p1022_ds.c

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#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <asm/fsl_guts.h>

#include "fsl_dma.h"
#include "fsl_ssi.h"
#include "fsl_utils.h"

/* P1022-specific PMUXCR and DMUXCR bit definitions */

#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK    0x0001c000
#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI     0x00018000

#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK   0x00000c00
#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI    0x00000000

#define CCSR_GUTS_DMUXCR_PAD    1   /* DMA controller/channel set to pad */
#define CCSR_GUTS_DMUXCR_SSI    2   /* DMA controller/channel set to SSI */

/*
 * Set the DMACR register in the GUTS
 *
 * The DMACR register determines the source of initiated transfers for each
 * channel on each DMA controller.  Rather than have a bunch of repetitive
 * macros for the bit patterns, we just have a function that calculates
 * them.
 *
 * guts: Pointer to GUTS structure
 * co: The DMA controller (0 or 1)
 * ch: The channel on the DMA controller (0, 1, 2, or 3)
 * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
 */
static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
    unsigned int co, unsigned int ch, unsigned int device)
{
    unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));

    clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
}

/* There's only one global utilities register */
static phys_addr_t guts_phys;

struct machine_data {
    struct snd_soc_dai_link dai[2];
    struct snd_soc_card card;
    unsigned int dai_format;
    unsigned int codec_clk_direction;
    unsigned int cpu_clk_direction;
    unsigned int clk_frequency;
    unsigned int ssi_id;        /* 0 = SSI1, 1 = SSI2, etc */
    unsigned int dma_id[2];     /* 0 = DMA1, 1 = DMA2, etc */
    unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
    char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
};

static int p1022_ds_machine_probe(struct snd_soc_card *card)
{
    struct machine_data *mdata =
        container_of(card, struct machine_data, card);
    struct ccsr_guts __iomem *guts;

    guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
    if (!guts) {
        dev_err(card->dev, "could not map global utilities\n");
        return -ENOMEM;
    }

    /* Enable SSI Tx signal */
    clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
            CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);

    /* Enable SSI Rx signal */
    clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
            CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);

    /* Enable DMA Channel for SSI */
    guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
            CCSR_GUTS_DMUXCR_SSI);

    guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
            CCSR_GUTS_DMUXCR_SSI);

    iounmap(guts);

    return 0;
}

static int p1022_ds_startup(struct snd_pcm_substream *substream)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct machine_data *mdata =
        container_of(rtd->card, struct machine_data, card);
    struct device *dev = rtd->card->dev;
    int ret = 0;

    /* Tell the codec driver what the serial protocol is. */
    ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
    if (ret < 0) {
        dev_err(dev, "could not set codec driver audio format\n");
        return ret;
    }

    /*
     * Tell the codec driver what the MCLK frequency is, and whether it's
     * a slave or master.
     */
    ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
                     mdata->codec_clk_direction);
    if (ret < 0) {
        dev_err(dev, "could not set codec driver clock params\n");
        return ret;
    }

    return 0;
}

static int p1022_ds_machine_remove(struct snd_soc_card *card)
{
    struct machine_data *mdata =
        container_of(card, struct machine_data, card);
    struct ccsr_guts __iomem *guts;

    guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
    if (!guts) {
        dev_err(card->dev, "could not map global utilities\n");
        return -ENOMEM;
    }

    /* Restore the signal routing */
    clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
    clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
    guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
    guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);

    iounmap(guts);

    return 0;
}

static struct snd_soc_ops p1022_ds_ops = {
    .startup = p1022_ds_startup,
};

static int p1022_ds_probe(struct platform_device *pdev)
{
    struct device *dev = pdev->dev.parent;
    /* ssi_pdev is the platform device for the SSI node that probed us */
    struct platform_device *ssi_pdev =
        container_of(dev, struct platform_device, dev);
    struct device_node *np = ssi_pdev->dev.of_node;
    struct device_node *codec_np = NULL;
    struct machine_data *mdata;
    int ret = -ENODEV;
    const char *sprop;
    const u32 *iprop;

    /* Find the codec node for this SSI. */
    codec_np = of_parse_phandle(np, "codec-handle", 0);
    if (!codec_np) {
        dev_err(dev, "could not find codec node\n");
        return -EINVAL;
    }

    mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
    if (!mdata) {
        ret = -ENOMEM;
        goto error_put;
    }

    mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
    mdata->dai[0].ops = &p1022_ds_ops;

    /* ASoC core can match codec with device node */
    mdata->dai[0].codec_of_node = codec_np;

    /* We register two DAIs per SSI, one for playback and the other for
     * capture.  We support codecs that have separate DAIs for both playback
     * and capture.
     */
    memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));

    /* The DAI names from the codec (snd_soc_dai_driver.name) */
    mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
    mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";

    /* Get the device ID */
    iprop = of_get_property(np, "cell-index", NULL);
    if (!iprop) {
        dev_err(&pdev->dev, "cell-index property not found\n");
        ret = -EINVAL;
        goto error;
    }
    mdata->ssi_id = be32_to_cpup(iprop);

    /* Get the serial format and clock direction. */
    sprop = of_get_property(np, "fsl,mode", NULL);
    if (!sprop) {
        dev_err(&pdev->dev, "fsl,mode property not found\n");
        ret = -EINVAL;
        goto error;
    }

    if (strcasecmp(sprop, "i2s-slave") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
        mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
        mdata->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(&pdev->dev, "codec bus-frequency "
                "property is missing or invalid\n");
            ret = -EINVAL;
            goto error;
        }
        mdata->clk_frequency = be32_to_cpup(iprop);
    } else if (strcasecmp(sprop, "i2s-master") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
        mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
    } else if (strcasecmp(sprop, "lj-slave") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
        mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
    } else if (strcasecmp(sprop, "lj-master") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
        mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
    } else if (strcasecmp(sprop, "rj-slave") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
        mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
    } else if (strcasecmp(sprop, "rj-master") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
        mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
    } else if (strcasecmp(sprop, "ac97-slave") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
        mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
    } else if (strcasecmp(sprop, "ac97-master") == 0) {
        mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
        mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
        mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
    } else {
        dev_err(&pdev->dev,
            "unrecognized fsl,mode property '%s'\n", sprop);
        ret = -EINVAL;
        goto error;
    }

    if (!mdata->clk_frequency) {
        dev_err(&pdev->dev, "unknown clock frequency\n");
        ret = -EINVAL;
        goto error;
    }

    /* Find the playback DMA channel to use. */
    mdata->dai[0].platform_name = mdata->platform_name[0];
    ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
                       &mdata->dma_channel_id[0],
                       &mdata->dma_id[0]);
    if (ret) {
        dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
        goto error;
    }

    /* Find the capture DMA channel to use. */
    mdata->dai[1].platform_name = mdata->platform_name[1];
    ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
                       &mdata->dma_channel_id[1],
                       &mdata->dma_id[1]);
    if (ret) {
        dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
        goto error;
    }

    /* Initialize our DAI data structure.  */
    mdata->dai[0].stream_name = "playback";
    mdata->dai[1].stream_name = "capture";
    mdata->dai[0].name = mdata->dai[0].stream_name;
    mdata->dai[1].name = mdata->dai[1].stream_name;

    mdata->card.probe = p1022_ds_machine_probe;
    mdata->card.remove = p1022_ds_machine_remove;
    mdata->card.name = pdev->name; /* The platform driver name */
    mdata->card.owner = THIS_MODULE;
    mdata->card.dev = &pdev->dev;
    mdata->card.num_links = 2;
    mdata->card.dai_link = mdata->dai;

    /* Register with ASoC */
    ret = snd_soc_register_card(&mdata->card);
    if (ret) {
        dev_err(&pdev->dev, "could not register card\n");
        goto error;
    }

    of_node_put(codec_np);

    return 0;

error:
    kfree(mdata);
error_put:
    of_node_put(codec_np);
    return ret;
}

static int __devexit p1022_ds_remove(struct platform_device *pdev)
{
    struct snd_soc_card *card = platform_get_drvdata(pdev);
    struct machine_data *mdata =
        container_of(card, struct machine_data, card);

    snd_soc_unregister_card(card);
    kfree(mdata);

    return 0;
}

static struct platform_driver p1022_ds_driver = {
    .probe = p1022_ds_probe,
    .remove = __devexit_p(p1022_ds_remove),
    .driver = {
        /*
         * The name must match 'compatible' property in the device tree,
         * in lowercase letters.
         */
        .name = "snd-soc-p1022ds",
        .owner = THIS_MODULE,
    },
};

static int __init p1022_ds_init(void)
{
    struct device_node *guts_np;
    struct resource res;

    /* Get the physical address of the global utilities registers */
    guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
    if (of_address_to_resource(guts_np, 0, &res)) {
        pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
        of_node_put(guts_np);
        return -EINVAL;
    }
    guts_phys = res.start;
    of_node_put(guts_np);

    return platform_driver_register(&p1022_ds_driver);
}

static void __exit p1022_ds_exit(void)
{
    platform_driver_unregister(&p1022_ds_driver);
}

module_init(p1022_ds_init);
module_exit(p1022_ds_exit);

MODULE_AUTHOR("Timur Tabi <[email protected]>");
MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
MODULE_LICENSE("GPL v2");