Archipelago » qemu

/*

 * Marvell 88w8618 audio emulation extracted from

 * Marvell MV88w8618 / Freecom MusicPal emulation.

 *

 * Copyright (c) 2008 Jan Kiszka

 *

 * This code is licenced under the GNU GPL v2.

 */

#include "sysbus.h"

#include "hw.h"

#include "i2c.h"

#include "sysbus.h"

#include "audio/audio.h"

#define MP_AUDIO_SIZE           0x00001000

/* Audio register offsets */

#define MP_AUDIO_PLAYBACK_MODE  0x00

#define MP_AUDIO_CLOCK_DIV      0x18

#define MP_AUDIO_IRQ_STATUS     0x20

#define MP_AUDIO_IRQ_ENABLE     0x24

#define MP_AUDIO_TX_START_LO    0x28

#define MP_AUDIO_TX_THRESHOLD   0x2C

#define MP_AUDIO_TX_STATUS      0x38

#define MP_AUDIO_TX_START_HI    0x40

/* Status register and IRQ enable bits */

#define MP_AUDIO_TX_HALF        (1 << 6)

#define MP_AUDIO_TX_FULL        (1 << 7)

/* Playback mode bits */

#define MP_AUDIO_16BIT_SAMPLE   (1 << 0)

#define MP_AUDIO_PLAYBACK_EN    (1 << 7)

#define MP_AUDIO_CLOCK_24MHZ    (1 << 9)

#define MP_AUDIO_MONO           (1 << 14)

#ifdef HAS_AUDIO

typedef struct mv88w8618_audio_state {

    SysBusDevice busdev;

    qemu_irq irq;

    uint32_t playback_mode;

    uint32_t status;

    uint32_t irq_enable;

    unsigned long phys_buf;

    uint32_t target_buffer;

    unsigned int threshold;

    unsigned int play_pos;

    unsigned int last_free;

    uint32_t clock_div;

    DeviceState *wm;

} mv88w8618_audio_state;

static void mv88w8618_audio_callback(void *opaque, int free_out, int free_in)

{

    mv88w8618_audio_state *s = opaque;

    int16_t *codec_buffer;

    int8_t buf[4096];

    int8_t *mem_buffer;

    int pos, block_size;

    if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN))

        return;

    if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)

        free_out <<= 1;

    if (!(s->playback_mode & MP_AUDIO_MONO))

        free_out <<= 1;

    block_size = s->threshold / 2;

    if (free_out - s->last_free < block_size)

        return;

    if (block_size > 4096)

        return;

    cpu_physical_memory_read(s->target_buffer + s->play_pos, (void *)buf,

                             block_size);

    mem_buffer = buf;

    if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {

        if (s->playback_mode & MP_AUDIO_MONO) {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);

            for (pos = 0; pos < block_size; pos += 2) {

                *codec_buffer++ = *(int16_t *)mem_buffer;

                *codec_buffer++ = *(int16_t *)mem_buffer;

                mem_buffer += 2;

            }

        } else

            memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),

                   (uint32_t *)mem_buffer, block_size);

    } else {

        if (s->playback_mode & MP_AUDIO_MONO) {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size);

            for (pos = 0; pos < block_size; pos++) {

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer);

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

            }

        } else {

            codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);

            for (pos = 0; pos < block_size; pos += 2) {

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

                *codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);

            }

        }

    }

    wm8750_dac_commit(s->wm);

    s->last_free = free_out - block_size;

    if (s->play_pos == 0) {

        s->status |= MP_AUDIO_TX_HALF;

        s->play_pos = block_size;

    } else {

        s->status |= MP_AUDIO_TX_FULL;

        s->play_pos = 0;

    }

    if (s->status & s->irq_enable)

        qemu_irq_raise(s->irq);

}

static void mv88w8618_audio_clock_update(mv88w8618_audio_state *s)

{

    int rate;

    if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ)

        rate = 24576000 / 64; /* 24.576MHz */

    else

        rate = 11289600 / 64; /* 11.2896MHz */

    rate /= ((s->clock_div >> 8) & 0xff) + 1;

    wm8750_set_bclk_in(s->wm, rate);

}

static uint32_t mv88w8618_audio_read(void *opaque, a_target_phys_addr offset)

{

    mv88w8618_audio_state *s = opaque;

    switch (offset) {

    case MP_AUDIO_PLAYBACK_MODE:

        return s->playback_mode;

    case MP_AUDIO_CLOCK_DIV:

        return s->clock_div;

    case MP_AUDIO_IRQ_STATUS:

        return s->status;

    case MP_AUDIO_IRQ_ENABLE:

        return s->irq_enable;

    case MP_AUDIO_TX_STATUS:

        return s->play_pos >> 2;

    default:

        return 0;

    }

}

static void mv88w8618_audio_write(void *opaque, a_target_phys_addr offset,

                                 uint32_t value)

{

    mv88w8618_audio_state *s = opaque;

    switch (offset) {

    case MP_AUDIO_PLAYBACK_MODE:

        if (value & MP_AUDIO_PLAYBACK_EN &&

            !(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {

            s->status = 0;

            s->last_free = 0;

            s->play_pos = 0;

        }

        s->playback_mode = value;

        mv88w8618_audio_clock_update(s);

        break;

    case MP_AUDIO_CLOCK_DIV:

        s->clock_div = value;

        s->last_free = 0;

        s->play_pos = 0;

        mv88w8618_audio_clock_update(s);

        break;

    case MP_AUDIO_IRQ_STATUS:

        s->status &= ~value;

        break;

    case MP_AUDIO_IRQ_ENABLE:

        s->irq_enable = value;

        if (s->status & s->irq_enable)

            qemu_irq_raise(s->irq);

        break;

    case MP_AUDIO_TX_START_LO:

        s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);

        s->target_buffer = s->phys_buf;

        s->play_pos = 0;

        s->last_free = 0;

        break;

    case MP_AUDIO_TX_THRESHOLD:

        s->threshold = (value + 1) * 4;

        break;

    case MP_AUDIO_TX_START_HI:

        s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);

        s->target_buffer = s->phys_buf;

        s->play_pos = 0;

        s->last_free = 0;

        break;

    }

}

static void mv88w8618_audio_reset(void *opaque)

{

    mv88w8618_audio_state *s = opaque;

    s->playback_mode = 0;

    s->status = 0;

    s->irq_enable = 0;

}

static CPUReadMemoryFunc * const mv88w8618_audio_readfn[] = {

    mv88w8618_audio_read,

    mv88w8618_audio_read,

    mv88w8618_audio_read

};

static CPUWriteMemoryFunc * const mv88w8618_audio_writefn[] = {

    mv88w8618_audio_write,

    mv88w8618_audio_write,

    mv88w8618_audio_write

};

static int mv88w8618_audio_init(SysBusDevice *dev)

{

    mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);

    int iomemtype;

    sysbus_init_irq(dev, &s->irq);

    wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);

    iomemtype = cpu_register_io_memory(mv88w8618_audio_readfn,

                                       mv88w8618_audio_writefn, s);

    sysbus_init_mmio(dev, MP_AUDIO_SIZE, iomemtype);

    qemu_register_reset(mv88w8618_audio_reset, s);

    return 0;

}

static SysBusDeviceInfo mv88w8618_audio_info = {

    .init = mv88w8618_audio_init,

    .qdev.name  = "mv88w8618_audio",

    .qdev.size  = sizeof(mv88w8618_audio_state),

    .qdev.props = (Property[]) {

        {

            .name   = "wm8750",

            .info   = &qdev_prop_ptr,

            .offset = offsetof(mv88w8618_audio_state, wm),

        },

        {/* end of list */}

    }

};

#endif

static void mv88w8618_register_devices(void)

{

#ifdef HAS_AUDIO

    sysbus_register_withprop(&mv88w8618_audio_info);

#endif

}

device_init(mv88w8618_register_devices)