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qemu/hw/audio/marvell_88w8618.c

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/*
* 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 "qemu/osdep.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/audio/wm8750.h"
#include "audio/audio.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qom/object.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)
OBJECT_DECLARE_SIMPLE_TYPE(mv88w8618_audio_state, MV88W8618_AUDIO)
struct mv88w8618_audio_state {
SysBusDevice parent_obj;
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;
};
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 = MV88W8618_AUDIO(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 void mv88w8618_audio_init(Object *obj)
{
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
mv88w8618_audio_state *s = MV88W8618_AUDIO(dev);
sysbus_init_irq(dev, &s->irq);
memory_region_init_io(&s->iomem, obj, &mv88w8618_audio_ops, s,
"audio", MP_AUDIO_SIZE);
sysbus_init_mmio(dev, &s->iomem);
object_property_add_link(OBJECT(dev), "wm8750", TYPE_WM8750,
(Object **) &s->wm,
qdev_prop_allow_set_link_before_realize,
0);
}
static void mv88w8618_audio_realize(DeviceState *dev, Error **errp)
{
mv88w8618_audio_state *s = MV88W8618_AUDIO(dev);
wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);
}
static const VMStateDescription mv88w8618_audio_vmsd = {
.name = "mv88w8618_audio",
.version_id = 1,
.minimum_version_id = 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 void mv88w8618_audio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = mv88w8618_audio_realize;
dc->reset = mv88w8618_audio_reset;
dc->vmsd = &mv88w8618_audio_vmsd;
dc->user_creatable = false;
}
static const TypeInfo mv88w8618_audio_info = {
.name = TYPE_MV88W8618_AUDIO,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(mv88w8618_audio_state),
.instance_init = mv88w8618_audio_init,
.class_init = mv88w8618_audio_class_init,
};
static void mv88w8618_register_types(void)
{
type_register_static(&mv88w8618_audio_info);
}
type_init(mv88w8618_register_types)
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