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. */
85 PXA2xxTimer0 timer[4];
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, get_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 get_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, get_ticks_per_sec());
132 new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
133 get_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, get_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, get_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, get_ticks_per_sec());
188 return s->irq_enabled;
189 case OSSR: /* Status register */
203 return s->tm4[tm].control;
208 hw_error("pxa2xx_timer_read: Bad offset " REG_FMT "\n", offset);
214 static void pxa2xx_timer_write(void *opaque, target_phys_addr_t offset,
218 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
225 s->timer[tm].value = value;
226 pxa2xx_timer_update(s, qemu_get_clock(vm_clock));
238 s->tm4[tm].tm.value = value;
239 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
242 s->oldclock = s->clock;
243 s->lastload = qemu_get_clock(vm_clock);
245 pxa2xx_timer_update(s, s->lastload);
257 s->tm4[tm].oldclock = s->tm4[tm].clock;
258 s->tm4[tm].lastload = qemu_get_clock(vm_clock);
259 s->tm4[tm].clock = value;
260 pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
263 s->irq_enabled = value & 0xfff;
265 case OSSR: /* Status register */
267 for (i = 0; i < 4; i ++, value >>= 1) {
268 if (s->timer[i].level && (value & 1)) {
269 s->timer[i].level = 0;
270 qemu_irq_lower(s->timer[i].irq);
274 for (i = 0; i < 8; i ++, value >>= 1)
275 if (s->tm4[i].tm.level && (value & 1))
276 s->tm4[i].tm.level = 0;
277 if (!(s->events & 0xff0))
278 qemu_irq_lower(s->tm4->tm.irq);
281 case OWER: /* XXX: Reset on OSMR3 match? */
290 s->tm4[tm].control = value & 0x0ff;
291 /* XXX Stop if running (shouldn't happen) */
292 if ((value & (1 << 7)) || tm == 0)
293 s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
296 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
305 s->tm4[tm].control = value & 0x3ff;
306 /* XXX Stop if running (shouldn't happen) */
307 if ((value & (1 << 7)) || !(tm & 1))
309 pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)];
312 pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
317 hw_error("pxa2xx_timer_write: Bad offset " REG_FMT "\n", offset);
321 static CPUReadMemoryFunc * const pxa2xx_timer_readfn[] = {
327 static CPUWriteMemoryFunc * const pxa2xx_timer_writefn[] = {
333 static void pxa2xx_timer_tick(void *opaque)
335 PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque;
336 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->info;
338 if (i->irq_enabled & (1 << t->num)) {
340 i->events |= 1 << t->num;
341 qemu_irq_raise(t->irq);
347 qemu_system_reset_request();
351 static void pxa2xx_timer_tick4(void *opaque)
353 PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque;
354 pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->tm.info;
356 pxa2xx_timer_tick(&t->tm);
357 if (t->control & (1 << 3))
359 if (t->control & (1 << 6))
360 pxa2xx_timer_update4(i, qemu_get_clock(vm_clock), t->tm.num - 4);
363 static void pxa2xx_timer_save(QEMUFile *f, void *opaque)
365 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
368 qemu_put_be32s(f, (uint32_t *) &s->clock);
369 qemu_put_be32s(f, (uint32_t *) &s->oldclock);
370 qemu_put_be64s(f, &s->lastload);
372 for (i = 0; i < 4; i ++) {
373 qemu_put_be32s(f, &s->timer[i].value);
374 qemu_put_be32(f, s->timer[i].level);
377 for (i = 0; i < 8; i ++) {
378 qemu_put_be32s(f, &s->tm4[i].tm.value);
379 qemu_put_be32(f, s->tm4[i].tm.level);
380 qemu_put_sbe32s(f, &s->tm4[i].oldclock);
381 qemu_put_sbe32s(f, &s->tm4[i].clock);
382 qemu_put_be64s(f, &s->tm4[i].lastload);
383 qemu_put_be32s(f, &s->tm4[i].freq);
384 qemu_put_be32s(f, &s->tm4[i].control);
387 qemu_put_be32s(f, &s->events);
388 qemu_put_be32s(f, &s->irq_enabled);
389 qemu_put_be32s(f, &s->reset3);
390 qemu_put_be32s(f, &s->snapshot);
393 static int pxa2xx_timer_load(QEMUFile *f, void *opaque, int version_id)
395 pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
399 qemu_get_be32s(f, (uint32_t *) &s->clock);
400 qemu_get_be32s(f, (uint32_t *) &s->oldclock);
401 qemu_get_be64s(f, &s->lastload);
403 now = qemu_get_clock(vm_clock);
404 for (i = 0; i < 4; i ++) {
405 qemu_get_be32s(f, &s->timer[i].value);
406 s->timer[i].level = qemu_get_be32(f);
408 pxa2xx_timer_update(s, now);
411 for (i = 0; i < 8; i ++) {
412 qemu_get_be32s(f, &s->tm4[i].tm.value);
413 s->tm4[i].tm.level = qemu_get_be32(f);
414 qemu_get_sbe32s(f, &s->tm4[i].oldclock);
415 qemu_get_sbe32s(f, &s->tm4[i].clock);
416 qemu_get_be64s(f, &s->tm4[i].lastload);
417 qemu_get_be32s(f, &s->tm4[i].freq);
418 qemu_get_be32s(f, &s->tm4[i].control);
419 pxa2xx_timer_update4(s, now, i);
422 qemu_get_be32s(f, &s->events);
423 qemu_get_be32s(f, &s->irq_enabled);
424 qemu_get_be32s(f, &s->reset3);
425 qemu_get_be32s(f, &s->snapshot);
430 static pxa2xx_timer_info *pxa2xx_timer_init(target_phys_addr_t base,
435 pxa2xx_timer_info *s;
437 s = (pxa2xx_timer_info *) qemu_mallocz(sizeof(pxa2xx_timer_info));
441 s->lastload = qemu_get_clock(vm_clock);
444 for (i = 0; i < 4; i ++) {
445 s->timer[i].value = 0;
446 s->timer[i].irq = irqs[i];
447 s->timer[i].info = s;
449 s->timer[i].level = 0;
450 s->timer[i].qtimer = qemu_new_timer(vm_clock,
451 pxa2xx_timer_tick, &s->timer[i]);
454 iomemtype = cpu_register_io_memory(pxa2xx_timer_readfn,
455 pxa2xx_timer_writefn, s);
456 cpu_register_physical_memory(base, 0x00001000, iomemtype);
458 register_savevm(NULL, "pxa2xx_timer", 0, 0,
459 pxa2xx_timer_save, pxa2xx_timer_load, s);
464 void pxa25x_timer_init(target_phys_addr_t base, qemu_irq *irqs)
466 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
467 s->freq = PXA25X_FREQ;
471 void pxa27x_timer_init(target_phys_addr_t base,
472 qemu_irq *irqs, qemu_irq irq4)
474 pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
476 s->freq = PXA27X_FREQ;
477 s->tm4 = (PXA2xxTimer4 *) qemu_mallocz(8 *
478 sizeof(PXA2xxTimer4));
479 for (i = 0; i < 8; i ++) {
480 s->tm4[i].tm.value = 0;
481 s->tm4[i].tm.irq = irq4;
482 s->tm4[i].tm.info = s;
483 s->tm4[i].tm.num = i + 4;
484 s->tm4[i].tm.level = 0;
486 s->tm4[i].control = 0x0;
487 s->tm4[i].tm.qtimer = qemu_new_timer(vm_clock,
488 pxa2xx_timer_tick4, &s->tm4[i]);