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-rw-r--r--hw/timer/Kconfig3
-rw-r--r--hw/timer/armv7m_systick.c118
-rw-r--r--hw/timer/meson.build1
-rw-r--r--hw/timer/stellaris-gptm.c332
4 files changed, 425 insertions, 29 deletions
diff --git a/hw/timer/Kconfig b/hw/timer/Kconfig
index bac2511715..1e73da7e12 100644
--- a/hw/timer/Kconfig
+++ b/hw/timer/Kconfig
@@ -52,5 +52,8 @@ config SSE_COUNTER
config SSE_TIMER
bool
+config STELLARIS_GPTM
+ bool
+
config AVR_TIMER16
bool
diff --git a/hw/timer/armv7m_systick.c b/hw/timer/armv7m_systick.c
index 2f192011eb..3bd951dd04 100644
--- a/hw/timer/armv7m_systick.c
+++ b/hw/timer/armv7m_systick.c
@@ -14,28 +14,32 @@
#include "migration/vmstate.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
+#include "hw/qdev-clock.h"
#include "qemu/timer.h"
#include "qemu/log.h"
#include "qemu/module.h"
+#include "qapi/error.h"
#include "trace.h"
-/* qemu timers run at 1GHz. We want something closer to 1MHz. */
-#define SYSTICK_SCALE 1000ULL
-
#define SYSTICK_ENABLE (1 << 0)
#define SYSTICK_TICKINT (1 << 1)
#define SYSTICK_CLKSOURCE (1 << 2)
#define SYSTICK_COUNTFLAG (1 << 16)
-int system_clock_scale;
+#define SYSCALIB_NOREF (1U << 31)
+#define SYSCALIB_SKEW (1U << 30)
+#define SYSCALIB_TENMS ((1U << 24) - 1)
-/* Conversion factor from qemu timer to SysTick frequencies. */
-static inline int64_t systick_scale(SysTickState *s)
+static void systick_set_period_from_clock(SysTickState *s)
{
+ /*
+ * Set the ptimer period from whichever clock is selected.
+ * Must be called from within a ptimer transaction block.
+ */
if (s->control & SYSTICK_CLKSOURCE) {
- return system_clock_scale;
+ ptimer_set_period_from_clock(s->ptimer, s->cpuclk, 1);
} else {
- return 1000;
+ ptimer_set_period_from_clock(s->ptimer, s->refclk, 1);
}
}
@@ -82,7 +86,28 @@ static MemTxResult systick_read(void *opaque, hwaddr addr, uint64_t *data,
val = ptimer_get_count(s->ptimer);
break;
case 0xc: /* SysTick Calibration Value. */
- val = 10000;
+ /*
+ * In real hardware it is possible to make this register report
+ * a different value from what the reference clock is actually
+ * running at. We don't model that (which usually happens due
+ * to integration errors in the real hardware) and instead always
+ * report the theoretical correct value as described in the
+ * knowledgebase article at
+ * https://developer.arm.com/documentation/ka001325/latest
+ * If necessary, we could implement an extra QOM property on this
+ * device to force the STCALIB value to something different from
+ * the "correct" value.
+ */
+ if (!clock_has_source(s->refclk)) {
+ val = SYSCALIB_NOREF;
+ break;
+ }
+ val = clock_ns_to_ticks(s->refclk, 10 * SCALE_MS) - 1;
+ val &= SYSCALIB_TENMS;
+ if (clock_ticks_to_ns(s->refclk, val + 1) != 10 * SCALE_MS) {
+ /* report that tick count does not yield exactly 10ms */
+ val |= SYSCALIB_SKEW;
+ }
break;
default:
val = 0;
@@ -114,6 +139,11 @@ static MemTxResult systick_write(void *opaque, hwaddr addr,
{
uint32_t oldval;
+ if (!clock_has_source(s->refclk)) {
+ /* This bit is always 1 if there is no external refclk */
+ value |= SYSTICK_CLKSOURCE;
+ }
+
ptimer_transaction_begin(s->ptimer);
oldval = s->control;
s->control &= 0xfffffff8;
@@ -121,19 +151,14 @@ static MemTxResult systick_write(void *opaque, hwaddr addr,
if ((oldval ^ value) & SYSTICK_ENABLE) {
if (value & SYSTICK_ENABLE) {
- /*
- * Always reload the period in case board code has
- * changed system_clock_scale. If we ever replace that
- * global with a more sensible API then we might be able
- * to set the period only when it actually changes.
- */
- ptimer_set_period(s->ptimer, systick_scale(s));
ptimer_run(s->ptimer, 0);
} else {
ptimer_stop(s->ptimer);
}
- } else if ((oldval ^ value) & SYSTICK_CLKSOURCE) {
- ptimer_set_period(s->ptimer, systick_scale(s));
+ }
+
+ if ((oldval ^ value) & SYSTICK_CLKSOURCE) {
+ systick_set_period_from_clock(s);
}
ptimer_transaction_commit(s->ptimer);
break;
@@ -176,20 +201,42 @@ static void systick_reset(DeviceState *dev)
{
SysTickState *s = SYSTICK(dev);
- /*
- * Forgetting to set system_clock_scale is always a board code
- * bug. We can't check this earlier because for some boards
- * (like stellaris) it is not yet configured at the point where
- * the systick device is realized.
- */
- assert(system_clock_scale != 0);
-
ptimer_transaction_begin(s->ptimer);
s->control = 0;
+ if (!clock_has_source(s->refclk)) {
+ /* This bit is always 1 if there is no external refclk */
+ s->control |= SYSTICK_CLKSOURCE;
+ }
ptimer_stop(s->ptimer);
ptimer_set_count(s->ptimer, 0);
ptimer_set_limit(s->ptimer, 0, 0);
- ptimer_set_period(s->ptimer, systick_scale(s));
+ systick_set_period_from_clock(s);
+ ptimer_transaction_commit(s->ptimer);
+}
+
+static void systick_cpuclk_update(void *opaque, ClockEvent event)
+{
+ SysTickState *s = SYSTICK(opaque);
+
+ if (!(s->control & SYSTICK_CLKSOURCE)) {
+ /* currently using refclk, we can ignore cpuclk changes */
+ }
+
+ ptimer_transaction_begin(s->ptimer);
+ ptimer_set_period_from_clock(s->ptimer, s->cpuclk, 1);
+ ptimer_transaction_commit(s->ptimer);
+}
+
+static void systick_refclk_update(void *opaque, ClockEvent event)
+{
+ SysTickState *s = SYSTICK(opaque);
+
+ if (s->control & SYSTICK_CLKSOURCE) {
+ /* currently using cpuclk, we can ignore refclk changes */
+ }
+
+ ptimer_transaction_begin(s->ptimer);
+ ptimer_set_period_from_clock(s->ptimer, s->refclk, 1);
ptimer_transaction_commit(s->ptimer);
}
@@ -201,6 +248,11 @@ static void systick_instance_init(Object *obj)
memory_region_init_io(&s->iomem, obj, &systick_ops, s, "systick", 0xe0);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->irq);
+
+ s->refclk = qdev_init_clock_in(DEVICE(obj), "refclk",
+ systick_refclk_update, s, ClockUpdate);
+ s->cpuclk = qdev_init_clock_in(DEVICE(obj), "cpuclk",
+ systick_cpuclk_update, s, ClockUpdate);
}
static void systick_realize(DeviceState *dev, Error **errp)
@@ -211,13 +263,21 @@ static void systick_realize(DeviceState *dev, Error **errp)
PTIMER_POLICY_NO_COUNTER_ROUND_DOWN |
PTIMER_POLICY_NO_IMMEDIATE_RELOAD |
PTIMER_POLICY_TRIGGER_ONLY_ON_DECREMENT);
+
+ if (!clock_has_source(s->cpuclk)) {
+ error_setg(errp, "systick: cpuclk must be connected");
+ return;
+ }
+ /* It's OK not to connect the refclk */
}
static const VMStateDescription vmstate_systick = {
.name = "armv7m_systick",
- .version_id = 2,
- .minimum_version_id = 2,
+ .version_id = 3,
+ .minimum_version_id = 3,
.fields = (VMStateField[]) {
+ VMSTATE_CLOCK(refclk, SysTickState),
+ VMSTATE_CLOCK(cpuclk, SysTickState),
VMSTATE_UINT32(control, SysTickState),
VMSTATE_INT64(tick, SysTickState),
VMSTATE_PTIMER(ptimer, SysTickState),
diff --git a/hw/timer/meson.build b/hw/timer/meson.build
index 1aa3cd2284..e67478a8f1 100644
--- a/hw/timer/meson.build
+++ b/hw/timer/meson.build
@@ -31,6 +31,7 @@ softmmu_ss.add(when: 'CONFIG_SH_TIMER', if_true: files('sh_timer.c'))
softmmu_ss.add(when: 'CONFIG_SLAVIO', if_true: files('slavio_timer.c'))
softmmu_ss.add(when: 'CONFIG_SSE_COUNTER', if_true: files('sse-counter.c'))
softmmu_ss.add(when: 'CONFIG_SSE_TIMER', if_true: files('sse-timer.c'))
+softmmu_ss.add(when: 'CONFIG_STELLARIS_GPTM', if_true: files('stellaris-gptm.c'))
softmmu_ss.add(when: 'CONFIG_STM32F2XX_TIMER', if_true: files('stm32f2xx_timer.c'))
softmmu_ss.add(when: 'CONFIG_XILINX', if_true: files('xilinx_timer.c'))
specific_ss.add(when: 'CONFIG_IBEX', if_true: files('ibex_timer.c'))
diff --git a/hw/timer/stellaris-gptm.c b/hw/timer/stellaris-gptm.c
new file mode 100644
index 0000000000..fd71c79be4
--- /dev/null
+++ b/hw/timer/stellaris-gptm.c
@@ -0,0 +1,332 @@
+/*
+ * Luminary Micro Stellaris General Purpose Timer Module
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the GPL.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+#include "qapi/error.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-clock.h"
+#include "hw/timer/stellaris-gptm.h"
+
+static void gptm_update_irq(gptm_state *s)
+{
+ int level;
+ level = (s->state & s->mask) != 0;
+ qemu_set_irq(s->irq, level);
+}
+
+static void gptm_stop(gptm_state *s, int n)
+{
+ timer_del(s->timer[n]);
+}
+
+static void gptm_reload(gptm_state *s, int n, int reset)
+{
+ int64_t tick;
+ if (reset) {
+ tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ } else {
+ tick = s->tick[n];
+ }
+
+ if (s->config == 0) {
+ /* 32-bit CountDown. */
+ uint32_t count;
+ count = s->load[0] | (s->load[1] << 16);
+ tick += clock_ticks_to_ns(s->clk, count);
+ } else if (s->config == 1) {
+ /* 32-bit RTC. 1Hz tick. */
+ tick += NANOSECONDS_PER_SECOND;
+ } else if (s->mode[n] == 0xa) {
+ /* PWM mode. Not implemented. */
+ } else {
+ qemu_log_mask(LOG_UNIMP,
+ "GPTM: 16-bit timer mode unimplemented: 0x%x\n",
+ s->mode[n]);
+ return;
+ }
+ s->tick[n] = tick;
+ timer_mod(s->timer[n], tick);
+}
+
+static void gptm_tick(void *opaque)
+{
+ gptm_state **p = (gptm_state **)opaque;
+ gptm_state *s;
+ int n;
+
+ s = *p;
+ n = p - s->opaque;
+ if (s->config == 0) {
+ s->state |= 1;
+ if ((s->control & 0x20)) {
+ /* Output trigger. */
+ qemu_irq_pulse(s->trigger);
+ }
+ if (s->mode[0] & 1) {
+ /* One-shot. */
+ s->control &= ~1;
+ } else {
+ /* Periodic. */
+ gptm_reload(s, 0, 0);
+ }
+ } else if (s->config == 1) {
+ /* RTC. */
+ uint32_t match;
+ s->rtc++;
+ match = s->match[0] | (s->match[1] << 16);
+ if (s->rtc > match)
+ s->rtc = 0;
+ if (s->rtc == 0) {
+ s->state |= 8;
+ }
+ gptm_reload(s, 0, 0);
+ } else if (s->mode[n] == 0xa) {
+ /* PWM mode. Not implemented. */
+ } else {
+ qemu_log_mask(LOG_UNIMP,
+ "GPTM: 16-bit timer mode unimplemented: 0x%x\n",
+ s->mode[n]);
+ }
+ gptm_update_irq(s);
+}
+
+static uint64_t gptm_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ gptm_state *s = (gptm_state *)opaque;
+
+ switch (offset) {
+ case 0x00: /* CFG */
+ return s->config;
+ case 0x04: /* TAMR */
+ return s->mode[0];
+ case 0x08: /* TBMR */
+ return s->mode[1];
+ case 0x0c: /* CTL */
+ return s->control;
+ case 0x18: /* IMR */
+ return s->mask;
+ case 0x1c: /* RIS */
+ return s->state;
+ case 0x20: /* MIS */
+ return s->state & s->mask;
+ case 0x24: /* CR */
+ return 0;
+ case 0x28: /* TAILR */
+ return s->load[0] | ((s->config < 4) ? (s->load[1] << 16) : 0);
+ case 0x2c: /* TBILR */
+ return s->load[1];
+ case 0x30: /* TAMARCHR */
+ return s->match[0] | ((s->config < 4) ? (s->match[1] << 16) : 0);
+ case 0x34: /* TBMATCHR */
+ return s->match[1];
+ case 0x38: /* TAPR */
+ return s->prescale[0];
+ case 0x3c: /* TBPR */
+ return s->prescale[1];
+ case 0x40: /* TAPMR */
+ return s->match_prescale[0];
+ case 0x44: /* TBPMR */
+ return s->match_prescale[1];
+ case 0x48: /* TAR */
+ if (s->config == 1) {
+ return s->rtc;
+ }
+ qemu_log_mask(LOG_UNIMP,
+ "GPTM: read of TAR but timer read not supported\n");
+ return 0;
+ case 0x4c: /* TBR */
+ qemu_log_mask(LOG_UNIMP,
+ "GPTM: read of TBR but timer read not supported\n");
+ return 0;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "GPTM: read at bad offset 0x02%" HWADDR_PRIx "\n",
+ offset);
+ return 0;
+ }
+}
+
+static void gptm_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
+{
+ gptm_state *s = (gptm_state *)opaque;
+ uint32_t oldval;
+
+ /*
+ * The timers should be disabled before changing the configuration.
+ * We take advantage of this and defer everything until the timer
+ * is enabled.
+ */
+ switch (offset) {
+ case 0x00: /* CFG */
+ s->config = value;
+ break;
+ case 0x04: /* TAMR */
+ s->mode[0] = value;
+ break;
+ case 0x08: /* TBMR */
+ s->mode[1] = value;
+ break;
+ case 0x0c: /* CTL */
+ oldval = s->control;
+ s->control = value;
+ /* TODO: Implement pause. */
+ if ((oldval ^ value) & 1) {
+ if (value & 1) {
+ gptm_reload(s, 0, 1);
+ } else {
+ gptm_stop(s, 0);
+ }
+ }
+ if (((oldval ^ value) & 0x100) && s->config >= 4) {
+ if (value & 0x100) {
+ gptm_reload(s, 1, 1);
+ } else {
+ gptm_stop(s, 1);
+ }
+ }
+ break;
+ case 0x18: /* IMR */
+ s->mask = value & 0x77;
+ gptm_update_irq(s);
+ break;
+ case 0x24: /* CR */
+ s->state &= ~value;
+ break;
+ case 0x28: /* TAILR */
+ s->load[0] = value & 0xffff;
+ if (s->config < 4) {
+ s->load[1] = value >> 16;
+ }
+ break;
+ case 0x2c: /* TBILR */
+ s->load[1] = value & 0xffff;
+ break;
+ case 0x30: /* TAMARCHR */
+ s->match[0] = value & 0xffff;
+ if (s->config < 4) {
+ s->match[1] = value >> 16;
+ }
+ break;
+ case 0x34: /* TBMATCHR */
+ s->match[1] = value >> 16;
+ break;
+ case 0x38: /* TAPR */
+ s->prescale[0] = value;
+ break;
+ case 0x3c: /* TBPR */
+ s->prescale[1] = value;
+ break;
+ case 0x40: /* TAPMR */
+ s->match_prescale[0] = value;
+ break;
+ case 0x44: /* TBPMR */
+ s->match_prescale[0] = value;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "GPTM: write at bad offset 0x02%" HWADDR_PRIx "\n",
+ offset);
+ }
+ gptm_update_irq(s);
+}
+
+static const MemoryRegionOps gptm_ops = {
+ .read = gptm_read,
+ .write = gptm_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_stellaris_gptm = {
+ .name = "stellaris_gptm",
+ .version_id = 2,
+ .minimum_version_id = 2,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(config, gptm_state),
+ VMSTATE_UINT32_ARRAY(mode, gptm_state, 2),
+ VMSTATE_UINT32(control, gptm_state),
+ VMSTATE_UINT32(state, gptm_state),
+ VMSTATE_UINT32(mask, gptm_state),
+ VMSTATE_UNUSED(8),
+ VMSTATE_UINT32_ARRAY(load, gptm_state, 2),
+ VMSTATE_UINT32_ARRAY(match, gptm_state, 2),
+ VMSTATE_UINT32_ARRAY(prescale, gptm_state, 2),
+ VMSTATE_UINT32_ARRAY(match_prescale, gptm_state, 2),
+ VMSTATE_UINT32(rtc, gptm_state),
+ VMSTATE_INT64_ARRAY(tick, gptm_state, 2),
+ VMSTATE_TIMER_PTR_ARRAY(timer, gptm_state, 2),
+ VMSTATE_CLOCK(clk, gptm_state),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void stellaris_gptm_init(Object *obj)
+{
+ DeviceState *dev = DEVICE(obj);
+ gptm_state *s = STELLARIS_GPTM(obj);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+ sysbus_init_irq(sbd, &s->irq);
+ qdev_init_gpio_out(dev, &s->trigger, 1);
+
+ memory_region_init_io(&s->iomem, obj, &gptm_ops, s,
+ "gptm", 0x1000);
+ sysbus_init_mmio(sbd, &s->iomem);
+
+ s->opaque[0] = s->opaque[1] = s;
+
+ /*
+ * TODO: in an ideal world we would model the effects of changing
+ * the input clock frequency while the countdown timer is active.
+ * The best way to do this would be to convert the device to use
+ * ptimer instead of hand-rolling its own timer. This would also
+ * make it easy to implement reading the current count from the
+ * TAR and TBR registers.
+ */
+ s->clk = qdev_init_clock_in(dev, "clk", NULL, NULL, 0);
+}
+
+static void stellaris_gptm_realize(DeviceState *dev, Error **errp)
+{
+ gptm_state *s = STELLARIS_GPTM(dev);
+
+ if (!clock_has_source(s->clk)) {
+ error_setg(errp, "stellaris-gptm: clk must be connected");
+ return;
+ }
+
+ s->timer[0] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[0]);
+ s->timer[1] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[1]);
+}
+
+static void stellaris_gptm_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->vmsd = &vmstate_stellaris_gptm;
+ dc->realize = stellaris_gptm_realize;
+}
+
+static const TypeInfo stellaris_gptm_info = {
+ .name = TYPE_STELLARIS_GPTM,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(gptm_state),
+ .instance_init = stellaris_gptm_init,
+ .class_init = stellaris_gptm_class_init,
+};
+
+static void stellaris_gptm_register_types(void)
+{
+ type_register_static(&stellaris_gptm_info);
+}
+
+type_init(stellaris_gptm_register_types)
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2025-04-25 14:17:54 +0200