3 files changed, 709 insertions, 0 deletions

diff --git a/sound/mips/Kconfig b/sound/mips/Kconfig
new file mode 100644
index 000000000000..531f8ba96a71
--- /dev/null
+++ b/sound/mips/Kconfig
@@ -0,0 +1,15 @@
+# ALSA MIPS drivers
+
+menu "ALSA MIPS devices"
+        depends on SND!=n && MIPS
+
+config SND_AU1X00
+        tristate "Au1x00 AC97 Port Driver"
+        depends on (SOC_AU1000 || SOC_AU1100 || SOC_AU1500) && SND
+        select SND_PCM
+        select SND_AC97_CODEC
+        help
+          ALSA Sound driver for the Au1x00's AC97 port.
+
+endmenu
+
diff --git a/sound/mips/Makefile b/sound/mips/Makefile
new file mode 100644
index 000000000000..47afed971fba
--- /dev/null
+++ b/sound/mips/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for ALSA
+#
+
+snd-au1x00-objs := au1x00.o
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_AU1X00) += snd-au1x00.o
diff --git a/sound/mips/au1x00.c b/sound/mips/au1x00.c
new file mode 100644
index 000000000000..c20522b02134
--- /dev/null
+++ b/sound/mips/au1x00.c
@@ -0,0 +1,686 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ *  Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
+ *
+ * Copyright 2004 Cooper Street Innovations Inc.
+ * Author: Charles Eidsness     <charles@cooper-street.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * History:
+ *
+ * 2004-09-09 Charles Eidsness  -- Original verion -- based on
+ *                                sa11xx-uda1341.c ALSA driver and the
+ *                                au1000.c OSS driver.
+ * 2004-09-09 Matt Porter       -- Added support for ALSA 1.0.6
+ *
+ */
+
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1000_dma.h>
+
+MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
+MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
+MODULE_LICENSE("GPL");
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
+#else
+MODULE_CLASSES("{sound}");
+MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
+#endif
+
+#define chip_t au1000_t
+
+#define PLAYBACK 0
+#define CAPTURE 1
+#define AC97_SLOT_3 0x01
+#define AC97_SLOT_4 0x02
+#define AC97_SLOT_6 0x08
+#define AC97_CMD_IRQ 31
+#define READ 0
+#define WRITE 1
+#define READ_WAIT 2
+#define RW_DONE 3
+
+DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
+
+typedef struct au1000_period au1000_period_t;
+struct au1000_period
+{
+        u32 start;
+        u32 relative_end;       /*realtive to start of buffer*/
+        au1000_period_t * next;
+};
+
+/*Au1000 AC97 Port Control Reisters*/
+typedef struct au1000_ac97_reg au1000_ac97_reg_t;
+struct au1000_ac97_reg {
+        u32 volatile config;
+        u32 volatile status;
+        u32 volatile data;
+        u32 volatile cmd;
+        u32 volatile cntrl;
+};
+
+typedef struct audio_stream audio_stream_t;
+struct audio_stream {
+        snd_pcm_substream_t * substream;
+        int dma;
+        spinlock_t dma_lock;
+        au1000_period_t * buffer;
+        unsigned long period_size;
+};
+
+typedef struct snd_card_au1000 {
+        snd_card_t *card;
+        au1000_ac97_reg_t volatile *ac97_ioport;
+
+        struct resource *ac97_res_port;
+        spinlock_t ac97_lock;
+        ac97_t *ac97;
+
+        snd_pcm_t *pcm;
+        audio_stream_t *stream[2];      /* playback & capture */
+} au1000_t;
+
+static au1000_t *au1000 = NULL;
+
+/*--------------------------- Local Functions --------------------------------*/
+static void
+au1000_set_ac97_xmit_slots(long xmit_slots)
+{
+        u32 volatile ac97_config;
+
+        spin_lock(&au1000->ac97_lock);
+        ac97_config = au1000->ac97_ioport->config;
+        ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
+        ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
+        au1000->ac97_ioport->config = ac97_config;
+        spin_unlock(&au1000->ac97_lock);
+}
+
+static void
+au1000_set_ac97_recv_slots(long recv_slots)
+{
+        u32 volatile ac97_config;
+
+        spin_lock(&au1000->ac97_lock);
+        ac97_config = au1000->ac97_ioport->config;
+        ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
+        ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
+        au1000->ac97_ioport->config = ac97_config;
+        spin_unlock(&au1000->ac97_lock);
+}
+
+
+static void
+au1000_dma_stop(audio_stream_t *stream)
+{
+        unsigned long   flags;
+        au1000_period_t * pointer;
+        au1000_period_t * pointer_next;
+
+        if (stream->buffer != NULL) {
+                spin_lock_irqsave(&stream->dma_lock, flags);
+                disable_dma(stream->dma);
+                spin_unlock_irqrestore(&stream->dma_lock, flags);
+
+                pointer = stream->buffer;
+                pointer_next = stream->buffer->next;
+
+                do {
+                        kfree(pointer);
+                        pointer = pointer_next;
+                        pointer_next = pointer->next;
+                } while (pointer != stream->buffer);
+
+                stream->buffer = NULL;
+        }
+}
+
+static void
+au1000_dma_start(audio_stream_t *stream)
+{
+        snd_pcm_substream_t *substream = stream->substream;
+        snd_pcm_runtime_t *runtime = substream->runtime;
+
+        unsigned long flags, dma_start;
+        int i;
+        au1000_period_t * pointer;
+
+        if (stream->buffer == NULL) {
+                dma_start = virt_to_phys(runtime->dma_area);
+
+                stream->period_size = frames_to_bytes(runtime,
+                        runtime->period_size);
+                stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
+                pointer = stream->buffer;
+                for (i = 0 ; i < runtime->periods ; i++) {
+                        pointer->start = (u32)(dma_start +
+                                (i * stream->period_size));
+                        pointer->relative_end = (u32)
+                                (((i+1) * stream->period_size) - 0x1);
+                        if ( i < runtime->periods - 1) {
+                                pointer->next = kmalloc(sizeof(au1000_period_t)
+                                        , GFP_KERNEL);
+                                pointer = pointer->next;
+                        }
+                }
+                pointer->next = stream->buffer;
+
+                spin_lock_irqsave(&stream->dma_lock, flags);
+                init_dma(stream->dma);
+                if (get_dma_active_buffer(stream->dma) == 0) {
+                        clear_dma_done0(stream->dma);
+                        set_dma_addr0(stream->dma, stream->buffer->start);
+                        set_dma_count0(stream->dma, stream->period_size >> 1);
+                        set_dma_addr1(stream->dma, stream->buffer->next->start);
+                        set_dma_count1(stream->dma, stream->period_size >> 1);
+                } else {
+                        clear_dma_done1(stream->dma);
+                        set_dma_addr1(stream->dma, stream->buffer->start);
+                        set_dma_count1(stream->dma, stream->period_size >> 1);
+                        set_dma_addr0(stream->dma, stream->buffer->next->start);
+                        set_dma_count0(stream->dma, stream->period_size >> 1);
+                }
+                enable_dma_buffers(stream->dma);
+                start_dma(stream->dma);
+                spin_unlock_irqrestore(&stream->dma_lock, flags);
+        }
+}
+
+static irqreturn_t
+au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        audio_stream_t *stream = (audio_stream_t *) dev_id;
+        snd_pcm_substream_t *substream = stream->substream;
+
+        spin_lock(&stream->dma_lock);
+        switch (get_dma_buffer_done(stream->dma)) {
+        case DMA_D0:
+                stream->buffer = stream->buffer->next;
+                clear_dma_done0(stream->dma);
+                set_dma_addr0(stream->dma, stream->buffer->next->start);
+                set_dma_count0(stream->dma, stream->period_size >> 1);
+                enable_dma_buffer0(stream->dma);
+                break;
+        case DMA_D1:
+                stream->buffer = stream->buffer->next;
+                clear_dma_done1(stream->dma);
+                set_dma_addr1(stream->dma, stream->buffer->next->start);
+                set_dma_count1(stream->dma, stream->period_size >> 1);
+                enable_dma_buffer1(stream->dma);
+                break;
+        case (DMA_D0 | DMA_D1):
+                spin_unlock(&stream->dma_lock);
+                printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
+                au1000_dma_stop(stream);
+                au1000_dma_start(stream);
+                spin_lock(&stream->dma_lock);
+                break;
+        case (~DMA_D0 & ~DMA_D1):
+                printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
+        }
+        spin_unlock(&stream->dma_lock);
+        snd_pcm_period_elapsed(substream);
+        return IRQ_HANDLED;
+}
+
+/*-------------------------- PCM Audio Streams -------------------------------*/
+
+static unsigned int rates[] = {8000, 11025, 16000, 22050};
+static snd_pcm_hw_constraint_list_t hw_constraints_rates = {
+        .count  =  sizeof(rates) / sizeof(rates[0]),
+        .list   = rates,
+        .mask   = 0,
+};
+
+static snd_pcm_hardware_t snd_au1000 =
+{
+        .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
+                                SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
+                                SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
+        .rate_min               = 8000,
+        .rate_max               = 22050,
+        .channels_min           = 1,
+        .channels_max           = 2,
+        .buffer_bytes_max       = 128*1024,
+        .period_bytes_min       = 32,
+        .period_bytes_max       = 16*1024,
+        .periods_min            = 8,
+        .periods_max            = 255,
+        .fifo_size              = 16,
+};
+
+static int
+snd_au1000_playback_open(snd_pcm_substream_t * substream)
+{
+        au1000->stream[PLAYBACK]->substream = substream;
+        au1000->stream[PLAYBACK]->buffer = NULL;
+        substream->private_data = au1000->stream[PLAYBACK];
+        substream->runtime->hw = snd_au1000;
+        return (snd_pcm_hw_constraint_list(substream->runtime, 0,
+                SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
+}
+
+static int
+snd_au1000_capture_open(snd_pcm_substream_t * substream)
+{
+        au1000->stream[CAPTURE]->substream = substream;
+        au1000->stream[CAPTURE]->buffer = NULL;
+        substream->private_data = au1000->stream[CAPTURE];
+        substream->runtime->hw = snd_au1000;
+        return (snd_pcm_hw_constraint_list(substream->runtime, 0,
+                SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
+
+}
+
+static int
+snd_au1000_playback_close(snd_pcm_substream_t * substream)
+{
+        au1000->stream[PLAYBACK]->substream = NULL;
+        return 0;
+}
+
+static int
+snd_au1000_capture_close(snd_pcm_substream_t * substream)
+{
+        au1000->stream[CAPTURE]->substream = NULL;
+        return 0;
+}
+
+static int
+snd_au1000_hw_params(snd_pcm_substream_t * substream,
+                                        snd_pcm_hw_params_t * hw_params)
+{
+        return snd_pcm_lib_malloc_pages(substream,
+                                        params_buffer_bytes(hw_params));
+}
+
+static int
+snd_au1000_hw_free(snd_pcm_substream_t * substream)
+{
+        return snd_pcm_lib_free_pages(substream);
+}
+
+static int
+snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
+{
+        snd_pcm_runtime_t *runtime = substream->runtime;
+
+        if (runtime->channels == 1 )
+                au1000_set_ac97_xmit_slots(AC97_SLOT_4);
+        else
+                au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
+        snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
+        return 0;
+}
+
+static int
+snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
+{
+        snd_pcm_runtime_t *runtime = substream->runtime;
+
+        if (runtime->channels == 1 )
+                au1000_set_ac97_recv_slots(AC97_SLOT_4);
+        else
+                au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
+        snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
+        return 0;
+}
+
+static int
+snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
+{
+        audio_stream_t *stream = substream->private_data;
+        int err = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                au1000_dma_start(stream);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                au1000_dma_stop(stream);
+                break;
+        default:
+                err = -EINVAL;
+                break;
+        }
+        return err;
+}
+
+static snd_pcm_uframes_t
+snd_au1000_pointer(snd_pcm_substream_t * substream)
+{
+        audio_stream_t *stream = substream->private_data;
+        snd_pcm_runtime_t *runtime = substream->runtime;
+        unsigned long flags;
+        long location;
+
+        spin_lock_irqsave(&stream->dma_lock, flags);
+        location = get_dma_residue(stream->dma);
+        spin_unlock_irqrestore(&stream->dma_lock, flags);
+        location = stream->buffer->relative_end - location;
+        if (location == -1)
+                location = 0;
+        return bytes_to_frames(runtime,location);
+}
+
+static snd_pcm_ops_t snd_card_au1000_playback_ops = {
+        .open                   = snd_au1000_playback_open,
+        .close                  = snd_au1000_playback_close,
+        .ioctl                  = snd_pcm_lib_ioctl,
+        .hw_params              = snd_au1000_hw_params,
+        .hw_free                = snd_au1000_hw_free,
+        .prepare                = snd_au1000_playback_prepare,
+        .trigger                = snd_au1000_trigger,
+        .pointer                = snd_au1000_pointer,
+};
+
+static snd_pcm_ops_t snd_card_au1000_capture_ops = {
+        .open                   = snd_au1000_capture_open,
+        .close                  = snd_au1000_capture_close,
+        .ioctl                  = snd_pcm_lib_ioctl,
+        .hw_params              = snd_au1000_hw_params,
+        .hw_free                = snd_au1000_hw_free,
+        .prepare                = snd_au1000_capture_prepare,
+        .trigger                = snd_au1000_trigger,
+        .pointer                = snd_au1000_pointer,
+};
+
+static int __devinit
+snd_au1000_pcm_new(void)
+{
+        snd_pcm_t *pcm;
+        int err;
+        unsigned long flags;
+
+        if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
+                return err;
+
+        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+                snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
+
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+                &snd_card_au1000_playback_ops);
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+                &snd_card_au1000_capture_ops);
+
+        pcm->private_data = au1000;
+        pcm->info_flags = 0;
+        strcpy(pcm->name, "Au1000 AC97 PCM");
+
+        flags = claim_dma_lock();
+        if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
+                        "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
+                        au1000->stream[PLAYBACK])) < 0) {
+                release_dma_lock(flags);
+                return -EBUSY;
+        }
+        if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
+                        "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
+                        au1000->stream[CAPTURE])) < 0){
+                release_dma_lock(flags);
+                return -EBUSY;
+        }
+        /* enable DMA coherency in read/write DMA channels */
+        set_dma_mode(au1000->stream[PLAYBACK]->dma,
+                     get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
+        set_dma_mode(au1000->stream[CAPTURE]->dma,
+                     get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
+        release_dma_lock(flags);
+        spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
+        spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
+        au1000->pcm = pcm;
+        return 0;
+}
+
+
+/*-------------------------- AC97 CODEC Control ------------------------------*/
+
+static unsigned short
+snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
+{
+        u32 volatile cmd;
+        u16 volatile data;
+        int             i;
+        spin_lock(au1000->ac97_lock);
+/* would rather use the interupt than this polling but it works and I can't
+get the interupt driven case to work efficiently */
+        for (i = 0; i < 0x5000; i++)
+                if (!(au1000->ac97_ioport->status & AC97C_CP))
+                        break;
+        if (i == 0x5000)
+                printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
+
+        cmd = (u32) reg & AC97C_INDEX_MASK;
+        cmd |= AC97C_READ;
+        au1000->ac97_ioport->cmd = cmd;
+
+        /* now wait for the data */
+        for (i = 0; i < 0x5000; i++)
+                if (!(au1000->ac97_ioport->status & AC97C_CP))
+                        break;
+        if (i == 0x5000) {
+                printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
+                return 0;
+        }
+
+        data = au1000->ac97_ioport->cmd & 0xffff;
+        spin_unlock(au1000->ac97_lock);
+
+        return data;
+
+}
+
+
+static void
+snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
+{
+        u32 cmd;
+        int i;
+        spin_lock(au1000->ac97_lock);
+/* would rather use the interupt than this polling but it works and I can't
+get the interupt driven case to work efficiently */
+        for (i = 0; i < 0x5000; i++)
+                if (!(au1000->ac97_ioport->status & AC97C_CP))
+                        break;
+        if (i == 0x5000)
+                printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
+
+        cmd = (u32) reg & AC97C_INDEX_MASK;
+        cmd &= ~AC97C_READ;
+        cmd |= ((u32) val << AC97C_WD_BIT);
+        au1000->ac97_ioport->cmd = cmd;
+        spin_unlock(au1000->ac97_lock);
+}
+static void
+snd_au1000_ac97_free(ac97_t *ac97)
+{
+        au1000->ac97 = NULL;
+}
+
+static int __devinit
+snd_au1000_ac97_new(void)
+{
+        int err;
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+        ac97_bus_t *pbus;
+        ac97_template_t ac97;
+        static ac97_bus_ops_t ops = {
+                .write = snd_au1000_ac97_write,
+                .read = snd_au1000_ac97_read,
+        };
+#else
+        ac97_bus_t bus, *pbus;
+        ac97_t ac97;
+#endif
+
+        if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
+                        sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
+                snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
+                return -EBUSY;
+        }
+        au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
+
+        spin_lock_init(&au1000->ac97_lock);
+
+        spin_lock(&au1000->ac97_lock);
+
+        /* configure pins for AC'97
+        TODO: move to board_setup.c */
+        au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
+
+        /* Initialise Au1000's AC'97 Control Block */
+        au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
+        udelay(10);
+        au1000->ac97_ioport->cntrl = AC97C_CE;
+        udelay(10);
+
+        /* Initialise External CODEC -- cold reset */
+        au1000->ac97_ioport->config = AC97C_RESET;
+        udelay(10);
+        au1000->ac97_ioport->config = 0x0;
+        mdelay(5);
+
+        spin_unlock(&au1000->ac97_lock);
+
+        /* Initialise AC97 middle-layer */
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+        if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
+                return err;
+#else
+        memset(&bus, 0, sizeof(bus));
+        bus.write = snd_au1000_ac97_write;
+        bus.read = snd_au1000_ac97_read;
+        if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
+                return err;
+#endif
+        memset(&ac97, 0, sizeof(ac97));
+        ac97.private_data = au1000;
+        ac97.private_free = snd_au1000_ac97_free;
+        if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
+                return err;
+        return 0;
+
+}
+
+/*------------------------------ Setup / Destroy ----------------------------*/
+
+void
+snd_au1000_free(snd_card_t *card)
+{
+
+        if (au1000->ac97_res_port) {
+                /* put internal AC97 block into reset */
+                au1000->ac97_ioport->cntrl = AC97C_RS;
+                au1000->ac97_ioport = NULL;
+                release_resource(au1000->ac97_res_port);
+                kfree_nocheck(au1000->ac97_res_port);
+        }
+
+        if (au1000->stream[PLAYBACK]->dma >= 0)
+                free_au1000_dma(au1000->stream[PLAYBACK]->dma);
+
+        if (au1000->stream[CAPTURE]->dma >= 0)
+                free_au1000_dma(au1000->stream[CAPTURE]->dma);
+
+        kfree(au1000->stream[PLAYBACK]);
+        au1000->stream[PLAYBACK] = NULL;
+        kfree(au1000->stream[CAPTURE]);
+        au1000->stream[CAPTURE] = NULL;
+        kfree(au1000);
+        au1000 = NULL;
+
+}
+
+static int __init
+au1000_init(void)
+{
+        int err;
+
+        au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
+        if (au1000 == NULL)
+                return -ENOMEM;
+        au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+        if (au1000->stream[PLAYBACK] == NULL)
+                return -ENOMEM;
+        au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+        if (au1000->stream[CAPTURE] == NULL)
+                return -ENOMEM;
+        /* so that snd_au1000_free will work as intended */
+        au1000->stream[PLAYBACK]->dma = -1;
+        au1000->stream[CAPTURE]->dma = -1;
+        au1000->ac97_res_port = NULL;
+
+        au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
+        if (au1000->card == NULL) {
+                snd_au1000_free(au1000->card);
+                return -ENOMEM;
+        }
+
+        au1000->card->private_data = (au1000_t *)au1000;
+        au1000->card->private_free = snd_au1000_free;
+
+        if ((err = snd_au1000_ac97_new()) < 0 ) {
+                snd_card_free(au1000->card);
+                return err;
+        }
+
+        if ((err = snd_au1000_pcm_new()) < 0) {
+                snd_card_free(au1000->card);
+                return err;
+        }
+
+        strcpy(au1000->card->driver, "AMD-Au1000-AC97");
+        strcpy(au1000->card->shortname, "Au1000-AC97");
+        sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
+
+        if ((err = snd_card_register(au1000->card)) < 0) {
+                snd_card_free(au1000->card);
+                return err;
+        }
+
+        printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
+        return 0;
+}
+
+static void __exit au1000_exit(void)
+{
+        snd_card_free(au1000->card);
+}
+
+module_init(au1000_init);
+module_exit(au1000_exit);
+