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hw/arm/armv7m: Create input clocks

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Create input clocks on the armv7m container object which pass through
to the systick timers, so that users of the armv7m object can specify
the clocks being used.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Message-id: 20210812093356.1946-7-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-08-12 10:33:37 +01:00
parent 5c6e1a1cf9
commit d5093d9615
2 changed files with 29 additions and 0 deletions
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23
hw/arm/armv7m.c
View File

@ -14,12 +14,14 @@
#include "hw/arm/boot.h"
#include "hw/loader.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-clock.h"
#include "elf.h"
#include "sysemu/reset.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/log.h"
#include "target/arm/idau.h"
#include "migration/vmstate.h"
/* Bitbanded IO. Each word corresponds to a single bit. */
@ -265,6 +267,9 @@ static void armv7m_instance_init(Object *obj)
object_initialize_child(obj, "bitband[*]", &s->bitband[i],
TYPE_BITBAND);
}
s->refclk = qdev_init_clock_in(DEVICE(obj), "refclk", NULL, NULL, 0);
s->cpuclk = qdev_init_clock_in(DEVICE(obj), "cpuclk", NULL, NULL, 0);
}
static void armv7m_realize(DeviceState *dev, Error **errp)
@ -416,6 +421,8 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
}
/* Create and map the systick devices */
qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "refclk", s->refclk);
qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "cpuclk", s->cpuclk);
if (!sysbus_realize(SYS_BUS_DEVICE(&s->systick[M_REG_NS]), errp)) {
return;
}
@ -431,6 +438,10 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
*/
object_initialize_child(OBJECT(dev), "systick-reg-s",
&s->systick[M_REG_S], TYPE_SYSTICK);
qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "refclk",
s->refclk);
qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "cpuclk",
s->cpuclk);
if (!sysbus_realize(SYS_BUS_DEVICE(&s->systick[M_REG_S]), errp)) {
return;
@ -504,11 +515,23 @@ static Property armv7m_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_armv7m = {
.name = "armv7m",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_CLOCK(refclk, SysTickState),
VMSTATE_CLOCK(cpuclk, SysTickState),
VMSTATE_END_OF_LIST()
}
};
static void armv7m_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = armv7m_realize;
dc->vmsd = &vmstate_armv7m;
device_class_set_props(dc, armv7m_properties);
}

6
include/hw/arm/armv7m.h
View File

@ -15,6 +15,7 @@
#include "hw/misc/armv7m_ras.h"
#include "target/arm/idau.h"
#include "qom/object.h"
#include "hw/clock.h"
#define TYPE_BITBAND "ARM-bitband-memory"
OBJECT_DECLARE_SIMPLE_TYPE(BitBandState, BITBAND)
@ -51,6 +52,8 @@ OBJECT_DECLARE_SIMPLE_TYPE(ARMv7MState, ARMV7M)
* + Property "vfp": enable VFP (forwarded to CPU object)
* + Property "dsp": enable DSP (forwarded to CPU object)
* + Property "enable-bitband": expose bitbanded IO
* + Clock input "refclk" is the external reference clock for the systick timers
* + Clock input "cpuclk" is the main CPU clock
*/
struct ARMv7MState {
/*< private >*/
@ -82,6 +85,9 @@ struct ARMv7MState {
/* MR providing default PPB behaviour */
MemoryRegion defaultmem;
Clock *refclk;
Clock *cpuclk;
/* Properties */
char *cpu_type;
/* MemoryRegion the board provides to us (with its devices, RAM, etc) */