hw/audio/marvell_88w8618.c

   1 /*
   2  * Marvell 88w8618 audio emulation extracted from
   3  * Marvell MV88w8618 / Freecom MusicPal emulation.
   4  *
   5  * Copyright (c) 2008 Jan Kiszka
   6  *
   7  * This code is licensed under the GNU GPL v2.
   8  *
   9  * Contributions after 2012-01-13 are licensed under the terms of the
  10  * GNU GPL, version 2 or (at your option) any later version.
  11  */
  12 #include "hw/sysbus.h"
  13 #include "hw/hw.h"
  14 #include "hw/i2c/i2c.h"
  15 #include "hw/sysbus.h"
  16 #include "audio/audio.h"
  17
  18 #define MP_AUDIO_SIZE           0x00001000
  19
  20 /* Audio register offsets */
  21 #define MP_AUDIO_PLAYBACK_MODE  0x00
  22 #define MP_AUDIO_CLOCK_DIV      0x18
  23 #define MP_AUDIO_IRQ_STATUS     0x20
  24 #define MP_AUDIO_IRQ_ENABLE     0x24
  25 #define MP_AUDIO_TX_START_LO    0x28
  26 #define MP_AUDIO_TX_THRESHOLD   0x2C
  27 #define MP_AUDIO_TX_STATUS      0x38
  28 #define MP_AUDIO_TX_START_HI    0x40
  29
  30 /* Status register and IRQ enable bits */
  31 #define MP_AUDIO_TX_HALF        (1 << 6)
  32 #define MP_AUDIO_TX_FULL        (1 << 7)
  33
  34 /* Playback mode bits */
  35 #define MP_AUDIO_16BIT_SAMPLE   (1 << 0)
  36 #define MP_AUDIO_PLAYBACK_EN    (1 << 7)
  37 #define MP_AUDIO_CLOCK_24MHZ    (1 << 9)
  38 #define MP_AUDIO_MONO           (1 << 14)
  39
  40 typedef struct mv88w8618_audio_state {
  41     SysBusDevice busdev;
  42     MemoryRegion iomem;
  43     qemu_irq irq;
  44     uint32_t playback_mode;
  45     uint32_t status;
  46     uint32_t irq_enable;
  47     uint32_t phys_buf;
  48     uint32_t target_buffer;
  49     uint32_t threshold;
  50     uint32_t play_pos;
  51     uint32_t last_free;
  52     uint32_t clock_div;
  53     void *wm;
  54 } mv88w8618_audio_state;
  55
  56 static void mv88w8618_audio_callback(void *opaque, int free_out, int free_in)
  57 {
  58     mv88w8618_audio_state *s = opaque;
  59     int16_t *codec_buffer;
  60     int8_t buf[4096];
  61     int8_t *mem_buffer;
  62     int pos, block_size;
  63
  64     if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
  65         return;
  66     }
  67     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
  68         free_out <<= 1;
  69     }
  70     if (!(s->playback_mode & MP_AUDIO_MONO)) {
  71         free_out <<= 1;
  72     }
  73     block_size = s->threshold / 2;
  74     if (free_out - s->last_free < block_size) {
  75         return;
  76     }
  77     if (block_size > 4096) {
  78         return;
  79     }
  80     cpu_physical_memory_read(s->target_buffer + s->play_pos, buf, block_size);
  81     mem_buffer = buf;
  82     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
  83         if (s->playback_mode & MP_AUDIO_MONO) {
  84             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
  85             for (pos = 0; pos < block_size; pos += 2) {
  86                 *codec_buffer++ = *(int16_t *)mem_buffer;
  87                 *codec_buffer++ = *(int16_t *)mem_buffer;
  88                 mem_buffer += 2;
  89             }
  90         } else {
  91             memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
  92                    (uint32_t *)mem_buffer, block_size);
  93         }
  94     } else {
  95         if (s->playback_mode & MP_AUDIO_MONO) {
  96             codec_buffer = wm8750_dac_buffer(s->wm, block_size);
  97             for (pos = 0; pos < block_size; pos++) {
  98                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer);
  99                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 100             }
 101         } else {
 102             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
 103             for (pos = 0; pos < block_size; pos += 2) {
 104                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 105                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 106             }
 107         }
 108     }
 109     wm8750_dac_commit(s->wm);
 110
 111     s->last_free = free_out - block_size;
 112
 113     if (s->play_pos == 0) {
 114         s->status |= MP_AUDIO_TX_HALF;
 115         s->play_pos = block_size;
 116     } else {
 117         s->status |= MP_AUDIO_TX_FULL;
 118         s->play_pos = 0;
 119     }
 120
 121     if (s->status & s->irq_enable) {
 122         qemu_irq_raise(s->irq);
 123     }
 124 }
 125
 126 static void mv88w8618_audio_clock_update(mv88w8618_audio_state *s)
 127 {
 128     int rate;
 129
 130     if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ) {
 131         rate = 24576000 / 64; /* 24.576MHz */
 132     } else {
 133         rate = 11289600 / 64; /* 11.2896MHz */
 134     }
 135     rate /= ((s->clock_div >> 8) & 0xff) + 1;
 136
 137     wm8750_set_bclk_in(s->wm, rate);
 138 }
 139
 140 static uint64_t mv88w8618_audio_read(void *opaque, hwaddr offset,
 141                                     unsigned size)
 142 {
 143     mv88w8618_audio_state *s = opaque;
 144
 145     switch (offset) {
 146     case MP_AUDIO_PLAYBACK_MODE:
 147         return s->playback_mode;
 148
 149     case MP_AUDIO_CLOCK_DIV:
 150         return s->clock_div;
 151
 152     case MP_AUDIO_IRQ_STATUS:
 153         return s->status;
 154
 155     case MP_AUDIO_IRQ_ENABLE:
 156         return s->irq_enable;
 157
 158     case MP_AUDIO_TX_STATUS:
 159         return s->play_pos >> 2;
 160
 161     default:
 162         return 0;
 163     }
 164 }
 165
 166 static void mv88w8618_audio_write(void *opaque, hwaddr offset,
 167                                   uint64_t value, unsigned size)
 168 {
 169     mv88w8618_audio_state *s = opaque;
 170
 171     switch (offset) {
 172     case MP_AUDIO_PLAYBACK_MODE:
 173         if (value & MP_AUDIO_PLAYBACK_EN &&
 174             !(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
 175             s->status = 0;
 176             s->last_free = 0;
 177             s->play_pos = 0;
 178         }
 179         s->playback_mode = value;
 180         mv88w8618_audio_clock_update(s);
 181         break;
 182
 183     case MP_AUDIO_CLOCK_DIV:
 184         s->clock_div = value;
 185         s->last_free = 0;
 186         s->play_pos = 0;
 187         mv88w8618_audio_clock_update(s);
 188         break;
 189
 190     case MP_AUDIO_IRQ_STATUS:
 191         s->status &= ~value;
 192         break;
 193
 194     case MP_AUDIO_IRQ_ENABLE:
 195         s->irq_enable = value;
 196         if (s->status & s->irq_enable) {
 197             qemu_irq_raise(s->irq);
 198         }
 199         break;
 200
 201     case MP_AUDIO_TX_START_LO:
 202         s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);
 203         s->target_buffer = s->phys_buf;
 204         s->play_pos = 0;
 205         s->last_free = 0;
 206         break;
 207
 208     case MP_AUDIO_TX_THRESHOLD:
 209         s->threshold = (value + 1) * 4;
 210         break;
 211
 212     case MP_AUDIO_TX_START_HI:
 213         s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);
 214         s->target_buffer = s->phys_buf;
 215         s->play_pos = 0;
 216         s->last_free = 0;
 217         break;
 218     }
 219 }
 220
 221 static void mv88w8618_audio_reset(DeviceState *d)
 222 {
 223     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state,
 224                                            SYS_BUS_DEVICE(d));
 225
 226     s->playback_mode = 0;
 227     s->status = 0;
 228     s->irq_enable = 0;
 229     s->clock_div = 0;
 230     s->threshold = 0;
 231     s->phys_buf = 0;
 232 }
 233
 234 static const MemoryRegionOps mv88w8618_audio_ops = {
 235     .read = mv88w8618_audio_read,
 236     .write = mv88w8618_audio_write,
 237     .endianness = DEVICE_NATIVE_ENDIAN,
 238 };
 239
 240 static int mv88w8618_audio_init(SysBusDevice *dev)
 241 {
 242     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
 243
 244     sysbus_init_irq(dev, &s->irq);
 245
 246     wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);
 247
 248     memory_region_init_io(&s->iomem, &mv88w8618_audio_ops, s,
 249                           "audio", MP_AUDIO_SIZE);
 250     sysbus_init_mmio(dev, &s->iomem);
 251
 252     return 0;
 253 }
 254
 255 static const VMStateDescription mv88w8618_audio_vmsd = {
 256     .name = "mv88w8618_audio",
 257     .version_id = 1,
 258     .minimum_version_id = 1,
 259     .minimum_version_id_old = 1,
 260     .fields = (VMStateField[]) {
 261         VMSTATE_UINT32(playback_mode, mv88w8618_audio_state),
 262         VMSTATE_UINT32(status, mv88w8618_audio_state),
 263         VMSTATE_UINT32(irq_enable, mv88w8618_audio_state),
 264         VMSTATE_UINT32(phys_buf, mv88w8618_audio_state),
 265         VMSTATE_UINT32(target_buffer, mv88w8618_audio_state),
 266         VMSTATE_UINT32(threshold, mv88w8618_audio_state),
 267         VMSTATE_UINT32(play_pos, mv88w8618_audio_state),
 268         VMSTATE_UINT32(last_free, mv88w8618_audio_state),
 269         VMSTATE_UINT32(clock_div, mv88w8618_audio_state),
 270         VMSTATE_END_OF_LIST()
 271     }
 272 };
 273
 274 static Property mv88w8618_audio_properties[] = {
 275     DEFINE_PROP_PTR("wm8750", mv88w8618_audio_state, wm),
 276     {/* end of list */},
 277 };
 278
 279 static void mv88w8618_audio_class_init(ObjectClass *klass, void *data)
 280 {
 281     DeviceClass *dc = DEVICE_CLASS(klass);
 282     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 283
 284     k->init = mv88w8618_audio_init;
 285     dc->reset = mv88w8618_audio_reset;
 286     dc->vmsd = &mv88w8618_audio_vmsd;
 287     dc->props = mv88w8618_audio_properties;
 288 }
 289
 290 static const TypeInfo mv88w8618_audio_info = {
 291     .name          = "mv88w8618_audio",
 292     .parent        = TYPE_SYS_BUS_DEVICE,
 293     .instance_size = sizeof(mv88w8618_audio_state),
 294     .class_init    = mv88w8618_audio_class_init,
 295 };
 296
 297 static void mv88w8618_register_types(void)
 298 {
 299     type_register_static(&mv88w8618_audio_info);
 300 }
 301
 302 type_init(mv88w8618_register_types)