hw/marvell_88w8618_audio.c - qemu - Git at Google

 /*
  * Marvell 88w8618 audio emulation extracted from
  * Marvell MV88w8618 / Freecom MusicPal emulation.
  *
  * Copyright (c) 2008 Jan Kiszka
  *
  * This code is licenced under the GNU GPL v2.
  */
 #include "sysbus.h"
 #include "hw.h"
 #include "i2c.h"
 #include "sysbus.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;
     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;
     DeviceState *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, (void *)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 uint32_t mv88w8618_audio_read(void *opaque, target_phys_addr_t offset)
 {
     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, target_phys_addr_t offset,
                                  uint32_t value)
 {
     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,
                                            sysbus_from_qdev(d));

     s->playback_mode = 0;
     s->status = 0;
     s->irq_enable = 0;
     s->clock_div = 0;
     s->threshold = 0;
     s->phys_buf = 0;
 }

 static CPUReadMemoryFunc * const mv88w8618_audio_readfn[] = {
     mv88w8618_audio_read,
     mv88w8618_audio_read,
     mv88w8618_audio_read
 };

 static CPUWriteMemoryFunc * const mv88w8618_audio_writefn[] = {
     mv88w8618_audio_write,
     mv88w8618_audio_write,
     mv88w8618_audio_write
 };

 static int mv88w8618_audio_init(SysBusDevice *dev)
 {
     mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
     int iomemtype;

     sysbus_init_irq(dev, &s->irq);

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

     iomemtype = cpu_register_io_memory(mv88w8618_audio_readfn,
                                        mv88w8618_audio_writefn, s,
                                        DEVICE_NATIVE_ENDIAN);
     sysbus_init_mmio(dev, MP_AUDIO_SIZE, iomemtype);

     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 SysBusDeviceInfo mv88w8618_audio_info = {
     .init = mv88w8618_audio_init,
     .qdev.name  = "mv88w8618_audio",
     .qdev.size  = sizeof(mv88w8618_audio_state),
     .qdev.reset = mv88w8618_audio_reset,
     .qdev.vmsd  = &mv88w8618_audio_vmsd,
     .qdev.props = (Property[]) {
         {
             .name   = "wm8750",
             .info   = &qdev_prop_ptr,
             .offset = offsetof(mv88w8618_audio_state, wm),
         },
         {/* end of list */}
     }
 };

 static void mv88w8618_register_devices(void)
 {
     sysbus_register_withprop(&mv88w8618_audio_info);
 }

 device_init(mv88w8618_register_devices)
	/*
	* Marvell 88w8618 audio emulation extracted from
	* Marvell MV88w8618 / Freecom MusicPal emulation.
	*
	* Copyright (c) 2008 Jan Kiszka
	*
	* This code is licenced under the GNU GPL v2.
	*/
	#include "sysbus.h"
	#include "hw.h"
	#include "i2c.h"
	#include "sysbus.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;
	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;
	DeviceState *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, (void *)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 uint32_t mv88w8618_audio_read(void *opaque, target_phys_addr_t offset)
	{
	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, target_phys_addr_t offset,
	uint32_t value)
	{
	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,
	sysbus_from_qdev(d));

	s->playback_mode = 0;
	s->status = 0;
	s->irq_enable = 0;
	s->clock_div = 0;
	s->threshold = 0;
	s->phys_buf = 0;
	}

	static CPUReadMemoryFunc * const mv88w8618_audio_readfn[] = {
	mv88w8618_audio_read,
	mv88w8618_audio_read,
	mv88w8618_audio_read
	};

	static CPUWriteMemoryFunc * const mv88w8618_audio_writefn[] = {
	mv88w8618_audio_write,
	mv88w8618_audio_write,
	mv88w8618_audio_write
	};

	static int mv88w8618_audio_init(SysBusDevice *dev)
	{
	mv88w8618_audio_state *s = FROM_SYSBUS(mv88w8618_audio_state, dev);
	int iomemtype;

	sysbus_init_irq(dev, &s->irq);

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

	iomemtype = cpu_register_io_memory(mv88w8618_audio_readfn,
	mv88w8618_audio_writefn, s,
	DEVICE_NATIVE_ENDIAN);
	sysbus_init_mmio(dev, MP_AUDIO_SIZE, iomemtype);

	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 SysBusDeviceInfo mv88w8618_audio_info = {
	.init = mv88w8618_audio_init,
	.qdev.name = "mv88w8618_audio",
	.qdev.size = sizeof(mv88w8618_audio_state),
	.qdev.reset = mv88w8618_audio_reset,
	.qdev.vmsd = &mv88w8618_audio_vmsd,
	.qdev.props = (Property[]) {
	{
	.name = "wm8750",
	.info = &qdev_prop_ptr,
	.offset = offsetof(mv88w8618_audio_state, wm),
	},
	{/* end of list */}
	}
	};

	static void mv88w8618_register_devices(void)
	{
	sysbus_register_withprop(&mv88w8618_audio_info);
	}

	device_init(mv88w8618_register_devices)