aboutsummaryrefslogtreecommitdiff
path: root/hw/misc/a9scu.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/misc/a9scu.c')
-rw-r--r--hw/misc/a9scu.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/hw/misc/a9scu.c b/hw/misc/a9scu.c
new file mode 100644
index 0000000000..05897c2fa2
--- /dev/null
+++ b/hw/misc/a9scu.c
@@ -0,0 +1,164 @@
+/*
+ * 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, &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)