From: Kuo-Jung Su <dant...@faraday-tech.com>
The FTTMR010 provides three independent sets of sub-timers.
Each sub-timer can use either the internal system clock (PCLK)
or the external clock (EXTCLK) for clock counting.
Two match registers are provided for each sub-timer, whenever
the value of the match registers equals any one value of the
sub-timers, the timer interrupt will be immediately triggered.
And it would also issue an interrupt when an overflow occurs.
Signed-off-by: Kuo-Jung Su <dant...@faraday-tech.com>
---
hw/fttmr010.c | 468 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 468 insertions(+)
create mode 100644 hw/fttmr010.c
diff --git a/hw/fttmr010.c b/hw/fttmr010.c
new file mode 100644
index 0000000..d0ad93f
--- /dev/null
+++ b/hw/fttmr010.c
@@ -0,0 +1,468 @@
+/*
+ * Faraday FTTMR010 Timer.
+ *
+ * Copyright (c) 2012 Faraday Technology
+ * Written by Dante Su <dant...@faraday-tech.com>
+ *
+ * This code is licensed under the GNU GPL v2.
+ */
+
+#include "hw.h"
+#include "qemu/timer.h"
+#include "sysemu/sysemu.h"
+#include "sysbus.h"
+
+#define REG_TMR_ID(off) ((off) >> 4)
+#define REG_TMR_COUNTER 0x00
+#define REG_TMR_RELOAD 0x04
+#define REG_TMR_MATCH1 0x08
+#define REG_TMR_MATCH2 0x0C
+
+#define REG_CR 0x30
+#define REG_ISR 0x34
+#define REG_IMR 0x38
+#define REG_REV 0x3C
+
+/* timer enable */
+#define CR_TMR_EN(id) (0x01 << ((id) * 3))
+/* timer overflow interrupt enable */
+#define CR_TMR_OFEN(id) (0x04 << ((id) * 3))
+/* timer count-up mode */
+#define CR_TMR_COUNTUP(id) (0x01 << (9 + (id)))
+
+/* timer match 1 */
+#define ISR_MATCH1(id) (0x01 << ((id) * 3))
+/* timer match 2 */
+#define ISR_MATCH2(id) (0x02 << ((id) * 3))
+/* timer overflow */
+#define ISR_OF(id) (0x04 << ((id) * 3))
+
+#define TYPE_FTTMR010 "fttmr010"
+#define TYPE_FTTMR010_TIMER "fttmr010_timer"
+
+typedef struct Fttmr010State fttmr010_state;
+
+typedef struct Fttmr010Timer {
+ int id;
+ int up;
+ fttmr010_state *chip;
+ qemu_irq irq;
+ QEMUTimer *qtimer;
+ uint64_t start;
+ uint32_t intr_match1:1;
+ uint32_t intr_match2:1;
+
+ /* HW register caches */
+ uint64_t counter;
+ uint64_t reload;
+ uint32_t match1;
+ uint32_t match2;
+
+} fttmr010_timer;
+
+struct Fttmr010State {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
+ qemu_irq irq;
+ fttmr010_timer timer[3];
+ uint32_t freq; /* desired source clock */
+ uint64_t step; /* get_ticks_per_sec() / freq */
+
+ /* HW register caches */
+ uint32_t cr;
+ uint32_t isr;
+ uint32_t imr;
+};
+
+#define FTTMR010(obj) \
+ OBJECT_CHECK(fttmr010_state, obj, TYPE_FTTMR010)
+
+static void fttmr010_timer_restart(fttmr010_timer *t)
+{
+ fttmr010_state *s = t->chip;
+ uint64_t interval;
+ int pending = 0;
+
+ t->intr_match1 = 0;
+ t->intr_match2 = 0;
+
+ /* check match1 */
+ if (t->up && t->match1 <= t->counter) {
+ t->intr_match1 = 1;
+ }
+ if (!t->up && t->match1 >= t->counter) {
+ t->intr_match1 = 1;
+ }
+ if (t->match1 == t->counter) {
+ s->isr |= ISR_MATCH1(t->id);
+ ++pending;
+ }
+
+ /* check match2 */
+ if (t->up && t->match2 <= t->counter) {
+ t->intr_match2 = 1;
+ }
+ if (!t->up && t->match2 >= t->counter) {
+ t->intr_match2 = 1;
+ }
+ if (t->match2 == t->counter) {
+ s->isr |= ISR_MATCH2(t->id);
+ ++pending;
+ }
+
+ /* determine delay interval */
+ if (t->up) {
+ if ((t->match1 > t->counter) && (t->match2 > t->counter)) {
+ interval = MIN(t->match1, t->match2) - t->counter;
+ } else if (t->match1 > t->counter) {
+ interval = t->match1 - t->counter;
+ } else if (t->match2 > t->reload) {
+ interval = t->match2 - t->counter;
+ } else {
+ interval = 0xffffffffULL - t->counter;
+ }
+ } else {
+ if ((t->match1 < t->counter) && (t->match2 < t->counter)) {
+ interval = t->counter - MAX(t->match1, t->match2);
+ } else if (t->match1 < t->reload) {
+ interval = t->counter - t->match1;
+ } else if (t->match2 < t->reload) {
+ interval = t->counter - t->match2;
+ } else {
+ interval = t->counter;
+ }
+ }
+
+ if (pending) {
+ qemu_irq_pulse(s->irq);
+ qemu_irq_pulse(t->irq);
+ }
+ t->start = qemu_get_clock_ns(vm_clock);
+ qemu_mod_timer(t->qtimer, t->start + interval * s->step);
+}
+
+static uint64_t fttmr010_update_counter(fttmr010_timer *t)
+{
+ fttmr010_state *s = t->chip;
+ uint64_t now = qemu_get_clock_ns(vm_clock);
+ uint64_t elapsed;
+ int pending = 0;
+
+ if (s->cr & CR_TMR_EN(t->id)) {
+ /* get elapsed time */
+ elapsed = (now - t->start) / s->step;
+
+ /* convert to count-up/count-down value */
+ if (t->up) {
+ t->counter = t->counter + elapsed;
+ } else {
+ if (t->counter > elapsed) {
+ t->counter -= elapsed;
+ } else {
+ t->counter = 0;
+ }
+ }
+ t->start = now;
+
+ /* check match1 */
+ if (!t->intr_match1) {
+ if (t->up && t->match1 <= t->counter) {
+ t->intr_match1 = 1;
+ s->isr |= ISR_MATCH1(t->id);
+ ++pending;
+ }
+ if (!t->up && t->match1 >= t->counter) {
+ t->intr_match1 = 1;
+ s->isr |= ISR_MATCH1(t->id);
+ ++pending;
+ }
+ }
+
+ /* check match2 */
+ if (!t->intr_match2) {
+ if (t->up && t->match2 <= t->counter) {
+ t->intr_match2 = 1;
+ s->isr |= ISR_MATCH2(t->id);
+ ++pending;
+ }
+ if (!t->up && t->match2 >= t->counter) {
+ t->intr_match2 = 1;
+ s->isr |= ISR_MATCH2(t->id);
+ ++pending;
+ }
+ }
+
+ /* check overflow/underflow */
+ if (t->up && t->counter >= 0xffffffffULL) {
+ if (s->cr & CR_TMR_OFEN(t->id)) {
+ s->isr |= ISR_OF(t->id);
+ ++pending;
+ }
+ t->counter = t->reload;
+ fttmr010_timer_restart(t);
+ }
+ if (!t->up && t->counter == 0) {
+ if (s->cr & CR_TMR_OFEN(t->id)) {
+ s->isr |= ISR_OF(t->id);
+ ++pending;
+ }
+ t->counter = t->reload;
+ fttmr010_timer_restart(t);
+ }
+ }
+
+ if (pending) {
+ qemu_irq_pulse(s->irq);
+ qemu_irq_pulse(t->irq);
+ }
+
+ return t->counter;
+}
+
+static uint64_t fttmr010_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+ fttmr010_state *s = FTTMR010(opaque);
+ fttmr010_timer *t;
+ uint64_t ret = 0;
+
+ switch (addr) {
+ case REG_CR:
+ return s->cr;
+ case REG_ISR:
+ return s->isr;
+ case REG_IMR:
+ return s->imr;
+ case REG_REV:
+ return 0x00010801;
+ default:
+ if (addr < 0x30) {
+ t = s->timer + REG_TMR_ID(addr);
+ switch (addr & 0x0f) {
+ case REG_TMR_COUNTER:
+ ret = fttmr010_update_counter(t);
+ break;
+ case REG_TMR_RELOAD:
+ return t->reload;
+ case REG_TMR_MATCH1:
+ return t->match1;
+ case REG_TMR_MATCH2:
+ return t->match2;
+ }
+ }
+ break;
+ }
+
+ return ret;
+}
+
+static void fttmr010_mem_write(void *opaque,
+ hwaddr addr,
+ uint64_t val,
+ unsigned size)
+{
+ fttmr010_state *s = FTTMR010(opaque);
+ fttmr010_timer *t;
+ int i;
+
+ switch (addr) {
+ case REG_CR:
+ s->cr = (uint32_t)val;
+ for (i = 0; i < 3; ++i) {
+ t = s->timer + i;
+ if (s->cr & CR_TMR_COUNTUP(t->id)) {
+ t->up = 1;
+ } else {
+ t->up = 0;
+ }
+ if (s->cr & CR_TMR_EN(t->id)) {
+ fttmr010_timer_restart(t);
+ } else {
+ qemu_del_timer(t->qtimer);
+ }
+ }
+ break;
+ case REG_ISR:
+ s->isr &= ~((uint32_t)val);
+ break;
+ case REG_IMR:
+ s->imr = (uint32_t)val;
+ break;
+ default:
+ if (addr < 0x30) {
+ t = s->timer + REG_TMR_ID(addr);
+ switch (addr & 0x0f) {
+ case REG_TMR_COUNTER:
+ t->counter = (uint32_t)val;
+ break;
+ case REG_TMR_RELOAD:
+ t->reload = (uint32_t)val;
+ break;
+ case REG_TMR_MATCH1:
+ t->match1 = (uint32_t)val;
+ break;
+ case REG_TMR_MATCH2:
+ t->match2 = (uint32_t)val;
+ break;
+ }
+ }
+ break;
+ }
+}
+
+static const MemoryRegionOps fttmr010_ops = {
+ .read = fttmr010_mem_read,
+ .write = fttmr010_mem_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void fttmr010_timer_tick(void *opaque)
+{
+ fttmr010_timer *t = opaque;
+ fttmr010_state *s = t->chip;
+ uint64_t now;
+
+ /* if the timer has been enabled/started */
+ if (!(s->cr & CR_TMR_EN(t->id))) {
+ return;
+ }
+
+ fttmr010_update_counter(t);
+
+ if (t->reload == t->counter) {
+ return;
+ }
+
+ now = qemu_get_clock_ns(vm_clock);
+
+ if (t->up) {
+ if (!t->intr_match1 && t->match1 > t->counter) {
+ qemu_mod_timer(t->qtimer,
+ now + (t->match1 - t->counter) * s->step);
+ } else if (!t->intr_match2 && t->match2 > t->counter) {
+ qemu_mod_timer(t->qtimer,
+ now + (t->match2 - t->counter) * s->step);
+ } else {
+ qemu_mod_timer(t->qtimer,
+ now + (0xffffffffULL - t->counter) * s->step);
+ }
+ } else {
+ if (!t->intr_match1 && t->match1 < t->counter) {
+ qemu_mod_timer(t->qtimer,
+ now + (t->counter - t->match1) * s->step);
+ } else if (!t->intr_match2 && t->match2 < t->counter) {
+ qemu_mod_timer(t->qtimer,
+ now + (t->counter - t->match2) * s->step);
+ } else {
+ qemu_mod_timer(t->qtimer,
+ now + t->counter * s->step);
+ }
+ }
+}
+
+static void fttmr010_reset(DeviceState *ds)
+{
+ SysBusDevice *busdev = SYS_BUS_DEVICE(ds);
+ fttmr010_state *s = FTTMR010(FROM_SYSBUS(fttmr010_state, busdev));
+ int i;
+
+ s->cr = 0;
+ s->isr = 0;
+ s->imr = 0;
+ qemu_irq_lower(s->irq);
+
+ for (i = 0; i < 3; ++i) {
+ s->timer[i].counter = 0;
+ s->timer[i].reload = 0;
+ s->timer[i].match1 = 0;
+ s->timer[i].match2 = 0;
+ qemu_irq_lower(s->timer[i].irq);
+ qemu_del_timer(s->timer[i].qtimer);
+ }
+}
+
+static int fttmr010_init(SysBusDevice *dev)
+{
+ fttmr010_state *s = FTTMR010(FROM_SYSBUS(fttmr010_state, dev));
+ int i;
+
+ s->step = (uint64_t)get_ticks_per_sec() / (uint64_t)s->freq;
+
+ printf("qemu: fttmr010 freq=%d\n", s->freq);
+
+ memory_region_init_io(&s->iomem,
+ &fttmr010_ops,
+ s,
+ TYPE_FTTMR010,
+ 0x1000);
+ sysbus_init_mmio(dev, &s->iomem);
+ sysbus_init_irq(dev, &s->irq);
+ for (i = 0; i < 3; ++i) {
+ s->timer[i].id = i;
+ s->timer[i].chip = s;
+ s->timer[i].qtimer = qemu_new_timer_ns(vm_clock,
+ fttmr010_timer_tick, &s->timer[i]);
+ sysbus_init_irq(dev, &s->timer[i].irq);
+ }
+
+ return 0;
+}
+
+static const VMStateDescription vmstate_fttmr010_timer = {
+ .name = TYPE_FTTMR010_TIMER,
+ .version_id = 2,
+ .minimum_version_id = 2,
+ .minimum_version_id_old = 2,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64(counter, fttmr010_timer),
+ VMSTATE_UINT64(reload, fttmr010_timer),
+ VMSTATE_UINT32(match1, fttmr010_timer),
+ VMSTATE_UINT32(match2, fttmr010_timer),
+ VMSTATE_END_OF_LIST(),
+ },
+};
+
+static const VMStateDescription vmstate_fttmr010 = {
+ .name = TYPE_FTTMR010,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(cr, fttmr010_state),
+ VMSTATE_UINT32(isr, fttmr010_state),
+ VMSTATE_UINT32(imr, fttmr010_state),
+ VMSTATE_STRUCT_ARRAY(timer, fttmr010_state, 3, 1,
+ vmstate_fttmr010_timer, fttmr010_timer),
+ VMSTATE_END_OF_LIST(),
+ }
+};
+
+static Property fttmr010_properties[] = {
+ DEFINE_PROP_UINT32("freq", fttmr010_state, freq, 66000000),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void fttmr010_class_init(ObjectClass *klass, void *data)
+{
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ k->init = fttmr010_init;
+ dc->vmsd = &vmstate_fttmr010;
+ dc->props = fttmr010_properties;
+ dc->reset = fttmr010_reset;
+ dc->no_user = 1;
+}
+
+static const TypeInfo fttmr010_info = {
+ .name = TYPE_FTTMR010,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(fttmr010_state),
+ .class_init = fttmr010_class_init,
+};
+
+static void fttmr010_register_types(void)
+{
+ type_register_static(&fttmr010_info);
+}
+
+type_init(fttmr010_register_types)
--
1.7.9.5
