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;
81 target_phys_addr_t base;
86 struct pxa2xx_timer0_s timer[4];
87 struct pxa2xx_timer4_s *tm4;
94 static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)
96 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
102 muldiv64(now_qemu - s->lastload, s->freq, ticks_per_sec);
104 for (i = 0; i < 4; i ++) {
105 new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),
106 ticks_per_sec, s->freq);
107 qemu_mod_timer(s->timer[i].qtimer, new_qemu);
111 static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)
113 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
116 static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };
119 if (s->tm4[n].control & (1 << 7))
122 counter = counters[n];
124 if (!s->tm4[counter].freq) {
125 qemu_del_timer(s->tm4[n].tm.qtimer);
129 now_vm = s->tm4[counter].clock + muldiv64(now_qemu -
130 s->tm4[counter].lastload,
131 s->tm4[counter].freq, ticks_per_sec);
133 new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
134 ticks_per_sec, s->tm4[counter].freq);
135 qemu_mod_timer(s->tm4[n].tm.qtimer, new_qemu);
138 static uint32_t pxa2xx_timer_read(void *opaque, target_phys_addr_t offset)
140 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
150 return s->timer[tm].value;
161 return s->tm4[tm].tm.value;
163 return s->clock + muldiv64(qemu_get_clock(vm_clock) -
164 s->lastload, s->freq, ticks_per_sec);
176 if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {
177 if (s->tm4[tm - 1].freq)
178 s->snapshot = s->tm4[tm - 1].clock + muldiv64(
179 qemu_get_clock(vm_clock) -
180 s->tm4[tm - 1].lastload,
181 s->tm4[tm - 1].freq, ticks_per_sec);
183 s->snapshot = s->tm4[tm - 1].clock;
186 if (!s->tm4[tm].freq)
187 return s->tm4[tm].clock;
188 return s->tm4[tm].clock + muldiv64(qemu_get_clock(vm_clock) -
189 s->tm4[tm].lastload, s->tm4[tm].freq, ticks_per_sec);
191 return s->irq_enabled;
192 case OSSR: /* Status register */
206 return s->tm4[tm].control;
211 cpu_abort(cpu_single_env, "pxa2xx_timer_read: Bad offset "
212 REG_FMT "\n", offset);
218 static void pxa2xx_timer_write(void *opaque, target_phys_addr_t offset,
222 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
231 s->timer[tm].value = value;
232 pxa2xx_timer_update(s, qemu_get_clock(vm_clock));
244 s->tm4[tm].tm.value = value;
245 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
248 s->oldclock = s->clock;
249 s->lastload = qemu_get_clock(vm_clock);
251 pxa2xx_timer_update(s, s->lastload);
263 s->tm4[tm].oldclock = s->tm4[tm].clock;
264 s->tm4[tm].lastload = qemu_get_clock(vm_clock);
265 s->tm4[tm].clock = value;
266 pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
269 s->irq_enabled = value & 0xfff;
271 case OSSR: /* Status register */
273 for (i = 0; i < 4; i ++, value >>= 1) {
274 if (s->timer[i].level && (value & 1)) {
275 s->timer[i].level = 0;
276 qemu_irq_lower(s->timer[i].irq);
280 for (i = 0; i < 8; i ++, value >>= 1)
281 if (s->tm4[i].tm.level && (value & 1))
282 s->tm4[i].tm.level = 0;
283 if (!(s->events & 0xff0))
284 qemu_irq_lower(s->tm4->tm.irq);
287 case OWER: /* XXX: Reset on OSMR3 match? */
296 s->tm4[tm].control = value & 0x0ff;
297 /* XXX Stop if running (shouldn't happen) */
298 if ((value & (1 << 7)) || tm == 0)
299 s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
302 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
311 s->tm4[tm].control = value & 0x3ff;
312 /* XXX Stop if running (shouldn't happen) */
313 if ((value & (1 << 7)) || !(tm & 1))
315 pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)];
318 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
323 cpu_abort(cpu_single_env, "pxa2xx_timer_write: Bad offset "
324 REG_FMT "\n", offset);
328 static CPUReadMemoryFunc *pxa2xx_timer_readfn[] = {
334 static CPUWriteMemoryFunc *pxa2xx_timer_writefn[] = {
340 static void pxa2xx_timer_tick(void *opaque)
342 struct pxa2xx_timer0_s *t = (struct pxa2xx_timer0_s *) opaque;
343 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->info;
345 if (i->irq_enabled & (1 << t->num)) {
347 i->events |= 1 << t->num;
348 qemu_irq_raise(t->irq);
354 qemu_system_reset_request();
358 static void pxa2xx_timer_tick4(void *opaque)
360 struct pxa2xx_timer4_s *t = (struct pxa2xx_timer4_s *) opaque;
361 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->tm.info;
363 pxa2xx_timer_tick(&t->tm);
364 if (t->control & (1 << 3))
366 if (t->control & (1 << 6))
367 pxa2xx_timer_update4(i, qemu_get_clock(vm_clock), t->tm.num - 4);
370 static void pxa2xx_timer_save(QEMUFile *f, void *opaque)
372 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
375 qemu_put_be32s(f, (uint32_t *) &s->clock);
376 qemu_put_be32s(f, (uint32_t *) &s->oldclock);
377 qemu_put_be64s(f, &s->lastload);
379 for (i = 0; i < 4; i ++) {
380 qemu_put_be32s(f, &s->timer[i].value);
381 qemu_put_be32(f, s->timer[i].level);
384 for (i = 0; i < 8; i ++) {
385 qemu_put_be32s(f, &s->tm4[i].tm.value);
386 qemu_put_be32(f, s->tm4[i].tm.level);
387 qemu_put_be32s(f, (uint32_t *) &s->tm4[i].oldclock);
388 qemu_put_be32s(f, (uint32_t *) &s->tm4[i].clock);
389 qemu_put_be64s(f, &s->tm4[i].lastload);
390 qemu_put_be32s(f, &s->tm4[i].freq);
391 qemu_put_be32s(f, &s->tm4[i].control);
394 qemu_put_be32s(f, &s->events);
395 qemu_put_be32s(f, &s->irq_enabled);
396 qemu_put_be32s(f, &s->reset3);
397 qemu_put_be32s(f, &s->snapshot);
400 static int pxa2xx_timer_load(QEMUFile *f, void *opaque, int version_id)
402 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
406 qemu_get_be32s(f, (uint32_t *) &s->clock);
407 qemu_get_be32s(f, (uint32_t *) &s->oldclock);
408 qemu_get_be64s(f, &s->lastload);
410 now = qemu_get_clock(vm_clock);
411 for (i = 0; i < 4; i ++) {
412 qemu_get_be32s(f, &s->timer[i].value);
413 s->timer[i].level = qemu_get_be32(f);
415 pxa2xx_timer_update(s, now);
418 for (i = 0; i < 8; i ++) {
419 qemu_get_be32s(f, &s->tm4[i].tm.value);
420 s->tm4[i].tm.level = qemu_get_be32(f);
421 qemu_get_be32s(f, (uint32_t *) &s->tm4[i].oldclock);
422 qemu_get_be32s(f, (uint32_t *) &s->tm4[i].clock);
423 qemu_get_be64s(f, &s->tm4[i].lastload);
424 qemu_get_be32s(f, &s->tm4[i].freq);
425 qemu_get_be32s(f, &s->tm4[i].control);
426 pxa2xx_timer_update4(s, now, i);
429 qemu_get_be32s(f, &s->events);
430 qemu_get_be32s(f, &s->irq_enabled);
431 qemu_get_be32s(f, &s->reset3);
432 qemu_get_be32s(f, &s->snapshot);
437 static pxa2xx_timer_info *pxa2xx_timer_init(target_phys_addr_t base,
442 pxa2xx_timer_info *s;
444 s = (pxa2xx_timer_info *) qemu_mallocz(sizeof(pxa2xx_timer_info));
449 s->lastload = qemu_get_clock(vm_clock);
452 for (i = 0; i < 4; i ++) {
453 s->timer[i].value = 0;
454 s->timer[i].irq = irqs[i];
455 s->timer[i].info = s;
457 s->timer[i].level = 0;
458 s->timer[i].qtimer = qemu_new_timer(vm_clock,
459 pxa2xx_timer_tick, &s->timer[i]);
462 iomemtype = cpu_register_io_memory(0, pxa2xx_timer_readfn,
463 pxa2xx_timer_writefn, s);
464 cpu_register_physical_memory(base, 0x00001000, iomemtype);
466 register_savevm("pxa2xx_timer", 0, 0,
467 pxa2xx_timer_save, pxa2xx_timer_load, s);
472 void pxa25x_timer_init(target_phys_addr_t base, qemu_irq *irqs)
474 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
475 s->freq = PXA25X_FREQ;
479 void pxa27x_timer_init(target_phys_addr_t base,
480 qemu_irq *irqs, qemu_irq irq4)
482 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
484 s->freq = PXA27X_FREQ;
485 s->tm4 = (struct pxa2xx_timer4_s *) qemu_mallocz(8 *
486 sizeof(struct pxa2xx_timer4_s));
487 for (i = 0; i < 8; i ++) {
488 s->tm4[i].tm.value = 0;
489 s->tm4[i].tm.irq = irq4;
490 s->tm4[i].tm.info = s;
491 s->tm4[i].tm.num = i + 4;
492 s->tm4[i].tm.level = 0;
494 s->tm4[i].control = 0x0;
495 s->tm4[i].tm.qtimer = qemu_new_timer(vm_clock,
496 pxa2xx_timer_tick4, &s->tm4[i]);