hw/misc/arm11scu.c

   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 Property arm11_scu_properties[] = {
  79     DEFINE_PROP_UINT32("num-cpu", ARM11SCUState, num_cpu, 1),
  80     DEFINE_PROP_END_OF_LIST()
  81 };
  82
  83 static void arm11_scu_class_init(ObjectClass *oc, void *data)
  84 {
  85     DeviceClass *dc = DEVICE_CLASS(oc);
  86
  87     dc->realize = arm11_scu_realize;
  88     device_class_set_props(dc, arm11_scu_properties);
  89 }
  90
  91 static const TypeInfo arm11_scu_type_info = {
  92     .name          = TYPE_ARM11_SCU,
  93     .parent        = TYPE_SYS_BUS_DEVICE,
  94     .instance_size = sizeof(ARM11SCUState),
  95     .instance_init = arm11_scu_init,
  96     .class_init    = arm11_scu_class_init,
  97 };
  98
  99 static void arm11_scu_register_types(void)
 100 {
 101     type_register_static(&arm11_scu_type_info);
 102 }
 103
 104 type_init(arm11_scu_register_types)