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/*
* Cortex-A9MPCore Snoop Control Unit (SCU) emulation.
*
* Copyright (c) 2009 CodeSourcery.
* Copyright (c) 2011 Linaro Limited.
* Written by Paul Brook, Peter Maydell.
*
* This code is licensed under the GPL.
*/
#include "hw/sysbus.h"
/* A9MP private memory region. */
typedef struct A9SCUState {
SysBusDevice busdev;
MemoryRegion iomem;
uint32_t control;
uint32_t status;
uint32_t num_cpu;
} A9SCUState;
#define TYPE_A9_SCU "a9-scu"
#define A9_SCU(obj) OBJECT_CHECK(A9SCUState, (obj), TYPE_A9_SCU)
static uint64_t a9_scu_read(void *opaque, hwaddr offset,
unsigned size)
{
A9SCUState *s = (A9SCUState *)opaque;
switch (offset) {
case 0x00: /* Control */
return s->control;
case 0x04: /* Configuration */
return (((1 << s->num_cpu) - 1) << 4) | (s->num_cpu - 1);
case 0x08: /* CPU Power Status */
return s->status;
case 0x09: /* CPU status. */
return s->status >> 8;
case 0x0a: /* CPU status. */
return s->status >> 16;
case 0x0b: /* CPU status. */
return s->status >> 24;
case 0x0c: /* Invalidate All Registers In Secure State */
return 0;
case 0x40: /* Filtering Start Address Register */
case 0x44: /* Filtering End Address Register */
/* RAZ/WI, like an implementation with only one AXI master */
return 0;
case 0x50: /* SCU Access Control Register */
case 0x54: /* SCU Non-secure Access Control Register */
/* unimplemented, fall through */
default:
return 0;
}
}
static void a9_scu_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
A9SCUState *s = (A9SCUState *)opaque;
uint32_t mask;
uint32_t shift;
switch (size) {
case 1:
mask = 0xff;
break;
case 2:
mask = 0xffff;
break;
case 4:
mask = 0xffffffff;
break;
default:
fprintf(stderr, "Invalid size %u in write to a9 scu register %x\n",
size, (unsigned)offset);
return;
}
switch (offset) {
case 0x00: /* Control */
s->control = value & 1;
break;
case 0x4: /* Configuration: RO */
break;
case 0x08: case 0x09: case 0x0A: case 0x0B: /* Power Control */
shift = (offset - 0x8) * 8;
s->status &= ~(mask << shift);
s->status |= ((value & mask) << shift);
break;
case 0x0c: /* Invalidate All Registers In Secure State */
/* no-op as we do not implement caches */
break;
case 0x40: /* Filtering Start Address Register */
case 0x44: /* Filtering End Address Register */
/* RAZ/WI, like an implementation with only one AXI master */
break;
case 0x50: /* SCU Access Control Register */
case 0x54: /* SCU Non-secure Access Control Register */
/* unimplemented, fall through */
default:
break;
}
}
static const MemoryRegionOps a9_scu_ops = {
.read = a9_scu_read,
.write = a9_scu_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void a9_scu_reset(DeviceState *dev)
{
A9SCUState *s = A9_SCU(dev);
s->control = 0;
}
static void a9_scu_realize(DeviceState *dev, Error ** errp)
{
A9SCUState *s = A9_SCU(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
memory_region_init_io(&s->iomem, NULL, &a9_scu_ops, s, "a9-scu", 0x100);
sysbus_init_mmio(sbd, &s->iomem);
}
static const VMStateDescription vmstate_a9_scu = {
.name = "a9-scu",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(control, A9SCUState),
VMSTATE_UINT32(status, A9SCUState),
VMSTATE_END_OF_LIST()
}
};
static Property a9_scu_properties[] = {
DEFINE_PROP_UINT32("num-cpu", A9SCUState, num_cpu, 1),
DEFINE_PROP_END_OF_LIST(),
};
static void a9_scu_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = a9_scu_realize;
dc->props = a9_scu_properties;
dc->vmsd = &vmstate_a9_scu;
dc->reset = a9_scu_reset;
}
static const TypeInfo a9_scu_info = {
.name = TYPE_A9_SCU,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(A9SCUState),
.class_init = a9_scu_class_init,
};
static void a9mp_register_types(void)
{
type_register_static(&a9_scu_info);
}
type_init(a9mp_register_types)
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