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qemu/hw/audio/lm4549.c

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/*
* LM4549 Audio Codec Interface
*
* Copyright (c) 2011
* Written by Mathieu Sonet - www.elasticsheep.com
*
* This code is licensed under the GPL.
*
* *****************************************************************
*
* This driver emulates the LM4549 codec.
*
* It supports only one playback voice and no record voice.
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "audio/audio.h"
#include "lm4549.h"
#if 0
#define LM4549_DEBUG 1
#endif
#if 0
#define LM4549_DUMP_DAC_INPUT 1
#endif
#ifdef LM4549_DEBUG
#define DPRINTF(fmt, ...) \
do { printf("lm4549: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#if defined(LM4549_DUMP_DAC_INPUT)
static FILE *fp_dac_input;
#endif
/* LM4549 register list */
enum {
LM4549_Reset = 0x00,
LM4549_Master_Volume = 0x02,
LM4549_Line_Out_Volume = 0x04,
LM4549_Master_Volume_Mono = 0x06,
LM4549_PC_Beep_Volume = 0x0A,
LM4549_Phone_Volume = 0x0C,
LM4549_Mic_Volume = 0x0E,
LM4549_Line_In_Volume = 0x10,
LM4549_CD_Volume = 0x12,
LM4549_Video_Volume = 0x14,
LM4549_Aux_Volume = 0x16,
LM4549_PCM_Out_Volume = 0x18,
LM4549_Record_Select = 0x1A,
LM4549_Record_Gain = 0x1C,
LM4549_General_Purpose = 0x20,
LM4549_3D_Control = 0x22,
LM4549_Powerdown_Ctrl_Stat = 0x26,
LM4549_Ext_Audio_ID = 0x28,
LM4549_Ext_Audio_Stat_Ctrl = 0x2A,
LM4549_PCM_Front_DAC_Rate = 0x2C,
LM4549_PCM_ADC_Rate = 0x32,
LM4549_Vendor_ID1 = 0x7C,
LM4549_Vendor_ID2 = 0x7E
};
static void lm4549_reset(lm4549_state *s)
{
uint16_t *regfile = s->regfile;
regfile[LM4549_Reset] = 0x0d50;
regfile[LM4549_Master_Volume] = 0x8008;
regfile[LM4549_Line_Out_Volume] = 0x8000;
regfile[LM4549_Master_Volume_Mono] = 0x8000;
regfile[LM4549_PC_Beep_Volume] = 0x0000;
regfile[LM4549_Phone_Volume] = 0x8008;
regfile[LM4549_Mic_Volume] = 0x8008;
regfile[LM4549_Line_In_Volume] = 0x8808;
regfile[LM4549_CD_Volume] = 0x8808;
regfile[LM4549_Video_Volume] = 0x8808;
regfile[LM4549_Aux_Volume] = 0x8808;
regfile[LM4549_PCM_Out_Volume] = 0x8808;
regfile[LM4549_Record_Select] = 0x0000;
regfile[LM4549_Record_Gain] = 0x8000;
regfile[LM4549_General_Purpose] = 0x0000;
regfile[LM4549_3D_Control] = 0x0101;
regfile[LM4549_Powerdown_Ctrl_Stat] = 0x000f;
regfile[LM4549_Ext_Audio_ID] = 0x0001;
regfile[LM4549_Ext_Audio_Stat_Ctrl] = 0x0000;
regfile[LM4549_PCM_Front_DAC_Rate] = 0xbb80;
regfile[LM4549_PCM_ADC_Rate] = 0xbb80;
regfile[LM4549_Vendor_ID1] = 0x4e53;
regfile[LM4549_Vendor_ID2] = 0x4331;
}
static void lm4549_audio_transfer(lm4549_state *s)
{
uint32_t written_bytes, written_samples;
uint32_t i;
/* Activate the voice */
AUD_set_active_out(s->voice, 1);
s->voice_is_active = 1;
/* Try to write the buffer content */
written_bytes = AUD_write(s->voice, s->buffer,
s->buffer_level * sizeof(uint16_t));
written_samples = written_bytes >> 1;
#if defined(LM4549_DUMP_DAC_INPUT)
fwrite(s->buffer, sizeof(uint8_t), written_bytes, fp_dac_input);
#endif
s->buffer_level -= written_samples;
if (s->buffer_level > 0) {
/* Move the data back to the start of the buffer */
for (i = 0; i < s->buffer_level; i++) {
s->buffer[i] = s->buffer[i + written_samples];
}
}
}
static void lm4549_audio_out_callback(void *opaque, int free)
{
lm4549_state *s = (lm4549_state *)opaque;
static uint32_t prev_buffer_level;
#ifdef LM4549_DEBUG
int size = AUD_get_buffer_size_out(s->voice);
DPRINTF("audio_out_callback size = %i free = %i\n", size, free);
#endif
/* Detect that no data are consumed
=> disable the voice */
if (s->buffer_level == prev_buffer_level) {
AUD_set_active_out(s->voice, 0);
s->voice_is_active = 0;
}
prev_buffer_level = s->buffer_level;
/* Check if a buffer transfer is pending */
if (s->buffer_level == LM4549_BUFFER_SIZE) {
lm4549_audio_transfer(s);
/* Request more data */
if (s->data_req_cb != NULL) {
(s->data_req_cb)(s->opaque);
}
}
}
uint32_t lm4549_read(lm4549_state *s, hwaddr offset)
{
uint16_t *regfile = s->regfile;
uint32_t value = 0;
/* Read the stored value */
assert(offset < 128);
value = regfile[offset];
DPRINTF("read [0x%02x] = 0x%04x\n", offset, value);
return value;
}
void lm4549_write(lm4549_state *s,
hwaddr offset, uint32_t value)
{
uint16_t *regfile = s->regfile;
assert(offset < 128);
DPRINTF("write [0x%02x] = 0x%04x\n", offset, value);
switch (offset) {
case LM4549_Reset:
lm4549_reset(s);
break;
case LM4549_PCM_Front_DAC_Rate:
regfile[LM4549_PCM_Front_DAC_Rate] = value;
DPRINTF("DAC rate change = %i\n", value);
/* Re-open a voice with the new sample rate */
struct audsettings as;
as.freq = value;
as.nchannels = 2;
as.fmt = AUDIO_FORMAT_S16;
as.endianness = 0;
s->voice = AUD_open_out(
&s->card,
s->voice,
"lm4549.out",
s,
lm4549_audio_out_callback,
&as
);
break;
case LM4549_Powerdown_Ctrl_Stat:
value &= ~0xf;
value |= regfile[LM4549_Powerdown_Ctrl_Stat] & 0xf;
regfile[LM4549_Powerdown_Ctrl_Stat] = value;
break;
case LM4549_Ext_Audio_ID:
case LM4549_Vendor_ID1:
case LM4549_Vendor_ID2:
DPRINTF("Write to read-only register 0x%x\n", (int)offset);
break;
default:
/* Store the new value */
regfile[offset] = value;
break;
}
}
uint32_t lm4549_write_samples(lm4549_state *s, uint32_t left, uint32_t right)
{
/* The left and right samples are in 20-bit resolution.
The LM4549 has 18-bit resolution and only uses the bits [19:2].
This model supports 16-bit playback.
*/
if (s->buffer_level > LM4549_BUFFER_SIZE - 2) {
DPRINTF("write_sample Buffer full\n");
return 0;
}
/* Store 16-bit samples in the buffer */
s->buffer[s->buffer_level++] = (left >> 4);
s->buffer[s->buffer_level++] = (right >> 4);
if (s->buffer_level == LM4549_BUFFER_SIZE) {
/* Trigger the transfer of the buffer to the audio host */
lm4549_audio_transfer(s);
}
return 1;
}
static int lm4549_post_load(void *opaque, int version_id)
{
lm4549_state *s = (lm4549_state *)opaque;
uint16_t *regfile = s->regfile;
/* Re-open a voice with the current sample rate */
uint32_t freq = regfile[LM4549_PCM_Front_DAC_Rate];
DPRINTF("post_load freq = %i\n", freq);
DPRINTF("post_load voice_is_active = %i\n", s->voice_is_active);
struct audsettings as;
as.freq = freq;
as.nchannels = 2;
as.fmt = AUDIO_FORMAT_S16;
as.endianness = 0;
s->voice = AUD_open_out(
&s->card,
s->voice,
"lm4549.out",
s,
lm4549_audio_out_callback,
&as
);
/* Request data */
if (s->voice_is_active == 1) {
lm4549_audio_out_callback(s, AUD_get_buffer_size_out(s->voice));
}
return 0;
}
void lm4549_init(lm4549_state *s, lm4549_callback data_req_cb, void* opaque)
{
struct audsettings as;
/* Store the callback and opaque pointer */
s->data_req_cb = data_req_cb;
s->opaque = opaque;
/* Init the registers */
lm4549_reset(s);
/* Register an audio card */
AUD_register_card("lm4549", &s->card);
/* Open a default voice */
as.freq = 48000;
as.nchannels = 2;
as.fmt = AUDIO_FORMAT_S16;
as.endianness = 0;
s->voice = AUD_open_out(
&s->card,
s->voice,
"lm4549.out",
s,
lm4549_audio_out_callback,
&as
);
AUD_set_volume_out(s->voice, 0, 255, 255);
s->voice_is_active = 0;
/* Reset the input buffer */
memset(s->buffer, 0x00, sizeof(s->buffer));
s->buffer_level = 0;
#if defined(LM4549_DUMP_DAC_INPUT)
fp_dac_input = fopen("lm4549_dac_input.pcm", "wb");
if (!fp_dac_input) {
hw_error("Unable to open lm4549_dac_input.pcm for writing\n");
}
#endif
}
const VMStateDescription vmstate_lm4549_state = {
.name = "lm4549_state",
.version_id = 1,
.minimum_version_id = 1,
.post_load = lm4549_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32(voice_is_active, lm4549_state),
VMSTATE_UINT16_ARRAY(regfile, lm4549_state, 128),
VMSTATE_UINT16_ARRAY(buffer, lm4549_state, LM4549_BUFFER_SIZE),
VMSTATE_UINT32(buffer_level, lm4549_state),
VMSTATE_END_OF_LIST()
}
};
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