(This is a cleaned-up version following comments - please commit)
ALSA support for the SEGA Dreamcast Yamaha AICA sound device (pcm)
This patch adds ALSA sound support for pcm playback on two channels on
the SEGA Dreamcast built-in sound device (the Yamaha AICA)
Add driver for the AICA sound device built into the SEGA Dreamcast
Hook it all up with the build system.
Signed-off-by: Adrian McMenamin <[email protected]>
diff -Naur ./linux-2.6.21-orig/sound/Kconfig ./linux-2.6.21/sound/Kconfig
--- ./linux-2.6.21-orig/sound/Kconfig 2007-04-26 04:08:32.000000000 +0100
+++ ./linux-2.6.21/sound/Kconfig 2007-05-07 21:20:54.000000000 +0100
@@ -64,6 +64,8 @@
source "sound/mips/Kconfig"
+source "sound/sh/Kconfig"
+
# the following will depend on the order of config.
# here assuming USB is defined before ALSA
source "sound/usb/Kconfig"
diff -Naur ./linux-2.6.21-orig/sound/Makefile ./linux-2.6.21/sound/Makefile
--- ./linux-2.6.21-orig/sound/Makefile 2007-04-26 04:08:32.000000000 +0100
+++ ./linux-2.6.21/sound/Makefile 2007-05-07 21:37:05.000000000 +0100
@@ -5,7 +5,7 @@
obj-$(CONFIG_SOUND_PRIME) += sound_firmware.o
obj-$(CONFIG_SOUND_PRIME) += oss/
obj-$(CONFIG_DMASOUND) += oss/
-obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ synth/ usb/ sparc/ parisc/ pcmcia/ mips/ soc/
+obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ sh/ synth/ usb/ sparc/ parisc/ pcmcia/ mips/ soc/
obj-$(CONFIG_SND_AOA) += aoa/
# This one must be compilable even if sound is configured out
diff -Naur ./linux-2.6.21-orig/sound/sh/aica.c ./linux-2.6.21/sound/sh/aica.c
--- ./linux-2.6.21-orig/sound/sh/aica.c 1970-01-01 01:00:00.000000000 +0100
+++ ./linux-2.6.21/sound/sh/aica.c 2007-05-14 23:11:35.000000000 +0100
@@ -0,0 +1,672 @@
+/*
+* This code is licenced under
+* the General Public Licence
+* version 2
+*
+* Copyright Adrian McMenamin 2005, 2006, 2007
+* <[email protected]>
+* Requires firmware (BSD licenced) available from:
+* http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
+* or the maintainer
+*
+* 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 <linux/workqueue.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 <asm/io.h>
+#include <asm/dma.h>
+#include <asm/dreamcast/sysasic.h>
+#include "aica.h"
+
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+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 = -1;
+static char *id;
+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.");
+
+/* Use workqueue */
+
+static struct spu_work_holder {
+ struct work_struct spu_dma_work;
+ void *sspointer;
+} spu_working;
+
+static struct workqueue_struct *aica_queue;
+
+/* Simple platform device */
+static struct platform_device *pd;
+static struct resource aica_memory_space[2] = {
+ {
+ .name = "AICA ARM CONTROL",
+ .start = ARM_RESET_REGISTER,
+ .flags = IORESOURCE_MEM,
+ .end = ARM_RESET_REGISTER + 3,
+ },
+ {
+ .name = "AICA Sound RAM",
+ .start = SPU_MEMORY_BASE,
+ .flags = IORESOURCE_MEM,
+ .end = SPU_MEMORY_BASE + 0x200000 - 1,
+ },
+};
+
+/* SPU specific functions */
+/* spu_write_wait - wait for G2-SH FIFO to clear */
+static 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;
+ }
+}
+
+/* spu_memset - write to memory in SPU address space */
+static void spu_memset(u32 toi, u32 what, int length)
+{
+ int i;
+ snd_assert(length % 4 == 0, return);
+ spu_write_wait();
+ for (i = 0; i < length; i++) {
+ writel(what, toi + SPU_MEMORY_BASE);
+ toi++;
+ if (i && !(i % 8))
+ spu_write_wait();
+ }
+}
+
+/* spu_memload - write to SPU address space */
+static void spu_memload(u32 toi, void __iomem * from, int length)
+{
+ u32 __iomem *froml = from;
+ u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
+ int i, val;
+ length = DIV_ROUND_UP(length, 4);
+ spu_write_wait();
+ for (i = 0; i < length; i++) {
+ val = *froml;
+ writel(val, to);
+ froml++;
+ to++;
+ if (i && !(i % 8))
+ spu_write_wait();
+ }
+}
+
+/* spu_disable - set spu registers to stop sound output */
+static void spu_disable(void)
+{
+ int i;
+ u32 regval;
+ spu_write_wait();
+ regval = readl(ARM_RESET_REGISTER);
+ regval |= 1;
+ spu_write_wait();
+ writel(regval, ARM_RESET_REGISTER);
+ for (i = 0; i < 64; i++) {
+ spu_write_wait();
+ regval = readl(SPU_REGISTER_BASE + (i * 0x80));
+ regval = (regval & ~0x4000) | 0x8000;
+ spu_write_wait();
+ writel(regval, SPU_REGISTER_BASE + (i * 0x80));
+ }
+}
+
+/* spu_enable - set spu registers to enable sound output */
+static void spu_enable(void)
+{
+ u32 regval = readl(ARM_RESET_REGISTER);
+ regval &= ~1;
+ spu_write_wait();
+ writel(regval, ARM_RESET_REGISTER);
+}
+
+/*
+ * Halt the sound processor, clear the memory,
+ * load some default ARM7 code, and then restart ARM7
+*/
+static void spu_reset(void)
+{
+ spu_disable();
+ spu_memset(0, 0, 0x200000 / 4);
+ /* Put ARM7 in endless loop */
+ ctrl_outl(0xea000002, SPU_MEMORY_BASE);
+ spu_enable();
+}
+
+/* aica_chn_start - write to spu to start playback */
+static void aica_chn_start(void)
+{
+ spu_write_wait();
+ writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
+}
+
+/* aica_chn_halt - write to spu to halt playback */
+static void aica_chn_halt(void)
+{
+ spu_write_wait();
+ writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
+}
+
+/* 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,
+};
+
+static int aica_dma_transfer(int channels, int buffer_size,
+ struct snd_pcm_substream *substream)
+{
+ int q, err, period_offset;
+ struct snd_card_aica *dreamcastcard;
+ struct snd_pcm_runtime *runtime;
+ err = 0;
+ dreamcastcard = substream->pcm->private_data;
+ period_offset = dreamcastcard->clicks;
+ period_offset %= (AICA_PERIOD_NUMBER / channels);
+ runtime = substream->runtime;
+ for (q = 0; q < channels; q++) {
+ err = dma_xfer(AICA_DMA_CHANNEL,
+ (unsigned long)(runtime->dma_area +
+ (AICA_BUFFER_SIZE * q) /
+ channels +
+ AICA_PERIOD_SIZE *
+ period_offset),
+ AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
+ AICA_PERIOD_SIZE * period_offset,
+ buffer_size / channels, AICA_DMA_MODE);
+ if (unlikely(err < 0))
+ break;
+ dma_wait_for_completion(AICA_DMA_CHANNEL);
+ }
+ return err;
+}
+
+static void startup_aica(struct snd_card_aica *dreamcastcard)
+{
+ spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
+ (u8 *) dreamcastcard->channel,
+ sizeof(struct aica_channel));
+ aica_chn_start();
+}
+
+static void run_spu_dma(struct work_struct *work)
+{
+ int buffer_size;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ struct snd_card_aica *dreamcastcard;
+ struct spu_work_holder *holder = container_of(work, struct spu_work_holder, spu_dma_work);
+ substream = holder-> sspointer;
+ dreamcastcard = substream->pcm->private_data;
+ runtime = substream->runtime;
+ if (unlikely(dreamcastcard->dma_check == 0)) {
+ buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
+ if (runtime->channels > 1)
+ dreamcastcard->channel->flags |= 0x01;
+ aica_dma_transfer(runtime->channels, buffer_size, substream);
+ startup_aica(dreamcastcard);
+ dreamcastcard->clicks =
+ buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
+ return;
+ } else {
+ aica_dma_transfer(runtime->channels,
+ AICA_PERIOD_SIZE * runtime->channels,
+ substream);
+ snd_pcm_period_elapsed(dreamcastcard->substream);
+ dreamcastcard->clicks++;
+ if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
+ {
+ dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
+ }
+ mod_timer(&dreamcastcard->timer, jiffies + 1);
+ }
+}
+
+static void aica_period_elapsed(unsigned long timer_var)
+{
+ /*timer function - so cannot sleep */
+ 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 = 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) {
+ /* reschedule the timer */
+ mod_timer(&(dreamcastcard->timer), jiffies + 1);
+ return;
+ }
+ if (runtime->channels > 1)
+ dreamcastcard->current_period = play_period;
+ if (unlikely(dreamcastcard->dma_check == 0))
+ dreamcastcard->dma_check = 1;
+ queue_work(aica_queue, &(spu_working.spu_dma_work));
+}
+
+static void spu_begin_dma(struct snd_pcm_substream *substream)
+{
+ /* Must be atomic */
+ struct snd_card_aica *dreamcastcard;
+ struct snd_pcm_runtime *runtime;
+ runtime = substream->runtime;
+ dreamcastcard = substream->pcm->private_data;
+ /* Use queue to do the heavy lifting */
+ spu_working.sspointer = substream;
+ INIT_WORK(&(spu_working.spu_dma_work), run_spu_dma);
+ queue_work(aica_queue, &(spu_working.spu_dma_work));
+ /* Timer may already be running */
+ if (unlikely(dreamcastcard->timer.data)) {
+ mod_timer(&dreamcastcard->timer, jiffies + 4);
+ return;
+ }
+ 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));
+}
+
+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 = 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;
+ dreamcastcard->dma_check = 0;
+ return 0;
+}
+
+static int snd_aicapcm_pcm_close(struct snd_pcm_substream
+ *substream)
+{
+ struct snd_card_aica *dreamcastcard = 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 = substream->pcm->private_data;
+ 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 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 = 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,
+};
+
+/* 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;
+ /* AICA has no capture ability */
+ err =
+ snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, &pcm);
+ if (unlikely(err < 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 = kcontrol->private_data;
+ if (unlikely(!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 = kcontrol->private_data;
+ if (unlikely(!dreamcastcard->channel))
+ return -ETXTBSY;
+ if (unlikely(dreamcastcard->channel->vol ==
+ ucontrol->value.integer.value[0]))
+ return 0;
+ dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
+ dreamcastcard->master_volume = ucontrol->value.integer.value[0];
+ spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
+ (u8 *) 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,
+ .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,
+ .info = aica_pcmvolume_info,
+ .get = aica_pcmvolume_get,
+ .put = aica_pcmvolume_put
+};
+
+static int load_aica_firmware(void)
+{
+ int err;
+ const struct firmware *fw_entry;
+ spu_reset();
+ err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
+ if (unlikely(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 (unlikely(err < 0))
+ return err;
+ err = snd_ctl_add
+ (dreamcastcard->card,
+ snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
+ if (unlikely(err < 0))
+ return err;
+ return 0;
+}
+
+static int snd_aica_remove(struct platform_device *devptr)
+{
+ struct snd_card_aica *dreamcastcard;
+ dreamcastcard = platform_get_drvdata(devptr);
+ if (unlikely(!dreamcastcard))
+ return -ENODEV;
+ snd_card_free(dreamcastcard->card);
+ kfree(dreamcastcard);
+ platform_set_drvdata(devptr, NULL);
+ return 0;
+}
+
+static int __init snd_aica_probe(struct platform_device *devptr)
+{
+ int err;
+ struct snd_card_aica *dreamcastcard;
+ dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
+ if (unlikely(!dreamcastcard))
+ return -ENOMEM;
+ dreamcastcard->card =
+ snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
+ if (unlikely(!dreamcastcard->card)) {
+ kfree(dreamcastcard);
+ return -ENODEV;
+ }
+ strcpy(dreamcastcard->card->driver, "snd_aica");
+ strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
+ strcpy(dreamcastcard->card->longname,
+ "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
+ /* Load the PCM 'chip' */
+ err = snd_aicapcmchip(dreamcastcard, 0);
+ if (unlikely(err < 0))
+ goto freedreamcast;
+ snd_card_set_dev(dreamcastcard->card, &devptr->dev);
+ dreamcastcard->timer.data = 0;
+ dreamcastcard->channel = NULL;
+ /* Add basic controls */
+ err = add_aicamixer_controls(dreamcastcard);
+ if (unlikely(err < 0))
+ goto freedreamcast;
+ /* Register the card with ALSA subsystem */
+ err = snd_card_register(dreamcastcard->card);
+ if (unlikely(err < 0))
+ goto freedreamcast;
+ platform_set_drvdata(devptr, dreamcastcard);
+ aica_queue = create_workqueue(CARD_NAME);
+ if (unlikely(!aica_queue))
+ goto freedreamcast;
+ snd_printk
+ ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
+ return 0;
+ freedreamcast:
+ snd_card_free(dreamcastcard->card);
+ kfree(dreamcastcard);
+ return err;
+}
+
+static struct platform_driver snd_aica_driver = {
+ .probe = snd_aica_probe,
+ .remove = snd_aica_remove,
+ .driver = {
+ .name = SND_AICA_DRIVER},
+};
+
+static int __init aica_init(void)
+{
+ int err;
+ err = platform_driver_register(&snd_aica_driver);
+ if (unlikely(err < 0))
+ return err;
+ pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
+ aica_memory_space, 2);
+ if (unlikely(IS_ERR(pd))) {
+ platform_driver_unregister(&snd_aica_driver);
+ return PTR_ERR(pd);
+ }
+ /* Load the firmware */
+ return load_aica_firmware();
+}
+
+static void __exit aica_exit(void)
+{
+ /* Destroy the aica kernel thread */
+ destroy_workqueue(aica_queue);
+ platform_device_unregister(pd);
+ platform_driver_unregister(&snd_aica_driver);
+ /* Kill any sound still playing and reset ARM7 to safe state */
+ spu_reset();
+}
+
+module_init(aica_init);
+module_exit(aica_exit);
diff -Naur ./linux-2.6.21-orig/sound/sh/aica.h ./linux-2.6.21/sound/sh/aica.h
--- ./linux-2.6.21-orig/sound/sh/aica.h 1970-01-01 01:00:00.000000000 +0100
+++ ./linux-2.6.21/sound/sh/aica.h 2007-05-07 21:47:31.000000000 +0100
@@ -0,0 +1,80 @@
+/* aica.h
+ * Header file for ALSA driver for
+ * Sega Dreamcast Yamaha AICA sound
+ * Copyright Adrian McMenamin
+ * <[email protected]>
+ * 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
+#define CHANNEL_OFFSET 0x10000
+
+#define AICA_DMA_CHANNEL 0
+#define AICA_DMA_MODE 5
+
+#define SND_AICA_DRIVER "AICA"
+
+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;
+ struct snd_pcm_substream *substream;
+ int clicks;
+ int current_period;
+ struct timer_list timer;
+ int master_volume;
+ int dma_check;
+};
diff -Naur ./linux-2.6.21-orig/sound/sh/Kconfig ./linux-2.6.21/sound/sh/Kconfig
--- ./linux-2.6.21-orig/sound/sh/Kconfig 1970-01-01 01:00:00.000000000 +0100
+++ ./linux-2.6.21/sound/sh/Kconfig 2007-05-07 21:28:30.000000000 +0100
@@ -0,0 +1,14 @@
+# ALSA SH drivers
+
+menu "SUPERH devices"
+ depends on SND!=n && SUPERH
+
+config SND_AICA
+ tristate "Dreamcast Yamaha AICA sound"
+ depends on SH_DREAMCAST && SND
+ select SND_PCM
+ help
+ ALSA Sound driver for the SEGA Dreamcast console.
+
+endmenu
+
diff -Naur ./linux-2.6.21-orig/sound/sh/Makefile ./linux-2.6.21/sound/sh/Makefile
--- ./linux-2.6.21-orig/sound/sh/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ ./linux-2.6.21/sound/sh/Makefile 2007-05-07 21:34:10.000000000 +0100
@@ -0,0 +1,8 @@
+#
+# Makefile for ALSA
+#
+
+snd-aica-objs := aica.o
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_AICA) += snd-aica.o
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