| 1 | /* |
| 2 | * ARM11MPCore Snoop Control Unit (SCU) emulation |
| 3 | * |
| 4 | * Copyright (c) 2006-2007 CodeSourcery. |
| 5 | * Copyright (c) 2013 SUSE LINUX Products GmbH |
| 6 | * Written by Paul Brook and Andreas Färber |
| 7 | * |
| 8 | * This code is licensed under the GPL. |
| 9 | */ |
| 10 | |
| 11 | #include "qemu/osdep.h" |
| 12 | #include "hw/misc/arm11scu.h" |
| 13 | #include "hw/core/qdev-properties.h" |
| 14 | #include "qemu/log.h" |
| 15 | #include "qemu/module.h" |
| 16 | |
| 17 | static uint64_t mpcore_scu_read(void *opaque, hwaddr offset, |
| 18 | unsigned size) |
| 19 | { |
| 20 | ARM11SCUState *s = (ARM11SCUState *)opaque; |
| 21 | int id; |
| 22 | /* SCU */ |
| 23 | switch (offset) { |
| 24 | case 0x00: /* Control. */ |
| 25 | return s->control; |
| 26 | case 0x04: /* Configuration. */ |
| 27 | id = ((1 << s->num_cpu) - 1) << 4; |
| 28 | return id | (s->num_cpu - 1); |
| 29 | case 0x08: /* CPU status. */ |
| 30 | return 0; |
| 31 | case 0x0c: /* Invalidate all. */ |
| 32 | return 0; |
| 33 | default: |
| 34 | qemu_log_mask(LOG_GUEST_ERROR, |
| 35 | "mpcore_priv_read: Bad offset %x\n", (int)offset); |
| 36 | return 0; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | static void mpcore_scu_write(void *opaque, hwaddr offset, |
| 41 | uint64_t value, unsigned size) |
| 42 | { |
| 43 | ARM11SCUState *s = (ARM11SCUState *)opaque; |
| 44 | /* SCU */ |
| 45 | switch (offset) { |
| 46 | case 0: /* Control register. */ |
| 47 | s->control = value & 1; |
| 48 | break; |
| 49 | case 0x0c: /* Invalidate all. */ |
| 50 | /* This is a no-op as cache is not emulated. */ |
| 51 | break; |
| 52 | default: |
| 53 | qemu_log_mask(LOG_GUEST_ERROR, |
| 54 | "mpcore_priv_read: Bad offset %x\n", (int)offset); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | static const MemoryRegionOps mpcore_scu_ops = { |
| 59 | .read = mpcore_scu_read, |
| 60 | .write = mpcore_scu_write, |
| 61 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 62 | }; |
| 63 | |
| 64 | static void arm11_scu_realize(DeviceState *dev, Error **errp) |
| 65 | { |
| 66 | } |
| 67 | |
| 68 | static void arm11_scu_init(Object *obj) |
| 69 | { |
| 70 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
| 71 | ARM11SCUState *s = ARM11_SCU(obj); |
| 72 | |
| 73 | memory_region_init_io(&s->iomem, OBJECT(s), |
| 74 | &mpcore_scu_ops, s, "mpcore-scu", 0x100); |
| 75 | sysbus_init_mmio(sbd, &s->iomem); |
| 76 | } |
| 77 | |
| 78 | static const Property arm11_scu_properties[] = { |
| 79 | DEFINE_PROP_UINT32("num-cpu", ARM11SCUState, num_cpu, 1), |
| 80 | }; |
| 81 | |
| 82 | static void arm11_scu_class_init(ObjectClass *oc, const void *data) |
| 83 | { |
| 84 | DeviceClass *dc = DEVICE_CLASS(oc); |
| 85 | |
| 86 | dc->realize = arm11_scu_realize; |
| 87 | device_class_set_props(dc, arm11_scu_properties); |
| 88 | } |
| 89 | |
| 90 | static const TypeInfo arm11_scu_type_info = { |
| 91 | .name = TYPE_ARM11_SCU, |
| 92 | .parent = TYPE_SYS_BUS_DEVICE, |
| 93 | .instance_size = sizeof(ARM11SCUState), |
| 94 | .instance_init = arm11_scu_init, |
| 95 | .class_init = arm11_scu_class_init, |
| 96 | }; |
| 97 | |
| 98 | static void arm11_scu_register_types(void) |
| 99 | { |
| 100 | type_register_static(&arm11_scu_type_info); |
| 101 | } |
| 102 | |
| 103 | type_init(arm11_scu_register_types) |