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 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 "sysbus.h"
  13 #include "hw.h"
  14 #include "i2c.h"
  15 #include "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     DeviceState *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, (void *)buf,
  81                              block_size);
  82     mem_buffer = buf;
  83     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
  84         if (s->playback_mode & MP_AUDIO_MONO) {
  85             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
  86             for (pos = 0; pos < block_size; pos += 2) {
  87                 *codec_buffer++ = *(int16_t *)mem_buffer;
  88                 *codec_buffer++ = *(int16_t *)mem_buffer;
  89                 mem_buffer += 2;
  90             }
  91         } else {
  92             memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
  93                    (uint32_t *)mem_buffer, block_size);
  94         }
  95     } else {
  96         if (s->playback_mode & MP_AUDIO_MONO) {
  97             codec_buffer = wm8750_dac_buffer(s->wm, block_size);
  98             for (pos = 0; pos < block_size; pos++) {
  99                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer);
 100                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 101             }
 102         } else {
 103             codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
 104             for (pos = 0; pos < block_size; pos += 2) {
 105                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 106                 *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
 107             }
 108         }
 109     }
 110     wm8750_dac_commit(s->wm);
 111
 112     s->last_free = free_out - block_size;
 113
 114     if (s->play_pos == 0) {
 115         s->status |= MP_AUDIO_TX_HALF;
 116         s->play_pos = block_size;
 117     } else {
 118         s->status |= MP_AUDIO_TX_FULL;
 119         s->play_pos = 0;
 120     }
 121
 122     if (s->status & s->irq_enable) {
 123         qemu_irq_raise(s->irq);
 124     }
 125 }
 126
 127 static void mv88w8618_audio_clock_update(mv88w8618_audio_state *s)
 128 {
 129     int rate;
 130
 131     if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ) {
 132         rate = 24576000 / 64; /* 24.576MHz */
 133     } else {
 134         rate = 11289600 / 64; /* 11.2896MHz */
 135     }
 136     rate /= ((s->clock_div >> 8) & 0xff) + 1;
 137
 138     wm8750_set_bclk_in(s->wm, rate);
 139 }
 140
 141 static uint64_t mv88w8618_audio_read(void *opaque, target_phys_addr_t offset,
 142                                     unsigned size)
 143 {
 144     mv88w8618_audio_state *s = opaque;
 145
 146     switch (offset) {
 147     case MP_AUDIO_PLAYBACK_MODE:
 148         return s->playback_mode;
 149
 150     case MP_AUDIO_CLOCK_DIV:
 151         return s->clock_div;
 152
 153     case MP_AUDIO_IRQ_STATUS:
 154         return s->status;
 155
 156     case MP_AUDIO_IRQ_ENABLE:
 157         return s->irq_enable;
 158
 159     case MP_AUDIO_TX_STATUS:
 160         return s->play_pos >> 2;
 161
 162     default:
 163         return 0;
 164     }
 165 }
 166
 167 static void mv88w8618_audio_write(void *opaque, target_phys_addr_t offset,
 168                                   uint64_t value, unsigned size)
 169 {
 170     mv88w8618_audio_state *s = opaque;
 171
 172     switch (offset) {
 173     case MP_AUDIO_PLAYBACK_MODE:
 174         if (value & MP_AUDIO_PLAYBACK_EN &&
 175             !(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
 176             s->status = 0;
 177             s->last_free = 0;
 178             s->play_pos = 0;
 179         }
 180         s->playback_mode = value;
 181         mv88w8618_audio_clock_update(s);
 182         break;
 183
 184     case MP_AUDIO_CLOCK_DIV:
 185         s->clock_div = value;
 186         s->last_free = 0;
 187         s->play_pos = 0;
 188         mv88w8618_audio_clock_update(s);
 189         break;
 190
 191     case MP_AUDIO_IRQ_STATUS:
 192         s->status &= ~value;
 193         break;
 194
 195     case MP_AUDIO_IRQ_ENABLE:
 196         s->irq_enable = value;
 197         if (s->status & s->irq_enable) {
 198             qemu_irq_raise(s->irq);
 199         }
 200         break;
 201
 202     case MP_AUDIO_TX_START_LO:
 203         s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);
 204         s->target_buffer = s->phys_buf;
 205         s->play_pos = 0;
 206         s->last_free = 0;
 207         break;
 208
 209     case MP_AUDIO_TX_THRESHOLD:
 210         s->threshold = (value + 1) * 4;
 211         break;
 212
 213     case MP_AUDIO_TX_START_HI:
 214         s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);
 215         s->target_buffer = s->phys_buf;
 216         s->play_pos = 0;
 217         s->last_free = 0;
 218         break;
 219     }
 220 }
 221
 222 static void mv88w8618_audio_reset(DeviceState *d)
 223 {
 224     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state,
 225                                            sysbus_from_qdev(d));
 226
 227     s->playback_mode = 0;
 228     s->status = 0;
 229     s->irq_enable = 0;
 230     s->clock_div = 0;
 231     s->threshold = 0;
 232     s->phys_buf = 0;
 233 }
 234
 235 static const MemoryRegionOps mv88w8618_audio_ops = {
 236     .read = mv88w8618_audio_read,
 237     .write = mv88w8618_audio_write,
 238     .endianness = DEVICE_NATIVE_ENDIAN,
 239 };
 240
 241 static int mv88w8618_audio_init(SysBusDevice *dev)
 242 {
 243     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
 244
 245     sysbus_init_irq(dev, &s->irq);
 246
 247     wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);
 248
 249     memory_region_init_io(&s->iomem, &mv88w8618_audio_ops, s,
 250                           "audio", MP_AUDIO_SIZE);
 251     sysbus_init_mmio(dev, &s->iomem);
 252
 253     return 0;
 254 }
 255
 256 static const VMStateDescription mv88w8618_audio_vmsd = {
 257     .name = "mv88w8618_audio",
 258     .version_id = 1,
 259     .minimum_version_id = 1,
 260     .minimum_version_id_old = 1,
 261     .fields = (VMStateField[]) {
 262         VMSTATE_UINT32(playback_mode, mv88w8618_audio_state),
 263         VMSTATE_UINT32(status, mv88w8618_audio_state),
 264         VMSTATE_UINT32(irq_enable, mv88w8618_audio_state),
 265         VMSTATE_UINT32(phys_buf, mv88w8618_audio_state),
 266         VMSTATE_UINT32(target_buffer, mv88w8618_audio_state),
 267         VMSTATE_UINT32(threshold, mv88w8618_audio_state),
 268         VMSTATE_UINT32(play_pos, mv88w8618_audio_state),
 269         VMSTATE_UINT32(last_free, mv88w8618_audio_state),
 270         VMSTATE_UINT32(clock_div, mv88w8618_audio_state),
 271         VMSTATE_END_OF_LIST()
 272     }
 273 };
 274
 275 static SysBusDeviceInfo mv88w8618_audio_info = {
 276     .init = mv88w8618_audio_init,
 277     .qdev.name  = "mv88w8618_audio",
 278     .qdev.size  = sizeof(mv88w8618_audio_state),
 279     .qdev.reset = mv88w8618_audio_reset,
 280     .qdev.vmsd  = &mv88w8618_audio_vmsd,
 281     .qdev.props = (Property[]) {
 282         {
 283             .name   = "wm8750",
 284             .info   = &qdev_prop_ptr,
 285             .offset = offsetof(mv88w8618_audio_state, wm),
 286         },
 287         {/* end of list */}
 288     }
 289 };
 290
 291 static void mv88w8618_register_devices(void)
 292 {
 293     sysbus_register_withprop(&mv88w8618_audio_info);
 294 }
 295
 296 device_init(mv88w8618_register_devices)