LXR qemu/hw/misc/arm

   1/*
   2 * ARM dummy L210, L220, PL310 cache controller.
   3 *
   4 * Copyright (c) 2010-2012 Calxeda
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2 or any later version, as published by the Free Software
   9 * Foundation.
  10 *
  11 * This program is distributed in the hope it will be useful, but WITHOUT
  12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14 * more details.
  15 *
  16 * You should have received a copy of the GNU General Public License along with
  17 * this program.  If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 */
  20
  21#include "hw/sysbus.h"
  22
  23/* L2C-310 r3p2 */
  24#define CACHE_ID 0x410000c8
  25
  26#define TYPE_ARM_L2X0 "l2x0"
  27#define ARM_L2X0(obj) OBJECT_CHECK(L2x0State, (obj), TYPE_ARM_L2X0)
  28
  29typedef struct L2x0State {
  30    SysBusDevice parent_obj;
  31
  32    MemoryRegion iomem;
  33    uint32_t cache_type;
  34    uint32_t ctrl;
  35    uint32_t aux_ctrl;
  36    uint32_t data_ctrl;
  37    uint32_t tag_ctrl;
  38    uint32_t filter_start;
  39    uint32_t filter_end;
  40} L2x0State;
  41
  42static const VMStateDescription vmstate_l2x0 = {
  43    .name = "l2x0",
  44    .version_id = 1,
  45    .minimum_version_id = 1,
  46    .fields = (VMStateField[]) {
  47        VMSTATE_UINT32(ctrl, L2x0State),
  48        VMSTATE_UINT32(aux_ctrl, L2x0State),
  49        VMSTATE_UINT32(data_ctrl, L2x0State),
  50        VMSTATE_UINT32(tag_ctrl, L2x0State),
  51        VMSTATE_UINT32(filter_start, L2x0State),
  52        VMSTATE_UINT32(filter_end, L2x0State),
  53        VMSTATE_END_OF_LIST()
  54    }
  55};
  56
  57
  58static uint64_t l2x0_priv_read(void *opaque, hwaddr offset,
  59                               unsigned size)
  60{
  61    uint32_t cache_data;
  62    L2x0State *s = (L2x0State *)opaque;
  63    offset &= 0xfff;
  64    if (offset >= 0x730 && offset < 0x800) {
  65        return 0; /* cache ops complete */
  66    }
  67    switch (offset) {
  68    case 0:
  69        return CACHE_ID;
  70    case 0x4:
  71        /* aux_ctrl values affect cache_type values */
  72        cache_data = (s->aux_ctrl & (7 << 17)) >> 15;
  73        cache_data |= (s->aux_ctrl & (1 << 16)) >> 16;
  74        return s->cache_type |= (cache_data << 18) | (cache_data << 6);
  75    case 0x100:
  76        return s->ctrl;
  77    case 0x104:
  78        return s->aux_ctrl;
  79    case 0x108:
  80        return s->tag_ctrl;
  81    case 0x10C:
  82        return s->data_ctrl;
  83    case 0xC00:
  84        return s->filter_start;
  85    case 0xC04:
  86        return s->filter_end;
  87    case 0xF40:
  88        return 0;
  89    case 0xF60:
  90        return 0;
  91    case 0xF80:
  92        return 0;
  93    default:
  94        qemu_log_mask(LOG_GUEST_ERROR,
  95                      "l2x0_priv_read: Bad offset %x\n", (int)offset);
  96        break;
  97    }
  98    return 0;
  99}
 100
 101static void l2x0_priv_write(void *opaque, hwaddr offset,
 102                            uint64_t value, unsigned size)
 103{
 104    L2x0State *s = (L2x0State *)opaque;
 105    offset &= 0xfff;
 106    if (offset >= 0x730 && offset < 0x800) {
 107        /* ignore */
 108        return;
 109    }
 110    switch (offset) {
 111    case 0x100:
 112        s->ctrl = value & 1;
 113        break;
 114    case 0x104:
 115        s->aux_ctrl = value;
 116        break;
 117    case 0x108:
 118        s->tag_ctrl = value;
 119        break;
 120    case 0x10C:
 121        s->data_ctrl = value;
 122        break;
 123    case 0xC00:
 124        s->filter_start = value;
 125        break;
 126    case 0xC04:
 127        s->filter_end = value;
 128        break;
 129    case 0xF40:
 130        return;
 131    case 0xF60:
 132        return;
 133    case 0xF80:
 134        return;
 135    default:
 136        qemu_log_mask(LOG_GUEST_ERROR,
 137                      "l2x0_priv_write: Bad offset %x\n", (int)offset);
 138        break;
 139    }
 140}
 141
 142static void l2x0_priv_reset(DeviceState *dev)
 143{
 144    L2x0State *s = ARM_L2X0(dev);
 145
 146    s->ctrl = 0;
 147    s->aux_ctrl = 0x02020000;
 148    s->tag_ctrl = 0;
 149    s->data_ctrl = 0;
 150    s->filter_start = 0;
 151    s->filter_end = 0;
 152}
 153
 154static const MemoryRegionOps l2x0_mem_ops = {
 155    .read = l2x0_priv_read,
 156    .write = l2x0_priv_write,
 157    .endianness = DEVICE_NATIVE_ENDIAN,
 158 };
 159
 160static int l2x0_priv_init(SysBusDevice *dev)
 161{
 162    L2x0State *s = ARM_L2X0(dev);
 163
 164    memory_region_init_io(&s->iomem, OBJECT(dev), &l2x0_mem_ops, s,
 165                          "l2x0_cc", 0x1000);
 166    sysbus_init_mmio(dev, &s->iomem);
 167    return 0;
 168}
 169
 170static Property l2x0_properties[] = {
 171    DEFINE_PROP_UINT32("cache-type", L2x0State, cache_type, 0x1c100100),
 172    DEFINE_PROP_END_OF_LIST(),
 173};
 174
 175static void l2x0_class_init(ObjectClass *klass, void *data)
 176{
 177    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 178    DeviceClass *dc = DEVICE_CLASS(klass);
 179
 180    k->init = l2x0_priv_init;
 181    dc->vmsd = &vmstate_l2x0;
 182    dc->no_user = 1;
 183    dc->props = l2x0_properties;
 184    dc->reset = l2x0_priv_reset;
 185}
 186
 187static const TypeInfo l2x0_info = {
 188    .name = TYPE_ARM_L2X0,
 189    .parent = TYPE_SYS_BUS_DEVICE,
 190    .instance_size = sizeof(L2x0State),
 191    .class_init = l2x0_class_init,
 192};
 193
 194static void l2x0_register_types(void)
 195{
 196    type_register_static(&l2x0_info);
 197}
 198
 199type_init(l2x0_register_types)
 200