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 "migration/vmstate.h"
  28 #include "qemu/module.h"
  29 #include "trace.h"
  30 #include "qom/object.h"
  31
  32 /*
  33  * In addition to Crystal CS4231 there is a DMA controller on Sparc.
  34  */
  35 #define CS_SIZE 0x40
  36 #define CS_REGS 16
  37 #define CS_DREGS 32
  38 #define CS_MAXDREG (CS_DREGS - 1)
  39
  40 #define TYPE_CS4231 "sun-CS4231"
  41 typedef struct CSState CSState;
  42 DECLARE_INSTANCE_CHECKER(CSState, CS4231,
  43                          TYPE_CS4231)
  44
  45 struct CSState {
  46     SysBusDevice parent_obj;
  47
  48     MemoryRegion iomem;
  49     qemu_irq irq;
  50     uint32_t regs[CS_REGS];
  51     uint8_t dregs[CS_DREGS];
  52 };
  53
  54 #define CS_RAP(s) ((s)->regs[0] & CS_MAXDREG)
  55 #define CS_VER 0xa0
  56 #define CS_CDC_VER 0x8a
  57
  58 static void cs_reset(DeviceState *d)
  59 {
  60     CSState *s = CS4231(d);
  61
  62     memset(s->regs, 0, CS_REGS * 4);
  63     memset(s->dregs, 0, CS_DREGS);
  64     s->dregs[12] = CS_CDC_VER;
  65     s->dregs[25] = CS_VER;
  66 }
  67
  68 static uint64_t cs_mem_read(void *opaque, hwaddr addr,
  69                             unsigned size)
  70 {
  71     CSState *s = opaque;
  72     uint32_t saddr, ret;
  73
  74     saddr = addr >> 2;
  75     switch (saddr) {
  76     case 1:
  77         switch (CS_RAP(s)) {
  78         case 3: // Write only
  79             ret = 0;
  80             break;
  81         default:
  82             ret = s->dregs[CS_RAP(s)];
  83             break;
  84         }
  85         trace_cs4231_mem_readl_dreg(CS_RAP(s), ret);
  86         break;
  87     default:
  88         ret = s->regs[saddr];
  89         trace_cs4231_mem_readl_reg(saddr, ret);
  90         break;
  91     }
  92     return ret;
  93 }
  94
  95 static void cs_mem_write(void *opaque, hwaddr addr,
  96                          uint64_t val, unsigned size)
  97 {
  98     CSState *s = opaque;
  99     uint32_t saddr;
 100
 101     saddr = addr >> 2;
 102     trace_cs4231_mem_writel_reg(saddr, s->regs[saddr], val);
 103     switch (saddr) {
 104     case 1:
 105         trace_cs4231_mem_writel_dreg(CS_RAP(s), s->dregs[CS_RAP(s)], val);
 106         switch(CS_RAP(s)) {
 107         case 11:
 108         case 25: // Read only
 109             break;
 110         case 12:
 111             val &= 0x40;
 112             val |= CS_CDC_VER; // Codec version
 113             s->dregs[CS_RAP(s)] = val;
 114             break;
 115         default:
 116             s->dregs[CS_RAP(s)] = val;
 117             break;
 118         }
 119         break;
 120     case 2: // Read only
 121         break;
 122     case 4:
 123         if (val & 1) {
 124             cs_reset(DEVICE(s));
 125         }
 126         val &= 0x7f;
 127         s->regs[saddr] = val;
 128         break;
 129     default:
 130         s->regs[saddr] = val;
 131         break;
 132     }
 133 }
 134
 135 static const MemoryRegionOps cs_mem_ops = {
 136     .read = cs_mem_read,
 137     .write = cs_mem_write,
 138     .endianness = DEVICE_NATIVE_ENDIAN,
 139 };
 140
 141 static const VMStateDescription vmstate_cs4231 = {
 142     .name ="cs4231",
 143     .version_id = 1,
 144     .minimum_version_id = 1,
 145     .fields = (VMStateField[]) {
 146         VMSTATE_UINT32_ARRAY(regs, CSState, CS_REGS),
 147         VMSTATE_UINT8_ARRAY(dregs, CSState, CS_DREGS),
 148         VMSTATE_END_OF_LIST()
 149     }
 150 };
 151
 152 static void cs4231_init(Object *obj)
 153 {
 154     CSState *s = CS4231(obj);
 155     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 156
 157     memory_region_init_io(&s->iomem, obj, &cs_mem_ops, s, "cs4321",
 158                           CS_SIZE);
 159     sysbus_init_mmio(dev, &s->iomem);
 160     sysbus_init_irq(dev, &s->irq);
 161 }
 162
 163 static 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 }
 170
 171 static const TypeInfo cs4231_info = {
 172     .name          = TYPE_CS4231,
 173     .parent        = TYPE_SYS_BUS_DEVICE,
 174     .instance_size = sizeof(CSState),
 175     .instance_init = cs4231_init,
 176     .class_init    = cs4231_class_init,
 177 };
 178
 179 static void cs4231_register_types(void)
 180 {
 181     type_register_static(&cs4231_info);
 182 }
 183
 184 type_init(cs4231_register_types)