root / hw / marvell_88w8618_audio.c @ 60398748
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/*
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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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uint32_t phys_buf; |
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uint32_t target_buffer; |
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uint32_t threshold; |
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uint32_t play_pos; |
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uint32_t 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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} |
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if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
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free_out <<= 1;
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} |
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if (!(s->playback_mode & MP_AUDIO_MONO)) {
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free_out <<= 1;
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} |
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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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} |
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if (block_size > 4096) { |
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return;
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} |
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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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} |
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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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} |
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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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} |
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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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} |
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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(DeviceState *d) |
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{ |
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mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, |
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sysbus_from_qdev(d)); |
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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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s->clock_div = 0;
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s->threshold = 0;
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s->phys_buf = 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 int 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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return 0; |
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} |
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static const VMStateDescription mv88w8618_audio_vmsd = { |
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.name = "mv88w8618_audio",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) { |
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VMSTATE_UINT32(playback_mode, mv88w8618_audio_state), |
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VMSTATE_UINT32(status, mv88w8618_audio_state), |
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VMSTATE_UINT32(irq_enable, mv88w8618_audio_state), |
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VMSTATE_UINT32(phys_buf, mv88w8618_audio_state), |
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VMSTATE_UINT32(target_buffer, mv88w8618_audio_state), |
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VMSTATE_UINT32(threshold, mv88w8618_audio_state), |
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VMSTATE_UINT32(play_pos, mv88w8618_audio_state), |
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VMSTATE_UINT32(last_free, mv88w8618_audio_state), |
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VMSTATE_UINT32(clock_div, mv88w8618_audio_state), |
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VMSTATE_END_OF_LIST() |
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} |
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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.reset = mv88w8618_audio_reset, |
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.qdev.vmsd = &mv88w8618_audio_vmsd, |
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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) |