hw/misc/arm_l2x0.c

   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
  29 typedef 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
  42 static 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
  58 static 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
 101 static 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
 142 static 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
 154 static const MemoryRegionOps l2x0_mem_ops = {
 155     .read = l2x0_priv_read,
 156     .write = l2x0_priv_write,
 157     .endianness = DEVICE_NATIVE_ENDIAN,
 158  };
 159
 160 static 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
 170 static Property l2x0_properties[] = {
 171     DEFINE_PROP_UINT32("cache-type", L2x0State, cache_type, 0x1c100100),
 172     DEFINE_PROP_END_OF_LIST(),
 173 };
 174
 175 static 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->props = l2x0_properties;
 183     dc->reset = l2x0_priv_reset;
 184 }
 185
 186 static const TypeInfo l2x0_info = {
 187     .name = TYPE_ARM_L2X0,
 188     .parent = TYPE_SYS_BUS_DEVICE,
 189     .instance_size = sizeof(L2x0State),
 190     .class_init = l2x0_class_init,
 191 };
 192
 193 static void l2x0_register_types(void)
 194 {
 195     type_register_static(&l2x0_info);
 196 }
 197
 198 type_init(l2x0_register_types)