tm4[tm].tm.value = value;
240 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
243 s->oldclock = s->clock;
244 s->lastload = qemu_get_clock(vm_clock);
246 pxa2xx_timer_update(s, s->lastload);
258 s->tm4[tm].oldclock = s->tm4[tm].clock;
259 s->tm4[tm].lastload = qemu_get_clock(vm_clock);
260 s->tm4[tm].clock = value;
261 pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
264 s->irq_enabled = value & 0xfff;
266 case OSSR: /* Status register */
268 for (i = 0; i < 4; i ++, value >>= 1) {
269 if (s->timer[i].level && (value & 1)) {
270 s->timer[i].level = 0;
271 qemu_irq_lower(s->timer[i].irq);
275 for (i = 0; i < 8; i ++, value >>= 1)
276 if (s->tm4[i].tm.level && (value & 1))
277 s->tm4[i].tm.level = 0;
278 if (!(s->events & 0xff0))
279 qemu_irq_lower(s->tm4->tm.irq);
282 case OWER: /* XXX: Reset on OSMR3 match? */
291 s->tm4[tm].control = value & 0x0ff;
292 /* XXX Stop if running (shouldn't happen) */
293 if ((value & (1 << 7)) || tm == 0)
294 s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
297 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
306 s->tm4[tm].control = value & 0x3ff;
307 /* XXX Stop if running (shouldn't happen) */
308 if ((value & (1 << 7)) || !(tm & 1))
310 pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)];
313 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
318 cpu_abort(cpu_single_env, "pxa2xx_timer_write: Bad offset "
319 REG_FMT "\n", offset);
323 static CPUReadMemoryFunc *pxa2xx_timer_readfn[] = {
329 static CPUWriteMemoryFunc *pxa2xx_timer_writefn[] = {
335 static void pxa2xx_timer_tick(void *opaque)
337 struct pxa2xx_timer0_s *t = (struct pxa2xx_timer0_s *) opaque;
338 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->info;
340 if (i->irq_enabled & (1 << t->num)) {
342 i->events |= 1 << t->num;
343 qemu_irq_raise(t->irq);
349 qemu_system_reset_request();
353 static void pxa2xx_timer_tick4(void *opaque)
355 struct pxa2xx_timer4_s *t = (struct pxa2xx_timer4_s *) opaque;
356 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->tm.info;
358 pxa2xx_timer_tick(&t->tm);
359 if (t->control & (1 << 3))
361 if (t->control & (1 << 6))
362 pxa2xx_timer_update4(i, qemu_get_clock(vm_clock), t->tm.num - 4);
365 static void pxa2xx_timer_save(QEMUFile *f, void *opaque)
367 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
370 qemu_put_be32s(f, (uint32_t *) &s->clock);
371 qemu_put_be32s(f, (uint32_t *) &s->oldclock);
372 qemu_put_be64s(f, &s->lastload);
374 for (i = 0; i < 4; i ++) {
375 qemu_put_be32s(f, &s->timer[i].value);
376 qemu_put_be32(f, s->timer[i].level);
379 for (i = 0; i < 8; i ++) {
380 qemu_put_be32s(f, &s->tm4[i].tm.value);
381 qemu_put_be32(f, s->tm4[i].tm.level);
382 qemu_put_sbe32s(f, &s->tm4[i].oldclock);
383 qemu_put_sbe32s(f, &s->tm4[i].clock);
384 qemu_put_be64s(f, &s->tm4[i].lastload);
385 qemu_put_be32s(f, &s->tm4[i].freq);
386 qemu_put_be32s(f, &s->tm4[i].control);
389 qemu_put_be32s(f, &s->events);
390 qemu_put_be32s(f, &s->irq_enabled);
391 qemu_put_be32s(f, &s->reset3);
392 qemu_put_be32s(f, &s->snapshot);
395 static int pxa2xx_timer_load(QEMUFile *f, void *opaque, int version_id)
397 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
401 qemu_get_be32s(f, (uint32_t *) &s->clock);
402 qemu_get_be32s(f, (uint32_t *) &s->oldclock);
403 qemu_get_be64s(f, &s->lastload);
405 now = qemu_get_clock(vm_clock);
406 for (i = 0; i < 4; i ++) {
407 qemu_get_be32s(f, &s->timer[i].value);
408 s->timer[i].level = qemu_get_be32(f);
410 pxa2xx_timer_update(s, now);
413 for (i = 0; i < 8; i ++) {
414 qemu_get_be32s(f, &s->tm4[i].tm.value);
415 s->tm4[i].tm.level = qemu_get_be32(f);
416 qemu_get_sbe32s(f, &s->tm4[i].oldclock);
417 qemu_get_sbe32s(f, &s->tm4[i].clock);
418 qemu_get_be64s(f, &s->tm4[i].lastload);
419 qemu_get_be32s(f, &s->tm4[i].freq);
420 qemu_get_be32s(f, &s->tm4[i].control);
421 pxa2xx_timer_update4(s, now, i);
424 qemu_get_be32s(f, &s->events);
425 qemu_get_be32s(f, &s->irq_enabled);
426 qemu_get_be32s(f, &s->reset3);
427 qemu_get_be32s(f, &s->snapshot);
432 static pxa2xx_timer_info *pxa2xx_timer_init(target_phys_addr_t base,
437 pxa2xx_timer_info *s;
439 s = (pxa2xx_timer_info *) qemu_mallocz(sizeof(pxa2xx_timer_info));
443 s->lastload = qemu_get_clock(vm_clock);
446 for (i = 0; i < 4; i ++) {
447 s->timer[i].value = 0;
448 s->timer[i].irq = irqs[i];
449 s->timer[i].info = s;
451 s->timer[i].level = 0;
452 s->timer[i].qtimer = qemu_new_timer(vm_clock,
453 pxa2xx_timer_tick, &s->timer[i]);
456 iomemtype = cpu_register_io_memory(0, pxa2xx_timer_readfn,
457 pxa2xx_timer_writefn, s);
458 cpu_register_physical_memory(base, 0x00001000, iomemtype);
460 register_savevm("pxa2xx_timer", 0, 0,
461 pxa2xx_timer_save, pxa2xx_timer_load, s);
466 void pxa25x_timer_init(target_phys_addr_t base, qemu_irq *irqs)
468 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
469 s->freq = PXA25X_FREQ;
473 void pxa27x_timer_init(target_phys_addr_t base,
474 qemu_irq *irqs, qemu_irq irq4)
476 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
478 s->freq = PXA27X_FREQ;
479 s->tm4 = (struct pxa2xx_timer4_s *) qemu_mallocz(8 *
480 sizeof(struct pxa2xx_timer4_s));
481 for (i = 0; i < 8; i ++) {
482 s->tm4[i].tm.value = 0;
483 s->tm4[i].tm.irq = irq4;
484 s->tm4[i].tm.info = s;
485 s->tm4[i].tm.num = i + 4;
486 s->tm4[i].tm.level = 0;
488 s->tm4[i].control = 0x0;
489 s->tm4[i].tm.qtimer = qemu_new_timer(vm_clock,
490 pxa2xx_timer_tick4, &s->tm4[i]);