[ALSA] Add ASoC drivers for the Freescale MPC8610 SoC

Add the ASoC drivers for the Freescale MPC8610 SoC and the MPC8610 HPCD
reference board.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 631 insertions, 0 deletions

diff --git a/sound/soc/fsl/mpc8610_hpcd.c b/sound/soc/fsl/mpc8610_hpcd.c
new file mode 100644
index 000000000000..f26c4b2e8b6e
--- /dev/null
+++ b/sound/soc/fsl/mpc8610_hpcd.c
@@ -0,0 +1,631 @@
+/**
+ * Freescale MPC8610HPCD ALSA SoC Fabric driver
+ *
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * Copyright 2007-2008 Freescale Semiconductor, Inc.  This file is licensed
+ * under the terms of the GNU General Public License version 2.  This
+ * program is licensed "as is" without any warranty of any kind, whether
+ * express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <sound/soc.h>
+#include <asm/immap_86xx.h>
+
+#include "../codecs/cs4270.h"
+#include "fsl_dma.h"
+#include "fsl_ssi.h"
+
+/**
+ * mpc8610_hpcd_data: fabric-specific ASoC device data
+ *
+ * This structure contains data for a single sound platform device on an
+ * MPC8610 HPCD.  Some of the data is taken from the device tree.
+ */
+struct mpc8610_hpcd_data {
+        struct snd_soc_device sound_devdata;
+        struct snd_soc_dai_link dai;
+        struct snd_soc_machine machine;
+        unsigned int dai_format;
+        unsigned int codec_clk_direction;
+        unsigned int cpu_clk_direction;
+        unsigned int clk_frequency;
+        struct ccsr_guts __iomem *guts;
+        struct ccsr_ssi __iomem *ssi;
+        unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
+        unsigned int ssi_irq;
+        unsigned int dma_id;            /* 0 = DMA1, 1 = DMA2, etc */
+        unsigned int dma_irq[2];
+        struct ccsr_dma_channel __iomem *dma[2];
+        unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
+};
+
+/**
+ * mpc8610_hpcd_machine_probe: initalize the board
+ *
+ * This function is called when platform_device_add() is called.  It is used
+ * to initialize the board-specific hardware.
+ *
+ * Here we program the DMACR and PMUXCR registers.
+ */
+static int mpc8610_hpcd_machine_probe(struct platform_device *sound_device)
+{
+        struct mpc8610_hpcd_data *machine_data =
+                sound_device->dev.platform_data;
+
+        /* Program the signal routing between the SSI and the DMA */
+        guts_set_dmacr(machine_data->guts, machine_data->dma_id + 1,
+                machine_data->dma_channel_id[0], CCSR_GUTS_DMACR_DEV_SSI);
+        guts_set_dmacr(machine_data->guts, machine_data->dma_id + 1,
+                machine_data->dma_channel_id[1], CCSR_GUTS_DMACR_DEV_SSI);
+
+        guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
+                machine_data->dma_channel_id[0], 0);
+        guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
+                machine_data->dma_channel_id[1], 0);
+
+        guts_set_pmuxcr_dma(machine_data->guts, 1, 0, 0);
+        guts_set_pmuxcr_dma(machine_data->guts, 1, 3, 0);
+        guts_set_pmuxcr_dma(machine_data->guts, 0, 3, 0);
+
+        switch (machine_data->ssi_id) {
+        case 0:
+                clrsetbits_be32(&machine_data->guts->pmuxcr,
+                        CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
+                break;
+        case 1:
+                clrsetbits_be32(&machine_data->guts->pmuxcr,
+                        CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
+                break;
+        }
+
+        return 0;
+}
+
+/**
+ * mpc8610_hpcd_startup: program the board with various hardware parameters
+ *
+ * This function takes board-specific information, like clock frequencies
+ * and serial data formats, and passes that information to the codec and
+ * transport drivers.
+ */
+static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+        struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+        struct mpc8610_hpcd_data *machine_data =
+                rtd->socdev->dev->platform_data;
+        int ret = 0;
+
+        /* Tell the CPU driver what the serial protocol is. */
+        if (cpu_dai->dai_ops.set_fmt) {
+                ret = cpu_dai->dai_ops.set_fmt(cpu_dai,
+                        machine_data->dai_format);
+                if (ret < 0) {
+                        dev_err(substream->pcm->card->dev,
+                                "could not set CPU driver audio format\n");
+                        return ret;
+                }
+        }
+
+        /* Tell the codec driver what the serial protocol is. */
+        if (codec_dai->dai_ops.set_fmt) {
+                ret = codec_dai->dai_ops.set_fmt(codec_dai,
+                        machine_data->dai_format);
+                if (ret < 0) {
+                        dev_err(substream->pcm->card->dev,
+                                "could not set codec driver audio format\n");
+                        return ret;
+                }
+        }
+
+        /*
+         * Tell the CPU driver what the clock frequency is, and whether it's a
+         * slave or master.
+         */
+        if (cpu_dai->dai_ops.set_sysclk) {
+                ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, 0,
+                        machine_data->clk_frequency,
+                        machine_data->cpu_clk_direction);
+                if (ret < 0) {
+                        dev_err(substream->pcm->card->dev,
+                                "could not set CPU driver clock parameters\n");
+                        return ret;
+                }
+        }
+
+        /*
+         * Tell the codec driver what the MCLK frequency is, and whether it's
+         * a slave or master.
+         */
+        if (codec_dai->dai_ops.set_sysclk) {
+                ret = codec_dai->dai_ops.set_sysclk(codec_dai, 0,
+                        machine_data->clk_frequency,
+                        machine_data->codec_clk_direction);
+                if (ret < 0) {
+                        dev_err(substream->pcm->card->dev,
+                                "could not set codec driver clock params\n");
+                        return ret;
+                }
+        }
+
+        return 0;
+}
+
+/**
+ * mpc8610_hpcd_machine_remove: Remove the sound device
+ *
+ * This function is called to remove the sound device for one SSI.  We
+ * de-program the DMACR and PMUXCR register.
+ */
+int mpc8610_hpcd_machine_remove(struct platform_device *sound_device)
+{
+        struct mpc8610_hpcd_data *machine_data =
+                sound_device->dev.platform_data;
+
+        /* Restore the signal routing */
+
+        guts_set_dmacr(machine_data->guts, machine_data->dma_id + 1,
+                machine_data->dma_channel_id[0], 0);
+        guts_set_dmacr(machine_data->guts, machine_data->dma_id + 1,
+                machine_data->dma_channel_id[1], 0);
+
+        switch (machine_data->ssi_id) {
+        case 0:
+                clrsetbits_be32(&machine_data->guts->pmuxcr,
+                        CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
+                break;
+        case 1:
+                clrsetbits_be32(&machine_data->guts->pmuxcr,
+                        CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
+                break;
+        }
+
+        return 0;
+}
+
+/**
+ * mpc8610_hpcd_ops: ASoC fabric driver operations
+ */
+static struct snd_soc_ops mpc8610_hpcd_ops = {
+        .startup = mpc8610_hpcd_startup,
+};
+
+/**
+ * mpc8610_hpcd_machine: ASoC machine data
+ */
+static struct snd_soc_machine mpc8610_hpcd_machine = {
+        .probe = mpc8610_hpcd_machine_probe,
+        .remove = mpc8610_hpcd_machine_remove,
+        .name = "MPC8610 HPCD",
+        .num_links = 1,
+};
+
+/**
+ * mpc8610_hpcd_probe: OF probe function for the fabric driver
+ *
+ * This function gets called when an SSI node is found in the device tree.
+ *
+ * Although this is a fabric driver, the SSI node is the "master" node with
+ * respect to audio hardware connections.  Therefore, we create a new ASoC
+ * device for each new SSI node that has a codec attached.
+ *
+ * FIXME: Currently, we only support one DMA controller, so if there are
+ * multiple SSI nodes with codecs, only the first will be supported.
+ *
+ * FIXME: Even if we did support multiple DMA controllers, we have no
+ * mechanism for assigning DMA controllers and channels to the individual
+ * SSI devices.  We also probably aren't compatible with the generic Elo DMA
+ * device driver.
+ */
+static int mpc8610_hpcd_probe(struct of_device *ofdev,
+        const struct of_device_id *match)
+{
+        struct device_node *np = ofdev->node;
+        struct device_node *codec_np = NULL;
+        struct device_node *guts_np = NULL;
+        struct device_node *dma_np = NULL;
+        struct device_node *dma_channel_np = NULL;
+        const phandle *codec_ph;
+        const char *sprop;
+        const u32 *iprop;
+        struct resource res;
+        struct platform_device *sound_device = NULL;
+        struct mpc8610_hpcd_data *machine_data;
+        struct fsl_ssi_info ssi_info;
+        struct fsl_dma_info dma_info;
+        int ret = -ENODEV;
+
+        machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
+        if (!machine_data)
+                return -ENOMEM;
+
+        memset(&ssi_info, 0, sizeof(ssi_info));
+        memset(&dma_info, 0, sizeof(dma_info));
+
+        ssi_info.dev = &ofdev->dev;
+
+        /*
+         * We are only interested in SSIs with a codec phandle in them, so let's
+         * make sure this SSI has one.
+         */
+        codec_ph = of_get_property(np, "codec-handle", NULL);
+        if (!codec_ph)
+                goto error;
+
+        codec_np = of_find_node_by_phandle(*codec_ph);
+        if (!codec_np)
+                goto error;
+
+        /* The MPC8610 HPCD only knows about the CS4270 codec, so reject
+           anything else. */
+        if (!of_device_is_compatible(codec_np, "cirrus,cs4270"))
+                goto error;
+
+        /* Get the device ID */
+        iprop = of_get_property(np, "cell-index", NULL);
+        if (!iprop) {
+                dev_err(&ofdev->dev, "cell-index property not found\n");
+                ret = -EINVAL;
+                goto error;
+        }
+        machine_data->ssi_id = *iprop;
+        ssi_info.id = *iprop;
+
+        /* Get the serial format and clock direction. */
+        sprop = of_get_property(np, "fsl,mode", NULL);
+        if (!sprop) {
+                dev_err(&ofdev->dev, "fsl,mode property not found\n");
+                ret = -EINVAL;
+                goto error;
+        }
+
+        if (strcasecmp(sprop, "i2s-slave") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_I2S;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
+
+                /*
+                 * In i2s-slave mode, the codec has its own clock source, so we
+                 * need to get the frequency from the device tree and pass it to
+                 * the codec driver.
+                 */
+                iprop = of_get_property(codec_np, "clock-frequency", NULL);
+                if (!iprop || !*iprop) {
+                        dev_err(&ofdev->dev, "codec bus-frequency property "
+                                "is missing or invalid\n");
+                        ret = -EINVAL;
+                        goto error;
+                }
+                machine_data->clk_frequency = *iprop;
+        } else if (strcasecmp(sprop, "i2s-master") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_I2S;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+        } else if (strcasecmp(sprop, "lj-slave") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
+        } else if (strcasecmp(sprop, "lj-master") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+        } else if (strcasecmp(sprop, "rj-master") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
+        } else if (strcasecmp(sprop, "rj-master") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+        } else if (strcasecmp(sprop, "ac97-slave") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_AC97;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
+        } else if (strcasecmp(sprop, "ac97-master") == 0) {
+                machine_data->dai_format = SND_SOC_DAIFMT_AC97;
+                machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
+                machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
+        } else {
+                dev_err(&ofdev->dev,
+                        "unrecognized fsl,mode property \"%s\"\n", sprop);
+                ret = -EINVAL;
+                goto error;
+        }
+
+        if (!machine_data->clk_frequency) {
+                dev_err(&ofdev->dev, "unknown clock frequency\n");
+                ret = -EINVAL;
+                goto error;
+        }
+
+        /* Read the SSI information from the device tree */
+        ret = of_address_to_resource(np, 0, &res);
+        if (ret) {
+                dev_err(&ofdev->dev, "could not obtain SSI address\n");
+                goto error;
+        }
+        if (!res.start) {
+                dev_err(&ofdev->dev, "invalid SSI address\n");
+                goto error;
+        }
+        ssi_info.ssi_phys = res.start;
+
+        machine_data->ssi = ioremap(ssi_info.ssi_phys, sizeof(struct ccsr_ssi));
+        if (!machine_data->ssi) {
+                dev_err(&ofdev->dev, "could not map SSI address %x\n",
+                        ssi_info.ssi_phys);
+                ret = -EINVAL;
+                goto error;
+        }
+        ssi_info.ssi = machine_data->ssi;
+
+
+        /* Get the IRQ of the SSI */
+        machine_data->ssi_irq = irq_of_parse_and_map(np, 0);
+        if (!machine_data->ssi_irq) {
+                dev_err(&ofdev->dev, "could not get SSI IRQ\n");
+                ret = -EINVAL;
+                goto error;
+        }
+        ssi_info.irq = machine_data->ssi_irq;
+
+
+        /* Map the global utilities registers. */
+        guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
+        if (!guts_np) {
+                dev_err(&ofdev->dev, "could not obtain address of GUTS\n");
+                ret = -EINVAL;
+                goto error;
+        }
+        machine_data->guts = of_iomap(guts_np, 0);
+        of_node_put(guts_np);
+        if (!machine_data->guts) {
+                dev_err(&ofdev->dev, "could not map GUTS\n");
+                ret = -EINVAL;
+                goto error;
+        }
+
+        /* Find the DMA channels to use.  For now, we always use the first DMA
+           controller. */
+        for_each_compatible_node(dma_np, NULL, "fsl,mpc8610-dma") {
+                iprop = of_get_property(dma_np, "cell-index", NULL);
+                if (iprop && (*iprop == 0)) {
+                        of_node_put(dma_np);
+                        break;
+                }
+        }
+        if (!dma_np) {
+                dev_err(&ofdev->dev, "could not find DMA node\n");
+                ret = -EINVAL;
+                goto error;
+        }
+        machine_data->dma_id = *iprop;
+
+        /*
+         * Find the DMA channels to use.  For now, we always use DMA channel 0
+         * for playback, and DMA channel 1 for capture.
+         */
+        while ((dma_channel_np = of_get_next_child(dma_np, dma_channel_np))) {
+                iprop = of_get_property(dma_channel_np, "cell-index", NULL);
+                /* Is it DMA channel 0? */
+                if (iprop && (*iprop == 0)) {
+                        /* dma_channel[0] and dma_irq[0] are for playback */
+                        dma_info.dma_channel[0] = of_iomap(dma_channel_np, 0);
+                        dma_info.dma_irq[0] =
+                                irq_of_parse_and_map(dma_channel_np, 0);
+                        machine_data->dma_channel_id[0] = *iprop;
+                        continue;
+                }
+                if (iprop && (*iprop == 1)) {
+                        /* dma_channel[1] and dma_irq[1] are for capture */
+                        dma_info.dma_channel[1] = of_iomap(dma_channel_np, 0);
+                        dma_info.dma_irq[1] =
+                                irq_of_parse_and_map(dma_channel_np, 0);
+                        machine_data->dma_channel_id[1] = *iprop;
+                        continue;
+                }
+        }
+        if (!dma_info.dma_channel[0] || !dma_info.dma_channel[1] ||
+            !dma_info.dma_irq[0] || !dma_info.dma_irq[1]) {
+                dev_err(&ofdev->dev, "could not find DMA channels\n");
+                ret = -EINVAL;
+                goto error;
+        }
+
+        dma_info.ssi_stx_phys = ssi_info.ssi_phys +
+                offsetof(struct ccsr_ssi, stx0);
+        dma_info.ssi_srx_phys = ssi_info.ssi_phys +
+                offsetof(struct ccsr_ssi, srx0);
+
+        /* We have the DMA information, so tell the DMA driver what it is */
+        if (!fsl_dma_configure(&dma_info)) {
+                dev_err(&ofdev->dev, "could not instantiate DMA device\n");
+                ret = -EBUSY;
+                goto error;
+        }
+
+        /*
+         * Initialize our DAI data structure.  We should probably get this
+         * information from the device tree.
+         */
+        machine_data->dai.name = "CS4270";
+        machine_data->dai.stream_name = "CS4270";
+
+        machine_data->dai.cpu_dai = fsl_ssi_create_dai(&ssi_info);
+        machine_data->dai.codec_dai = &cs4270_dai; /* The codec_dai we want */
+        machine_data->dai.ops = &mpc8610_hpcd_ops;
+
+        mpc8610_hpcd_machine.dai_link = &machine_data->dai;
+
+        /* Allocate a new audio platform device structure */
+        sound_device = platform_device_alloc("soc-audio", -1);
+        if (!sound_device) {
+                dev_err(&ofdev->dev, "platform device allocation failed\n");
+                ret = -ENOMEM;
+                goto error;
+        }
+
+        machine_data->sound_devdata.machine = &mpc8610_hpcd_machine;
+        machine_data->sound_devdata.codec_dev = &soc_codec_device_cs4270;
+        machine_data->sound_devdata.platform = &fsl_soc_platform;
+
+        sound_device->dev.platform_data = machine_data;
+
+
+        /* Set the platform device and ASoC device to point to each other */
+        platform_set_drvdata(sound_device, &machine_data->sound_devdata);
+
+        machine_data->sound_devdata.dev = &sound_device->dev;
+
+
+        /* Tell ASoC to probe us.  This will call mpc8610_hpcd_machine.probe(),
+           if it exists. */
+        ret = platform_device_add(sound_device);
+
+        if (ret) {
+                dev_err(&ofdev->dev, "platform device add failed\n");
+                goto error;
+        }
+
+        dev_set_drvdata(&ofdev->dev, sound_device);
+
+        return 0;
+
+error:
+        of_node_put(codec_np);
+        of_node_put(guts_np);
+        of_node_put(dma_np);
+        of_node_put(dma_channel_np);
+
+        if (sound_device)
+                platform_device_unregister(sound_device);
+
+        if (machine_data->dai.cpu_dai)
+                fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
+
+        if (ssi_info.ssi)
+                iounmap(ssi_info.ssi);
+
+        if (ssi_info.irq)
+                irq_dispose_mapping(ssi_info.irq);
+
+        if (dma_info.dma_channel[0])
+                iounmap(dma_info.dma_channel[0]);
+
+        if (dma_info.dma_channel[1])
+                iounmap(dma_info.dma_channel[1]);
+
+        if (dma_info.dma_irq[0])
+                irq_dispose_mapping(dma_info.dma_irq[0]);
+
+        if (dma_info.dma_irq[1])
+                irq_dispose_mapping(dma_info.dma_irq[1]);
+
+        if (machine_data->guts)
+                iounmap(machine_data->guts);
+
+        kfree(machine_data);
+
+        return ret;
+}
+
+/**
+ * mpc8610_hpcd_remove: remove the OF device
+ *
+ * This function is called when the OF device is removed.
+ */
+static int mpc8610_hpcd_remove(struct of_device *ofdev)
+{
+        struct platform_device *sound_device = dev_get_drvdata(&ofdev->dev);
+        struct mpc8610_hpcd_data *machine_data =
+                sound_device->dev.platform_data;
+
+        platform_device_unregister(sound_device);
+
+        if (machine_data->dai.cpu_dai)
+                fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
+
+        if (machine_data->ssi)
+                iounmap(machine_data->ssi);
+
+        if (machine_data->dma[0])
+                iounmap(machine_data->dma[0]);
+
+        if (machine_data->dma[1])
+                iounmap(machine_data->dma[1]);
+
+        if (machine_data->dma_irq[0])
+                irq_dispose_mapping(machine_data->dma_irq[0]);
+
+        if (machine_data->dma_irq[1])
+                irq_dispose_mapping(machine_data->dma_irq[1]);
+
+        if (machine_data->guts)
+                iounmap(machine_data->guts);
+
+        kfree(machine_data);
+        sound_device->dev.platform_data = NULL;
+
+        dev_set_drvdata(&ofdev->dev, NULL);
+
+        return 0;
+}
+
+static struct of_device_id mpc8610_hpcd_match[] = {
+        {
+                .compatible = "fsl,mpc8610-ssi",
+        },
+        {}
+};
+MODULE_DEVICE_TABLE(of, mpc8610_hpcd_match);
+
+static struct of_platform_driver mpc8610_hpcd_of_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "mpc8610_hpcd",
+        .match_table    = mpc8610_hpcd_match,
+        .probe          = mpc8610_hpcd_probe,
+        .remove         = mpc8610_hpcd_remove,
+};
+
+/**
+ * mpc8610_hpcd_init: fabric driver initialization.
+ *
+ * This function is called when this module is loaded.
+ */
+static int __init mpc8610_hpcd_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Freescale MPC8610 HPCD ALSA SoC fabric driver\n");
+
+        ret = of_register_platform_driver(&mpc8610_hpcd_of_driver);
+
+        if (ret)
+                printk(KERN_ERR
+                        "mpc8610-hpcd: failed to register platform driver\n");
+
+        return ret;
+}
+
+/**
+ * mpc8610_hpcd_exit: fabric driver exit
+ *
+ * This function is called when this driver is unloaded.
+ */
+static void __exit mpc8610_hpcd_exit(void)
+{
+        of_unregister_platform_driver(&mpc8610_hpcd_of_driver);
+}
+
+module_init(mpc8610_hpcd_init);
+module_exit(mpc8610_hpcd_exit);
+
+MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
+MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC fabric driver");
+MODULE_LICENSE("GPL");