2 * ARM11MPCore Snoop Control Unit (SCU) emulation
4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Copyright (c) 2013 SUSE LINUX Products GmbH
6 * Written by Paul Brook and Andreas Färber
8 * This code is licensed under the GPL.
11 #include "qemu/osdep.h"
12 #include "hw/misc/arm11scu.h"
14 static uint64_t mpcore_scu_read(void *opaque
, hwaddr offset
,
17 ARM11SCUState
*s
= (ARM11SCUState
*)opaque
;
21 case 0x00: /* Control. */
23 case 0x04: /* Configuration. */
24 id
= ((1 << s
->num_cpu
) - 1) << 4;
25 return id
| (s
->num_cpu
- 1);
26 case 0x08: /* CPU status. */
28 case 0x0c: /* Invalidate all. */
31 qemu_log_mask(LOG_GUEST_ERROR
,
32 "mpcore_priv_read: Bad offset %x\n", (int)offset
);
37 static void mpcore_scu_write(void *opaque
, hwaddr offset
,
38 uint64_t value
, unsigned size
)
40 ARM11SCUState
*s
= (ARM11SCUState
*)opaque
;
43 case 0: /* Control register. */
44 s
->control
= value
& 1;
46 case 0x0c: /* Invalidate all. */
47 /* This is a no-op as cache is not emulated. */
50 qemu_log_mask(LOG_GUEST_ERROR
,
51 "mpcore_priv_read: Bad offset %x\n", (int)offset
);
55 static const MemoryRegionOps mpcore_scu_ops
= {
56 .read
= mpcore_scu_read
,
57 .write
= mpcore_scu_write
,
58 .endianness
= DEVICE_NATIVE_ENDIAN
,
61 static void arm11_scu_realize(DeviceState
*dev
, Error
**errp
)
65 static void arm11_scu_init(Object
*obj
)
67 SysBusDevice
*sbd
= SYS_BUS_DEVICE(obj
);
68 ARM11SCUState
*s
= ARM11_SCU(obj
);
70 memory_region_init_io(&s
->iomem
, OBJECT(s
),
71 &mpcore_scu_ops
, s
, "mpcore-scu", 0x100);
72 sysbus_init_mmio(sbd
, &s
->iomem
);
75 static Property arm11_scu_properties
[] = {
76 DEFINE_PROP_UINT32("num-cpu", ARM11SCUState
, num_cpu
, 1),
77 DEFINE_PROP_END_OF_LIST()
80 static void arm11_scu_class_init(ObjectClass
*oc
, void *data
)
82 DeviceClass
*dc
= DEVICE_CLASS(oc
);
84 dc
->realize
= arm11_scu_realize
;
85 dc
->props
= arm11_scu_properties
;
88 static const TypeInfo arm11_scu_type_info
= {
89 .name
= TYPE_ARM11_SCU
,
90 .parent
= TYPE_SYS_BUS_DEVICE
,
91 .instance_size
= sizeof(ARM11SCUState
),
92 .instance_init
= arm11_scu_init
,
93 .class_init
= arm11_scu_class_init
,
96 static void arm11_scu_register_types(void)
98 type_register_static(&arm11_scu_type_info
);
101 type_init(arm11_scu_register_types
)