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qemu/hw/timer/pxa2xx_timer.c
Abhiram Tilak efabbc07e9 misc: pxa2xx_timer: replace qemu_system_reset_request() call with watchdog_perform_action() 
A few watchdog devices use qemu_system_reset_request(). This is not ideal since
behaviour of watchdog-expiry can't be changed by QMP using `watchdog_action`.
As stated in BiteSizedTasks wiki page, instead of using qemu_system_reset_request()
to reset when a watchdog timer expires, let watchdog_perform_action() decide
what to do.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2124
Signed-off-by: Abhiram Tilak <atp.exp@gmail.com>
Message-id: 20240216192612.30838-5-atp.exp@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2024-02-27 13:01:41 +00:00

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/*
* Intel XScale PXA255/270 OS Timers.
*
* Copyright (c) 2006 Openedhand Ltd.
* Copyright (c) 2006 Thorsten Zitterell
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "qemu/timer.h"
#include "sysemu/runstate.h"
#include "hw/arm/pxa.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qom/object.h"
#include "sysemu/watchdog.h"
#define OSMR0 0x00
#define OSMR1 0x04
#define OSMR2 0x08
#define OSMR3 0x0c
#define OSMR4 0x80
#define OSMR5 0x84
#define OSMR6 0x88
#define OSMR7 0x8c
#define OSMR8 0x90
#define OSMR9 0x94
#define OSMR10 0x98
#define OSMR11 0x9c
#define OSCR 0x10 /* OS Timer Count */
#define OSCR4 0x40
#define OSCR5 0x44
#define OSCR6 0x48
#define OSCR7 0x4c
#define OSCR8 0x50
#define OSCR9 0x54
#define OSCR10 0x58
#define OSCR11 0x5c
#define OSSR 0x14 /* Timer status register */
#define OWER 0x18
#define OIER 0x1c /* Interrupt enable register 3-0 to E3-E0 */
#define OMCR4 0xc0 /* OS Match Control registers */
#define OMCR5 0xc4
#define OMCR6 0xc8
#define OMCR7 0xcc
#define OMCR8 0xd0
#define OMCR9 0xd4
#define OMCR10 0xd8
#define OMCR11 0xdc
#define OSNR 0x20
#define PXA25X_FREQ 3686400 /* 3.6864 MHz */
#define PXA27X_FREQ 3250000 /* 3.25 MHz */
static int pxa2xx_timer4_freq[8] = {
[0] = 0,
[1] = 32768,
[2] = 1000,
[3] = 1,
[4] = 1000000,
/* [5] is the "Externally supplied clock". Assign if necessary. */
[5 ... 7] = 0,
};
#define TYPE_PXA2XX_TIMER "pxa2xx-timer"
OBJECT_DECLARE_SIMPLE_TYPE(PXA2xxTimerInfo, PXA2XX_TIMER)
typedef struct {
uint32_t value;
qemu_irq irq;
QEMUTimer *qtimer;
int num;
PXA2xxTimerInfo *info;
} PXA2xxTimer0;
typedef struct {
PXA2xxTimer0 tm;
int32_t oldclock;
int32_t clock;
uint64_t lastload;
uint32_t freq;
uint32_t control;
} PXA2xxTimer4;
struct PXA2xxTimerInfo {
SysBusDevice parent_obj;
MemoryRegion iomem;
uint32_t flags;
int32_t clock;
int32_t oldclock;
uint64_t lastload;
uint32_t freq;
PXA2xxTimer0 timer[4];
uint32_t events;
uint32_t irq_enabled;
uint32_t reset3;
uint32_t snapshot;
qemu_irq irq4;
PXA2xxTimer4 tm4[8];
};
#define PXA2XX_TIMER_HAVE_TM4 0
static inline int pxa2xx_timer_has_tm4(PXA2xxTimerInfo *s)
{
return s->flags & (1 << PXA2XX_TIMER_HAVE_TM4);
}
static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)
{
PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
int i;
uint32_t now_vm;
uint64_t new_qemu;
now_vm = s->clock +
muldiv64(now_qemu - s->lastload, s->freq, NANOSECONDS_PER_SECOND);
for (i = 0; i < 4; i ++) {
new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),
NANOSECONDS_PER_SECOND, s->freq);
timer_mod(s->timer[i].qtimer, new_qemu);
}
}
static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)
{
PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
uint32_t now_vm;
uint64_t new_qemu;
static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };
int counter;
assert(n < ARRAY_SIZE(counters));
if (s->tm4[n].control & (1 << 7))
counter = n;
else
counter = counters[n];
if (!s->tm4[counter].freq) {
timer_del(s->tm4[n].tm.qtimer);
return;
}
now_vm = s->tm4[counter].clock + muldiv64(now_qemu -
s->tm4[counter].lastload,
s->tm4[counter].freq, NANOSECONDS_PER_SECOND);
new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
NANOSECONDS_PER_SECOND, s->tm4[counter].freq);
timer_mod(s->tm4[n].tm.qtimer, new_qemu);
}
static uint64_t pxa2xx_timer_read(void *opaque, hwaddr offset,
unsigned size)
{
PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
int tm = 0;
switch (offset) {
case OSMR3: tm ++;
/* fall through */
case OSMR2: tm ++;
/* fall through */
case OSMR1: tm ++;
/* fall through */
case OSMR0:
return s->timer[tm].value;
case OSMR11: tm ++;
/* fall through */
case OSMR10: tm ++;
/* fall through */
case OSMR9: tm ++;
/* fall through */
case OSMR8: tm ++;
/* fall through */
case OSMR7: tm ++;
/* fall through */
case OSMR6: tm ++;
/* fall through */
case OSMR5: tm ++;
/* fall through */
case OSMR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
return s->tm4[tm].tm.value;
case OSCR:
return s->clock + muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
s->lastload, s->freq, NANOSECONDS_PER_SECOND);
case OSCR11: tm ++;
/* fall through */
case OSCR10: tm ++;
/* fall through */
case OSCR9: tm ++;
/* fall through */
case OSCR8: tm ++;
/* fall through */
case OSCR7: tm ++;
/* fall through */
case OSCR6: tm ++;
/* fall through */
case OSCR5: tm ++;
/* fall through */
case OSCR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {
if (s->tm4[tm - 1].freq)
s->snapshot = s->tm4[tm - 1].clock + muldiv64(
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
s->tm4[tm - 1].lastload,
s->tm4[tm - 1].freq, NANOSECONDS_PER_SECOND);
else
s->snapshot = s->tm4[tm - 1].clock;
}
if (!s->tm4[tm].freq)
return s->tm4[tm].clock;
return s->tm4[tm].clock +
muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
s->tm4[tm].lastload, s->tm4[tm].freq,
NANOSECONDS_PER_SECOND);
case OIER:
return s->irq_enabled;
case OSSR: /* Status register */
return s->events;
case OWER:
return s->reset3;
case OMCR11: tm ++;
/* fall through */
case OMCR10: tm ++;
/* fall through */
case OMCR9: tm ++;
/* fall through */
case OMCR8: tm ++;
/* fall through */
case OMCR7: tm ++;
/* fall through */
case OMCR6: tm ++;
/* fall through */
case OMCR5: tm ++;
/* fall through */
case OMCR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
return s->tm4[tm].control;
case OSNR:
return s->snapshot;
default:
qemu_log_mask(LOG_UNIMP,
"%s: unknown register 0x%02" HWADDR_PRIx "\n",
__func__, offset);
break;
badreg:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: incorrect register 0x%02" HWADDR_PRIx "\n",
__func__, offset);
}
return 0;
}
static void pxa2xx_timer_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
int i, tm = 0;
PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
switch (offset) {
case OSMR3: tm ++;
/* fall through */
case OSMR2: tm ++;
/* fall through */
case OSMR1: tm ++;
/* fall through */
case OSMR0:
s->timer[tm].value = value;
pxa2xx_timer_update(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
break;
case OSMR11: tm ++;
/* fall through */
case OSMR10: tm ++;
/* fall through */
case OSMR9: tm ++;
/* fall through */
case OSMR8: tm ++;
/* fall through */
case OSMR7: tm ++;
/* fall through */
case OSMR6: tm ++;
/* fall through */
case OSMR5: tm ++;
/* fall through */
case OSMR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
s->tm4[tm].tm.value = value;
pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm);
break;
case OSCR:
s->oldclock = s->clock;
s->lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
s->clock = value;
pxa2xx_timer_update(s, s->lastload);
break;
case OSCR11: tm ++;
/* fall through */
case OSCR10: tm ++;
/* fall through */
case OSCR9: tm ++;
/* fall through */
case OSCR8: tm ++;
/* fall through */
case OSCR7: tm ++;
/* fall through */
case OSCR6: tm ++;
/* fall through */
case OSCR5: tm ++;
/* fall through */
case OSCR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
s->tm4[tm].oldclock = s->tm4[tm].clock;
s->tm4[tm].lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
s->tm4[tm].clock = value;
pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
break;
case OIER:
s->irq_enabled = value & 0xfff;
break;
case OSSR: /* Status register */
value &= s->events;
s->events &= ~value;
for (i = 0; i < 4; i ++, value >>= 1)
if (value & 1)
qemu_irq_lower(s->timer[i].irq);
if (pxa2xx_timer_has_tm4(s) && !(s->events & 0xff0) && value)
qemu_irq_lower(s->irq4);
break;
case OWER: /* XXX: Reset on OSMR3 match? */
s->reset3 = value;
break;
case OMCR7: tm ++;
/* fall through */
case OMCR6: tm ++;
/* fall through */
case OMCR5: tm ++;
/* fall through */
case OMCR4:
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
s->tm4[tm].control = value & 0x0ff;
/* XXX Stop if running (shouldn't happen) */
if ((value & (1 << 7)) || tm == 0)
s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
else {
s->tm4[tm].freq = 0;
pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm);
}
break;
case OMCR11: tm ++;
/* fall through */
case OMCR10: tm ++;
/* fall through */
case OMCR9: tm ++;
/* fall through */
case OMCR8: tm += 4;
if (!pxa2xx_timer_has_tm4(s))
goto badreg;
s->tm4[tm].control = value & 0x3ff;
/* XXX Stop if running (shouldn't happen) */
if ((value & (1 << 7)) || !(tm & 1))
s->tm4[tm].freq =
pxa2xx_timer4_freq[(value & (1 << 8)) ? 0 : (value & 7)];
else {
s->tm4[tm].freq = 0;
pxa2xx_timer_update4(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), tm);
}
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: unknown register 0x%02" HWADDR_PRIx " "
"(value 0x%08" PRIx64 ")\n", __func__, offset, value);
break;
badreg:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: incorrect register 0x%02" HWADDR_PRIx " "
"(value 0x%08" PRIx64 ")\n", __func__, offset, value);
}
}
static const MemoryRegionOps pxa2xx_timer_ops = {
.read = pxa2xx_timer_read,
.write = pxa2xx_timer_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void pxa2xx_timer_tick(void *opaque)
{
PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque;
PXA2xxTimerInfo *i = t->info;
if (i->irq_enabled & (1 << t->num)) {
i->events |= 1 << t->num;
qemu_irq_raise(t->irq);
}
if (t->num == 3)
if (i->reset3 & 1) {
i->reset3 = 0;
watchdog_perform_action();
}
}
static void pxa2xx_timer_tick4(void *opaque)
{
PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque;
PXA2xxTimerInfo *i = (PXA2xxTimerInfo *) t->tm.info;
pxa2xx_timer_tick(&t->tm);
if (t->control & (1 << 3))
t->clock = 0;
if (t->control & (1 << 6))
pxa2xx_timer_update4(i, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), t->tm.num - 4);
if (i->events & 0xff0)
qemu_irq_raise(i->irq4);
}
static int pxa25x_timer_post_load(void *opaque, int version_id)
{
PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;
int64_t now;
int i;
now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
pxa2xx_timer_update(s, now);
if (pxa2xx_timer_has_tm4(s))
for (i = 0; i < 8; i ++)
pxa2xx_timer_update4(s, now, i);
return 0;
}
static void pxa2xx_timer_init(Object *obj)
{
PXA2xxTimerInfo *s = PXA2XX_TIMER(obj);
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
s->irq_enabled = 0;
s->oldclock = 0;
s->clock = 0;
s->lastload = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
s->reset3 = 0;
memory_region_init_io(&s->iomem, obj, &pxa2xx_timer_ops, s,
"pxa2xx-timer", 0x00001000);
sysbus_init_mmio(dev, &s->iomem);
}
static void pxa2xx_timer_realize(DeviceState *dev, Error **errp)
{
PXA2xxTimerInfo *s = PXA2XX_TIMER(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
int i;
for (i = 0; i < 4; i ++) {
s->timer[i].value = 0;
sysbus_init_irq(sbd, &s->timer[i].irq);
s->timer[i].info = s;
s->timer[i].num = i;
s->timer[i].qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
pxa2xx_timer_tick, &s->timer[i]);
}
if (s->flags & (1 << PXA2XX_TIMER_HAVE_TM4)) {
sysbus_init_irq(sbd, &s->irq4);
for (i = 0; i < 8; i ++) {
s->tm4[i].tm.value = 0;
s->tm4[i].tm.info = s;
s->tm4[i].tm.num = i + 4;
s->tm4[i].freq = 0;
s->tm4[i].control = 0x0;
s->tm4[i].tm.qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
pxa2xx_timer_tick4, &s->tm4[i]);
}
}
}
static const VMStateDescription vmstate_pxa2xx_timer0_regs = {
.name = "pxa2xx_timer0",
.version_id = 2,
.minimum_version_id = 2,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(value, PXA2xxTimer0),
VMSTATE_END_OF_LIST(),
},
};
static const VMStateDescription vmstate_pxa2xx_timer4_regs = {
.name = "pxa2xx_timer4",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_STRUCT(tm, PXA2xxTimer4, 1,
vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),
VMSTATE_INT32(oldclock, PXA2xxTimer4),
VMSTATE_INT32(clock, PXA2xxTimer4),
VMSTATE_UINT64(lastload, PXA2xxTimer4),
VMSTATE_UINT32(freq, PXA2xxTimer4),
VMSTATE_UINT32(control, PXA2xxTimer4),
VMSTATE_END_OF_LIST(),
},
};
static bool pxa2xx_timer_has_tm4_test(void *opaque, int version_id)
{
return pxa2xx_timer_has_tm4(opaque);
}
static const VMStateDescription vmstate_pxa2xx_timer_regs = {
.name = "pxa2xx_timer",
.version_id = 1,
.minimum_version_id = 1,
.post_load = pxa25x_timer_post_load,
.fields = (const VMStateField[]) {
VMSTATE_INT32(clock, PXA2xxTimerInfo),
VMSTATE_INT32(oldclock, PXA2xxTimerInfo),
VMSTATE_UINT64(lastload, PXA2xxTimerInfo),
VMSTATE_STRUCT_ARRAY(timer, PXA2xxTimerInfo, 4, 1,
vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),
VMSTATE_UINT32(events, PXA2xxTimerInfo),
VMSTATE_UINT32(irq_enabled, PXA2xxTimerInfo),
VMSTATE_UINT32(reset3, PXA2xxTimerInfo),
VMSTATE_UINT32(snapshot, PXA2xxTimerInfo),
VMSTATE_STRUCT_ARRAY_TEST(tm4, PXA2xxTimerInfo, 8,
pxa2xx_timer_has_tm4_test, 0,
vmstate_pxa2xx_timer4_regs, PXA2xxTimer4),
VMSTATE_END_OF_LIST(),
}
};
static Property pxa25x_timer_dev_properties[] = {
DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA25X_FREQ),
DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,
PXA2XX_TIMER_HAVE_TM4, false),
DEFINE_PROP_END_OF_LIST(),
};
static void pxa25x_timer_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "PXA25x timer";
device_class_set_props(dc, pxa25x_timer_dev_properties);
}
static const TypeInfo pxa25x_timer_dev_info = {
.name = "pxa25x-timer",
.parent = TYPE_PXA2XX_TIMER,
.instance_size = sizeof(PXA2xxTimerInfo),
.class_init = pxa25x_timer_dev_class_init,
};
static Property pxa27x_timer_dev_properties[] = {
DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA27X_FREQ),
DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,
PXA2XX_TIMER_HAVE_TM4, true),
DEFINE_PROP_END_OF_LIST(),
};
static void pxa27x_timer_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "PXA27x timer";
device_class_set_props(dc, pxa27x_timer_dev_properties);
}
static const TypeInfo pxa27x_timer_dev_info = {
.name = "pxa27x-timer",
.parent = TYPE_PXA2XX_TIMER,
.instance_size = sizeof(PXA2xxTimerInfo),
.class_init = pxa27x_timer_dev_class_init,
};
static void pxa2xx_timer_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = pxa2xx_timer_realize;
dc->vmsd = &vmstate_pxa2xx_timer_regs;
}
static const TypeInfo pxa2xx_timer_type_info = {
.name = TYPE_PXA2XX_TIMER,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(PXA2xxTimerInfo),
.instance_init = pxa2xx_timer_init,
.abstract = true,
.class_init = pxa2xx_timer_class_init,
};
static void pxa2xx_timer_register_types(void)
{
type_register_static(&pxa2xx_timer_type_info);
type_register_static(&pxa25x_timer_dev_info);
type_register_static(&pxa27x_timer_dev_info);
}
type_init(pxa2xx_timer_register_types)
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