diff options
Diffstat (limited to 'hw/misc/a9scu.c')
-rw-r--r-- | hw/misc/a9scu.c | 164 |
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) |