hw/marvell_88w8618_audio.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 licenced under the GNU GPL v2.
   8  */
   9 #include "sysbus.h"
  10 #include "hw.h"
  11 #include "i2c.h"
  12 #include "sysbus.h"
  13 #include "audio/audio.h"
  14
  15 #define MP_AUDIO_SIZE           0x00001000
  16
  17 /* Audio register offsets */
  18 #define MP_AUDIO_PLAYBACK_MODE  0x00
  19 #define MP_AUDIO_CLOCK_DIV      0x18
  20 #define MP_AUDIO_IRQ_STATUS     0x20
  21 #define MP_AUDIO_IRQ_ENABLE     0x24
  22 #define MP_AUDIO_TX_START_LO    0x28
  23 #define MP_AUDIO_TX_THRESHOLD   0x2C
  24 #define MP_AUDIO_TX_STATUS      0x38
  25 #define MP_AUDIO_TX_START_HI    0x40
  26
  27 /* Status register and IRQ enable bits */
  28 #define MP_AUDIO_TX_HALF        (1 << 6)
  29 #define MP_AUDIO_TX_FULL        (1 << 7)
  30
  31 /* Playback mode bits */
  32 #define MP_AUDIO_16BIT_SAMPLE   (1 << 0)
  33 #define MP_AUDIO_PLAYBACK_EN    (1 << 7)
  34 #define MP_AUDIO_CLOCK_24MHZ    (1 << 9)
  35 #define MP_AUDIO_MONO           (1 << 14)
  36
  37 #ifdef HAS_AUDIO
  38 typedef struct mv88w8618_audio_state {
  39     SysBusDevice busdev;
  40     qemu_irq irq;
  41     uint32_t playback_mode;
  42     uint32_t status;
  43     uint32_t irq_enable;
  44     uint32_t phys_buf;
  45     uint32_t target_buffer;
  46     uint32_t threshold;
  47     uint32_t play_pos;
  48     uint32_t last_free;
  49     uint32_t clock_div;
  50     DeviceState *wm;
  51 } mv88w8618_audio_state;
  52
  53 static void mv88w8618_audio_callback(void *opaque, int free_out, int free_in)
  54 {
  55     mv88w8618_audio_state *s = opaque;
  56     int16_t *codec_buffer;
  57     int8_t buf[4096];
  58     int8_t *mem_buffer;
  59     int pos, block_size;
  60
  61     if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
  62         return;
  63     }
  64     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
  65         free_out <<= 1;
  66     }
  67     if (!(s->playback_mode & MP_AUDIO_MONO)) {
  68         free_out <<= 1;
  69     }
  70     block_size = s->threshold / 2;
  71     if (free_out - s->last_free < block_size) {
  72         return;
  73     }
  74     if (block_size > 4096) {
  75         return;
  76     }
  77     cpu_physical_memory_read(s->target_buffer + s->play_pos, (void *)buf,
  78                              block_size);
  79     mem_buffer = buf;
  80     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
  81         if (s->playback_mode & MP_AUDIO_MONO) {
  82             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
  83             for (pos = 0; pos < block_size; pos += 2) {
  84                 *codec_buffer++ = *(int16_t *)mem_buffer;
  85                 *codec_buffer++ = *(int16_t *)mem_buffer;
  86                 mem_buffer += 2;
  87             }
  88         } else {
  89             memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
  90                    (uint32_t *)mem_buffer, block_size);
  91         }
  92     } else {
  93         if (s->playback_mode & MP_AUDIO_MONO) {
  94             codec_buffer = wm8750_dac_buffer(s->wm, block_size);
  95             for (pos = 0; pos < block_size; pos++) {
  96                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer);
  97                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
  98             }
  99         } else {
 100             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
 101             for (pos = 0; pos < block_size; pos += 2) {
 102                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 103                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 104             }
 105         }
 106     }
 107     wm8750_dac_commit(s->wm);
 108
 109     s->last_free = free_out - block_size;
 110
 111     if (s->play_pos == 0) {
 112         s->status |= MP_AUDIO_TX_HALF;
 113         s->play_pos = block_size;
 114     } else {
 115         s->status |= MP_AUDIO_TX_FULL;
 116         s->play_pos = 0;
 117     }
 118
 119     if (s->status & s->irq_enable) {
 120         qemu_irq_raise(s->irq);
 121     }
 122 }
 123
 124 static void mv88w8618_audio_clock_update(mv88w8618_audio_state *s)
 125 {
 126     int rate;
 127
 128     if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ) {
 129         rate = 24576000 / 64; /* 24.576MHz */
 130     } else {
 131         rate = 11289600 / 64; /* 11.2896MHz */
 132     }
 133     rate /= ((s->clock_div >> 8) & 0xff) + 1;
 134
 135     wm8750_set_bclk_in(s->wm, rate);
 136 }
 137
 138 static uint32_t mv88w8618_audio_read(void *opaque, target_phys_addr_t offset)
 139 {
 140     mv88w8618_audio_state *s = opaque;
 141
 142     switch (offset) {
 143     case MP_AUDIO_PLAYBACK_MODE:
 144         return s->playback_mode;
 145
 146     case MP_AUDIO_CLOCK_DIV:
 147         return s->clock_div;
 148
 149     case MP_AUDIO_IRQ_STATUS:
 150         return s->status;
 151
 152     case MP_AUDIO_IRQ_ENABLE:
 153         return s->irq_enable;
 154
 155     case MP_AUDIO_TX_STATUS:
 156         return s->play_pos >> 2;
 157
 158     default:
 159         return 0;
 160     }
 161 }
 162
 163 static void mv88w8618_audio_write(void *opaque, target_phys_addr_t offset,
 164                                  uint32_t value)
 165 {
 166     mv88w8618_audio_state *s = opaque;
 167
 168     switch (offset) {
 169     case MP_AUDIO_PLAYBACK_MODE:
 170         if (value & MP_AUDIO_PLAYBACK_EN &&
 171             !(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
 172             s->status = 0;
 173             s->last_free = 0;
 174             s->play_pos = 0;
 175         }
 176         s->playback_mode = value;
 177         mv88w8618_audio_clock_update(s);
 178         break;
 179
 180     case MP_AUDIO_CLOCK_DIV:
 181         s->clock_div = value;
 182         s->last_free = 0;
 183         s->play_pos = 0;
 184         mv88w8618_audio_clock_update(s);
 185         break;
 186
 187     case MP_AUDIO_IRQ_STATUS:
 188         s->status &= ~value;
 189         break;
 190
 191     case MP_AUDIO_IRQ_ENABLE:
 192         s->irq_enable = value;
 193         if (s->status & s->irq_enable) {
 194             qemu_irq_raise(s->irq);
 195         }
 196         break;
 197
 198     case MP_AUDIO_TX_START_LO:
 199         s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);
 200         s->target_buffer = s->phys_buf;
 201         s->play_pos = 0;
 202         s->last_free = 0;
 203         break;
 204
 205     case MP_AUDIO_TX_THRESHOLD:
 206         s->threshold = (value + 1) * 4;
 207         break;
 208
 209     case MP_AUDIO_TX_START_HI:
 210         s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);
 211         s->target_buffer = s->phys_buf;
 212         s->play_pos = 0;
 213         s->last_free = 0;
 214         break;
 215     }
 216 }
 217
 218 static void mv88w8618_audio_reset(DeviceState *d)
 219 {
 220     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state,
 221                                            sysbus_from_qdev(d));
 222
 223     s->playback_mode = 0;
 224     s->status = 0;
 225     s->irq_enable = 0;
 226     s->clock_div = 0;
 227     s->threshold = 0;
 228     s->phys_buf = 0;
 229 }
 230
 231 static CPUReadMemoryFunc * const mv88w8618_audio_readfn[] = {
 232     mv88w8618_audio_read,
 233     mv88w8618_audio_read,
 234     mv88w8618_audio_read
 235 };
 236
 237 static CPUWriteMemoryFunc * const mv88w8618_audio_writefn[] = {
 238     mv88w8618_audio_write,
 239     mv88w8618_audio_write,
 240     mv88w8618_audio_write
 241 };
 242
 243 static int mv88w8618_audio_init(SysBusDevice *dev)
 244 {
 245     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
 246     int iomemtype;
 247
 248     sysbus_init_irq(dev, &s->irq);
 249
 250     wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);
 251
 252     iomemtype = cpu_register_io_memory(mv88w8618_audio_readfn,
 253                                        mv88w8618_audio_writefn, s);
 254     sysbus_init_mmio(dev, MP_AUDIO_SIZE, iomemtype);
 255
 256     return 0;
 257 }
 258
 259 static const VMStateDescription mv88w8618_audio_vmsd = {
 260     .name = "mv88w8618_audio",
 261     .version_id = 1,
 262     .minimum_version_id = 1,
 263     .minimum_version_id_old = 1,
 264     .fields = (VMStateField[]) {
 265         VMSTATE_UINT32(playback_mode, mv88w8618_audio_state),
 266         VMSTATE_UINT32(status, mv88w8618_audio_state),
 267         VMSTATE_UINT32(irq_enable, mv88w8618_audio_state),
 268         VMSTATE_UINT32(phys_buf, mv88w8618_audio_state),
 269         VMSTATE_UINT32(target_buffer, mv88w8618_audio_state),
 270         VMSTATE_UINT32(threshold, mv88w8618_audio_state),
 271         VMSTATE_UINT32(play_pos, mv88w8618_audio_state),
 272         VMSTATE_UINT32(last_free, mv88w8618_audio_state),
 273         VMSTATE_UINT32(clock_div, mv88w8618_audio_state),
 274         VMSTATE_END_OF_LIST()
 275     }
 276 };
 277
 278 static SysBusDeviceInfo mv88w8618_audio_info = {
 279     .init = mv88w8618_audio_init,
 280     .qdev.name  = "mv88w8618_audio",
 281     .qdev.size  = sizeof(mv88w8618_audio_state),
 282     .qdev.reset = mv88w8618_audio_reset,
 283     .qdev.vmsd  = &mv88w8618_audio_vmsd,
 284     .qdev.props = (Property[]) {
 285         {
 286             .name   = "wm8750",
 287             .info   = &qdev_prop_ptr,
 288             .offset = offsetof(mv88w8618_audio_state, wm),
 289         },
 290         {/* end of list */}
 291     }
 292 };
 293 #endif
 294
 295 static void mv88w8618_register_devices(void)
 296 {
 297 #ifdef HAS_AUDIO
 298     sysbus_register_withprop(&mv88w8618_audio_info);
 299 #endif
 300 }
 301
 302 device_init(mv88w8618_register_devices)