Archipelago » qemu

/*

 * Marvell 88w8618 audio emulation extracted from

 * Marvell MV88w8618 / Freecom MusicPal emulation.

 *

 * Copyright (c) 2008 Jan Kiszka

 *

 * This code is licensed under the GNU GPL v2.

 *

 * Contributions after 2012-01-13 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "hw/sysbus.h"

#include "hw/hw.h"

#include "hw/i2c/i2c.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)

typedef struct mv88w8618_audio_state {

    SysBusDevice busdev;

    MemoryRegion iomem;

    qemu_irq irq;

    uint32_t playback_mode;

    uint32_t status;

    uint32_t irq_enable;

    uint32_t phys_buf;

    uint32_t target_buffer;

    uint32_t threshold;

    uint32_t play_pos;

    uint32_t last_free;

    uint32_t clock_div;

    void *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, 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 uint64_t mv88w8618_audio_read(void *opaque, hwaddr offset,

                                    unsigned size)

{

    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, hwaddr offset,

                                  uint64_t value, unsigned size)

{

    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(DeviceState *d)

{

    mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state,

                                           SYS_BUS_DEVICE(d));

    s->playback_mode = 0;

    s->status = 0;

    s->irq_enable = 0;

    s->clock_div = 0;

    s->threshold = 0;

    s->phys_buf = 0;

}

static const MemoryRegionOps mv88w8618_audio_ops = {

    .read = mv88w8618_audio_read,

    .write = mv88w8618_audio_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static int mv88w8618_audio_init(SysBusDevice *dev)

{

    mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);

    sysbus_init_irq(dev, &s->irq);

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

    memory_region_init_io(&s->iomem, &mv88w8618_audio_ops, s,

                          "audio", MP_AUDIO_SIZE);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static const VMStateDescription mv88w8618_audio_vmsd = {

    .name = "mv88w8618_audio",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields = (VMStateField[]) {

        VMSTATE_UINT32(playback_mode, mv88w8618_audio_state),

        VMSTATE_UINT32(status, mv88w8618_audio_state),

        VMSTATE_UINT32(irq_enable, mv88w8618_audio_state),

        VMSTATE_UINT32(phys_buf, mv88w8618_audio_state),

        VMSTATE_UINT32(target_buffer, mv88w8618_audio_state),

        VMSTATE_UINT32(threshold, mv88w8618_audio_state),

        VMSTATE_UINT32(play_pos, mv88w8618_audio_state),

        VMSTATE_UINT32(last_free, mv88w8618_audio_state),

        VMSTATE_UINT32(clock_div, mv88w8618_audio_state),

        VMSTATE_END_OF_LIST()

    }

};

static Property mv88w8618_audio_properties[] = {

    DEFINE_PROP_PTR("wm8750", mv88w8618_audio_state, wm),

    {/* end of list */},

};

static void mv88w8618_audio_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = mv88w8618_audio_init;

    dc->reset = mv88w8618_audio_reset;

    dc->vmsd = &mv88w8618_audio_vmsd;

    dc->props = mv88w8618_audio_properties;

}

static const TypeInfo mv88w8618_audio_info = {

    .name          = "mv88w8618_audio",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(mv88w8618_audio_state),

    .class_init    = mv88w8618_audio_class_init,

};

static void mv88w8618_register_types(void)

{

    type_register_static(&mv88w8618_audio_info);

}

type_init(mv88w8618_register_types)