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/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, 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) 104