LXR qemu/hw/audio/cs4231.c

   1/*
   2 * QEMU Crystal CS4231 audio chip emulation
   3 *
   4 * Copyright (c) 2006 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "hw/sysbus.h"
  27#include "trace.h"
  28
  29/*
  30 * In addition to Crystal CS4231 there is a DMA controller on Sparc.
  31 */
  32#define CS_SIZE 0x40
  33#define CS_REGS 16
  34#define CS_DREGS 32
  35#define CS_MAXDREG (CS_DREGS - 1)
  36
  37#define TYPE_CS4231 "SUNW,CS4231"
  38#define CS4231(obj) \
  39    OBJECT_CHECK(CSState, (obj), TYPE_CS4231)
  40
  41typedef struct CSState {
  42    SysBusDevice parent_obj;
  43
  44    MemoryRegion iomem;
  45    qemu_irq irq;
  46    uint32_t regs[CS_REGS];
  47    uint8_t dregs[CS_DREGS];
  48} CSState;
  49
  50#define CS_RAP(s) ((s)->regs[0] & CS_MAXDREG)
  51#define CS_VER 0xa0
  52#define CS_CDC_VER 0x8a
  53
  54static void cs_reset(DeviceState *d)
  55{
  56    CSState *s = CS4231(d);
  57
  58    memset(s->regs, 0, CS_REGS * 4);
  59    memset(s->dregs, 0, CS_DREGS);
  60    s->dregs[12] = CS_CDC_VER;
  61    s->dregs[25] = CS_VER;
  62}
  63
  64static uint64_t cs_mem_read(void *opaque, hwaddr addr,
  65                            unsigned size)
  66{
  67    CSState *s = opaque;
  68    uint32_t saddr, ret;
  69
  70    saddr = addr >> 2;
  71    switch (saddr) {
  72    case 1:
  73        switch (CS_RAP(s)) {
  74        case 3: // Write only
  75            ret = 0;
  76            break;
  77        default:
  78            ret = s->dregs[CS_RAP(s)];
  79            break;
  80        }
  81        trace_cs4231_mem_readl_dreg(CS_RAP(s), ret);
  82        break;
  83    default:
  84        ret = s->regs[saddr];
  85        trace_cs4231_mem_readl_reg(saddr, ret);
  86        break;
  87    }
  88    return ret;
  89}
  90
  91static void cs_mem_write(void *opaque, hwaddr addr,
  92                         uint64_t val, unsigned size)
  93{
  94    CSState *s = opaque;
  95    uint32_t saddr;
  96
  97    saddr = addr >> 2;
  98    trace_cs4231_mem_writel_reg(saddr, s->regs[saddr], val);
  99    switch (saddr) {
 100    case 1:
 101        trace_cs4231_mem_writel_dreg(CS_RAP(s), s->dregs[CS_RAP(s)], val);
 102        switch(CS_RAP(s)) {
 103        case 11:
 104        case 25: // Read only
 105            break;
 106        case 12:
 107            val &= 0x40;
 108            val |= CS_CDC_VER; // Codec version
 109            s->dregs[CS_RAP(s)] = val;
 110            break;
 111        default:
 112            s->dregs[CS_RAP(s)] = val;
 113            break;
 114        }
 115        break;
 116    case 2: // Read only
 117        break;
 118    case 4:
 119        if (val & 1) {
 120            cs_reset(DEVICE(s));
 121        }
 122        val &= 0x7f;
 123        s->regs[saddr] = val;
 124        break;
 125    default:
 126        s->regs[saddr] = val;
 127        break;
 128    }
 129}
 130
 131static const MemoryRegionOps cs_mem_ops = {
 132    .read = cs_mem_read,
 133    .write = cs_mem_write,
 134    .endianness = DEVICE_NATIVE_ENDIAN,
 135};
 136
 137static const VMStateDescription vmstate_cs4231 = {
 138    .name ="cs4231",
 139    .version_id = 1,
 140    .minimum_version_id = 1,
 141    .fields = (VMStateField[]) {
 142        VMSTATE_UINT32_ARRAY(regs, CSState, CS_REGS),
 143        VMSTATE_UINT8_ARRAY(dregs, CSState, CS_DREGS),
 144        VMSTATE_END_OF_LIST()
 145    }
 146};
 147
 148static void cs4231_init(Object *obj)
 149{
 150    CSState *s = CS4231(obj);
 151    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 152
 153    memory_region_init_io(&s->iomem, obj, &cs_mem_ops, s, "cs4321",
 154                          CS_SIZE);
 155    sysbus_init_mmio(dev, &s->iomem);
 156    sysbus_init_irq(dev, &s->irq);
 157}
 158
 159static Property cs4231_properties[] = {
 160    {.name = NULL},
 161};
 162
 163static void cs4231_class_init(ObjectClass *klass, void *data)
 164{
 165    DeviceClass *dc = DEVICE_CLASS(klass);
 166
 167    dc->reset = cs_reset;
 168    dc->vmsd = &vmstate_cs4231;
 169    dc->props = cs4231_properties;
 170}
 171
 172static const TypeInfo cs4231_info = {
 173    .name          = TYPE_CS4231,
 174    .parent        = TYPE_SYS_BUS_DEVICE,
 175    .instance_size = sizeof(CSState),
 176    .instance_init = cs4231_init,
 177    .class_init    = cs4231_class_init,
 178};
 179
 180static void cs4231_register_types(void)
 181{
 182    type_register_static(&cs4231_info);
 183}
 184
 185type_init(cs4231_register_types)
 186