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-rw-r--r--hw/timer/Makefile.objs2
-rw-r--r--hw/timer/aspeed_rtc.c180
-rw-r--r--hw/timer/aspeed_timer.c78
-rw-r--r--hw/timer/trace-events4
4 files changed, 233 insertions, 31 deletions
diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
index 0e9a4530f8..123d92c969 100644
--- a/hw/timer/Makefile.objs
+++ b/hw/timer/Makefile.objs
@@ -41,7 +41,7 @@ obj-$(CONFIG_MC146818RTC) += mc146818rtc.o
obj-$(CONFIG_ALLWINNER_A10_PIT) += allwinner-a10-pit.o
common-obj-$(CONFIG_STM32F2XX_TIMER) += stm32f2xx_timer.o
-common-obj-$(CONFIG_ASPEED_SOC) += aspeed_timer.o
+common-obj-$(CONFIG_ASPEED_SOC) += aspeed_timer.o aspeed_rtc.o
common-obj-$(CONFIG_SUN4V_RTC) += sun4v-rtc.o
common-obj-$(CONFIG_CMSDK_APB_TIMER) += cmsdk-apb-timer.o
diff --git a/hw/timer/aspeed_rtc.c b/hw/timer/aspeed_rtc.c
new file mode 100644
index 0000000000..19f061c846
--- /dev/null
+++ b/hw/timer/aspeed_rtc.c
@@ -0,0 +1,180 @@
+/*
+ * ASPEED Real Time Clock
+ * Joel Stanley <joel@jms.id.au>
+ *
+ * Copyright 2019 IBM Corp
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "hw/timer/aspeed_rtc.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+
+#include "trace.h"
+
+#define COUNTER1 (0x00 / 4)
+#define COUNTER2 (0x04 / 4)
+#define ALARM (0x08 / 4)
+#define CONTROL (0x10 / 4)
+#define ALARM_STATUS (0x14 / 4)
+
+#define RTC_UNLOCKED BIT(1)
+#define RTC_ENABLED BIT(0)
+
+static void aspeed_rtc_calc_offset(AspeedRtcState *rtc)
+{
+ struct tm tm;
+ uint32_t year, cent;
+ uint32_t reg1 = rtc->reg[COUNTER1];
+ uint32_t reg2 = rtc->reg[COUNTER2];
+
+ tm.tm_mday = (reg1 >> 24) & 0x1f;
+ tm.tm_hour = (reg1 >> 16) & 0x1f;
+ tm.tm_min = (reg1 >> 8) & 0x3f;
+ tm.tm_sec = (reg1 >> 0) & 0x3f;
+
+ cent = (reg2 >> 16) & 0x1f;
+ year = (reg2 >> 8) & 0x7f;
+ tm.tm_mon = ((reg2 >> 0) & 0x0f) - 1;
+ tm.tm_year = year + (cent * 100) - 1900;
+
+ rtc->offset = qemu_timedate_diff(&tm);
+}
+
+static uint32_t aspeed_rtc_get_counter(AspeedRtcState *rtc, int r)
+{
+ uint32_t year, cent;
+ struct tm now;
+
+ qemu_get_timedate(&now, rtc->offset);
+
+ switch (r) {
+ case COUNTER1:
+ return (now.tm_mday << 24) | (now.tm_hour << 16) |
+ (now.tm_min << 8) | now.tm_sec;
+ case COUNTER2:
+ cent = (now.tm_year + 1900) / 100;
+ year = now.tm_year % 100;
+ return ((cent & 0x1f) << 16) | ((year & 0x7f) << 8) |
+ ((now.tm_mon + 1) & 0xf);
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static uint64_t aspeed_rtc_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ AspeedRtcState *rtc = opaque;
+ uint64_t val;
+ uint32_t r = addr >> 2;
+
+ switch (r) {
+ case COUNTER1:
+ case COUNTER2:
+ if (rtc->reg[CONTROL] & RTC_ENABLED) {
+ rtc->reg[r] = aspeed_rtc_get_counter(rtc, r);
+ }
+ /* fall through */
+ case CONTROL:
+ val = rtc->reg[r];
+ break;
+ case ALARM:
+ case ALARM_STATUS:
+ default:
+ qemu_log_mask(LOG_UNIMP, "%s: 0x%" HWADDR_PRIx "\n", __func__, addr);
+ return 0;
+ }
+
+ trace_aspeed_rtc_read(addr, val);
+
+ return val;
+}
+
+static void aspeed_rtc_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ AspeedRtcState *rtc = opaque;
+ uint32_t r = addr >> 2;
+
+ switch (r) {
+ case COUNTER1:
+ case COUNTER2:
+ if (!(rtc->reg[CONTROL] & RTC_UNLOCKED)) {
+ break;
+ }
+ /* fall through */
+ case CONTROL:
+ rtc->reg[r] = val;
+ aspeed_rtc_calc_offset(rtc);
+ break;
+ case ALARM:
+ case ALARM_STATUS:
+ default:
+ qemu_log_mask(LOG_UNIMP, "%s: 0x%" HWADDR_PRIx "\n", __func__, addr);
+ break;
+ }
+ trace_aspeed_rtc_write(addr, val);
+}
+
+static void aspeed_rtc_reset(DeviceState *d)
+{
+ AspeedRtcState *rtc = ASPEED_RTC(d);
+
+ rtc->offset = 0;
+ memset(rtc->reg, 0, sizeof(rtc->reg));
+}
+
+static const MemoryRegionOps aspeed_rtc_ops = {
+ .read = aspeed_rtc_read,
+ .write = aspeed_rtc_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_aspeed_rtc = {
+ .name = TYPE_ASPEED_RTC,
+ .version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32_ARRAY(reg, AspeedRtcState, 0x18),
+ VMSTATE_INT32(offset, AspeedRtcState),
+ VMSTATE_INT32(offset, AspeedRtcState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void aspeed_rtc_realize(DeviceState *dev, Error **errp)
+{
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+ AspeedRtcState *s = ASPEED_RTC(dev);
+
+ sysbus_init_irq(sbd, &s->irq);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_rtc_ops, s,
+ "aspeed-rtc", 0x18ULL);
+ sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static void aspeed_rtc_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = aspeed_rtc_realize;
+ dc->vmsd = &vmstate_aspeed_rtc;
+ dc->reset = aspeed_rtc_reset;
+}
+
+static const TypeInfo aspeed_rtc_info = {
+ .name = TYPE_ASPEED_RTC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(AspeedRtcState),
+ .class_init = aspeed_rtc_class_init,
+};
+
+static void aspeed_rtc_register_types(void)
+{
+ type_register_static(&aspeed_rtc_info);
+}
+
+type_init(aspeed_rtc_register_types)
diff --git a/hw/timer/aspeed_timer.c b/hw/timer/aspeed_timer.c
index 2c3a4d0fe7..29cc5e8070 100644
--- a/hw/timer/aspeed_timer.c
+++ b/hw/timer/aspeed_timer.c
@@ -107,39 +107,49 @@ static inline uint64_t calculate_time(struct AspeedTimer *t, uint32_t ticks)
return t->start + delta_ns;
}
+static inline uint32_t calculate_match(struct AspeedTimer *t, int i)
+{
+ return t->match[i] < t->reload ? t->match[i] : 0;
+}
+
static uint64_t calculate_next(struct AspeedTimer *t)
{
- uint64_t next = 0;
- uint32_t rate = calculate_rate(t);
+ uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ uint64_t next;
- while (!next) {
- /* We don't know the relationship between the values in the match
- * registers, so sort using MAX/MIN/zero. We sort in that order as the
- * timer counts down to zero. */
- uint64_t seq[] = {
- calculate_time(t, MAX(t->match[0], t->match[1])),
- calculate_time(t, MIN(t->match[0], t->match[1])),
- calculate_time(t, 0),
- };
- uint64_t reload_ns;
- uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
-
- if (now < seq[0]) {
- next = seq[0];
- } else if (now < seq[1]) {
- next = seq[1];
- } else if (now < seq[2]) {
- next = seq[2];
- } else if (t->reload) {
- reload_ns = muldiv64(t->reload, NANOSECONDS_PER_SECOND, rate);
- t->start = now - ((now - t->start) % reload_ns);
- } else {
- /* no reload value, return 0 */
- break;
- }
+ /*
+ * We don't know the relationship between the values in the match
+ * registers, so sort using MAX/MIN/zero. We sort in that order as
+ * the timer counts down to zero.
+ */
+
+ next = calculate_time(t, MAX(calculate_match(t, 0), calculate_match(t, 1)));
+ if (now < next) {
+ return next;
+ }
+
+ next = calculate_time(t, MIN(calculate_match(t, 0), calculate_match(t, 1)));
+ if (now < next) {
+ return next;
}
- return next;
+ next = calculate_time(t, 0);
+ if (now < next) {
+ return next;
+ }
+
+ /* We've missed all deadlines, fire interrupt and try again */
+ timer_del(&t->timer);
+
+ if (timer_overflow_interrupt(t)) {
+ t->level = !t->level;
+ qemu_set_irq(t->irq, t->level);
+ }
+
+ next = MAX(MAX(calculate_match(t, 0), calculate_match(t, 1)), 0);
+ t->start = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ return calculate_time(t, next);
}
static void aspeed_timer_mod(AspeedTimer *t)
@@ -184,7 +194,11 @@ static uint64_t aspeed_timer_get_value(AspeedTimer *t, int reg)
switch (reg) {
case TIMER_REG_STATUS:
- value = calculate_ticks(t, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+ if (timer_enabled(t)) {
+ value = calculate_ticks(t, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+ } else {
+ value = t->reload;
+ }
break;
case TIMER_REG_RELOAD:
value = t->reload;
@@ -261,7 +275,11 @@ static void aspeed_timer_set_value(AspeedTimerCtrlState *s, int timer, int reg,
int64_t delta = (int64_t) value - (int64_t) calculate_ticks(t, now);
uint32_t rate = calculate_rate(t);
- t->start += muldiv64(delta, NANOSECONDS_PER_SECOND, rate);
+ if (delta >= 0) {
+ t->start += muldiv64(delta, NANOSECONDS_PER_SECOND, rate);
+ } else {
+ t->start -= muldiv64(-delta, NANOSECONDS_PER_SECOND, rate);
+ }
aspeed_timer_mod(t);
}
break;
diff --git a/hw/timer/trace-events b/hw/timer/trace-events
index dcaf3d6da6..db02a9142c 100644
--- a/hw/timer/trace-events
+++ b/hw/timer/trace-events
@@ -66,6 +66,10 @@ cmsdk_apb_dualtimer_read(uint64_t offset, uint64_t data, unsigned size) "CMSDK A
cmsdk_apb_dualtimer_write(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB dualtimer write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
cmsdk_apb_dualtimer_reset(void) "CMSDK APB dualtimer: reset"
+# hw/timer/aspeed-rtc.c
+aspeed_rtc_read(uint64_t addr, uint64_t value) "addr 0x%02" PRIx64 " value 0x%08" PRIx64
+aspeed_rtc_write(uint64_t addr, uint64_t value) "addr 0x%02" PRIx64 " value 0x%08" PRIx64
+
# sun4v-rtc.c
sun4v_rtc_read(uint64_t addr, uint64_t value) "read: addr 0x%" PRIx64 " value 0x%" PRIx64
sun4v_rtc_write(uint64_t addr, uint64_t value) "write: addr 0x%" PRIx64 " value 0x%" PRIx64
generated by cgit v1.2.3 (git 2.26.2) at 2025-03-23 15:38:48 +0000