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275 lines
7.1 KiB
C
275 lines
7.1 KiB
C
/*
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* Marvell 88w8618 audio emulation extracted from
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* Marvell MV88w8618 / Freecom MusicPal emulation.
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*
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* Copyright (c) 2008 Jan Kiszka
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*
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* This code is licenced under the GNU GPL v2.
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*/
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#include "sysbus.h"
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#include "hw.h"
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#include "i2c.h"
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#include "sysbus.h"
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#include "audio/audio.h"
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#define MP_AUDIO_SIZE 0x00001000
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/* Audio register offsets */
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#define MP_AUDIO_PLAYBACK_MODE 0x00
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#define MP_AUDIO_CLOCK_DIV 0x18
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#define MP_AUDIO_IRQ_STATUS 0x20
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#define MP_AUDIO_IRQ_ENABLE 0x24
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#define MP_AUDIO_TX_START_LO 0x28
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#define MP_AUDIO_TX_THRESHOLD 0x2C
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#define MP_AUDIO_TX_STATUS 0x38
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#define MP_AUDIO_TX_START_HI 0x40
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/* Status register and IRQ enable bits */
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#define MP_AUDIO_TX_HALF (1 << 6)
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#define MP_AUDIO_TX_FULL (1 << 7)
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/* Playback mode bits */
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#define MP_AUDIO_16BIT_SAMPLE (1 << 0)
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#define MP_AUDIO_PLAYBACK_EN (1 << 7)
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#define MP_AUDIO_CLOCK_24MHZ (1 << 9)
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#define MP_AUDIO_MONO (1 << 14)
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#ifdef HAS_AUDIO
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typedef struct mv88w8618_audio_state {
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SysBusDevice busdev;
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qemu_irq irq;
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uint32_t playback_mode;
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uint32_t status;
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uint32_t irq_enable;
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unsigned long phys_buf;
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uint32_t target_buffer;
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unsigned int threshold;
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unsigned int play_pos;
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unsigned int last_free;
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uint32_t clock_div;
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DeviceState *wm;
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} mv88w8618_audio_state;
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static void mv88w8618_audio_callback(void *opaque, int free_out, int free_in)
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{
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mv88w8618_audio_state *s = opaque;
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int16_t *codec_buffer;
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int8_t buf[4096];
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int8_t *mem_buffer;
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int pos, block_size;
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if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN))
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return;
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if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)
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free_out <<= 1;
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if (!(s->playback_mode & MP_AUDIO_MONO))
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free_out <<= 1;
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block_size = s->threshold / 2;
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if (free_out - s->last_free < block_size)
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return;
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if (block_size > 4096)
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return;
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cpu_physical_memory_read(s->target_buffer + s->play_pos, (void *)buf,
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block_size);
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mem_buffer = buf;
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if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
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if (s->playback_mode & MP_AUDIO_MONO) {
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codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
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for (pos = 0; pos < block_size; pos += 2) {
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*codec_buffer++ = *(int16_t *)mem_buffer;
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*codec_buffer++ = *(int16_t *)mem_buffer;
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mem_buffer += 2;
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}
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} else
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memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
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(uint32_t *)mem_buffer, block_size);
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} else {
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if (s->playback_mode & MP_AUDIO_MONO) {
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codec_buffer = wm8750_dac_buffer(s->wm, block_size);
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for (pos = 0; pos < block_size; pos++) {
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*codec_buffer++ = cpu_to_le16(256 * *mem_buffer);
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*codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
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}
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} else {
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codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
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for (pos = 0; pos < block_size; pos += 2) {
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*codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
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*codec_buffer++ = cpu_to_le16(256 * *mem_buffer++);
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}
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}
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}
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wm8750_dac_commit(s->wm);
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s->last_free = free_out - block_size;
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if (s->play_pos == 0) {
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s->status |= MP_AUDIO_TX_HALF;
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s->play_pos = block_size;
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} else {
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s->status |= MP_AUDIO_TX_FULL;
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s->play_pos = 0;
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}
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if (s->status & s->irq_enable)
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qemu_irq_raise(s->irq);
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}
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static void mv88w8618_audio_clock_update(mv88w8618_audio_state *s)
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{
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int rate;
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if (s->playback_mode & MP_AUDIO_CLOCK_24MHZ)
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rate = 24576000 / 64; /* 24.576MHz */
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else
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rate = 11289600 / 64; /* 11.2896MHz */
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rate /= ((s->clock_div >> 8) & 0xff) + 1;
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wm8750_set_bclk_in(s->wm, rate);
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}
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static uint32_t mv88w8618_audio_read(void *opaque, target_phys_addr_t offset)
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{
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mv88w8618_audio_state *s = opaque;
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switch (offset) {
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case MP_AUDIO_PLAYBACK_MODE:
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return s->playback_mode;
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case MP_AUDIO_CLOCK_DIV:
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return s->clock_div;
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case MP_AUDIO_IRQ_STATUS:
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return s->status;
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case MP_AUDIO_IRQ_ENABLE:
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return s->irq_enable;
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case MP_AUDIO_TX_STATUS:
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return s->play_pos >> 2;
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default:
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return 0;
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}
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}
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static void mv88w8618_audio_write(void *opaque, target_phys_addr_t offset,
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uint32_t value)
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{
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mv88w8618_audio_state *s = opaque;
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switch (offset) {
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case MP_AUDIO_PLAYBACK_MODE:
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if (value & MP_AUDIO_PLAYBACK_EN &&
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!(s->playback_mode & MP_AUDIO_PLAYBACK_EN)) {
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s->status = 0;
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s->last_free = 0;
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s->play_pos = 0;
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}
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s->playback_mode = value;
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mv88w8618_audio_clock_update(s);
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break;
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case MP_AUDIO_CLOCK_DIV:
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s->clock_div = value;
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s->last_free = 0;
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s->play_pos = 0;
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mv88w8618_audio_clock_update(s);
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break;
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case MP_AUDIO_IRQ_STATUS:
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s->status &= ~value;
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break;
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case MP_AUDIO_IRQ_ENABLE:
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s->irq_enable = value;
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if (s->status & s->irq_enable)
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qemu_irq_raise(s->irq);
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break;
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case MP_AUDIO_TX_START_LO:
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s->phys_buf = (s->phys_buf & 0xFFFF0000) | (value & 0xFFFF);
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s->target_buffer = s->phys_buf;
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s->play_pos = 0;
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s->last_free = 0;
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break;
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case MP_AUDIO_TX_THRESHOLD:
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s->threshold = (value + 1) * 4;
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break;
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case MP_AUDIO_TX_START_HI:
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s->phys_buf = (s->phys_buf & 0xFFFF) | (value << 16);
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s->target_buffer = s->phys_buf;
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s->play_pos = 0;
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s->last_free = 0;
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break;
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}
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}
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static void mv88w8618_audio_reset(void *opaque)
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{
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mv88w8618_audio_state *s = opaque;
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s->playback_mode = 0;
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s->status = 0;
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s->irq_enable = 0;
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}
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static CPUReadMemoryFunc * const mv88w8618_audio_readfn[] = {
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mv88w8618_audio_read,
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mv88w8618_audio_read,
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mv88w8618_audio_read
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};
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static CPUWriteMemoryFunc * const mv88w8618_audio_writefn[] = {
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mv88w8618_audio_write,
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mv88w8618_audio_write,
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mv88w8618_audio_write
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};
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static void mv88w8618_audio_init(SysBusDevice *dev)
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{
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mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
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int iomemtype;
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sysbus_init_irq(dev, &s->irq);
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wm8750_data_req_set(s->wm, mv88w8618_audio_callback, s);
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iomemtype = cpu_register_io_memory(mv88w8618_audio_readfn,
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mv88w8618_audio_writefn, s);
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sysbus_init_mmio(dev, MP_AUDIO_SIZE, iomemtype);
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qemu_register_reset(mv88w8618_audio_reset, s);
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}
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static SysBusDeviceInfo mv88w8618_audio_info = {
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.init = mv88w8618_audio_init,
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.qdev.name = "mv88w8618_audio",
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.qdev.size = sizeof(mv88w8618_audio_state),
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.qdev.props = (Property[]) {
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{
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.name = "wm8750",
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.info = &qdev_prop_ptr,
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.offset = offsetof(mv88w8618_audio_state, wm),
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},
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{/* end of list */}
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}
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};
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#endif
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static void mv88w8618_register_devices(void)
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{
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#ifdef HAS_AUDIO
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sysbus_register_withprop(&mv88w8618_audio_info);
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#endif
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}
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device_init(mv88w8618_register_devices)
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