[PATCH] ALSA driver for Yamaa AICA on Sega Dreamcast

[Adrian McMenamin <adrian@mcmen.demon.co.uk>]

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Takashi,

Here is a second attempt at this - this time built against the
alsa-driver sources rather than the kernel mainline. please consider for
submission to alsa-driver.

Signed off by Adrian McMenamin <adrian@mcmen.demon.co.uk>

Adrian



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diff -ruN --exclude=acore --exclude='.#*' ./sh/aica.c /home/adrian/alsa-driver/sh/aica.c
--- ./sh/aica.c	1970-01-01 01:00:00.000000000 +0100
+++ /home/adrian/alsa-driver/sh/aica.c	2006-04-16 23:13:59.000000000 +0100
@@ -0,0 +1,833 @@
+/*
+* This code is licenced under 
+* the General Public Licence
+* version 2
+*
+* Copyright Adrian McMenamin 2005, 2006
+* <adrian@mcmen.demon.co.uk>
+* See also http://newgolddream.dyndns.info/cgi-bin/cvsweb
+* 
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of version 2 of the GNU General Public License as published by
+* the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*
+*/
+
+
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/wait.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/firmware.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <asm-sh/io.h>
+#include <asm-sh/dma.h>
+#include <asm-sh/dreamcast/sysasic.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/info.h>
+#include "aica.h"
+
+
+MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
+MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
+
+/* module parameters */
+#define CARD_NAME "AICA"
+
+static int index;
+static char *id = NULL;
+static int enable = 1;
+
+module_param(index, int, 0444);
+MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
+module_param(id, charp, 0444);
+MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
+module_param(enable, bool, 0644);
+MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
+
+
+
+/* Spinlocks */
+spinlock_t spu_memlock = SPIN_LOCK_UNLOCKED;
+spinlock_t spu_dmalock = SPIN_LOCK_UNLOCKED;
+
+
+/* SPU specific functions */
+
+/* spu_write_wait - wait for G2-SH FIFO to clear */
+static inline void spu_write_wait(void)
+{
+	int time_count;
+	time_count = 0;
+	while (1) {
+		if (!(readl(G2_FIFO) & 0x11))
+			break;
+		/* To ensure hardware failure doesn't wedge kernel */
+		time_count++;
+		if (time_count > 0x10000)
+			break;
+	}
+
+	return;
+}
+
+
+/* spu_memset - write to memory in SPU address space */
+static void spu_memset(uint32_t toi, void __iomem * what, int length)
+{
+	uint32_t *to = (uint32_t *) (SPU_MEMORY_BASE + toi);
+	int i;
+
+
+	if (length % 4)
+		length = (length / 4) + 1;
+	else
+		length = length / 4;
+	spu_write_wait();
+	for (i = 0; i < length; i++) {
+		spin_lock(&spu_memlock);
+		writel(what, to);
+		spin_unlock(&spu_memlock);
+		to++;
+		if (i && !(i % 8))
+			spu_write_wait();
+	}
+	return;
+}
+
+/* spu_memload - write to SPU address space */
+static void spu_memload(uint32_t toi, void __iomem * from, int length)
+{
+	uint32_t __iomem *froml = from;
+	uint32_t __iomem *to =
+	    (uint32_t __iomem *) (SPU_MEMORY_BASE + toi);
+	int i, val;
+	if (length % 4)
+		length = (length / 4) + 1;
+	else
+		length = length / 4;
+	spu_write_wait();
+	for (i = 0; i < length; i++) {
+		val = *froml;
+		spin_lock(&spu_memlock);
+		writel(val, to);
+		spin_unlock(&spu_memlock);
+		froml++;
+		to++;
+		if (i && !(i % 8))
+			spu_write_wait();
+	}
+	return;
+
+}
+
+/* spu_disable - set spu registers to stop sound output */
+static void spu_disable(void)
+{
+	int i;
+	uint32_t regval;
+	spu_write_wait();
+	regval = readl(ARM_RESET_REGISTER);
+	regval |= 1;
+	spu_write_wait();
+	spin_lock(&spu_memlock);
+	writel(regval, ARM_RESET_REGISTER);
+	spin_unlock(&spu_memlock);
+	for (i = 0; i < 64; i++) {
+		spu_write_wait();
+		regval = readl(SPU_REGISTER_BASE + (i * 0x80));
+		regval = (regval & ~0x4000) | 0x8000;
+		spu_write_wait();
+		spin_lock(&spu_memlock);
+		writel(regval, SPU_REGISTER_BASE + (i * 0x80));
+		spin_unlock(&spu_memlock);
+
+	}
+
+}
+
+/* spu_enable - set spu registers to enable sound output */
+static void spu_enable(void)
+{
+	uint32_t regval = readl(ARM_RESET_REGISTER);
+	regval &= ~1;
+	spu_write_wait();
+	spin_lock(&spu_memlock);
+	writel(regval, ARM_RESET_REGISTER);
+	spin_unlock(&spu_memlock);
+	return;
+
+}
+
+
+/* Halt the sound processor,
+   clear the memory,
+   load some default ARM7 code,
+   and then restart ARM7
+*/
+static int spu_init(void)
+{
+
+	spu_disable();
+	spu_memset(0, 0, 0x200000 / 4);
+	*(uint32_t *) SPU_MEMORY_BASE = 0xea000002;
+	spu_enable();
+	schedule();
+	return 0;
+}
+
+
+
+
+/* aica_chn_start - write to spu to start playback */
+inline static void aica_chn_start(void)
+{
+	spu_write_wait();
+	spin_lock(&spu_memlock);
+	writel(AICA_CMD_KICK | AICA_CMD_START,
+	       (uint32_t *) AICA_CONTROL_POINT);
+	spin_unlock(&spu_memlock);
+
+}
+
+/* aica_chn_halt - write to spu to halt playback */
+inline static void aica_chn_halt(void)
+{
+	spu_write_wait();
+	spin_lock(&spu_memlock);
+	writel(AICA_CMD_KICK | AICA_CMD_STOP,
+	       (uint32_t *) AICA_CONTROL_POINT);
+	spin_unlock(&spu_memlock);
+
+}
+
+
+/* ALSA code below */
+
+static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
+
+	.info = (SNDRV_PCM_INFO_NONINTERLEAVED),
+	.formats =
+	    (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
+	     SNDRV_PCM_FMTBIT_IMA_ADPCM),
+	.rates = SNDRV_PCM_RATE_8000_48000,
+	.rate_min = 8000,
+	.rate_max = 48000,
+	.channels_min = 1,
+	.channels_max = 2,
+	.buffer_bytes_max = AICA_BUFFER_SIZE,
+	.period_bytes_min = AICA_PERIOD_SIZE,
+	.period_bytes_max = AICA_PERIOD_SIZE,
+	.periods_min = AICA_PERIOD_NUMBER,
+	.periods_max = AICA_PERIOD_NUMBER,
+};
+
+/* Simple platform device */
+static struct platform_device *pd = NULL;
+
+
+
+static int stereo_buffer_transfer(struct snd_pcm_substream *substream,
+				  int buffer_size, int period)
+{
+	int transferred;
+	struct snd_pcm_runtime *runtime;
+	int period_offset;
+	period_offset = period;
+	period_offset %= (AICA_PERIOD_NUMBER / 2);
+	runtime = substream->runtime;
+
+	/* transfer left and then right */
+	spin_lock(&spu_dmalock);
+	dma_xfer(0,
+		 runtime->dma_area + (AICA_PERIOD_SIZE * period_offset),
+		 AICA_CHANNEL0_OFFSET + (AICA_PERIOD_SIZE * period_offset),
+		 buffer_size / 2, 5);
+	/* wait for completion */
+	do {
+		udelay(5);
+		transferred = get_dma_residue(0);
+	}
+	while (transferred < buffer_size / 2);
+	dma_xfer(0,
+		 AICA_BUFFER_SIZE / 2 + runtime->dma_area +
+		 (AICA_PERIOD_SIZE * period_offset),
+		 AICA_CHANNEL1_OFFSET + (AICA_PERIOD_SIZE * period_offset),
+		 buffer_size / 2, 5);
+	/* have to wait again */
+	do {
+		udelay(5);
+		transferred = get_dma_residue(0);
+	}
+	while (transferred < buffer_size / 2);
+	spin_unlock(&spu_dmalock);
+	return 0;
+}
+
+
+
+
+void static aica_period_elapsed(unsigned long timer_var)
+{
+	int transferred;
+	int play_period;
+	struct snd_pcm_runtime *runtime;
+	struct snd_pcm_substream *substream;
+	struct snd_card_aica *dreamcastcard;
+	substream = (struct snd_pcm_substream *) timer_var;
+	runtime = substream->runtime;
+	dreamcastcard =
+	    (struct snd_card_aica *) (substream->pcm->private_data);
+	/* Have we played out an additional period? */
+	play_period =
+	    frames_to_bytes(runtime,
+			    readl
+			    (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
+	    AICA_PERIOD_SIZE;
+	if (play_period == dreamcastcard->current_period) {
+		dreamcastcard->timer.expires = jiffies + 1;
+		add_timer(&(dreamcastcard->timer));
+		return;
+	}
+	if (runtime->channels > 1) {
+		dreamcastcard->current_period = play_period;	/*TO DO: Work out why this doesn't work for 1 channel */
+
+		stereo_buffer_transfer(dreamcastcard->substream,
+				       AICA_PERIOD_SIZE * 2,
+				       dreamcastcard->clicks);
+	} else {
+		spin_lock(&spu_dmalock);
+		dma_xfer(0,
+			 runtime->dma_area +
+			 (AICA_PERIOD_SIZE * dreamcastcard->clicks),
+			 AICA_CHANNEL0_OFFSET +
+			 (AICA_PERIOD_SIZE * dreamcastcard->clicks),
+			 AICA_PERIOD_SIZE, 5);
+		do {
+			/* Try to fine tune the delay to keep it as short as possible */
+			udelay(5);
+			/* get_dma_residue reports residue until completion when it reports total bytes transferred */
+			transferred = get_dma_residue(0);
+		}
+		while (transferred < AICA_PERIOD_SIZE);
+		spin_unlock(&spu_dmalock);
+	}
+
+	snd_pcm_period_elapsed(dreamcastcard->substream);
+	dreamcastcard->clicks++;
+	dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
+	/* reschedule the timer */
+	dreamcastcard->timer.expires = jiffies + 1;
+	add_timer(&(dreamcastcard->timer));
+	return;
+}
+
+static int snd_aicapcm_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime;
+	struct aica_channel *channel;
+	struct snd_card_aica *dreamcastcard;
+
+	if (!enable)
+		return -ENOENT;
+	dreamcastcard =
+	    (struct snd_card_aica *) (substream->pcm->private_data);
+	channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
+	if (!channel)
+		return -ENOMEM;
+	/* set defaults for channel */
+	channel->sfmt = SM_8BIT;
+	channel->cmd = AICA_CMD_START;
+	channel->vol = dreamcastcard->master_volume;
+	channel->pan = 0x80;
+	channel->pos = 0;
+	channel->flags = 0;	/* default to mono */
+	dreamcastcard->channel = channel;
+	runtime = substream->runtime;
+	runtime->hw = snd_pcm_aica_playback_hw;
+	spu_enable();
+	dreamcastcard->clicks = 0;
+	dreamcastcard->current_period = 0;
+	return 0;
+
+}
+
+static int snd_aicapcm_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_card_aica *dreamcastcard =
+	    (struct snd_card_aica *) (substream->pcm->private_data);
+	del_timer(&dreamcastcard->timer);
+	kfree(dreamcastcard->channel);
+	spu_disable();
+	return 0;
+}
+
+static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	/* Free the DMA buffer */
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream *substream,
+				     struct snd_pcm_hw_params *hw_params)
+{
+	/* Allocate a DMA buffer using ALSA built-ins */
+	return
+	    snd_pcm_lib_malloc_pages(substream,
+				     params_buffer_bytes(hw_params));
+}
+
+static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream *substream)
+{
+
+	struct snd_card_aica *dreamcastcard =
+	    (struct snd_card_aica *) (substream->pcm->private_data);
+	/* Set up the playback */
+	/* basic settings to test working */
+	if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
+		dreamcastcard->channel->sfmt = SM_16BIT;
+	dreamcastcard->channel->freq = substream->runtime->rate;
+	dreamcastcard->substream = substream;
+	return 0;
+}
+
+
+static void startup_aica(struct snd_card_aica *dreamcastcard)
+{
+	spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
+		    (uint8_t *) dreamcastcard->channel,
+		    sizeof(struct aica_channel));
+	aica_chn_start();
+	return;
+}
+
+
+static void spu_begin_dma(struct snd_pcm_substream *substream)
+{
+	int buffer_size;
+	snd_pcm_runtime_t *runtime;
+	struct snd_card_aica *dreamcastcard =
+	    (struct snd_card_aica *) (substream->pcm->private_data);
+	runtime = substream->runtime;
+	buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
+	if (runtime->channels == 1) {
+		spin_lock(&spu_dmalock);
+		dma_xfer(0, runtime->dma_area, AICA_CHANNEL0_OFFSET,
+			 buffer_size, 5);
+		spin_unlock(&spu_dmalock);
+	} else {
+		int transfer_status;
+		dreamcastcard->channel->flags |= 0x01;
+		transfer_status =
+		    stereo_buffer_transfer(substream, buffer_size, 0);
+		if (transfer_status != 0)
+			return;
+		dreamcastcard->clicks =
+		    buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
+	}
+	startup_aica(dreamcastcard);
+	/* Timer may already be running - if so delete it */
+	if (dreamcastcard->timer.data)
+		del_timer(&dreamcastcard->timer);
+
+	init_timer(&(dreamcastcard->timer));
+	dreamcastcard->timer.data = (unsigned long) substream;
+	dreamcastcard->timer.function = aica_period_elapsed;
+
+
+	dreamcastcard->timer.expires = jiffies + 4;
+	add_timer(&(dreamcastcard->timer));
+	return;
+}
+
+static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream *substream,
+				   int cmd)
+{
+	struct snd_card_aica *dreamcastcard;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		spu_begin_dma(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		dreamcastcard =
+		    (struct snd_card_aica *) (substream->pcm->
+					      private_data);
+
+		if (dreamcastcard->timer.data)
+			del_timer(&dreamcastcard->timer);
+		aica_chn_halt();
+		break;
+	default:
+		return -EINVAL;
+	}
+
+
+	return 0;
+}
+
+static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
+					     *substream)
+{
+	return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
+
+}
+
+
+static struct snd_pcm_ops snd_aicapcm_playback_ops = {
+	.open = snd_aicapcm_pcm_open,
+	.close = snd_aicapcm_pcm_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_aicapcm_pcm_hw_params,
+	.hw_free = snd_aicapcm_pcm_hw_free,
+	.prepare = snd_aicapcm_pcm_prepare,
+	.trigger = snd_aicapcm_pcm_trigger,
+	.pointer = snd_aicapcm_pcm_pointer,
+};
+
+
+static void snd_aicapcm_free(void)
+{
+	release_mem_region(ARM_RESET_REGISTER, 0x4);
+	release_mem_region(SPU_MEMORY_BASE, 0x200000);
+}
+
+/* TO DO: set up to handle more than one pcm instance */
+
+
+static int __init snd_aicapcmchip(struct snd_card_aica *dreamcastcard,
+				  int pcm_index)
+{
+	struct snd_pcm *pcm;
+	int err;
+
+	/* Can we lock the memory */
+
+	if (request_mem_region(ARM_RESET_REGISTER, 4, "AICA ARM control")
+	    == NULL)
+		return -ENOMEM;
+	if (request_mem_region(SPU_MEMORY_BASE, 0x200000, "AICA Sound RAM")
+	    == NULL) {
+		release_mem_region(ARM_RESET_REGISTER, 0x4);
+		return -ENOMEM;
+	}
+
+	/* AICA has no capture ability */
+	if ((err =
+	     snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
+			 &pcm)) < 0)
+		return err;
+	pcm->private_data = dreamcastcard;
+	strcpy(pcm->name, "AICA PCM");
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+			&snd_aicapcm_playback_ops);
+
+	/* Allocate the DMA buffers */
+	err =
+	    snd_pcm_lib_preallocate_pages_for_all(pcm,
+						  SNDRV_DMA_TYPE_CONTINUOUS,
+						  snd_dma_continuous_data
+						  (GFP_KERNEL),
+						  AICA_BUFFER_SIZE,
+						  AICA_BUFFER_SIZE);
+
+	return err;
+}
+
+/* Mixer controls */
+static int aica_pcmswitch_info(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.integer.value[0] = 1;	/* TO DO: Fix me */
+	return 0;
+}
+
+static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	if (ucontrol->value.integer.value[0] == 1)
+		return 0;	/* TO DO: Fix me */
+	else
+		aica_chn_halt();
+	return 0;
+}
+
+
+
+
+static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_info *uinfo)
+{
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 0xFF;
+
+	return 0;
+}
+
+static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_card_aica *dreamcastcard;
+	dreamcastcard = (struct snd_card_aica *) kcontrol->private_value;
+	if (!dreamcastcard->channel)
+		return -ETXTBSY;	/* we've not yet been set up */
+	ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
+	return 0;
+}
+
+static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_card_aica *dreamcastcard;
+	dreamcastcard = (struct snd_card_aica *) kcontrol->private_value;
+
+	if (!dreamcastcard->channel) {
+		snd_printk("No channel yet\n");
+		return -ETXTBSY;	/* too soon */
+	}
+
+	else if (dreamcastcard->channel->vol ==
+		 ucontrol->value.integer.value[0])
+		return 0;
+
+	else {
+		dreamcastcard->channel->vol =
+		    ucontrol->value.integer.value[0];
+		dreamcastcard->master_volume =
+		    ucontrol->value.integer.value[0];
+		spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
+			    (uint8_t *) dreamcastcard->channel,
+			    sizeof(struct aica_channel));
+	}
+	return 1;
+}
+
+
+static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "PCM Playback Switch",
+	.index = 0,
+	.private_value = 0xffff,
+	.info = aica_pcmswitch_info,
+	.get = aica_pcmswitch_get,
+	.put = aica_pcmswitch_put
+};
+
+
+
+static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "PCM Playback Volume",
+	.index = 0,
+	.private_value = 0xffff,
+	.info = aica_pcmvolume_info,
+	.get = aica_pcmvolume_get,
+	.put = aica_pcmvolume_put
+};
+
+static int remove_dreamcastcard(struct device *dreamcast_device)
+{
+	struct snd_card_aica *dreamcastcard =
+	    (struct snd_card_aica *) dreamcast_device->driver_data;
+	snd_aicapcm_free();
+	snd_card_free(dreamcastcard->card);
+	kfree(dreamcastcard);
+	return 0;
+
+}
+
+
+static struct device_driver aica_driver = {
+	.name = "AICA",
+	.bus = &platform_bus_type,
+	.remove = remove_dreamcastcard,
+};
+
+
+/* Fill up the members of the embedded device structure */
+
+static void populate_dreamcastaicadev(struct device *dev)
+{
+	dev->bus = &platform_bus_type;
+	dev->driver = &aica_driver;
+	driver_register(dev->driver);
+	device_bind_driver(dev);
+}
+
+static int load_aica_firmware()
+{
+	int err;
+	err = 0;
+	spu_init();
+	const struct firmware *fw_entry;
+	err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
+	if (err)
+		return err;
+	/* write firware into memory */
+	spu_disable();
+	spu_memload(0, fw_entry->data, fw_entry->size);
+	spu_enable();
+	release_firmware(fw_entry);
+	return err;
+}
+
+static int __devinit add_aicamixer_controls(struct snd_card_aica
+					    *dreamcastcard)
+{
+	int err;
+	err = snd_ctl_add
+	    (dreamcastcard->card,
+	     snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
+	if (err < 0) {
+		snd_printk("pcmvolume failed\n");
+		return err;
+	}
+
+
+	err = snd_ctl_add
+	    (dreamcastcard->card,
+	     snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
+	if (err < 0) {
+		snd_printk("pcmswitch failed\n");
+		return err;
+	}
+
+	/* succeeded */
+	return 0;
+}
+
+
+
+static int __init aica_init(void)
+{
+
+
+	int err;
+	struct snd_card_aica *dreamcastcard;
+
+	/* Are we in a Dreamcast at all? */
+	if (!mach_is_dreamcast())
+		return -ENODEV;
+	dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
+	if (!dreamcastcard)
+		return -ENOMEM;
+	dreamcastcard->card = snd_card_new(-1, "AICA", THIS_MODULE, 0);
+	if (!dreamcastcard->card) {
+		kfree(dreamcastcard);
+		return -ENODEV;
+	}
+	strcpy(dreamcastcard->card->driver, "snd_aica");
+	strcpy(dreamcastcard->card->shortname, "AICA");
+	strcpy(dreamcastcard->card->longname,
+	       "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
+
+	/* Load the PCM 'chip' */
+	if ((err = snd_aicapcmchip(dreamcastcard, 0)) < 0)
+		goto freedreamcast;
+
+
+	pd = platform_device_register_simple(dreamcastcard->card->driver,
+					     -1, NULL, 0);
+
+	if (IS_ERR(pd)) {
+		err = -ENODEV;
+		goto freepcm;
+	}
+
+	populate_dreamcastaicadev(&pd->dev);
+	snd_card_set_dev(dreamcastcard->card, &pd->dev);
+	pd->dev.driver_data = dreamcastcard;
+	dreamcastcard->timer.data = 0;
+	dreamcastcard->channel = NULL;
+
+	/* Load the firmware */
+	if ((err = load_aica_firmware()) < 0)
+		goto freepcm;
+
+	/* Add basic controls */
+	if (add_aicamixer_controls(dreamcastcard) < 0)
+		goto freepcm;
+
+
+	/* Register the card with ALSA subsystem */
+	if ((err = snd_card_register(dreamcastcard->card)) < 0)
+		goto freepcm;
+
+
+	snd_printk
+	    ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
+
+	return 0;
+
+      freepcm:
+	snd_aicapcm_free();
+
+      freedreamcast:
+	snd_card_free(dreamcastcard->card);
+
+	if (pd) {
+		struct device_driver *drv = (&pd->dev)->driver;
+		device_release_driver(&pd->dev);
+		driver_unregister(drv);
+		platform_device_unregister(pd);
+		pd = NULL;
+	}
+	kfree(dreamcastcard);
+	return err;
+
+
+}
+
+
+
+
+static void __exit aica_exit(void)
+{
+	struct device_driver *drv = (&pd->dev)->driver;
+	device_release_driver(&pd->dev);
+	driver_unregister(drv);
+	platform_device_unregister(pd);
+	/* Kill any sound still playing and reset ARM7 to safe state */
+	spu_init();
+
+
+	return;
+}
+
+
+module_init(aica_init);
+module_exit(aica_exit);
diff -ruN --exclude=acore --exclude='.#*' ./sh/aica.h /home/adrian/alsa-driver/sh/aica.h
--- ./sh/aica.h	1970-01-01 01:00:00.000000000 +0100
+++ /home/adrian/alsa-driver/sh/aica.h	2006-04-15 16:48:01.000000000 +0100
@@ -0,0 +1,83 @@
+/* aica.h
+ * Header file for ALSA driver for
+ * Sega Dreamcast Yamaha AICA sound
+ * Copyright Adrian McMenamin
+ * <adrian@mcmen.demon.co.uk>
+ * 2006
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/* SPU memory and register constants etc */
+#define G2_FIFO 0xa05f688c
+#define SPU_MEMORY_BASE 0xA0800000
+#define ARM_RESET_REGISTER 0xA0702C00
+#define SPU_REGISTER_BASE 0xA0700000
+
+
+
+/* AICA channels stuff */
+
+#define AICA_CONTROL_POINT 0xA0810000
+#define AICA_CONTROL_CHANNEL_SAMPLE_NUMBER 0xA0810008
+#define AICA_CHANNEL0_CONTROL_OFFSET 0x10004
+
+/* Command values */
+#define AICA_CMD_KICK 0x80000000
+#define AICA_CMD_NONE 0
+#define AICA_CMD_START 1
+#define AICA_CMD_STOP 2
+#define AICA_CMD_VOL 3
+
+/* Sound modes */
+#define SM_8BIT		1
+#define SM_16BIT	0
+#define SM_ADPCM	2
+
+/* Buffer and period size */
+#define AICA_BUFFER_SIZE 0x8000
+#define AICA_PERIOD_SIZE 0x800
+#define AICA_PERIOD_NUMBER 16
+
+#define AICA_CHANNEL0_OFFSET 0x11000
+#define AICA_CHANNEL1_OFFSET 0x21000
+
+
+
+
+struct aica_channel {
+	uint32_t cmd;		/* Command ID           */
+	uint32_t pos;		/* Sample position      */
+	uint32_t length;	/* Sample length        */
+	uint32_t freq;		/* Frequency            */
+	uint32_t vol;		/* Volume 0-255         */
+	uint32_t pan;		/* Pan 0-255            */
+	uint32_t sfmt;		/* Sound format         */
+	uint32_t flags;		/* Bit flags            */
+};
+
+
+struct snd_card_aica {
+	struct snd_card *card;
+	struct aica_channel *channel;
+	snd_pcm_substream_t *substream;
+	int clicks;
+	int current_period;
+	struct timer_list timer;
+	int master_volume;
+
+};
+
+
diff -ruN --exclude=acore --exclude='.#*' ./sh/Makefile /home/adrian/alsa-driver/sh/Makefile
--- ./sh/Makefile	1970-01-01 01:00:00.000000000 +0100
+++ /home/adrian/alsa-driver/sh/Makefile	2006-04-14 18:48:02.000000000 +0100
@@ -0,0 +1,11 @@
+ifndef SND_TOPDIR
+SND_TOPDIR=..
+endif
+
+include $(SND_TOPDIR)/toplevel.config
+include $(SND_TOPDIR)/Makefile.conf
+
+snd-aica-objs := aica.o
+obj-$(CONFIG_SND_AICA) += snd-aica.o
+
+include $(SND_TOPDIR)/Rules.make